Sound production unit and head-mounted sound production equipment

Abstract

The utility model discloses a sounding unit and a head-mounted sounding device, and relates to the sounding device technology field, the sounding unit comprises a housing assembly, a bone conduction sounding device and an air conduction sounding device, the bone conduction sounding device and the air conduction sounding device are arranged in the housing assembly, the housing assembly is provided with a sound outlet hole for the sound of the air conduction sounding device to be transmitted out, and the sound outlet hole is provided with a sound outlet. The air conduction sounding device comprises an air conduction support, an air conduction magnetic circuit assembly and a diaphragm assembly. The air-conductive magnetic circuit assembly is arranged in the air-conductive bracket and comprises an air-conductive magnetic gap; the vibrating diaphragm assembly comprises a vibrating diaphragm connected with the air conduction support and an air conduction coil connected with the vibrating diaphragm, and the air conduction coil is located in the air conduction magnetic gap; the effective radiation area Sd of the vibrating diaphragm is 0.5 cm < 2 >-1.4 cm < 2 >, so that the air conduction sound production device has proper sensitivity, better sound quality is obtained, and the sound production effect is improved.

Description

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

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

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

[0004] Bone conduction sound production devices usually include a coil and a magnetic circuit assembly. The coil drives the magnetic circuit assembly to vibrate. Bone conduction sound production devices are usually connected to a shell (such as the shell of an earphone head). The shell transmits vibrations to the human face skin, allowing the human to hear the sound.

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

[0006] With the development of technology, head-mounted sound production equipment has become more mature and perfect, but there is still room for improvement to meet users' higher demands for head-mounted sound production equipment.

[0007] For example, in traditional earphones, there are usually only bone conduction sound production devices or air conduction sound production devices, which can only produce sound through bone conduction or air conduction. The applicant found that if bone conduction sound production devices and air conduction sound production devices are simultaneously provided in a sound production unit, it is beneficial to improve the sound production effect and expand the sound production method. However, the space in the earphone head is limited, and the sound production effect of the air conduction sound production device may be affected due to the small size of the air conduction sound production device, thereby affecting the overall sound production effect of the sound production unit.

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

[0009] For another example, the provision of air conduction sound production devices may result in a larger sound leakage when the head-mounted sound production equipment is in operation.

[0010] 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 (sound leakage prevention) of head-mounted sound production equipment.

[0011] The above is only used to help understand the technical solutions of the present application and does not constitute an acknowledgement of the above as prior art. Utility model content

[0012] The utility model discloses a sound unit and head-mounted sound equipment, which are favorable for improving the sound effect of the sound unit.

[0013] To realize the utility model purpose, on one hand, the utility model provides a sound unit, including shell assembly and bone conduction sound device and air conduction sound device that are all arranged in the shell assembly, the shell assembly is equipped with the sound hole that the air conduction sound device's sound transmits, the air conduction sound device includes:

[0014] Air conduction support;

[0015] Air conduction magnetic circuit component, is arranged in the air conduction support, including air conduction magnetic gap;And,

[0016] Diaphragm component, including the diaphragm that is connected with the air conduction support and the air conduction coil that is connected with the diaphragm, the air conduction coil is located in the air conduction magnetic gap;

[0017] The effective radiation area Sd of the diaphragm is 0.5cm2~1.4cm2.

[0018] Further, the ratio of the effective radiation area Sd to the area of the entire diaphragm is 0.55~0.75.

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

[0020] Compared with the prior art, the utility model has the following beneficial effects: according to at least one embodiment of the present application, the sound unit simultaneously includes bone conduction sound device and air conduction sound device, can utilize bone conduction sound device and air conduction sound device to sound, and is favorable for improving the sound effect. In addition, the effective radiation area Sd of the air conduction sound device is 0.5cm 2 ~1.4cm 2 , which is favorable for ensuring that the air conduction sound device has appropriate sensitivity, simultaneously favorable for making the volume of the air conduction sound device more appropriate, favorable for balancing the sound performance of the air conduction sound device and the bone conduction sound device, and further improving the overall sound effect of the earphone. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is the structure schematic diagram of the head-mounted sound equipment of some embodiments in the utility model.

[0022] Figure 2 is the contact angle schematic diagram of the function warehouse side surface and the contact surface of the sound unit of some embodiments in the utility model.

[0023] Figure 3 is a schematic view of a sound production unit of some embodiments of the present application.

[0024] Figure 4 is a cross-sectional view of a sound production unit of some embodiments of the present application, in which the shell is integrated.

[0025] Figure 5 is a cross-sectional view of a sound production unit of some embodiments of the present application, in which the shell is split.

[0026] Figure 6 is a structural schematic view of a sound production unit of some embodiments of the present application.

[0027] Figure 7 is an exploded view of the sound production unit shown in Figure 6

[0028] Figure 8a is a cross-sectional view of the sound production unit shown in Figure 6

[0029] Figure 8b is a structural schematic view of a sound production unit of some embodiments of the present application.

[0030] Figure 8c is a structural schematic view of a sound production unit of some embodiments of the present application, in which the structure of the bone conduction magnetic circuit assembly is consistent with that in Figure 17a

[0031] Figure 9 is a cross-sectional view of a sound production unit of some embodiments of the present application.

[0032] Figure 10 is a schematic view of a sound production unit of some embodiments of the present application.

[0033] Figure 11 is a frequency response curve diagram of a sound production unit of some embodiments of the present application with sound holes of different areas.

[0034] Figure 12 is a frequency response curve diagram of a sound production unit of some embodiments of the present application with front cavities of different volumes.

[0035] Figure 13a is a structural schematic view of a bone conduction sound production device of some embodiments of the present application.

[0036] Figure 13b is a cross-sectional view of the bone conduction sound production device shown in Figure 13a

[0037] Figure 14 ​​​​is the cross-sectional view schematic diagram of the bone conduction sound generating device of some embodiments of the utility model, the structure of bone conduction magnetic circuit assembly in the drawing is identical with Figure 17a

[0038] Figure 15 is the structure schematic diagram of the bone conduction sound generating device of some embodiments of the utility model, in the drawing, bone conduction support is runway shape.

[0039] Figure 16a is the structure schematic diagram of the bone conduction magnetic circuit assembly of some embodiments of the utility model.

[0040] Figure 16b is Figure 16a When the bone conduction magnetic circuit assembly shown in the drawing is integral part, the schematic diagram is shown.

[0041] Figure 17a is the structure schematic diagram of the bone conduction magnetic circuit assembly of some embodiments of the utility model.

[0042] Figure 17b is Figure 17a When the bone conduction magnetic circuit assembly shown in the drawing is integral part, the schematic diagram is shown.

[0043] Figure 18a is the structure schematic diagram of the bone conduction magnetic circuit assembly of some embodiments of the utility model.

[0044] Figure 18b is Figure 18a When the bone conduction magnetic circuit assembly shown in the drawing is integral part, the schematic diagram is shown.

[0045] Figure 19a is the structure schematic diagram of the bone conduction magnetic circuit assembly of some embodiments of the utility model.

[0046] Figure 19b is Figure 19a When the bone conduction magnetic circuit assembly shown in the drawing is integral part, the schematic diagram is shown.

[0047] Figure 20 is Figure 13b The structure schematic diagram of the elastic sheet in the drawing is shown.

[0048] Figure 21a is the cross-sectional view of the bone conduction sound generating device of some embodiments of the utility model.

[0049] Figure 21b is the cross-sectional view of the bone conduction sound generating device of some embodiments of the utility model, the structure of bone conduction magnetic circuit assembly in the drawing is identical with Figure 17a

[0050] Figure 22 is the structure schematic diagram of the air conduction sound generating device of some embodiments of the utility model.

[0051] ​​Figure 23 yes Figure 22 The top view of the air-conducting sound-generating device shown.

[0052] Figure 24 It is along Figure 23 A sectional view obtained by cutting along the MM section line.

[0053] Figure 25 This is a top view of the magnetic support component in some embodiments of this utility model.

[0054] Figure 26 This is a top view of the magnetic support component in some embodiments of this utility model.

[0055] Figure 27 This is a top view of the magnetic support component in some embodiments of this utility model.

[0056] Figure 28 This is a structural schematic diagram of the air-conducting sound-generating device in some embodiments of this utility model.

