Sound production unit and head-mounted sound production equipment

Abstract

The invention discloses a sound production unit and head-mounted sound production equipment, and relates to the technical field of sound production devices, the sound production unit is in contact with human face skin when worn, and the sound production unit comprises a bone conduction sound production device and an air conduction sound production device which are independently arranged; the bone conduction sound production device and the air conduction sound production device can be independently controlled to produce sound, and the minimum value of the difference value between the working frequency band of the bone conduction sound production device and the low-frequency resonance point of the bone conduction sound production device is larger than or equal to 20 Hz. The sound production unit can utilize respective sound production characteristics of the bone conduction sound production device and the air conduction sound production device, so that the sound listening effect is improved, relatively strong vibration generated by vibration near a low-frequency resonance point of the bone conduction sound production device is reduced, and the use experience is improved.

Description

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

[0002] The present application relates to the technical field of sound production devices, and in particular to a sound production unit and a head-mounted sound production device. BACKGROUND

[0003] Head-mounted sound production devices, such as earphones and smart glasses, all include sound production devices capable of producing sound. According to the sound transmission mode, the sound production devices can be divided into bone conduction sound production devices and air conduction sound production devices.

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

[0005] The air conduction sound production device generally includes a diaphragm, a coil connected with the diaphragm, and a magnetic circuit assembly for providing a magnetic field. After the coil is energized, the diaphragm is driven to vibrate under the interaction of the magnetic force of the magnetic circuit assembly, thereby stimulating the air to produce sound.

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

[0007] For example, in traditional earphones, only bone conduction sound production devices or air conduction sound production devices are usually provided, and only bone conduction sound production or air conduction sound production can be achieved, so the sound production mode is relatively single. The single bone conduction sound production and air conduction sound production cannot effectively meet the further needs of users for sound production effect.

[0008] In summary, there is still room for improvement in the sound production quality (or listening effect, sound production effect), wearing comfort, use reliability, and privacy (leakage prevention) of head-mounted sound production devices.

[0009] The above content is only used to help understand the technical solutions of the present application and does not constitute an acknowledgement of the above as prior art. SUMMARY

[0010] The purpose of the present application is to provide a sound production unit and a head-mounted sound production device to improve the sound production effect.

[0011] To achieve the above-mentioned purpose of the present application, in one aspect, the present application provides a sound production unit, which is in contact with the human facial skin when worn, and the sound production unit comprises a bone conduction sound production device and an air conduction sound production device arranged independently.

[0012] The bone conduction sound generating device and the air conduction sound generating device can be independently controlled to generate sound, and a minimum value of a difference between a working frequency band of the bone conduction sound generating device and a low-frequency resonance point of the bone conduction sound generating device is greater than or equal to 20 Hz.

[0013] In another aspect, the present application provides a head-mounted sound generating device, which comprises the sound generating unit as described above.

[0014] Compared with the prior art, the present application has the following beneficial effects: according to at least one embodiment of the present application, the sound generating unit comprises independently arranged bone conduction sound generating device and air conduction sound generating device, and the bone conduction sound generating device and the air conduction sound generating device can be independently controlled to generate sound, the bone conduction sound generating device and the air conduction sound generating device can be selectively used to generate sound, and the sound generating characteristics of the bone conduction sound generating device and the air conduction sound generating device can be used, thereby improving the sound listening effect. Further, a minimum value of a difference between a working frequency band of the bone conduction sound generating device and a low-frequency resonance point of the bone conduction sound generating device is greater than or equal to 20 Hz, which can reduce the strong vibration sensation generated by vibration near the low-frequency resonance point of the bone conduction sound generating device, and better use experience can be obtained. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic diagram of a head-mounted sound generating device in some embodiments of the present application.

[0016] Figure 2 is a sectional view schematic diagram of a sound generating unit in some embodiments of the present application, in which the shell is integrated.

[0017] Figure 3 is a sectional view schematic diagram of a sound generating unit in some embodiments of the present application, in which the shell is split.

[0018] Figure 4 is a structural schematic diagram of a sound generating unit in some embodiments of the present application.

[0019] Figure 5 is Figure 4 is an exploded view of the sound generating unit shown.

[0020] Figure 6a is Figure 4 is a sectional view schematic diagram of the sound generating unit shown.

[0021] Figure 6b is a structural schematic diagram of a sound generating unit in some embodiments of the present application.

[0022] Figure 6c is a structural schematic diagram of a sound generating unit in some embodiments of the present application, in which the structure of the bone conduction magnetic circuit assembly is consistent with that in Figure 15a .

[0023] Figure 6d is the frequency response curve of the sound production unit with different total area sizes of the through hole in some embodiments of the present application.

[0024] Figure 7a is the module block diagram of the sound production unit in some embodiments of the present application.

[0025] Figure 7b is the module block diagram of the sound production unit in some embodiments of the present application.

[0026] Figure 8 is the frequency response curve of the bone conduction sound production device with different low frequency F0 in some embodiments of the present application.

[0027] Figure 9 is the cross-sectional view of the sound production unit in some embodiments of the present application.

[0028] Figure 10 is the frequency response curve of the sound production unit with different volumes of the front cavity in some embodiments of the present application.

[0029] Figure 11a is the structural schematic diagram of the bone conduction sound production device in some embodiments of the present application.

[0030] Figure 11b is the cross-sectional view of the bone conduction sound production device shown in Figure 11a

[0031] Figure 12 is the cross-sectional view of the bone conduction sound production device in some embodiments of the present application, wherein the structure of the bone conduction magnetic circuit assembly is consistent with that shown in Figure 15a

[0032] Figure 13 is the structural schematic diagram of the bone conduction sound production device in some embodiments of the present application, wherein the bone conduction support is in the shape of a racetrack.

[0033] Figure 14a is the structural schematic diagram of the bone conduction magnetic circuit assembly in some embodiments of the present application.

[0034] Figure 14b is the schematic diagram of the bone conduction magnetic circuit assembly shown in Figure 14a

[0035] Figure 15a is the structural schematic diagram of the bone conduction magnetic circuit assembly in some embodiments of the present application.

[0036] Figure 15b is the schematic diagram of the bone conduction magnetic circuit assembly shown in Figure 15a

[0037] Figure 16a ​​​​is a structural schematic diagram of a bone conduction magnetic circuit assembly of some embodiments of the present application.

[0038] Figure 16b is Figure 16a is a schematic diagram of the bone conduction magnetic circuit assembly as a one-piece part.

[0039] Figure 17a is a structural schematic diagram of a bone conduction magnetic circuit assembly of some embodiments of the present application.

[0040] Figure 17b is Figure 17a is a schematic diagram of the bone conduction magnetic circuit assembly as a one-piece part.

[0041] Figure 18 is a structural schematic diagram of a spring of some embodiments of the present application.

[0042] Figure 19 is a graph of the relationship between the low frequency F0 of a bone conduction sound production device and the mass of the vibrator and the spring stiffness coefficient in some embodiments of the present application.

[0043] Figure 20a is a sectional view of a bone conduction sound production device of some embodiments of the present application.

[0044] Figure 20b is a sectional view of a bone conduction sound production device of some embodiments of the present application, the structure of the bone conduction magnetic circuit assembly in the figure being consistent with that in Figure 15a .

[0045] Figure 21 is a structural schematic diagram of an air conduction sound production device of some embodiments of the present application.

[0046] Figure 22 is Figure 21 is a top view of the air conduction sound production device.

[0047] Figure 23 is a sectional view taken along the M-M sectional line in Figure 22 .

[0048] Figure 24 is a top view of a magnetic conduction support of some embodiments of the present application.

[0049] Figure 25 is a top view of a magnetic conduction support of some embodiments of the present application.

[0050] Figure 26 is a top view of a magnetic conduction support of some embodiments of the present application.

[0051] Figure 27 is a structural schematic diagram of an air conduction sound production device of some embodiments of the present application.

[0052] Figure 28 Figure 27 is a sectional view of the air-conduction sound production device shown in

[0053] Figure 29 Figure 28 is an enlarged view of the III part in

[0054] Figure 30 Figure 27 is a position schematic view of the magnetic-conduction support, main magnet and main pole core plate of the air-conduction sound production device shown in

[0055] Figure 31 is a sectional view along the J-J section line in Figure 23

[0056] Figure 32 is a position schematic view of the magnetic-conduction support, secondary magnet and secondary pole core plate of some embodiments in the present application.

[0057] Figure 33 is a position schematic view of the magnetic-conduction support, secondary magnet and secondary pole core plate of some embodiments in the present application.

[0058] Figure 34 is a position schematic view of the magnetic-conduction support, secondary magnet and secondary pole core plate of some embodiments in the present application.

[0059] Figure 35 Figure 23 is a structure schematic view of the air-conduction magnetic circuit assembly of the air-conduction sound production device shown in

[0060] Figure 36 Figure 23 is an enlarged view of the II part in

[0061] Figure 37 Figure 27 is an exploded schematic view of the diaphragm assembly in

[0062] Figure 38 Figure 21 is a structure schematic view of the diaphragm assembly in DETAILED DESCRIPTION

[0063] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0064] ​​​​​​​​The terms "comprises", "comprising", "includes", "including", "has", "having" and their conjugates herein, mean "including but not limited to". As used herein, the expression "and / or" includes combinations of one or more of the associated listed items.

[0065] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a single alternative embodiment. One of ordinary skill in the art will readily recognize from the disclosure herein a wide number of ways to implement the abstractions, applications, methods and so forth described herein.

[0066] Reference herein to the area of a hole means the size of the area enclosed by the outer contour of the hole.

[0067] Reference herein to a dimension or a range of dimensions, such as "length", "width", "height", "thickness", "wall thickness", and so forth, means the dimension or range of dimensions of the part at its largest in the corresponding direction, unless otherwise specified.

[0068] Embodiments of the present specification describe a head-mounted sound emitting device, which can be worn on a human head and enable a human to hear sound, for example, through bone conduction and / or air conduction. The head-mounted sound emitting device includes a sound emitting unit 10 for emitting sound and a wearing mechanism 11 connected to the sound emitting unit 10, the wearing mechanism 11 being configured to wear the sound emitting unit 10 on the human head so that the sound can be conveniently heard by the human. For example, the sound emitting unit 10 is worn at a position corresponding to the human ear, such as directly into the ear or at a position in front of the ear.

[0069] In some embodiments, the wearing mechanism 11 can have an open ring shape (e.g., a U-shape) and be sleeved on the top of the user's head to achieve wearing. In some embodiments, the wearing mechanism 11 can include an ear hook, which has a curved shape and can be hung over the user's ear. In some embodiments, the wearing mechanism 11 can include a curved-shaped back hook and an ear hook adapted to be hooked over the human ear, and the like. The back hook is adapted to be wrapped around the back of the human head. In some embodiments, the wearing mechanism 11 can also be a glasses frame structure, which includes glasses legs on both sides of the head, and the sound emitting unit 10 can be connected to the glasses legs.

[0070] In some embodiments, the head-mounted sound production device includes one sound production unit 10, when the sound production unit 10 is worn at the left ear or the right ear of a person, for example, when the head-mounted sound production device is a single-ear earphone, it only includes one sound production unit 10, and can have an ear hook hung on the ear. In other embodiments, the head-mounted sound production device includes two sound production units 10, which are respectively worn at the left and right ears of a person, for example, the head-mounted sound production device can be a double-ear earphone or glasses, etc., at this time it includes two sound production units, according to the product, the head-mounted sound production device can also include a back hook and an ear hook or a frame structure, etc.

[0071] Hereinafter, the head-mounted sound production device is taken as a double-ear earphone as an example.

