Sound unit and head-mounted sound device

Abstract

The utility model discloses a sound-emitting unit and a head-mounted sound-emitting device. The sound-emitting unit includes a shell component and a bone conduction sound-emitting device and an air conduction sound-emitting device both of which are arranged in the shell component. The shell component includes a contact surface for contacting human skin and a sound outlet for transmitting sound of the air conduction sound-emitting device. The sound-emitting unit has a middle surface perpendicular to its width direction. The center of gravity of the bone conduction sound-emitting device and the center of gravity of the air conduction sound-emitting device are respectively located on both sides of the middle surface. The distance D16 between the center of gravity of the bone conduction sound-emitting device and the middle surface is smaller than the distance D17 between the center of gravity of the air conduction sound-emitting device and the middle surface, which is conducive to making the vibration generated by the bone conduction sound-emitting device when working closer to the middle area of ​​the face cover, and improving the comfort of use.

Description

Technical Field

[0001] The utility model relates to the technical field of sound-generating devices, in particular to a sound-generating unit and a head-mounted sound-generating device. Background Art

[0002] Head-mounted sound-generating devices, such as headphones and smart glasses, all include sound-generating devices that can produce sound. According to the different ways of sound transmission, the sound-generating devices can be divided into bone conduction sound-generating devices and air conduction sound-generating devices.

[0003] A bone conduction device typically consists of a coil and a magnetic circuit assembly. Powering the coil drives the magnetic circuit assembly to vibrate. The device is typically connected to a housing (such as the headphone housing), transmitting the vibrations through the housing to the skin on the face, allowing the user to hear the sound.

[0004] An air-conducted sound-generating device typically includes a diaphragm, a coil connected to the diaphragm, and a magnetic circuit assembly that provides a magnetic field. When the coil is energized, the diaphragm vibrates under the interaction with the magnetic force of the magnetic circuit assembly, thereby stirring the air to produce sound.

[0005] With the development of technology, head-mounted sound equipment has become more mature and complete, but there are still some areas for improvement to meet users' higher demands for head-mounted sound equipment.

[0006] For example, conventional headphones typically only have one bone conduction sound generator or one air conduction sound generator, which can only produce sound through bone conduction or air conduction, resulting in a relatively simple sound generation method. The applicant's research has found that if both bone conduction sound generators and air conduction sound generators are installed in a single sound generation unit, it can help improve the sound generation effect and expand the sound generation methods. However, if the placement of the bone conduction sound generator and the air conduction sound generator is unreasonable, it can easily lead to weak vibration and low sound, resulting in poor listening quality and less comfortable wearing.

[0007] For another example, setting up a bone conduction sound device and an air conduction sound device at the same time may cause the sound unit to be too heavy or too large, affecting the wearing comfort.

[0008] For another example, when a bone conduction sound generator and an air conduction sound generator are set up at the same time, the magnetic fields leaked from the bone conduction sound generator and the air conduction sound generator may have an adverse effect on the operation of each other and external electronic components.

[0009] For example, the setting of the air conduction sound device may cause greater sound leakage when the head-mounted sound device is working.

[0010] For another example, bone conduction sound generating devices and air conduction sound generating devices still need to be improved to increase sensitivity or enhance sound quality.

[0011] In short, there is still room for improvement in many aspects of head-mounted sound devices, such as sound quality (or listening effect, sound effect), wearing comfort, reliability of use and privacy (preventing sound leakage).

[0012] The above content is only used to help understand the technical solution of this application and does not constitute an admission that the above is prior art. Utility Model Content

[0013] The purpose of the present invention is to provide a sound unit and a head-mounted sound device to solve at least one problem in the background technology.

[0014] To achieve the above-mentioned purpose of the utility model, on the one hand, the utility model provides a sound unit, comprising: a housing component, and a bone conduction sound device and an air conduction sound device both disposed within the housing component, wherein the housing component includes a contact surface for contacting human skin and a sound outlet for transmitting sound from the air conduction sound device;

[0015] The sound unit has a mid-plane perpendicular to its width direction, and the center of gravity of the bone conduction sound emitting device and the center of gravity of the air conduction sound emitting device are respectively located on both sides of the mid-plane;

[0016] The distance D16 between the center of gravity of the bone conduction sound generating device and the middle surface is smaller than the distance D17 between the center of gravity of the air conduction sound generating device and the middle surface.

[0017] In a second aspect, the present invention provides a head-mounted sound-generating device, comprising:

[0018] Two sound-producing units as described above;

[0019] Two functional compartments, each compartment being used to accommodate a control circuit board or a battery, and each sound outlet being provided on an end surface of the housing assembly facing the functional compartment;

[0020] An ear hook, suitable for hooking on the ear, wherein the housing assembly and the functional compartment are connected via the ear hook; and

[0021] The rear hanging device is suitable for surrounding the back of the head and is connected between the two functional compartments.

[0022] Compared with the prior art, the present invention has the following beneficial effects: the sound-generating unit includes a bone conduction sound-generating device and an air conduction sound-generating device, and sound can be generated by the bone conduction sound-generating device and the air conduction sound-generating device, thereby improving the listening experience. Furthermore, the sound-generating unit has a midplane perpendicular to its width, with the center of gravity of the bone conduction sound-generating device and the center of gravity of the air conduction sound-generating device located on either side of the midplane, respectively. The distance D16 between the center of gravity of the bone conduction sound-generating device and the midplane is smaller than the distance D17 between the center of gravity of the air conduction sound-generating device and the midplane. Therefore, the vibration generated by the bone conduction sound-generating device during operation is closer to the central area of ​​the faceplate, thereby improving sound transmission efficiency, increasing the volume of bone conduction sound, and providing greater user comfort. Furthermore, the air conduction sound-generating device is relatively farther from the midplane, thereby bringing it closer to the human ear, improving the transmission efficiency of air conduction sound, and thereby increasing the volume of air conduction sound. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of a head-mounted sound-generating device in some embodiments of the present invention.

[0024] Figure 2 It is a schematic diagram of the angle between the side surface of the functional compartment and the contact surface of the sound unit in some embodiments of the present invention.

[0025] Figure 3 It is a schematic diagram of the sound-emitting unit of some embodiments of the present invention.

[0026] Figure 4 1 is a schematic cross-sectional view of a sound unit in some embodiments of the present invention, in which the housing is integral.

[0027] Figure 5 1 is a schematic cross-sectional view of the sound unit of some embodiments of the present invention. In the figure, the shell is split.

[0028] Figure 6 2 is a schematic cross-sectional view of a sound-generating unit in some embodiments of the present invention. In the figure, the sound-generating unit only includes a bone conduction sound-generating device.

[0029] Figure 7 2 is a schematic cross-sectional view of a sound-generating unit in some embodiments of the present invention. In the figure, the sound-generating unit only includes an air-conduction sound-generating device.

[0030] Figure 8 It is a schematic structural diagram of the sound-emitting unit in some embodiments of the present invention.

[0031] Figure 9 yes Figure 8 An exploded view of the sound unit is shown.

[0032] Figure 10a yes Figure 8 A schematic cross-sectional view of the sound unit shown.

[0033] Figure 10b It is a schematic structural diagram of the sound-emitting unit in some embodiments of the present invention.

[0034] Figure 10c 1 is a frequency response graph of sound units with through holes of different total area sizes in some embodiments of the present invention.

[0035] Figure 11a This is a module block diagram of the sound unit in some embodiments of the present invention.

[0036] Figure 11b This is a module block diagram of the sound unit in some embodiments of the present invention.

[0037] Figure 12 1 is a frequency response graph of bone conduction sound generating devices with different low-frequency F0 in some embodiments of the present invention.

[0038] Figure 13 It is a schematic cross-sectional view of the sound-emitting unit of some embodiments of the present invention.

[0039] Figure 14 It is a schematic diagram of the sound-emitting unit of some embodiments of the present invention.

[0040] Figure 15 This is a frequency response curve diagram of some embodiments of the present invention when the sound unit has sound holes of different areas.

[0041] Figure 16 This is a frequency response curve diagram of some embodiments of the present invention when the sound unit has front cavities of different volumes.

[0042] Figure 17 It is a schematic structural diagram of the bone conduction sound generating device of some embodiments of the present invention.

[0043] Figure 18 yes Figure 17 A cross-sectional schematic diagram of the bone conduction sound device shown.

[0044] Figure 19 Schematic diagram of the structure of the bone conduction sound generating device of some embodiments of the present invention. In the figure, the bone conduction support is in the shape of a runway.

[0045] Figure 20 It is a schematic structural diagram of the bone magnetic circuit assembly of some embodiments of the present invention.

[0046] Figure 21 It is a schematic structural diagram of the bone magnetic circuit assembly of some embodiments of the present invention.

[0047] Figure 22It is a schematic structural diagram of the bone magnetic circuit assembly of some embodiments of the present invention.

[0048] Figure 23 It is a schematic structural diagram of the bone magnetic circuit assembly of some embodiments of the present invention.

[0049] Figure 24 The figure is a frequency response graph of the bone conduction sound generating device of some embodiments of the present invention when the bone conduction stents have different thicknesses.

[0050] Figure 25 1 is a magnetic flux leakage curve diagram of the bone conduction sound generating device of some embodiments of the present invention when it has bone conduction brackets of different thicknesses.

[0051] Figure 26 It is along Figure 18 Sectional view obtained by cutting line EE.

[0052] Figure 27 yes Figure 17 A side view of the bone conduction sound device is shown.

[0053] Figure 28 yes Figure 27 A schematic diagram of the external circuit board.

[0054] Figure 29a yes Figure 18 Schematic diagram of the structure of the shrapnel.

[0055] Figure 29b and Figure 29c Both Figure 29a A top view of the shrapnel is shown.

[0056] Figure 30 It is a schematic structural diagram of the spring pieces in some embodiments of the present invention.

[0057] Figure 31 It is a schematic structural diagram of the spring pieces in some embodiments of the present invention.

[0058] Figure 32 1 is a diagram showing the relationship between the low-frequency F0 of the bone conduction sound generating device in some embodiments of the present invention and the mass of the vibrator and the spring coefficient.

[0059] Figure 33a and Figure 33b The applications are Figure 29a The simulation diagrams of the first-order mode and the second-order mode of the bone conduction sound-generating device 2 of the shrapnel are shown.

[0060] Figure 34 yes Figure 29a The stress diagram of the spring when the inner frame is offset by a certain distance is shown.

[0061] Figures 35a to 35dIt is a structural schematic diagram of some embodiments of the present invention in which the spring pieces are provided with hollow holes.

[0062] Figure 36 It is a cross-sectional view of the spring pieces in some embodiments of the present invention.

[0063] Figure 37 It is a cross-sectional view of the springs of some embodiments of the present invention from another perspective.

[0064] Figure 38 This is a schematic diagram of the positions of the springs at both ends of the bone conduction sound generating device in some embodiments of the present invention.

[0065] Figure 39 This is a schematic diagram of the positions of the springs at both ends of the bone conduction sound generating device in some embodiments of the present invention.

[0066] Figure 40 It is a schematic structural diagram of the spring pieces in some embodiments of the present invention.

[0067] Figure 41 The following are frequency response curves of the bone conduction sound generating devices of some embodiments of the present invention when the magnets have different thicknesses.

[0068] Figure 42 It is a schematic cross-sectional view of the bone conduction sound generating device of some embodiments of the present invention.

[0069] Figure 43 It is along Figure 42 Cross-sectional view obtained by cutting line FF.

[0070] Figure 44 The following are frequency response curves of the bone conduction sound generating devices of some embodiments of the present invention when the magnets have chamfers of different sizes.

[0071] Figure 45 yes Figure 18 Enlarged view of part I in the middle.

[0072] Figure 46 It is along Figure 42 Cross-section view obtained by cutting along the LL cutting line.

[0073] Figure 47 yes Figure 17 Schematic diagram of the structure of the mid-bone magnetic circuit component.

[0074] Figure 48 The figure is a graph showing the relationship between the inductance of the bone conduction coil and the number of inductance adjustment holes of the magnetic plate in the bone conduction sound generating device of some embodiments of the present invention.

[0075] Figure 49 yes Figure 17 A top view of the bone conduction sound device is shown.

[0076] Figure 50 It is a cross-sectional view of the bone conduction sound generating device of some embodiments of the present invention.

[0077] Figure 51 The following are frequency response curves of the bone conduction sound generating devices of some embodiments of the present invention when they have bone conduction coils of different heights.

[0078] Figure 52 Schematic diagram of the winding of the bone conduction coil in some embodiments of the present invention.

[0079] Figure 53 This is a schematic diagram of the positions of the bone conduction coil and the bone magnetic circuit assembly in some embodiments of the present invention.

[0080] Figure 54 It is a schematic structural diagram of the air conduction sound generating device of some embodiments of the present invention.

[0081] Figure 55 yes Figure 54 A top view of the air conduction sound generating device is shown.

[0082] Figure 56 It is along Figure 55 Sectional view obtained by cutting along the MM cutting line.

[0083] Figure 57 It is a top view of the magnetic support member of some embodiments of the present invention.

[0084] Figure 58 It is a top view of the magnetic support member of some embodiments of the present invention.

[0085] Figure 59 It is a top view of the magnetic support member of some embodiments of the present invention.

[0086] Figure 60 It is a schematic structural diagram of the air conduction sound generating device of some embodiments of the present invention.

[0087] Figure 61 yes Figure 60 A cross-sectional view of the air conduction sound generating device shown.

[0088] Figure 62 yes Figure 61 Enlarged view of part III.

[0089] Figure 63 yes Figure 60 The diagram shows the positions of the magnetic support, main magnet and main pole core plate of the air conduction sound generating device.

[0090] Figure 64 It is along Figure 56 Sectional view obtained by cutting line JJ.

[0091] Figure 65 It is a schematic diagram of the positions of the magnetic support, auxiliary magnet and auxiliary pole core plate in some embodiments of the present invention.

[0092] Figure 66 This is a schematic diagram of the positions of the magnetic support, auxiliary magnet and auxiliary pole core plate in some embodiments of the present invention.

[0093] Figure 67 This is a schematic diagram of the positions of the magnetic support, auxiliary magnet and auxiliary pole core plate in some embodiments of the present invention.

[0094] Figure 68 yes Figure 56 The schematic diagram of the structure of the air-conducting magnetic circuit component of the air-conducting sound-generating device shown.

[0095] Figure 69 yes Figure 56 Enlarged view of part II.

[0096] Figure 70 This is a schematic diagram of the positions of the main pole core plate and the air conduction coil in one embodiment of the present utility model.

[0097] Figure 71 yes Figure 60 Exploded diagram of the diaphragm assembly.

[0098] Figure 72 yes Figure 54 Schematic diagram of the structure of the diaphragm assembly.

[0099] Figure 73 yes Figure 54 The diagram shows an air conduction sound generating device provided with double-sided tape.

[0100] Figure 74 yes Figure 60 Top view of the center diaphragm assembly.

[0101] Figure 75 yes Figure 72 Top view of the center diaphragm.

[0102] Figure 76 It is along Figure 75 Cross-section view obtained by cutting line KK.

[0103] Figure 77 yes Figure 54 Schematic diagram of the structure of the air conduction stent.

[0104] Figure 78 yes Figure 54 Schematic diagram of the positions of the central air guide bracket, air guide coil and magnetic support.

[0105] Figure 79yes Figure 54 Schematic diagram of the wiring of the lead wires of the mid-air guide coil.

[0106] Figure 80 This is a schematic diagram of the connection between the control circuit board and the bone conduction coil and the air conduction coil in some embodiments of the present invention.

[0107] Figure 81 This is a schematic diagram of the connection between the control circuit board and the bone conduction coil and the air conduction coil in some embodiments of the present invention.

[0108] Figure 82 This is a schematic diagram of the position of the adapter circuit board in some embodiments of the present invention. In the figure, the adapter circuit board is located on one side of the bone conduction sound device.

[0109] Figure 83 This is a schematic diagram of the position of the adapter circuit board in some embodiments of the present invention. In the figure, the adapter circuit board is located below the bone conduction sound device. DETAILED DESCRIPTION

[0110] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It will be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some, rather than all, structures related to the present application are shown in the accompanying drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0111] As used herein, the terms "comprise," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0112] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0113] The embodiments of this specification describe a head-mounted sound-emitting device that can be worn on a human head and enables a person to hear sound, for example, by bone conduction and / or air conduction. The head-mounted sound-emitting device includes a sound-emitting unit 10 and a wearing mechanism 11 connected to the sound-emitting unit 10. The sound-emitting unit 10 is used to emit sound, and the wearing mechanism 11 is used to wear the sound-emitting unit 10 on a human head so that the sound can be easily heard by a person. Exemplarily, the sound-emitting unit 10 is worn to a position corresponding to a human ear, for example, directly inserted into the ear or located near the front of the ear.

[0114] In some embodiments, the wearing mechanism 11 may be in the shape of a ring with an opening (e.g., a U-shape), which is mounted on the top of the user's head to achieve wearing. In some embodiments, the wearing mechanism 11 may include an ear hook, which is curved and can be hung above the user's ear. In some embodiments, the wearing mechanism 11 may include a curved back hook and an ear hook suitable for hooking above the human ear, and the back hook is suitable for wrapping around the back of the human head. In some embodiments, the wearing mechanism 11 may also be a frame structure, which includes temples located on both sides of the head, and the sound-emitting unit 10 may be connected to the temples.

[0115] In some embodiments, the head-mounted sound-emitting device includes a sound-emitting unit 10, which is worn on the left or right ear of a person. For example, when the head-mounted sound-emitting device is a single-ear headset, it only includes one sound-emitting unit 10, and may also have an ear hook that is hooked on the ear. In other embodiments, the head-mounted sound-emitting device includes two sound-emitting units 10, which are respectively worn on the left and right ears of a person. For example, the head-mounted sound-emitting device can be a binaural headset or glasses, etc., in which case it includes two sound-emitting units. Depending on the product, the head-mounted sound-emitting device may also include a back hook and ear hook or a glasses frame.

[0116] The following description uses a binaural headset as an example.

[0117] like Figure 1 As shown, Figure 1The head-mounted sound device shown in the figure is a binaural headset, which includes two sound units 10 (or earphone heads), and also includes a back hanger 110 suitable for wrapping around the back of the head, two ear hangers 111 suitable for hooking on the ears, and two functional compartments, the functional compartments being used to accommodate a control circuit board and / or a battery. 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. For another example, each functional compartment accommodates a control circuit board and / or a battery. The back hanger 110 is connected between the two functional compartments, and the two sound units 10 are respectively arranged corresponding to the two functional compartments. The sound units 10 and the corresponding functional compartments are connected via ear hangers 111. Specifically, the back hanger 110 is connected between the control compartment 112 and the battery compartment 113. The control compartment 112 and one of the sound units 10, as well as the battery compartment 113 and the other sound unit 10, are both connected via an ear hanger 111.

[0118] It is understandable that although this specification introduces binaural headphones as an example, the head-mounted sound device is not limited to binaural headphones. For example, it can also be hearing aids, audio glasses, smart helmets, VR devices, AR devices and other electronic devices.

[0119] The head-mounted sound device is symmetrical as a whole to improve wearing comfort. Figure 1 and Figure 2 As shown, the functional compartment has a side surface 1123 facing the human body when the head-mounted sound-emitting device is worn, and the sound-emitting unit 10 has a contact surface 10010 in contact with the human skin when the head-mounted sound-emitting device is worn. The angle β1 formed between the side surface 1123 and the contact surface 10010 toward the side where the head is located is an obtuse angle, so that the contact surface 10010 is deflected toward the side where the head is located relative to the side surface 1123 by a certain angle. Optionally, the angle β1 ranges from 160° to 170°. When the head-mounted sound-emitting device is worn on the human head, since the contact surface 10010 is deflected toward the face, the ear hook 111 and the functional compartment will be deflected to a certain extent toward the side away from the head after wearing, which is conducive to forming a certain gap between the ear hook 111 and the skin of the head. The gap forms a space for placing the temples of the glasses, so that when the user wears glasses, the temples of the glasses and the ear hooks of the headphones, especially the bent parts, do not interfere or interfere less, making it more convenient to wear glasses and headphones at the same time, thereby enhancing the stability of wearing glasses. In addition, the functional compartment can press against the back of the external ear, and the sound unit 10 deflects toward the side of the head, sticking closer to the facial skin, ensuring the stability of the earphones. When the angle β1 is in the range of 160° to 170°, it can also prevent the sound unit 10 from being excessively deflected, causing it to be difficult or uncomfortable to wear.

[0120] Further optionally, the lower end 10010a of the contact surface 10010 is farther from the side surface 1123 than the upper end 10010b thereof, that is, the sound unit 10 is deflected upward as a whole, so that the contact surface 10010 fits more closely to the facial skin, which is beneficial to improving the sound transmission effect and can better ensure the formation of a gap to accommodate the temples.

[0121] It should be noted that when defining the angle between two surfaces in this article, the surface may be a plane or a curved surface. When the surface is a plane, the angle with the surface is the angle with the plane on which the surface is located. When the surface is a curved surface, the angle with the plane is the angle with the plane on which the surface is located. Figure 3 The most convex or concave point of the arc surface has a tangent plane 10011. In this case, the angle with the surface can be understood as the angle with the tangent plane 10011. For example, when the contact surface 10010 and the side surface 1123 are both planes, the angle β1 is the angle between the two planes. When the contact surface 10010 and the side surface 1123 are arc surfaces, the angle β1 is the angle between the tangent plane of the contact surface 10010 and the tangent plane of the side surface 1123.

[0122] Next, the sound unit of the head-mounted sound device is described with examples.

[0123] The sound 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, for example, Figure 4 As shown, the housing assembly 100 includes a housing 1000 with an open end and a face cover 1001 that seals the open end of the housing 1000. The housing 1000 is integrally formed. The face cover 1001 contacts the facial skin when worn. Optionally, a soft layer (not shown) is provided on the outside of the face cover 1001 to improve the comfort when in contact with the face. The material of the soft layer can be, for example, silicone. In other embodiments, such as Figure 5 As shown, the housing 1000 is formed by connecting two parts, which includes a side shell portion 1004 and a back cover 1002. The face cover 1001 and the back cover 1002 are arranged opposite to each other, and the two respectively seal the two open ends of the side shell portion 1004. Optionally, the side shell portion 1004 is tubular. The side shell portion 1004 is not limited to a single part. For example, it can be connected into a tubular shape by two or more parts. It is understandable that when the housing 1000 is integrally formed, the back cover 1002 and the side shell portion 1004 are integral. The housing 1000 is not limited to having only one opening. In other embodiments, the housing 1000 can also be provided with two or more openings. For example, the side shell portion 1004 can be provided with a notch and sealed by a cover or other components.

[0124] The sound unit 10 is connected to the ear hook 111 through its housing assembly 100 . For example, the ear hook 111 can be connected to the side shell portion 1004 .

[0125] The sound-generating device is used to convert electrical signals into mechanical vibrations. For example, the sound-generating device can be a bone conduction sound-generating device, which converts electrical signals into mechanical vibrations and transmits the mechanical vibrations directly to the human skin through the face cover 1001, which is in contact with the facial skin, allowing the user to hear the sound through bone conduction. The sound-generating device can also be an air conduction sound-generating device, in which case the mechanical vibrations agitate the air to vibrate, thereby generating air-conducted sound. It will be understood that the housing assembly 100 is not limited to being installed with only one or one type of sound-generating device.

[0126] In some embodiments, reference Figure 6 The sound unit 10 is a bone conduction sound unit, in which only the bone conduction sound device 2 is provided, and the air conduction sound device 3 is not provided. Optionally, the bone conduction sound device 2 is connected to the face cover 1001 and / or the back cover 1002. In some embodiments, reference Figure 7 , the sound unit 10 is an air conduction sound unit, in which only the air conduction sound device 3 is provided, and the bone conduction sound device 2 is not provided. In some embodiments, Figure 4 and Figure 5 As shown, the sound unit 10 can simultaneously transmit sound by bone conduction and air conduction. At this time, a bone conduction sound device 2 and an air conduction sound device 3 are simultaneously provided therein. Optionally, the bone conduction sound device 2 is connected to the face cover 1001 and / or the back cover 1002.

[0127] It is understandable that when the sound-emitting unit 10 has independently set bone conduction sound-emitting devices 2 and air conduction sound-emitting devices 3, it is possible to selectively use the bone conduction sound-emitting devices 2 and air conduction sound-emitting devices 3 to emit sound, thereby increasing the diversity of the sound-emitting methods. In addition, the sound-emitting characteristics of the bone conduction sound-emitting devices 2 and air conduction sound-emitting devices 3 can be used to give full play to the performance advantages of the combination of bone conduction and air conduction, and avoid their disadvantages. For example, the frequency band with the largest vibration of the bone conduction vibration part is filtered out to reduce numbness, while the bass of the low-frequency part of the air conduction is used to improve the sensitivity of the low frequency. Of course, the above example is only one aspect. Those skilled in the art can make full use of the combined method to improve the sound quality in a variety of ways, improve the shortcomings of using a single sound-emitting unit independently, and thus improve the listening effect. The following is an example of a sound-emitting unit with two sound-emitting devices. It is understandable that the bone conduction sound-emitting device 2 and air conduction sound-emitting device 3 described below can also be applied separately to the sound-emitting unit 10.

[0128] like Figure 1As shown, in some embodiments, the overall mass of the headset (i.e., the mass of the entire device) ranges from 22g to 40g. If the headset is too heavy, wearing it for a long time may cause discomfort to the head and neck, and even cause headaches or neck fatigue. If the headset is too light, it may not be stable enough and may easily move or shake during use, affecting the listening experience. Limiting the overall mass to 22g to 40g is conducive to achieving a balance between comfort and stability to ensure a good user experience. The overall mass of the headset can be further optionally set to 26g to 35g, and further optionally to 28 to 33g, to further ensure the wearing experience.

[0129] Furthermore, the ratio of the mass of a single sound unit 10 to the total mass of the headset is 0.13 to 0.27, ensuring that the sound unit 10 has a relatively appropriate mass and evenly distributes the weight of the headset, thereby improving wearing comfort and stability. Optionally, the mass of a single sound unit 10 is 4 to 7 grams, and more preferably 5 to 6 grams, ensuring that the mass of the sound unit 10 is more appropriate and facilitates the distribution of the mass of the bone conduction sound device 2 and the air conduction sound device 3.

[0130] In some embodiments, the ratio of the total mass of the two sound units 10 to the total mass of the two functional compartments (the control compartment 112 and the battery compartment 113) and the back hanger 110 is 0.7 to 1.3. In this way, the mass of the two sound units 10 is closer to the total mass of the functional compartments and the back hanger 110, making the mass in front of and behind the ear more balanced and consistent, thereby improving wearing comfort and stability. The stable wearing of the sound units 10 reduces energy leakage during vibration transmission, especially energy leakage in the low-frequency band, so that the vibration can be more effectively transmitted to the skull, thereby enhancing low-frequency perception. Further optionally, the ratio of the total mass of the two sound units 10 to the total mass of the two functional compartments and the back hanger 110 is 0.8 to 1.2, so as to further balance the mass in front of and behind the ear, which is beneficial for reducing the impact of the swing of the back hanger on the wearing stability when wearing the headphones and exercising, thereby effectively reducing the displacement of the headphones caused by unstable wearing, keeping the sound units 10 in the optimal position, reducing sound distortion and reflection, and improving audio clarity and the sense of positioning of the sound field.

[0131] Figures 8 to 10aThis is a schematic diagram of the structure of a sound-emitting unit 10 according to some embodiments of the present specification. The sound-emitting unit 10 includes a housing assembly 100, and a bone conduction sound-emitting device 2 and an air conduction sound-emitting device 3, both of which are disposed within the housing assembly 100. The bone conduction sound-emitting device 2 is connected to a face cover 1001, and its vibrations are transmitted to the human body through the face cover 1001. The air conduction sound-emitting device 3 is disposed on one side of the bone conduction sound-emitting device 2. In other embodiments, the bone conduction sound-emitting device 2 may also be connected to a back cover 1002, or to both the face cover 1001 and the back cover 1002, transmitting vibrations to the face cover 1001 through the housing 1000, and then transmitting vibrations to the human body through the face cover 1001. The housing assembly 100 is provided with a sound outlet 1003 connecting the interior and exterior. The air conduction sound-emitting device 3 emits sound outward through the sound outlet 1003. The air conduction sound-emitting device 3 has a diaphragm 321 for vibrating and producing sound. Optionally, the diaphragm 321 is disposed opposite the sound outlet 1003. Since the bone conduction sound generating device 2 and the air conduction sound generating device 3 are provided at the same time, bone conduction sound transmission and air conduction sound transmission can be realized at the same time to increase the volume, and the respective advantageous frequency bands can be utilized to achieve a better auditory effect.

[0132] In some embodiments, the air conduction sound device 3 is located on one side of the bone conduction sound device 2 in the width direction, and the air conduction sound device 3 and the bone conduction sound device 2 are arranged along the width direction Y of the sound unit 10. This makes the arrangement of the air conduction sound device 3 and the bone conduction sound device 2 more reasonable and compact, saves space, optimizes weight distribution, and helps to control the mass and volume of the sound unit 10 within a small range. The sound unit 10 can have a suitable shape and volume, not being too long and uncomfortable to wear, and facilitates the air conduction sound device 3 to be close to the ear for sound transmission. At the same time, when worn, the bone conduction sound device 2 is located away from the ear. When the angle β1 formed between the side surface 1123 and the contact surface 10010 toward the head is 160° to 170°, the portion of the housing assembly 100 corresponding to the bone conduction sound device 2 is deflected toward the face, which can better fit the face, thereby improving the sound transmission efficiency of the bone conduction sound device 2. The length direction X, width direction Y and thickness (or height) direction Z of the sound unit 10 can be referred to Figure 8 In the XYZ coordinate system, the thickness direction is perpendicular to the contact surface 10010. It can be understood that the length, width and thickness directions of the housing component 100 are consistent with the length, width and thickness directions of the sound unit 10.

[0133] like Figure 10a As shown, the sound unit 10 has a middle surface 10a perpendicular to the width direction Y. The middle surface 10a can be determined as follows: the sound unit 10 is cut through a cutting plane perpendicular to the length direction X of the sound unit 10 to obtain a cross section (e.g. Figure 10aThe cross-section shown in FIG. 1 is a plane passing through the central axis of the bone conduction sound-generating device 2. A section line 10b perpendicular to the thickness direction Z of the sound-generating unit 10 is drawn at a point halfway along the thickness direction Z of the cross-section. The midplane 10a is a plane passing through the midpoint of section line 10b and perpendicular to section line 10b. The center of gravity O4 of the bone conduction sound-generating device 2 and the center of gravity O5 of the air conduction sound-generating device 3 are located on either side of midplane 10a, respectively, to achieve a more balanced distribution of their centers of gravity. This facilitates the combined center of gravity of the two devices being closer to midplane 10a, thereby bringing the center of gravity of the entire sound-generating unit 10 closer to midplane 10a. This ensures a more centered center of gravity for the sound-generating unit 10, ensuring proper balance when the device is worn and avoiding discomfort or instability caused by a shift in the center of gravity.

[0134] When the sound-generating device (including the bone conduction sound-generating device 2 and the air conduction sound-generating device 3) is symmetrical as a whole (for example, centrally symmetrical and / or axially symmetrical) or approximately symmetrical, the center of gravity of the sound-generating device can be understood as being located at the geometric center of the sound-generating device, or as being located at the midpoint of the length, width, and height / thickness directions of the sound-generating device.