[0057] Figure 29 yes Figure 28 The diagram shows a cross-sectional view of the air-conducting sound-generating device.

[0058] Figure 30 yes Figure 29 Enlarged view of Part III.

[0059] Figure 31 yes Figure 28 The diagram shows the positions of the magnetic support, main magnet, and main pole core plate of the air-conducting sound-generating device.

[0060] Figure 32 It is along Figure 24 The sectional view obtained by cutting along the JJ section line.

[0061] Figure 33 This is a schematic diagram showing the positions of the magnetically conductive support, secondary magnet, and secondary pole core plate in some embodiments of this utility model.

[0062] Figure 34 This is a schematic diagram showing the positions of the magnetically conductive support, secondary magnet, and secondary pole core plate in some embodiments of this utility model.

[0063] Figure 35 This is a schematic diagram showing the positions of the magnetically conductive support, secondary magnet, and secondary pole core plate in some embodiments of this utility model.

[0064] Figure 36 yes Figure 24 The diagram shows the structure of the air-conducting magnetic circuit assembly of the air-conducting sound-generating device.

[0065] Figure 37 yes Figure 24 Enlarged view of Part II.

[0066] Figure 38 yes Figure 28 An exploded diagram of the diaphragm assembly.

[0067] Figure 39 yes Figure 22 A schematic diagram of the diaphragm assembly in the image.

[0068] Figure 40 yes Figure 22 The diagram shown illustrates the air-conducting sound-generating device when double-sided adhesive is used.

[0069] Figure 41 yes Figure 28 Top view of the diaphragm assembly.

[0070] Figure 42 yes Figure 39 Top view of the diaphragm.

[0071] Figure 43 It is along Figure 42 The cross-sectional view obtained by cutting along the KK section line. Detailed Implementation

[0072] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0073] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0074] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0075] The area of ​​a hole mentioned in this article refers to the size of the area enclosed by the outer contour of the hole.

[0076] Unless otherwise specified, the dimensions or ranges of “length,” “width,” “height,” “thickness,” “wall thickness,” etc. mentioned in this article refer to the dimensions or ranges of the largest part in the corresponding direction.

[0077] This specification describes a head-mounted sound-generating device that can be worn on the human head to enable a person to hear sound, for example, through bone conduction and / or air conduction. The head-mounted sound-generating device includes a sound-generating unit 10 and a wearing mechanism 11 connected to the sound-generating unit 10. The sound-generating unit 10 is used to emit sound, and the wearing mechanism 11 is used to wear the sound-generating unit 10 on the human head so that the sound can be easily heard. For example, the sound-generating unit 10 is worn in a position corresponding to the human ear, for example, directly inserted into the ear or located near the front of the ear.

[0078] In some embodiments, the wearing mechanism 11 may be a loop (e.g., U-shaped) with an opening, which is fitted over the user's head for wearing. In some embodiments, the wearing mechanism 11 may include ear hooks that are curved and can hang above the user's ears. In some embodiments, the wearing mechanism 11 may include structures such as curved back hooks and ear hooks adapted to hook above the human ear, with the back hooks adapted to wrap around the back of the human head. In some embodiments, the wearing mechanism 11 may also be a frame structure, the frame structure including temples located on both sides of the head, with the sound-generating unit 10 connected to the temples.

[0079] In some embodiments, the head-mounted sound device includes a single sound-emitting unit 10, which is worn on the left or right ear. For example, when the head-mounted sound device is a single-ear headphone, it includes only one sound-emitting unit 10 and may also have an ear hook that hooks onto the ear. In other embodiments, the head-mounted sound device includes two sound-emitting units 10, respectively worn on the left and right ears. For example, the head-mounted sound device may be a binaural headphone or glasses, in which case it includes two sound-emitting units. Depending on the product, the head-mounted sound device may also include a back hook and ear hooks or a frame structure.

[0080] The following example uses a binaural headphone as an illustration.

[0081] like Figure 1 As shown, Figure 1The headset shown is a binaural headphone, comprising two sound-generating units 10 (or headphone heads), a back hook 110 adapted to wrap around the back of the head, two ear hooks 111 adapted to hook onto the ears, and two functional compartments for housing a control circuit board and / or a battery. For example, the two functional compartments are a control compartment 112 for housing the control circuit board and a battery compartment 113 for housing the battery; or each functional compartment houses both the control circuit board and / or the battery. The back hook 110 connects between the two functional compartments. The two sound-generating units 10 are respectively assigned to the two functional compartments, and the sound-generating units 10 and their corresponding functional compartments are connected via the ear hooks 111. Specifically, the back hook 110 connects between the control compartment 112 and the battery compartment 113. The control compartment 112 and one of the sound-generating units 10, as well as the battery compartment 113 and the other sound-generating unit 10, are each connected via an ear hook 111. Understandably, the rear hook 110, ear hook 111, and two functional compartments together constitute the headphone wearing mechanism 11.

[0082] It is understandable that although this manual uses binaural headphones as an example, head-mounted sound devices are not limited to binaural headphones. For example, they can also be hearing aids, audio glasses, smart helmets, VR devices, AR devices, and other electronic devices.

[0083] The overall design of the head-mounted sound device is symmetrical to improve wearing comfort. For example... Figure 1 and Figure 2 As shown, the functional compartment has a side surface 1123 facing the human body when the head-mounted sound device is worn, and the sound unit 10 has a contact surface 10010 that contacts the human skin when the head-mounted sound device is worn. The included angle β1 formed between the side surface 1123 and the contact surface 10010 facing the head is an obtuse angle, so that the contact surface 10010 is deflected relative to the side surface 1123 towards the head by a certain angle. Optionally, the included angle β1 is in the range of 160° to 170°.

[0084] It should be noted that when defining the included angle between two surfaces in this article, the surfaces can be either planar or curved. When the surface is planar, the included angle with that surface is the same as the included angle with the plane containing that surface. When the surface is curved, refer to... Figure 3 The most convex or concave point of the arc surface has a tangent plane 10011. The angle between the arc surface and the tangent plane 10011 can be understood as the angle between the arc surface and the tangent plane 10011. For example, when both the contact surface 10010 and the side surface 1123 are planes, the angle β1 is the angle between the two planes. When both the contact surface 10010 and the side surface 1123 are arc surfaces, the angle β1 is the angle between the tangent plane of the contact surface 10010 and the tangent plane of the side surface 1123.

[0085] Next, the sound production unit of the head-mounted sound production device is described.

[0086] The sound production unit 10 comprises a housing assembly 100 and a sound production device arranged inside the housing assembly 100. Optionally, the housing assembly 100 is connected by at least two housing parts. In some embodiments, as shown in Figure 4 , the housing assembly 100 comprises a housing part 1000 with an open end and a face cover 1001 closing the open end of the housing part 1000. The housing part 1000 is integrally formed. The face cover 1001 is arranged to contact the skin of the face when worn. Optionally, a soft layer (not shown) is arranged on the outer side of the face cover 1001 to improve the comfort when contacting the face. The material of the soft layer can be, for example, silicone. It can be understood that the surface of the face cover 1001 for contacting the skin of the face is the contact surface 10010. In other embodiments, as shown in Figure 5 , the housing part 1000 is connected by two parts, comprising a side housing part 1004 and a back cover 1002. The face cover 1001 and the back cover 1002 are arranged opposite to each other and close two open ends of the side housing part 1004, respectively. Optionally, the side housing part 1004 is in the shape of a tube. The side housing part 1004 is not limited to be a single part, for example, it can be connected by two or more parts to be in the shape of a tube. It can be understood that when the housing part 1000 is integrally formed, the back cover 1002 and the side housing part 1004 are integral. The housing part 1000 is not limited to have only one opening. In other embodiments, the housing part 1000 can also have two or more openings, for example, the side housing part 1004 can have a notch and be closed by a cover or other components.

[0087] The sound production unit 10 is connected to the ear hook 111 through the housing assembly 100, for example, the ear hook 111 can be connected to the side housing part 1004.