[0072] As shown in Figure 1 , the head-mounted sound production device shown in Figure 1 is a double-ear earphone, which includes two sound production units 10 (or earphone heads), and at the same time it includes a back hook 110 suitable for being wrapped around the back of the head, two ear hooks 111 suitable for being hung on the ears, and two functional compartments for accommodating control circuit boards and / or batteries, for example, the two functional compartments are a control compartment 112 for accommodating a control circuit board and a battery compartment 113 for accommodating a battery, and again, each functional compartment accommodates a control circuit board and / or a battery. The back hook 110 is connected between the two functional compartments, the two sound production units 10 are respectively and correspondingly arranged with the two functional compartments, the sound production unit 10 and the corresponding functional compartment are connected through the ear hook 111, specifically, the back hook 110 is connected between the control compartment 112 and the battery compartment 113, and the control compartment 112 and one of the sound production units 10 are connected through an ear hook 111, and the battery compartment 113 and the other sound production unit 10 are connected through an ear hook 111. It can be understood that the back hook 110, the ear hook 111 and the two functional compartments jointly constitute a wearing mechanism 11 of the earphone.

[0073] It can be understood that although the present specification takes the double-ear earphone as an example for introduction, the head-mounted sound production device is not limited to be a double-ear earphone, for example, it can also be a hearing aid, audio glasses, a smart helmet, a VR device, an AR device, etc. electronic device.

[0074] The head-mounted sound production device as a whole is symmetrical to improve the comfort of wearing.

[0075] Next, the sound production unit of the head-mounted sound production device is illustrated.

[0076] The sound production unit 10 includes a shell assembly 100 and a sound production device arranged inside the shell assembly 100, and optionally, the shell assembly 100 is connected by at least two shells, in some embodiments, as shown in Figure 2As shown, the housing assembly 100 comprises a housing 1000 with one open end and a face cover 1001 closing the open end of the housing 1000, the housing 1000 is integrally formed, the face cover 1001 is in contact with the skin of the face when worn, optionally, a soft layer (not shown) is provided on the outer side 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 can be understood that the surface of the face cover 1001 used to contact the skin of the face is the contact surface 10010. In other embodiments, as shown in Figure 3 As shown, the housing 1000 is connected by two parts, which comprises a side shell part 1004 and a back cover 1002, the face cover 1001 and the back cover 1002 are oppositely arranged, and both of them close the two open ends of the side shell part 1004, optionally, the side shell part 1004 is in the shape of a tube. The side shell part 1004 is not limited to be a single part, for example, it can be connected into a tube shape by two or more parts. It can be understood that when the housing 1000 is integrally formed, the back cover 1002 and the side shell part 1004 are integral. The housing 1000 is not limited to be provided with only one opening, in other embodiments, the housing 1000 can also be provided with two or more openings, for example, the side shell part 1004 can be provided with notches and closed by a cover or other components.

[0077] The sound generating unit 10 is connected with the ear hook 111 through the housing assembly 100, for example, the ear hook 111 can be connected with the side shell part 1004.

[0078] The sound generating device is used to convert electrical signals into mechanical vibrations, for example, it can be a bone conduction sound generating device, which converts electrical signals into mechanical vibrations and directly transmits the mechanical vibrations to the human skin through the face cover 1001 in contact with the skin of the face to make the person hear the sound through bone conduction. The sound generating device can also be an air conduction sound generating device, at this time, it stimulates air vibration through mechanical vibration, thereby forming air conduction sound. It can be understood that the housing assembly 100 is not limited to be provided with only one or one kind of sound generating device.

[0079] In some embodiments, as shown in Figure 2 and Figure 3 As shown, the sound generating unit 10 can simultaneously conduct sound through bone conduction and air conduction, at this time, it is simultaneously provided with a bone conduction sound generating device 2 and an air conduction sound generating device 3, optionally, the bone conduction sound generating device 2 is connected with the face cover 1001 and / or the back cover 1002.

[0080] It can be understood that when the sound generating unit 10 has independently arranged bone conduction sound generating device 2 and air conduction sound generating device 3, the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be selectively used to generate sound, increasing the diversity of sound generating methods, and the respective sound generating characteristics of the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be used to fully exert the performance advantages of the combination of bone conduction and air conduction, and avoid the disadvantages, such as filtering out the frequency band with the maximum vibration of the bone conduction vibration part to reduce the tingling sensation, and using the bass of the low frequency part of the air conduction to improve the sensitivity of the low frequency, etc. Of course, the above examples are only one aspect, and those skilled in the art can fully utilize the combination method to diversify the sound quality and improve the disadvantages of the independent use of a single sound generating unit, thereby improving the listening effect. In the following, the sound generating unit with both sound generating devices is taken as an example for introduction. It can be understood that the bone conduction sound generating device 2 and the air conduction sound generating device 3 described below can also be independently applied to the sound generating unit 10.

[0081] Figure 4 to Figure 6a Fig. 1 is a structural schematic diagram of a sound generating unit 10 according to some embodiments of the present disclosure, which includes a shell assembly 100 and a bone conduction sound generating device 2 and an air conduction sound generating device 3 arranged in the shell assembly 100. The bone conduction sound generating device 2 is connected with the face cover 1001, and the vibration is transmitted to the human body through the face cover 1001. The air conduction sound generating device 3 is arranged on one side of the bone conduction sound generating device 2. In other embodiments, the bone conduction sound generating device 2 can also be connected with the back cover 1002 or simultaneously connected with the face cover 1001 and the back cover 1002, and the vibration is transmitted to the face cover 1001 through the shell 1000, and then transmitted to the human body through the face cover 1001. The shell assembly 100 is provided with a sound outlet hole 1003 for communication between the inside and outside, and the air conduction sound generating device 3 generates sound outward through the sound outlet hole 1003, which has a diaphragm 321 for vibration sound generation. Optionally, the diaphragm 321 is arranged opposite to the sound outlet hole 1003. Since the bone conduction sound generating device 2 and the air conduction sound generating device 3 are arranged simultaneously, bone conduction sound transmission and air conduction sound transmission can be realized simultaneously, the volume is increased, and the respective advantage frequency bands can be used to achieve better hearing effect.

[0082] In some embodiments, the air conduction sound generating device 3 is located on one side of the bone conduction sound generating device 2 in the width direction, and the air conduction sound generating device 3 and the bone conduction sound generating device 2 are arranged along the width direction Y of the sound generating unit 10, so that the arrangement of the air conduction sound generating device 3 and the bone conduction sound generating device 2 is more reasonable, the structure is more compact, the space is saved, and the weight distribution is optimized, which is beneficial to control the mass and volume of the sound generating unit 10 within a smaller range. The sound generating unit 10 can have a suitable shape and volume, and will not be too long to cause discomfort when worn, and is beneficial to the air conduction sound generating device 3 to generate sound close to the ear. The length direction X, the width direction Y and the thickness (or height) direction Z of the sound generating unit 10 can refer to the length direction X, the width direction Y and the thickness direction Z of the sound generating unit 10 shown in Fig. 1. Figure 4The length, width and thickness directions of the shell assembly 100 are consistent with the length, width and thickness directions of the sound production unit 10.

[0083] The air conduction sound production device 3 and the bone conduction sound production device 2 are long strips, and the length is greater than the width. For example, the cross section of the air conduction sound production device 3 and the bone conduction sound production device 2 is rectangular (the corners can be rounded, right-angled, inverted bevel or other transition connection shape of long side and short side, such as curve, etc.), or track-shaped, etc. It can be understood that the cross section of the air conduction sound production device 3 and the bone conduction sound production device 2 is rectangular or track-shaped, which does not mean that the outer contour must be strictly rectangular or track-shaped, and it can also be approximately rectangular or track-shaped. Optionally, the bone conduction sound production device 2 is arranged along the length direction of the sound production unit 10 (for example, the length direction of the bone conduction sound production device 2 can be consistent with the projection of the length direction of the sound production unit 10 on the XY plane, or the two form an angle of not more than 30°), so as to increase the volume of the bone conduction sound production device 2, increase the sound pressure level and reduce the distortion, and improve the sound production effect. Further optionally, the bone conduction sound production device 2 is consistent with the length direction of the sound production unit 10. Further optionally, the shell assembly 100 has a substantially rectangular cavity, so that the volume is smaller and the space utilization is higher under the premise of achieving the desired performance. Still further optionally, the bone conduction sound production device 2 and the air conduction sound production device 3 are in the shape of a cuboid, and the cross section is substantially rectangular, so as to more fully utilize the space inside the shell assembly 100, make the structure of the entire sound production unit 10 more compact, and try to reduce the volume of the sound production unit 10 under the premise of meeting the performance, so that the overall appearance and volume of the earphone head meet the ergonomics, and the bone conduction sound production device 2 and the air conduction sound production device 3 are conveniently installed in the earphone head.

[0084] Optionally, the air conduction sound production device 3 is arranged along the length direction of the sound production unit 10 (for example, the length direction of the air conduction sound production device 3 can be consistent with the projection of the length direction of the sound production unit 10 on the XY plane, or the two form an angle of not more than 30°), which is conducive to fully utilizing the space in the length direction of the air conduction sound production device 3 and increasing the effective radiation area of the diaphragm 321. In this specification, the bone conduction sound production device 2 and the air conduction sound production device 3 are taken as examples of a cuboid to be introduced, unless otherwise specified. It can be understood that the bone conduction sound production device 2 and the air conduction sound production device 3 are taken as examples of a cuboid, which does not mean that the bone conduction sound production device 2 and the air conduction sound production device 3 must be in the shape of a cuboid, and the cross section can also be in the shape of a track, a cylinder, an ellipse or a polygon, etc.

[0085] Next, the sound production methods of the bone conduction sound production device 2 and the air conduction sound production device 3 are exemplified.

[0086] Since the bone conduction sound generating device 2 and the air conduction sound generating device 3 are arranged simultaneously, the acoustic characteristics of both can be fully utilized, and the advantages of each can be combined to achieve a more optimal sound generating effect. Moreover, compared with pure bone conduction sound generation and air conduction sound generation, the sound generating manner can also be more diversified.

[0087] In some embodiments, the bone conduction sound generating device 2 and the air conduction sound generating device 3 work simultaneously in the entire sound generating frequency band. In this way, the control circuit of the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be simplified, and the electronic components can be reduced, for example, an additional frequency divider circuit is not needed, which can reduce the complexity and cost of design and manufacturing. In addition, the whole frequency band sound generating manner can increase the overall loudness, provide a more natural frequency band transition, and avoid the phase difference and discontinuity of frequency response caused by frequency division. It should be noted that the sound generating device working in a certain frequency band means that it can normally generate sound in that frequency band, and the gain attenuation is small (for example, within 10 dB) or not attenuated. The sound generating device not working in a certain frequency band means that it does not generate sound or the sound volume is greatly attenuated (for example, more than 18 dB) in that frequency band. It can be understood that in this embodiment, the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be connected to the same circuit, as shown in FIG. 11. Figure 7a Figure 7a A module block diagram of a head-mounted sound generating device in an embodiment is shown. The head-mounted sound generating device includes a control chip 1120 and a first power amplifier 1121 (power amplifier is an abbreviation of power amplifier), the first power amplifier 1121 is electrically connected between the control chip 1120 and the bone conduction sound generating device 2 and the air conduction sound generating device 3, and can amplify the signal of the control chip 1120 to drive the bone conduction sound generating device 2 and the air conduction sound generating device 3 to work. In this embodiment, the bone conduction sound generating device 2 and the air conduction sound generating device 3 can only be controlled to generate sound simultaneously.

[0088] In some embodiments, the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be independently controlled to work, so that in a certain frequency band, the bone conduction sound generating device 2 or the air conduction sound generating device 3 can be selectively used to generate sound, or both can generate sound simultaneously. For example, in a certain frequency band, the bone conduction sound generating device 2 can generate sound, and the air conduction sound generating device 3 can not generate sound, or the bone conduction sound generating device 2 can not generate sound, and the air conduction sound generating device 3 can generate sound, or the bone conduction sound generating device 2 and the air conduction sound generating device 3 can generate sound simultaneously. In this way, the respective advantages of the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be fully utilized to improve the overall sound quality of the sound generating unit 10. Moreover, since different signals can be input into the bone conduction sound generating device 2 and the air conduction sound generating device 3, the bone conduction sound generating device 2 and the air conduction sound generating device 3 can also emit different sounds, and the sound generating effect is more diversified.

[0089] ​In the present application, the standards for distinguishing the frequency bands are as follows: the low frequency band is 20-250 Hz, the low-middle frequency band is 250-500 Hz, the middle frequency band is 500-2000 Hz, the middle-high frequency band is 2000-5000 Hz, and the high frequency band is 5000-20000 Hz.

