Sound production unit and head-mounted sound production equipment

Abstract

The utility model discloses a sounding unit and a head-mounted sounding device, and relates to the sounding device technology field, the sounding unit comprises a housing assembly and a bone conduction sounding device and an air conduction sounding device which are arranged in the housing assembly, and the air conduction sounding device comprises an air conduction support, an air conduction magnetic circuit assembly and a diaphragm assembly. The air-conducting magnetic circuit assembly comprises a magnetic-conducting bottom plate, a main magnet, a main pole core plate and a magnetic-conducting side plate, and an air-conducting magnetic gap is formed between the magnetic-conducting side plate and the main pole core plate; the vibrating diaphragm assembly comprises a vibrating diaphragm and an air conducting coil, the air conducting coil is located in the air conducting magnetic gap, the two ends of the air conducting coil extend to the two ends exceeding the thickness direction of the main pole core plate, the height H7 of the air conducting coil is 0.9-1.8 mm, the wall thickness B6 of the air conducting coil is 0.08-0.3 mm, the wall thickness B6 of the air conducting coil is small, a magnetic field can pass through the air conducting coil more evenly, the height H7 of the air conducting coil is relatively large, and the air conducting coil is not prone to falling off. The magnetic field generated by the air conduction magnetic circuit assembly can be fully utilized, and the sensitivity can be improved.

Description

[0001] Priority information: This application claims priority to Chinese patent application No. 202411044063.7 filed on July 31, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The utility model relates to the technical field of sound-generating devices, in particular to a sound-generating unit and a head-mounted sound-generating device. Background Art

[0003] 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.

[0004] 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.

[0005] An air conduction sound-generating device usually 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 is driven to vibrate under the interaction with the magnetic force of the magnetic circuit assembly, thereby stirring the air to produce sound.

[0006] 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.

[0007] For example, conventional headphones are typically equipped with only a bone conduction sound generator or an 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 a bone conduction sound generator and an air conduction sound generator are installed in a single sound generation unit, it can help improve the sound generation effect and expand the sound generation methods. However, due to the small space inside the headphone head, the air conduction sound generator cannot be made too large due to the size of the internal space of the headphone head, which can easily lead to low sensitivity and poor acoustic effect. Bone conduction sound generators also have similar problems. How to improve the sensitivity of the sound generator has become a problem that needs to be solved.

[0008] In addition, 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).

[0009] 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

[0010] The purpose of the utility model is to provide a sound unit and a head-mounted sound device to improve the sensitivity of the sound device.

[0011] To achieve the above-mentioned purpose, the present invention provides a sound-generating unit, including: a housing assembly, a bone conduction sound-generating device and an air conduction sound-generating device, both of which are provided in the housing assembly. The air conduction sound-generating device includes:

[0012] Utility model for air conduction stent;

[0013] An air-conducting magnetic circuit assembly is provided in the air-conducting bracket, comprising a magnetic conductive bottom plate, a main magnet connected to the magnetic conductive bottom plate, and a main pole core plate connected to the main magnet. The air-conducting magnetic circuit assembly further comprises a magnetic conductive side plate connected to the magnetic conductive bottom plate, an air-conducting magnetic gap being formed between the magnetic conductive side plate and the main pole core plate; and

[0014] The diaphragm assembly utility model includes a diaphragm utility model connected to the air conduction bracket utility model and an air conduction coil utility model connected to the diaphragm utility model, the air conduction coil utility model is located in the air conduction magnetic gap utility model, and the two ends of the air conduction coil utility model extend beyond the two ends of the main pole core plate utility model in the thickness direction, the height H7 of the air conduction coil utility model is 0.9~1.8mm, and the wall thickness B6 of the air conduction coil utility model is 0.08~0.3mm.

[0015] On the other hand, the present invention provides a head-mounted sound-emitting device, comprising the sound-emitting unit described above.

[0016] Compared with the prior art, the present invention has the following beneficial effects: the sound unit of the head-mounted sound device includes both a bone conduction sound device and an air conduction sound device, and can utilize both the bone conduction sound device and the air conduction sound device to produce sound, which is beneficial for improving the listening effect. Furthermore, in the air conduction magnetic circuit assembly, the ends of the air conduction coil extend beyond the ends in the thickness direction of the main pole core plate, the height H7 of the air conduction coil is 0.9 to 1.3 mm, and the wall thickness B6 of the air conduction coil is 0.12 to 0.3 mm. The relatively thin wall thickness B6 of the air conduction coil can make the magnetic field pass through the air conduction coil more uniform, and the relatively high height H7 of the air conduction coil can more fully utilize the magnetic field generated by the air conduction magnetic circuit assembly, which is beneficial for improving sensitivity, thereby making the sound unit have better sensitivity and sound effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a head-mounted sound-generating device in some embodiments of the present invention.

[0018] Figure 2 1 is a schematic cross-sectional view of a sound unit in some embodiments of the present invention, in which the housing is integral.