[0088] The sound production device is used to convert electrical signals into mechanical vibrations. The sound production device can be, for example, a bone conduction sound production device, which converts electrical signals into mechanical vibrations and directly transmits the mechanical vibrations to the skin of the human body through the face cover 1001 in contact with the skin of the face, so that the human being can hear the sound through bone conduction. The sound production device can also be an air conduction sound production device, which forms air conduction sound by exciting air vibration through mechanical vibration. It can be understood that the housing assembly 100 is not limited to have only one or one type of sound production device.

[0089] In some embodiments, as shown in Figure 4 and Figure 5 , the sound production unit 10 is capable of both bone conduction sound transmission and air conduction sound transmission. At this time, the sound production unit 10 is provided with both a bone conduction sound production device 2 and an air conduction sound production device 3. Optionally, the bone conduction sound production device 2 is connected to the face cover 1001 and / or the back cover 1002.

[0090] 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 their disadvantages, such as filtering out the frequency band with the largest 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 combined method to diversify the sound quality and improve the shortcomings of the independent use of a single sound generating unit, thereby improving the listening effect. Hereinafter, the sound generating unit with two sound generating devices 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 applied to the sound generating unit 10 independently.

[0091] Figure 6 to Figure 8a It is a structural schematic diagram of a sound generating unit 10 according to some embodiments of the present specification, 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, and the vibration is transmitted to the face cover 1001 through the shell 1000, and then transmitted to the human body through the face cover 1001. In other embodiments, the bone conduction sound generating device 2 can also be connected with the face cover 1001 and the back cover 1002 at the same time. The shell assembly 100 is provided with a sound outlet hole 1003 for communication between the inside and the outside. The air conduction sound generating device 3 generates sound outward through the sound outlet hole 1003, and 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 at the same time, bone conduction sound transmission and air conduction sound transmission can be realized at the same time, the volume is increased, and the respective advantage frequency bands can be used to achieve better hearing effect.

[0092] In some embodiments, the air conduction sound production device 3 is located on one side of the width direction of the bone conduction sound production device 2, and the air conduction sound production device 3 and the bone conduction sound production device 2 are arranged along the width direction Y of the sound production unit 10, so that the arrangement of the air conduction sound production device 3 and the bone conduction sound production device 2 is more reasonable, the structure is more compact, the space is saved and the weight distribution is optimized, which is beneficial to control the mass and volume of the sound production unit 10 within a smaller range. The sound production unit 10 can have a suitable shape and volume, and will not be too long to cause discomfort when worn, and is beneficial to the air conduction sound production device 3 close to the ear sound production, and at the same time, the bone conduction sound production device 2 is located away from the ear on the side where the head is located. When the angle β1 between the side surface 1123 and the contact surface 10010 formed towards the side where the head is located is 160°-170°, the part corresponding to the bone conduction sound production device 2 of the shell assembly 100 is deflected towards the face, which can better fit the face, thereby promoting the sound transmission efficiency of the bone conduction sound production device 2. The length direction X, the width direction Y and the thickness (or height) direction Z of the sound production unit 10 can refer to the XYZ coordinate system in Figure 6 , and the thickness direction is perpendicular to the contact surface 10010. It can be understood that the length, width and thickness directions of the shell assembly 100 are consistent with the length, width and thickness directions of the sound production unit 10.

[0093] In this specification, the bone conduction sound production device 2 and the air conduction sound production device 3 are introduced as examples of cuboid. It can be understood that the introduction as an example of cuboid does not mean that the bone conduction sound production device 2 and the air conduction sound production device 3 must be cuboid, and the cross-sectional outline can also be a runway shape, a cylindrical shape, an elliptical shape or a polygonal shape.

[0094] Next, the vibration direction of the bone conduction sound production device 2 and the air conduction sound production device 3 and the sound hole are exemplified.

[0095] As shown in Figure 4 , the positive direction of the vibration direction A of the bone conduction sound production device 2 points to the contact surface 10010 between the face cover 1001 and the human body. The positive direction of the vibration direction is the direction pointing to the outside of the shell 1000, and the negative direction is the direction pointing to the inside of the shell 1000, which is opposite to the positive direction. Specifically, Figure 4The positive direction and the negative direction are respectively indicated by "+" and "-". The positive direction of the vibration direction A is upward, and the negative direction is downward. The positive direction of the vibration direction B is leftward, and the negative direction is rightward. Optionally, the angle a1 between the vibration direction A and the contact surface 10010 is 60°-90°. Further optionally, the angle a1 between the vibration direction A and the contact surface 10010 is 75°-90°. Further optionally, the angle a1 between the vibration direction A and the contact surface 10010 is 90°. As described above, when the contact surface 10010 is a plane, the angle a1 between an object (for example, the vibration direction A) and the contact surface 10010 is the angle between the object and the plane on which the contact surface 10010 is located. When the contact surface 10010 is a curved surface, the curved surface has a tangent plane 10011 at the most convex point or the most concave point. At this time, the angle a1 between an object and the contact surface 10010 can be understood as the angle between the vibration direction A and the tangent plane 10011. By setting the angle a1 to be greater than 60°, the component of the vibration in the direction parallel to the human face can be reduced, so that the vibration of the bone conduction sound generation device 2 is better transmitted to the skull, and the loss of vibration is reduced.

[0096] The positive direction of the vibration direction B of the air conduction sound generation device 3 is directed to the side shell part 1004 of the shell 1000. The vibration direction B is not parallel or coincident with the vibration direction A of the bone conduction sound generation device 2, or in other words, the vibration direction B of the air conduction sound generation device 3 and the vibration direction A of the bone conduction sound generation device 2 have an angle other than 0° therebetween. In some embodiments, as shown in Figure 8a and Figure 8c The air conduction sound generation device 3 is arranged to face away from the bone conduction sound generation device 2 (the side on which the diaphragm 321 of the air conduction sound generation device 3 is the front side, and the bottom surface 3b thereof is the back side). At this time, the diaphragm 321 of the air conduction sound generation device 3 is close to the sound outlet hole 1003, which is beneficial to improve the sound transmission efficiency and increase the volume. In other embodiments, as shown in Figure 8b The air conduction sound generation device 3 is arranged to face the bone conduction sound generation device 2. For example, an opening can be arranged on the bottom surface 3b or other parts of the air conduction sound generation device 3, such as a ventilation hole 3c that communicates between the inside and the outside of the air conduction sound generation device 3, to allow sound to be transmitted out.

[0097] It can be understood that the air conduction sound generation device 3 is arranged to face or face away from the bone conduction sound generation device 2, and the thickness direction thereof corresponds to the width direction of the sound generation unit 10, so that the space occupation in the width direction of the sound generation unit 10 can be reduced, which is beneficial to make the sound generation unit 10 not too wide to cause discomfort when worn.

[0098] Reference is made to Figure 4 and Figure 6The side shell part 1004 of the shell 1000 has a proximal end 10040 close to the human ear in the width direction Y of the shell 1000 when the head-mounted sound production device is worn. Obviously, the proximal end 10040 of the side shell part 1004 is also the proximal end 10040 of the shell 1000, the shell assembly 100, and the sound production unit 10. The air conduction sound production device 3 is arranged close to the proximal end 10040 and is arranged to produce sound towards the proximal end 10040 of the side shell part 1004. The sound outlet hole 1003 is arranged on the proximal end 10040. In this way, the air conduction sound production device 3 can be close to the human ear and produce sound towards the human ear, which helps to improve the directness and clarity of the sound, reduces the loss and distortion of the sound, and enables the human to hear more air conduction sound, which is more efficient and better. In addition, the volume of the air conduction sound production device 3 can be appropriately reduced, which is beneficial to miniaturization. In addition, the bone conduction sound production device 2 is far away from the sound outlet hole 1003, which can reduce the interference of the internal sound wave of the bone conduction sound production device 2 when vibrating from the sound outlet hole. As shown in Figure 1 , the proximal end 10040 is also the end of the side shell part 1004 close to the functional compartment. The sound outlet hole 1003 is arranged on the end surface of the side shell part 1004 of the shell assembly 100 towards the functional compartment.