[0090] The frequency response curves of the bone conduction sound generating device 2 and the air conduction sound generating device 3 both have a low frequency resonance point (F0), which can be referred to as a low frequency resonance frequency or a low frequency F0 or F0. At the low frequency resonance point, the frequency response curve has a resonance peak.

[0091] In some embodiments, the bone conduction sound generating device 2 and the air conduction sound generating device 3 have respective working frequency bands, and at least part of the working frequency bands of the two are different. It can be understood that the air conduction sound generating device 3 works at least in the frequency band in which the bone conduction sound generating device 2 does not work, so that full-band sound generation is achieved through the cooperation of the two sound generating devices.

[0092] In some embodiments, the working frequency bands of the bone conduction sound generating device 2 and the air conduction sound generating device 3 are independent and have no intersection, and the working frequency bands of the two have a frequency division point. The air conduction sound generating device 3 works in a frequency band below the frequency division point, and the bone conduction sound generating device 2 works in a frequency band above the frequency division point, i.e., the working frequency band of the air conduction sound generating device 3 is below the frequency division point, and the working frequency band of the bone conduction sound generating device 2 is above the frequency division point. In a frequency band below 150 Hz, the bone conduction sound generating device 2 generates relatively strong vibration sensation. In order to reduce the discomfort caused by the strong vibration sensation, the frequency division point can be located at 150-400 Hz, i.e., the frequency division point can be selected as a frequency in the range of 150-400 Hz; for example, the frequency division point can be located at 170-300 Hz to further improve the comfort of use; for example, the frequency division point can be any value in 170 Hz, 180 Hz, 190 Hz, 200 Hz, 220 Hz, 250 Hz, and 300 Hz. Further, the frequency of the frequency division point is greater than the low frequency F0 of the bone conduction sound generating device 2. Strong vibration sensation is generated near the low frequency F0 of the bone conduction sound generating device 2, which is reflected in the user end as excessive tingling sensation, affecting the comfort of use of the user, because some users may not be able to tolerate such tingling sensation. By setting the frequency division point after the low frequency F0, the air conduction sound generating device 3 can mainly generate sound in a low frequency band below the frequency division point, and the bone conduction sound generating device 2 does not generate sound or reduces the sound energy near the low frequency F0. This can not only ensure the sensitivity and sound quality of the low frequency (this part is mainly contributed by the air conduction sound generating device 3), but also effectively improve the tingling sensation of the bone conduction sound generating device 2 (because the frequency band near F0 with the largest vibration amplitude is avoided), while improving the sound restoration degree, significantly improving the sound quality, and further improving the comfort of use of the user. Optionally, the difference between the two is not less than 20 Hz, so as to preferably reduce the vibration sensation of the low frequency F0.

[0093] In some embodiments, the working frequency band of the bone conduction sound generating device 2 and the air conduction sound generating device 3 has an intersection, and the working frequency band of the bone conduction sound generating device 2 is greater than the working frequency band of the air conduction sound generating device 3 as a whole. It can be understood that, in the non-overlapping working frequency band of the bone conduction sound generating device 2 and the air conduction sound generating device 3, the working frequency band of the bone conduction sound generating device 2 is greater than the working frequency band of the air conduction sound generating device 3. For example, the working frequency band of the bone conduction sound generating device 2 is greater than or equal to 300 Hz, and the working frequency band of the air conduction sound generating device 3 is less than or equal to 400 Hz. For another example, the working frequency band of the bone conduction sound generating device 2 is greater than or equal to 500 Hz, and the working frequency band of the air conduction sound generating device 3 is less than or equal to 800 Hz. For yet another example, the working frequency band of the bone conduction sound generating device 2 is greater than or equal to 800 Hz, and the working frequency band of the air conduction sound generating device 3 is less than or equal to 1000 Hz. Since the two have overlapping frequency bands, when the two switches work, the transition is more natural. Optionally, the range of the overlapping frequency band of the working frequency band of the bone conduction sound generating device 2 and the working frequency band of the air conduction sound generating device 2 is greater than or equal to 100 Hz, so as to ensure the naturalness of the transition. Further optionally, the working frequency band of the bone conduction sound generating device 2 is greater than the low frequency F0, and the minimum value of the difference between the working frequency band and the low frequency F0 is greater than or equal to 20 Hz, that is, the frequency band range of the working frequency band from the low frequency F0 is greater than or equal to 20 Hz.

[0094] In some embodiments, the air conduction sound generating device 3 generates sound in the full frequency band of 20 Hz-20 kHz, the working frequency band of the bone conduction sound generating device 2 is greater than the low frequency F0, and the minimum value of the difference between the working frequency band and the low frequency F0 is greater than or equal to 20 Hz, so as to reduce the vibration sensation generated near the low frequency F0 of the bone conduction sound generating device 2 and improve the comfort of use. In the frequency band in which the air conduction sound generating device 3 and the bone conduction sound generating device 2 generate sound simultaneously, the loudness can be improved; and the two sound generating devices generate sound simultaneously, so that the sound has a stereoscopic effect and the listening experience is improved.

[0095] The bone conduction sound generating device 2 and the air conduction sound generating device 3 are respectively independently connected to the circuit, so that the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be independently controlled to generate sound. Figure 7b As shown in the figure, Figure 7b A module block diagram of a head-mounted sound generating device is shown. The head-mounted sound generating device includes a control chip 1120, a first power amplifier 1121 and a second power amplifier 1122 (the power amplifier is an abbreviation of power amplifier), the first power amplifier 1121 is electrically connected between the control chip 1120 and the bone conduction sound generating device 2, can amplify the signal of the control chip 1120 to drive the bone conduction sound generating device 2 to work, and the second power amplifier 1122 is electrically connected between the control chip 1120 and the air conduction sound generating device 3, can amplify the signal of the control chip 1120 to drive the air conduction sound generating device 3 to work. By setting two power amplifiers to amplify the driving signals of the bone conduction sound generating device 2 and the air conduction sound generating device 3 respectively, the amplitudes of the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be independently adjusted, so as to improve the sound quality.

[0096] The frequency division control of the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be realized by low-pass filters and high-pass filters, that is, the frequency divider circuit includes high-pass filters and low-pass filters, and the driving signals of the corresponding frequency bands are sent to the bone conduction sound generating device 2 and the air conduction sound generating device 3 through the high-pass filters and the low-pass filters for sound generation.

[0097] In some embodiments, the EQ (equalizer) of the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be independently adjusted, so that the sound effects of the two can be independently controlled, thereby adjusting the sound effects of the two respectively and improving the sound quality. The control chip 1120 is built-in with an EQ adjustment module, and the sound effect of the sound generating device can be adjusted through the EQ adjustment module.

[0098] For example, for the bone conduction sound generating device 2, the gain of the 20Hz-100Hz frequency band can be increased by the EQ adjustment module to compensate for the weakness of the bone conduction sound generating device 2 in the low frequency band, to enhance the low frequency response, so that the sound is more full, and the gain increase size can be 2dB-6dB, for example. At the same time, the gain near F0 is reduced to reduce the vibration and numbness, and the F0 nearby can be in the range of F0±30Hz, and optionally, the reduced gain size is at least 3dB-6dB, and further optionally at least 10dB (i.e. 10dB smaller than the normal sound pressure level), to effectively reduce the numbness, and at the same time reduce the amplitude near F0 to avoid collision noise, when the frequency range near F0 overlaps with 20Hz-100Hz, only the gain near F0 is reduced. The gain of the 250Hz-2kHz frequency band is fine-tuned, and the advantage of the bone conduction sound generating device 2 in the middle frequency band is utilized to maintain balance and clarity. The gain of the frequency band above 2kHz is appropriately increased, for example, the gain is increased by 2dB-8dB, to compensate for the weakness of the bone conduction sound generating device in the high frequency band, so that the sound is clearer and brighter.

[0099] For example, for the air conduction sound generating device 3, the gain of the 20Hz-100Hz frequency band can be increased by the EQ adjustment module, for example, by 2dB-4dB, so as to balance the low frequency effect of the bone conduction sound generating device 2 by utilizing the good performance of the air conduction sound generating device 3 in the low frequency band. The air conduction sound generating device 3 usually performs well in the middle frequency band, and the gain of the 150Hz-4kHz frequency band can be fine-tuned according to the actual situation to maintain the clarity and naturalness of the human voice and musical instruments. The air conduction sound generating device 3 usually performs well in the high frequency band, and the gain of the frequency band above 4kHz can be appropriately reduced, for example, by 2dB-6dB, to avoid the sound being too harsh.

[0100] It can be understood that when the bone conduction sound generating device 2 and the air conduction sound generating device 3 work in the corresponding frequency band, the sound effect thereof can be adjusted in the above manner. When the bone conduction sound generating device 2 and the air conduction sound generating device 3 do not work in the corresponding frequency band, the EQ adjustment can not be performed on the frequency band, or even if the EQ adjustment is performed on the frequency band, the expected adjustment effect on the sound generating device cannot be achieved due to the filtering of the driving signal. In some embodiments, the gain of a certain frequency band can also be reduced through the EQ adjustment, so that the bone conduction sound generating device 2 and the air conduction sound generating device 3 do not work in the corresponding frequency band.

[0101] In some embodiments, the low frequency F0 of the bone conduction sound generating device 2 is 100Hz-300Hz, which can produce a better low frequency effect. If the F0 is too low, the vibration amplitude of the bone conduction magnetic circuit assembly 21 will be too large, which will produce noise and a large tingling sensation, making people uncomfortable. If the F0 is too high, the good low frequency playback effect cannot be achieved. Figure 8 , Figure 8 The frequency response curve of the bone conduction sound generating device 2 with different low frequencies F0 in some embodiments of the present application is shown. As can be seen from the figure, when the low frequency F0 is 100Hz-300Hz, the peak value corresponding to the low frequency F0 is small, and the loudness is appropriate. Further, the low frequency F0 of the bone conduction sound generating device 2 is 160Hz-240Hz, so that the loudness at the low frequency F0 is more appropriate.

[0102] In some embodiments, the low frequency resonance point (F0) of the air conduction sound generating device 3 in the free space (i.e. when the back cavity is infinite) is 50Hz-280Hz, which can have a better bass performance without causing the vibration amplitude of the diaphragm 321 to be too large to produce noise, and can ensure that the air conduction sound generating device 3 can effectively transmit and highlight the basic frequency component of the voice, thereby improving the clarity and distinguishability of the voice. In addition, the frequency response of the low frequency band of the air conduction sound generating device 3 can be increased to compensate for the weakness of the low frequency band of the bone conduction sound generating device 2 and improve the sound generating effect of the low frequency band.

[0103] In some embodiments, the ratio of the low-frequency resonance point of the bone conduction sound generating device 2 to the low-frequency resonance point of the air conduction sound generating device 3 is 1-4. A small difference between the low-frequency resonance points of the bone conduction sound generating device 2 and the air conduction sound generating device 3 means that the bone conduction sound generating device 2 and the air conduction sound generating device 3 can reach peak response in a similar frequency range, which can maintain the phase consistency of the audio signal. If the resonance frequency difference is too large, the sound signals of different frequency bands can have a phase difference, resulting in chaotic and uncoordinated sound, thereby affecting the auditory experience. A similar resonance frequency means that the transition is more natural when sound is converted between bone conduction and air conduction, and the difference is not easily perceived in hearing, thereby facilitating the balance of bone conduction sound and air conduction sound, and improving sound quality. Further, the ratio of the low-frequency resonance point of the bone conduction sound generating device 2 to the low-frequency resonance point of the air conduction sound generating device 3 can be selected to be 1.1-2.5 to further ensure the effect.

[0104] Alternatively, the low frequency F0 of the air conduction sound generating device 3 is smaller than the low frequency F0 of the bone conduction sound generating device 2. Although the vibration sensation can be reduced when the bone conduction sound generating device 2 does not work near its low frequency F0 or the low frequency F0 of the bone conduction sound generating device 2 is attenuated, the listening experience is easily deteriorated. At this time, by setting the low frequency F0 of the air conduction sound generating device 3 to be smaller than the low frequency F0 of the bone conduction sound generating device 2, the low frequency effect can be improved, and thus the overall sound generating effect can be improved.