[0019] Figure 3 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.

[0020] Figure 4 It is a schematic structural diagram of the sound-generating unit of some embodiments of the present invention.

[0021] Figure 5 yes Figure 4 An exploded view of the sound unit is shown.

[0022] Figure 6a yes Figure 4 A schematic cross-sectional view of the sound unit shown.

[0023] Figure 6b It is a schematic structural diagram of the sound-generating unit of some embodiments of the present invention.

[0024] Figure 6c This is a schematic diagram of the structure of the sound unit in some embodiments of the present invention. In the figure, the structure of the bone conduction magnetic circuit component is the same as Figure 11a Consistent in.

[0025] Figure 7a It is a schematic structural diagram of the bone conduction sound generating device of some embodiments of the present invention.

[0026] Figure 7b yes Figure 7a A cross-sectional schematic diagram of the bone conduction sound device shown.

[0027] Figure 8 This is a cross-sectional view of the bone conduction sound generating device in some embodiments of the present invention. Figure 11a Consistent in.

[0028] Figure 9 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.

[0029] Figure 10a It is a schematic structural diagram of the bone magnetic circuit assembly of some embodiments of the present invention.

[0030] Figure 10b yes Figure 10a The bone magnetic circuit assembly shown is a schematic diagram of an integrated part.

[0031] Figure 11aIt is a schematic structural diagram of the bone magnetic circuit assembly of some embodiments of the present invention.

[0032] Figure 11b yes Figure 11a The bone magnetic circuit assembly shown is a schematic diagram of an integrated part.

[0033] Figure 12a It is a schematic structural diagram of the bone magnetic circuit assembly of some embodiments of the present invention.

[0034] Figure 12b yes Figure 12a The bone magnetic circuit assembly shown is a schematic diagram of an integrated part.

[0035] Figure 13a It is a schematic structural diagram of the bone magnetic circuit assembly of some embodiments of the present invention.

[0036] Figure 13b yes Figure 13a The bone magnetic circuit assembly shown is a schematic diagram of an integrated part.

[0037] Figure 14 yes Figure 7a A side view of the bone conduction sound device is shown.

[0038] Figure 15 yes Figure 7a Schematic diagram of the structure of the shrapnel.

[0039] Figure 16 It is a schematic structural diagram of the spring pieces in some embodiments of the present invention.

[0040] Figure 17 It is a schematic structural diagram of the spring pieces in some embodiments of the present invention.

[0041] Figure 18 It is a schematic cross-sectional view of the bone conduction sound generating device of some embodiments of the present invention.

[0042] Figure 19 yes Figure 7b Enlarged view of part I in the middle.

[0043] Figure 20a It is a cross-sectional view of the bone conduction sound generating device of some embodiments of the present invention.

[0044] Figure 20b This is a cross-sectional view of the bone conduction sound generating device in some embodiments of the present invention. The structure of the bone conduction magnetic circuit component in the figure is the same as that in the embodiment of the present invention. Figure 11a Consistent in.

[0045] Figure 21 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.

[0046] Figure 22 Schematic diagram of the winding of the bone conduction coil in some embodiments of the present invention.

[0047] Figure 23a It is a schematic cross-sectional view of the bone conduction sound generating device of some embodiments of the present invention.

[0048] Figure 23b This is a cross-sectional view of a bone conduction sound generating device in some embodiments of the present invention. In the figure, the structure of the bone conduction magnetic circuit component is Figure 11a Consistent in.

[0049] Figure 24 It is a schematic structural diagram of the air conduction sound generating device of some embodiments of the present invention.

[0050] Figure 25 yes Figure 24 A top view of the air conduction sound generating device is shown.

[0051] Figure 26 It is along Figure 25 Sectional view obtained by cutting along the MM cutting line.

[0052] Figure 27 It is a top view of the magnetic support member of some embodiments of the present invention.

[0053] Figure 28 It is a top view of the magnetic support member of some embodiments of the present invention.

[0054] Figure 29 It is a top view of the magnetic support member of some embodiments of the present invention.

[0055] Figure 30 It is a schematic structural diagram of the air conduction sound generating device of some embodiments of the present invention.

[0056] Figure 31 yes Figure 30 A cross-sectional view of the air conduction sound generating device shown.

[0057] Figure 32 yes Figure 31 Enlarged view of part III.

[0058] Figure 33 yes Figure 30 The diagram shows the positions of the magnetic support, main magnet and main pole core plate of the air conduction sound generating device.

[0059] Figure 34 It is along Figure 26 Sectional view obtained by cutting along the JJ cutting line.

[0060] Figure 35It 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.

[0061] Figure 36 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.

[0062] Figure 37 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.

[0063] Figure 38 yes Figure 26 The schematic diagram of the structure of the air-conducting magnetic circuit component of the air-conducting sound-generating device shown.

[0064] Figure 39 yes Figure 26 Enlarged view of part II.