[0099] In some embodiments, referring to Figure 9 , the included angle a2 between the vibration direction B of the air conduction sound production device 3 and the contact surface 10010 is 0-45°. By setting the included angle a2 between the vibration direction B of the air conduction sound production device 3 and the contact surface 10010 to 0-45°, the sound produced by the air conduction sound production device 3 can be better directed to the ear canal, improving the propagation efficiency of the sound, while reducing the leakage of sound. Further optionally, the included angle a2 is 0-30°, and further optionally, the included angle a2 is 0-15°, so that the sound produced by the air conduction sound production device 3 can be more accurately directed to the ear canal. When the included angle a2 is greater than 0°, the positive direction of the vibration direction B of the air conduction sound production device 3 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 away from the bone conduction sound production device 2. Optionally, when the head-mounted sound production device is worn, the positive direction of the vibration direction B points to the inside of the auricle, thereby improving the sound gathering effect of the auricle and reducing the leakage of sound.

[0100] It can be understood that the angle between the bone conduction sound production device 2 and the air conduction sound production device 3 can be adjusted in various ways, Figure 9In the shown embodiment, the two are connected to the face cover 1001 and the side shell part 1004 respectively through one connecting part 12 each, and the surface connected to the sound production device of the connecting part 12 is inclined, so that the bone conduction sound production device 2 and the air conduction sound production device 3 are also inclined after installation. In other embodiments, the connecting part 12 can not be provided, and inclined surfaces are provided on the face cover 1001 and the side shell part 1004, and the bone conduction sound production device 2 and the air conduction sound production device 3 are respectively installed on the corresponding inclined surfaces to adjust the angle.

[0101] In some embodiments, the angle a3 between the axis direction C of the sound outlet hole 1003 and the contact surface 10010 is 0-45°, so that the sound range emitted thereby can be reliably transmitted to the ear, and further optionally, the angle a3 is 0-30°, and further optionally, the angle a3 is 0-15°, which can further increase the sound transmitted to the ear. Optionally, when the angle a3 is greater than 0°, the positive direction of the axis direction C of the sound outlet hole 1003 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 to the inside of the auricle, so as to improve the listening effect by using the sound gathering effect of the auricle, and to reduce the leakage.

[0102] It can be understood that the angle between the vibration direction or the axis direction (or other) and the contact surface 10010 (or other surface) is 0-N°, which means that the angle can be 0°, i.e. parallel to the contact surface 10010, or greater than 0°, i.e. inclined to the contact surface 10010, but the inclination angle is not greater than N°, for example, the angle 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 angle not exceeding 45°.

[0103] In some embodiments, the axis direction C of the sound outlet hole 1003 is consistent with the vibration direction B of the air conduction sound production device 3, that is, the axis direction C can be parallel or coincident with the vibration direction B, at this time, the axis direction C and the vibration direction B have the same angle with the contact surface 10010, which can further improve the efficiency of sound propagation. In some embodiments, the axis direction C of the sound outlet hole 1003 is parallel to the contact surface 10010, and the vibration direction B of the air conduction sound production device 3 is not parallel to the contact surface 10010. In some embodiments, the angle a3 is greater than the angle a2, and the smaller the angle a2, the more perpendicular it is to the depth direction of the shell 1000 and the face cover 1001, which is more conducive to utilizing the space inside the shell assembly 100, preventing the space from becoming larger due to the inclined arrangement of the air conduction sound production device 3 and the bone conduction sound production device 2, in addition, the smaller angle a2 can make the center of the diaphragm closer to the sound outlet hole 1003. The sound wave propagation path is shorter, which can improve the sound pressure level received by the human ear, and the air conduction sound production device 3 can output greater volume under the same power. Therefore, the angle a3 is greater than the angle a2, which is conducive to the miniaturization of the sound production unit, or in the case of the same volume, increasing the volume of the bone conduction sound production device 2 and / or the air conduction sound production device 3, thereby improving the sound production effect. Optionally, the vibration direction A is perpendicular to the contact surface 10010, and the vibration direction B is parallel to the contact surface 10010, and the air conduction sound production device 3 adjusts the direction of the sound emitted from the sound outlet hole 1003 through the sound outlet hole 1003.

[0104] It can be understood that the axis direction C of the sound outlet hole 1003 can be adjusted in various ways, for example, Figure 9 In the illustrated embodiment, the sound outlet hole 1003 is inclinedly arranged on the side shell part 1004, and the axis direction C of the sound outlet hole 1003 is changed by the inclination of the side shell part 1004 relative to the contact surface 10010, and the sound outlet hole 1003 is vertically arranged on the side shell part 1004. The axis direction C of the sound outlet hole 1003 is changed by the inclination of the side shell part 1004 relative to the contact surface 10010.

[0105] The number of sound outlet holes 1003 can be one or more, for example, one, two, three or more. In some embodiments, at least one sound outlet hole 1003 is located at the geometric center O1 of the projection of the outer contour of the inner wall of the side shell part 1004 along the vibration direction B on a plane perpendicular to the vibration direction B, and the geometric center O2 of the projection of the diaphragm 321 of the air conduction sound production device 3 along the vibration direction B on the same plane. In some embodiments, the number of sound outlet holes 1003 is one, and the geometric center O1 of the projection of the outer contour of the inner wall of the side shell part 1004 along the vibration direction B and the geometric center O2 of the projection of the diaphragm 321 of the air conduction sound production device 3 along the vibration direction B do not coincide, Figure 10 Figure 10 ​The outer contour of the diaphragm 321 is shown by the dashed line. When the sound hole 1003 is concentric with the diaphragm 321, it can exacerbate the resonance effect. The concentricity of the sound hole 1003 and the diaphragm 321 can cause resonance in the acoustic cavity, especially at higher frequencies. This can result in resonance peaks and attenuation valleys at some frequencies, affecting the naturalness and quality of the sound. By setting the sound hole 1003 to be offset relative to the diaphragm 321, for example, at the edge of the diaphragm 321 or other positions, this situation can be avoided or mitigated, maintaining the normal vibration of the diaphragm 321 and improving the accuracy and clarity of the sound.

[0106] Optionally, the geometric center O1 of the sound hole 1003 is offset relative to the geometric center O2 towards the ear canal, so as to be closer to the ear canal, which is beneficial to improve loudness and reduce sound diffusion to the space outside the head, thereby reducing sound leakage. Referring back to Figure 10 In some embodiments, the geometric center O1 of the sound hole 1003 is offset relative to the geometric center O2 towards the side closer to the face cover 1001 to be closer to the ear canal. In some embodiments, the geometric center O1 of the sound hole 1003 is offset relative to the geometric center O2 towards the connection 111a between the shell assembly 100 and the ear hook 111, so that the sound hole 1003 is closer to the ear canal. In other embodiments, the geometric center O2 of the diaphragm 321 is offset towards both the face cover 1001 and the connection 111a. Optionally, the distance D8 between the geometric center O2 of the diaphragm 321 and the geometric center O1 of the sound hole 1003 is 0.1-8mm to obtain a better sound emission effect and ensure the structural strength of the shell. The distance D8 between the geometric center O2 of the diaphragm 321 and the geometric center O1 of the sound hole 1003 is further optionally 1-4mm to further ensure the effect.

[0107] The number of sound holes 1003 can be one or more. In some embodiments, the total area of all sound holes 1003 is 10-130mm 2 A large total area of the sound holes 1003 can allow the sound emitted by the diaphragm 321 to be better propagated, and can also shift the high-frequency cutoff frequency of the air-conduction sound emitting device 3 to the rear, improving the sensitivity of the medium and high frequencies. When the sound hole 1003 is greater than 130mm 2 , further increasing the area of the sound hole 1003 has little effect on the shift of the high-frequency cutoff frequency, and a sound hole 1003 that is too large can easily lead to insufficient shell strength. Therefore, the area of the sound hole 1003 can be optionally 10-130mm 2 .