[0105] In some embodiments, the ratio of the low-frequency resonance amplitude of the bone conduction sound generating device 2 to the low-frequency resonance amplitude of the air conduction sound generating device 3 is 0.5-2, where the low-frequency resonance amplitude refers to the amplitude at the low frequency F0. Within this ratio range, the amplitude difference between the bone conduction sound generating device 2 and the air conduction sound generating device 3 is small, and the generated sensitivity is relatively close, which can avoid one sound being too prominent or being covered, and is also conducive to the balance of bone conduction sound and air conduction sound, thereby further improving sound quality. Further, the ratio of the low-frequency resonance amplitude of the bone conduction sound generating device 2 to the low-frequency resonance amplitude of the air conduction sound generating device 3 can be selected to be 0.7-1.3 to further ensure the effect, and the sound emitted by the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be better fused together to provide a more natural and balanced sound quality. This helps to avoid the separation of sound, so that the user experiences more consistent and harmonious sound; in addition, the amplitude difference between the bone conduction sound generating device 2 and the air conduction sound generating device 3 is small, and the intensity of the sound is more evenly distributed in the bone conduction and air conduction paths, reducing the sound of a certain conduction method being too strong or too weak, thereby reducing auditory fatigue and improving the comfort of long-term wearing.

[0106] In some embodiments, the high frequency cutoff frequency of the air conduction sound generating device 3 is in the range of 3000 Hz to 20000 Hz, and further optionally in the range of 5000 Hz to 20000 Hz. When the earphone head uses the bone conduction sound generating device 2 to generate sound, the earphone head is in contact with the human face, and the human face skin is equivalent to a spring, and the earphone head and the human face form a resonance system, the resonance frequency of the resonance system is relatively low, generally lower than 5000 Hz, so the high frequency attenuation of the bone conduction sound is obvious, and the sensitivity of the medium and high frequency is low. By increasing the high frequency cutoff frequency of the air conduction sound generating device 3, the sensitivity of the medium and high frequency can be improved by the air conduction of the air conduction sound generating device 3, so as to improve the medium and high frequency response of the whole machine and improve the sound quality of the earphone. There are many ways to improve the high frequency cutoff frequency, for example, the front cavity 10042 of the air conduction sound generating device 3 can be made small to improve the high frequency resonance frequency of the air conduction sound generating device 3 in the earphone system; for example, the rigidity of the ball top of the diaphragm 321 can be increased, for example, a reinforcing sheet 3213 made of PET or aluminum foil and the like is attached to the middle sheet body 3211 of the diaphragm 321. Figure 29 and Figure 36 ).

[0107] In some embodiments, the total quality factor Qts value of the air conduction sound generating device 3 is in the range of 0.5 to 2, the Qts value affects the frequency response and amplitude near F0, the higher the Qts value, the higher the sensitivity near F0, but the amplitude is larger, and the Qts value is limited to 0.5 to 2, so that the sensitivity and amplitude are more balanced. The total quality factor Qts value is related to the mechanical quality factor (Qms) and the electrical quality factor (Qes), and the Qts can be adjusted by adjusting the mechanical quality factor (Qms) and the electrical quality factor (Qes). Qts increases with the increase of Qms and Qes as a whole, and decreases with the decrease of Qms and Qes. For example, the diaphragm 321 made of harder or heavier material generally reduces Qms, and the softer diaphragm improves Qms, for example, adding damping materials such as damping glue in the air conduction sound generating device 3 (for example, on the folded ring part of the diaphragm 321) can reduce Qms, for example, increasing the coil resistance can reduce Qes, and reducing the coil resistance can increase Qes, for example, increasing the magnetic field strength of the magnet (or selecting a stronger magnetic material) can generally reduce Qes. In addition, the total quality factor is also related to the structure, mass and volume of each component of the air conduction sound generating device 3, and in this specification, the total quality factor Qms can also be adjusted by limiting the structure, mass and volume of each part.

[0108] Optionally, the total quality factor Qts value of the bone conduction sound generating device 2 is 4 to 7, the higher the Qts value, the faster the bone conduction sound generating device 2 starts and stops, and the signal can be quickly responded, and has good transient performance.

[0109] In the embodiments described in the specification, the thickness direction of the bone conduction sound generating device 2 is consistent with the vibration direction A thereof, and the thickness direction of the air conduction sound generating device 3 is consistent with the vibration direction B thereof.

[0110] Next, the vibration directions of the bone conduction sound generating device 2 and the air conduction sound generating device 3 and the sound outlet are illustrated.

[0111] As shown in Figure 2 , the positive direction of the vibration direction A of the bone conduction sound generating device 2 points to the contact surface 10010 of the face cover 1001 and the human body, the positive direction of the vibration direction is the direction pointing to the outside of the shell 1000, the negative direction is the direction pointing to the inside of the shell 1000, which is opposite to the positive direction, and specifically, Figure 2 , the positive direction and the negative direction are respectively indicated by "+" and "-", the positive direction of the vibration direction A is upward, and the negative direction is downward, the positive direction of the vibration direction B is leftward, and the negative direction is rightward. Optionally, the angle a1 between the vibration direction A and the contact surface 10010 is 60°-90°, further optionally, the angle a1 between the vibration direction A and the contact surface 10010 is 75°-90°, and more further optionally, the angle a1 between the vibration direction A and the contact surface 10010 is 90°. As described above, when the contact surface 10010 is a plane, the angle a1 between a certain object (for example, the vibration direction A) and the contact surface 10010 is the angle between the object and the plane of the contact surface 10010, and when the contact surface 10010 is an arc surface, the most convex point or the most concave point of the arc surface has a tangent plane 10011, at this time, the angle a1 between a certain object and the contact surface 10010 can be understood as the angle between the vibration direction A and the tangent plane 10011. By setting the angle a1 to be greater than 60°, the component of the vibration in the direction parallel to the human face can be reduced, so that the vibration of the bone conduction sound generating device 2 is better transmitted to the skull, and the loss of vibration is reduced.

[0112] The positive direction of the vibration direction B of the air conduction sound generating device 3 points to the side shell part 1004 of the shell 1000, the vibration direction B is not parallel or coincident with the vibration direction A of the bone conduction sound generating device 2, or in other words, the vibration direction B of the air conduction sound generating device 3 and the vibration direction A of the bone conduction sound generating device 2 have an angle other than 0. In some embodiments, referring to Figure 6a and Figure 6c , the air conduction sound generating device 3 is arranged opposite to the bone conduction sound generating device 2 (the side where the diaphragm 321 of the air conduction sound generating device 3 is the front side, and the bottom surface 3b is the back side), at this time, the diaphragm 321 of the air conduction sound generating device 3 is close to the sound outlet 1003, which is beneficial to improve the sound transmission efficiency and increase the volume. In other embodiments, referring to Figure 6b , the air conduction sound generating device 3 is arranged to face the bone conduction sound generating device 2, for example, an opening can be arranged on the bottom surface 3b or other parts of the air conduction sound generating device 3, such as a ventilation hole 3c that communicates between the inside and outside of the air conduction sound generating device 3, to allow sound to be transmitted out.

[0113] It can be understood that the air conduction sound generating device 3 is arranged facing or away from the bone conduction sound generating device 2, and the thickness direction of the air conduction sound generating device 3 corresponds to the width direction of the sound generating unit 10, so that the space occupation in the width direction of the sound generating unit 10 can be reduced, and the sound generating unit 10 will not be too wide to cause discomfort when worn.

[0114] Reference Figure 2 and Figure 4 When the head-mounted sound generating device is worn, the side shell part 1004 of the housing 1000 has a proximal end 10040 close to the human ear in the width direction Y. Obviously, the proximal end 10040 of the side shell part 1004 is also the proximal end 10040 of the housing 1000, the shell assembly 100 and the sound generating unit 10. The air conduction sound generating device 3 is arranged close to the proximal end 10040 relative to the bone conduction sound generating device 2, and is arranged to sound towards the proximal end 10040 of the side shell part 1004. The sound outlet hole 1003 is opened on the proximal end 10040. In this way, the air conduction sound generating device 3 can be close to the human ear and sound towards the human ear, which helps to improve the directivity and clarity of the sound, reduces the loss and distortion of the sound, enables the human to hear more air conduction sound, has higher sound generating efficiency and better effect, and can appropriately reduce the volume of the air conduction sound generating device 3, which is beneficial to miniaturization. In addition, the bone conduction sound generating device 2 is far away from the sound outlet hole 1003, which can reduce the interference caused by the sound wave inside the bone conduction sound generating device 2 when the bone conduction sound generating device 2 vibrates. As shown in Figure 1 , the proximal end 10040 is also the end of the side shell part 1004 close to the functional compartment, and the sound outlet hole 1003 is opened on the end surface of the side shell part 1004 of the shell assembly 100 towards the functional compartment.

[0115] In some embodiments, referring to Figure 9 , the included angle α2 between the vibration direction B of the air conduction sound generating device 3 and the contact surface 10010 is 0-45°. By setting the included angle α2 between the vibration direction B and the contact surface 10010 to 0-45°, the sound emitted by the air conduction sound generating device 3 can be better directed to the ear canal, improve the propagation efficiency of the sound, and at the same time reduce the leakage of sound. Further optionally, the included angle α2 is 0-30°, and further optionally, the included angle α2 is 0-15°, so that the sound emitted by the air conduction sound generating device 3 can be more accurately directed to the ear canal. When the included angle α2 is greater than 0°, the positive direction of the vibration direction B of the air conduction sound generating device 3 points to the side where the contact surface 10010 is located or points to the plane where the contact surface 10010 is located, and extends in a direction away from the bone conduction sound generating device 2. Optionally, when the head-mounted sound generating device is worn, the positive direction of the vibration direction B points to the inside of the auricle, so as to improve the listening effect by using the sound collecting effect of the auricle, and reduce the leakage of sound.

[0116] It can be understood that the angle between the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be adjusted in various ways, Figure 9In the shown embodiment, the two are connected to the face cover 1001 and the side shell part 1004 respectively through one connecting piece 12 each, and the surface connected to the sound production device of the connecting piece 12 is inclined, so that the bone conduction sound production device 2 and the air conduction sound production device 3 are also inclined after installation. In other embodiments, the connecting piece 12 can not be provided, and inclined surfaces are provided on the face cover 1001 and the side shell part 1004, and the bone conduction sound production device 2 and the air conduction sound production device 3 are installed on the corresponding inclined surfaces respectively to adjust the angle.

[0117] In some embodiments, the included angle a3 between the axis direction C of the sound outlet hole 1003 and the contact surface 10010 is 0-45°, so that the sound range emitted thereby can be reliably transmitted to the ear, and further optionally, the included angle a3 is 0-30°, and further optionally, the included angle a3 is 0-15°, which can further increase the sound transmitted to the ear. Optionally, when the included angle a3 is greater than 0°, the positive direction of the axis direction C of the sound outlet hole 1003 points to the side where the contact surface 10010 is located, so that the sound is guided by the sound outlet hole 1003 to the ear canal, reducing the leakage caused by outward dispersion. Similarly, the positive direction of the axial direction C of the sound outlet hole 1003 refers to the direction towards the outside of the shell, and the negative direction is opposite to the positive direction. Optionally, when the head-mounted sound production device is worn, the positive direction of the axis direction C points inward of the auricle, so as to improve the sound listening effect by using the sound gathering effect of the auricle, and is beneficial to reduce the leakage.

[0118] It can be understood that the included angle between the vibration direction or the axis direction (or other) and the contact surface 10010 (or other surface) is 0-N°, which means that the included angle can be 0°, i.e. parallel to the contact surface 10010, or greater than 0°, i.e. inclined to the contact surface 10010, but the inclination angle is not greater than N°, for example, the included angle a3 between the axis direction C of the sound outlet hole 1003 and the contact surface 10010 is 0-45°, which means that the axis direction C can be parallel to the contact surface 10010, or inclined to the contact surface 10010 with an included angle not exceeding 45°.

[0119] Next, the connection structure of the air conduction sound production device 3 and the shell assembly 100 and the related features of the front cavity are exemplified.