[0135] In some embodiments, the distance D16 between the center of gravity O4 of the bone conduction sound device 2 and the mid-surface 10a is smaller than the distance D17 between the center of gravity O5 of the air conduction sound device 3 and the mid-surface 10a. This facilitates the vibration of the bone conduction sound device 2 being closer to the central area of ​​the face cover 1001, thereby improving user comfort. Furthermore, the central area generally adheres more closely to the facial skin, which helps improve sound transmission efficiency, thereby increasing the loudness and volume of the bone-conducted sound and transmitting more sound details, thereby improving sound quality. Furthermore, the air conduction sound device 3 is further away from the mid-surface 10a, which facilitates its proximity to the ear canal. It is understood that the closer the air conduction sound device 3 is to the ear canal, that is, the closer the sound source is to the eardrum, the more significantly the air conduction sound transmission efficiency can be improved, reducing the energy loss of sound waves in the atmosphere, thereby increasing the sound pressure level and volume of the air conduction sound. In particular, this can enhance the overall listening detail, allowing the ear to hear richer sound elements. Combined with the solid-state sound transmission characteristics of the bone conduction sound unit, the air conduction and bone conduction interact to simultaneously transmit sound to the auditory nerve in the brain, significantly improving the overall sound quality and detail of the headphones, making the sound closer to the quality of the sound source, with lower distortion and better sound reproduction. Furthermore, the greater mass of the bone conduction sound device 2 than the air conduction sound device 3 facilitates the combined center of gravity of the two being closer to the mid-surface 10a.

[0136] Further optionally, the ratio of the mass of the bone conduction sound emitting device 2 to the mass of the air conduction sound emitting device 3 is 2 to 6, and the ratio of the distance D17 to the distance D16 is 2 to 6. It can be understood that the bone conduction sound emitting device 2 mainly transmits sound through vibration, and the vibration generated by it is an effective vibration. The air conduction sound emitting device 3 mainly transmits sound through air, and the vibration transmitted to the human skin is an invalid vibration. The greater the mass ratio, the greater the ratio of the distance D17 to the distance D16 can be. In this way, the distance between the center of gravity of the bone conduction sound emitting device 2 and the middle surface 10a is shorter, which is conducive to sound transmission through the middle area of ​​the face cover 1001, improving the sound effect, and reducing Because the bone conduction sound device 2 is offset to one side of the face cover 1001, which causes the vibration to feel uncomfortable, and at the same time, the air conduction sound device 3 is offset relative to the middle area of ​​the face cover 1001, the vibration transmitted by the air conduction sound device 3 to the human skin increases due to the longer transmission path, thereby reducing the vibration generated by the vibration of the air conduction sound device 3 and further improving the user experience. However, if the mass ratio is too large, the sound effect of the air conduction sound device 3 may be affected due to the reduction in mass of the air conduction sound device 3, and the mass and volume of the sound unit 10 may be increased due to the increase in mass and volume of the bone conduction sound device 2, thereby affecting the wearing experience. Furthermore, a mass ratio that is too small is also detrimental to improving overall performance. For example, in one scenario, the mass of the bone conduction sound device 2 remains unchanged, while the mass of the air conduction sound device 3 needs to be increased. Because the density of the air conduction sound device 3 is relatively low, this means that the volume of the air conduction sound device 3 will increase significantly, resulting in a simultaneous increase in the volume of the sound unit 10, which will increase the weight of the earphone head, significantly increasing the sense of weight when the user wears it. At the same time, due to the increase in the system's vibrating mass, the sound pressure level in the high-frequency band will be significantly attenuated, the volume will be reduced in the high-frequency band, and many sound details will be lost, resulting in a poor overall subjective and objective listening experience, thus affecting the user experience. In another scenario, the mass of the air conduction sound device 3 remains unchanged, while the mass of the bone conduction sound device 2 needs to be reduced. Because the product density of the bone conduction sound device 2 is relatively high, this requires reducing the volume of the bone conduction sound device 2. Generally, the volume of the bone conduction sound device 2 is directly proportional to its performance: the smaller the volume, the worse the performance, and conversely, the larger the volume, the better the performance. The main reason is that when the volume is larger, one approach, for example, is to make the magnetic circuit assembly larger. The larger the magnetic circuit assembly, the greater its driving force, and the sound pressure level across the entire frequency band will be significantly improved, ultimately reflecting improved performance. Of course, the above-mentioned approach is only one example. Those skilled in the art can improve performance by increasing the coupling space between the voice coil and the magnetic circuit, adopting a more stable spring design to prevent rolling vibration, increasing the number of turns and length of the voice coil, etc., while the opposite will produce the opposite effect. Therefore, setting the ratio of the mass of the bone conduction sound-generating device 2 to the mass of the air conduction sound-generating device 3 to 2-6, and the ratio of the distance D17 to the distance D16 to 2-6, can enable the sound-generating unit 10 to achieve a better overall sound effect.

[0137] Further optionally, the ratio of the distance D17 to the distance D16 is M, the ratio of the mass of the bone conduction sound emitting device 2 to the mass of the air conduction sound emitting device 3 is N, and the ratio of M to N is 0.7 to 1.3, so as to ensure that the combined center of gravity of the bone conduction sound emitting device 2 and the air conduction sound emitting device 3 can be close to the middle surface 10a or located on the middle surface 10a, closer to the middle surface 10a, and further ensure the sound effect and user experience.

[0138] Optionally, the air conduction sound emitting device 3 is entirely located on one side of the middle surface 10a, and the bone conduction sound emitting device 2 passes through the middle surface 10a and is divided by the middle surface 10a into two parts located on both sides of the middle surface 10a.

[0139] The air conduction sound device 3 and the bone conduction sound device 2 are elongated, with their length greater than their width. For example, the cross-sectional profile of the air conduction sound device 3 and the bone conduction sound device 2 is rectangular (the corners of which may be rounded, right-angled, chamfered, or other transitional shapes between the long and short sides, such as curves), or a runway shape. Optionally, the bone conduction sound device 2 is arranged along the length of the sound unit 10 (for example, the length of the bone conduction sound device 2 may be aligned with the projection of the length of the sound unit 10 on the XY plane, or the two may form an angle of no more than 30°), thereby increasing the volume of the bone conduction sound device 2, increasing its sound pressure level, reducing distortion, and improving its sound effect. Further optionally, the bone conduction sound device 2 is aligned along the length of the sound unit 10. Further optionally, the housing assembly 100 has a generally rectangular cavity, so that it is smaller in size while achieving the desired performance and has higher internal space utilization. Further optionally, the bone conduction sound-generating device 2 and the air conduction sound-generating device 3 are in the shape of a rectangular parallelepiped as a whole, and the outer contour of their cross-section is roughly rectangular, so as to make more effective use of 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 minimized while meeting the performance requirements. In this way, the overall appearance and volume of the earphone head are ergonomic, and it is convenient to install the bone conduction sound-generating device 2 and the air conduction sound-generating device 3 in the earphone head.

[0140] Optionally, the length-to-width ratio of the bone conduction sound-generating device 2 is 1.3 to 3, which allows the sound-generating unit 10 to have sufficient vibration transmission area and space along its length. An appropriately longer length can fully utilize the space within the earphone head to improve acoustic performance. For example, as the length increases, the volume also increases. In this case, the sensitivity can be increased by increasing the volume of the magnetic circuit assembly, or the F0 of the bone conduction sound-generating device 2 can be reduced by increasing the length of the elastic arm of the shrapnel. Those skilled in the art can flexibly make corresponding technical adjustments based on specific product requirements, including but not limited to the above methods. When the length-to-width ratio is too small, the volume of the bone conduction sound-generating device 2 decreases. As mentioned above, the volume and performance of the bone conduction sound-generating device 2 are positively correlated; the smaller the volume, the worse the performance. Therefore, it is necessary to set a lower limit to ensure the performance of the bone conduction sound-generating device 2. Furthermore, an overly narrow design may result in uneven vibration patterns, leading to unstable vibration, rolling vibration, or increased distortion. Consequently, the magnetic circuit components may collide with the coil during vibration, causing noise, or the large swing amplitude may cause significant distortion, resulting in poor sound reproduction and affecting the accuracy and clarity of the sound quality. Furthermore, an excessively long aspect ratio may weaken the structural stability of the bone conduction sound generator 2, thereby affecting the durability and reliability of the device. Setting the aspect ratio to 1.3 to 3 helps balance the aspect ratio of the bone conduction sound generator 2, ensuring good structural stability, vibration transmission efficiency, and sound quality while providing good acoustic performance. Furthermore, the length-to-width ratio of the bone conduction sound generator 2 is set to 1.6 to 2 to further balance the aspect ratio and ensure the sound quality and effect of the output sound.

[0141] Optionally, the ratio of the length to the width of the air conduction sound device 3 is 1.3 to 3, and the air conduction sound device 3 is arranged along the length direction of the sound unit 10 (for example, the length direction of the air conduction sound device 3 can be consistent with the projection of the length direction of the sound unit 10 on the XY plane, or the two form an angle of no more than 30°), which is conducive to making full use of the space in the length direction of the air conduction sound device 3 and increasing the effective radiation area of ​​the diaphragm 321. However, if the aspect ratio is too large, similar to the aspect ratio of the bone conduction sound device 2, the diaphragm 321 of the air conduction sound device 3 is prone to swing when vibrating, resulting in distorted sound quality or the air conduction coil touching the air conduction magnetic circuit component to cause noise, etc. Similarly, similar to the aspect ratio of the bone conduction sound device 2, it is necessary to set a lower limit, and the aspect ratio of the air conduction sound device 3 cannot be too small to ensure the performance of the air conduction sound device 3. Setting the aspect ratio to 1.3 to 3 is beneficial for fully utilizing the space while having good structural stability, vibration transmission efficiency and sound quality. Furthermore, the ratio of the length to the width of the air conduction sound emitting device 3 is 1.6 to 2 to further balance the aspect ratio and ensure its good structure and acoustic output effect. The bone conduction sound emitting device 2 and the air conduction sound emitting device 3 are arranged in a long strip shape, and the air conduction sound emitting device 3 is arranged to be located on one side of the width direction of the bone conduction sound emitting device 2, which is beneficial for making the structural arrangement more compact, thereby fully utilizing the internal space of the housing assembly 100 and increasing the vibration transmission area of ​​the bone conduction sound emitting device 2. For example, Figure 8 In the illustrated embodiment, if the bone conduction sound-generating device 2 is configured as a cylinder, while maintaining the internal space of the housing assembly 100, its volume will be smaller than if it were configured as a strip. It will be appreciated that when the bone conduction sound-generating device 2 and the air conduction sound-generating device 3 are configured as a cuboid or a nearly cuboid shape, better space utilization can be achieved. In other embodiments, both or one of the bone conduction sound-generating device 2 and the air conduction sound-generating device 3 may be configured as a cylinder. In other embodiments, the bone conduction sound-generating device 2 and / or the air conduction sound-generating device 3 may also be in the shape of a polygonal prism.

[0142] Unless otherwise specified, this specification uses rectangular parallelepiped-shaped bone conduction sound generator 2 and air conduction sound generator 3 as examples. It should be understood that the use of rectangular parallelepiped shapes as examples does not necessarily mean that the bone conduction sound generator 2 and air conduction sound generator 3 must be rectangular parallelepiped-shaped. Their cross-sectional profiles can also be runway-shaped, cylindrical, elliptical, or polygonal.

[0143] Next, the sound generation modes of the bone conduction sound generating device 2 and the air conduction sound generating device 3 are described with examples.

[0144] Since the bone conduction sound generating device 2 and the air conduction sound generating device 3 are provided at the same time, the acoustic characteristics of both can be fully utilized, used in combination and their respective advantages can be reasonably utilized to achieve a better sounding effect. Moreover, compared with simple bone conduction sounding and air conduction sounding, the sounding mode can also be more diversified.

[0145] In some embodiments, the bone conduction sound emitting device 2 and the air conduction sound emitting device 3 work simultaneously in the entire sound frequency band. In this way, the control circuits of the bone conduction sound emitting device 2 and the air conduction sound emitting device 3 can be simplified, and electronic components can be reduced. For example, no additional frequency divider circuit is required, which can reduce the complexity and cost of design and manufacturing. In addition, the way of making sounds in the entire frequency band at the same time 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 pointed out that the sound emitting device works in a certain frequency band, which means that it can make sounds normally in this frequency band without gain attenuation or with a small attenuation (for example, attenuation within 10dB). The sound emitting device does not work in a certain frequency band, which means that it does not make sounds in this frequency band or the sound volume is greatly attenuated, for example, attenuation is above 18dB. It can be understood that in this embodiment, the bone conduction sound emitting device 2 and the air conduction sound emitting device 3 can be connected to the same circuit, such as Figure 11a As shown, Figure 11a A block diagram of a head-mounted sound device according to an embodiment is shown. The head-mounted sound device includes a control chip 1120 and a first power amplifier 1121 (a power amplifier is short for power amplifier). First power amplifier 1121 is electrically connected between control chip 1120 and the bone conduction sound device 2 and the air conduction sound device 3. It amplifies signals from control chip 1120 to drive the bone conduction sound device 2 and the air conduction sound device 3. In this embodiment, the bone conduction sound device 2 and the air conduction sound device 3 can only be controlled to produce sound simultaneously.

[0146] In some embodiments, the bone conduction sounding device 2 and the air conduction sounding device 3 can be independently controlled to operate, so that within a certain frequency band, the bone conduction sounding device 2 or the air conduction sounding device 3 can be selectively used to produce sound, or both can produce sound simultaneously. For example, within a certain frequency band, the bone conduction sounding device 2 can produce sound while the air conduction sounding device 3 does not produce sound, or the bone conduction sounding device 2 does not produce sound while the air conduction sounding device 3 produces sound, or the bone conduction sounding device 2 and the air conduction sounding device 3 can produce sound simultaneously. In this way, the respective characteristics and advantages of the bone conduction sounding device 2 and the air conduction sounding device 3 can be fully utilized, thereby improving the overall sound quality of the sounding unit 10. Moreover, since different signals can be input into the bone conduction sounding device 2 and the air conduction sounding device 3, the bone conduction sounding device 2 and the air conduction sounding device 3 can also produce different sounds, thereby diversifying the sound effects.

[0147] In this application, the distinction standards of each frequency band are as follows: low frequency band is 20~250Hz, mid-low frequency is 250Hz~500Hz, mid frequency band is 500~2000Hz, mid-high frequency is 2000~5000Hz, and high frequency band is 5000~20000Hz.

[0148] The frequency response curves of the bone conduction sound generating device 2 and the air conduction sound generating device 3 both have a low-frequency resonance point (F0), which can be simply referred to as the low-frequency resonance frequency or low-frequency F0 or F0. At the low-frequency resonance point, a resonance peak appears in the frequency response curve.

[0149] In some embodiments, the bone conduction sound emitting device 2 and the air conduction sound emitting device 3 have their own operating frequency bands, and at least part of their operating frequency bands are different. In some embodiments, the operating frequency bands of the bone conduction sound emitting device 2 and the air conduction sound emitting device 3 are independent and have essentially no overlap. The operating frequency bands of the two have a crossover point, with the air conduction sound emitting device 3 operating in a frequency band below the crossover point and the bone conduction sound emitting device 2 operating in a frequency band above the crossover point. The crossover point can be, for example, between 150Hz and 400Hz (that is, the crossover point can select a frequency within the range of 150Hz to 400Hz); for another example, the crossover point can be between 170Hz and 300Hz; for another example, the crossover point can be any value among 170Hz, 180Hz, 190Hz, 200Hz, 220Hz, 250Hz, and 300Hz. The frequency of the crossover point is greater than the low frequency F0 of the bone conduction sound emitting device 2. The bone conduction sound device 2 produces a strong vibration near the low frequency F0, which is reflected in the user as an excessive numbness, affecting the user's comfort. Some users may not be able to tolerate this numbness. Setting the crossover point after the low frequency F0 allows the air conduction sound device 3 to mainly produce sound in the low frequency band below the crossover point, while the bone conduction sound device 2 does not produce sound near the low frequency F0 or reduces the sound energy. This can not only ensure the low-frequency sensitivity and sound quality (this part is mainly contributed by the air conduction sound device 3), but also effectively improve the numbness of the bone conduction sound device 2 (because it avoids the frequency band near F0 with the largest vibration amplitude). At the same time, it can improve the sound reproduction, significantly improve the sound quality, and thus improve the user's comfort. Optionally, the difference between the two is not less than 20Hz to better reduce the vibration sensation of the low frequency F0.

[0150] In some embodiments, the operating frequency bands of the bone conduction sounding device 2 and the air conduction sounding device 3 overlap, and the operating frequency band of the bone conduction sounding device 2 is generally greater than the operating frequency band of the air conduction sounding device 3. For example, the operating frequency band of the bone conduction sounding device 2 is greater than or equal to 300 Hz, and the operating frequency band of the air conduction sounding device 3 is less than or equal to 400 Hz. For another example, the operating frequency band of the bone conduction sounding device 2 is greater than or equal to 500 Hz, and the operating frequency band of the air conduction sounding device 3 is less than or equal to 800 Hz. For another example, the operating frequency band of the bone conduction sounding device 2 is greater than or equal to 800 Hz, and the operating frequency band of the air conduction sounding device 3 is less than or equal to 1000 Hz. Since the two have overlapping frequency bands, the transition is more natural when the two switch between working. Optionally, the range of the overlapping frequency band of the operating frequency band of the bone conduction sounding device 2 and the operating frequency band of the air conduction sounding device 2 is greater than or equal to 100 Hz to ensure the naturalness of the transition. Further optionally, the working frequency band of the bone conduction sound generating device 2 is greater than its low frequency F0, and the minimum value of the difference between the working frequency band and the low frequency F0 is greater than or equal to 20 Hz, that is, the frequency band range of the working frequency band from the low frequency F0 is greater than or equal to 20 Hz.

[0151] In some embodiments, the air conduction sound device 3 emits sound in the full frequency band of 20 to 20 kHz, the working frequency band of the bone conduction sound device 2 is greater than its low frequency F0, and the minimum value of the difference between its working frequency band and its low frequency F0 is greater than or equal to 20 Hz.

[0152] The bone conduction sound emitting device 2 and the air conduction sound emitting device 3 are connected to the circuit independently, so that the bone conduction sound emitting device 2 and the air conduction sound emitting device 3 can be independently controlled to emit sound. Figure 11b As shown, Figure 11b A block diagram of a head-mounted sound device according to an embodiment is shown. The head-mounted sound device includes a control chip 1120, a first power amplifier 1121, and a second power amplifier 1122 (power amplifier is short for power amplifier). The first power amplifier 1121 is electrically connected between the control chip 1120 and the bone conduction sound device 2 and can amplify the signal from the control chip 1120 to drive the bone conduction sound device 2. The second power amplifier 1122 is electrically connected between the control chip 1120 and the air conduction sound device 3 and can amplify the signal from the control chip 1120 to drive the air conduction sound device 3. By providing two power amplifiers to amplify the drive signals for the bone conduction sound device 2 and the air conduction sound device 3, respectively, the amplitudes of the bone conduction sound device 2 and the air conduction sound device 3 can be independently adjusted, thereby improving sound quality.

[0153] The frequency division control of the bone conduction sounding device 2 and the air conduction sounding device 3 can be achieved through a low-pass filter and a high-pass filter, that is, the frequency divider circuit includes a high-pass filter and a low-pass filter, and the driving signal of the corresponding frequency band is sent to the bone conduction sounding device 2 and the air conduction sounding device 3 through the high-pass filter and the low-pass filter for sound generation.

[0154] In some embodiments, the EQ (equalizer) of the bone conduction sound device 2 and the air conduction sound device 3 can be adjusted independently, allowing the sound effects of the two to be independently controlled, thereby adjusting the sound effects of the two and improving the sound quality. The control chip 1120 has a built-in EQ adjustment module, which can be used to adjust the sound effects of the sound devices.

[0155] For example, for the bone conduction sound generator 2, the EQ adjustment module can increase the gain in the 20-100Hz frequency band to compensate for the device's weak low-frequency performance, enhance low-frequency response, and make the sound fuller. The gain increase can be, for example, 2-6dB. Simultaneously, the gain near F0 is reduced to reduce vibration and numbness. The gain near F0 can be, for example, within the range of F0 ± 30Hz. Optionally, the gain reduction is at least 3-6dB, and further, at least 10dB (i.e., 10dB less than the normal sound pressure level) to effectively reduce numbness and amplitude near F0 to avoid collision noise. When the frequency range near F0 overlaps with 20-100Hz, only the gain near F0 is reduced. Fine-tune the gain in the 250-2kHz frequency band, leveraging the bone conduction sound generator 2's superior mid-range performance to maintain balance and clarity. Appropriately increase the gain of the frequency band above 2kHz, for example, increase the gain by 2 to 8dB, to compensate for the defect of weak high-frequency response in the bone conduction sound device and make the sound clearer and brighter.

[0156] For example, for the air conduction sound device 3, the EQ adjustment module can increase the gain of the frequency band from 20Hz to 100Hz, for example, by 2 to 4dB. This leverages the air conduction sound device 3's superior low-frequency performance to balance the low-frequency effect of the bone conduction sound device 2. The air conduction sound device 3 generally performs well in the mid-frequency band, and the gain of the frequency band from 150Hz to 4kHz can be fine-tuned according to actual conditions to maintain the clarity and naturalness of vocals and instruments. The air conduction sound device 3 generally performs strongly in the high-frequency band, and the gain of the frequency band above 4kHz can be appropriately reduced, for example, by 2 to 6dB to avoid excessive harshness.

[0157] It is understood that when the bone conduction sound-generating device 2 and the air conduction sound-generating device 3 operate in corresponding frequency bands, their sound effects can be adjusted using the above-described method. When the bone conduction sound-generating device 2 and the air conduction sound-generating device 3 are not operating in corresponding frequency bands, EQ adjustment may not be performed on that frequency band. Alternatively, even if EQ adjustment is applied to that frequency band, the driving signal is filtered and the desired adjustment effect on the sound-generating device cannot be achieved. In some embodiments, EQ adjustment can also be used to reduce the gain of a certain frequency band so that the bone conduction sound-generating device 2 and the air conduction sound-generating device 3 do not operate in that frequency band.

[0158] In some embodiments, the low frequency F0 of the bone conduction sound generating device 2 is 100-300 Hz. This low frequency F0 range can produce a good low frequency effect. If F0 is too low, the vibration amplitude of the bone conduction magnetic circuit component 21 will be too large, thereby generating noise and a large numbness, which will make people uncomfortable. If F0 is too high, a good low frequency playback effect cannot be achieved. Figure 12 , Figure 12 The frequency response curves of bone conduction sound-generating devices 2 with different low-frequency F0s according to some embodiments of the present invention are shown. As can be seen from the graph, when the low-frequency F0 is between 100 and 300 Hz, the peak value difference corresponding to the low-frequency F0 is small, indicating a more appropriate loudness. Alternatively, the low-frequency F0 of the bone conduction sound-generating device 2 can be set between 160 and 240 Hz to achieve an even more appropriate loudness at the low-frequency F0.

[0159] In some embodiments, the low-frequency resonance point (F0) of the air conduction sound device 3 in free space (i.e., when the back cavity is infinite) is between 50Hz and 280Hz. This frequency range allows for good bass performance without causing excessive vibration amplitude of the diaphragm 321, which could result in noise. At the same time, this ensures that the air conduction sound device 3 can effectively transmit and highlight the fundamental frequency components of speech, thereby improving speech clarity and intelligibility. Furthermore, the low-frequency response of the air conduction sound device 3 can be increased, compensating for the weak low-frequency response of the bone conduction sound device 2 and improving the sound quality in this low-frequency range.

[0160] In some embodiments, the ratio of the low-frequency resonance point of the bone conduction sounding device 2 to the low-frequency resonance point of the air conduction sounding device 3 is 1 to 4. The small difference in the low-frequency resonance points of the bone conduction sounding device 2 and the air conduction sounding device 3 means that the bone conduction sounding device 2 and the air conduction sounding device 3 can achieve peak response within a similar frequency range, thereby maintaining the phase consistency of the audio signal. If the difference in resonance frequency is too large, sound signals in different frequency bands may produce phase differences, resulting in chaotic and inharmonious sounds, thereby affecting the auditory experience. Similar resonance frequencies mean that when the sound switches between bone conduction and air conduction modes, the transition is more natural, and the auditory perception is not easily aware of obvious differences, which is conducive to the balance of bone conduction sound and air conduction sound, thereby improving the sound quality. Furthermore, the ratio of the low-frequency resonance point of the bone conduction sounding device 2 to the low-frequency resonance point of the air conduction sounding device 3 can be selected as 1.1 to 2.5 to further ensure the effect.

[0161] Optionally, the low-frequency F0 of the air conduction sound device 3 is smaller than the low-frequency F0 of the bone conduction sound device 2. When the bone conduction sound device 2 does not work near its low-frequency F0 or the low-frequency F0 of the bone conduction sound device 2 is gain-attenuated, although the vibration sensation can be reduced, the listening experience is likely to deteriorate. At this time, by setting the low-frequency F0 of the air conduction sound device 3 to be smaller than the low-frequency F0 of the bone conduction sound device 2, the low-frequency effect can be improved, thereby improving the overall sound effect.

[0162] In some embodiments, the ratio of the low-frequency resonance amplitude of the bone conduction sounding device 2 to the low-frequency resonance amplitude of the air conduction sounding device 3 is 0.5 to 2. The low-frequency resonance amplitude refers to the amplitude at the low frequency F0. Within this ratio range, the amplitudes of the bone conduction sounding device 2 and the air conduction sounding device 3 are slightly different, and the sensitivities they generate are relatively close, which can prevent one sound from appearing too prominent or being masked. It is also beneficial to the balance of bone conduction sound and air conduction sound, thereby further improving the sound quality. Further optionally, the ratio of the low-frequency resonance amplitude of the bone conduction sounding device 2 to the low-frequency resonance amplitude of the air conduction sounding device 3 is 0.7 to 1.3 to further ensure the effect. The sounds emitted by the bone conduction sounding device 2 and the air conduction sounding device 3 can be better integrated to provide a more natural and balanced sound quality. This helps to avoid the sense of sound separation and allows users to experience more consistent and harmonious sound. In addition, the amplitude difference between the bone conduction sound device 2 and the air conduction sound device 3 is small, and the intensity of the sound will be more evenly distributed in the bone conduction and air conduction paths, reducing the sound of a certain conduction mode from being too strong or too weak, thereby reducing auditory fatigue and improving the comfort of long-term wearing.

[0163] In some embodiments, the high-frequency cutoff frequency range of the air-conduction sound-generating device 3 is 3000Hz to 20000Hz, and can further be 5000Hz to 20000Hz. When the earphone head uses the bone-conduction sound-generating device 2 to generate sound, the earphone head contacts the human face, and the human facial skin is equivalent to a spring, forming a resonant system with the earphone head. The resonant frequency of this resonant system is relatively low, generally below 5000Hz, so the high-frequency attenuation of the bone-conducted sound is obvious, and the mid- and high-frequency sensitivity is low. By increasing the high-frequency cutoff frequency of the air-conduction sound-generating device 3, the air conduction of the air-conduction sound-generating device 3 can be used to improve the sensitivity of the mid- and high-frequency, thereby improving the mid- and high-frequency response of the entire device and improving the sound quality of the earphones. There are many ways to increase the high-frequency cutoff frequency. For example, the front cavity 10042 of the air conduction sound device 3 can be made smaller to increase the high-frequency resonance frequency of the air conduction sound device 3 in the earphone system. For example, the stiffness of the dome of the diaphragm 321 can be strengthened, for example, a reinforcing sheet 3213 made of PET or aluminum foil can be attached to the middle sheet 3211 of the diaphragm 321 (see reference numerals). Figure 62 and Figure 69 ).

[0164] In some embodiments, the total quality factor Qts of the air-conducted sound device 3 ranges from 0.5 to 2. The Qts value affects the frequency response and amplitude near F0. A higher Qts value results in a higher sensitivity near F0, but a larger amplitude. Limiting the Qts value to 0.5 to 2 can achieve a better balance between sensitivity and amplitude. The total quality factor Qts value is related to the mechanical quality factor (Qms) and the electrical quality factor (Qes). Adjusting the mechanical quality factor (Qms) and the electrical quality factor (Qes) can adjust Qts. Qts increases with an overall increase in Qms and Qes, and decreases with a decrease. For example, using a harder or heavier diaphragm 321 generally reduces Qms, while a softer diaphragm generally increases Qms. Furthermore, adding damping material, such as damping glue, to the air conduction sound device 3 (e.g., on the folding ring of the diaphragm 321) can reduce Qms. Furthermore, increasing the coil resistance can reduce Qes, while reducing the coil resistance can increase Qes. Furthermore, increasing the magnetic field strength of the magnet (or selecting a stronger magnetic material) generally reduces Qes. Furthermore, the overall quality factor is also related to the structure, mass, and volume of the various components of the air conduction sound device 3. In this specification, the overall quality factor Qms can also be adjusted by defining the structure, mass, and volume of each component.

[0165] Optionally, the total quality factor Qts value of the bone conduction sound emitting device 2 is 4 to 7. The higher the Qts value is, the faster the bone conduction sound emitting device 2 starts and stops, can respond to signals quickly, and has good transient performance.

[0166] Next, the vibration directions and sound outlets of the bone conduction sound emitting device 2 and the air conduction sound emitting device 3 are described with examples.

[0167] like Figure 4 As shown, 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 refers to the direction pointing to the inside of the shell 1000, which is opposite to the positive direction. Specifically, Figure 4, "+" and "-" indicate positive and negative directions, respectively. The positive direction of vibration direction A is upward, and the negative direction is downward. The positive direction of vibration direction B is leftward, and the negative direction is rightward. Optionally, the angle α1 between vibration direction A and contact surface 10010 is 60° to 90°. Further, optionally, the angle α1 between vibration direction A and contact surface 10010 is 75° to 90°. Even further, optionally, the angle α1 between vibration direction A and contact surface 10010 is 90°. As described above, when contact surface 10010 is a plane, the angle α1 between an object (e.g., vibration direction A) and contact surface 10010 is the angle between the object and the plane of contact surface 10010. When contact surface 10010 is a curved surface, the most convex or concave point of the curved surface has a tangent plane 10011. In this case, the angle α1 between the object and contact surface 10010 can be understood as the angle between vibration direction A and tangent plane 10011. Setting angle α1 to greater than 60° can reduce the component of vibration parallel to the face, allowing the vibration of bone conduction sound generator 2 to be better transmitted to the skull and reducing vibration loss.

[0168] The positive direction of the vibration direction B of the air conduction sound emitting device 3 points to the side shell portion 1004 of the housing 1000. The vibration direction B is not parallel to or coincides with the vibration direction A of the bone conduction sound emitting device 2. In other words, the vibration direction B of the air conduction sound emitting device 3 and the vibration direction A of the bone conduction sound emitting device 2 have an angle that is not zero. In some embodiments, the air conduction sound emitting device 3 is arranged to face away from the bone conduction sound emitting device 2 (the side where the diaphragm 321 of the air conduction sound emitting device 3 is located is its front side, and its bottom surface 3b is its back side). In this case, its diaphragm 321 is close to the sound outlet 1003, which is conducive to improving the sound transmission efficiency and increasing the volume. In other embodiments, reference Figure 10b The air conduction sound emitting device 3 is arranged facing the bone conduction sound emitting device 2. For example, an opening can be set on the bottom surface 3b or other parts of the air conduction sound emitting device 3, such as a vent 3c connecting the inside and outside of the air conduction sound emitting device 3, to allow sound to be transmitted.