[0065] Figure 40 yes Figure 30 Exploded diagram of the diaphragm assembly.

[0066] Figure 41 yes Figure 24 Schematic diagram of the structure of the diaphragm assembly.

[0067] Figure 42 yes Figure 24 The diagram shows an air conduction sound generating device provided with double-sided tape. DETAILED DESCRIPTION

[0068] 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.

[0069] 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.

[0070] 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.

[0071] The area of a hole mentioned in this article refers to the area of the region enclosed by the outer contour of the hole.

[0072] Unless otherwise specified, the dimensions or dimension ranges such as "length", "width", "height", "thickness", and "wall thickness" mentioned in this article refer to the dimensions or dimension ranges of the largest part in the corresponding direction.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] The following description uses a binaural headset as an example.

[0077] like Figure 1 As shown, Figure 1 The 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. It can be understood that the rear hook 110, the ear hook 111 and the two functional compartments together constitute the wearing mechanism 11 of the earphone.

[0078] 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.

[0079] The head-mounted sound device is symmetrical as a whole to improve wearing comfort. Figure 1 As shown, the sound unit 10 has a contact surface 10010 that contacts human skin when the head-mounted sound device is worn.

[0080] 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 2 As shown, the housing assembly 100 includes a shell 1000 with an open end and a face cover 1001 that seals the open end of the shell 1000. The shell 1000 is integrally formed, and 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. It is understandable that the surface of the face cover 1001 that is in contact with the facial skin is the contact surface 10010. In other embodiments, such as Figure 3As 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.

[0081] 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 .

[0082] 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.

[0083] In some embodiments, as Figure 2 and Figure 3 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.

[0084] 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.

[0085] Figures 4 to 6a This 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.

[0086] In some embodiments, the air conduction sound emitting device 3 is located on one side of the width direction of the bone conduction sound emitting device 2, and the air conduction sound emitting device 3 and the bone conduction sound emitting device 2 are arranged along the width direction Y of the sound emitting unit 10, so that the arrangement of the air conduction sound emitting device 3 and the bone conduction sound emitting device 2 is more reasonable, the structure is more compact, space is saved and the weight distribution is optimized, which is conducive to controlling the mass and volume of the sound emitting unit 10 within a smaller range. The sound emitting unit 10 can have a suitable shape and volume, will not be too long to cause discomfort when wearing, and is conducive to the air conduction sound emitting device 3 being close to the ear to emit sound. The length direction X, width direction Y and thickness (or height) direction Z of the sound emitting unit 10 can refer to Figure 4 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.

[0087] The air conduction sound device 3 and the bone conduction sound device 2 are in the shape of an elongated strip, with a length greater than a width. For example, the outer contour of the cross section 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 connecting shapes between the long and short sides, such as curves, etc.) or runway-shaped. It is understood that the rectangular or runway-shaped outer contour of the cross section of the air conduction sound device 3 and the bone conduction sound device 2 does not mean that the outer contour must be strictly rectangular or runway-shaped geometrically, and may also be approximately rectangular or runway-shaped. Optionally, the bone conduction sound device 2 is arranged along the length direction of the sound unit 10 (for example, the length direction of the bone conduction sound device 2 may be consistent with the projection of the length direction of the sound unit 10 on the XY plane, or the two may form an angle of no more than 30°) to increase the volume of the bone conduction sound device 2, increase its sound pressure level, reduce distortion, and improve its sound effect. Optionally, the bone conduction sound emitting device 2 is aligned with the length of the sound unit 10 along its length. Optionally, the housing assembly 100 has a generally rectangular cavity, so that it is smaller in size while achieving the desired performance, and the internal space utilization rate is higher. Optionally, the bone conduction sound emitting device 2 and the air conduction sound emitting device 3 are generally rectangular parallelepiped, and the outer contour of their cross-section is generally rectangular, so as to more fully utilize the space inside the housing assembly 100, making the entire sound unit 10 structure more compact, and minimizing the volume of the sound unit 10 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 emitting device 2 and the air conduction sound emitting device 3 in the earphone head.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] The frequency response curves of both the bone conduction sound generator 2 and the air conduction sound generator 3 have a low-frequency resonance point (F0), which can be 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. The number of sound outlets 1003 can be one or more, for example, one, two, three, or more.

[0092] 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.

[0093] 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.

[0094] 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 6a 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 6b 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.

[0095] Optionally, the outer contour of the cross section of the air-conducting sound-generating device 3 perpendicular to the vibration direction B is roughly rectangular, and the outer contour of the cross section of the front cavity 10042 perpendicular to the vibration direction B 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.