[0120] In some embodiments, the sound production unit 10 further comprises a front cavity 10042 and a rear cavity 10044, which are separated by the diaphragm 321 of the air conduction sound production device 3, i.e., the side of the diaphragm 321 facing the outside of the shell assembly 100 is the front cavity, and the side of the diaphragm 321 facing the inside of the shell assembly 100 is the rear cavity. The front cavity 10042 is in communication with the sound hole 1003 to produce sound outward. By providing the front cavity 10042, it is beneficial to concentrate the sound produced by the vibration of the diaphragm 321 to be emitted through the front cavity 10042 and the sound hole 1003, thereby improving the sound transmission efficiency and reducing the volume loss, and thereby a smaller volume air conduction sound production device 3 can be used, which is beneficial to the miniaturization of the sound production unit 10. At the same time, it is beneficial to improve the high-frequency sensitivity. It can be understood that the inside and outside of the air conduction sound production device 3 are in communication to enable smooth airflow and balance the internal and external air pressure of the air conduction sound production device 3. Optionally, the air conduction sound production device 3 is provided with at least one air hole 3c in communication with the inside and outside thereof, for example, the air hole 3c can be provided on the magnetic conductive bottom plate 3100 and / or the magnetic conductive side plate 3101 of the magnetic conductive support 310, Figure 6a The case where the air hole 3c is provided on the magnetic conductive bottom plate 3100 is shown. In some cases, sound can be emitted outward through the air hole 3c, for example, referring to Figure 6b When the bottom surface 3b of the air conduction sound production device 3 is arranged towards the sound hole 1003, sound can be emitted outward through the air hole 3c.

[0121] Optionally, the outer contour of the air conduction sound production device 3 in a section perpendicular to the vibration direction B is substantially rectangular, and the outer contour of the front cavity 10042 in a section perpendicular to the vibration direction B is also substantially rectangular, so as to make full use of the internal space of the shell 1000, make the size of the air conduction sound production device 3 in a section perpendicular to the vibration direction B larger, and thereby make the air conduction sound production device 3 be able to increase in volume without increasing in thickness too much, ensure sound production effect, and also make the diaphragm 321 have a larger area, thereby being beneficial to increasing the volume and strengthening the low-frequency effect.

[0122] Figure 10 The frequency response curve of the sound production unit 10 corresponding to different volumes of the front cavity obtained by simulation is shown. In the simulation, the air conduction sound production device 3 produces sound, the bone conduction sound production device 2 does not produce sound, and other parameters remain unchanged except for the volume of the front cavity 10042. As can be seen from the figure, as the volume of the front cavity decreases, the high-frequency cutoff frequency becomes larger, the curve between the high-frequency resonance peak and the low-frequency resonance peak is flatter, and the sound pressure level after the high-frequency resonance peak decays less. The volume of the front cavity 10042 refers to the volume of the space enclosed between the diaphragm assembly 32 and the sound hole 1003. Optionally, the volume of the front cavity 10042 is 10-250mm 3A smaller front cavity 10042 helps extend the resonant frequency of the front cavity to higher frequencies, preventing the high-frequency cutoff frequency from being too high and resulting in low high-frequency sensitivity, thereby improving the sound production effect. However, if the front cavity 10042 is too small, it will affect the normal operation of the diaphragm 321, for example, it may cause the diaphragm 321 to contact the housing and generate noise. In order to provide sufficient vibration space for the diaphragm 321 in the front cavity 10042, while ensuring that the high-frequency cutoff frequency is low, the volume of the front cavity 10042 can be further selected to be 50-200mm. 3 Furthermore, it can be selected as 70-180mm. 3 This makes the volume of the front cavity 10042 more suitable, without taking up too much space, and also helps to ensure the structural strength of the shell.

[0123] In some embodiments, the bone conduction sound generator 2 and the air conduction sound generator 3 are located in the same cavity of the housing assembly 100. On the one hand, this allows the housing assembly 100 to have a larger rear cavity 10044, reducing the F0 of the air conduction sound generator 3 and improving the low-frequency effect. On the other hand, it can effectively utilize the internal space of the housing assembly 100 and reasonably arrange the two sound generators in the space inside the earphone head. Compared with separating the two bone conduction sound generators 2 and air conduction sound generators 3 by a partition, it is beneficial to make the entire earphone head smaller and more compact. At the same time, because the earphone head is smaller, the volume of the housing is also reduced accordingly, which can reduce the weight of the entire earphone head and reduce the burden when wearing it. The weight reduction is also beneficial to improve the frequency response of the high-frequency band of the bone conduction sound transmission part and improve the sound quality of the high-frequency band.

[0124] In some embodiments, reference Figure 6a The housing 1000 is provided with through holes 10000 communicating with its inner and outer sides. 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 1004. The through holes 10000 communicate with the rear cavity 10044, which helps to increase the rear cavity 10044 of the air-conducting sound-generating device 3, thereby reducing F0 and improving low-frequency sensitivity. Figure 6d As shown, Figure 6d The simulation results show the frequency response curves of the sound-generating unit 10 with through-holes 10000 of different total area sizes. During the simulation, the air-conducting sound-generating device 3 emitted sound, while the bone-conducting sound-generating device 2 did not. Except for the change in the area of ​​the through-holes 10000, other parameters remained constant. The figure shows that when the total area of ​​the through-holes 10000 is less than or equal to 0.3 mm... 2 At this time, the frequency response curve is poor, with a large low-frequency F0 exceeding 1000Hz. Optionally, the total area of ​​all 10000 vias can range from 1 to 80 mm². 2 To improve sound quality, the total area of ​​all 10000 through holes can be further selected from 5 to 40 mm. 2, so that the frequency response curve has a smaller low frequency F0, and the curve is more stable, and the sound production effect is better. The area of the through hole 10000 can be understood as the area enclosed by the outer contour of the outer surface of the shell assembly 100.

[0125] The number of through holes 10000 can be one, for example, the area of a single through hole 10000 is 1-80mm 2 , and further optionally 5-40mm 2 . In some embodiments, the number of through holes 10000 is multiple, and the area of a single through hole 10000 is 0.03-3mm 2 , and further optionally 0.05-1mm 2 , so as to increase the rear cavity 10044 while preventing excessive leakage due to the large size of the through hole 10000, and facilitating waterproofing and dustproofing. Optionally, the through hole 10000 is covered with a waterproof mesh and / or a dustproof mesh to achieve waterproofing and dustproofing effects. In other embodiments, the bone conduction sound production device 2 and the air conduction sound production device 3 can be arranged in two separate cavities, for example, separated by a partition, to reduce mutual interference during operation. Optionally, the cavity in which the air conduction sound production device 3 is arranged is provided with a through hole 10000 that communicates with the outside, and the parameters of the through hole 10000 can be referred to above. Alternatively, the cavity in which the bone conduction sound production device 2 is arranged is provided with a through hole 10000, and the partition is provided with a hole that communicates the two cavities.

[0126] The air conduction sound production device 3 is fixedly connected to the shell assembly 100. In some embodiments, the air conduction sound production device 3 is connected to the inner wall of the side shell portion 1004, for example, through its diaphragm 321, air conduction bracket 30, magnet guide side plate 3101 and / or magnet guide bottom plate 3100 (see Figure 23 and Figure 28 ) and the like. In other embodiments, in order to further reduce the occupation of the internal space of the shell assembly 100 by the air conduction sound production device 3, the air conduction sound production device 3 can be embedded in the side shell portion 1004 to reduce the occupation of the internal space of the shell assembly 100 by the air conduction sound production device 3, thereby facilitating the miniaturization of the sound production unit 10, and further improving the firmness of the connection between the air conduction sound production device 3 and the side shell portion 1004. The air conduction sound production device 3 is at least partially embedded in the side shell portion 1004, for example, as shown in Figure 4 and Figure 5The inner wall of the side shell part 1004 is provided with a mounting groove 10041, and the air-conducting sound production device 3 is arranged in the mounting groove 10041. In the illustrated embodiment, the air-conducting sound production device 3 is partially arranged in the mounting groove 10041, and in other embodiments, the air-conducting sound production device 3 can be completely arranged in the mounting groove 10041. The mounting groove 10041 not only saves the space occupied by the air-conducting sound production device 3, but also functions to position the air-conducting sound production device 3. Compared with the scheme of attaching the air-conducting sound production device 3 to the inner wall of the side shell part 1004, there is no need to additionally provide a limiting structure, and further, the mounting groove 10041 makes the contact area of the air-conducting sound production device 3 and the housing assembly 100 relatively larger, and can also increase the firmness of the installation of the air-conducting sound production device 3. Optionally, the depth D14 of the mounting groove 10041 is 0.3-1.5 mm, and the air-conducting sound production device 3 has sufficient embedding depth, thereby increasing the reliability of positioning and connection, and at the same time, the wall thickness of the part of the side shell part 1004 for mounting the air-conducting sound production device 3 is not too thick, which is beneficial to reducing the mass of the sound production unit 10.

[0127] Optionally, the face cover 1001 is connected to the end surface 1000a of the shell 1000, one side of the mounting groove 10041 extends to the end surface 1000a and has an opening facing the end surface 1000a, that is, the mounting groove 10041 is communicated to the end surface 1000a. In this way, the air-conducting sound production device 3 can be directly installed downward from the end surface 1000a, which is more convenient for installation, and the space in the thickness direction of the sound production unit 10 can be more fully utilized, which is beneficial to increasing the volume of the air-conducting sound production device 3 and the effective radiation area of the diaphragm 321, or reducing the volume of the sound production unit 10. Figure 5 In the illustrated embodiment, the mounting groove 10041 is not communicated to the back cover 1002, and the other side of the mounting groove 10041 is spaced apart from the back cover 1002. Further optionally, in other embodiments, the mounting groove 10041 is communicated to the back cover 1002, that is, the other side of the mounting groove 10041 extends to the inner surface of the back cover 1002, so as to further improve the space utilization and increase the size of the air-conducting sound production device 3 available in the thickness direction of the sound production unit 10.

[0128] The air-conducting sound production device 3 can be adhesively connected to the inner wall of the mounting groove 10041 and / or the back cover 1002 and / or the face cover 1001. When the air-conducting sound production device 3 is connected to two or all of the mounting groove 10041, the back cover 1002 and the face cover 1001, the firmness of the connection can be further ensured, and the reliability of the operation of the air-conducting sound production device 3 can be ensured. Optionally, the air-conducting sound production device 3 and the groove bottom surface 10043 of the mounting groove 10041 are adhesively connected, for example, by double-sided adhesive tape or glue coating. Figure 6aIn some embodiments, the outer edge of the diaphragm 321 of the air conduction sound production device 3 (for example, the outer ring 3210 mentioned below) is adhered to the groove bottom surface 10043. In other embodiments, the air conduction sound production device 3 further comprises a gland 33 connected to the diaphragm 321, and the gland 33 can be adhered to the groove bottom surface 10043. In other embodiments, the air conduction sound production device 3 can be adhered to the groove bottom surface 10043 through the magnetic bottom plate 3100 thereof. The air conduction sound production device 3 can also be adhered to the side wall of the mounting groove 10041 and the face cover 1001 through glue, thereby improving the firmness of the connection. Optionally, when the air conduction sound production device 3 is installed in the mounting groove 10041, it is flush with the end surface 1000a of the housing 1000 facing the face cover 1001, so as to facilitate the installation and adhesion of the face cover 1001. Optionally, the air conduction sound production device 3 can also be adhered to the back cover 1002. In some embodiments, a cavity can also be provided on the face cover 1001, and the air conduction sound production device 3 extends into the cavity beyond the end surface 1000a, so as to increase the volume of the air conduction sound production device 3 and improve the space utilization.

[0129] Reference Figure 5 and Figure 6a The side shell part 1004 of the housing 1000 is provided with the front cavity 10042, which communicates the mounting groove 10041 and the sound outlet hole 1003. The front cavity 10042 is arranged corresponding to the sound outlet surface (i.e., the diaphragm 321) of the air conduction sound production device 3, and extends from the groove bottom surface 10043 of the mounting groove 10041 towards the sound outlet hole 1003. It can be understood that the mounting groove 10041 is not necessary. For example, the mounting groove 10041 can not be provided, and the front cavity 10042 can be directly provided on the inner wall of the side shell part 1004 and communicate with the sound outlet hole 1003, and the air conduction sound production device 3 can also be directly connected to the inner wall of the side shell part 1004.