[0169] refer to Figure 4 and Figure 8When the head-mounted sound-emitting device is worn, the side shell portion 1004 of the shell 1000 has a proximal end 10040 close to the human ear in its width direction Y. Obviously, the proximal end 10040 of the side shell portion 1004 is also the proximal end 10040 of the shell 1000, the outer shell assembly 100 and the sound-emitting unit 10. The air conduction sound emitting device 3 is arranged near the proximal end 10040 relative to the bone conduction sound emitting device 2, and is arranged to emit sound toward the proximal end 10040 of the side shell portion 1004. The sound outlet 1003 is opened on the proximal end 10040. In this way, the air conduction sound emitting device 3 can be close to the human ear and emit sound toward the human ear, which helps to improve the directness and clarity of the sound, reduce the loss and distortion of the sound, and enable people to hear louder air-conducted sound, with higher sound efficiency and better effect. Moreover, the volume of the air conduction sound emitting device 3 can be appropriately reduced, which is conducive to miniaturization. In addition, the bone conduction sound emitting device 2 is far away from the sound outlet 1003, which can reduce the interference caused by the internal sound waves emitted from the sound outlet when the bone conduction sound emitting device 2 vibrates. Figure 1 As shown, the proximal end 10040 is also the end of the side shell portion 1004 close to the functional compartment, and the sound outlet 1003 is opened on the end surface of the side shell portion 1004 of the outer shell component 100 facing the functional compartment.

[0170] In some embodiments, reference Figure 13 , the angle α2 between the vibration direction B of the air conduction sound emitting device 3 and the contact surface 10010 is 0 to 45°. Setting the angle α2 between the vibration direction B and the contact surface 10010 to 0 to 45° can make the sound emitted by the air conduction sound emitting device 3 better directed to the ear canal, improve the sound propagation efficiency, and reduce sound leakage. Further optionally, the angle α2 is 0 to 30°, and further, the angle α2 is 0 to 15°, so that the sound emitted by the air conduction sound emitting device 3 can be more accurately directed to the ear canal. When the angle α2 is greater than 0°, the positive direction of the vibration direction B of the air conduction sound emitting device 3 points to the side where the contact surface 10010 is located, and extends in the direction away from the bone conduction sound emitting device 2. Optionally, when the head-mounted sound emitting device is worn, the positive direction of the vibration direction B points to the inside of the auricle, thereby utilizing the sound-gathering effect of the auricle to improve the listening effect and help reduce sound leakage.

[0171] It is understandable that the angles of the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be adjusted in a variety of ways. Figure 13 In the illustrated embodiment, both are connected to the face cover 1001 and the side shell 1004, respectively, via a connector 12. The surface of the connector 12 that connects to the sound-generating device is inclined, so that the bone conduction sound-generating device 2 and the air conduction sound-generating device 3 are correspondingly inclined after installation. In other embodiments, the connector 12 may not be provided, and inclined surfaces may be provided on the face cover 1001 and the side shell 1004, with the bone conduction sound-generating device 2 and the air conduction sound-generating device 3 respectively installed on the corresponding inclined surfaces to adjust the angle.

[0172] In some embodiments, the angle α3 between the axial direction C of the sound outlet 1003 and the contact surface 10010 is 0 to 45°, so that the sound range emitted by it can be reliably transmitted to the ear. Further optionally, the angle α3 is 0 to 30°, and further, the angle α3 is 0 to 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 axial direction C of the sound outlet 1003 points to the side where the contact surface 10010 is located, so that the sound is guided by the sound outlet 1003 and propagates toward the ear canal, reducing sound leakage caused by outward divergence. Similarly, the positive direction of the axial direction C of the sound outlet 1003 refers to the direction toward the outside of the shell, and the negative direction is opposite to the positive direction. Optionally, when the head-mounted sound device is worn, the positive direction of the axial direction C points to the inside of the auricle, thereby utilizing the sound-gathering effect of the auricle to improve the listening effect and help reduce sound leakage.

[0173] It can be understood that the angle between the vibration direction or the axial direction (or other) and the contact surface 10010 (or other surface) is 0~N°, which means that the angle can be 0 degrees, that is, parallel to the contact surface 10010, or it can be greater than 0°, that is, inclined to the contact surface 10010, but the inclination angle is not greater than N°. For example, the angle α3 between the axial direction C of the sound hole 1003 and the contact surface 10010 is 0~45°, indicating that the axial direction C can be parallel to the contact surface 10010, or inclined relative to the contact surface 10010 and the angle does not exceed 45°.

[0174] In some embodiments, the axial direction C of the sound outlet 1003 aligns with the vibration direction B of the air conduction sound-generating device 3, further improving the efficiency of sound propagation. In some embodiments, angle α3 is greater than angle α2. The smaller angle α2 is, the more perpendicular it is to the depth direction of the housing 1000 and the cover 1001, which facilitates the utilization of the space within the housing assembly 100 and prevents the space occupied by the air conduction sound-generating device 3 and the bone conduction sound-generating device 2 from increasing due to the tilted arrangement. Furthermore, a smaller angle α2 can bring the center of the diaphragm closer to the sound outlet 1003. A shorter sound wave propagation path can increase the sound pressure level received by the human ear, allowing the air conduction sound-generating device 3 to output a higher volume at the same power. Therefore, angle α3 being greater than angle α2 facilitates the miniaturization of the sound-generating unit, or, while maintaining the same volume, increases the volume of the bone conduction sound-generating device 2 and / or the air conduction sound-generating device 3, thereby improving the sound quality. Optionally, the vibration direction A is perpendicular to the contact surface 10010 , and the vibration direction B is parallel to the contact surface 10010 . The air conduction sound emitting device 3 adjusts the direction of the sound emitted from the sound outlet hole 1003 through the sound outlet hole 1003 .

[0175] It is understandable that the axial direction C of the sound outlet 1003 can be adjusted in a variety of ways, for example, Figure 13In the illustrated embodiment, the sound hole 1003 is tiltedly arranged on the side shell portion 1004, and the axial direction C of the sound hole 1003 is changed by the inclination of the side shell portion 1004 relative to the side shell portion 1004. For example, the side shell portion 1004 can be arranged to be tilted relative to the contact surface 10010, and the sound hole 1003 is vertically arranged on the side shell portion 1004, and the axial direction C of the sound hole 1003 is changed by the inclination of the side shell portion 1004 relative to the contact surface 10010.

[0176] The number of the sound outlet holes 1003 can be one or more, for example, one, two, three or more. In some embodiments, the geometric center O1 of the projection of the outer contour of at least one sound outlet hole 1003 on the inner wall of the side shell portion 1004 along the vibration direction B on a plane perpendicular to the vibration direction B coincides with the geometric center O2 of the projection of the diaphragm 321 of the air conduction sound emitting device 3 along the vibration direction B on the same plane. In other embodiments, reference Figure 14 The number of the sound outlet hole 1003 is one, and the geometric center O1 of the outer contour of the sound outlet hole 1003 on the inner wall of the side shell portion 1004 projected along the vibration direction B does not coincide with the geometric center O2 of the diaphragm 321 of the air conduction sound generating device 3 projected along the vibration direction B. Figure 14 The outer contour of the diaphragm 321 is shown in dashed lines. When the sound outlet 1003 is concentrically arranged with the diaphragm 321, the resonance effect is aggravated. The concentricity of the sound outlet 1003 and the diaphragm 321 may cause resonance in the acoustic cavity, especially at higher frequencies. This may result in resonance peaks and attenuation valleys at some frequencies, affecting the naturalness and quality of the sound. Setting the sound outlet 1003 offset relative to the diaphragm 321, for example, at the edge of the diaphragm 321 or other locations, can avoid or alleviate this situation, maintain the normal vibration of the diaphragm 321, and improve the accuracy and clarity of the sound.

[0177] Optionally, the geometric center O1 of the sound outlet 1003 is offset toward the ear canal relative to the geometric center O2, making it closer to the ear canal, which is beneficial to improving the loudness and reducing the diffusion of sound to the space outside the head, thereby reducing sound leakage. Figure 14In some embodiments, the geometric center O1 of the sound hole 1003 is biased toward the side of the face cover 1001 relative to the geometric center O2 so as to be close to the ear canal. In some embodiments, the geometric center O1 of the sound hole 1003 is biased toward the connection 111a of the shell assembly 100 and the ear hook 111 relative to the geometric center O2, so that the sound hole 1003 is close to the ear canal. In other embodiments, the geometric center O2 of the diaphragm 321 is biased toward both the face cover 1001 and the connection 111a. Optionally, the distance D8 between the geometric center O2 of the diaphragm 321 and the geometric center O1 of the sound hole 1003 is 0.1 to 8 mm to obtain a better sound effect and ensure the structural strength of the shell. The distance D8 between the geometric center O2 of the diaphragm 321 and the geometric center O1 of the sound hole 1003 can be further optionally 1 to 4 mm to further ensure the effect.

[0178] The number of the sound holes 1003 can be one or more. In some embodiments, the total area of ​​all the sound holes 1003 is 10 to 130 mm2. The large total area of ​​the sound holes 1003 can allow the sound emitted by the diaphragm 321 to be better transmitted, and can also shift the high-frequency cutoff frequency of the air-conducting sound-emitting device 3 backward, thereby improving the sensitivity of the mid- and high-frequency ranges. When the sound holes 1003 are larger than 130 mm2, further increasing the area of ​​the sound holes 1003 has little effect on the backward shift of the high-frequency cutoff frequency, and if the sound holes 1003 are too large, it is easy to cause insufficient strength of the shell. Therefore, the area of ​​the sound holes 1003 can be selected to be 10 to 130 mm2. Figure 15The figure shows the frequency response curves of the sound units with sound outlet holes 1003 of different areas obtained by simulation. During the simulation, the air conduction sound-emitting device 3 emits sound, and the bone conduction sound-emitting device 2 does not emit sound. Except for the change in the area of ​​the sound outlet hole 1003, other parameters remain unchanged. It can be seen from the figure that as the area of ​​the sound outlet hole 1003 increases, the high-frequency cutoff frequency also increases, the frequency band before the high-frequency cutoff frequency becomes flatter, and the attenuation of the frequency response of the frequency band after the high-frequency cutoff frequency also becomes smaller. In this way, the bandwidth of the frequency response curve of the air conduction part of the entire device is also wider. The bandwidth refers to the difference between the frequency value corresponding to the high-frequency cutoff frequency and the frequency value corresponding to the resonance peak at F0. Generally speaking, the wider the bandwidth, the better the sound quality, and it can also effectively improve the sensitivity of the mid- and high-frequency bands and increase the volume of the air conduction. Because the bandwidth is wider, the sound details at high frequencies are more delicate. For example, when playing music symphonies or high-fidelity vocal music, the high notes of the violin and piano are clear and textured and can be distinguished by the human ear. The details of the breath or unique voice when singing can also be presented. At the same time, because the sound restoration is high and clear, the distortion is greatly reduced. The overall subjective listening will appear to be richer and warmer, which is of great help to the improvement of the overall sound quality. Therefore, setting the area of ​​the sound outlet 1003 to 10 to 130 mm2 is conducive to making the air conduction sound-generating device 3 have a better frequency response curve and improving the sound effect. Further optionally, the total area of ​​all the sound outlets 1003 is 40 to 100 mm 2 , while ensuring the sensitivity of medium and high frequencies, the structural strength of the shell is further guaranteed.

[0179] Optionally, the number of the sound outlet hole 1003 is one, so as to reduce the obstruction of the solid parts between the multiple sound outlet holes 1003 to the sound waves, so that the sound can be transmitted more efficiently.

[0180] Optionally, at least one sound outlet 1003 is in the shape of an elongated strip and is arranged in a direction parallel to the contact surface 10010 or the angle between the sound outlet 1003 and the contact surface 10010 does not exceed 15 degrees. This can reduce the diffusion of sound to the space outside the head, thereby reducing sound leakage. At the same time, the length direction of the air-conducting sound-emitting device 3 is arranged along the length direction X of the sound-emitting unit 10, so that the extension direction of the sound outlet 1003 is relatively close to or consistent with the length direction of the diaphragm 321, which is conducive to the propagation of sound waves. Further optionally, the width W4 of the sound outlet 1003 is 0.8 to 8 mm, and the length L11 is 3 to 15 mm. Further optionally, two or more sound outlets 1003 are arranged along the length direction of the sound outlet 1003 to further reduce sound leakage and improve sound propagation efficiency.

[0181] In some embodiments, reference Figure 13The vibration direction A of the bone conduction sound-generating device 2 is tilted relative to the contact surface 10010, and its positive direction points away from the air conduction sound-generating device 3. The positive direction of the vibration direction B of the air conduction sound-generating device 3 points away from the bone conduction sound-generating device 2. The vibration direction B can be tilted or parallel to the contact surface 10010. When the bone conduction sound-generating device 2 and the air conduction sound-generating device 3 are in operation, the vibrating components therein (i.e., the vibrator of the bone conduction sound-generating device 2 and the diaphragm assembly 32 of the air conduction sound-generating device 3) generate a certain vibration force. Because this vibration force is not completely perpendicular to the contact surface 10010, it generates a component force parallel to the contact surface 10010, which not only affects comfort but may also cause the earphone headphone to shift in a direction parallel to the contact surface 10010. Directing the positive vibration direction A of the bone conduction sound device 2 away from the air conduction sound device 3 and the positive vibration direction A of the air conduction sound device 3 away from the bone conduction sound device 2 can at least partially offset the force components parallel to the contact surface 10010 generated when the bone conduction sound device 2 and the air conduction sound device 3 vibrate simultaneously, thereby reducing or even eliminating vibrations parallel to the contact surface 10010 and improving wearing comfort and stability. The mass of the oscillator of the bone conduction sound device 2 is M1, and the mass of the diaphragm assembly 32 of the air conduction sound device 3 is M2. Optionally, the ratio of M1*cosα1 to M2*cosα2 is 0.8 to 1.2, further optionally 0.9 to 1.1, and even further optionally 1, to further ensure wearing comfort and stability. Here, "*" refers to the multiplication sign.

[0182] In some embodiments, as Figure 10a As shown, the thickness D1 of the bone conduction sound-generating device 2 is 5 mm to 6.5 mm (in the embodiment described in this specification, the thickness direction of the bone conduction sound-generating device 2 is consistent with its vibration direction A, and the thickness direction of the air conduction sound-generating device 3 is consistent with its vibration direction B). Within the available space of the earphone headphone, the thicker the bone conduction sound-generating device 2, the larger the volume of the bone conduction magnetic circuit assembly 21 can be made, the greater the magnetic flux B value of the effective magnetic circuit, and ultimately the driving force of the magnetic field provided is also greater, thereby providing a greater vibration amount, that is, improving the sensitivity of the bone conduction sound-generating device 2. Setting the thickness of the bone conduction sound-generating device 2 to 5 mm to 6.5 mm is conducive to achieving a good loudness effect without causing the earphone headphone head to be too thick. Furthermore, the thickness D1 of the bone conduction sound-generating device 2 is 5.5 mm to 6 mm to make it more appropriately sized.

[0183] The thickness D2 of the air conduction sound generating device 3 can be selected from 1.5 mm to 3 mm. The thickness D2 of the air conduction sound generating device 3 refers to the thickness D2 from the bottom surface 3b to the middle piece 3211 of the diaphragm 321 (see reference numerals). Figure 62 and Figure 69) between the outer surfaces, when the air conduction sound emitting device 3 includes a reinforcing sheet 3213, reference Figure 56 and Figure 61 The thickness D2 of the air-conduction sound-generating device 3 refers to the distance between its bottom surface 3b and the outer surface of its reinforcement plate 3213. An overly thin air-conduction sound-generating device 3 may limit the vibration range of the diaphragm. Furthermore, this thickness limitation prevents the ideal thickness of the magnetic circuit assembly. On the one hand, overly thin magnets in the magnetic circuit assembly are difficult to manufacture, leading to potential breakage during manufacturing, resulting in a reduced yield and increased costs. On the other hand, overly thin magnets can reduce the magnetic flux B value, ultimately reducing the driving force of the air-conduction sound-generating device 3 and sensitivity. This results in a decrease in the user's subjective and objective listening volume, ultimately affecting sound performance and quality. Overly thick components may increase resonance or cause other sound distortion. Furthermore, overly thick products lead to larger product sizes, making the earphone head heavier and more massive, reducing user comfort. This increased mass further increases the vibration mass of the bone conduction sound unit system, reducing sensitivity in the mid- and high-frequency bands and losing detail in sound transmission, ultimately resulting in reduced sound quality. Within the aforementioned thickness range, the air conduction sound device 3 provides good sound quality and occupies a relatively short length, facilitating the placement of the bone conduction sound device 2. This reduces the overall width of the earphone head and keeps the headphone head's mass within a reasonable range, ensuring sufficient driving force while maintaining a good listening experience for the user. Furthermore, the thickness D2 of the air conduction sound device 3 is between 2 mm and 2.8 mm, making it a more suitable size.

[0184] The thickness D1 of the bone conduction sound emitting device 2 is greater than the thickness D2 of the air conduction sound emitting device 3. Optionally, the ratio of the thickness D1 of the bone conduction sound emitting device 2 to the thickness D2 of the air conduction sound emitting device 3 is 1.7-3. On the one hand, the thickness D1 of the bone conduction sound-generating device 2 is greater than the thickness D2 of the air conduction sound-generating device 3. This can appropriately increase the volume of the bone conduction sound-generating device 2, that is, reserve as much available space in the earphone head as possible for the bone conduction sound-generating device 2, thereby ensuring that it has suitable space to set up the bone conduction magnetic circuit component, ensure the thickness and volume of the magnet, further improve the B value of the bone conduction magnetic circuit component, and improve the driving force of the bone conduction sound-generating device 2, that is, it can increase its vibration amount, thereby increasing its sound pressure level, and thus improving the sound effect of the sound unit 10; on the other hand, making the air conduction sound-generating device 3 thinner can reduce the space occupied by the air conduction sound-generating device 3 in the internal space of the housing assembly 100. When it is set close to the side shell portion 1004, more space can be left for the installation of the bone conduction sound-generating device 2, which is conducive to reducing the volume of the sound unit 10 or increasing the volume of the bone conduction sound-generating device 2.

[0185] Next, the connection structure between the air conduction sound generating device 3 and the housing assembly 100 and the relevant features of the front cavity are described with examples.

[0186] In some embodiments, the sound unit 10 further includes a front cavity 10042 and a rear cavity 10044. The front cavity 10042 and rear cavity 10044 are separated by the diaphragm 321 of the air-conducted sound-generating device 3. Specifically, the side of the diaphragm 321 facing the exterior of the housing assembly 100 is the front cavity, while the side of the diaphragm 321 facing the interior of the housing assembly 100 is the rear cavity. The front cavity 10042 is connected to the sound outlet 1003 to emit sound outward. The provision of the front cavity 10042 facilitates the concentrated emission of sound generated by the vibration of the diaphragm 321 through the front cavity 10042 and the sound outlet 1003, thereby improving sound transmission efficiency and reducing volume loss. This allows for the use of a smaller air-conducted sound-generating device 3, facilitating miniaturization of the sound unit 10. This also facilitates improved high-frequency sensitivity. It will be appreciated that the interior and exterior of the air-conducted sound-generating device 3 are connected to allow for smooth airflow and balance the air pressure inside and outside the air-conducted sound-generating device 3. Optionally, the air conduction sound generating device 3 is provided with at least one vent hole 3c communicating with the inside and outside thereof. The vent 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 member 310, for example. Figure 10a FIG3 shows a case where a vent hole 3c is provided on the magnetic bottom plate 3100. In some cases, sound can be emitted outward through the vent hole 3c, for example, referring to FIG3. Figure 10b When the bottom surface 3b of the air conduction sound emitting device 3 is arranged toward the sound outlet 1003, sound can be emitted outward through the vent hole 3c.

[0187] Optionally, the outer contour of the air-conducting sound-generating device 3 is roughly rectangular, and the cross-section of the front cavity 10042 is also roughly rectangular, so as to make full use of the internal space of the shell 1000, so that the cross-sectional dimension of the air-conducting sound-generating device 3 perpendicular to the vibration direction B can be made larger, thereby enabling the air-conducting sound-generating device 3 to increase its volume without excessively increasing its thickness, thereby ensuring the sound effect, and also enabling the diaphragm 321 to have a larger area, which is conducive to increasing the volume and enhancing the low-frequency effect.

[0188] Figure 16The frequency response curves of the sound unit 10 corresponding to front cavities of different volumes obtained through simulation are shown. During the simulation, the air conduction sound device 3 produces sound, while the bone conduction sound device 2 does not. Except for the change in the volume of the front cavity 10042, all other parameters remain unchanged. As can be seen from the figure, as the volume of the front cavity decreases, the high-frequency cutoff frequency increases, the curve between the high-frequency resonance peak and the low-frequency resonance peak becomes flatter, and the sound pressure level attenuation after the high-frequency resonance peak decreases. The volume of the front cavity 10042 refers to the volume of the space enclosed between the diaphragm assembly 32 and the sound outlet 1003. Optionally, the volume of the front cavity 10042 ranges from 10 to 250 mm³. A smaller front cavity 10042 helps extend the resonant frequency of the front cavity toward higher frequencies, preventing the high-frequency cutoff frequency from being too far forward, resulting in low high-frequency sensitivity, and thus improving the sound quality. However, a front cavity 10042 that is too small can affect the normal operation of the diaphragm 321, for example, causing the diaphragm 321 to contact the housing and generate noise. In order to enable the front cavity 10042 to provide sufficient vibration space for the diaphragm 321 and ensure that the high-frequency cutoff frequency is at the back, the volume of the front cavity 10042 can be further selected to be 50-200 mm3, and further selected to be 70-180 mm3, so that the volume of the front cavity 10042 is more appropriate, does not occupy too much space, and is also conducive to ensuring the structural strength of the shell.

[0189] In some embodiments, the bone conduction sound device 2 and the air conduction sound device 3 are located in the same cavity of the housing assembly 100, so that the housing assembly 100 has a larger rear cavity 10044. Figure 10a The housing 1000 is provided with a through hole 10000 communicating with the inside and outside thereof. For example, one or more (in this specification, a plurality includes two or more) through holes 10000 may be provided on the back cover 1002 and / or the side shell portion 1004. The through hole 10000 is communicated with the rear cavity 10044, which is beneficial to enlarge the rear cavity 10044 of the air conduction sound generating device 3, thereby reducing F0 and improving low-frequency sensitivity. Figure 10c As shown, Figure 10c The frequency response curves of the sound unit 10 with different total area sizes of through holes 10000 obtained by simulation are shown. During the simulation, the air conduction sound device 3 makes a sound, and the bone conduction sound device 2 does not make a sound. Except for the change in the area of ​​the through holes 10000, other parameters remain unchanged. It can be seen from the figure that when the total area of ​​the through holes 10000 is less than or equal to 0.3mm2, the frequency response curve is not good, and the low-frequency F0 is large, exceeding 1000Hz. Optionally, the total area range of all through holes 10000 is 1 to 80mm2 to improve the sound effect. The total area of ​​all through holes 10000 can further be selected to be 5 to 40mm 2 , so that the frequency response curve has a smaller low-frequency F0, the curve is smoother, and the sound effect is better.

[0190] The number of through holes 10000 can be one, for example, the area of ​​a single through hole 10000 is 1 to 80 mm2, further optionally 5 to 40 mm2. In some embodiments, the number of through holes 10000 is multiple, and the area of ​​a single through hole 10000 is 0.03 to 3 mm2. 2 , further optional 0.05 ~ 1mm 2 , so as to enlarge the rear cavity 10044 while preventing large sound leakage due to an oversized through hole 10000, and at the same time facilitate waterproofing and dustproofing. Optionally, the through hole 10000 is covered with a waterproof mesh and / or a dustproof mesh to achieve waterproofing and dustproofing effects. In other embodiments, the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be respectively arranged in two independent cavities, for example, separated by a partition to reduce mutual interference in operation. Optionally, the cavity where the air conduction sound generating device 3 is located is provided with a through hole 10000 that communicates with the outside world. The parameters of the through hole 10000 can be referred to above. Alternatively, 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 channel connecting the two cavities.

[0191] The air conduction sound generating device 3 is fixedly connected to the housing assembly 100. In some embodiments, the air conduction sound generating device 3 is connected to the inner wall of the side shell portion 1004, for example, through its diaphragm 321, air conduction bracket 30, magnetic conductive side plate 3101 and / or magnetic conductive bottom plate 3100 (see reference numerals). Figure 56 and Figure 61 ) and the like are connected to the inner wall. In other embodiments, in order to further reduce the space occupied by the air-conduction sound-generating device 3 in the interior of the housing assembly 100, the air-conduction sound-generating device 3 can be embedded in the side shell portion 1004 to reduce the space occupied by the air-conduction sound-generating device 3 in the interior of the housing assembly 100, thereby facilitating the miniaturization of the sound-generating unit 10. In addition, the firmness of the connection between the air-conduction sound-generating device 3 and the side shell portion 1004 can also be improved. For example, referring to Figure 8 and Figure 9 The inner wall of the side shell portion 1004 is provided with a mounting groove 10041, and the air conduction sound generating device 3 is disposed within the mounting groove 10041. In the illustrated embodiment, the air conduction sound generating device 3 is partially located within the mounting groove 10041. In other embodiments, the air conduction sound generating device 3 may also be completely located within the mounting groove 10041. Optionally, the depth D14 of the mounting groove 10041 is 0.3 to 1.5 mm, providing the air conduction sound generating device 3 with a sufficient embedding depth, thereby increasing the reliability of positioning and connection. At the same time, the wall thickness of the portion of the side shell portion 1004 for mounting the air conduction sound generating device 3 is not excessively thick, which helps to reduce the mass of the sound generating unit 10.

[0192] Optionally, the face cover 1001 is connected to the end face 1000a of the shell 1000, and the mounting groove 10041 is connected to the end face 1000a. In this way, the air-conducting sound-generating device 3 can be installed directly downward from the end face 1000a, which is more convenient to install and can make more full use of the space in the thickness direction of the sound-generating unit 10, which is conducive to increasing the volume of the air-conducting sound-generating device 3 and the effective radiation area of ​​the diaphragm 321, or reducing the volume of the sound-generating unit 10. Figure 9 In the illustrated embodiment, the mounting groove 10041 is not connected to the back cover 1002 and is spaced apart from the back cover 1002. Further optionally, in other embodiments, the mounting groove 10041 is connected to the back cover 1002 to further improve space utilization and increase the available size of the air-conducting sound-emitting device 3 in the thickness direction of the sound-emitting unit 10.

[0193] The air-conducting sound-generating device 3 can be glued to the inner wall of the mounting groove 10041 and / or the back cover 1002 and / or the surface cover 1001. When the air-conducting sound-generating device 3 is connected to two or all of the mounting groove 10041, the back cover 1002 and the surface cover 1001, the firmness of the connection can be further ensured, and the reliability of the operation of the air-conducting sound-generating device 3 can be ensured. Optionally, the air-conducting sound-generating device 3 is glued to the bottom surface 10043 of the mounting groove 10041, for example, by means of double-sided tape or gluing. For example, refer to Figure 10a The outer edge of the diaphragm 321 of the air-conducted sound-generating device 3 (e.g., the outer ring 3210 described below) is adhered to the bottom surface 10043 of the groove. In other embodiments, the air-conducted sound-generating device 3 further includes a pressure cap 33 connected to the diaphragm 321. In this case, the pressure cap 33 can be adhered to the bottom surface 10043 of the groove. In other embodiments, the air-conducted sound-generating device 3 can also be adhered to the bottom surface 10043 of the groove via its magnetic base plate 3100. The air-conducted sound-generating device 3 can also be adhered to the side walls of the mounting groove 10041 and the face cover 1001 using glue to improve the firmness of the connection. Optionally, when the air-conducted sound-generating device 3 is installed in the mounting groove 10041, it is flush with the end face 1000a of the housing 1000 facing the face cover 1001, facilitating installation and adhesion of the face cover 1001. Optionally, the air-conducted sound-generating device 3 can also be adhered to the back cover 1002. In some embodiments, a cavity may be further provided on the cover 1001 , and the air conduction sound emitting device 3 extends beyond the end surface 1000 a into the cavity, thereby increasing the volume of the air conduction sound emitting device 3 and improving space utilization.

[0194] refer to Figure 9 and Figure 10aThe side shell portion 1004 of the housing 1000 is provided with the aforementioned front cavity 10042, which communicates with the mounting groove 10041 and the sound outlet 1003. The front cavity 10042 is provided corresponding to the sound outlet surface (i.e., the diaphragm 321) of the air conduction sound-generating device 3, and extends from the bottom surface 10043 of the mounting groove 10041 toward the sound outlet 1003. It is understood that the mounting groove 10041 is not required. For example, the mounting groove 10041 may be omitted, and the front cavity 10042 may be directly formed on the inner wall of the side shell portion 1004 and communicate with the sound outlet 1003. The air conduction sound-generating device 3 is also directly connected to the inner wall of the side shell portion 1004.

[0195] Next, the bone conduction sound emitting device 2 of the sound emitting unit 10 is described with an example.

[0196] First, it should be noted that the bone conduction sound generating device 2 and the air conduction sound generating device 3 include similar components, such as a bracket, magnetic circuit assembly, and coil. For ease of distinction, the corresponding components of the bone conduction sound generating device 2 and the air conduction sound generating device 3 are referred to as bone conduction components or air conduction components, respectively. For example, the bracket, magnetic circuit assembly, and coil of the bone conduction sound generating device 2 are respectively referred to as the bone conduction bracket, bone conduction magnetic circuit assembly, and bone conduction coil; while the bracket, magnetic circuit assembly, and coil of the air conduction sound generating device 3 are respectively referred to as the air conduction bracket, air conduction magnetic circuit assembly, and air conduction coil.

[0197] Figure 17 is a schematic structural diagram of a bone conduction sound generating device 2 according to some embodiments of this specification. Figure 18 yes Figure 17 The figure shows a cross-sectional schematic diagram of a bone conduction sound-generating device 2. The bone conduction sound-generating device 2 includes a bone conduction support 20, a bone conduction magnetic circuit assembly 21, at least one bone conduction coil 22, and at least one spring 23. Both the bone conduction magnetic circuit assembly 21 and the bone conduction coil 22 are disposed within the bone conduction support 20, with the spring 23 connected between the bone conduction support 20 and the bone conduction magnetic circuit assembly 21. Optionally, the spring 23 is connected to the end surface 202 of the bone conduction support 20. The bone conduction coil 22 surrounds the exterior of the bone conduction magnetic circuit assembly 21 and is fixed relative to the bone conduction support 20, driving the bone conduction magnetic circuit assembly 21 to vibrate. The bone conduction magnetic circuit assembly 21 is connected to the bone conduction support 20 via the spring 23 and can be reset by the elastic force of the spring 23. The bone conduction sound-generating device 2 is connected to a cover 1001 to transmit vibrations to the cover 1001. For example, the connection to the cover 1001 may be via the bone conduction support 20, the spring 23, or the connector 12. In this specification, the stator of the bone conduction sound generating device 2 refers to the part that does not move relative to the housing assembly 100 when the bone conduction sound generating device 2 is in operation, including components such as the bone conduction bracket 20 and the bone conduction coil 22. The vibrator of the bone conduction sound generating device 2 refers to the part that moves relative to the bone conduction bracket 20 when the bone conduction sound generating device 2 is in operation, including components such as the bone conduction magnetic circuit assembly 21 and the spring 23.