[0096] In some embodiments, the bone conduction sound emitting device 2 and the air conduction sound emitting device 3 are located in the same cavity of the outer shell component 100. On the one hand, the outer shell component 100 can have a larger rear cavity 10044, thereby reducing the F0 of the air conduction sound emitting device 3 and improving the low-frequency effect. On the other hand, the internal space of the outer shell component 100 can be effectively utilized, and the spatial arrangement of the two sound emitting devices in the earphone head can be reasonably arranged. Compared with separating the two bone conduction sound emitting devices 2 and the air conduction sound emitting device 3 by a partition, it is beneficial to make the entire earphone head smaller and more compact. At the same time, because the volume of the earphone head is reduced, the volume of the shell is also reduced accordingly, which can reduce the weight of the entire earphone head and reduce the sense of weight when worn. The weight reduction is also beneficial to improving the frequency response of the high-frequency band of the bone conduction sound transmission part and improving the sound quality of the high-frequency band. In some embodiments, reference Figure 6a The shell 1000 is provided with a through hole 10000 connecting the inside and the outside thereof. For example, one or more (in this specification, multiple includes two or more) through holes 10000 can 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 increase the rear cavity 10044 of the air conduction sound emitting device 3, thereby reducing F0 and improving low-frequency sensitivity.

[0097] In other embodiments, the bone conduction sound emitting device 2 and the air conduction sound emitting device 3 can be respectively arranged in two independent cavities, for example, separated by a partition to reduce mutual interference in work. Optionally, the cavity where the air conduction sound emitting device 3 is located is provided with a through hole 10000 communicating with the outside world. The parameters of the through hole 10000 can refer to the above. Alternatively, the cavity where the bone conduction sound emitting device 2 is located is provided with a through hole 10000, and a channel connecting the two cavities is provided on the partition.

[0098] 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 26 and Figure 31 ) and the like are connected to the inner wall. In other embodiments, in order to further reduce the occupation of the internal space of the housing assembly 100 by the air conduction sound emitting device 3, the air conduction sound emitting device 3 can be embedded in the side shell portion 1004 to reduce the occupation of the internal space of the housing assembly 100 by the air conduction sound emitting device 3, thereby facilitating the miniaturization of the sound unit 10. In addition, the firmness of the connection between the air conduction sound emitting device 3 and the side shell portion 1004 can also be improved. The air conduction sound emitting device 3 is at least partially embedded in the side shell portion 1004, for example, referring to Figure 4 and Figure 5The 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. The mounting groove 10041 not only saves space occupied by the air conduction sound-generating device 3, but also serves to position the air conduction sound-generating device 3. Compared to a solution in which the air conduction sound-generating device 3 is attached to the inner wall of the side shell portion 1004, there is no need for an additional limiting structure. Furthermore, the mounting groove 10041 increases the contact area between the air conduction sound-generating device 3 and the housing assembly 100, and also increases the secureness of the installation of the air conduction sound-generating device 3. Optionally, the depth D14 of the mounting groove 10041 is 0.3 to 1.5 mm, and the air-conducting sound-generating device 3 has a sufficient embedding depth, thereby increasing the reliability of positioning and connection. At the same time, the wall thickness of the side shell portion 1004 for mounting the air-conducting sound-generating device 3 is not too thick, which is beneficial to reducing the mass of the sound-generating unit 10.

[0099] refer to Figure 5 and Figure 6a The 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.

[0100] Next, the bone conduction sound emitting device 2 of the sound emitting unit 10 is described with an example.

[0101] 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.

[0102] Figure 7a is a schematic structural diagram of a bone conduction sound generating device 2 according to some embodiments of this specification. Figure 7b yes Figure 7a The cross-sectional view of the bone conduction sound generating device 2 is shown in FIG. Figure 8Figure 2 is a schematic cross-sectional view of a bone conduction sound-generating device 2 according to another embodiment. 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. The spring 23 is 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 the face cover 1001 to transmit vibrations to the face cover 1001. For example, the connection to the face 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.

[0103] 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 9 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.

[0104] 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. When all magnetic conductive plates 211 are surrounded by bone conduction coils 22, the number of bone conduction coils 22 corresponds to the number of magnetic conductive plates 211. Optionally, at least two magnetic conductive plates 211 are surrounded by a bone conduction coil 22 to increase the driving force of the bone conduction coils 22 and improve the volume. In other embodiments, only one magnetic conductive plate 211 may be surrounded by a bone conduction coil 22.

[0105] Figure 7b 、 Figure 10a 、 Figure 11a 、 Figure 12a 、 Figure 13a 、 Figure 20a as well as Figure 20b A schematic structural diagram of a bone magnetic circuit assembly 21 according to some embodiments of this specification is shown.

[0106] Figure 7b 、 Figure 10a and Figure 20a 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 7b 、 Figure 10a 、 Figure 20a and Figure 20b The difference between the structures shown is that Figure 7b The magnetic conductive plate 211 shown is provided with a boss 2113 and a recess 2114. Figure 10a The magnetic conductive plate 211 shown is provided with a boss 2113 but not a recess 2114. Figure 20a The magnetic conductive plate 211 of the structure shown is connected to a gasket 26. Figure 20b The magnet 210 of the illustrated structure has a spacer 26 attached thereto.