[0130] Next, the bone conduction sound production device 2 of the sound production unit 10 will be described.

[0131] First of all, it should be noted that the bone conduction sound production device 2 and the air conduction sound production device 3 comprise similar components, such as a support, a magnetic circuit assembly, and a coil. In order to facilitate the distinction, the corresponding components of the bone conduction sound production device 2 and the air conduction sound production device 3 are respectively referred to as bone conduction components or air conduction components. For example, the support, the magnetic circuit assembly, and the coil of the bone conduction sound production device 2 are respectively referred to as a bone conduction support, a bone conduction magnetic circuit assembly, and a bone conduction coil, and the support, the magnetic circuit assembly, and the coil of the air conduction sound production device 3 are respectively referred to as an air conduction support, an air conduction magnetic circuit assembly, and an air conduction coil.

[0132] Figure 11a is a structural schematic diagram of the bone conduction sound production device 2 according to some embodiments of the present specification, Figure 11b is Figure 11a is a cross-sectional schematic diagram of the bone conduction sound production device 2 shown in Figure 12is a cross-sectional view of a bone conduction sound production device 2 of some embodiments. The bone conduction sound production device 2 includes a bone conduction support 20, a bone conduction magnetic circuit assembly 21, at least one bone conduction coil 22, and at least one elastic sheet 23. The bone conduction magnetic circuit assembly 21 and the bone conduction coil 22 are both disposed inside the bone conduction support 20, and the elastic sheet 23 is connected between the bone conduction support 20 and the bone conduction magnetic circuit assembly 21. Optionally, the elastic sheet 23 is connected to an end surface 202 of the bone conduction support 20. The bone conduction coil 22 is wrapped around the outside of the bone conduction magnetic circuit assembly 21 and is fixed relative to the bone conduction support 20, and is used to drive the bone conduction magnetic circuit assembly 21 to vibrate. The bone conduction magnetic circuit assembly 21 is connected to the bone conduction support 20 through the elastic sheet 23 and can be reset by the elastic force of the elastic sheet 23. The bone conduction sound production device 2 is connected to the face cover 1001 to transmit vibrations to the face cover 1001, for example, through the bone conduction support 20, the elastic sheet 23, or the connecting member 12, etc. In this specification, the stator of the bone conduction sound production device 2 refers to the part that does not move relative to the housing assembly 100 when the bone conduction sound production device 2 is working, including the bone conduction support 20, the bone conduction coil 22, etc. The vibrator of the bone conduction sound production device 2 refers to the part that moves relative to the bone conduction support 20 when the bone conduction sound production device 2 is working, including the bone conduction magnetic circuit assembly 21, the elastic sheet 23, etc.

[0133] In some embodiments, the bone conduction support 20 is annular, with both ends open, and wrapped around the outside of the bone conduction magnetic circuit assembly 21 and the bone conduction coil 22. Optionally, the bone conduction support 20 is in the shape of a rectangular ring (the four corners can be rounded, right-angled, bevelled, or other curved shapes that reduce the volume of the four corner parts, etc.), which is more convenient for cooperating with the air conduction sound production device 3 to be installed in the housing assembly 100, and more fully utilizes the space in the housing assembly 100. It can be understood that in other embodiments, the shape of the bone conduction support 20 can also be other shapes, such as a circular ring, a racetrack, etc. Figure 13 That is, a schematic view of a bone conduction sound production device 2 when the bone conduction support 20 is in the shape of a racetrack is shown.

[0134] In some embodiments, the bone conduction magnetic circuit assembly 21 comprises at least one magnet 210 and at least two magnetic conductive plates 211, and one magnet 210 is connected between two adjacent magnetic conductive plates 211. The N and S poles of the magnet 210 and the magnet 210 and the magnetic conductive plates 211 are arranged along the vibration direction A of the bone conduction magnetic circuit assembly 21, and when the number of magnets 210 is greater than or equal to two, the polarities of the opposite poles of the two adjacent magnets 210 are the same (i.e. opposite poles attract each other). The bone conduction magnetic gap 24 is formed between the bone conduction magnetic circuit assembly 21 and the bone conduction bracket 20, the outer part of the magnetic conductive plate 211 is surrounded by the bone conduction coil 22, and the bone conduction coil 22 is located in the bone conduction magnetic gap 24 between the bone conduction bracket 20 and the bone conduction magnetic circuit assembly 21. When the bone conduction coil 22 is connected to alternating current, it drives the bone conduction magnetic circuit assembly 21 to reciprocate, and the vibration is transmitted to the bone conduction bracket 20 and the face cover 1001 through the elastic sheet 23. At least one or all of the magnetic conductive plates 211 are surrounded by the bone conduction coil 22, and when all of the magnetic conductive plates 211 are surrounded by the bone conduction coil 22, the number of bone conduction coils 22 corresponds to the number of magnetic conductive plates 211. Alternatively, at least two magnetic conductive plates 211 are surrounded by one bone conduction coil 22 to increase the driving force of the bone conduction coil 22 and improve the volume. In other embodiments, only one magnetic conductive plate 211 can be surrounded by one bone conduction coil 22.

[0135] Figure 11b , Figure 14a , Figure 15a , Figure 16a , Figure 17a , Figure 20a and Figure 20b shows a structural schematic diagram of the bone conduction magnetic circuit assembly 21 according to some embodiments of the present specification.

[0136] Figure 11b , Figure 14a and Figure 20a In the embodiment shown, the bone conduction magnetic circuit assembly 21 comprises one magnet 210 and two magnetic conductive plates 211 arranged along the vibration direction A, and the two magnetic conductive plates 211 are connected to the two sides of the magnet 210. The outer part of each of the two magnetic conductive plates 211 is surrounded by one bone conduction coil 22. Figure 11b , Figure 14a and Figure 20a The difference between the structures shown is that Figure 11b the magnetic conductive plate 211 shown is provided with a boss 2113 and a recess 2114, Figure 14a the magnetic conductive plate 211 shown is provided with a boss 2113 and is not provided with a recess 2114, Figure 20a and Figure 20b the magnetic conductive plate 211 is connected with a gasket 26, Figure 20a and Figure 20b The difference between the two is the structure of the bone conduction magnetic circuit assembly 21.

[0137] Figure 15a In the illustrated embodiment, the bone conduction magnetic circuit assembly 21 includes three magnets 210 and two magnetic conductive plates 211 arranged along the vibration direction A, and one magnetic conductive plate 211 is connected between two adjacent magnets 210. The two adjacent magnets 210 are arranged with the same polarity. The outer part of the magnetic conductive plate 211 between the two adjacent magnets 210 is surrounded by the bone conduction coil 22. Compared with the single magnet structure, the three-magnet structure can increase the sensitivity.

[0138] Figure 16a In the illustrated embodiment, the bone conduction magnetic circuit assembly 21 includes three magnets 210 and two magnetic conductive plates 211 arranged along the vibration direction A, and one magnetic conductive plate 211 is connected between two adjacent magnets 210. The two adjacent magnets 210 are arranged with the same polarity. The outer part of the magnetic conductive plate 211 between the two adjacent magnets 210 is surrounded by the bone conduction coil 22. Compared with the single magnet structure, the three-magnet structure can increase the sensitivity.

[0139] Figure 17a In the illustrated embodiment, the bone conduction magnetic circuit assembly 21 includes three magnets 210 and two magnetic conductive plates 211 arranged along the vibration direction A, and one magnetic conductive plate 211 is connected between two adjacent magnets 210. The two adjacent magnets 210 are arranged with the same polarity. The outer part of the magnetic conductive plate 211 between the two adjacent magnets 210 is surrounded by the bone conduction coil 22. Compared with the single magnet structure, the three-magnet structure can increase the sensitivity.

[0140] It can be understood that in other embodiments, the bone conduction magnetic circuit assembly 21 can also include two magnets 210 and one magnetic conductive plate 211 arranged along the vibration direction A, and the two magnets 210 are respectively connected to the two sides of the magnetic conductive plate 211, and one bone conduction coil 22 is arranged outside the magnetic conductive plate 211.

[0141] The above-mentioned bone conduction magnetic circuit assembly 21 can be installed in the bone conduction sound generating device 2 and assembled into the sound generating unit 10, for example, Figure 12 and Figure 6c that is, respectively shows the application of the bone conduction magnetic circuit assembly 21 to the bone conduction sound generating device 2 and the sound generating unit 10. Figure 15a The bone conduction magnetic circuit assembly 21 shown is applied to the bone conduction sound generating device 2 and the sound generating unit 10.

[0142] The number of elastic sheets 23 can be one, two or more. In some embodiments, as shown in the figure, Figure 11a and Figure 11bAs shown, the bone conduction sound generating device 2 includes two elastic sheets 23, which are arranged at intervals along the vibration direction A. Optionally, the two elastic sheets 23 are arranged at two ends of the bone conduction magnetic circuit assembly 21 along the vibration direction A, which can improve the stability of vibration and is conducive to preventing the bone conduction magnetic circuit assembly 21 from swinging (or rolling) during vibration, thereby reducing the risk of impacting the side components. The elastic sheet 23 is in the form of a sheet as a whole, and the thickness B2 thereof is 0.1 mm to 0.25 mm, and further optionally 0.13 mm to 0.2 mm. Figure 18 The elastic sheet 23 includes an outer frame body 230, an inner frame body 231 located inside the outer frame body 230, and at least two elastic arms 232 connected between the outer frame body 230 and the inner frame body 231. The outer frame body 230 is connected to the bone conduction support 20, and optionally, the elastic sheet 23 is attached to the end surface 202 of the bone conduction support 20. The outer frame body 230 and the bone conduction support 20 can be connected by means of gluing or welding.

[0143] It can be understood that the longer the length of the elastic arm 232 is, the more conducive it is to reduce the K value (stiffness coefficient) of the elastic sheet 23. In some embodiments, the K value (stiffness coefficient) of a single elastic sheet 23 ranges from 1000 N / m to 3000 N / m, and the K value of two elastic sheets 23 combined ranges from 2000 N / m to 6000 N / m. Further optionally, the K value of a single elastic sheet 23 is 1500 N / m to 2500 N / m, and the K value of two elastic sheets 23 combined ranges from 3000 N / m to 5000 N / m. The stiffness coefficient of the elastic sheet 23 affects the low frequency F0 of the bone conduction sound generating device 2. By setting the above range, a more suitable low frequency F0 range (100 Hz to 300 Hz) can be obtained, so that the bone conduction sound generating device 2 has good low frequency effect. For example, referring to Figure 19 By setting the K value of two elastic sheets 23 combined to range from 2000 N / m to 6000 N / m and setting the vibrator mass of the bone conduction sound generating device 2 to be 2 to 2.8 g, the F0 of the bone conduction sound generating device 2 can be set to 100 Hz to 300 Hz. Specifically, the F0 shown in the figure is between 130 Hz and 280 Hz. The stiffness coefficient of the elastic sheet 23 can be adjusted by controlling the wall thickness, the size of the elastic arm 232, and the material of the elastic sheet.