[0198] In some embodiments, the bone conduction support 20 is annular, with both ends open, and surrounds the outside of the bone conduction magnetic circuit assembly 21 and the bone conduction coil 22. Optionally, the shape of the bone conduction support 20 is a rectangular ring (the four corners can be rounded, right angles, beveled, or other curved shapes that reduce the volume of the four corners), which is more convenient for installation in the housing assembly 100 with the air conduction sound device 3, and more fully utilizes the space within the housing assembly 100. It is 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 19 That is, it shows a schematic diagram of the bone conduction sound generating device 2 when the bone conduction support 20 is in a racetrack shape.

[0199] In some embodiments, the bone magnetic circuit assembly 21 includes at least one magnet 210 and at least two magnetic conductive plates 211, with a magnet 210 connected between two adjacent magnetic conductive plates 211. The north and south poles of the magnets 210, as well as the magnets 210 and the magnetic conductive plates 211, are arranged along the vibration direction A of the bone magnetic circuit assembly 21. When there are two or more magnets 210, the polarity of the opposing magnetic poles of two adjacent magnets 210 is the same (i.e., the same poles are facing each other). An annular bone magnetic gap 24 is formed between the bone magnetic circuit assembly 21 and the bone conduction support 20. A bone conduction coil 22 surrounds the magnetic conductive plates 211 and is located within the bone magnetic gap 24 between the bone conduction support 20 and the bone magnetic circuit assembly 21. When alternating current is applied to the bone conduction coil 22, it drives the bone magnetic circuit assembly 21 to vibrate back and forth, and the vibration is transmitted to the bone conduction support 20 and the cover 1001 via the spring 23. At least one or all of the magnetic conductive plates 211 are surrounded by a bone conduction coil 22. Optionally, at least two of the magnetic conductive plates 211 are surrounded by a bone conduction coil 22 to increase the driving force of the bone conduction coil 22 and improve the volume. In other embodiments, only one of the magnetic conductive plates 211 may be surrounded by a bone conduction coil 22.

[0200] Figure 18 、 Figures 20 to 23 as well as Figure 50 A schematic structural diagram of a bone magnetic circuit assembly 21 according to some embodiments of this specification is shown.

[0201] Figure 18 、 Figure 20 and Figure 50 In the illustrated embodiment, the bone magnetic circuit assembly 21 includes a magnet 210 and two magnetic conductive plates 211 arranged along the vibration direction A. The two magnetic conductive plates 211 are connected to both sides of the magnet 210. A bone conductive coil 22 surrounds each of the two magnetic conductive plates 211. Figure 18 、 Figure 20 and Figure 50 The difference between the structures shown is that Figure 18 The magnetic conductive plate 211 shown is provided with a boss 2113 and a recess 2114. Figure 20 The magnetic conductive plate 211 shown is provided with a boss 2113 but not a recess 2114. Figure 50 The magnetic conductive plate 211 is shown with a gasket 26 connected thereto.

[0202] Figure 21 In the illustrated embodiment, the bone magnetic circuit assembly 21 includes three magnets 210 and two magnetic conductive plates 211 arranged along the vibration direction A. A magnetic conductive plate 211 is connected between two adjacent magnets 210. The two adjacent magnets 210 are arranged with the same poles facing each other. A bone conductive coil 22 surrounds the magnetic conductive plate 211 located between the two adjacent magnets 210. Compared to a single-magnet structure, the three-magnet structure can increase sensitivity.

[0203] Figure 22 In the illustrated embodiment, the bone magnetic circuit assembly 21 includes three magnets 210 and four magnetic conductive plates 211 arranged along the vibration direction A. A magnet 210 is connected between two adjacent magnetic conductive plates 211. Two adjacent magnets 210 are arranged with the same poles facing each other. A bone conductive coil 22 surrounds the outer surface of the magnetic conductive plates 211 located between two adjacent magnets 210. Because the outermost magnetic conductive plates 211 are located on the outermost side of the bone magnetic circuit assembly 21, magnetic flux leakage is reduced.

[0204] Figure 23 In the illustrated embodiment, the bone magnetic circuit assembly 21 includes two magnets 210 and three magnetic conductive plates 211 arranged along the vibration direction A. A magnet 210 is connected between two adjacent magnetic conductive plates 211. Two adjacent magnets 210 are arranged with the same poles facing each other. A bone conductive coil 22 surrounds the outer surface of the magnetic conductive plates 211 located between two adjacent magnets 210. Because the outermost magnetic conductive plates 211 are located on the outermost side of the bone magnetic circuit assembly 21, magnetic flux leakage is reduced.

[0205] It can be understood that in other embodiments, the bone magnetic circuit assembly 21 can also include two magnets 210 and a magnetic conductive plate 211 arranged along the vibration direction A, the two magnets 210 are respectively connected to the two sides of the magnetic conductive plate 211, and a bone conductive coil 22 is surrounded by the outside of the magnetic conductive plate 211.

[0206] Next, the bone conduction support 20 of the bone conduction sound generating device 2 is described with an example.

[0207] The bone conduction support 20 can be made of either a magnetically conductive material or a non-magnetic material. The non-magnetic material can be a non-metallic, low-density material such as plastic PC, ABS, PC+ABS, or PC+fiberglass. A bone conduction support 20 made of a non-magnetic material can reduce the mass of the bone conduction sound generator 2 and the stator mass of the bone conduction sound generator 2, thereby improving the mid- and high-frequency sensitivity of the bone conduction sound generator 2. When the bone conduction support 20 is made of a magnetically conductive material (such as magnetically conductive stainless steel), the BL value (the BL value reflects electromagnetic characteristics and is the product of magnetic field strength and coil conductor length) can be increased, magnetic leakage can be reduced, and mid-frequency sensitivity can be improved. In this specification, unless otherwise specified, the bone conduction support 20 is made of a magnetically conductive material. Optionally, the magnetic material used to make the magnetic bone conduction stent 20 has a tensile strength of 430 MPa to 780 MPa, further preferably 450 to 600 MPa, a yield strength greater than 200 MPa, an elongation greater than 20%, and a chemical composition containing greater than 50% iron and 15 to 20% chromium. This helps ensure that the bone conduction stent 20 has good strength and prevents breakage and deformation. The chromium content of the bone conduction stent 20 improves corrosion resistance, strength and hardness, high-temperature performance, wear resistance, magnetic conductivity, and magnetic flux leakage prevention. Exemplary materials for the magnetic bone conduction stent 20 include SUS430 and SUS304.

[0208] Figure 24 A simulation diagram shows the BL values ​​of bone conduction sound-generating devices according to some embodiments of this disclosure when bone conduction stents 20 of varying wall thickness are installed. During the simulation, only the wall thickness of the bone conduction stent 20 was varied, while other parameters remained constant. The magnetic steel offset refers to the displacement of the bone magnetic circuit assembly 21 relative to its original position during vibration. When the bone magnetic circuit assembly 21 deviates from its original position, the magnetic field strength at the bone conduction coil 22 also changes. As can be seen from the diagram, the magnetic bone conduction stent 20 has a higher BL value than the non-magnetic bone conduction stent 20. As the wall thickness of the magnetic bone conduction stent 20 increases, the BL value within the bone magnetic gap 24 also increases overall. Figure 25 This is a simulation diagram of the magnitude of magnetic flux leakage when a bone conduction stent 20 with different wall thicknesses is installed in a bone conduction sound-generating device according to an embodiment of the present application specification. During the simulation, only the wall thickness of the bone conduction stent 20 changes, while other parameters remain unchanged. The distance from the driver side refers to the distance from the outer peripheral surface 2a of the bone conduction sound-generating device 2 in a direction perpendicular to the vibration direction A. As can be seen from the figure, the overall magnetic flux leakage is smaller when the bone conduction stent 20 is made of magnetic conductive material compared to when it is made of non-magnetic conductive material, and the greater the wall thickness of the magnetic conductive bone conduction stent 20, the smaller the magnetic flux leakage. Figure 24 and Figure 25It can be seen that when the bone conduction bracket 20 is too thin, its magnetic conductivity is insufficient, magnetic leakage is large, and the BL value is relatively small. Conversely, if the bone conduction bracket 20 is too thick, it increases the mass of the bone conduction magnetic circuit assembly 21, reducing the high-frequency sensitivity of the bone conduction sound-generating device 2 and worsening the wearing experience. To balance wearing comfort and sound quality, in some embodiments, the wall thickness B1 of the bone conduction bracket 20 is 0.3-0.5 mm. It is understood that the wall thickness B1 of the bone conduction bracket 20 can be uniform or unequal, as long as the wall thickness B1 is within the specified range. The wall thickness B1 can further be 0.35-0.45 mm, for example, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, or 0.5 mm.

[0209] In some embodiments, as Figure 26 As shown, Figure 26 For the Figure 18 The cross-section obtained by the EE cutting line, Figure 26 In the illustrated embodiment, the bone conduction support 20 is rectangular and annular, with four corners 200. Optionally, the corners 200 are arc-shaped, and the corners of the bone conduction support 20 have a uniform wall thickness. Of course, the entire bone conduction support 20 can also have a uniform wall thickness. It is understood that the radius R5 of the inner wall of the corners 200 affects the cross-sectional area of ​​the internal space of the bone conduction support 20, which in turn determines the size of the bone conduction magnetic circuit assembly 21 and bone conduction coil 22 that can be accommodated. Therefore, the smaller the radius, the larger the bone conduction coil 22 and bone conduction magnetic circuit assembly 21 that can be accommodated, which increases the BL value. Therefore, from a performance perspective, a smaller radius R5 of the corners 200 is preferred. However, the smaller the corners 200, the sharper their outer corners. In particular, when the radius R5 of the corners 200 is zero, the bone conduction support 20 has four sharp corners, which can easily damage other components within the sound unit 10. Taking into account the performance and structure, the radius R5 of the corner 200 can be set to a range of 0.5 to 4 mm, further to 1.5 to 3.5 mm, and further to 2 to 3 mm. For example, the radius R5 of the corner 200 can be set to a range of 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm or 4 mm.

[0210] like Figure 17 and Figure 18As shown, the height h of the bone conduction support 20 limits the height of the bone conduction sound-generating device 2 to a certain extent, which in turn limits the minimum thickness of the earphone head. If the height of the bone conduction support 20 is too small, the thickness of the bone conduction magnetic circuit assembly 21 is limited, resulting in a weak magnetic field strength and a low BL value within the bone conduction magnetic gap 24. This low BL value can lead to insufficient loudness from the bone conduction sound-generating device 2. If the bone conduction support 20 is too high, the earphone head will become thicker and larger, making it uncomfortable to wear. To ensure that the bone conduction sound-generating device 2 has a good sound quality without making the earphone head too large, in some embodiments, the height h of the bone conduction support 20 is set to 4.5 to 6.3 mm, and can further be set to 5 to 6 mm, for example, 4.5 mm, 5 mm, 5.5 mm, 6 mm, or 6.3 mm.

[0211] like Figure 17 and Figure 18 As shown, the bone conduction coil 22 typically includes two leads 220 for current flow in and out. To facilitate routing of the bone conduction coil 22, the bone conduction bracket 20 is provided with an outlet hole 201 for the leads 220 of the bone conduction coil 22 to pass through. Optionally, the outlet hole 201 is provided on the outer wall 203 of the bone conduction bracket 20 at the junction of the ear hook 111 and the housing assembly 100, facilitating connection and routing. Further, the outlet hole 201 is optionally connected to the end face 202 of the bone conduction bracket 20, facilitating the insertion of the leads 220 of the bone conduction coil 22 within the outlet hole 201. For example, the leads 220 can be placed within the outlet hole 201 while the bone conduction coil 22 is being installed, and the spring clip 23 can be subsequently installed on the end face 202. The outlet hole 201 provides clearance for the leads of the bone conduction coil 22, preventing the bone conduction coil 22 from being crushed by the spring clip. Optionally, wire outlet holes 201 are symmetrically provided on two opposite side walls of the bone conduction bracket 20 to prevent reverse installation and facilitate wire outlet.

[0212] The wire outlet holes 201 can reduce the mass of the stator portion of the bone conduction sound generator 2. Generally, the lighter the stator portion, the higher the mid- and high-frequency sensitivity of the bone conduction sound generator 2. Furthermore, the wire outlet holes 201 connecting the inside and outside of the bone conduction bracket 20 can facilitate airflow during vibration of the bone conduction magnetic circuit assembly 21, reduce echo, and enhance the sound produced by the earphones. In some embodiments, the total area of ​​all wire outlet holes 201 accounts for 0.5% to 10% of the total area of ​​the outer circumference of the bone conduction bracket 20. This can reduce the mass of the stator portion and improve mid- and high-frequency sensitivity. Generally, a 0.5% area ratio of the wire outlet holes 201 reduces the weight by approximately 5 mg, a 1% area ratio reduces the weight by approximately 10 mg, and so on. Furthermore, optionally, the total area of ​​all wire outlet holes 201 accounts for 1% to 2% of the total area of ​​the outer circumference of the bone conduction bracket 20. While improving mid- and high-frequency sensitivity, it also reduces magnetic flux leakage caused by an overly large area of ​​the wire outlet holes 201 and helps ensure the strength of the bone conduction bracket 20.

[0213] When the bone conduction device 2 includes two or more bone conduction coils 22, the coils 22 are connected in series, and the currents in adjacent coils 22 flow in opposite directions to reduce inductance and improve mid- and high-frequency sensitivity. The current direction in the bone conduction coils 22 can be changed by changing the winding direction. Figure 17 and Figure 18 In the illustrated embodiment, there are two bone conduction coils 22, which are arranged in series with opposite current directions. The bone conduction sound generating device 2 also includes an external circuit board 25 attached to the outer surface of the bone conduction bracket 20. The external circuit board 25 can be a flexible circuit board. Optionally, the external circuit board 25 is arranged on the outer wall 203 of the bone conduction bracket 20 at the connection between the ear hook 111 and the housing assembly 100, facilitating connection with external wires (such as the cables or wires mentioned below). Furthermore, the wire outlet 201 and the external circuit board 25 are arranged on the same outer wall 203, facilitating soldering the leads 220 of the bone conduction coils 22 to the external circuit board 25. It is understood that the direction of the current in the bone conduction coil 22 can also be changed by changing the connection position of the coil leads to the solder pads on the external circuit board 25 and the circuit design on the external circuit board 25. In some embodiments, the external circuit board 25 and the wire outlet hole 201 are located at one end of the bone conduction support 20 in the length direction, and the wire outlet hole 201 is not adjacent to the diaphragm 321 .

[0214] The following describes the external circuit board 25 outside the bone conduction stent 20 and its connection with the bone conduction coil 22.

[0215] In some embodiments, as Figure 27 As shown, the external circuit board 25 is provided with a plurality of pads, which can be divided into a first pad group 250 for connecting to the lead 220 of the bone conduction coil 22 and a second pad group 251 for connecting to an external wire. The external wire can be electrically connected to the control circuit board in the control compartment 112, for example. The first pad group 250 and the second pad group 251 each include two pads. The number of the first pad group 250 corresponds to the number of the bone conduction coils 22. Figure 27In the illustrated embodiment, there are two bone conduction coils 22, corresponding to two first solder pad groups 250. Two wire outlet holes 201 are exposed from both ends of the external circuit board 25 along the axis of the bone conduction support 20 (aligned with the vibration direction A) to facilitate wiring. The two first solder pad groups 250 are located above and below the second solder pad group 251, respectively, and are adjacent to the two wire outlet holes 201. The six solder pads on the external circuit board 25 are arranged in pairs, divided into three groups. The first solder pad group 250 and the second solder pad group 251 are arranged along the axis of the bone conduction support 20 (aligned with the vibration direction A), with the second solder pad group 251 located between the two first solder pad groups 250. The first pad group 250 is connected to the leads of the corresponding bone conduction coil 22. Specifically, the two leads 220 of the upper bone conduction coil 22 are soldered to the two corresponding pads of the upper first pad group 250, the two leads 220 of the lower bone conduction coil 22 are soldered to the two corresponding pads of the lower first pad group 250, and the wires are soldered to the two corresponding pads of the second pad group 251. This makes wiring more convenient and shortens the path of the leads 220, thereby reducing resistance losses in the circuit, lowering the power consumption of the earphones, and reducing the risk of the bone conduction coil 22 being scratched.

[0216] like Figure 28As shown, the upper first pad group 250 includes pad one 2501 and pad two 2502, the lower first pad group 250 includes pad three 2503 and pad four 2504, and the second pad group 251 includes pad five 2505 and pad six 2506. One of the two pads in the second pad group 251 (pad five 2505 in the figure) is electrically connected to one of the two pads in the upper first pad group 250 (pad two 2502 in the figure), and the other (pad six 2506 in the figure) is electrically connected to one of the two pads in the lower first pad group 250 (pad four 2504 in the figure). The pad in the upper first pad group 250 that is not connected to the second pad group 251 (pad one 2501 in the figure) is electrically connected to the pad in the lower first pad group 250 that is not connected to the first pad group 250. The pads connected to the second pad group 251 (pad three 2503 in the figure) are electrically connected. The two leads 220 of the upper bone conduction coil 22 are respectively soldered to the two pads of the adjacent first pad group 250, and the two leads 220 of the lower bone conduction coil 22 are respectively soldered to the two pads of the adjacent first pad group 250. The two pads of the middle second pad group 251 are respectively connected to external wires. This facilitates wiring and, after wiring is completed, the two bone conduction coils 22 are connected in series. Optionally, the connected pads in the upper first pad group 250 and the lower first pad group 250 are located on the same side to shorten the length of the first conductive portion 2507 connecting the two. This also shortens the length of the second connecting portion 2508 connecting the second pad group 251 to the pads of the lower first pad group 250. Furthermore, the length of the third connecting portion 2509 connecting the second pad group 251 to the pads of the upper first pad group 250 is also relatively short.

[0217] Optionally, the external circuit board 25 is rectangular with a thickness of 0.1 to 0.3 mm. The length L1 (aligned with the vibration direction A) of the external circuit board 25 is 3.5 to 4.5 mm, and the width W1 is 3 to 4 mm. This ensures that the FPC has suitable strength while not taking up too much space, leaving enough space for arranging six solder pads.

[0218] The area of ​​a single pad in the second pad group 251 is equal to or greater than that of a single pad in the first pad group 250. Optionally, the area of ​​a single pad in the second pad group 251 is larger than that of a single pad in the first pad group 250. The leads 220 of the bone conduction coil 22 are thinner than those of electrical wires, so the pads used can be relatively small. This effectively utilizes the surface space of the external circuit board 25 while ensuring soldering reliability. The pad shape can be, for example, circular, rectangular, or polygonal. Exemplarily, the pad shape is rectangular. Optionally, the area of ​​a single pad in the second pad group 251 is 0.35 to 0.9 mm² larger than that of a single pad in the first pad group 250. Optionally, the length and width of a single pad in the first pad group 250 are 0.8 to 1.2 mm, while the length and width of a single pad in the second pad group 251 are 1 to 1.4 mm.

[0219] Optionally, a plating layer is provided on the surface of the pad, and the plating material may be, for example, tin, nickel, or gold, or a superposition of these material layers, and the plating thickness may be, for example, 3 to 30 μm. In some embodiments, the plating material is tin, and the plating thickness may be, for example, 5 to 30 μm. In some embodiments, the plating material includes a nickel layer and a gold layer stacked in sequence, wherein the nickel layer is 3 to 8 μm and the gold layer is 0.03 to 1 μm.

[0220] Next, the spring piece 23 of the bone conduction sound generating device 2 is described with an example.

[0221] The number of the springs 23 can be one, two or more. Figure 17 and Figure 18 As shown, the bone conduction sound generating device 2 includes two springs 23, which are spaced apart along the vibration direction A. Optionally, the two springs 23 are respectively arranged at both ends of the bone conduction magnetic circuit component 21 along the vibration direction A, which can improve the stability of the vibration and help prevent the bone conduction magnetic circuit component 21 from swinging (or rolling vibration) during the vibration process, thereby reducing the risk of it colliding with side components. The spring 23 is generally sheet-shaped, and its thickness B2 is 0.1mm to 0.25mm, and can further be 0.13mm to 0.2mm. Figure 29aThe spring clip 23 includes an outer frame 230, an inner frame 231 positioned within the outer frame 230, and at least two elastic arms 232 connected between the outer frame 230 and the inner frame 231. The outer frame 230 is connected to the bone conduction support 20. Optionally, the spring clip 23 is in contact with the end surface 202 of the bone conduction support 20. The outer frame 230 and the bone conduction support 20 can be connected by gluing or welding. Exemplarily, the outer frame 230 and the end surface 202 are connected by welding. Welding provides a stronger bond than adhesive bonding, resulting in a more stable elastic modulus of the spring clip 23, which is beneficial for the stability of the low-frequency F0 of the bone conduction sound generating device 2. For example, spot welding or wire welding can be used, with wire welding being preferred. Wire welding reduces welding slag, thereby preventing it from entering the product and causing noise. It also offers stronger welding strength than spot welding or adhesive bonding, which enhances reliability.

[0222] In some embodiments, reference Figure 29a , the outer frame 230 is continuous and annular. In other embodiments, the outer frame 230 is discontinuous, referring to Figure 30 , which can be in the form of a discontinuous ring (or discontinuous ring), or, referring to Figure 31 , which may simply include a plurality of sheet portions 2303 connected to the elastic arms 232. By selecting an outer frame 230 in a continuous ring, a discontinuous ring, or other forms, the mass of the elastic sheet 23, and thus the mass of the bone conduction sound generating device 2, can be adjusted. Unless otherwise specified, this specification uses the outer frame 230 in a continuous ring shape as an example.

[0223] Optionally, the tensile strength of the material of the shrapnel 23 is 500MPa to 1600MPa, further optionally 900 to 1500MPa, and the yield strength of the shrapnel 23 is greater than 200MPa, further optionally greater than 800MPa. When the shrapnel 23 is made of stainless steel, the material contains more than 50% iron and 15 to 20% chromium, which is beneficial for improving corrosion resistance, strength and hardness, and improving high-temperature performance and wear resistance. Exemplarily, the material of the shrapnel 23 is stainless steel, such as SUS301EH, SUS301H, SUS304H, etc. The material of the shrapnel 23 can also be beryllium copper, etc. The mass of the shrapnel 23 can be, for example, 0.08 to 0.13g. Optionally, the shrapnel 23 is made of a non-magnetic material.

[0224] Optionally, the Young's modulus of the spring piece 23 is 160-220 GPa to provide better rigidity, thereby making the spring piece 23 less likely to deform and improving reliability.

[0225] The spring piece 23 may include a plurality of elastic arms 232, and the plurality of elastic arms 232 are rotationally symmetrically arranged with the center of the inner frame 231 as the center. The number of the elastic arms 232 may be, for example, 2, 3, 4 or more. Optionally, the spring piece 23 includes 2 to 4 elastic arms 232. Figure 29a 、 Figure 29b 、 Figure 29c and Figure 40 The spring clip 23 shown includes two elastic arms 232 arranged symmetrically with respect to the center. The elastic arms 232 of the spring clip 23 have an inner connecting portion 2320 connected to the inner frame 231 and an outer connecting portion 2321 connected to the outer frame 230. Hereinafter, unless otherwise specified, the spring clip 23 having two elastic arms 232 will be described as an example.

[0226] Figure 29b and Figure 29c According to this specification Figure 29a In the top view of the spring clip 23 of the illustrated embodiment, there are two elastic arms 232. The outer connecting portion 2321 of each 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 along the long side 2300, before turning to connect with the end of the inner frame 231 facing away from the outer connecting portion 2321. Thus, the inner connecting portions 2320 of the two elastic arms 232 are respectively connected to the inner frame 231 at both ends along the length of the spring clip 23, which can more effectively utilize the space in the length direction of the spring clip 23 and reduce the space occupied in the width direction, thereby ensuring the width and length of the elastic arms 232. Optionally, the inner frame 231 is generally rectangular and aligns with the length and width of the outer frame 230. This ensures a connection area with the bone magnetic circuit assembly 21 while reducing the space occupied in the width direction.

[0227] The spring piece 23 and the elastic arm 232 of this structure can fully utilize the hollow area between the outer frame 230 and the inner frame 231, so that the width and length of the elastic arm 232 can be made larger, which is beneficial to ensure the vibration stability of the bone magnetic circuit component 21. Figure 33a and Figure 33b As shown, Figure 33a and Figure 33b Simulation diagrams of the first-order mode and the second-order mode of the bone conduction sound-generating device 2 using the shrapnel 23 of an embodiment are respectively shown. As can be seen from the figure, the resonant frequency of the first-order mode is 181.4 Hz, and the resonant frequency of the second-order mode is 1299.2 Hz. The two are far apart, and the second-order mode has little effect on the first-order mode, which is beneficial to reducing rolling vibration, alleviating vibration imbalance, avoiding THD increase and reducing noise.

[0228] In some embodiments, the length of the elastic arm 232 is in the range of 12 to 18 mm, where the length of the elastic arm 232 refers to the length of its center line. Figure 29bThe arm width W2 of the middle portion of the elastic arm 232 is 0.7 to 1 mm. The middle portion refers to the portion of the elastic arm 232 excluding the outer connecting portion 2321 and the inner connecting portion 2320. The arm width refers to the width of the narrowest part of the middle portion. A wider arm width W2 can improve the overall strength and rigidity of the spring clip 23, making it more resistant to wear and fatigue during long-term use, reducing local stress concentration, thereby extending its service life, and preventing permanent deformation or damage when subjected to external forces, thereby enhancing reliability. The arm width W2 can further be selected to be 0.8 to 0.95 mm to further ensure the effect. Optionally, the ratio of the sum of the areas of all the elastic arms 232 of the spring clip 23 to the area of ​​the hollow area between the outer frame 230 and the inner frame 231 is 0.9 to 1.3. A larger ratio allows for more efficient utilization of the area between the outer frame 230 and the inner frame 231, which in turn facilitates increasing the length of the elastic arm 232, thereby reducing F0 and improving low-frequency sound quality. Further optionally, the sum of the areas of all the elastic arms 232 accounts for a ratio of 0.2 to 0.4 of the total area of ​​the spring 23. The area of ​​the elastic arm 232 can be understood as the area of ​​its projection area along the axis of the spring 23 on a plane perpendicular to the axis. The total area of ​​the spring 23 refers to the area of ​​the area enclosed by the outer contour of the spring 23. There is no need to remove the hollowed-out part. The sum of the areas of all the elastic arms 232 is set to account for a ratio of 0.2 to 0.4 of the total area of ​​the spring 23, which is conducive to ensuring the area of ​​the inner frame 231 and the outer frame 230 and ensuring the firmness of the connection. Further optionally, the sum of the areas of all the elastic arms 232 accounts for a ratio of 0.25 to 0.35 of the total area of ​​the spring 23. Optionally, the minimum width W9 of the long side 2300 of the outer frame 230 (excluding the influence of the hollow hole 2301 on the width, that is, the missing width due to the hollow hole 2301 needs to be included in the width) is 1 to 1.3 mm. Optionally, the ratio of the minimum width W9 to the arm width W2 is 1.2 to 1.5 to ensure the reliability of the connection between the outer frame 230 and the bone conduction bracket 20.

[0229] Optionally, the area of ​​the inner frame 231 is 4 to 8 mm 2The inner frame 231 has a moderate area, which is conducive to providing sufficient space for the elastic arm 232, thereby helping to reduce F0 and improve low-frequency sound quality; at the same time, the inner frame 231 has sufficient area for welding or bonding with the bone magnetic circuit component 21, which is conducive to ensuring the firmness of the welding. Optionally, when the inner frame 231 and the bone magnetic circuit component 21 are connected by welding, the welding method can be, for example, spot welding or wire welding, preferably wire welding. Wire welding can reduce welding slag, thereby preventing welding slag from entering the interior of the product to generate noise, and the welding strength is stronger than spot welding or bonding, which is conducive to enhancing reliability. The area of ​​the welding area cannot be too large, otherwise micro-welding is not easy to control and welding slag is easily generated. The area of ​​the welding area cannot be too small. Too small a welding area will result in a weak weld. Optionally, the ratio of the area of ​​the welding area of ​​the inner frame 231 to the area of ​​the inner frame 231 is 0.15 to 0.3 to ensure welding strength. Alternatively, the area of ​​the welding region of the inner frame 231 (ie, the area of ​​the weld) is 0.8 to 1.5 mm. 2 , welding area is 0.8~1.5mm 2 This range provides sufficient connection area, ensuring sufficient strength in the weld zone and preventing loosening or disconnection due to vibration or other external forces during use. It helps disperse heat during welding, preventing localized overheating and material damage, while ensuring the quality and reliability of the weld zone. It also disperses stress and reduces stress concentration, thereby improving the fatigue strength and service life of the weld zone.

[0230] It can be understood that the longer the length of the elastic arm 232 is, the more conducive it is to reducing the K value (stiffness coefficient) of the shrapnel 23. In some embodiments, the K value (stiffness coefficient) of a single shrapnel 23 ranges from 1000N / m to 3000N / m, and the K value range of the two shrapnel 23 combined is 2000N / m to 6000N / m. Further optionally, the K value of a single shrapnel 23 ranges from 1500N / m to 2500N / m, and the K value range of the two shrapnel 23 combined is 3000N / m to 5000N / m. The stiffness coefficient of the shrapnel 23 affects the low-frequency F0 of the bone conduction sound-generating device 2. By setting the above range, it is beneficial to obtain a more suitable low-frequency F0 range (100Hz to 300Hz), so that the bone conduction sound-generating device 2 has a good low-frequency effect. For example, referring to Figure 32 By combining two springs 23, the K value range is set to 2000 N / m to 6000 N / m, and the mass of the oscillator of the bone conduction sound generator 2 is set to 2 to 2.8 g. This allows the F0 of the bone conduction sound generator 2 to be between 100 and 300 Hz. Specifically, the F0 shown in the figure is between 130 and 280. The stiffness coefficient of the spring 23 can be adjusted by controlling its wall thickness, the size of the elastic arm 232, and the spring material.

[0231] like Figure 29b As shown, the connection between the elastic arm 232 and the outer frame 230 and the inner frame 231 is transitioned through an inwardly concave arc surface 233 to reduce stress concentration. The arc surface 233 has a concave point in the width direction of the spring piece 23. The concave point of the arc surface 233 at the inner connection part 2320 is a first concave point 2330, and the concave point of the arc surface 233 at the outer connection part 2321 is a second concave point 2331. Figure 34 A stress simulation diagram of the spring clip 23 is shown. During the simulation, the inner frame 231 deviates downward by 0.5 mm relative to its original position. As can be seen from the figure, the maximum stress of the spring clip 23 is 773.8 MPa near the second concave point 2331. Its maximum stress is relatively small. Transitioning the connection between the elastic arm 232 and the outer frame 230 and the inner frame 231 through the arc surface 233 is beneficial to reducing stress concentration and ensuring the reliability of the use of the spring clip 23.

[0232] Optional, reference Figure 29c The two arc surfaces 233 on both sides of the outer connection portion 2321 are circular arc surfaces, and the radius R6 of the arc surface 233 facing the inner frame 231 is greater than the radius R7 of the arc surface 233 facing the outer frame 230 .