[0107] Figure 11a 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.

[0108] Figure 12a 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.

[0109] Figure 13a 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.

[0110] 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.

[0111] The bone conduction magnetic circuit components 21 mentioned above can be installed in the bone conduction sound generating device 2 and assembled into the sound generating unit 10, for example, Figure 8 and Figure 6c That is, respectively showing the Figure 11a The bone conduction magnetic circuit assembly 21 shown is applied to the bone conduction sound emitting device 2 and the sound emitting unit 10 .

[0112] Next, the bone conduction support 20 of the bone conduction sound generating device 2 is described with an example.

[0113] 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.

[0114] like Figure 7a and Figure 7b 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 formed on the outer wall 203 of the bone conduction bracket 20, facing the connection 111a between the ear hook 111 and the housing assembly 100, to facilitate wiring and routing. Furthermore, the outlet hole 201 may be connected to the end surface 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 surface 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 holes 201 are symmetrically provided on two opposite side walls of the bone conduction support 20 to prevent reverse installation and facilitate wire routing. Figure 7b In the illustrated embodiment, the two lead wires 220 of the bone coil 22 are located on the end of the bone coil 22 away from the magnet 210 .

[0115] The wire outlet holes 201 can reduce the mass of the stator portion of the bone conduction sound generating device 2. Generally, the lighter the stator portion, the higher the mid- and high-frequency sensitivity of the bone conduction sound generating device 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, thereby reducing the mass of the stator portion and improving mid- and high-frequency sensitivity. The outer circumference of the bone conduction bracket 20 refers to the outer surface between the two end surfaces of the bone conduction bracket 20 in the vibration direction A, which is substantially the same as the outer circumference of the bone conduction sound generating device 2. Generally, a 0.5% area ratio of the wire outlet holes 201 can reduce the weight by approximately 5 mg, a 1% area ratio can reduce 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 wire hole 201 area, and helps ensure the strength of the bone conduction bracket 20. The outer peripheral area of the bone conduction bracket 20 refers to the sum of the areas of its external side surfaces, including the area of the wire hole 201. When the outer peripheral area of the bone conduction bracket 20 is approximately parallel to the axis of the bone conduction bracket 20, the outer peripheral area can be calculated by multiplying the outer perimeter of the cross-section of the outer peripheral area of the bone conduction bracket 20 by the height of the bone conduction bracket 20.

[0116] 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 7a and Figure 7b 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 support 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 support 20, facing the connection 111a between the ear hook 111 and the housing assembly 100, to facilitate 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 of 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 coils 22 can also be changed by changing the connection position of the coil leads to the solder pads on the external circuit board 25, as well as the circuit design on the external circuit board 25. In some embodiments, the external circuit board 25 and the wire outlet 201 are located at one end of the length direction of the bone conduction support 20, and the wire outlet 201 is not adjacent to the diaphragm 321. Figure 14 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 14 In 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.

[0117] Next, the spring piece 23 of the bone conduction sound generating device 2 is described with an example.

[0118] The number of the springs 23 can be one, two or more. Figure 7a and Figure 7b 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 15The 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.

[0119] In some embodiments, reference Figure 15 , the outer frame 230 is continuous and annular. In other embodiments, the outer frame 230 is discontinuous, referring to Figure 16 , which can be in the form of a discontinuous ring (or discontinuous ring), or, referring to Figure 17 , 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.

[0120] 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.

[0121] 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.

[0122] 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 25 The elastic piece 23 shown includes two elastic arms 232 arranged symmetrically with respect to the center. The elastic arm 232 of the elastic piece 23 has an inner connecting portion 2320 connected to the inner frame 231 and an outer connecting portion 2321 connected to the outer frame 230 .

[0123] Next, the bone conduction coil 22 of the bone conduction sound generating device 2 and its installation method are described with examples.

[0124] refer to Figure 19 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.

[0125] Figure 21A simulation diagram shows the BL value when a bone conduction coil 22 of different heights is installed on a bone conduction sound generating device 2 according to an embodiment of this specification. 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, as the height H4 of the bone conduction coil 22 increases, the BL value generally 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. Smaller wall thickness B3 and height H4 of the bone conduction coil 22 result in a more uniform magnetic field passing through the bone conduction coil 22. However, this reduces the strength of the bone conduction coil 22, making it more susceptible to damage during assembly or operation. Furthermore, the coil's wire length is shorter, affecting sensitivity. A thicker wall thickness B3 of the bone conduction coil 22 increases sensitivity, but also increases the mass and volume of the bone conduction sound generating device 2. A relatively high height H4 of the bone conduction coil 22 allows for more efficient utilization of the magnetic field generated by the bone magnetic circuit assembly 21, facilitating improved sensitivity. However, as the distance from the magnetic plate 211 increases, the magnetic flux lines become sparser. Further increasing the height of the bone conduction coil 22 after a certain height decreases the sensitivity benefit, and excessive height may result in wasted space. Setting the height H4 of the bone conduction coil 22 to 1.5-2.5 mm and the wall thickness B3 of the bone conduction coil 22 to 0.35-0.6 mm creates a more appropriate height and wall thickness for the bone conduction coil 22, ensuring structural strength and sensitivity while controlling the mass and volume of the bone conduction sound generating device 2. Setting the ratio of the height H4 of the bone conduction coil 22 to the wall thickness B3 of the bone conduction coil 22 to a range of 3.5-4.5 achieves an optimal balance between space utilization and improved sensitivity.