[0144] It can be understood that the bone conduction magnetic circuit assembly 21 can be connected by multiple parts (separate type), and can be formed by one-piece magnetization when the structure can be realized. When connected by multiple parts, the magnet 210 and the magnetic conducting plate 211 are independent parts, and each independent part is connected to form the bone conduction magnetic circuit assembly 21 by gluing or other means. When the bone conduction magnetic circuit assembly 21 is made by one-piece magnetization, the bone conduction magnetic circuit assembly 21 is a single part (one-piece), and the magnet 210 and the magnetic conducting plate 211 are part of the part, without the need for connection process to form the bone conduction magnetic circuit assembly 21. Therefore, the bone conduction magnetic circuit assembly 21 formed by one-piece magnetization usually has higher dimensional accuracy. It should be noted that the bone conduction magnetic circuit assembly 21 is one-piece, which means that at least the whole of the magnet 210 and the magnetic conducting plate 211 is a one-piece single part, and the spacer used for connecting the bone conduction magnetic circuit assembly 21 and the elastic sheet 23 can be an independent part or one-piece. For example, Figure 14b 、 Figure 15b 、 Figure 16b and Figure 17b respectively show the schematic diagram of the one-piece bone conduction magnetic circuit assembly corresponding to the separate type bone conduction magnetic circuit assembly shown in Figure 14a 、 Figure 15a 、 Figure 16a and Figure 17a , in which the boundary between the two independent parts is shown by a solid line, and the boundary between different parts (magnetic conducting plate 211 and magnet 210) in the one-piece part is shown by a dashed line, Figure 15b and Figure 17b The spacer (pad 26) in Figure 14b and Figure 16b The spacer (boss 2113) in the bone conduction magnetic circuit assembly is one-piece. The one-piece magnetization method can refer to the patent document with application number 202111062238.3, the whole content of which is incorporated herein by reference.

[0145] Next, the air conduction sound generating device 3 of the sound generating unit 10 will be described.

[0146] In some embodiments, as Figure 21 to Figure 23 、 Figure 27 to Figure 30As shown, the air conduit sound production device 3 comprises an annular air conduit support 30, and an air conduit magnetic circuit assembly 31 and a diaphragm assembly 32 which are connected to the air conduit support 30. The air conduit support 30 can be made of light material (e.g. plastic) to reduce the mass and density of the air conduit sound production device 3, and optionally, the air conduit support 30 is non-magnetic. The diaphragm assembly 32 comprises an air conduit coil 320 located in the magnetic field of the air conduit magnetic circuit assembly 31 and a diaphragm 321 connected between the air conduit coil 320 and the air conduit support 30. When an alternating current is passed through the air conduit coil 320, it will generate a mutual force with the magnetic field of the air conduit magnetic circuit assembly 31, thereby driving the diaphragm 321 to vibrate.

[0147] Next, the air conduit magnetic circuit assembly 31 of the air conduit sound production device 3 will be described first.

[0148] The air conduit magnetic circuit assembly 31 comprises at least a magnetic conductive support 310 connected to the bottom of the air conduit support 30, a main magnet 311 arranged on the surface of the magnetic conductive support 310 facing the diaphragm assembly 32, and a main pole core plate 313 connected to the main magnet 311.

[0149] The magnetic conductive support 310 is made of magnetic conductive material and comprises a plate-shaped magnetic conductive bottom plate 3100. Optionally, the thickness of the magnetic conductive bottom plate 3100 is 0.3-0.6 mm to have good magnetic conductive effect and to facilitate preventing magnetic leakage. In some embodiments, referring to Figure 23 and Figure 28 The magnetic conductive support 310 further comprises magnetic conductive side plates 3101 protruding from the side edges of the magnetic conductive bottom plate 3100 towards the diaphragm assembly 32, and the magnetic conductive side plates 3101 at least partially extend to be oppositely arranged with the main pole core plate 313, and there is a gap between the magnetic conductive side plates 3101 and the main pole core plate 313, thereby forming an air conduit magnetic gap 315. Optionally, the magnetic conductive bottom plate 3100 is rectangular, and the magnetic conductive side plates 3101 can be arranged only on two opposite sides of the magnetic conductive bottom plate 3100, or on all four sides of the magnetic conductive bottom plate 3100, or a magnetic conductive ring 3102 can be arranged on the magnetic conductive bottom plate 3100. Figure 24 to Figure 26 A top view of the magnetic conductive support 310 according to some embodiments of the present application is shown to facilitate showing the positions and numbers of the magnetic conductive side plates 3101. Figure 24 In the shown embodiment, one magnetic conductive side plate 3101 is arranged at each of the two short sides of the magnetic conductive bottom plate 3100, Figure 25 In the shown embodiment, one magnetic conductive side plate 3101 is arranged at each of the two long sides of the magnetic conductive bottom plate 3100, Figure 26 In the shown embodiment, one magnetic conductive side plate 3101 is arranged at each of the four sides of the magnetic conductive bottom plate 3100. It can be understood that the magnetic conductive side plates 3101 can be independent of each other, or can be connected to form a ring, and in some embodiments, as shown in Figure 27 to Figure 30 Figure 28 ​is Figure 27 a sectional view of the air-guided sound production device 2 shown in FIG. 1, Figure 29 is Figure 28 a magnified view of the III part in FIG. 2, Figure 30 is Figure 27 a perspective view of the magnetic conductive support 310, the main magnet 311 and the main pole core plate 313 in FIG. 2. The magnetic conductive support 310 includes a magnetic conductive bottom plate 3100 and a magnetic conductive ring 3102 protruding from the side edges of the magnetic conductive bottom plate 3100 towards the diaphragm assembly 32, and the magnetic conductive ring 3102 is connected by four magnetic conductive side plates 3101. The magnetic conductive ring 3102 surrounds the outside of the main pole core plate 313 to form an air-guided magnetic gap 315, and the air-guided coil 320 extends into the air-guided magnetic gap 315.

[0150] In some embodiments, reference is made to Figure 31 , Figure 31 for along Figure 23 a sectional view taken along the J-J sectional line in FIG. 2, the air-guided magnetic circuit assembly 31 further includes a secondary magnet 312 connected to the magnetic conductive bottom plate 3100 to increase the BL value of the air-guided coil 320. The number of the secondary magnet 312 can be one or more. Optionally, the number of the secondary magnet 312 is even, and the opposite two secondary magnets 312 are respectively located on the two sides of the main magnet 311. In some embodiments, the air-guided magnetic circuit assembly 31 further includes a secondary pole core plate 314 connected to the secondary magnet 312. Optionally, at least one secondary pole core plate 314 is connected to the surface of each secondary magnet 312 facing the diaphragm assembly 32 to improve the magnetic conductive effect. The secondary pole core plate 314 and the main pole core plate 313 are at least partially opposite to each other, and the air-guided magnetic gap 315 is formed between the secondary pole core plate 314 and the main pole core plate 313. Optionally, the distance between each secondary magnet 312 and the main magnet 311 is the same, and further optionally, the distance between each secondary pole core plate 314 and the main pole core plate 313 is the same, so that the air-guided magnetic gap 315 is substantially equal in width, and the magnetic field distribution in the magnetic gap is more uniform. Figure 32 to Figure 34 is a top view of the air-guided magnetic circuit assembly 31 to show the positions and numbers of the secondary pole core plates 314 and the secondary magnets 312. Figure 32 In the embodiment shown, one secondary magnet 312 and one secondary pole core plate 314 are respectively arranged at the two short edges of the magnetic conductive bottom plate 3100. Figure 33 In the embodiment shown, one secondary magnet 312 and one secondary pole core plate 314 are respectively arranged at the two long edges of the magnetic conductive bottom plate 3100. Figure 34In the illustrated embodiment, a secondary magnet 312 and a secondary pole plate 314 are respectively provided on each of the four sides of the magnetically conductive base plate 3100. Optionally, the two ends of the secondary pole plate 314 extend beyond the two ends of the secondary magnet 312 in the length direction to further improve the magnetic conductivity. The distance L9 by which the secondary pole plate 314 extends beyond the secondary magnet 312 in the length direction can be 0.03 to 0.2 mm. Optionally, the two ends of the secondary pole plate 314 extend beyond the secondary magnet 312 by the same distance.

[0151] The magnetic poles of the main magnet 311 are arranged along the vibration direction B of the air-conducting sound-generating device 3, and the magnetic poles of the auxiliary magnet 312 are also arranged along the vibration direction B, but in the opposite direction to the magnetic poles of the main magnet 311. It can be understood that the vibration direction B of the air-conducting sound-generating device 3 is consistent with the vibration direction of the diaphragm 321. The auxiliary magnet 312 enhances the magnetic field strength and increases the BL value, thereby improving the sensitivity of the air-conducting sound-generating device 3. The auxiliary pole core plate 314 guides the magnetic field lines, and its cooperation with the main pole core plate 313 allows the magnetic field lines of the main magnet 311 and the auxiliary magnet 312 to pass more concentratedly through the air-conducting coil 320 of the diaphragm assembly 32, improving the driving force and sensitivity.

[0152] It is understood that a magnetically conductive side plate 3101 may or may not be provided on the outer side of the auxiliary magnet 312. Optionally, when the auxiliary magnet 312 is provided on one side of the main magnet 311, the magnetically conductive side plate 3101 is not provided on that side to reduce weight and size. In some embodiments, such as Figure 35 As shown, Figure 35 It shows Figure 21 A schematic diagram of the air-conducting magnetic circuit assembly 31 of the air-conducting sound-generating device 3. Magnetic guide plates 3101 are provided on both short sides of the magnetic base plate 3100, but not on the long side. A secondary magnet 312 is correspondingly provided on the long side of the magnetic base plate 3100. Optionally, the distance between the magnetic guide plate 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.

[0153] The diaphragm assembly 32 of the air-conducting sound-generating device 3 will be illustrated with an example next.

[0154] like Figure 29 , Figure 36 , Figure 37 and Figure 38As shown, the diaphragm 321 includes an outer ring sheet 3210 connected with the air guide support 30, a middle sheet body 3211 in a flat sheet shape located inside the outer ring sheet 3210, and a folded ring portion 3212 located between the outer ring sheet 3210 and the middle sheet body 3211, which encloses the area between the outer ring sheet 3210 and the middle sheet body 3211. The cross section of the folded ring portion 3212 is arc-shaped, which can be concave towards the side where the air guide magnetic circuit assembly 31 is located (see Figure 36 and Figure 38 ), or can be convex towards the side away from the side where the air guide magnetic circuit assembly 31 is located (see Figure 29 and Figure 37 ). Optionally, the outer ring sheet 3210 is connected to the end surface 300 of the air guide support 30, for example, by adhesive connection (e.g., glue coating connection or double-sided adhesive connection).

[0155] One end of the air guide coil 320 is connected with the middle sheet body 3211 of the diaphragm 321, and the other end extends into the air guide magnetic gap 315, which is wrapped around the outside of the main pole core plate 313 and located inside the magnetic guide side plate 3101. The main pole core plate 313 and the magnetic guide side plate 3101 can guide and converge the magnetic induction lines, so that the magnetic induction lines pass through the coil more concentratedly and uniformly, thereby improving the sensitivity and driving force. When the air guide coil 320 is connected with alternating current, it will reciprocate under the interaction with the magnetic field, thereby driving the diaphragm 321 to vibrate, which pushes the air to vibrate and make sound.

[0156] In some embodiments, referring to Figure 23 and Figure 37 , in order to enhance the strength of the middle sheet body 3211 and improve the sound quality, the diaphragm assembly 32 further includes a reinforcing sheet 3213 attached to the surface of the middle sheet body 3211. The material of the reinforcing sheet 3213 can be the same as or different from that of the diaphragm 321.

[0157] In some embodiments, the stiffness coefficient of the diaphragm 321 is 30 N / m to 450 N / m, and further optionally 50 N / m to 200 N / m. The stiffness coefficient of the diaphragm 321 affects the low frequency F0 of the air guide sound generating device 3, and selecting the aforementioned stiffness coefficient range is conducive to obtaining a more appropriate F0 range (50 Hz to 280 Hz). For example, when the stiffness coefficient of the diaphragm 321 is set to 30 N / m to 450 N / m, and the mass of the diaphragm assembly 32 is 0.03 g to 0.15 g, the F0 of the air guide sound generating device 3 can be 50 Hz to 280 Hz. It can be understood that the stiffness coefficient can be adjusted by controlling the material, thickness, size of the folded ring portion 3212, number and size of the convexities 32140 of the wrinkle pattern 3214, and other parameters of the diaphragm 321.

[0158] Optionally, the total stiffness coefficient of the elastic sheet 23 of the bone conduction sound generating device 2 (i.e. the sum of the stiffness coefficients of all the elastic sheets 23) is greater than the stiffness coefficient of the diaphragm 321, and optionally, the ratio of the total stiffness coefficient of the two elastic sheets 23 to the stiffness coefficient of the diaphragm 321 ranges from 10 to 130, and further optionally from 15 to 90.