[0233] In some embodiments, reference Figure 29b and Figure 29c , Figure 29c The dashed lines in the figure illustrate the approximate boundaries of the various components of the elastic arm 232. The outer connecting portion 2321 of the elastic arm 232 includes a first portion 2323. The elastic arm 232 also includes a second portion 2324 connected to the inner connecting portion 2320, and a curved portion 2322 connected between the first portion 2323 and the second portion 2324. The first portion 2323 is disposed opposite the short side 2302, and the second portion 2324 is disposed opposite the long side 2300. The inner connecting portion 2320 is curved, such as a U-shape, and after bending, it connects to the end of the inner frame 231 facing away from the first portion 2323. The curved portion 2322 is disposed opposite the corner 2304 of the outer frame 230. The length L13 of the elastic arm 232 along the length direction of the spring sheet 23 is greater than its length L14 along the width direction of the spring sheet 23. Optionally, the ratio of length L13 to length L14 is 1.2 to 2.2. This prevents the length of the elastic arm 232 along the length direction of the spring sheet 23 from being much greater than its length along the width direction, thereby ensuring balanced vibration. The length L13 can be, for example, 7 to 12 mm, and the length L14 can be, for example, 4 to 7 mm. Optionally, the radius R8 of the curved portion 2322 is 1.8 to 3.4 mm to ensure balanced force and vibration of the spring sheet 23. The radius of the curved portion 2322 refers to the radius at its centerline.

[0234] Optional, reference Figure 29a, the inner wall 2305 of the corner portion 2304 and the outer wall 2326 of the curved portion 2322 are equidistant to fully utilize the space and increase the length of the connecting arm 232. In other embodiments, such as Figure 40 As shown, the inner wall 2305 of the corner 2304 can be smaller than the radius of the outer wall 2326 of the curved portion 2322.

[0235] Optionally, in some embodiments, reference Figure 29a The radius of the outer wall 2306 of the corner 2304 is greater than the radius of the inner wall 2305. In other embodiments, the radius of the outer wall 2306 of the corner 2304 is smaller than the radius of the inner wall 2305. Further, optionally, the ratio of the radius of the inner wall 2305 to the radius of the outer wall 2306 is 1.2 to 1.6. The larger radius of the inner wall 2305 can make the width of the transition between the length and width of the outer frame 230 of the spring clip 23 larger, which is beneficial to improving the strength of the spring clip and improving reliability.

[0236] In some embodiments, reference Figure 29c The angle α6 between the inner side wall of the first portion 2323 and the inner side wall of the second portion 2324 is 80° to 100°. Here, the inner side wall refers to the surface facing the inner frame 231. The angle α6 can further be selected from 85° to 95°, and can further be selected as 90°. When the spring sheet 23 is subjected to force, if the angle between the length direction and the width direction of the elastic arm 232 is close to a right angle, it can more evenly disperse and withstand the external force, reduce stress concentration, thereby reducing the possibility of local deformation and damage, and extending the service life of the spring sheet. Optionally, the first portion 2323 extends along the width direction of the spring sheet 23, which is parallel to the width direction, and the second portion 2324 extends along the length direction of the spring sheet 23, which is parallel to the length direction. The side walls of the first portion 2323 and the second portion 2324 are both planar.

[0237] A first line 2332 parallel to the width of the spring is formed through the first concave point 2330, and a second line 2333 parallel to the length of the spring is formed through the second concave point 2331. The connection width W3 between the inner connecting portion 2320 and the inner frame 231 is 1.5 to 3 mm, where the connection width W3 refers to the width of the inner connecting portion 2320 at the first line 2332. The connection width W5 between the outer connecting portion 2321 and the outer frame 230 is 1.5 to 3 mm, where the connection width W5 refers to the width of the outer connecting portion 2321 at the second line 2333. The overall strength of the spring 2 is improved. Furthermore, the width of the middle portion of the elastic arm 232 is smaller than the connection width, which can reduce F0 and enhance low-frequency effects. The stress at the connection between the elastic arm 232, the inner frame 231, and the outer frame 230 is greater than that in other areas. By widening the connection width to increase strength, severe deformation of the elastic arm 232 can be prevented. Optionally, the ratio of the connection width W3 to the connection width W5 is greater than or equal to 0.8 and less than or equal to 1.2, the width W3 at the connection between the inner connection part 2320 and the inner frame 231 is close to the width W5 at the connection between the outer connection part 2321 and the outer frame 230, and the strength of the connection between the inner connection part 2320 and the inner frame 231 and the connection between the outer connection part 2321 and the outer frame 230 are close, which is beneficial to prevent premature fatigue fracture at a certain point due to excessive strength difference, thereby ensuring the service life of the shrapnel 23.

[0238] In some embodiments, the ratio of the connection width W3 between the inner connecting portion 2320 and the inner frame 231 to the width W10 of the inner frame 231 is 0.65 to 0.9. The ratio of the connection width W3 to the width of the inner frame 231 is relatively large, which can increase the connection strength and make the inner frame 231 less likely to tilt and less likely to roll during vibration, thereby helping to ensure the sound effect of the bone conduction sound-generating device 2.

[0239] Optionally, the ratio of the minimum width of the long side 2300 of the outer frame 230 to the minimum width of the short side 2302 (excluding the effect of the hollow hole on the width) is 0.9 to 1.1, and can further be 1. Maintaining relatively consistent widths of the long and short sides is beneficial to maintaining vibration balance and suppressing rolling vibration.

[0240] In some embodiments, the outer frame 230 of the shrapnel 23 is provided with a hollow hole 2301, which can reduce the mass of the shrapnel 23, thereby reducing the mass and density of the entire bone conduction sound-generating device 2. In addition, when the shrapnel 23 and the bone conduction bracket 20 are connected by gluing, the hollow hole 2301 can serve to contain the overflow of glue, making the glue layer between the shrapnel 23 and the bone conduction bracket 20 more uniform and the connection more secure. When the sound-generating unit is hit, the shrapnel 23 is not easy to fall off. Optionally, the hollow hole 2301 accounts for 1.5% to 5% of the area enclosed by the outer contour of the shrapnel 23 to achieve a better weight reduction effect. The total area of ​​all the hollow holes 2301 can be, for example, 2.5 to 6 mm. 2 . The number of hollow holes 2301 can be, for example, 2 to 10, and can further be 4 to 8. The shape of the hollow hole 2301 can be, for example, circular, triangular, square, elliptical, runway-shaped, etc. It can be a closed hole, or it can be connected to the inner wall or outer wall of the outer frame 230. Optionally, the area of ​​a single hollow hole 2301 is 0.3 to 0.6 mm2. When the hollow hole 2301 is circular, the diameter range of the circle can be selected to be 0.5 to 0.9 mm; when the notch is rectangular or elliptical, the length and width ranges can be 0.6 to 1.6 mm and 0.2 to 0.6 mm respectively (where the length of the ellipse is the distance between the two farthest points in the length direction). If the hollow hole 2301 is too small, it will not be conducive to reducing the quality. If it is too large, it will affect the strength of the shrapnel 23. The area of ​​a single hollow hole 2301 is set to 0.3 to 0.6 mm 2 , which is beneficial to reducing weight while ensuring the strength of the spring piece 23. It is understandable that the areas and shapes of the hollow holes 2301 on the same spring piece 23 can be different.

[0241] Figure 29b 、 Figures 35a to 35d Various spring pieces 23 with hollow holes 2301 are shown. Figure 29b In the embodiment, the spring piece 23 is provided with a racetrack-shaped hollow hole, and the length direction of the hollow hole 2301 on the long side 2300 and the short side 2302 is perpendicular to the extension direction of the corresponding side. Figure 35a In the embodiment, the spring piece 23 is provided with a racetrack-shaped hollow hole 2301 and a circular hollow hole 2301 . Figure 35b and Figure 35c In the embodiment, the spring piece 23 is provided with a triangular hollow hole 2301. Figure 35b The hollow hole 2301 in the middle portion is connected to the inner wall of the outer frame 230 . Figure 35d In the embodiment, the spring piece 23 is provided with a circular hollow hole 2301. Optionally, the long side 2300, the short side 2302 and the corner 2304 of the outer frame 230 are all provided with hollow holes 2301 to better play the role of containing glue.

[0242] In some embodiments, as Figure 29aand Figure 29b As shown, the outer circumferential surface 23a of the outer frame 230 of the spring clip 23 is provided with outwardly protruding portions 234. These portions are provided on at least the two long sides 2300 of the spring clip 23. Optionally, the portions 234 are provided on both the long sides 2300 and the short sides 2302. Furthermore, the portions 234 on the two long sides 2300 are symmetrically arranged, and the portions 234 on the two short sides 2302 are also symmetrically arranged. After the spring clip 23 is mounted on the bone conduction stent 20, the portions 234 also protrude from the outer circumferential surface of the bone conduction stent 20.

[0243] The outward projection distance of the protrusion 234 can be, for example, 0.05 to 0.2 mm, and the length L15 of the protrusion 234 can be, for example, 1 to 2 mm, to provide a good positioning effect and reduce space usage. Optionally, at least one protrusion 234 is provided on both the long side 2300 and the short side 2302 of the outer frame 230, and the ratio of the length L15 of the protrusion 234 on the long side 2300 to the length L15 of the protrusion 234 on the short side 2302 is 0.85 to 1.15, further preferably 0.95 to 1.05, and further preferably 1. The dimensions of the positioning features on the long and wide sides are consistent, which facilitates positioning.

[0244] In some embodiments, the outer frame 230 and the inner frame 231 of the spring 23 are flush, which is more convenient for manufacturing. Figure 36 and Figure 37 , Figure 36 and Figure 37 They are schematic cross-sectional views of two different cross-sections of a spring piece according to an embodiment, wherein: Figure 36 The cross section passes through the center of the inner frame 231 and is perpendicular to the width direction of the spring. Figure 37 The cross-section of the outer frame 230 and inner frame 231 of the spring clip 23 passes through the center and is perpendicular to the length of the spring clip. The outer frame 230 and inner frame 231 of the spring clip 23 are spaced apart along the thickness direction of the spring clip 23 (aligned with the vibration direction A). When the spring clip 23 is installed on the bone conduction bracket 20, the inner frame 231 is recessed into the bone conduction bracket 20 relative to the outer frame 230, placing it closer to the bone magnetic circuit assembly 21. This allows the bone conduction bracket 20 to extend further beyond the bone magnetic circuit assembly 21 along the vibration direction A, resulting in better magnetic conduction and reduced magnetic flux leakage. Furthermore, when the bone magnetic circuit assembly 21 vibrates, less of it extends beyond the bone conduction bracket 20, reducing the risk of the vibrator striking external components. Optionally, the spacing D11 between the outer frame 230 and inner frame 231 is 0.35 to 0.8 mm, and further optionally 0.4 to 0.65 mm.

[0245] Optionally, the spacing D11 between the outer frame 230 and the inner frame 231 is greater than the maximum amplitude of the bone conduction magnetic circuit assembly 21 when the bone conduction sound device 2 is in operation. This means that when the bone conduction sound device 2 is in operation, the inner frame 231 does not extend beyond the upper end surface of the outer frame 230, preventing the spring 23 from striking the outer area of ​​the bone conduction sound device 2 and generating noise. This facilitates installation of the bone conduction sound device 2 and eliminates the need for clearance space at either end in the vibration direction. The maximum amplitude refers to the maximum single-sided vibration amplitude of the spring 23 within the frequency range of 20 Hz to 20 kHz when a 0.5 Vrms voltage is input to the bone conduction sound device 2. In some embodiments, the maximum amplitude of the bone conduction magnetic circuit assembly 21 during operation is 0.2 to 0.7 mm. In this case, the spacing D11 between the outer frame 230 and the inner frame 231 can be 0.35 to 0.8 mm. If the maximum amplitude is too small, the sensitivity is insufficient, and if the amplitude is too large, noise is likely to be generated. Setting the maximum amplitude to 0.2-0.7 mm is beneficial for ensuring sensitivity and reducing noise. Furthermore, optionally, the maximum amplitude of the bone magnetic circuit assembly 21 during operation is 0.3-0.5 mm. In this case, the spacing distance D11 between the outer frame 230 and the inner frame 231 can be 0.4-0.65 mm. Optionally, the ratio of the spacing distance D11 to the maximum amplitude of the bone magnetic circuit assembly 21 is 1.05-1.5 to better ensure that the bone magnetic circuit assembly 21 does not extend beyond the upper end surface of the outer frame 230.

[0246] Optionally, when the spring 23 is assembled to the bone conduction sound generating device 2, as shown in FIG. Figure 36 As shown, on a cross section passing through the center of the spring piece 23 and perpendicular to the width direction of the spring piece 23, the elastic arm 232 is tilted relative to the inner frame 231. The edge of the outer frame 230 has an edge point 230a farthest from the inner frame 231. The inner frame 231 has a midpoint 231a located in the middle. The angle α4 between the line 230b connecting the edge point 230a and the midpoint 231a and the inner surface and / or outer surface of the inner frame 231 is 2 to 6 degrees. Figure 37 As shown, in a cross section passing through the center of the spring piece 23 and perpendicular to the length direction, the elastic arm 232 is inclined relative to the inner frame 231, and the angle α5 between the line 230b connecting the edge point 230a and the midpoint 231a and the inner and / or outer surface of the inner frame 231 is 5 to 10 degrees. Furthermore, the angle α4 is 3 to 5 degrees, and the angle α5 is 6 to 8 degrees. Furthermore, the angle α4 is 3.5 to 4.5 degrees, and the angle α5 is 6.5 to 7.5 degrees.

[0247] In some embodiments, after the bone conduction sound-generating device 2 is assembled, the two springs 23 are pre-tensioned, i.e., the elastic arms 232 deform toward the bone magnetic circuit assembly 21, thereby maintaining tension on the bone magnetic circuit assembly 21. The pre-tension of the springs 23 can range from 0.8 to 1.2 N. This pre-tension can make the springs 23 and the bone magnetic circuit assembly 21 more stable and less prone to swinging, thereby improving vibration stability and reducing distortion and noise. It is understood that both flat springs 23 and springs 23 spaced apart from the outer frame 230 and the inner frame 231 can be pre-tensioned.

[0248] In some embodiments, the two springs 23 at both ends of the bone conduction sound generating device 2 have the same structure, which is beneficial for the bone conduction magnetic circuit assembly 21 to maintain a balanced state. Furthermore, the two springs 23 are arranged symmetrically, which can make the bone conduction magnetic circuit assembly 21 more balanced during vibration, which is beneficial for improving the sound quality. Optionally, the projections of the inner connecting parts 2320 of the two springs 23 along the vibration direction A on a plane perpendicular to the vibration direction A do not completely overlap. Figure 38 , Figure 38 Shows two Figure 29a The schematic diagram of the top view of the spring clip 23 after installation is shown in the figure. In the figure, the two spring clips 23 are respectively shown by solid lines and dotted lines. It can be seen from the figure that the projections of the inner connecting parts of the two spring clips 23 only partially overlap. In this way, the position of the inner connecting parts is more dispersed, which is conducive to ensuring the stability of the force applied to the bone magnetic circuit assembly 21, making its vibration more balanced, and can reduce or even prevent the rolling vibration of the bone magnetic circuit assembly 21, reduce or even eliminate the collision noise, thereby improving the sound effect. Further optionally, the projections of the inner connecting parts 2320 of the two spring clips 23 along the vibration direction A on a plane perpendicular to the vibration direction A do not overlap at all, that is, there are four projections of the inner connecting parts 2320, and the projection areas of the four inner connecting parts 2320 do not overlap at all, so that the bone magnetic circuit assembly 21 can be more smoothly restricted, making its vibration more balanced. Reference Figure 39 , Figure 39 Shows two Figure 40 The schematic diagram of the top view of the spring piece 23 after installation is shown. In the figure, the two spring pieces 23 are respectively shown by solid lines and dotted lines. It can be seen from the figure that the projection areas of the inner connecting parts 2320 of the two spring pieces 23 do not overlap at all.

[0249] It is understandable that in the illustrated embodiment, the inner connection portion 2320 is offset to one side of the outer frame 230 in the width direction relative to the inner frame 231 , so that the inner connection portions 2320 of the upper and lower spring plates 23 do not completely overlap.

[0250] Next, the bone conduction magnetic circuit component 21 of the bone conduction sound generating device 2 is described with an example.

[0251] In some embodiments, reference Figure 18 The thickness B7 of the magnet 210 is 1.8 mm to 3.2 mm, and can be further selected as 2.2 mm to 2.8 mm. Figure 41 A simulation diagram shows the BL value of a bone conduction sound-generating device 2 according to an embodiment of the present disclosure when magnets 210 of different thicknesses are installed. During the simulation, the total thickness of the bone magnetic circuit assembly 21 remains constant at 3.8 mm (excluding the thickness of the boss 2113), while the thickness B7 of the magnet 210 varies. The thickness B8 of the magnetic plate 211 (also including the thickness of the boss 2113) also changes with the thickness of the magnet 210. As can be seen from the diagram, the BL value increases overall with increasing magnet 210 thickness. However, when the magnet 210 is 3.2 mm thick, the BL value decreases to a certain extent. This is because the magnet 210 becomes too thick, and the thinning of the magnetic plate 211 leads to poor magnetic permeability. It is understood that if magnet 210 is too thin, the magnetic field it provides is insufficient, while if it is too thick, the thickness of magnetic plate 211 is insufficient, resulting in poor magnetic conductivity. Thickening both magnet 210 and magnetic plate 211 will increase the thickness of bone magnetic circuit assembly 21, thereby increasing the volume and mass of bone conduction sound-generating device 2. By setting the thickness B7 of magnet 210 to 2.2 mm to 2.8 mm, a higher BL value can be provided while avoiding significant magnetic leakage. Optionally, the thickness B8 of magnetic plate 211 can be 0.3 mm to 0.8 mm (excluding the thickness of boss 2113). Further, the thickness B8 can be 0.5 mm to 0.65 mm, ensuring a suitable thickness to ensure magnetic conductivity and reduce magnetic leakage.

[0252] When the thickness of the magnet 210 is 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, and 3.2 mm, the ratio of the magnet 210 to the single magnetic conductive plate 211 is shown in the following table:

[0253] Magnet thickness Ratio of magnet to single magnetic plate 2.2mm 2.75 2.4mm 3.42 2.6mm, 4.33 2.8mm 5.6 3mm 7.5 3.2mm 10.66

[0254] Optionally, the ratio of the thickness of the magnet 210 to the magnetic plate 211 is 3 to 6. Within this ratio range, the bone magnetic circuit assembly 21 can provide a higher BL value. Further optionally, the ratio of the thickness of the magnet 210 to the magnetic plate 211 is 3.5 to 4.5 to further ensure the BL value.

[0255] In some embodiments, reference Figure 42 and Figure 43 , Figure 42 FIG2 shows a schematic structural diagram of a bone conduction sound generating device 2 according to some embodiments of the present specification. Figure 43 It is along Figure 42In the cross-sectional view taken along line FF, the sides of the magnet 210 and the magnetic conductive plate 211 are flush in the illustrated embodiment. The magnet 210 and magnetic conductive plate 211 are rectangular, with rounded corners corresponding to the four corners of the bone conduction support 20 and the bone conduction coil 22. The radius R1 of the rounded corners of the magnet 210 and magnetic conductive plate 211 ranges from 0.8 mm to 2 mm, and can further be 1 mm to 1.5 mm. This rounded corner radius helps ensure the area of ​​the magnet 210, thereby providing a larger BL value. It also prevents sharp corners from scratching the bone conduction coil 22 due to an excessively small radius R1, thereby improving operational reliability. Figure 44 A simulation diagram shows the BL value of the bone magnetic circuit assembly 21 when a bone conduction sound-generating device 2 according to one embodiment of this specification is installed with corners of varying sizes. During the simulation, all parameters remained constant, except for the corner radius of the magnet 210 and the magnetic plate 211. As can be seen from the diagram, the BL value decreases as the corner radius increases.

[0256] In some embodiments, reference Figure 18 and Figure 45 The side surface 2110 of the magnetic conductive plate 211 extends beyond the side surface 2111 of the magnet 210. This places the magnetic conductive plate 211 closer to the bone coil 22 relative to the magnet 210, facilitating the gathering of magnetic flux lines through the bone coil 22 and improving the BL value. Furthermore, the groove between the magnetic conductive plate 211 and the magnet 210 can accommodate glue. When the magnetic conductive plate 211 and the magnet 210 are glued together, the glue can overflow and be contained within the groove, thereby maintaining the overall dimensions of the bone magnetic circuit assembly 21 and preventing contact with the bone coil 22. Optionally, the distance L2 by which the area of ​​the magnetic conductive plate 211, excluding its corners, protrudes from the side surface 2111 of the magnet 210 is 0.03 to 0.1 mm, and the distance L3 between the area of ​​the magnetic conductive plate 211, excluding its corners, and the bone coil 22 is 0.15 to 0.3 mm, and can further be 0.2 to 0.25 mm.

[0257] It is understandable that the magnetic plate 211 and the bone conduction coil 22 can be arranged at equal distances. Figure 26 The outer contour of the magnetic plate 211 is in the shape of a runway, and the two end faces of the outer contour of its cross section are arc surfaces. The bone conduction coil 22 is also in the shape of a runway, and is equidistant from the magnetic plate 211. The magnetic plate 211 and the bone conduction coil 22 can also be unequally spaced. Figure 46 , Figure 46 It is along Figure 42In the cross-sectional view taken along the LL section line, the outer contours of the magnetic plate 211 and the bone coil 22 are rectangular, and the four corners of the magnetic plate 211 are rounded. The radius R1 of the rounded corners is 0.9 to 2 mm, and can further be 1.2 mm to 1.6 mm. Optionally, the distance L3 between the area of ​​the magnetic plate 211 other than the corners (for example, the distance between the two long sides and the distance between the two short sides) and the bone coil 22 is 0.15 to 0.3 mm, and the distance D10 between the bone coil 22 and the corners of the magnetic plate 211 is greater than the distance L3 between the area of ​​the magnetic plate 211 other than the corners and the bone coil 22, so as to further reduce the risk of the bone magnetic circuit assembly 21 colliding with the bone coil 22. Furthermore, the difference between the distance D10 and the distance L3 is 0.02 to 0.15 mm, so as to further ensure the anti-collision effect and the utilization efficiency of the magnetic field. Since the magnetic plate 211 is closer to the bone conduction coil 22, a larger rounded corner is beneficial to prevent it from contacting the bone conduction coil 22. Since the magnet 210 does not protrude from the magnetic plate 211, it does not need to be provided with a rounded corner, or the size of its rounded corner can be smaller than the rounded corner of the magnetic plate 211 to increase the BL value.

[0258] In some embodiments, the ratio of the projected area of ​​the magnetic plate 211 along the vibration direction A on a plane perpendicular to the vibration direction A to the projected area of ​​the bone conduction support 20 along the vibration direction A on the same plane is 0.5 to 0.7, thereby maximizing the magnetic circuit and improving magnetic field utilization. The projected area of ​​the magnetic plate 211 and the bone conduction support 20 refers to the area enclosed by their projected outer contours. The large area ratio of the magnetic plate 211 helps improve magnetic circuit efficiency, providing a stronger magnetic field over a larger area, thereby improving the efficiency of the drive coil. A stronger magnetic field helps generate greater vibrations, providing a stronger driving force, and can produce a larger amplitude, thereby increasing the volume of the sound output. It also improves energy efficiency. Higher magnetic circuit efficiency means that the device can produce a louder output volume and better sound quality with the same input power. This helps reduce overall power consumption and extend battery life, which is particularly important in portable devices.

[0259] It is understandable that the bone magnetic circuit assembly 21 can be formed by connecting multiple parts (split type) or by integral magnetization. When it is formed by connecting multiple parts, the magnet 210 and the magnetic plate 211 are independent parts, and the independent parts are connected by gluing or other means to form the bone magnetic circuit assembly 21. When the bone magnetic circuit assembly 21 is made by integral magnetization, the bone magnetic circuit assembly 21 is a separate part (integrated type), and the magnet 210 and the magnetic plate 211 are part of the part and do not need to be connected to form the bone magnetic circuit assembly 21. Therefore, the bone magnetic circuit assembly 21 formed by integral magnetization has higher dimensional accuracy. The method of integral magnetization can refer to the patent document with application number 202111062238.3, the entire content of which is incorporated herein by reference.

[0260] Next, the inductance adjustment hole 2112 on the magnetic conductive plate 211 is described with an example.

[0261] In some embodiments, at least one magnetic conductive plate 211 is provided with at least one inductance adjustment hole 2112, and the inductance adjustment hole 2112 passes through both end surfaces of the magnetic conductive plate 211 along the vibration direction A. Optionally, at least one magnetic conductive plate 211 located on the outermost side of the bone magnetic conductive circuit assembly 21 is provided with an inductance adjustment hole 2112. Further optionally, both of the two magnetic conductive plates 211 located on the outermost side of the bone magnetic conductive circuit assembly 21 are provided with inductance adjustment holes 2112, so as to make the upper and lower masses of the bone magnetic conductive circuit assembly 21 more balanced and improve the smoothness of the vibration. It is understandable that the outermost magnetic conductive plate 211 is adjacent to the spring 23. Further optionally, all of the magnetic conductive plates 211 are provided with inductance adjustment holes 2112.

[0262] like Figure 47As shown, the outer end surfaces 2116 of the two outermost magnetic conductive plates 211, facing away from the magnets 210, are provided with inductance adjustment holes 2112. These holes can be used to store glue to reduce the amount of glue that overflows onto the edges of the magnets 210 and magnetic conductive plates 211, preventing the overflowing glue from rubbing against the bone conduction coil 22 and reducing the mass of the bone conduction sound-generating device 2. The inductance adjustment holes 2112 can be shaped, for example, as a circular hole, a racetrack-shaped hole, or an elliptical hole. If circular, the diameter can range from 0.5 mm to 1.5 mm, further optionally from 0.7 mm to 1.3 mm, and further optionally from 0.8 mm to 1.2 mm. There can be one or more inductance adjustment holes 2112. By controlling the number and area of ​​the inductance adjustment holes 2112, the mass of the bone conduction sound-generating device 2 can be adjusted. Optionally, the shortest distance L12 between the edge of the inductance adjustment hole 2112 and the outer edge of the magnetic conductive plate 211 is 0.5 to 1.5 mm to prevent the edge from being too narrow, resulting in the strength of the magnetic conductive plate 211 being too weak. In addition, the inductance adjustment hole 2112 is close to the edge, which is conducive to improving the glue storage effect and preventing glue from overflowing from the edge of the magnetic conductive plate 211. The shortest distance L12 can be further selected to be 0.7 to 1.2 mm to further achieve a better balance between the structural strength of the magnetic conductive plate 211 and the glue storage effect.

[0263] The inductance adjustment hole 2112 can reduce the inductance of the bone conduction coil 22. Figure 48 As shown, Figure 48 A graph shows how the inductance of the bone conduction coil 22 changes with the number of inductance adjustment holes 2112. In the graph, the inductance adjustment holes 2112 are circular and have a diameter of 1 mm. The area of ​​a single inductance adjustment hole 2112 accounts for 1% of the area of ​​the magnetic plate 211. The area of ​​the magnetic plate 211 refers to the area enclosed by its outer contour. As can be seen from the graph, when there are four inductance adjustment holes 2112 (at this time, the total area of ​​all inductance adjustment holes 2112 accounts for 4% of the area of ​​the magnetic plate 211), the inductance is minimal. The smaller the inductance, the more conducive it is to improving high-frequency sensitivity. Optionally, the total area of ​​all inductance adjustment holes 2112 accounts for 3% to 8% of the area of ​​the magnetic plate 211, so that the bone conduction coil 22 has a lower inductance, thereby improving high-frequency sensitivity and enhancing the sound effect. Furthermore, the total area of ​​all inductance adjustment holes 2112 accounts for 3% to 6% of the area of ​​the magnetic plate 211 to further ensure the effect.

[0264] In some embodiments, the magnetic conductive plate 211 is provided with at least two inductance adjustment holes 2112, and the inductance adjustment holes 2112 correspond to the hollowed-out portions of the spring 23. In the vibration direction, at least two of the inductance adjustment holes 2112 are not blocked by the spring 23. Optionally, all of the inductance adjustment holes 2112 are arranged symmetrically about the center of the magnetic conductive plate 211. For example, when there are two inductance adjustment holes 2112, they can be arranged at diagonally opposite corners of the magnetic conductive plate 211. The symmetrical arrangement of the inductance adjustment holes 2112 can prevent uneven vibration caused by uneven mass of the bone magnetic conductive circuit assembly 21, while making the magnetic lines of force more symmetrical, which is also conducive to vibration balance. Figure 49 for Figure 17 The top view of the bone conduction sound generating device 2 is shown. Figure 49 In the illustrated embodiment, the two inductance adjustment holes 2112 are exposed from the spacing area between the two elastic arms 232 . Specifically, the inductance adjustment holes 2112 are exposed from the spacing area between the first portion 2323 of one elastic arm 232 and the inner connecting portion 2320 of the other elastic arm 232 .

[0265] like Figure 29c As shown, along the length direction of the spring 23, a minimum spacing D3 is defined between the first portion 2323 of one elastic arm 232 and the other elastic arm 232. Along the width direction of the spring 23, a minimum spacing D4 is defined between the second portion 2324 of one elastic arm 232 and the other elastic arm 232. The ratio of the minimum spacing D3 to the minimum spacing D4 ranges from 2 to 6, and can further be 3 to 5. This creates a relatively large spacing between the first portion 2323 and the inner connecting portion 2320. Due to the large spacing between the first portion 2323 and the inner connecting portion 2320, the inductance adjustment hole 2112 is easily exposed. The inductance adjustment hole 2112 can be used to position the bone magnetic circuit assembly 21 and the bone conduction support 20 during assembly, preventing the bone magnetic circuit assembly 21 from deflecting. During assembly, the positioning tool is equipped with a positioning cavity for positioning the bone conduction bracket 20 and a positioning post corresponding to the inductance adjustment hole 2112. The bone conduction bracket 20 is positioned in the positioning cavity, and the positioning post extends into the inductance adjustment hole 2112 to position the bone conduction magnetic circuit assembly 21, thereby ensuring the positional accuracy of the bone conduction magnetic circuit assembly 21 and the bone conduction bracket 20. This allows the spring clip 23 to be welded on the top. After the spring clip 23 is welded, the bone conduction bracket 20 is flipped so that the bone conduction bracket 20 is positioned in the positioning cavity. The positioning post passes through the spring clip 23 below and extends into the inductance adjustment hole 2112 to position the bone conduction magnetic circuit assembly 21. At this point, another spring clip 23 can be welded. This helps ensure the assembly accuracy of the bone conduction sound generating device 2. Optionally, the number of inductance adjustment holes 2112 is two or four, and the multiple inductance adjustment holes 2112 are symmetrically arranged about the axis of the bone conduction magnetic circuit assembly 21.

[0266] Next, the connection between the bone magnetic circuit assembly 21 and the inner frame 231 is described with an example.