[0126] 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.

[0127] 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 22The 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 along the coil axis from bottom to top (or from top to bottom), 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 turns 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 22 The 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.

[0128] In some embodiments, reference Figure 18 , 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 19 、 Figure 23a and Figure 23b 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.

[0129] 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.

[0130] It is understandable that the bone magnetic circuit assembly 21 can be formed by connecting multiple parts (split type), and can also be formed by integral magnetization if the structure can be realized. 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. There is no need to connect them through a connection process to form the bone magnetic circuit assembly 21. Therefore, the bone magnetic circuit assembly 21 formed by integral magnetization usually has higher dimensional accuracy. It should be noted that the bone magnetic circuit assembly 21 is integral, which means that at least the whole formed by the magnet 210 and the magnetic plate 211 is an integral single part, and the spacer used by the bone magnetic circuit assembly 21 to connect to the spring 23 can be an independent part or an integral part. For example, Figure 10b 、 Figure 11b 、 Figure 12b and Figure 13b Shown respectively with Figure 10a 、 Figure 11a 、 Figure 12a and Figure 13a The schematic diagram of the integrated bone magnetic circuit assembly corresponding to the split bone magnetic circuit assembly shown in the figure, in which the solid line indicates the boundary between the two independent parts, and the dotted line indicates the boundary between the different parts (magnetic plate 211 and magnet 210) in the integrated part. Figure 11b and Figure 13b The spacer (gasket 26) in the is an independent part, Figure 10b and Figure 12b The spacer (boss 2113) in the bone magnetic circuit assembly is integrated. The integrated magnetization method can be referred to the patent document with application number 202111062238.3, the entire content of which is incorporated herein by reference.

[0131] Next, the air conduction sound generating device 3 of the sound generating unit 10 is described with an example.

[0132] In some embodiments, as Figures 24 to 26 、 Figures 30 to 33As 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.

[0133] Next, the air-conduction magnetic circuit component 31 of the air-conduction sound-generating device 3 is first described with an example.

[0134] 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 .

[0135] 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 26 and Figure 31 The 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 27 to 29 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 27 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 28 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 29 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 30 to 33 As shown, Figure 31yes Figure 30 The cross-sectional view of the air conduction sound generating device 2 is shown. Figure 32 yes Figure 31 The enlarged view of Part III, Figure 33 yes Figure 30 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.

[0136] In some embodiments, reference Figure 34 , Figure 34 For the Figure 26 In 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 35 to 37 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 35 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 36 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 37In 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.

[0137] 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.

[0138] 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 38 As shown, Figure 38 Shown Figure 24 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.

[0139] 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.

[0140] 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.

[0141] In some embodiments, as Figure 32 and Figure 39 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.

[0142] Next, the diaphragm assembly 32 of the air conduction sound generating device 3 is described with an example.

[0143] like Figure 32、 Figure 39 、 Figure 40 and Figure 41 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 39 and Figure 40 ), or it may protrude in a direction away from the side where the air-conducting magnetic circuit component 31 is located (refer to Figure 32 and Figure 40 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).

[0144] 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.

[0145] Optional, such as Figure 32 and Figure 39As 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, meaning that distances L6 and L7 are closer. This reduces the size of the air-conducted sound-generating device 3 in the vibration direction B. Furthermore, when de-energized, the distance between the geometric center of the air-conducted coil 320 and the geometric center of the magnetic plate 313 is closer, making the positions of the main magnetic flux lines and the air-conducted coil 320 more symmetrical. This results in closer upper and lower amplitudes of the air-conducted coil 320 after power is applied, reducing distortion, improving sound reproduction, and ultimately enhancing sound quality. Furthermore, the ratio of distance L6 to distance L7 ranges from 0.9 to 1.1, and furthermore, 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, and furthermore, 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 the ratio is too large, space is wasted. Further optionally, the difference between the distance L6 and the distance L7 and the maximum amplitude of the diaphragm 321 is 0.1 to 0.3 mm. Figure 26 and Figure 40To enhance the strength of the intermediate sheet 3211 and improve sound quality, the diaphragm assembly 32 also includes a reinforcement sheet 3213 attached to the surface of the intermediate sheet 3211. The material of the reinforcement sheet 3213 can be the same as or different from that of the diaphragm 321. Optionally, the reinforcement sheet 3213 and the intermediate sheet 3211 have the same shape and area, thereby comprehensively reinforcing the intermediate sheet 3211. Optionally, the thickness of the reinforcement sheet 3213 ranges from 0.08 to 0.3 mm and the material of the reinforcement sheet 3213 can be a polymer, a metal, or a polymer-metal composite. Examples of polymers include polyethylene, polypropylene, polyester, polyetherimide, polyethylene terephthalate, carbon fiber composites, or pulp fiber composites. Examples of metals include aluminum, aluminum alloys, titanium, titanium alloys, laminates of aluminum-based materials and foamed materials, or laminates of titanium-based materials and foamed materials. Examples of polymer-metal composites include aluminum layers with carbon fiber as the intermediate layer. It is understandable that when the reinforcing sheet 3213 is provided, the middle sheet 3211 may not be fully enclosed. Figure 40 As shown, Figure 40 This 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.