[0108] Figure 11The frequency response curve of the sound production unit with different areas of the sound hole 1003 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 the area of the sound hole 1003. As can be seen from the figure, as the area of the sound hole 1003 increases, the high-frequency cutoff frequency also increases, the frequency band before the high-frequency cutoff frequency is also more flat, and the frequency response of the frequency band after the high-frequency cutoff frequency also becomes smaller. Thus, the frequency width of the frequency response curve of the entire device is also wider. The frequency width refers to the difference between the frequency value corresponding to the high-frequency cutoff frequency and the frequency value corresponding to the resonance peak at F0. Generally speaking, the wider the frequency width, the better the sound quality, which can also effectively improve the sensitivity of the middle and high frequency bands and increase the volume of the air conduction. Because the frequency width is wider, the sound details at high frequencies are more delicate, for example, when playing music symphony or high-fidelity vocal music, the high-pitched part of the violin and piano can be clearly distinguished by the human ear, and the breathing or unique voice details of the human voice singing can also be presented. At the same time, because the sound restoration degree is high and clear, the distortion is also greatly reduced. The overall subjective listening will make the tone more rich and warm, which is very helpful to improve the overall sound quality. Therefore, the area of the sound hole 1003 is set to 10-130mm 2 , which is beneficial to make the air conduction sound production device 3 have a better frequency response curve and improve the sound production effect. Further optionally, the total area of all sound holes 1003 is 40-100mm 2 , which further ensures the structural strength of the shell on the basis of ensuring the sensitivity of the middle and high frequency bands.

[0109] Optionally, the number of sound holes 1003 is one, which reduces the obstruction of the solid part between multiple sound holes 1003 to sound waves, so that the sound can be more efficiently transmitted out.

[0110] Optionally, at least one sound hole 1003 is in a strip shape and is arranged along a direction parallel to the contact surface 10010 or has an included angle with the parallel direction of not more than 15°, which can reduce the diffusion of sound to the outside of the head, thereby reducing the sound leakage. At the same time, the length direction of the air conduction sound production device 3 is arranged along the length direction X of the sound production unit 10, so that the extension direction of the sound hole 1003 is close to or consistent with the length direction of the diaphragm 321, which is beneficial to the propagation of sound waves. Further optionally, the width W4 of the sound hole 1003 is 0.8-8mm and the length L11 is 3-15mm. Further optionally, two or more sound holes 1003 are arranged along the length direction of the sound hole 1003 to further reduce sound leakage and improve sound propagation efficiency.

[0111] In the embodiments described in the specification, the thickness direction of the bone conduction sound production device 2 is consistent with the vibration direction A thereof, and the thickness direction of the air conduction sound production device 3 is consistent with the vibration direction B thereof.

[0112] Next, the connection structure of the air-conduction sound production device 3 and the shell assembly 100 and the related features of the front cavity are described.

[0113] 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 thus 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, which can be provided on the magnetic conductive bottom plate 3100 and / or the magnetic conductive side plate 3101 of the magnetic conductive support 310, Figure 8a The case where the air hole 3c is provided on the magnetic conductive bottom plate 3100 is shown. In some cases, sound can be emitted outward through the air hole 3c, for example, referring to Figure 8b When the bottom surface 3b of the air-conduction sound production device 3 is arranged towards the sound hole 1003, sound can be emitted outward through the air hole 3c.

[0114] 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 thus make the air-conduction sound production device 3 be able to increase the volume without increasing the thickness too much, ensure the sound production effect, and also make the diaphragm 321 have a larger area, thereby being beneficial to increasing the volume and strengthening the low-frequency effect.

[0115] Figure 12Fig. 6 shows the frequency response curves of the sound production unit 10 corresponding to different volumes of the front cavity obtained by simulation. In the simulation, the air conduction sound production device 3 produces sound, the bone conduction sound production device 2 does not produce sound, and other parameters remain unchanged except for the volume of the front cavity 10042. As can be seen from the figure, as the volume of the front cavity decreases, the high-frequency cutoff frequency becomes larger, the curve between the high-frequency resonance peak and the low-frequency resonance peak is flatter, and the sound pressure level after the high-frequency resonance peak decays less. The volume of the front cavity 10042 refers to the volume of the space enclosed between the diaphragm assembly 32 and the sound hole 1003. Optionally, the volume of the front cavity 10042 is 10-250mm 3 A smaller front cavity 10042 helps to extend the resonance frequency of the front cavity to high frequencies, prevent the high-frequency cutoff frequency from being too early, cause low high-frequency sensitivity, and thus improve the sound production effect. However, the front cavity 10042 that is too small will affect the normal operation of the diaphragm 321, for example, it can cause the diaphragm 321 to contact the shell and produce noise. In order to provide sufficient vibration space for the diaphragm 321 while ensuring that the high-frequency cutoff frequency is late, the volume of the front cavity 10042 is further optionally 50-200mm 3 and more further optionally 70-180mm 3 to make the volume of the front cavity 10042 more appropriate, not occupy too much space, and also help to ensure the structural strength of the shell.

[0116] In some embodiments, the bone conduction sound production device 2 and the air conduction sound production device 3 are located in the same cavity of the shell assembly 100. On the one hand, it can make the shell assembly 100 have a larger rear cavity 10044, reduce the F0 of the air conduction sound production device 3, and improve the low-frequency effect. On the other hand, it can effectively utilize the internal space of the shell assembly 100 and reasonably arrange the space arrangement of the two sound production devices in the earphone head. Compared with separating the two bone conduction sound production devices 2 and the air conduction sound production device 3 by a partition, it is beneficial to make the entire earphone head smaller and more compact. At the same time, because the volume of the earphone head is reduced, the volume of the shell is also reduced, which can reduce the weight of the entire earphone head and reduce the feeling of weight when wearing. The reduction in weight is also beneficial to improve the frequency response of the high-frequency band of the bone conduction sound production part and improve the sound quality of the high-frequency band. In some embodiments, the volume of the shell assembly 100 is 20-60mm Figure 8aThe shell 1000 is provided with a through hole 10000 for communication between the inside and outside of the shell 1000. 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 part 1004. The through hole 10000 is in communication with the rear cavity 10044, which is advantageous for increasing the rear cavity 10044 of the air conduction sound generating device 3, thereby reducing F0 and improving low-frequency sensitivity. In other embodiments, the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be respectively arranged in two independent cavities, for example, separated by a partition, to reduce mutual interference during operation. Optionally, the cavity in which the air conduction sound generating device 3 is arranged is provided with a through hole 10000 in communication with the outside. The parameters of the through hole 10000 can be referred to the above. Alternatively, the cavity in which the bone conduction sound generating device 2 is arranged is provided with a through hole 10000, and the partition is provided with a hole channel for communication between the two cavities.

[0117] The air conduction sound generating device 3 is fixedly connected with the shell assembly 100. In some embodiments, the air conduction sound generating device 3 is connected with the inner wall of the side shell part 1004, for example, through the diaphragm 321, the air conduction support 30, the magnetically conductive side plate 3101 and / or the magnetically conductive bottom plate 3100 (see the reference numerals in Figure 24 and Figure 29 ) and the like. In other embodiments, in order to further reduce the occupation of the air conduction sound generating device 3 to the internal space of the shell assembly 100, the air conduction sound generating device 3 can be embedded in the side shell part 1004 to reduce the occupation of the air conduction sound generating device 3 to the internal space of the shell assembly 100, thereby being advantageous for miniaturization of the sound generating unit 10, and further improving the firmness of the connection between the air conduction sound generating device 3 and the side shell part 1004. The air conduction sound generating device 3 is at least partially embedded in the side shell part 1004, for example, referring to Figure 6 and Figure 7 , the inner wall of the side shell part 1004 is provided with a mounting groove 10041, and the air conduction sound generating device 3 is arranged in the mounting groove 10041. In the illustrated embodiment, the air conduction sound generating device 3 is partially located in the mounting groove 10041. In other embodiments, the air conduction sound generating device 3 can also be completely located in the mounting groove 10041. The mounting groove 10041 not only saves the space occupied by the air conduction sound generating device 3, but also plays a role in positioning the air conduction sound generating device 3. Compared with the scheme of attaching it to the inner wall of the side shell part 1004, it is not necessary to additionally provide a limiting structure. Further, the mounting groove 10041 makes the contact area between the air conduction sound generating device 3 and the shell assembly 100 relatively larger, and further increases the firmness of the installation of the air conduction sound generating device 3. Optionally, the depth D14 of the mounting groove 10041 is 0.3-1.5 mm, and the air conduction sound generating device 3 has sufficient embedding depth, thereby increasing the reliability of positioning and connection. At the same time, the wall thickness of the part of the side shell part 1004 for mounting the air conduction sound generating device 3 is not too thick, which is advantageous for reducing the mass of the sound generating unit 10.