[0267] In some embodiments, the bone conduction circuit assembly 21 includes a spacer connected to the inner frame 231. The spacer separates the outer end surface 2116 of the magnet assembly (the assembly formed by the connection of the magnet 210 and the magnetic plate 211) facing the inner frame 231 from the inner frame 231. This allows for a larger radial dimension of the magnet assembly and prevents the elastic arm 232 from contacting the magnet assembly during vibration, causing collision noise. In embodiments where the inner frame 231 and outer frame 230 of the spring 23 are spaced apart along the vibration direction A, the inner frame 231 can be directly connected to the magnetic plate 211 without a spacer. It will be appreciated that the spacer can increase the distance D15 that the bone conduction support 20 extends beyond the outer end surface 2116 of the outermost magnetic plate 211 along the vibration direction A, thereby reducing magnetic flux leakage. Optionally, along the vibration direction A, the distance D15 by which the bone conduction support 20 extends beyond the outer end surface 2116 of the outermost magnetic conductive plate 211 is 0.4 to 1.5 mm. This effectively reduces magnetic flux leakage and allows more magnetic flux lines to pass through the bone conduction support 20, reducing magnetic flux dispersion and thereby increasing the BL value. Furthermore, optionally, the distance D15 by which the bone conduction support 20 extends beyond the outer end surface 2116 of the outermost magnetic conductive plate 211 is 0.5 to 1.2 mm. This ensures magnetic flux leakage prevention without excessively increasing the volume of the bone conduction sound generating device 2. The distance D15 by which the bone conduction support 20 extends beyond the outermost magnetic conductive plate 211 can be adjusted using spacers, or by adjusting the offset between the inner frame 231 and the outer frame 230 of the spring 23, or by a combination of these two methods or other methods.

[0268] The thickness of the spacer can be 0.2 to 0.5 mm, so as to ensure a reasonable distance between the elastic arm 232 and the outer end surface 2116 to prevent the generation of noise. The shape of the spacer can be circular, oval, rectangular or runway-shaped, and the material can be plastic or stainless steel. Optionally, the area range of the spacer is 2 mm 2 ~10mm 2 Between, further optional 4mm 2 ~6mm 2 The area of ​​the spacer should not be too large, otherwise it will take up too much space, resulting in insufficient cantilever space for the spring, too short an arm length of the elastic arm 232, and too high a K value for the spring 23; too small an area of ​​the spacer means that the bonding area or welding area is too small, and the assembly is not strong enough. Use 2mm 2 ~10mm 2The area of ​​the spacer can leave enough space for the vibration of the spring piece 23, and can also ensure the connection area between the spring piece 23 and the magnetic plate 211. Optionally, the ratio of the area of ​​the spacer to the area of ​​the magnetic plate 211 is between 0.03 and 0.1, and can be further optionally between 0.05 and 0.08. The area of ​​the magnetic plate 211 refers to the area of ​​the area enclosed by its outer contour. In some embodiments, the ratio of the thickness of the spacer to the thickness of a single magnet 210 is 0.07 to 0.2, and the thickness of the magnet 210 is much larger than the thickness of the spacer, which is beneficial to increase the volume of the magnet 210 and improve the BL value. In some embodiments, the area of ​​the spacer is the same as the shape and area of ​​the inner frame 231 to provide a better connection effect.

[0269] In some embodiments, as Figure 18 As shown, the spacer is a boss 2113 protruding from the middle of the magnetic plate 211. The boss 2113 is integrally formed with the magnetic plate 211 and protrudes from the outer end surface 2116 of the magnetic plate 211 (see the reference numerals). Figure 45 ), optionally, a boss 2113 is formed by stamping the middle part of the magnetic conductive plate 211, and a recess 2114 is formed at a position corresponding to the boss 2113 on the surface of the magnetic conductive plate 211 facing away from the boss 2113 (i.e., the inner end face 2115). It can be understood that the stamping process can efficiently form the boss 2113 and the recess 2114 at the same time, but it does not mean that only stamping can be used to form the boss 2113 and the recess 2114. The boss 2113 is connected to the inner frame 231, for example, by welding or bonding. The welding method is generally more secure than bonding. The protruding height H1 of the boss 2113 (i.e., the thickness of the spacer) is 0.2 to 0.5 mm, thereby ensuring a reasonable distance between the elastic arm 232 and the boss 2113 to prevent the generation of noise. Optionally, the depth H2 of the recess 2114 is 0.2-0.5 mm, and the recess 2114 can be used to store glue, further reducing the glue overflowing to the edge when gluing the magnetic plate 211 and the magnet 210 together, causing collision noise with the bone conduction coil 22.

[0270] In some embodiments, reference Figure 50 The spacer is a gasket 26 connected to the magnetic plate 211 and the inner frame 231. The gasket 26 forms a gap between the elastic arm 232 and the magnetic plate 211. At this time, the magnetic plate 211 can be flat and not provided with a recess 2114 to simplify the processing process. Of course, a recess 2114 can also be provided. The gasket 26 can be made of a magnetic material or a non-magnetic material, such as plastic or metal. The gasket 26 and the inner frame 231 can be connected by welding, bonding, or hot melt columns. For example, the gasket 26 is provided with a hot melt column that passes through the inner frame 231, and the gasket 26 and the inner frame 231 are fixed by hot melt columns. The thickness H3 of the gasket 26 is the thickness of the spacer.

[0271] Next, the bone conduction coil 22 of the bone conduction sound generating device 2 and its installation method are described with examples.

[0272] refer to Figure 45 The bone conduction coil 22 is fixed relative to the bone conduction support 20 and is arranged corresponding to the magnetic plate 211 in the vibration direction A. The ends of the bone conduction coil 22 along the vibration direction A extend beyond the ends of the magnetic plate 211 along the vibration direction A. That is, the ends of the bone conduction coil 22 extend beyond the outer end surface 2116 and the inner end surface 2115 of the magnetic plate 211. This allows the magnetic flux lines gathered by the magnetic plate 211 to pass through the bone conduction coil 22 in a concentrated manner, thereby improving magnetic field utilization. Optionally, the distance D5 between the end surfaces 221 of the bone conduction coil 22 and the magnetic plate 211 along the vibration direction A is 0.4 to 0.8 mm. Distance D5 refers to the distance between the two end surfaces of the bone conduction coil 22 and the magnetic plate 211 facing the same direction. Distance D5 is greater than the maximum amplitude of the bone magnetic circuit assembly 21 when the bone conduction sound generating device 2 is in operation. During normal operation of the bone conduction sound generating device 2, the magnetic plate 211 never extends upward or downward beyond the bone conduction coil 22 along the vibration direction A, thereby improving driving efficiency. Furthermore, optionally, the bone coil 22 extends farther from the inner end surface 2115 of the magnetic plate 211 than from the outer end surface 2116 of the magnetic plate 211. Because the density of magnetic flux lines near the magnet 210 is higher, this arrangement can further increase the density of magnetic flux lines passing through the bone coil 22, thereby improving driving efficiency. Optionally, the difference in distance between the two ends of the bone coil 22 and the two end surfaces of the magnetic plate 211 is 0.1 to 0.3 mm.

[0273] Figure 51A simulation diagram shows the BL value of a bone conduction sound-generating device 2 according to one embodiment of this specification when bone conduction coils 22 of different heights are installed. During the simulation, the height of the bone conduction coil 22 varies, while other component parameters remain unchanged. As can be seen from the diagram, the BL value generally increases as the height H4 of the bone conduction coil 22 increases. In some embodiments, the height H4 of the bone conduction coil 22 is 1.5 to 2.5 mm, and the wall thickness B3 of the bone conduction coil 22 is 0.35 to 0.6 mm. Optionally, the ratio of the height H4 of the bone conduction coil 22 to the wall thickness B3 of the bone conduction coil 22 ranges from 3.5 to 4.5. The wall thickness B3 of the bone conduction coil 22 is as small as possible, so that the magnetic field passing through the bone conduction coil 22 can be more uniform. The height H4 of the bone conduction coil 22 is relatively high, so that the magnetic field generated by the bone magnetic circuit assembly 21 can be more fully utilized, which is beneficial to improving sensitivity. However, the farther away from the magnetic plate 211, the sparser the magnetic flux lines. After a certain height, continuing to increase the height of the bone conduction coil 22 will reduce the effectiveness of improving sensitivity, and too high a height may lead to a waste of space. Setting the ratio of the height H4 of the bone conduction coil 22 to the wall thickness B3 of the bone conduction coil 22 in the range of 3.5 to 4.5 is beneficial to achieving a better balance between space utilization and improving sensitivity.

[0274] In some embodiments, the ratio of the sum of the thicknesses of all the magnetic conductive plates 211 to the height h of the bone conduction bracket 20 is 0.15 to 0.4, which can ensure the size of the relatively concentrated and uniform portion of the magnetic field between the bone magnetic circuit assembly 21 and the bone conduction bracket 20, thereby increasing the vibration stability of the bone conduction sound generating device 2 and improving the sensitivity.

[0275] In some embodiments, the resistance of each bone conduction coil 22 is 3.5-4.5 ohms, and the series resistance of the two coils is 7-9 ohms. Using resistors within this resistance range does not overload audio equipment such as amplifiers, ensuring the stability and lifespan of the audio system. This also achieves a good balance in sound quality.

[0276] The bone conduction coil 22 is obtained by winding. In some embodiments, the bone conduction coil 22 has an even number of radial winding layers, and the number of winding layers of the bone conduction coil 22 is 2 to 6 layers, for example, two layers, four layers, or six layers. Figure 52 The figure shows a situation in which the number of winding layers of an embodiment is four. The dotted line with an arrow indicates the order in which each turn is formed during winding. When winding, the innermost layer is first wound from bottom to top (or from top to bottom) along the coil axis, and then the adjacent layer is wound from top to bottom (or from bottom to top), and multiple layers are wound in sequence. When the number of layers is an even number, the two leads 220 of the bone conduction coil 22 can be adjacent to each other, thereby facilitating the wire exit from the wire exit hole 201. Optionally, the number of turns of the layer close to the inner side of the bone conduction coil 22 is greater than or equal to the number of turns of the layer close to the outer side. For example, referring to Figure 52The number of turns between every two adjacent layers is the same, and the number of turns between every two adjacent layers differs by one turn. The innermost layer has one more turn than the adjacent layer. For another example, the number of turns in each layer of the bone conduction coil 22 gradually decreases toward the outside. Optionally, the number of turns in each outer layer is one less than the number of turns in the adjacent inner layer. In this way, each outer turn is located between the two inner turns, making the winding more stable, but the total length of the coil will be reduced. It is understood that the resistance, length, wall thickness, volume, and other parameters of the bone conduction coil 22 can be adjusted by the number of turns of the bone conduction coil 22.

[0277] In some embodiments, reference Figure 42 , the bone conduction coil 22 is directly attached to the inner wall of the bone conduction bracket 20, and the two bone conduction coils 22 are spaced apart along the vibration direction A. In order to facilitate the limitation of the distance between the two bone conduction coils 22, in other embodiments, reference Figure 45 and Figure 53 The bone conduction sound generating device 2 also includes a coil bobbin 27, with two bone conduction coils 22 connected to both ends of the coil bobbin 27. The coil bobbin 27 can be assembled into a single unit with the bone conduction coils 22 and then installed within the bone conduction support 20. Alternatively, the coil bobbin 27 and the bone conduction support 20 can be fixedly connected first, and then the bone conduction coils 22 can be installed on the coil bobbin 27. The bone conduction coils 22 are connected to the end surfaces of the coil bobbin 27. For example, glue can be applied between the bone conduction coils 22 and the bone conduction support 20, and between the bone conduction coils 22 and the coil bobbin 27 to secure the bone conduction coils 22. The coil bobbin 27 can separate and position the two bone conduction coils 22, ensuring a more accurate distance between them and, in turn, ensuring a more accurate relative position between the bone conduction coils 22, the magnetic plate 211, and the bone conduction support 20. The height H5 of the coil bobbin 27 is 0.5 mm to 1.5 mm. Optionally, the ratio of the height of the coil bobbin 27 to the bone conduction coil 22 is 0.3 to 0.7. This provides optimal strength to support the bone conduction coil 22 while minimizing the height of the bone conduction coil 22, thereby improving performance and stability. The height H5 of the coil bobbin 27 can further be 0.8 mm to 1.2 mm, and the ratio of the height of the coil bobbin 27 to the bone conduction coil 22 can further be 0.4 to 0.6 to further ensure optimal performance. It will be appreciated that the height H5 of the coil bobbin 27 controls the distance D15 that the bone conduction support 20 extends beyond the outer end surface 2116 of the outermost magnetic conductive plate 211, ensuring dimensional accuracy.

[0278] In some embodiments, the coil frame 27 is made of magnetic conductive material, such as Figure 45As shown, the coil bobbin 27 does not protrude from the bone conduction coil 22 toward the side of the bone conduction circuit assembly 21. Optionally, the coil bobbin 27 is annular, with an inner diameter greater than or equal to the inner diameter of the bone conduction coil 22. Since the coil bobbin 27 does not protrude from the bone conduction coil 22, the attraction between the bone conduction circuit assembly 21 and the coil bobbin 27 is reduced, thereby reducing vibration imbalance or noise caused by the bone conduction circuit assembly 21 being attracted by the coil bobbin 27. Optionally, the distance D6 between the inner surface 270 of the coil bobbin 27 and the inner surface 222 of the bone conduction coil 22 (i.e., the distance the coil bobbin 27 is recessed into the inner surface 222 of the bone conduction coil 22) is 0.05 to 0.2 mm, which helps prevent the bone conduction circuit assembly 21 from becoming stuck to the coil bobbin 27 and causing malfunction. The distance D6 can further be 0.1 to 0.2 mm for improved reliability.

[0279] In other embodiments, the coil bobbin 27 is made of a non-magnetic material, such as plastic, including but not limited to PC, PEI, PP, ABS, PA, ABS, PC+ABS, and PC+glass fiber. Using a non-magnetic coil bobbin 27 can prevent the bone magnetic circuit assembly 21 from being attracted by the coil bobbin 27, causing vibration imbalance or noise. It can also prevent the bone magnetic circuit assembly 21 from becoming stuck to the coil bobbin 27, causing malfunction, thereby improving operational reliability. In addition, compared to a magnetic coil bobbin 27, a non-magnetic coil bobbin 27 can prevent magnetic flux from escaping from the coil bobbin 27, thereby 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 bobbin 27 is flush with the inner surface 222 of the bone conduction coil 22 or is concave toward the side away from the bone magnetic circuit assembly 21. For example, the coil frame 27 can be annular, with an inner diameter of the coil frame 27 being 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 frame 27 and the inner surface 222 of the bone conduction coil 22 (i.e., the distance between the coil frame 27 and the inner surface 222 of the bone conduction coil 22) is 0 to 0.15 mm, so that the distance between the bone conduction coil 22 and the magnet 210 can be as close as possible. At the same time, compared with the magnetically conductive coil frame 27, it is less likely to cause friction, thereby fully utilizing 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 working sensitivity of the bone conduction sound generating device 2, and also ensuring the connection strength between the coil frame 27 and the bone conduction coil 22. Figure 45As shown, when the inner diameter of the coil bobbin 27 is larger than that of the bone conduction coil 22, the coil bobbin 27 is recessed into the interior of the bone conduction coil 22, forming a groove between the bone conduction coil 22 and the coil bobbin 27. This allows glue to enter the groove, strengthening the bond between the coil bobbin 27 and the bone conduction coil 22 while preventing glue from protruding from the inner surface of the bone conduction coil 22 and affecting dimensional accuracy. Optionally, the distance D6 between the inner surface 270 of the coil bobbin 27 and the inner surface 222 of the bone conduction coil 22 (i.e., the distance the coil bobbin 27 is recessed into the inner surface 222 of the bone conduction coil 22) is 0.02 to 0.1 mm. This optimal recessed distance of the coil bobbin 27 helps ensure that the coil bobbin 27 does not protrude beyond the bone conduction coil 22 due to assembly errors, thereby reducing or even preventing collision noise caused by the bone magnetic circuit assembly 21 colliding with the coil bobbin 27 during operation, thereby improving the sound quality.

[0280] It is understandable that the coil former 27 does not have to be annular. For example, it may include a plurality of blocks arranged at intervals.

[0281] Next, the air conduction sound generating device 3 of the sound generating unit 10 is described with an example.

[0282] In some embodiments, as Figures 54 to 56 、 Figures 60 to 63 As shown, the air conduction sound-generating device 3 includes an annular air conduction support 30, an air conduction magnetic circuit assembly 31, and a diaphragm assembly 32, both connected to the air conduction support 30. The air conduction support 30 can be made of a lightweight material (e.g., plastic) to reduce the mass and density of the air conduction sound-generating device 3. Optionally, the air conduction support 30 is non-magnetic. The diaphragm assembly 32 includes an air conduction coil 320 located within the magnetic field of the air conduction magnetic circuit assembly 31, and a diaphragm 321 connected between the air conduction coil 320 and the air conduction support 30. When an alternating current is passed through the air conduction coil 320, it will generate an interaction force with the magnetic field of the air conduction magnetic circuit assembly 31, thereby driving the diaphragm 321 to vibrate.

[0283] Next, the air-conduction magnetic circuit component 31 of the air-conduction sound-generating device 3 is first described with an example.

[0284] The air-conducting magnetic circuit assembly 31 at least includes a magnetic support 310 connected to the bottom of the air-conducting bracket 30 , a main magnet 311 arranged on the surface of the magnetic support 310 facing the diaphragm assembly 32 , and a main pole core plate 313 connected to the main magnet 311 .

[0285] The magnetic support member 310 is made of a magnetic material and includes a plate-shaped magnetic bottom plate 3100. Optionally, the thickness of the magnetic bottom plate 3100 is 0.3 to 0.6 mm, so that it has a good magnetic conductivity and is conducive to preventing magnetic leakage. In some embodiments, reference Figure 56 and Figure 61The magnetic support member 310 further includes a magnetic side plate 3101 protruding from the side edge of the magnetic base plate 3100 toward the diaphragm assembly 32. The magnetic side plate 3101 at least partially extends to be disposed opposite the main pole core plate 313, and a gap exists between the magnetic side plate 3101 and the main pole core plate 313, thereby forming an air magnetic gap 315. Optionally, the magnetic base plate 3100 is rectangular, and the magnetic side plates 3101 may be disposed only on two opposing sides of the magnetic base plate 3100, or on all four sides of the magnetic base plate 3100. A magnetic ring 3102 may also be disposed on the magnetic base plate 3100. Figures 57 to 59 This is a top view of the magnetic conductive support member 319 according to some embodiments of the present invention, so as to show the position and number of the magnetic conductive side plates 3101. Figure 57 In the embodiment shown, a magnetic conductive side plate 3101 is provided at each of the two short sides of the magnetic conductive bottom plate 3100. Figure 58 In the embodiment shown, a magnetic conductive side plate 3101 is provided at each of the two long sides of the magnetic conductive bottom plate 3100. Figure 59 In the embodiment shown, each of the four sides of the magnetic conductive bottom plate 3100 is provided with a magnetic conductive side plate 3101. It is understood that, in addition to being relatively independent, each magnetic conductive side plate 3101 can also be connected to form a ring. In some embodiments, such as Figures 60 to 63 As shown, Figure 61 yes Figure 60 The cross-sectional view of the air conduction sound generating device 2 is shown. Figure 62 yes Figure 61 The enlarged view of Part III, Figure 63 yes Figure 60 A three-dimensional diagram of the magnetic support member 310, main magnet 311, and main pole core plate 313 in FIG. The magnetic support member 310 includes a magnetic base plate 3100 and a magnetic ring 3102 extending from the side edge of the base plate 3100 toward the diaphragm assembly 32. The magnetic ring 3102 is formed by connecting four magnetic side plates 3101. The magnetic ring 3102 surrounds the outside of the main pole core plate 313, forming an air-conducting magnetic gap 315, into which the air-conducting coil 320 extends.

[0286] In some embodiments, reference Figure 64 , Figure 64 For the Figure 56In the cross-sectional view taken along the JJ section line, the air-conducting magnetic circuit assembly 31 further includes a secondary magnet 312 connected to the magnetic base plate 3100 to increase the BL value of the air-conducting coil 320. The number of the secondary magnets 312 can be one or more. Optionally, the number of the secondary magnets 312 is an even number, with two opposing secondary magnets 312 located on either side of the main magnet 311. In some embodiments, the air-conducting magnetic circuit assembly 31 further includes a secondary pole core plate 314 connected to the secondary magnet 312. Optionally, each secondary magnet 312 is connected to at least one secondary pole core plate 314 on the surface facing the diaphragm assembly 32 to improve the magnetic conductivity. The secondary pole core plate 314 and the main pole core plate 313 are at least partially arranged relative to each other, and an air-conducting 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. 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-conducting magnetic gap 315 is basically of equal width and the magnetic field distribution in the magnetic gap is more uniform. Figures 65 to 67 It is a top view of the air-conducting magnetic circuit assembly 31 , so as to show the positions and numbers of the secondary pole core plates 314 and the secondary magnets 312 . Figure 65 In the illustrated embodiment, a secondary magnet 312 and a secondary pole core plate 314 are correspondingly provided at each of the two short sides of the magnetic conductive base plate 3100 . Figure 66 In the illustrated embodiment, a secondary magnet 312 and a secondary pole core plate 314 are correspondingly provided at the two long sides of the magnetic conductive base plate 3100 . Figure 67 In the illustrated embodiment, each of the four sides of the magnetic base plate 3100 is provided with a corresponding secondary magnet 312 and a secondary pole core plate 314. Optionally, the two ends of the secondary pole core plate 314 extend beyond the two ends of the secondary magnet 312 in the longitudinal direction to further enhance the magnetic conductivity. The distance L9 by which the secondary pole core plate 314 extends beyond the secondary magnet 312 in the longitudinal direction can be 0.03 to 0.2 mm. Optionally, the two ends of the secondary pole core plate 314 extend beyond the secondary magnet 312 by the same distance.

[0287] The magnetic poles of the main magnet 311 are aligned along the vibration direction B of the air-conducted sound-generating device 3. The magnetic poles of the secondary magnet 312 are also aligned along the vibration direction B, but in the opposite direction to the magnetic pole arrangement of the main magnet 311. It is understood that the vibration direction B of the air-conducted sound-generating device 3 is consistent with the vibration direction of the diaphragm 321. The provision of the secondary magnet 312 can enhance the magnetic field strength and increase the BL value, thereby improving the sensitivity of the air-conducted sound-generating device 3. The secondary pole core plate 314 can guide the magnetic flux lines. It cooperates with the main pole core plate 313 to ensure that the magnetic flux lines of the main magnet 311 and the secondary magnet 312 are more concentrated through the air-conducted coil 320 of the diaphragm assembly 32, thereby improving driving force and sensitivity.

[0288] It is understandable that the outer side of the secondary magnet 312 may or may not be provided with a magnetic conductive side plate 3101. Optionally, when a secondary magnet 312 is provided on one side of the main magnet 311, the magnetic conductive side plate 3101 is no longer provided on that side to reduce mass and volume. Figure 68 As shown, Figure 68 Shown Figure 54 A schematic diagram of the structure of the air-conducting magnetic circuit assembly 31 of the air-conducting sound-generating device 3. Magnetic side plates 3101 are provided on both short sides of the magnetic base plate 3100, but not on the long sides. Secondary magnets 312 are provided on the corresponding long sides of the magnetic base plate 3100. Optionally, the distance between the magnetic side plates 3101 and the main pole core plate 313 is the same as the distance between the secondary pole core plate 314 and the main pole core plate 313, so that the width of the air-conducting gap 315 around the main magnet 311 is consistent, resulting in more balanced vibration.

[0289] In some embodiments, reference Figure 62 、 Figure 64 and Figure 69 The thickness B4 of the main magnet 311 is 0.7 to 1.4 mm, and the thickness B10 of the main pole core plate 313 is 0.2 to 0.4 mm. When the main magnet 311 is too thin, the magnetic field it provides is weak. When the main magnet 311 is too thick, due to space limitations, the thickness of the main pole core plate 313 is insufficient, and the magnetic conductivity is poor. According to the set thickness of the main magnet 311 and the main pole core plate 313, it is beneficial to achieve a balance between the thickness of the main magnet 311 and the main pole core plate 313, thereby providing a higher BL value and avoiding large magnetic leakage, thereby helping to improve the efficiency and sound quality of the speaker. Further optionally, the thickness B4 of the main magnet 311 is 0.9 to 1.2 mm, and the ratio of the thickness of the main magnet 311 to the main pole core plate 313 is 3 to 5.5 to further ensure the effect. The main function of the main pole core plate 313 is to concentrate and guide the magnetic field. An appropriate ratio (3 to 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-conducting magnetic gap 315 where the air-conducting coil 320 is located, thereby increasing the magnetic flux density in the air-conducting magnetic gap 315. A higher magnetic flux density increases the magnetic force exerted on the air-conducting coil 320, thereby enhancing the driving force and enabling the diaphragm 321 to produce larger and more precise vibrations, thereby improving the sensitivity and output power of the air-conducting sound-generating device 3.

[0290] Optionally, in the vibration direction B, the secondary pole core plate 314 and / or the magnetic conductive side plate 3101 and the main pole core plate 313 have a highly overlapping portion. Figure 62 and Figure 69The dotted line in the figure illustrates the location of the highly overlapping portion. The ratio of the thickness of this highly overlapping portion to the thickness B10 of the main pole core plate 313 is 0.4 to 1. This makes the magnetic field within the air-conducting magnetic gap 315 more uniform, and the air-conducting coil 320 and diaphragm 321 vibrate more smoothly, less likely to generate noise, and thus improves distortion. In addition, the magnetic flux lines can more vertically pass through the air-conducting coil 320, which is beneficial to the magnetic field utilization rate of the air-conducting magnetic circuit assembly 31, thereby improving the BL value, enhancing sensitivity, and increasing the loudness of the sound. Furthermore, the ratio of the thickness of the highly overlapping portion to the thickness B10 of the main pole core plate 313 is 0.5 to 0.9. When the folding ring portion 3212 protrudes toward the side where the air-conducting magnetic circuit assembly 31 is located, the secondary pole core plate 314 and / or the magnetic side plate 3101 are lower than the main pole core plate 313, which can provide vibration space for the downwardly protruding folding ring portion 3212.

[0291] In some embodiments, reference Figure 62 The main pole core plate 313 is higher than the magnetically conductive side plates 3101. That is, in the vibration direction B of the air-conducted sound-generating device 3, the surface of the main pole core plate 313 facing the diaphragm 321 is farther from the magnetically conductive base plate 3100 than the surface of the magnetically conductive side plates 3101 facing the diaphragm 321. The end of the main pole core plate 313 near the diaphragm 321 is chamfered 3131. This removal of material reduces the mass of the main pole core plate 313. The side surface 3130 and the chamfer 3131 of the main pole core plate 313 have an intersection O3, which is located on the plane where the end face of the magnetic side plate 3101 facing the diaphragm 321 is located, or located on a position where the plane where the end face of the magnetic side plate 3101 facing the diaphragm 321 is located is biased toward the side where the diaphragm 321 is located (that is, higher than the plane where the end face of the magnetic side plate 3101 facing the diaphragm 321 is located), so as to maximize the highly overlapping area between the magnetic side plate 3101 and the main pole core plate 313, while reducing the mass of the main pole core plate 313, ensuring the magnetic field strength and uniformity in the air magnetic gap 315, thereby ensuring the sound effect. It can be understood that in the embodiment where the air-conducting magnetic circuit assembly 31 includes a secondary pole core plate 314, the main pole core plate 313 can also be provided with a chamfer 3131. Accordingly, the intersection O3 is located on the plane where the end face of the secondary pole core plate 314 facing the diaphragm 321 is located, or is located on a position where the plane where the end face of the secondary pole core plate 314 facing the diaphragm 321 is located is biased toward the side where the diaphragm 321 is located.

[0292] Optionally, the height H7 of the air-conducting coil 320 is greater than the main pole core plate 313, and both ends of the air-conducting coil 320 extend beyond the thickness of the main pole core plate 313. This allows more magnetic flux lines of the air-conducting magnetic circuit assembly 31 to pass through the air-conducting coil 320, thereby improving magnetic field utilization. Optionally, the distance D12 by which the end of the air-conducting coil 320 near the magnetic conductive base plate 3100 extends beyond the main pole core plate 313 is greater than the maximum amplitude of the diaphragm 321 during operation of the air-conducting sound-generating device 3. This ensures that during vibration, the bottom of the air-conducting coil 320 remains below the surface of the main pole core plate 313 facing the magnetic conductive base plate 3100. Further optionally, when the air-conducting magnetic circuit assembly 31 includes a secondary pole core plate 314, the two ends of the air-conducting coil 320 extend to the ends beyond the thickness direction of the secondary pole core plate 314. Further optionally, during the vibration process, the surface of the air-conducting coil 320 facing the magnetic guiding bottom plate 3100 is always no higher than the surface of the secondary pole core plate 314 facing the magnetic guiding bottom plate 3100.

[0293] In some embodiments, the sides of the main magnet 311 and the main pole core plate 313 are flush, and the main magnet 311 and the main pole core plate 313 are rectangular. The four corners of the main magnet 311 are rounded, corresponding to the four corners of the air conduction coil 320. The radius of the rounded corners of the main magnet 311 and the main pole core plate 313 is 0.6 mm to 1.6 mm, and can further be 0.9 mm to 1.3 mm. Within this rounded angle range, the area of ​​the main magnet 311 and the main pole core plate 313 is effectively maintained, thereby providing a larger BL value. It also prevents sharp corners from scratching the air conduction coil 320, improving operational reliability.

[0294] In some embodiments, as Figure 62 and Figure 69 As shown, the side surface 3130 of the main pole core plate 313 protrudes from the side surface 3110 of the main magnet 311. This places the main pole core plate 313 closer to the air conduction coil 320 relative to the main magnet 311, facilitating the convergence of magnetic flux lines through the air conduction coil 320 and improving the BL value. Furthermore, the groove formed between the main pole core plate 313 and the main magnet 311 can accommodate glue. When the main pole core plate 313 and the main magnet 311 are bonded together, the glue can overflow and be contained within the groove, thereby maintaining the outer dimensions of the air conduction magnetic circuit assembly 31 and preventing contact with the air conduction coil 320. Optionally, the distance L4 by which the main pole core plate 313 protrudes from the side surface of the main magnet 311 is 0.03 to 0.1 mm, and the distance L5 between the main pole core plate 313 and the air conduction coil 320 is 0.1 to 0.3 mm. This increases the BL value of the air conduction coil 320 while reducing the risk of the main pole core plate 313 colliding with the air conduction coil 320.

[0295] The main pole core plate 313 and the air conduction coil 320 can be arranged at equal distances, that is, the width of the gap between the two is the same everywhere; or the main pole core plate 313 and the air conduction coil 320 can be arranged at unequal distances, such as Figure 70 As shown, Figure 70 A schematic diagram of the positions of the main pole core plate 313 and the air conduction coil 320 of one embodiment is shown. The main pole core plate 313 is rectangular with rounded corners. The radius R3 of the rounded corners is 0.9 to 2 mm, and can further be 1.2 mm to 1.7 mm. The air conduction coil 320 is in the shape of a rectangular ring. Optionally, the distance L5 between the area of ​​the main pole core plate 313 other than the corners (e.g., the distance between the two long sides and the distance between the two short sides) and the air conduction coil 320 is greater than the distance L5 between the area of ​​the main pole core plate 313 other than the corners and the air conduction coil 320. Optionally, the ratio of the distance D9 to the distance L5 is 1.05 to 1.6 to further reduce the risk of the air conduction magnetic circuit assembly 31 striking the air conduction coil 320. In some embodiments, the distance L5 is 0.1-0.3 mm, and the difference between the distance D9 and the distance L5 is 0.02-0.15 mm, to further ensure collision protection. Because the main pole core plate 313 is closer to the air conduction coil 320, a larger rounded corner R3 helps prevent contact with the air conduction coil 320. Since the main magnet 311 does not protrude from the main pole core plate 313, it can be free of rounded corners, or its rounded corners can be smaller than those of the main pole core plate 313 to increase the BL value.