[0146] In some embodiments, reference Figure 26 and Figure 39 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 42 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 24 and Figure 25 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.

[0147] 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.

[0148] In some embodiments, the diaphragm 321 is made of a non-silicone, low-density material, such as PAR, PEI, PEEK, PC, TPE, TPEE, or TPU, or 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, the folding ring 3212 can optionally be of uniform width and the pleated pattern 3214 described below is not provided.

[0149] Next, the air conduction coil 320 of the diaphragm assembly 32 is described with an example.

[0150] In some embodiments, as Figure 32 and Figure 39As 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. The relatively thin wall thickness B6 of the air conduction coil 320 allows for a more uniform magnetic field through the air conduction coil 320. The relatively high height H7 of the air conduction coil 320 allows for more efficient utilization of the magnetic field generated by the air conduction magnetic circuit assembly 31, thereby improving sensitivity. 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, ensuring that the air conduction coil 320 has good electroacoustic conversion efficiency and mechanical stability in the sound unit 10. If the ratio is too large, meaning the height H7 is large and the wall thickness B6 is small, the air conduction coil 320 may become too weak, resulting in mechanical deformation or damage during high-power operation. If the ratio is too small, the height H7 of the air conduction coil 320 is smaller than the wall thickness B6, and the interaction area between the magnetic field and the air conduction coil 320 is reduced, resulting in reduced sensitivity and weaker sound output of the sound unit 10.

[0151] 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.

[0152] 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, 2 layers, 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 22 , Figure 22The 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 turns 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. In this way, each outermost 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 outside. 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 .

[0153] 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 less than or equal to 0.15 mm, while the wire diameter of the air conduction coil 320 is greater than or equal to 0.035 mm and less than or equal to 0.06 mm.

[0154] 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 6a In the embodiment shown, the distance L8 is the distance between the magnetic base plate 3100 and the bone conduction support 20. Figure 6b 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 6a 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 6b 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.

[0155] 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.

[0156] It should be noted that, in the absence of conflict, the various embodiments herein can be combined with each other to obtain more implementation plans.

[0157] The above is only a specific implementation of the present invention, and any improvements made based on the concept of the present invention are considered to be within the scope of protection of the present invention.

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 of which are arranged in the housing component (100), wherein the air conduction sound generating device (3) comprises: Airway stent (30); An air-conducting magnetic circuit assembly (31) is provided in the air-conducting bracket (30), comprising a magnetic conductive bottom plate (3100), a main magnet (311) connected to the magnetic conductive bottom 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 bottom plate (3100), an air-conducting magnetic gap (315) is formed between the magnetic conductive side plate (3101) 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); the air conduction coil (320) is located in the air conduction magnetic gap (315); both ends of the air conduction coil (320) extend beyond both ends in the thickness direction of the main pole core plate (313); a height H7 of the air conduction coil (320) is 0.9 to 1.8 mm; and a wall thickness B6 of the air conduction coil (320) is 0.08 to 0.3 mm.

2. The sound unit according to claim 1, wherein The ratio of the height H7 to the wall thickness B6 is 5-15.

3. The sound unit according to claim 1, wherein: The radial winding layers of the air conduction coil (320) do not exceed 6 layers.

4. The sound unit according to claim 3, wherein: The number of radial winding layers of the air conduction coil (320) is 2 to 6.

5. The sound unit according to claim 3, wherein: The radial winding layers of the air conduction coil (320) are an even number.

6. The sound unit according to claim 3, wherein: The number of turns of the layer close to the inner side of the air conduction coil (320) is greater than or equal to the number of turns of the layer close to the outer side.

7. The sound unit according to claim 1, wherein: The wire diameter of the air conduction coil (320) is less than or equal to 0.06 mm.

8. The sound unit according to claim 7, wherein: The wire diameter of the air conduction coil (320) is greater than or equal to 0.035 mm.