[0118] 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, so that the air conduction sound production device 3 can be directly mounted downward from the end surface 1000a, the installation is more convenient, and the space in the thickness direction of the sound production unit 10 can be more fully utilized, which is beneficial to increase the volume of the air conduction sound production device 3 and the effective radiation area of the diaphragm 321, or to reduce the volume of the sound production unit 10. Figure 7 In the illustrated embodiment, the mounting groove 10041 is not communicated to the back cover 1002, and the other side of the mounting groove 10041 is spaced from the back cover 1002. Further optionally, in other embodiments, the mounting groove 10041 is communicated to the back cover 1002, 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 conduction sound production device 3 available in the thickness direction of the sound production unit 10.

[0119] The air conduction 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 conduction sound production device 3 is connected to two or all of the mounting groove 10041, the back cover 1002 and the face cover 1001, the connection can be further ensured to be firm, and the reliability of the air conduction sound production device 3 in operation can be ensured. Optionally, the air conduction 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. For example, referring to Figure 8a , the outer edge (for example, the outer ring piece 3210 mentioned below) of the diaphragm 321 of the air conduction sound production device 3 is adhesively connected to the groove bottom surface 10043. In other embodiments, the air conduction sound production device 3 further includes a gland 33 connected to the diaphragm 321, and the gland 33 can be adhesively connected to the groove bottom surface 10043. In other embodiments, the air conduction sound production device 3 can also be adhesively connected to the groove bottom surface 10043 through the magnetic conductive bottom plate 3100 thereof. The air conduction sound production device 3 can also be adhesively connected to the side wall of the mounting groove 10041 and the face cover 1001 by glue, so as to improve the firmness of the connection. 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 shell 1000 facing the face cover 1001, so as to facilitate the installation of the face cover 1001 and the adhesion of the face cover 1001. Optionally, the air conduction sound production device 3 can also be adhesively connected to the back cover 1002. In some embodiments, a cavity can also be provided on the face cover 1001, and the air conduction sound production device 3 extends beyond the end surface 1000a into the cavity, so as to increase the volume of the air conduction sound production device 3 and improve the space utilization.

[0120] For example, referring to Figure 7 and Figure 8aThe side shell part 1004 of the shell 1000 is provided with the front cavity 10042, which is in communication with the mounting groove 10041 and the sound outlet hole 1003. The front cavity 10042 is arranged in correspondence with 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 necessarily required. For example, the mounting groove 10041 can be omitted, and the front cavity 10042 can be directly formed on the inner wall of the side shell part 1004 and in communication with the sound outlet hole 1003. The air conduction sound production device 3 is directly connected to the inner wall of the side shell part 1004.

[0121] Next, the bone conduction sound production device 2 of the sound production unit 10 will be described.

[0122] First of all, it should be noted that the bone conduction sound production device 2 and the air conduction sound production device 3 include similar components, such as a support, a magnetic circuit assembly and a coil. In order to facilitate 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. 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.

[0123] Figure 13a FIG. 2 is a structural schematic diagram of the bone conduction sound production device 2 according to some embodiments of the present specification, Figure 13b FIG. 3 is a cross-sectional schematic diagram of the bone conduction sound production device 2 shown in FIG. 2, Figure 13a FIG. 3 is a cross-sectional schematic diagram of the bone conduction sound production device 2 shown in FIG. 2, Figure 14is 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.

[0124] 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 15 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.

[0125] 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.

[0126] Figure 13b 、 Figure 16a 、 Figure 17a 、 Figure 18a 、 Figure 19a 、 Figure 21a and Figure 21b shows a structural schematic diagram of the bone conduction magnetic circuit assembly 21 according to some embodiments of the present specification.

[0127] Figure 13b 、 Figure 16a and Figure 21a In the embodiments shown in Figure 13b 、 Figure 16a and Figure 21a The difference between the structures shown in Figure 13b The magnetic conductive plate 211 shown is provided with a boss 2113 and a recess 2114, Figure 16a The magnetic conductive plate 211 shown is provided with a boss 2113 and is not provided with a recess 2114, Figure 21a and Figure 21b The gasket 26 is connected to the magnetic conductive plate 211, Figure 21a and Figure 21b The difference between the structures shown in

[0128] 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.

[0129] Figure 18a In the illustrated embodiment, the bone conduction magnetic circuit assembly 21 includes three magnets 210 and two magnetic conductive plates 211 arranged along the vibration direction A, and one magnetic conductive plate 211 is connected between two adjacent magnets 210. The two adjacent magnets 210 are arranged with the same polarity. The outer part of the magnetic conductive plate 211 between the two adjacent magnets 210 is surrounded by the bone conduction coil 22. Compared with the single magnet structure, the three-magnet structure can increase the sensitivity.

[0130] Figure 19a In the illustrated embodiment, the bone conduction magnetic circuit assembly 21 includes three magnets 210 and two magnetic conductive plates 211 arranged along the vibration direction A, and one magnetic conductive plate 211 is connected between two adjacent magnets 210. The two adjacent magnets 210 are arranged with the same polarity. The outer part of the magnetic conductive plate 211 between the two adjacent magnets 210 is surrounded by the bone conduction coil 22. Compared with the single magnet structure, the three-magnet structure can increase the sensitivity.

[0131] 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.

[0132] The above-mentioned bone conduction magnetic circuit assembly 21 can be installed in the bone conduction sound generating device 2 and assembled into the sound generating unit 10, for example, Figure 14 and Figure 8c that is, respectively shows the application of the bone conduction magnetic circuit assembly 21 to the bone conduction sound generating device 2 and the sound generating unit 10. Figure 17a The bone conduction magnetic circuit assembly 21 shown in the figure is applied to the bone conduction sound generating device 2 and the sound generating unit 10.

[0133] The number of elastic sheets 23 can be one, two or more. In some embodiments, as shown in the figure, Figure 13a and Figure 13bAs shown, the bone conduction sound device 2 includes two elastic sheets 23, which are arranged at intervals along the vibration direction A. Optionally, the two elastic sheets 23 are arranged at the two ends of the bone conduction magnetic circuit assembly 21 along the vibration direction A, which can improve the stability of vibration and help prevent the bone conduction magnetic circuit assembly 21 from swinging (or rolling) during vibration, thereby reducing the risk of impacting the side components. The elastic sheet 23 is in the shape of a sheet as a whole, and the thickness B2 thereof is 0.1 mm to 0.25 mm, and further optionally 0.13 mm to 0.2 mm. Referring to Figure 20 , the elastic sheet 23 includes an outer frame 230, an inner frame 231 located inside the outer frame 230, and at least two elastic arms 232 connected between the outer frame 230 and the inner frame 231. The outer frame 230 is connected to the bone conduction support 20, and optionally, the elastic sheet 23 is attached to the end face 202 of the bone conduction support 20. The outer frame 230 and the bone conduction support 20 can be connected by means of gluing or welding, and the like. Exemplarily, the outer frame 230 and the end face 202 are connected by welding, and the bonding strength of welding is better than that of gluing, which makes the elastic coefficient of the elastic sheet 23 more stable and helps the stability of the low frequency F0 of the bone conduction sound device 2. The welding method can be spot welding or line welding, and line welding is preferred, which can reduce welding slag, thereby preventing the welding slag from entering the product and generating noise, and the welding strength is stronger than that of spot welding or gluing, which helps to enhance the reliability.

[0134] It can be understood that the bone conduction magnetic circuit assembly 21 can be connected by multiple parts (split type), and when the structure can be realized, it can also be formed by one-piece magnetization. When connected by multiple parts, the magnet 210 and the magnetic conducting plate 211 are independent parts, and each independent part is connected to form the bone conduction magnetic circuit assembly 21 by gluing or other means. When the bone conduction magnetic circuit assembly 21 is made by one-piece magnetization, the bone conduction magnetic circuit assembly 21 is a single part (one-piece), and the magnet 210 and the magnetic conducting plate 211 are part of the part, without the need for connection process to form the bone conduction magnetic circuit assembly 21, therefore, the bone conduction magnetic circuit assembly 21 formed by one-piece magnetization generally has higher dimensional accuracy. It should be noted that the bone conduction magnetic circuit assembly 21 is one-piece, which means that at least the whole of the magnet 210 and the magnetic conducting plate 211 is a one-piece single part, and the spacer for connecting the bone conduction magnetic circuit assembly 21 and the elastic sheet 23 can be an independent part or one-piece. For example, Figure 16b 、 Figure 17b 、 Figure 18b and Figure 19b respectively show the connection of the bone conduction magnetic circuit assembly 21 and the elastic sheet 23 by means of Figure 16a 、 Figure 17a 、 Figure 18a and Figure 19aThe schematic diagram of the integrated bone conduction magnetic circuit assembly corresponding to the split bone conduction magnetic circuit assembly shown in the figure, in which the boundary between the two independent parts is shown in solid lines, and the boundary between different parts (magnetic plate 211 and magnet 210) in the integrated part is shown in dashed lines, Figure 17b and Figure 19b The spacer (pad 26) in Figure 16b and Figure 18b The spacer (boss 2113) in the bone conduction magnetic circuit assembly is integrated. The integrated magnetization method can refer to the patent document with application number 202111062238.3, the entire contents of which are incorporated herein by reference.