[0296] In some embodiments, the ratio of the projected area of ​​the main magnet 311 along the vibration direction B on a plane perpendicular to the vibration direction B to the projected area of ​​the air-conducted sound-generating device 3 along the vibration direction B on the same plane is 0.25 to 0.55. This allows the main magnet 311 to have a relatively large cross-sectional area, which helps improve magnetic field utilization and enables the main magnet 311 to provide sufficient magnetic flux density, ensuring efficient operation of the air-conducted coil 320 in the air-conducted magnetic gap 315. This helps improve the sensitivity and efficiency of the air-conducted sound-generating device 3, enabling it to produce a louder volume even at lower power. The projected areas of both the main magnet 311 and the air-conducted sound-generating device 3 refer to the area enclosed by their projected outer contours.

[0297] Optional, Figure 69In the illustrated embodiment, the main pole core plate 313 is taller than the secondary pole core plate 314 and the magnetically conductive side plate 3101. That is, its end surface facing the diaphragm assembly 32 is farther from the magnetically conductive base plate 3100. Because the magnetically conductive side plate 3101 and the secondary pole core plate 314 are located directly below the fold 3212 of the diaphragm 321, the shorter magnetically conductive side plate 3101 and the secondary pole core plate 314 help provide ample vibration space and reduce the thickness of the air-conducted sound-generating device 3 in the vibration direction B. Optionally, the thickness B4 of the main magnet 311 is greater than the thickness B5 of the secondary magnet 312, thereby increasing the height of the main pole core plate 313. Further, optionally, the difference between the thickness B4 of the main magnet 311 and the thickness B5 of the secondary magnet 312 is 0.05 to 0.2 mm.

[0298] Next, the diaphragm assembly 32 of the air conduction sound generating device 3 is described with an example.

[0299] like Figure 62 、 Figure 69 、 Figure 71 and Figure 72 As shown, the diaphragm 321 includes an outer ring 3210 connected to the air guide bracket 30, a flat intermediate sheet 3211 located within the outer ring 3210, and a folded ring portion 3212 located between the outer ring 3210 and the intermediate sheet 3211. The folded ring portion 3212 seals the area between the outer ring 3210 and the intermediate sheet 3211. The cross section of the folded ring portion 3212 is arc-shaped, and it can be concave toward the side where the air guide magnetic circuit assembly 31 is located (refer to FIG. Figure 69 and Figure 72 ), or it may protrude in a direction away from the side where the air-conducting magnetic circuit component 31 is located (refer to Figure 62 and Figure 71 Optionally, the outer ring piece 3210 is connected to the end surface 300 of the air conduction support 30, for example, by gluing (such as gluing or double-sided tape).

[0300] One end of the air-conducting coil 320 is connected to the middle plate 3211 of the diaphragm 321, and the other end extends into the air-conducting magnetic gap 315. It surrounds the exterior of the main pole core plate 313 and is located inside the magnetic side plates 3101. The main pole core plate 313 and magnetic side plates 3101 guide and converge magnetic flux lines, ensuring a more concentrated and uniform flow through the coil, thereby improving sensitivity and driving force. When an alternating current flows through the air-conducting coil 320, it vibrates back and forth in interaction with the magnetic field, driving the diaphragm 321 to vibrate. The diaphragm 321 then pushes air to vibrate, producing sound.

[0301] Optional, such as Figure 62 and Figure 69As shown, the distance L6 between the intermediate plate 3211 and the main pole core plate 313 is 0.4-0.8 mm, and the distance L7 between the air conduction coil 320 and the magnetic base plate 3100 is 0.4-0.8 mm. Both distances L6 and L7 are greater than the maximum amplitude of the diaphragm 321 when the air conduction sound device 3 is in operation. This prevents collisions between the diaphragm 321 and the main pole core plate 313, and between the air conduction coil 320 and the magnetic base plate 3100, thereby reducing sound distortion and noise and extending the service life of the air conduction sound device 3. The maximum amplitude refers to the maximum single-side vibration amplitude of the diaphragm 321 within the frequency range of 20 Hz to 20 kHz when a voltage of 0.5 Vrms is input to the air conduction sound device 3. Optionally, the ratio of distance L6 to distance L7 ranges from 0.8 to 1.2, i.e., distances L6 and L7 are relatively close, thereby reducing the size of the air-conducted sound-generating device 3 in the vibration direction B. Further optionally, the ratio of distance L6 to distance L7 ranges from 0.9 to 1.1. Further optionally, the two distances are equal. Optionally, the maximum amplitude of the air-conducted sound-generating device 3 ranges from 0.2 to 0.7 mm, further optionally from 0.3 to 0.5 mm. If the amplitude is too small, sensitivity is insufficient; if the amplitude is too large, noise is likely to be generated. If the ratio is too small, insufficient margin is likely to generate noise; if it is too large, space is wasted. Further optionally, the difference between distances L6 and L7 and the maximum amplitude of the diaphragm 321 is 0.1 to 0.3 mm.

[0302] In some embodiments, reference Figure 56 and Figure 71 In order to enhance the strength of the intermediate sheet 3211 and improve the sound quality, the diaphragm assembly 32 also includes a reinforcing sheet 3213 attached to the surface of the intermediate sheet 3211. The material of the reinforcing sheet 3213 may be the same as or different from the material of the diaphragm 321. Optionally, the reinforcing sheet 3213 and the intermediate sheet 3211 have the same shape and area to comprehensively reinforce the intermediate sheet 3211. Optionally, the thickness of the reinforcing sheet 3213 is 0.08 to 0.3 mm, and the material of the reinforcing sheet 3213 is a polymer or a metal or a composite of a polymer and a metal; the polymer may be, for example, polyethylene, polypropylene, polyester, polyetherimide, polyethylene terephthalate, a carbon fiber composite material or a pulp fiber composite material; the metal may be, for example, aluminum or titanium. The composite of a polymer and a metal may be, for example, an aluminum layer intermediate carbon fiber composite material. It is understandable that when the reinforcing sheet 3213 is provided, the intermediate sheet 3211 may not be fully enclosed, such as Figure 71 As shown, Figure 71This is an exploded view of the diaphragm 321 and the reinforcement plate 3213 of an embodiment. An opening 32110 is provided in the middle of the middle plate 3211. The reinforcement plate 3213 is connected to the middle plate 3211 to seal the hole, which can reduce the mass of the diaphragm assembly 32.

[0303] Optionally, the area of ​​the reinforcement sheet 3213 ranges from 30 to 65 mm 2 The area ratio of the reinforcing plate 3213 to the diaphragm 321 is in the range of 0.35 to 0.65. A large area ratio of the reinforcing plate 3213 to the diaphragm 321 helps strengthen the rigidity of the diaphragm 321 dome and can extend the high-frequency cutoff frequency. However, if the ratio is too large, the proportion of the fold 3212 will be reduced. If the fold 3212 is too small, the F0 will increase. Setting the area ratio of the reinforcing plate 3213 to the diaphragm 321 to 0.35 to 0.65 can ensure that the high-frequency cutoff frequency is not too far forward, while also helping to keep the F0 within the preset range and not too high.

[0304] In some embodiments, reference Figure 56 and Figure 69 The air-conducting sound-generating device 3 further includes a gland 33, which is annular and connected to the surface of the outer ring 3210 and extends to be arranged opposite to the folding ring portion 3212, thereby protecting the internal folding ring portion 3212. At the same time, the gland 33 is provided with a flat outer end surface 330, and can be connected to the outer shell component 100 through the outer end surface 330, for example, by applying glue or providing double-sided tape 331 on the outer end surface 330, so as to be adhesively connected to the outer shell component 100. Figure 73 The figure shows the situation when the double-sided tape 331 is provided on the outer end surface 330. Optionally, the inner end 334 of the pressure cover 33 (the end close to the middle piece 3211) facing the diaphragm 321 is provided with a recess 332. The recess 332 makes the part closer to the inner end 334 of the pressure cover 33 farther away from the middle piece 3211 in the vibration direction B, thereby reliably avoiding the vibration of the diaphragm 321. Optionally, refer to Figure 54 and Figure 55 The end surface 300 of the air guide bracket 30 is provided with a plurality of outwardly protruding protrusions 301, and the gland 33 is provided with retaining grooves 333 adapted to the protrusions 301. The retaining grooves 333 are engaged with the protrusions 301 to achieve the positioning of the gland 33. Optionally, the protrusions 301 are provided at the four corners of the air guide bracket 30, and the retaining grooves 333 are provided at the four corners of the gland 33.

[0305] It will be appreciated that in embodiments where the air conduction sound generating device 3 does not include a gland 33, the outer ring 3210 can be connected to the housing 1000, with the diaphragm 321 sealing the front cavity 10042. For example, in embodiments where the side housing portion 1004 is not provided with a mounting groove 10041, the outer ring 3210 can be connected to the inner wall of the side housing portion 1004. In embodiments where the side housing portion 1004 is provided with a mounting groove 10041, the outer ring 3210 can be connected to the groove bottom surface 10043. In embodiments where the air conduction sound generating device 3 includes a gland 33, the gland 33 can be connected to the housing 1000, with the air conduction sound generating device 3 sealing the front cavity 10042. For example, in an embodiment where the side shell portion 1004 is not provided with the mounting groove 10041, the pressure cover 33 can be connected to the inner wall of the side shell portion 1004; in an embodiment where the side shell portion 1004 is provided with the mounting groove 10041, the pressure cover 33 can be connected to the bottom surface 10043 of the groove.

[0306] In some embodiments, the effective radiation area Sd of the diaphragm 321 is in the range of 0.5 cm 2 ~1.4cm 2 , further optional 0.75cm 2 ~1.2cm 2 The ratio of the effective radiation area Sd to the area of ​​the entire diaphragm 321 is 0.55 to 0.75. The larger the effective radiation area Sd of the diaphragm 321, the greater the radiated energy and the higher the sensitivity. However, the larger the proportion of the effective radiation area Sd to the diaphragm 321, the smaller the folding ring 3212 will be. A small folding ring 3212 will result in a higher low-frequency F0. The selected effective radiation area Sd and the ratio of the effective radiation area Sd to the diaphragm area can better balance the sensitivity and low-frequency F0, resulting in better sound quality. It should be pointed out that, referring to Figure 74 and Figure 75 The effective radiation area Sd refers to the area enclosed by the center line 3212a of the folding ring portion 3212, and the area of ​​the diaphragm 321 refers to the area enclosed by the outer edge of the diaphragm 321.

[0307] Optionally, the width W6 of the folding ring portion 3212 excluding its corners is 0.6-1.5 mm, and the height H8 of the folding ring portion 3212 is 0.2-0.5 mm. The wider the folding ring portion 3212, the lower the F0 of the air-conducting sound-generating device 3, but when it is wider, it occupies the space of the air-conducting magnetic circuit component 31 and reduces the effective vibration area, so it cannot be too large or too small, and 0.6-1.5 mm is a relatively ideal numerical range after comprehensive consideration; the higher the height of the folding ring portion 3212, the lower the F0, but too high will occupy the thickness space, and 0.2-0.5 mm is a relatively ideal numerical range. Optionally, the aspect ratio of the folding ring portion 3212 (i.e., W2 / H8) is 2-6. Setting the aspect ratio to 2-6 is beneficial to maintaining better linearity when the diaphragm vibrates and reducing nonlinear distortion. In some embodiments, the folding ring portion 3212 is of equal width. In other embodiments, reference Figure 74 and Figure 75 The width W8 of the four corners of the folding ring portion 3212 is greater than the width W6 of other parts. The diaphragm 321 vibrates during operation, especially at high amplitudes. The corners are often areas of stress concentration. Increasing the width of the folding ring portion 3212 at the corners can help disperse these stresses and reduce structural fatigue and damage caused by stress concentration.

[0308] Optionally, the width W7 of the outer ring piece 3210 is 0.45 to 0.9 mm. If the width W7 of the outer ring piece 3210 is too small, the bonding area with the air guide stent 30 will be too small, resulting in weak bonding strength. If the width W7 of the outer ring piece 3210 is too large, it will occupy a large area, resulting in too small an area for the folding portion 3212 and the middle piece 3211, affecting performance. Setting the width W7 of the outer ring piece 3210 to 0.45 to 0.9 mm ensures bonding strength while leaving sufficient space for the folding portion 3212 and the middle piece 3211.

[0309] In some embodiments, reference Figure 75 and Figure 76 The four corners of the rectangular ring portion 3212 are all provided with pleated patterns 3214 to improve the strength of the diaphragm 321. The pleated pattern 3214 includes a plurality of protrusions 32140 protruding away from the air-conducting magnetic circuit component 31 and a recess 32141 recessed toward the air-conducting magnetic circuit component 31. Optionally, the total number of protrusions 32140 at each corner is 3 to 18, and further optionally 5 to 12. The pleated patterns 3214 at the four corners are arranged axially symmetrically or centrally symmetrically, such as Figure 75As shown, the four pleated patterns 3214 are symmetrical about a first symmetry line 321a and a second symmetry line 321b perpendicular to the first symmetry line 321a, thereby ensuring a more balanced vibration of the diaphragm 321. Optionally, the four corners of the fold 3212 are arc-shaped, symmetrical about a third symmetry line 321c. The pleated patterns 3214 are also symmetrical about the third symmetry line 321c, further ensuring the balanced vibration of the diaphragm 321. The width and depth of the pleated pattern 3214 affect the compliance of the diaphragm 321 and the low-frequency F0 of the air conduction sound device. The wider the pattern, the lower the F0, but the strength of the diaphragm 321 is weakened. Setting the width L10 and height H6 of the protrusions 32140 of the pleated pattern 3214 to 0.1-0.3 mm and 0.05-0.15 mm, respectively, can better balance the compliance and strength of the diaphragm 321. Optionally, the depth of the corrugated pattern 3214 is generally half of its width.

[0310] In some embodiments, the diaphragm 321 is made of a non-silicone, low-density material, such as PAR, PEI, PEEK, or PC, or the diaphragm 321 is a composite membrane made of these materials. The total mass of the diaphragm 321 and the reinforcement plate 3213 is 5 to 35 mg, and can further be 8 to 20 mg. The wall thickness of the diaphragm 321 is 0.01 to 0.025 mm, thereby reducing the mass of the diaphragm 321 and making the air conduction sound device 3 as light as possible. In other embodiments, the diaphragm 321 is made of silicone, the wall thickness of the silicone membrane is 0.08 to 0.25 mm, and the total mass of the diaphragm 321 and the reinforcement plate 3213 is 5 to 35 mg. When the diaphragm 321 is made of silicone membrane, the folding ring portion 3212 can optionally be of uniform width and the pleated pattern 3214 described below is not provided.

[0311] In some embodiments, the stiffness coefficient of the diaphragm 321 is 30N / m to 450N / m, and can further be 50N / m to 200N / m. The stiffness coefficient of the diaphragm 321 affects the low-frequency F0 of the air conduction sound-generating device 3. Selecting the aforementioned stiffness coefficient range is conducive to obtaining a more suitable F0 range (50Hz to 280Hz). For example, if the stiffness coefficient of the diaphragm 321 is set to 30N / m to 450N / m and the mass of the diaphragm assembly 32 is 0.03 to 0.15g, the F0 of the air conduction sound-generating device 3 can be between 50 and 280Hz. It is understood that the stiffness coefficient can be adjusted by controlling parameters such as the material and thickness of the diaphragm 321, the size of the folding ring 3212, and the number and size of the protrusions 32140 of the pleated pattern 3214.

[0312] Optionally, the total stiffness coefficient of the shrapnel 23 of the bone conduction sound-generating device 2 (i.e., the sum of the stiffness coefficients of all shrapnel 23) is greater than the stiffness coefficient of the diaphragm 321. Optionally, the ratio of the total stiffness coefficient of the two shrapnel 23 to the stiffness coefficient of the diaphragm 321 is in the range of 10 to 130, and can further be in the range of 15 to 90.

[0313] By adjusting the stiffness coefficients of the shrapnel 23 and the diaphragm 321 and the masses of the vibrating parts of the bone conduction sound emitting device 2 and the air conduction sound emitting device 3 , the low frequency F0 of the bone conduction sound emitting device 2 and the air conduction sound emitting device 3 can be made closer.

[0314] For example, setting the total stiffness coefficient of all shrapnel 23 of the bone conduction sound-generating device 2 to 2000 N / m to 6000 N / m and setting the mass of the oscillator of the bone conduction sound-generating device 2 to 2 to 2.8 g facilitates maintaining the low-frequency F0 of the bone conduction sound-generating device 2 between 100 and 300 Hz. Setting the stiffness coefficient of the diaphragm 321 to 30 N / m to 450 N / m and setting the mass of the diaphragm assembly 32 to 0.03 to 0.15 g facilitates maintaining the low-frequency F0 of the air conduction sound-generating device 3 between 50 and 280 Hz and facilitates adjusting the ratio of the low-frequency F0 of the bone conduction sound-generating device 2 to the low-frequency F0 of the air conduction sound-generating device 3 to 1 to 4.

[0315] For another example, the total stiffness coefficient of all the shrapnel 23 of the bone conduction sound-generating device 2 is set to 3000 N / m to 5000 N / m, the mass of the vibrator of the bone conduction sound-generating device 2 is set to 2.3 to 2.6 g, the stiffness coefficient of the diaphragm 321 is set to 50 N / m to 200 N / m, and the mass of the diaphragm assembly 32 is set to 0.05 to 0.13 g, which is conducive to making the ratio of the low-frequency F0 of the bone conduction sound-generating device 2 and the low-frequency F0 of the air conduction sound-generating device 3 be between 1.1 and 2.5.

[0316] For another example, setting the ratio of the total stiffness coefficient of the two springs 23 to the stiffness coefficient of the diaphragm 321 to a range of 10 to 130, and simultaneously setting the ratio of the mass of the vibrator of the bone conduction sound device 2 to the mass of the diaphragm assembly 32 of the air conduction sound device 3 to a range of 10 to 80, is conducive to ensuring that the ratio of the low-frequency resonance point of the bone conduction sound device 2 to the low-frequency resonance point of the air conduction sound device 3 is between 1 and 4. For another example, setting the ratio of the total stiffness coefficient of the two springs 23 to the stiffness coefficient of the diaphragm 321 to a range of 15 to 90, and simultaneously setting the ratio of the mass of the vibrator of the bone conduction sound device 2 to the mass of the diaphragm assembly 32 of the air conduction sound device 3 to a range of 15 to 60, is conducive to ensuring that the ratio of the low-frequency resonance point of the bone conduction sound device 2 to the low-frequency resonance point of the air conduction sound device 3 is between 1.1 and 2.5.

[0317] Next, the air conduction coil 320 of the diaphragm assembly 32 is described with an example.

[0318] In some embodiments, as Figure 62 and Figure 69 As shown, the height H7 of the air conduction coil 320 is 0.9 to 1.8 mm, and the wall thickness B6 of the air conduction coil 320 is 0.08 to 0.3 mm. Optionally, the ratio of the height H7 of the air conduction coil 320 to the wall thickness B6 of the air conduction coil 320 is in the range of 5 to 15. Keeping the wall thickness B6 of the air conduction coil 320 as small as possible can make the magnetic field passing through the air conduction coil 320 more uniform. Making the height H7 of the air conduction coil 320 relatively high can more fully utilize the magnetic field generated by the air conduction magnetic circuit assembly 31, thereby improving sensitivity.

[0319] In some embodiments, the resistance of the air conduction coil 320 can be, for example, 5 to 34 ohms. This will not overload audio equipment such as amplifiers or consume excessive power, thereby ensuring the stability and longevity of the audio system. The number of turns of the air conduction coil 320 ranges from 30 to 120. Too few turns of the air conduction coil 320 will not improve the BL value, while too many turns will occupy too much space and increase the size of the air conduction sound-generating device 3. Therefore, upper and lower limits are necessary; a range of 30 to 120 turns can achieve a balance between BL value and volume.

[0320] Optionally, the radial winding layers of the air conduction coil 320 do not exceed 6 layers, so that the ratio of its height H7 to the wall thickness B6 is between 5 and 15. Optionally, the radial winding layers of the air conduction coil 320 are 2 to 6 layers to ensure its length so that it has a better BL value. Optionally, the radial winding layers of the air conduction coil 320 are an even number of layers, for example, 4 layers or 6 layers, so that the two leads of the air conduction coil 320 are located at the same end of the air conduction coil 320 along the vibration direction B, which is convenient for wiring. The winding method of the air conduction coil 320 can refer to the bone conduction coil 22, reference Figure 52 , Figure 52 The figure shows an embodiment with four winding layers. The dotted lines with arrows indicate the order in which each turn is formed during winding. During winding, the innermost layer is first wound along the coil axis from bottom to top (or top to bottom), followed by the adjacent layer from top to bottom (or bottom to top), and multiple layers are wound in sequence. When the number of layers is even, the two leads of the air-conducting coil 320 can be adjacent to each other, facilitating wire exit from the wire outlet 201. Similarly, the number of turns of the innermost layer of the air-conducting coil 320 is greater than or equal to the number of turns of the outermost layer. For example, the number of turns of each outermost layer is one less than the number of turns of its adjacent innermost layer. This way, each outer turn of the air-conducting coil 320 is located between two innermost turns of the air-conducting coil 320, making the winding more stable. Optionally, the number of turns of each layer of the air-conducting coil 320 gradually decreases toward the outer side. It is understandable that parameters such as resistance, length, wall thickness, and volume of the air conduction coil 320 can be adjusted by the number of turns of the air conduction coil 320 .

[0321] Optionally, the wire diameter of the bone conduction coil 22 is larger than that of the air conduction coil 320 to reduce the mass of the diaphragm assembly 32. Furthermore, the thicker wire diameter of the bone conduction coil 22 facilitates input of a larger current and provides a larger magnetic field, thereby increasing the driving force that drives the bone magnetic circuit assembly 21 to vibrate. Optionally, the wire diameter of the bone conduction coil 22 is greater than or equal to 0.1 mm, and the wire diameter of the air conduction coil 320 is less than or equal to 0.06 mm.

[0322] Next, the routing of the lead wires of the air conduction coil 320 is described with an example.

[0323] In some embodiments, reference Figures 77 to 79 The air conduction support 30 includes a rectangular ring-shaped outer frame 302, a first limiting boss 303 provided at a corner of the outer frame 302, and a second limiting boss 304 provided at a short side 302a of the outer frame 302. Both the first limiting boss 303 and the second limiting boss 304 protrude into the inner side of the outer frame 302. A space is formed between the two first limiting bosses 303 located at the long side 302b to accommodate the secondary magnet 312 and the secondary pole core plate 314. Optionally, a clearance fit is provided between the secondary pole core plate 314 and the two first limiting bosses 303, enabling the two first limiting bosses 303 to limit the longitudinal freedom of the secondary pole core plate 314. The two second limiting bosses 304 are respectively provided at opposite ends of the magnetic support member 310 to limit the longitudinal freedom of the magnetic support member 310. The magnetic side plate 3101 extends to exceed the upper surface 3040 of the second limiting boss 304 (i.e., the surface facing the diaphragm 321), forming a spacing groove 3020 between the magnetic side plate 3101 and the outer frame 302. The outer frame 302 is also provided with a wiring groove 3021 for the lead wire 3200 of the air supply coil 320 to pass through. The lead wire 3200 of the air supply coil 320 passes around the end of the magnetic side plate 3101 away from the wiring groove 3021 and then passes through the spacing groove 3020 on the outside of the magnetic side plate 3101, and then passes through the wiring groove 3021, which is more convenient for wiring.

[0324] Optionally, one of the two first limiting bosses 303 located on the short side 302a is provided with an avoidance groove 3030, and the other is provided with a support plane 3031. The upper surface 3040 of the second limiting boss 304 rises from the avoidance groove 3030 toward the support plane 3031, with the end closer to the avoidance groove 3030 being farther from the diaphragm 321 than the end closer to the support plane 3031, i.e., the height gradually increases. The upper surface 3040 may be, for example, an inclined or curved surface (illustrated as an inclined surface). The lead wire 3200 of the air conduction coil 320 reverses from the avoidance groove 3030 and wraps around to the outside of the magnetic conductive side plate 3101, then extends from the upper surface 3040 within the spacing groove 3202 to the support plane 3031. The wiring groove 3021 is arranged corresponding to the support plane 3031, allowing the lead wire 3200 to easily pass through the wiring groove 3021. In this way, a vibration space can be formed between the lead wire 3200 of the air conduction coil 320 and the upper surface 3040, preventing the lead wire 3200 from being frequently bent and damaged when the air conduction coil 320 vibrates, thereby improving the reliability of the air conduction sound-generating device 3 and reducing noise.

[0325] Optionally, the lead wire 3200 is located at the bottom of the air conduction coil 320. When the air conduction coil 320 is in place, the lead wire 3200 may or may not be in contact with the support plane 3031.

[0326] Optionally, the two wiring grooves 3021 are set at an angle, and the ends of the two wiring grooves 3021 close to the outside of the outer frame 302 are close to each other to guide the air conduction coil 320 to change the angle toward the middle, making the wiring more natural and preventing the lead 3200 from being damaged due to excessive corners.

[0327] It is understood that in the embodiment where the magnetic conductive side plates 3101 are located on the long sides of the magnetic conductive bottom plate 3100, the second limiting boss 304 can also be located on the long sides 302b of the outer frame 302, with other components and structures adjusted accordingly. The above-described routing method for the air-conducting coil 320 is also applicable when multiple magnetic conductive side plates 3101 are ring-shaped (i.e., magnetic conductive rings 3102).

[0328] Next, an example is given to illustrate the prevention of magnetic leakage interference between the bone conduction sound generating device 2 and the air conduction sound generating device 3.

[0329] In some embodiments, the maximum magnetic flux leakage at the outer peripheral surface 2a of the bone conduction sound generating device 2 is smaller than the magnetic flux leakage at the end surfaces 2b at both ends thereof along the vibration direction A, which is beneficial for reducing interference with the air conduction sound generating device 3. In addition, the electronic components corresponding to the outer peripheral surface 2a of the bone conduction sound generating device 2 can be arranged relatively close to the bone conduction support 20 and may have an overlapping area in the vibration direction A (for example, arranged opposite to the outer peripheral surface of the bone conduction support 20). The bone conduction sound generating device 2 has a certain vibration space reserved for the electronic components in the vibration direction A, and the distance is relatively large, which has a relatively small impact on the electronic components. By setting the magnetic flux leakage at the end surface 2b of the bone conduction sound generating device 2 to be greater than the magnetic flux leakage at its outer peripheral surface 2a, the difficulty of preventing magnetic flux leakage can be reduced while reducing the impact of the magnetic flux leakage on external components.

[0330] Furthermore, the maximum magnetic flux leakage at the bottom surface 3b of the air conduction sound device 3 is smaller than the maximum magnetic flux leakage at the outer peripheral surface 2a of the bone conduction sound device 2, which also makes the interference to the bone conduction sound device 2 relatively small. In addition, it can be understood that, Figure 10a In the illustrated embodiment, the magnetically conductive base plate 3100 of the air conduction sound-generating device 3 faces the interior of the housing assembly 100. This magnetic shielding effect of the magnetically conductive base plate 3100 and the bone conduction support 20 can reduce magnetic fields leaking into the housing assembly 100, minimizing the impact of magnetic leakage on other electronic components. The magnetically conductive base plate 3100 of the air conduction sound-generating device 3 is positioned opposite the bone conduction support 20 of the bone conduction sound-generating device 2. When the bone conduction support 20 is also magnetically conductive, this provides a certain degree of magnetic shielding, effectively reducing mutual interference from magnetic leakage. It is understood that when subjected to significant magnetic leakage interference, a uniform magnetic field may become uneven, affecting the vibration balance of the vibrating components. Furthermore, opposing magnetic fields may offset some of the magnetic fields, resulting in a reduction in BL. Therefore, reducing mutual interference from magnetic leakage helps ensure stable vibration of the vibrating components of the bone conduction sound-generating device 2 and the air conduction sound-generating device 3, ensuring operational reliability and sound quality.

[0331] The magnetically conductive side plates 3101 of the air-conducting sound-generating device 3 can reduce magnetic field leakage from the sides of the air-conducting sound-generating device 3. Generally, the greater the number of magnetically conductive side plates 3101, the less magnetic field leakage. Optionally, multiple magnetically conductive side plates 3101 can be connected in a ring shape (i.e., a magnetic conductive ring 3102) to further reduce lateral magnetic flux leakage from the air-conducting sound-generating device 3. Furthermore, the magnetically conductive side plates 3101 can be at least partially located within the mounting slots 10041. In this way, lateral magnetic flux leakage from the air-conducting sound-generating device 3 can have a lesser impact on components within the housing assembly 100.

[0332] In some embodiments, the maximum magnetic flux leakage range at the outer circumference 2a of the bone conduction sound-generating device 2 (i.e., the outer circumference of the bone conduction support 20) is 10mT to 200mT. At the end surface 2b of the bone conduction sound-generating device 2 in the vibration direction A (i.e., the plane where the outer end surface of the outer frame 230 of the spring 23 is located), the maximum magnetic flux leakage range is 20mT to 300mT, thereby reducing the impact on electronic components outside the bone conduction sound-generating device 2. The magnitude of the magnetic flux leakage can be adjusted by controlling the thickness and material of the bone conduction support 20, magnetic conductive plate 211, and / or magnet 210. For example, the thicker the bone conduction support 20, the smaller the lateral magnetic flux leakage. The thicker the magnetic conductive plate 211 and the thinner the magnet 210, the smaller the magnetic flux leakage at the end surface.

[0333] It is understandable that the change in thickness will also change the mass of each part of the bone conduction sound-generating device 2 and the magnetic properties of the magnetic circuit, thereby affecting the sound effect of the bone conduction sound-generating device 2 (for example, affecting its low-frequency F0 and sensitivity and other parameters). Further, optionally, the maximum leakage magnetic flux range at the outer peripheral surface 2a of the bone conduction sound-generating device 2 is 30mT to 150mT, and the maximum leakage magnetic flux range at the end surface 2b of the bone conduction sound-generating device 2 in the vibration direction A is 40mT to 250mT, so that the bone conduction bracket 20, the magnetic conductive plate 211 and the magnet 210 of the bone conduction sound-generating device 2 can be within a suitable size range, while reducing the leakage magnetic flux, ensuring the sound effect of the bone conduction sound-generating device 2, and helping to keep its mass and volume within a suitable range.

[0334] The magnitude of magnetic flux leakage can be measured using a Tesla meter (or Gauss meter). Specifically, the probe is moved along the outer surface 2a of the bone conduction stent 20, circling the outer surface 2a. The maximum value is taken as the maximum magnetic flux leakage value at the outer surface 2a. Similarly, the probe is moved within the plane of the end surface 2b, urging the probe to move in close contact with the end surface 2b. The maximum value is taken as the maximum magnetic flux leakage value at the end surface 2b.