9. The sound unit according to claim 1, wherein: The number of turns of the air conduction coil (320) is 30 to 120.

10. The sound unit according to claim 1, wherein: The distance D12 by which the end of the air conduction coil (320) close to the magnetic base plate (3100) extends beyond the main pole core plate (313) is greater than the maximum amplitude of the diaphragm (321) when the air conduction sound generating device (3) is in operation.

11. The sound unit according to claim 1, wherein: The diaphragm (321) comprises an outer ring piece (3210) connected to the air conduction support (30), an intermediate piece (3211) located inside the outer ring piece (3210), and a folding ring portion (3212) located between the outer ring piece (3210) and the intermediate piece (3211), wherein the folding ring portion (3212) seals the area between the outer ring piece (3210) and the intermediate piece (3211), a distance L6 from the intermediate piece (3211) to the main pole core plate (313) is 0.4 to 0.8 mm, a distance L7 from the air conduction coil (320) to the magnetic conductive bottom plate (3100) is 0.4 to 0.8 mm, and both the distance L6 and the distance L7 are greater than the maximum amplitude of the diaphragm assembly (32) when the air conduction sound generating device (3) is working.

12. The sound unit according to claim 11, wherein: The difference between the distance L6 and the distance L7 and the maximum amplitude of the diaphragm (321) is 0.1 to 0.3 mm.

13. The sound generating unit according to any one of claims 1 to 12, 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 conduction magnetic circuit assembly (21) is provided in the bone conduction support (20), comprising at least one magnet (210) and at least two magnetic conductive plates (211), wherein the magnet (210) is connected between two adjacent magnetic conductive plates (211), the magnetic poles of the magnet (210) are arranged along the vibration direction A of the bone conduction sound generating device (2), and when the number of the magnets (210) is greater than or equal to two, two adjacent magnets (210) are arranged with the same poles facing each other; A bone conduction coil (22) is disposed in the bone conduction support (20) and fixed relative to the bone conduction support (20); at least one of the magnetic conductive plates (211) is surrounded by the bone conduction coil (22); both ends of the bone conduction coil (22) along the vibration direction A of the bone conduction sound generating device (2) extend beyond both ends of the magnetic conductive plate (211) along the vibration direction A; a height H4 of the bone conduction coil (22) is 1.5 to 2.5 mm; and a wall thickness B3 of the bone conduction coil (22) is 0.35 to 0.6 mm; and The spring piece (23) is connected between the bone conduction magnetic circuit component (21) and the bone conduction bracket (20).

14. The sound unit according to claim 13, wherein: 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.

15. The sound generating unit according to claim 13, wherein: The number of radial winding layers of the bone conduction coil (22) is greater than or equal to two.

16. The sound unit according to claim 15, wherein: The number of radial winding layers of the bone conduction coil (22) is an even number, and the number of winding layers of the bone conduction coil (22) is 2 to 6.

17. The sound generating unit according to claim 15, wherein: 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.

18. The sound generating unit according to claim 15, wherein: The wire diameter of the bone conduction coil (22) is greater than or equal to 0.1 mm.

19. The sound unit according to claim 18, wherein: The wire diameter of the bone conduction coil (22) is less than or equal to 0.15 mm.

20. The sound generating unit according to claim 13, wherein: The distance that the bone conduction coil (22) extends beyond the inner end surface (2115) of the magnetic conductive plate (211) is greater than the distance that the bone conduction coil (22) extends beyond the outer end surface (2116) of the magnetic conductive plate (211); The difference in distance between the two ends of the bone conduction coil (22) and the two end surfaces of the magnetic conductive plate (211) is 0.1 to 0.3 mm.

21. The sound generating unit according to claim 13, wherein: The bone magnetic circuit assembly (21) comprises two magnetic conductive plates (211) and a magnet (210) located between the two magnetic conductive plates (211); The bone conduction sound generating device (2) comprises two bone conduction coils (22), the two bone conduction coils (22) respectively surrounding the outside of the two magnetic conductive plates (211), and the leads of the bone conduction coils (22) are located at the ends of the bone conduction coils (22) away from the magnet (210); The bone conduction bracket (20) comprises two wire outlet holes (201) respectively connected to the two end surfaces thereof, and the leads of the two bone conduction coils (22) respectively pass through the two wire outlet holes (201). The bone conduction sound generating device (2) comprises two spring pieces (23), and the two spring pieces (23) are respectively connected to the two end surfaces of the bone conduction bracket (20).

22. The sound unit according to claim 21, wherein: The total area of all the wire outlet holes (201) accounts for 0.5% to 10% of the area of the entire outer peripheral surface of the bone conduction support (20).

23. The sound generating unit according to claim 22, wherein: The bone conduction support (20) is made of magnetic conductive material, and the total area of all the outlet holes (201) accounts for 1% to 2% of the area of the entire outer peripheral surface of the bone conduction support (20).

24. A head-mounted sound device, characterized in that: The device comprises a sound-emitting unit according to any one of claims 1 to 23.

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