[0135] Next, the air conduction sound production device 3 of the sound production unit 10 will be described.

[0136] In some embodiments, as shown in Figure 22 to Figure 24 , Figure 28 to Figure 31 The air conduction sound production device 3 includes an annular air conduction support 30, and an air conduction magnetic circuit assembly 31 and a diaphragm assembly 32 connected to the air conduction support 30. The air conduction support 30 can be made of lightweight materials such as plastic to reduce the mass and density of the air conduction sound production device 3. Optionally, the air conduction support 30 is non-magnetic. The diaphragm assembly 32 includes an air conduction coil 320 located in the magnetic field of the air conduction magnetic circuit assembly 31 and a diaphragm 321 connected between the air conduction coil 320 and the air conduction support 30. When alternating current is passed through the air conduction coil 320, it will generate an interaction force with the magnetic field of the air conduction magnetic circuit assembly 31, thereby driving the diaphragm 321 to vibrate.

[0137] Next, the air conduction magnetic circuit assembly 31 of the air conduction sound production device 3 will be described first.

[0138] The air conduction magnetic circuit assembly 31 includes at least a magnetic conduction support 310 connected to the bottom of the air conduction support 30, a main magnet 311 disposed on the surface of the magnetic conduction support 310 facing the diaphragm assembly 32, and a main pole core plate 313 connected to the main magnet 311.

[0139] The magnetic conduction support 310 is made of magnetic conduction material and includes a plate-shaped magnetic conduction bottom plate 3100. Optionally, the thickness of the magnetic conduction bottom plate 3100 is 0.3-0.6mm, so that it has good magnetic conduction effect and is beneficial to prevent magnetic leakage. In some embodiments, referring to Figure 24 and Figure 29The magnetic conductive support 310 further comprises a magnetic conductive side plate 3101 protruding from the side edges of the magnetic conductive bottom plate 3100 towards the diaphragm assembly 32, and extending at least partially to be opposite to the main pole core plate 313 with a gap therebetween, thereby forming the air magnetic gap 315. Optionally, the magnetic conductive bottom plate 3100 is in a rectangular shape, and the magnetic conductive side plate 3101 can be arranged at only two opposite side edges of the magnetic conductive bottom plate 3100, or at all four side edges of the magnetic conductive bottom plate 3100, or a magnetic conductive ring 3102 can be arranged on the magnetic conductive bottom plate 3100. Figure 25 to Figure 27 Fig. 3 is a top view of the magnetic conductive support 319 according to some embodiments of the present application, so as to show the positions and numbers of the magnetic conductive side plates 3101. Figure 25 In the shown embodiment, one magnetic conductive side plate 3101 is arranged at each of the two short edges of the magnetic conductive bottom plate 3100, Figure 26 In the shown embodiment, one magnetic conductive side plate 3101 is arranged at each of the two long edges of the magnetic conductive bottom plate 3100, Figure 27 In the shown embodiment, one magnetic conductive side plate 3101 is arranged at each of the four side edges of the magnetic conductive bottom plate 3100. It can be understood that the magnetic conductive side plates 3101 can be connected to form a ring, and in some embodiments, as shown in Figure 28 to Figure 31 Figure 29 Figure 28 Fig. 4 is a sectional view of the air magnetic sound generating device 2, Figure 30 Figure 29 Fig. 5 is an enlarged view of the III part in Fig. 4, Figure 31 Figure 28 Fig. 6 is a perspective view of the magnetic conductive support 310, the main magnet 311 and the main pole core plate 313 in Fig. 4. The magnetic conductive support 310 comprises a magnetic conductive bottom plate 3100 and a magnetic conductive ring 3102 protruding from the side edges of the magnetic conductive bottom plate 3100 towards the diaphragm assembly 32, and the magnetic conductive ring 3102 is connected by four magnetic conductive side plates 3101. The magnetic conductive ring 3102 surrounds the outside of the main pole core plate 313 to form the air magnetic gap 315, and the air magnetic coil 320 extends into the air magnetic gap 315.

[0140] In some embodiments, reference can be made to Figure 32 Figure 32 Fig. 7 is a sectional view along the line VII-VII in Fig. 4, Figure 24 ​​​​​Figure 7 is a sectional view of the air-guided magnetic circuit assembly 31 taken along the section line J-J. The air-guided magnetic circuit assembly 31 further comprises a plurality of auxiliary magnets 312 connected to the magnetic bottom plate 3100 to increase the BL value of the air-guided coil 320. The number of the auxiliary magnets 312 can be one or more. Optionally, the number of the auxiliary magnets 312 is even, and the opposite two auxiliary magnets 312 are respectively located on the two sides of the main magnet 311. In some embodiments, the air-guided magnetic circuit assembly 31 further comprises a plurality of auxiliary pole plates 314 connected to the auxiliary magnets 312. Optionally, at least one auxiliary pole plate 314 is connected to the surface of each auxiliary magnet 312 facing the diaphragm assembly 32 to improve the magnetic guiding effect. The auxiliary pole plates 314 and the main pole plate 313 are at least partially opposite to each other, and the air-guided magnetic gap 315 is formed between the auxiliary pole plates 314 and the main pole plate 313. Optionally, the distance between each auxiliary magnet 312 and the main magnet 311 is the same. Further optionally, the distance between each auxiliary pole plate 314 and the main pole 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 33 to Figure 35 Figure 8 is a top view of the air-guided magnetic circuit assembly 31 to show the positions and numbers of the auxiliary pole plates 314 and the auxiliary magnets 312. Figure 33 In the shown embodiment, one auxiliary magnet 312 and one auxiliary pole plate 314 are respectively arranged at the two short sides of the magnetic bottom plate 3100. Figure 34 In the shown embodiment, one auxiliary magnet 312 and one auxiliary pole plate 314 are respectively arranged at the two long sides of the magnetic bottom plate 3100. Figure 35 In the shown embodiment, one auxiliary magnet 312 and one auxiliary pole plate 314 are respectively arranged at the four sides of the magnetic bottom plate 3100. Optionally, the two ends of the auxiliary pole plate 314 in the length direction exceed the two ends of the auxiliary magnet 312 in the length direction to further improve the magnetic guiding effect. The distance L9 between the auxiliary pole plate 314 and the auxiliary magnet 312 in the length direction can be 0.03-0.2 mm. Optionally, the distance between the two ends of the auxiliary pole plate 314 in the length direction and the two ends of the auxiliary magnet 312 is the same.

[0141] The magnetic poles of the main magnet 311 are arranged along the vibration direction B of the air-guided sound production device 3, and the magnetic poles of the auxiliary magnet 312 are also arranged along the vibration direction B and opposite to the arrangement direction of the magnetic poles of the main magnet 311. It can be understood that the vibration direction B of the air-guided sound production device 3 is consistent with the vibration direction of the diaphragm 321. The arrangement of the auxiliary magnet 312 can enhance the magnetic field strength and increase the BL value, thereby improving the sensitivity of the air-guided sound production device 3. The auxiliary pole plate 314 can guide the magnetic induction lines, and the main pole plate 313 cooperates with the auxiliary pole plate 314 to make the magnetic induction lines of the main magnet 311 and the auxiliary magnet 312 more concentrated through the air-guided coil 320 of the diaphragm assembly 32, thereby improving the driving force and the sensitivity.