[0159] By adjusting the stiffness coefficients of the elastic sheet 23 and the diaphragm 321 and the masses of the vibrating parts of the bone conduction sound generating device 2 and the air conduction sound generating device 3, the low frequency F0 of the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be made closer.

[0160] For example, the total stiffness coefficient of all the elastic sheets 23 of the bone conduction sound generating device 2 is set to 2000 N / m to 6000 N / m, and the mass of the vibrator of the bone conduction sound generating device 2 is set to 2 to 2.8 g, which is conducive to making the low frequency F0 of the bone conduction sound generating device 2 be between 100 to 300 Hz. The stiffness coefficient of the diaphragm 321 is set to 30 N / m to 450 N / m, and the mass of the diaphragm assembly 32 is set to 0.03 to 0.15 g, which is conducive to making the low frequency F0 of the air conduction sound generating device 3 be between 50 to 280 Hz, and is conducive to adjusting the ratio of the low frequency F0 of the bone conduction sound generating device 2 to the low frequency F0 of the air conduction sound generating device 3 to be 1 to 4.

[0161] For example, the total stiffness coefficient of all the elastic sheets 23 of the bone conduction sound generating device 2 is set to 2000 N / m to 6000 N / m, and the mass of the vibrator of the bone conduction sound generating device 2 is set to 2 to 2.8 g, which is conducive to making the low frequency F0 of the bone conduction sound generating device 2 be between 100 to 300 Hz. The stiffness coefficient of the diaphragm 321 is set to 30 N / m to 450 N / m, and the mass of the diaphragm assembly 32 is set to 0.03 to 0.15 g, which is conducive to making the low frequency F0 of the air conduction sound generating device 3 be between 50 to 280 Hz, and is conducive to adjusting the ratio of the low frequency F0 of the bone conduction sound generating device 2 to the low frequency F0 of the air conduction sound generating device 3 to be 1 to 4.

[0162] For example, the total stiffness coefficient of all the elastic sheets 23 of the bone conduction sound generating device 2 is set to 2000 N / m to 6000 N / m, and the mass of the vibrator of the bone conduction sound generating device 2 is set to 2 to 2.8 g, which is conducive to making the low frequency F0 of the bone conduction sound generating device 2 be between 100 to 300 Hz. The stiffness coefficient of the diaphragm 321 is set to 30 N / m to 450 N / m, and the mass of the diaphragm assembly 32 is set to 0.03 to 0.15 g, which is conducive to making the low frequency F0 of the air conduction sound generating device 3 be between 50 to 280 Hz, and is conducive to adjusting the ratio of the low frequency F0 of the bone conduction sound generating device 2 to the low frequency F0 of the air conduction sound generating device 3 to be 1 to 4.

[0163] In some embodiments, the mass ratio of the vibrator and the stator of the bone conduction sound generating device 2 is 1.3-3.5. A large vibrator mass is conducive to increasing the mass of the bone conduction magnetic circuit assembly 21, thereby providing greater driving force and improving the sensitivity of the bone conduction sound generating device 2. However, if the stator portion is too small, for example, the mass of the bone conduction support 20 is small, it can affect the magnetic conduction performance, thereby reducing the driving force and sensitivity in turn. Setting the mass ratio of the vibrator and the stator of the bone conduction sound generating device 2 to 1.3-3.5 is conducive to achieving better driving force and sensitivity. Optionally, the vibrator mass of the bone conduction sound generating device 2 (including the total mass of the bone conduction magnetic circuit assembly 21, the spring 23, etc.) is 2-2.8g, and the stator mass of the bone conduction sound generating device 2 (including the total mass of the bone conduction support 20, the bone conduction coil 22, the coil holder 27 (if any) and the external circuit board 25 (if any), etc.) is 0.8-1.5g. The vibrator mass can be matched with the K value of the spring 23 to achieve the desired F0 range, so the low frequency F0 (for example, adjusted to 100-300Hz) can be adjusted by the vibrator mass and the stiffness coefficient of the spring 23. The stator mass affects the high frequency cutoff frequency of the bone conduction sound generating device 2, and the mass range of 0.8-1.5g is in a small stator mass range, which can make the high frequency cutoff frequency move backward, thereby improving the sensitivity of the medium and high frequencies.

[0164] As a further improvement, the mass ratio of the vibrator and the stator of the bone conduction sound generating device 2 is 1.8-2.8 to further ensure that the bone conduction sound generating device 2 has better driving force and sensitivity. Optionally, the vibrator mass of the bone conduction sound generating device 2 is 2.3-2.6g, and the stator mass of the bone conduction sound generating device 2 is 1-1.3g.

[0165] Optionally, the mass of the magnet 210 is 1.3-1.7g, the mass of a single magnetic conduction plate 211 is 0.3-0.5g, the mass of a single spring 23 is 0.08-0.13g, and the mass of the bone conduction support 20 is 0.6-1g.

[0166] In some embodiments, the mass of the diaphragm assembly 32 is 0.03-0.07 g, and the mass of the stator of the air-conduction sound generating device 3 is 0.55-1.55 g. It can be understood that the diaphragm assembly 32 of the air-conduction sound generating device 3 is its vibrator (vibrating part), and the remaining part thereof does not vibrate when the diaphragm assembly 32 vibrates, which belongs to the stator part. Alternatively, the mass ratio of the vibrator and the stator of the air-conduction sound generating device 3 is 0.02-0.12, the mass of the vibrating part accounts for a small proportion, and a smaller driving force can be used to make it vibrate, and the air-conduction magnetic circuit assembly 31 can have a relatively large volume, thereby improving the magnetic field strength, which is conducive to improving the driving force and the sensitivity value. However, if the mass of the vibrator of the air-conduction sound generating device 3 is too small, the wire length of the air-conduction coil 320 will be affected, which in turn leads to a decrease in the BL value, and the driving force and the sensitivity value are reduced. By setting the parameters in the above-mentioned range, a better driving force and sensitivity can be obtained.

[0167] Alternatively, the mass of the air-conduction magnetic circuit assembly 31 is 0.35-0.8 g, and the mass ratio of the air-conduction magnetic circuit assembly 31 to the air-conduction sound generating device 3 is 0.4-0.75. The mass and the mass ratio of the air-conduction magnetic circuit assembly 31 are large, which is conducive to ensuring the BL value and the sensitivity, and ensuring the structural strength of the air-conduction support 30.

[0168] It should be noted that the embodiments herein can be combined with each other to obtain more embodiments without conflict.

[0169] The above is only a specific implementation of the present application, and any improvement made on the basis of the concept of the present application is considered to be within the protection scope of the present application.

Claims

1. A sound emitting unit, characterized by, The sound generating unit (10) is in contact with the human face skin when worn, and the sound generating unit (10) comprises independently arranged bone conduction sound generating device (2) and air conduction sound generating device (3). The bone conduction sound generating device (2) and the air conduction sound generating device (3) can be independently controlled to generate sound, and the minimum value of the difference between the working frequency band of the bone conduction sound generating device (2) and the low frequency resonance point of the bone conduction sound generating device (2) is greater than or equal to 20 Hz.

2. The sound producing unit of claim 1, wherein, The working frequency bands of the bone conduction sound generating device (2) and the air conduction sound generating device (3) are different at least in part, and the air conduction sound generating device (3) works at least in the frequency band in which the bone conduction sound generating device (2) does not work.

3. The sound producing unit of claim 1, wherein, The low frequency resonance point of the bone conduction sound generating device (2) is greater than the low frequency resonance point of the air conduction sound generating device (3), and the working frequency band of the bone conduction sound generating device (2) is greater than the low frequency resonance point of the bone conduction sound generating device (2).

4. The sound producing unit of claim 1, wherein, The working frequency bands of the bone conduction sound generating device (2) and the air conduction sound generating device (3) have a frequency division point, the bone conduction sound generating device (2) works in the frequency band above the frequency division point, the air conduction sound generating device (3) works in the frequency band below the frequency division point, the frequency of the frequency division point is greater than the frequency of the low frequency resonance point of the bone conduction sound generating device (2), and the difference is not less than 20 Hz.

5. The sound producing unit of claim 4, wherein, The frequency division point is located at 150 Hz to 400 Hz.

6. The sound producing unit of claim 5, wherein, The frequency division point is located at 170 Hz to 300 Hz.

7. The sound producing unit of claim 1, wherein, The working frequency bands of the bone conduction sound generating device (2) and the air conduction sound generating device (3) have overlapping frequency bands.

8. The sound producing unit of claim 7, wherein, In the non-overlapping working frequency bands of the bone conduction sound generating device (2) and the air conduction sound generating device (3), the working frequency band of the bone conduction sound generating device (2) is greater than the working frequency band of the air conduction sound generating device (3).

9. The sound producing unit of claim 7, wherein, The range of the overlapping frequency band is greater than or equal to 100 Hz.

10. The sound producing unit of claim 7, wherein, The working frequency band of the bone conduction sound generating device (2) is greater than or equal to 300 Hz, and the working frequency band of the air conduction sound generating device (3) is less than or equal to 400 Hz.

11. The sound producing unit of claim 7, wherein, The working frequency band of the bone conduction sound generating device (2) is greater than or equal to 500 Hz, and the working frequency band of the air conduction sound generating device (3) is less than or equal to 800 Hz.

12. The sound producing unit of claim 1, wherein, The air conduction sound generating device (3) generates sound in the full frequency band of 20 Hz to 20 kHz.

13. The sound producing unit of claim 1, wherein, The low frequency resonance point of the bone conduction sound generating device (2) is 100 Hz to 300 Hz, and the low frequency resonance point of the air conduction sound generating device (3) is 50 Hz to 280 Hz.

14. The sound producing unit of any one of claims 1 to 13, wherein, The high frequency cutoff frequency range of the air conduction sound generating device (3) is 3000 Hz to 20000 Hz.

15. The sound producing unit of claim 14, wherein, The high frequency cutoff frequency range of the air conduction sound generating device (3) is 5000 Hz to 20000 Hz.

16. A head-mounted sound production device, comprising: The head-mounted sound generating device comprises a control chip (1120), a first power amplifier (1121) and a second power amplifier (1122), the first power amplifier (1121) is electrically connected between the control chip (1120) and the bone conduction sound generating device (2), and the second power amplifier (1122) is electrically connected between the control chip (1120) and the air conduction sound generating device (3).

17. The head-mounted sound production device of claim 16, wherein, ​ 18. The head-mounted sound production device of claim 16, wherein, The head-mounted sound production device comprises an EQ adjustment module, and the sound effects of the bone conduction sound production device (2) and the air conduction sound production device (3) can be independently adjusted through the EQ adjustment module.

19. The head-mounted sound production device of claim 18, wherein, Through the EQ adjustment module, the gain of the bone conduction sound production device (2) in the frequency band of 20Hz-100Hz is increased, the gain in the range of low frequency F0±30Hz is reduced, and the gain in the frequency band above 2kHz is increased. Through the EQ adjustment module, the gain of the bone conduction sound production device (2) in the frequency band of 20Hz-100Hz is increased by 2dB-6dB, the gain in the range of low frequency F0±30Hz is reduced by 3dB-6dB, and the gain in the frequency band above 2kHz is increased by 2dB-8dB.

20. The head-mounted sound production device of claim 19, wherein, Through the EQ adjustment module, the gain of the bone conduction sound production device (2) in the frequency band of 20Hz-100Hz is increased by 2dB-6dB, the gain in the range of low frequency F0±30Hz is reduced by 3dB-6dB, and the gain in the frequency band above 2kHz is increased by 2dB-8dB. Through the EQ adjustment module, the gain of the bone conduction sound production device (2) in the frequency band of 20Hz-100Hz is increased by 2dB-6dB, the gain in the range of low frequency F0±30Hz is reduced by 3dB-6dB, and the gain in the frequency band above 2kHz is increased by 2dB-8dB. Through the EQ adjustment module, the gain of the bone conduction sound production device (2) in the frequency band of 20Hz-100Hz is increased by 2dB-6dB, the gain in the range of low frequency F0±30Hz is reduced by 3dB-6dB, and the gain in the frequency band above 2kHz is increased by 2dB-8dB.

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