[0335] In some embodiments, the maximum magnetic flux leakage range at the outer surface 3a of the air conduction sounding device 3 (i.e., the outer surface of the air conduction support 30) is 10mT to 120mT, and the maximum magnetic flux leakage range at the bottom surface 3b of the air conduction sounding device 3 is 20mT to 150mT. The bottom surface 3b of the air conduction sounding device 3 refers to the relatively more outwardly protruding surface of the air conduction support 30 and the magnetic support member 310. Optionally, the bottoms of the air conduction support 30 and the magnetic support member 310 are flush, with the bottom surface 3b facing the bone conduction sounding device 2 and adjacent to the outer surface 2a of the bone conduction sounding device 2. When the magnetic flux leakage of the air conduction sounding device 3 is large, it has a strong attraction effect on surrounding ferromagnetic objects. If it is installed in the sounding unit 10, it will have an adverse effect on the internal electronic components. The size of the leakage magnetic flux can be adjusted by controlling the thickness of the air conduction bracket 30, the main magnet 311, the main pole core plate 313, the secondary magnet 312, the secondary pole core plate 314 and / or the magnetic support 310. The size of the leakage magnetic flux can also be adjusted by controlling the number and position of the secondary magnet 312, the secondary pole core plate 314 and / or the magnetic side plate 3101. Similarly, changes in thickness, quantity and position will affect the sound effect of the air-conducting sound-generating device 3. Further optionally, the maximum leakage magnetic field range at the outer peripheral surface 3a of the air-conducting sound-generating device 3 is 20 to 80 mT, and the maximum leakage magnetic field range at the bottom surface 3b of the air-conducting sound-generating device 3 is 30 mT to 100 mT, so that the various components of the air-conducting sound-generating device 3 are within a suitable size range, and the number and position of the secondary magnet 312, the secondary pole core plate 314 and the magnetic conductive side plate 3101 are more reasonable, while reducing the leakage magnetic field, ensuring the sound effect of the air-conducting sound-generating device 3, and helping to make its mass and volume within a suitable range.

[0336] In some embodiments, the maximum magnetic flux leakage at the top surface 3d of the air conduction sound device 3 is smaller than the maximum magnetic flux leakage at the outer peripheral surface 2a of the bone conduction sound device 2. Figure 10b When the top surface 3d of the air conduction sound emitting device 3 is installed toward the bone conduction sound emitting device 2, its diaphragm assembly 32 is arranged opposite to the bone conduction support 20. At this time, the maximum leakage magnetic field at the top surface 3d of the air conduction sound emitting device 3 is set to be smaller than the maximum leakage magnetic field at the outer peripheral surface 2a of the bone conduction sound emitting device 2, which can reduce the interference of its leakage magnetic field on the bone conduction sound emitting device 2. The top surface 3d of the air conduction sound emitting device 3 refers to the outer surface of the component within the folding ring portion 3212 of the diaphragm 321. For example, when the air conduction sound emitting device 3 does not include the reinforcement plate 3213, the outer surface of the middle plate body 3211 of the diaphragm 321 is the top surface 3d. When the air conduction sound emitting device 3 includes the reinforcement plate 3213, the outer surface of the reinforcement plate 3213 is the top surface 3d.

[0337] Optionally, the maximum magnetic flux leakage range at the outer peripheral surface 3a of the air-conducted sound-generating device 3 is 10mT to 120mT, and the maximum magnetic flux leakage range at the top surface 3d of the air-conducted sound-generating device 3 is 20 to 150mT. The magnetic flux leakage at the top surface 3d can be adjusted by controlling the thickness of the main magnet 311, the main pole core plate 313, the secondary magnet 312, and / or the secondary pole core plate 314, or by adjusting the distance between the main pole core plate 313, the secondary pole core plate 314, and / or the magnetic conductive side plate 3101 and the diaphragm 321. Generally, the greater the distance, the smaller the magnetic flux leakage. Further optionally, the maximum magnetic leakage range at the outer peripheral surface 3a of the air-conducting sound-generating device 3 is 20 to 80 mT, and the maximum magnetic leakage range at the bottom surface 3b of the air-conducting sound-generating device 3 is 30 mT to 100 mT, so that each component has a suitable size, and the distance between the main pole core plate 313, the secondary pole core plate 314 and the magnetic conductive side plate 3101 and the diaphragm 321 is more suitable, so that the size of the air-conducting sound-generating device 3 is more suitable, while reducing the magnetic leakage, the sound effect of the air-conducting sound-generating device 3 is guaranteed.

[0338] In some embodiments, the maximum magnetic flux leakage at the top surface 3d and bottom surface 3b of the air conduction sound-generating device 3 is less than the maximum magnetic flux leakage at the outer peripheral surface 2a of the bone conduction sound-generating device 2, so that the magnetic flux leakage interference between the two sound-generating devices is relatively small, regardless of whether the air conduction sound-generating device 3 is installed facing or facing away from the bone conduction sound-generating device 2. Optionally, the maximum magnetic flux leakage range at the outer peripheral surface 3a of the air conduction sound-generating device 3 is 10mT to 120mT, and the maximum magnetic flux leakage range at the top surface 3d and bottom surface 3b of the air conduction sound-generating device 3 is 20 to 150mT. Further, optionally, the maximum magnetic flux leakage range at the outer peripheral surface 3a of the air conduction sound-generating device 3 is 20 to 80mT, and the maximum magnetic flux leakage range at the top surface 3d and bottom surface 3b of the air conduction sound-generating device 3 is 30mT to 100mT.

[0339] The magnitude of magnetic flux leakage can be measured using a Tesla meter (or Gauss meter). Specifically, the probe is moved along the outer peripheral surface 3a of the air conduction support 30 while in close contact with the outer peripheral surface 3a, circling the outer peripheral surface 3a. The maximum magnetic flux leakage value at the outer peripheral surface 3a is taken as the maximum magnetic flux leakage value. Similarly, the probe is moved within the plane of the bottom surface 3b while in close contact with the bottom surface 3b. The maximum magnetic flux leakage value at the bottom surface 3b is taken as the maximum magnetic flux leakage value. The probe is moved within the plane of the top surface 3d while in close contact with the top surface 3d. The maximum magnetic flux leakage value at the top surface 3d is taken as the maximum magnetic flux leakage value.

[0340] In some embodiments, the bone conduction sound device 2 and the air conduction sound device 3 are not in contact, but are spaced apart. Optionally, the distance L8 between the bone conduction sound device 2 and the air conduction sound device 3 is greater than or equal to 0.3 mm, which can reduce the mutual interference of vibration between the bone conduction sound device 2 and the air conduction sound device 3 and reduce the mutual influence of leakage magnetic field between the two. Figure 10aIn the embodiment shown, the distance L8 is the distance between the magnetic base plate 3100 and the bone conduction support 20. Figure 10b In the illustrated embodiment, the distance L8 is the distance between the folding ring portion 3212 and the bone conduction support 20. It can be understood that when the folding ring portion 3212 is concave, the distance L8 is the distance between the top surface 3d and the bone conduction support 20. Further, the distance L8 can be 0.3 to 6 mm to improve the space utilization of the sound unit and enable the device to achieve a more miniaturized design. The larger the distance L8, the larger the air conduction back cavity can be, but it will obviously cause the volume and weight of the sound unit 10 to increase simultaneously, thereby increasing the weight of the entire headset, increasing the sense of weight when wearing it, and affecting the user experience. At the same time, because of the increase in weight, the vibration mass will increase simultaneously, and the sensitivity at high frequencies will decrease. The sound heard by people is not full and delicate enough, affecting the final listening quality. Further optionally, the distance L8 is 0.5 to 2 mm to further reduce the volume, reduce the mass, and improve the listening effect. Optionally, Figure 10a In the embodiment shown, the surface of the air conduction sound emitting device 3 facing the bone conduction sound emitting device 2 (i.e., the bottom surface 3b) is parallel to the surface of the bone conduction sound emitting device 2 facing the air conduction sound emitting device 3. Figure 10b In the illustrated embodiment, the surface of the air conduction sound emitting device 3 facing the bone conduction sound emitting device 2 (ie, the top surface 3d) is parallel to the surface of the bone conduction sound emitting device 2 facing the air conduction sound emitting device 3, so as to fully utilize the space.

[0341] The magnetic bottom plate 3100 and / or the magnetic side plate 3101 of the magnetic support 310 are provided with at least one opening so that the interior of the air guide sound generating device 3 can communicate with the interior of the housing assembly 100, so that the air flow can flow smoothly. Optionally, the total area of ​​all the vent holes 3c of the magnetic support 310 is 2 to 15 mm. 2 , so as to ensure the air flow while reducing the adverse effect of the vent hole 3c on the anti-magnetic leakage. Further optional, the total area of ​​all the openings is 4 to 12 mm 2 , to further ensure the effect.

[0342] Next, an example is given to illustrate the connection between the bone conduction sound generating device 2 and the air conduction sound generating device 3 and the control circuit board.

[0343] The leads of the coils of the bone conduction sound generator 2 and the air conduction sound generator 3 need to be electrically connected to the control circuit board 1124 in the control compartment 112 so that they can operate under the control of the control circuit board 1124. The control circuit board 1124 in the control compartment 112 is connected to a cable 1125, which enters the sound unit 10 through the ear hook 111 to enable electrical connection with the bone conduction sound generator 2 and the air conduction sound generator 3.

[0344] In some embodiments, the cable 1125 is connected to the external circuit board 25 and the coil lead of the air conduction sound generating device 3.

[0345] In some embodiments, the sound unit 10 further includes a switching circuit board 13, and the bone conduction sound device 2 is electrically connected to the control circuit board 1124 via the switching circuit board 13. Optionally, as shown in FIG. Figure 80 As shown, the cable 1125 is first connected to the adapter circuit board 13, and then the adapter circuit board 13 and the external circuit board 25 are connected through the wire 1126 to realize the electrical connection between the bone conduction sound device 2 and the control circuit board 1124, and the coil lead 3200 of the air conduction sound device 3 is directly connected to the adapter circuit board 13 (including the case where the lead 3200 and the adapter circuit board 13 are connected through other wires) to realize the electrical connection between the air conduction sound device 3 and the adapter circuit board 13.

[0346] In other embodiments, the bone conduction sound generating device 2 is directly connected to the control circuit board 1124 via a cable 1125. Optionally, as shown in FIG. Figure 81 As shown, Figure 80 and Figure 81 The difference of the illustrated embodiment is that the cable 1125 is partially connected to the adapter circuit board 13 and partially directly connected to the external circuit board 25 to achieve electrical connection between the control circuit board 1124 and the bone conduction sound device 2.

[0347] The position of the transfer circuit board 13 can be varied. Figure 8 and Figure 82 In the embodiment shown, the adapter circuit board 13 is attached to the inner wall of the housing 1000 and is arranged opposite to the external circuit board 25, thereby facilitating wiring. In this case, the adapter circuit board 13 is arranged adjacent to the external circuit board 25 and the air conduction sound generating device 3, making wiring more convenient. Figure 83 In the illustrated embodiment, the adapter circuit board 13 is disposed at the bottom of the housing 1000 and is connected to the inner bottom wall of the housing 1000 (for example, it can be directly attached to the inner bottom wall of the housing 1000, or connected to the positioning support column 120 on the inner bottom wall), and is located below the bone conduction sound device 2. At this time, it is convenient to open a wiring hole at the position corresponding to the external circuit board 25 in the housing 1000 to allow the cable to pass through the housing 1000.

[0348] The following is an example description of the volume, mass and density of the bone conduction sound generating device 2 and the air conduction sound generating device 3.

[0349] In some embodiments, the volume of the sound unit 10 (referring to a single sound unit 10) ranges from 2500 to 5500 mm3, ensuring that the earphone head is neither too large nor too small, thereby improving wearing comfort and providing ample space for the internal sound device and other components. The volume of the sound unit 10 is the volume of the sound unit 10 without the ear hook 111, for example, the volume of the sound unit 10 obtained by cutting off the connection 111a between the ear hook 111 and the sound unit 10.

[0350] The volume of an object (such as the bone conduction sound-generating device 2, the air conduction sound-generating device 3, and the sound-generating unit 10, etc.) is calculated by the size of the space it occupies. The cavity or hollow part of the object is also included in its volume. For regular objects, such as rectangular parallelepiped, cylinder, or rectangular parallelepiped, cylindrical, etc., the volume can be calculated by multiplying the bottom area by the height. The volume of the sound-generating device (bone conduction sound-generating device 2 and 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 its thickness direction. 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 maximum outer contour of the sound-generating device in the thickness direction. For example, Figure 17 The maximum cross-sectional area of ​​the bone conduction sound generating device 2 shown can be approximately equal to the area enclosed by the outer contour of its bone conduction support 20. Figure 54 and Figure 61 The maximum cross-sectional area of ​​the air conduction sound generating device 3 shown can be approximately equal to the area enclosed by the outer contour of the end face 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.

[0351] The larger the size of the bone conduction sound-generating device 2, the larger the size of its bone conduction bracket 20, internal bone conduction magnetic circuit assembly 21, and bone conduction coil 22, thereby enabling the bone conduction sound-generating device 2 to provide greater loudness. However, a larger size compresses the installation space for the air conduction sound-generating device 3 and other components, affecting the sound quality of the air conduction sound-generating device 3. Similarly, a smaller air conduction sound-generating device 3 can save space within the device, allowing more space for other headphone components (bone conduction sound-generating device, circuit board, etc.), thereby improving the functionality and performance of the device.

[0352] In some embodiments, the volume of the bone conduction sound emitting device 2 is set to 600-1000 mm3, and the volume of the air conduction sound emitting device 3 is set to 180-500 mm3, so that the volume is more appropriate and balanced with the volume of the air conduction sound emitting device 3. Further optionally, the volume of the bone conduction sound emitting device 2 can be set to 700-900 mm3, and the volume of the air conduction sound emitting device 3 can be set to 220-360 mm3, so as to further make the space occupied by the bone conduction sound emitting device 2 and the air conduction sound emitting device 3 more reasonable.

[0353] In some embodiments, the volume ratio of the air conduction sound-emitting device 3 and the sound-emitting unit 10 is 0.03 to 0.18. The size of the volume ratio reflects the volume utilization rate. Generally, the larger the ratio, the larger the air conduction magnetic circuit component 31 of the air conduction sound-emitting device 3 can be made, and the effective radiation area of ​​the diaphragm can also be made larger, and the corresponding acoustic effect is better. For example, the sensitivity of the air conduction sound-emitting device 3 will be improved. However, if the air conduction sound-emitting device 3 is too large, it will be inconvenient to install other parts, and it will occupy the space of the bone conduction sound-emitting device 2, affecting the sound effect of the bone conduction sound-emitting device 2. If the volume ratio is too small, the internal space will be wasted, which is not conducive to miniaturizing and reducing the weight of the earphones. The volume ratio of the bone conduction sound device 2 to the sound unit 10 is 0.12 to 0.32. Similarly, the larger the ratio, the better the acoustic effect, such as the sensitivity of the bone conduction sound device 2. However, if the bone conduction sound device 2 is too large, it will be inconvenient to install other parts, and it will occupy the space of the air conduction sound device 3, affecting the sound effect of the air conduction sound device 3. If the volume ratio is too small, the internal space will be wasted, which is not conducive to miniaturization and weight reduction of the earphone.

[0354] Further optionally, the volume ratio of the air conduction sounding device 3 and the sounding unit 10 is 0.06-0.12, and the volume ratio of the bone conduction sounding device 2 and the sounding unit 10 is 0.18-0.28, so as to further make the space ratio occupied by the bone conduction sounding device 2 and the air conduction sounding device 3 more reasonable.

[0355] In some embodiments, 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 that of the air conduction sound-generating device 3. Optionally, the volume ratio of the bone conduction sound-generating device 2 to the air conduction sound-generating device 3 is 1.5 to 4.5. The larger volume of the bone conduction sound-generating device 2 facilitates greater vibration, while the air conduction sound-generating device 3, which relies on the diaphragm to generate sound, can achieve an air conduction sound transmission effect with a smaller volume. This balances the volume of the air and bone conduction sounds, improving the overall sound quality of the sound-generating unit. The volume ratio of the bone conduction sound-generating device 2 to the air conduction sound-generating device 3 can further be selected to be 1.7 to 4.2, and even more preferably 2 to 3.6, to further enhance the sound quality and facilitate installation within the housing assembly 100.

[0356] In some embodiments, the mass of the bone conduction sound device 2 is 3-5g. The mass of the bone conduction sound device 2 affects the mass of the earphone head, which in turn affects the user experience. When the headphone head is too heavy, the user will notice a noticeable wearing irritation. Setting the mass of the bone conduction sound device 2 to no more than 5g helps ensure wearing comfort. To achieve better acoustic performance, the bone conduction magnetic circuit assembly 21 of the bone conduction sound device 2 needs to have an appropriate mass to adjust F0 and provide a greater vibration force, so it is set to greater than 3g. In some embodiments, the mass of the air conduction sound device 3 is 0.6-1.6g. Similarly, a lighter mass can improve wearing comfort, especially for prolonged wear.

[0357] To improve the sound quality of the sound-generating unit, in some embodiments, the mass of the bone conduction sound-generating device 2 is greater than the mass of the air conduction sound-generating device 3. Optionally, the ratio of the mass of the bone conduction sound-generating device 2 to the mass of the air conduction sound-generating device 3 is 2 to 6. The bone conduction sound-generating device 2 needs to drive the heavier vibrator to vibrate, while the air conduction sound-generating device 3 relies on the lighter diaphragm assembly 32 to vibrate and produce sound. Therefore, the larger mass of the bone conduction sound-generating device 2 facilitates the use of larger coils and magnets, thereby providing a greater vibration amplitude. On the other hand, the air conduction sound-generating device 3 relies on the diaphragm to produce sound, which can achieve better air conduction sound transmission with a smaller mass, thereby improving the overall sound quality of the sound-generating unit 10.

[0358] Further optionally, the mass of the bone conduction sound emitting device 2 can be selected to be 3.3-4.3 g, and the mass of the air conduction sound emitting device 3 can be selected to be 0.8 g-1.4 g, so that the masses of the bone conduction sound emitting device 2 and the air conduction sound emitting device 3 are more reasonable.

[0359] Further optionally, the ratio of the mass of the bone conduction sound device 2 to the mass of the air conduction sound device 3 can be further selected to be 2.5 to 5.2, and further selected to be 3 to 4.5, so as to further balance the sound effect and quality.

[0360] Optionally, the density of the sound unit 10 is 1 to 3 g / cm3. The smaller the density of the sound unit 10, the lower the overall mass will be. However, in view of the parts inside the sound unit 10 and the need for the strength of its own shell, it naturally has a certain density. By controlling the density of the sound unit 10 to 1 to 3 g / cm3, it is beneficial to reduce the mass of the entire machine and improve wearing comfort. The density of the sound unit 10 can be adjusted by controlling the thickness and material of the housing assembly 100. For example, reducing the thickness of the housing assembly 100 can reduce the density. The material of the housing assembly 100 can be PC, ABS, PC + glass fiber, or PPA + glass fiber, etc. The density of these materials ranges from approximately 1 to 1.5 g / cm3. By selecting different materials, the density of the housing assembly 100 can be changed. In some examples, the material of the housing assembly 100 is set to PC + glass fiber, and the maximum wall thickness (excluding the connection with the ear hook) does not exceed 3 mm. The thickness of the circuit board (such as the adapter circuit board 13 described below) can also be reduced, or an FPC can be used instead of a PCB, which can effectively control the density of the sound unit 10 to 1 to 3 g / cm3. The density of the sound unit 10 can also be adjusted by changing the density of the bone conduction sound device 2 and the air conduction sound device 3.

[0361] The density of the bone conduction sound-generating device 2 is greater than that of the sound-generating unit 10. Optionally, the ratio of the density of the bone conduction sound-generating device 2 to the density of the sound-generating unit 10 is 1.3 to 5, and further optionally 2 to 4. The higher density of the bone conduction sound-generating device 2 allows for the use of more soft magnetic and permanent magnetic materials to improve sensitivity. Lightweight materials can be used as much as possible for other earphone headband materials to reduce weight.

[0362] Optionally, the density of the bone conduction sound device 2 is 4-5 g / cm³, and the density of the air conduction sound device 3 is 2.5-5 g / cm³. Further optionally, the ratio of the density of the bone conduction sound device 2 to the air conduction sound device 3 is 0.8-2, and further optionally 1.1-1.8. The bone conduction sound device 2 has a large vibrating mass, and to provide sufficient driving force, a larger BL value is required. Within the same headphone system, the BL value of the bone conduction sound device 2 generally needs to be greater than the BL value of the air conduction sound device 3. To increase the BL value of the bone conduction sound device 2, the mass ratio of the bone conduction magnetic circuit component 21 must be large. The density of the material of the bone conduction magnetic circuit component 21 is relatively high, so the overall density is relatively high. The vibrating mass of the air conduction sound device 3 is small, and the driving force required to achieve sufficient sensitivity is relatively small. Therefore, a smaller air conduction magnetic circuit component 31 can be used, and its density can be set to be smaller than that of the bone conduction sound device 2, which is beneficial for reducing mass.

[0363] In some embodiments, the vibrator-to-stator mass ratio of the bone conduction sound-generating device 2 is 1.3 to 3.5. A larger vibrator mass increases the mass of the bone conduction magnetic circuit assembly 21, thereby providing greater driving force and improving the sensitivity of the bone conduction sound-generating device 2. However, if the stator mass is too small, for example, if the mass of the bone conduction bracket 20 is small, its magnetic conductivity may be affected, which in turn reduces the driving force and sensitivity. Setting the vibrator-to-stator mass ratio of the bone conduction sound-generating device 2 to 1.3 to 3.5 is beneficial for achieving optimal driving force and sensitivity. Optionally, the vibrator mass of the bone conduction sound-generating device 2 (including the total mass of the bone conduction magnetic circuit assembly 21, the spring 23, etc.) is 2 to 2.8 g, and the stator mass of the bone conduction sound-generating device 2 (including the total mass of the bone conduction magnetic circuit assembly 21, the spring 23, etc.) is 0.8 to 1.5 g. The vibrator mass can be coordinated with the K value of the spring 23 to achieve a desired F0 range. Therefore, the low-frequency F0 can be adjusted (for example, to 100-300 Hz) by adjusting the vibrator mass and the stiffness coefficient of the spring 23. The stator mass affects the high-frequency cutoff frequency of the bone conduction sound generator 2. A mass range of 0.8-1.5g falls within a smaller stator mass range, which can shift the high-frequency cutoff frequency backward, thereby improving mid- and high-frequency sensitivity.

[0364] As a further improvement, the mass ratio of the vibrator to the stator of the bone conduction sound generator 2 is 1.8 to 2.8 to further ensure that the bone conduction sound generator 2 has better driving force and sensitivity. Optionally, the mass of the vibrator of the bone conduction sound generator 2 is 2.3g to 2.6g, and the mass of the stator of the bone conduction sound generator 2 is 1 to 1.3g.

[0365] Optionally, ...

Claims

1. A sound unit, characterized in that: include: A housing component (100) and a bone conduction sound generating device (2) and an air conduction sound generating device (3) both disposed within the housing component (100), wherein the housing component (100) comprises a contact surface (10010) for contacting human skin and a sound outlet (1003) for transmitting sound from the air conduction sound generating device (3); The sound-generating unit (10) has a mid-plane (10a) perpendicular to its width direction, and the center of gravity of the bone conduction sound-generating device (2) and the center of gravity of the air conduction sound-generating device (3) are respectively located on both sides of the mid-plane (10a); The distance D16 between the center of gravity of the bone conduction sound generating device (2) and the middle surface (10a) is smaller than the distance D17 between the center of gravity of the air conduction sound generating device (3) and the middle surface (10a).

2. The sound unit according to claim 1, wherein The mass of the bone conduction sound generating device (2) is greater than the mass of the air conduction sound generating device (3).

3. The sound unit according to claim 1, wherein: The ratio of the mass of the bone conduction sound generating device (2) to the mass of the air conduction sound generating device (3) is 2 to 6, and the ratio of the distance D17 to the distance D16 is 2 to 6.

4. The sound unit according to claim 1, wherein: The ratio of the distance D17 to the distance D16 is M, the ratio of the mass of the bone conduction sound generating device (2) to the mass of the air conduction sound generating device (3) is N, and the ratio of M to N is 0.7 to 1.

3.

5. The sound unit according to claim 1, wherein: The volume of the sound unit is 2500~5500mm³; The volume ratio of the bone conduction sound generating device (2) to the sound generating unit (10) is 0.12-0.32; The volume ratio of the air-conduction sound-generating device (3) to the sound-generating unit (10) is 0.03-0.

18.

6. The sound unit according to claim 5, wherein: The volume ratio of the bone conduction sound generating device (2) to the sound generating unit (10) is 0.18-0.28; The volume ratio of the air-conduction sound-generating device (3) to the sound-generating unit (10) is 0.06-0.

12.

7. The sound unit according to claim 5, wherein: The volume of the bone conduction sound generating device (2) is 600-1000 mm³, and the volume of the air conduction sound generating device (3) is 180-500 mm³.

8. The sound unit according to claim 7, wherein: The volume of the bone conduction sound generating device (2) is 700-900 mm³, and the volume of the air conduction sound generating device (3) is 220-360 mm³.

9. The sound unit according to claim 1, wherein: The volume of the bone conduction sound generating device (2) is greater than the volume of the air conduction sound generating device (3), and the volume ratio of the bone conduction sound generating device (2) to the air conduction sound generating device (3) is 1.5-4.

5.

10. The sound unit according to claim 9, wherein: The volume ratio of the bone conduction sound generating device (2) to the air conduction sound generating device (3) is 2 to 3.

6.

11. The sound generating unit according to any one of claims 1 to 10, characterized in that: The housing assembly (100) comprises a housing (1000) and a face cover (1001) connected to the housing (1000); the housing (1000) comprises a side housing portion (1004) and a back cover (1002) connected to the side housing portion (1004); the bone conduction sound generating device (2) is connected to the face cover (1001) and / or the back cover (1002), and the positive direction of its vibration direction A points to the contact surface (10010) between the face cover (1001) and the human body; and the angle α1 between the vibration direction A and the contact surface (10010) is 60-90°; The air-conducting sound-generating device (3) is connected to the side shell portion (1004), and the positive direction of its vibration direction B points to the side shell portion (1004), and the angle α2 between the vibration direction B of the air-conducting sound-generating device (3) and the contact surface (10010) is 0-45°.

12. The sound unit according to claim 11, wherein: The vibration direction A is perpendicular to the contact surface (10010), the vibration direction A is perpendicular to the vibration direction B, and the distance L8 between the bone conduction sound generating device (2) and the air conduction sound generating device (3) is 0.3 mm to 6 mm.

13. The sound generating unit according to claim 11, wherein: The housing assembly (100) comprises a front cavity (10042) and a rear cavity (10044) separated by a diaphragm (321) of the air-conducting sound-generating device (3); the front cavity (10042) is connected to the sound outlet (1003); and the housing (1000) is provided with one or more through holes (10000) connected to the rear cavity (10044).

14. The sound unit according to claim 13, wherein: The total area of ​​all the sound holes (1003) is 10-130 mm², the volume of the front cavity (10042) is 10-250 mm³, and the total area of ​​all the through holes (10000) is in the range of 1-80 mm².

15. The sound unit according to claim 14, wherein: The total area of ​​all the sound holes (1003) is 40-100 mm², the volume of the front cavity (10042) is 50-200 mm³, and the total area of ​​all the through holes (10000) is in the range of 5-40 mm².

16. The sound generating unit according to any one of claims 1 to 10, characterized in that: The air conduction sound emitting device (3) is located on one side of the width direction of the bone conduction sound emitting device (2); the bone conduction sound emitting device (2) and the air conduction sound emitting device (3) are in the shape of long strips; the length-to-width ratio of the bone conduction sound emitting device (2) is 1.3-3; the length-to-width ratio of the air conduction sound emitting device (3) is 1.3-3; the bone conduction sound emitting device (2) and the air conduction sound emitting device (3) are both arranged along the length direction of the sound emitting unit (10); The bone conduction sound generating device (2) and the air conduction sound generating device (3) are located in the same cavity of the housing component (100) or in two independent cavities; The distance L8 between the air conduction sound generating device (3) and the bone conduction sound generating device (2) is 0.3-6 mm.

17. The sound generating unit according to any one of claims 1 to 10, characterized in that: The bone conduction sound generating device (2) comprises: A bone conduction stent (20), wherein the bone conduction stent (20) is ring-shaped; A bone magnetic conduction circuit component (21) is provided in the bone conduction support (20), comprising at least one magnet (210) and at least two magnetic conduction plates (211), wherein one magnet (210) is connected between two adjacent magnetic conduction plates (211); A bone conduction coil (22) is disposed in the bone conduction support (20) and fixed relative to the bone conduction support (20), and at least one of the magnetic conductive plates (211) is surrounded by the bone conduction coil (22); and Two spring pieces (23), the two spring pieces (23) are respectively connected to two ends of the bone conduction magnetic circuit component (21) along the vibration direction A of the bone conduction sound generating device (2).

18. The sound unit according to claim 17, wherein: The air conduction sound generating device (3) comprises: An air conduction stent (30), wherein the air conduction stent (30) is ring-shaped; An air-conducting magnetic circuit assembly (31) is provided in the air-conducting support (30), comprising a magnetic conductive base plate (3100), a main magnet (311) connected to the magnetic conductive base plate (3100), and a main pole core plate (313) connected to the main magnet (311); the air-conducting magnetic circuit assembly (31) further comprises a magnetic conductive side plate (3101) connected to the magnetic conductive base plate (3100) and / or a secondary magnet (312) connected to the magnetic conductive base plate (3100), and a secondary pole core plate (314) connected to the secondary magnet (312); an air-conducting magnetic gap (315) is formed between the magnetic conductive side plate (3101) and / or the secondary pole core plate (314) and the main pole core plate (313); and, A diaphragm assembly (32) comprises a diaphragm (321) connected to the air conduction support (30) and an air conduction coil (320) connected to the diaphragm (321), wherein the air conduction coil (320) is located in the air conduction magnetic gap (315).

19. The sound unit according to claim 18, wherein: The bone conduction support (20) is made of a magnetic conductive material, and the diaphragm assembly (32) is arranged relative to the bone conduction support (20), or the magnetic conductive base plate (3100) is arranged relative to the bone conduction support (20).

20. The sound generating unit according to claim 17, wherein: At least one inductance adjustment hole (2112) is provided on the outer end surfaces of the two outermost magnetic conductive plates (211) facing away from the magnet (210), and the inductance adjustment hole (2112) passes through both end surfaces of the magnetic conductive plates (211) along the vibration direction A; The total area of ​​all the inductance adjustment holes (2112) accounts for 3-8% of the area of ​​the magnetic conductive plate (211).

21. A head-mounted sound device, characterized in that: include: Two sound generating units (10) according to any one of claims 1 to 20; Two functional compartments, the functional compartments being used to accommodate a control circuit board and / or a battery, the sound outlet holes (1003) being provided on the end surface of the housing component (100) facing the functional compartments; an ear hook (111), adapted to be hooked on an ear, wherein the housing component (100) and the functional compartment are connected via the ear hook (111); and The rear hanging (110) is suitable for surrounding the back of the head and is connected between the two functional compartments.

22. The head-mounted sound device according to claim 21, wherein: A control circuit board (1124) is provided in at least one of the functional compartments, and the sound-generating unit (10) further includes a switching circuit board (13) provided in the housing assembly (100); The bone conduction sound generating device (2) is electrically connected to the control circuit board (1124) via the adapter circuit board (13), or is directly electrically connected to the control circuit board via a cable (1125); The air conduction sound generating device (3) is electrically connected to the control circuit board via the adapter circuit board (13).

23. The head-mounted sound generating device according to claim 22, wherein: An external circuit board (25) is provided on the outer surface of the bone conduction sound generating device (2), and the housing assembly (100) comprises a housing (1000) and a cover (1001) connected to the housing (1000); The adapter circuit board (13) is connected to the inner side wall of the housing (1000) and is arranged opposite to the external circuit board (25); or, The adapter circuit board (13) is connected to the inner bottom wall of the housing (1000).

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