[0142] It can be understood that the outer side of the auxiliary magnet 312 can be provided with the magnetic conduction side plate 3101 or not. Optionally, when the auxiliary magnet 312 is provided on one side of the main magnet 311, the side is no longer provided with the magnetic conduction side plate 3101, so as to reduce the mass and the volume. In some embodiments, as shown in Figure 36 , Figure 36 It is shown that Figure 22 The structure diagram of the air conduction magnetic circuit assembly 31 of the air conduction sound production device 3 is shown. The magnetic conduction bottom plate 3100 is provided with the magnetic conduction side plate 3101 at both short edges, and is not provided with the magnetic conduction side plate 3101 at the long edge. The auxiliary magnet 312 is correspondingly provided at the long edge of the magnetic conduction bottom plate 3100. Optionally, the distance between the magnetic conduction side plate 3101 and the main pole core plate 313 is the same as the distance between the auxiliary pole core plate 314 and the main pole core plate 313, so that the width of the air conduction gap 315 around the main magnet 311 is consistent, and the vibration is more balanced.

[0143] Next, the diaphragm assembly 32 of the air conduction sound production device 3 is exemplified.

[0144] As shown in Figure 30 , Figure 37 , Figure 38 and Figure 39 , the diaphragm 321 includes an outer ring sheet 3210 connected with the air conduction support 30, a middle sheet body 3211 in a flat sheet shape located in the outer ring sheet 3210, and a folded ring part 3212 located between the outer ring sheet 3210 and the middle sheet body 3211, which encloses the area between the outer ring sheet 3210 and the middle sheet body 3211. The outer ring sheet 3210 can be directly or indirectly connected with the air conduction support 30, and the two are relatively fixed. The cross section of the folded ring part 3212 is arc-shaped, which can be recessed towards the side where the air conduction magnetic circuit assembly 31 is located (see Figure 37 and Figure 39 ), or can be convex in the direction away from the side where the air conduction magnetic circuit assembly 31 is located (see Figure 30 and Figure 38 ). Optionally, the outer ring sheet 3210 is connected to the end surface 300 of the air conduction support 30, for example, can be connected by gluing (such as glue coating or double-sided tape connection).

[0145] One end of the air conduction coil 320 is connected with the middle sheet body 3211 of the diaphragm 321, and the other end extends into the air conduction magnetic gap 315, which surrounds the outside of the main pole core plate 313 and is located inside the magnetic conduction side plate 3101. The main pole core plate 313 and the magnetic conduction side plate 3101 can guide and converge the magnetic induction lines, so that the magnetic induction lines pass through the coil more concentratedly and uniformly, thereby improving the sensitivity and driving force. When the air conduction coil 320 is connected with alternating current, it will reciprocate under the interaction with the magnetic field, thereby driving the diaphragm 321 to vibrate, and the diaphragm 321 pushes the air to vibrate and produce sound.

[0146] Optionally, as shown in Figure 30 and Figure 37 The distance L6 between the intermediate sheet 3211 and the main core plate 313 is 0.4-0.8 mm, and the distance L7 between the air guide coil 320 and the magnetic bottom plate 3100 is 0.4-0.8 mm, and both the distance L6 and the distance L7 are greater than the maximum amplitude of the diaphragm 321 when the air guide sound production device 3 is working, which can avoid the collision between the diaphragm 321 and the main core plate 313 and the collision between the air guide coil 320 and the magnetic bottom plate 3100 when the air guide sound production device 3 is working, thereby reducing sound distortion and noise, and prolonging the service life of the air guide sound production device 3. The maximum amplitude refers to the maximum vibration amplitude of the diaphragm 321 on one side in the frequency range of 20 Hz-20 KHz when a 0.5 Vrms voltage is input to the air guide sound production device 3. Optionally, the ratio of the distance L6 and the distance L7 is 0.8-1.2, i.e., the distance L6 and the distance L7 are relatively close, which can reduce the size of the vibration direction B of the air guide sound production device 3 on the one hand, and on the other hand, the distance between the geometric center of the air guide coil 320 and the geometric center of the magnetic plate 313 approaches in the unpowered state, so that the positions of the main magnetic induction line and the air guide coil 320 are more symmetrical, so that the up-down amplitude of the air guide coil 320 after being powered is close, which can reduce distortion, improve sound restoration, and thus improve sound quality. Further optionally, the ratio of the distance L6 and the distance L7 is 0.9-1.1, and more further optionally, the two distances are equal. Optionally, the maximum amplitude of the air guide sound production device 3 is 0.2-0.7 mm, and further optionally 0.3-0.5 mm, if the amplitude is too small, the sensitivity is not enough, if the amplitude is too large, noise is easily generated, if the ratio is too small, the margin is not enough to easily generate noise, and if the ratio is too large, space is wasted. Further optionally, the difference between the distance L6 and the distance L7 and the maximum amplitude of the diaphragm 321 is 0.1-0.3 mm.

[0147] In some embodiments, reference is made to Figure 24 and Figure 38, in order to enhance the strength of the intermediate sheet 3211, improve the sound quality, the diaphragm assembly 32 further comprises a reinforcing sheet 3213 attached to the surface of the intermediate sheet 3211, the material of the reinforcing sheet 3213 can be the same as or different from the material of the diaphragm 321. Optionally, the reinforcing sheet 3213 and the intermediate sheet 3211 have the same shape and area, and the projection of the reinforcing sheet 3213 along the thickness direction of the reinforcing sheet 3213 coincides with the intermediate sheet 3211, so as to comprehensively reinforce the intermediate sheet 3211. Optionally, the thickness of the reinforcing sheet 3213 is 0.08-0.3mm, and the material of the reinforcing sheet 3213 is a high polymer or a metal or a composite of a high polymer and a metal; the high polymer may, for example, be polyethylene, polypropylene, polyester, polyetherimide, polyethylene terephthalate, carbon fiber composite material or pulp fiber composite material, etc.; the metal may, for example, be aluminum, aluminum alloy, titanium, titanium alloy, aluminum-based material and foaming material, titanium-based material and foaming material, etc. The composite of the high polymer and the metal may, for example, be an aluminum layer in the middle of the carbon fiber composite material. It can be understood that when the reinforcing sheet 3213 is provided, the intermediate sheet 3211 can not be fully enclosed, as shown in Figure 38 , Figure 38 is an exploded view of the diaphragm 321 and the reinforcing sheet 3213 of an embodiment, and the intermediate sheet 3211 is provided with an opening 32110, and the reinforcing sheet 3213 is connected to the intermediate sheet 3211 to seal the hole, which can reduce the mass of the diaphragm assembly 32.

[0148] Optionally, the area of the reinforcing sheet 3213 ranges from 30 to 65mm 2 , and the area ratio of the reinforcing sheet 3213 to the diaphragm 321 ranges from 0.35 to 0.65. A large area ratio of the reinforcing sheet 3213 to the diaphragm 321 is beneficial to strengthening the rigidity of the spherical top of the diaphragm 321, which can extend the high-frequency cutoff frequency, but if the area ratio is too large, the proportion of the folded ring part 3212 will be reduced, and if the folded ring part 3212 is too small, it will cause the F0 to rise. By setting the area ratio of the reinforcing sheet 3213 to the diaphragm 321 to 0.35-0.65, the high-frequency cutoff frequency can be ensured not to be too forward, and the F0 can be ensured to be within the preset range and not too high.

[0149] In some embodiments, referring to Figure 24 and Figure 37 , the air guide sound device 3 further comprises a gland 33, the gland 33 is annular, and the surface of the outer ring sheet 3210 is connected to the gland 33, and the gland 33 extends to be arranged opposite to the folded ring part 3212, thereby protecting the internal folded ring part 3212, and at the same time, the gland 33 is provided with a flat outer end surface 330, which can be connected to the shell assembly 100 through the outer end surface 330, for example, by coating glue or providing double-sided adhesive tape 331 on the outer end surface 330, so as to be connected to the shell assembly 100 by gluing, Figure 40The case when the double-sided adhesive tape 331 is arranged on the outer end surface 330 is shown. Optionally, the inner end 334 of the cover 33 (close to the end of the middle sheet 3211) is provided with a recess 332 towards the surface of the diaphragm 321, the recess 332 makes the part closer to the inner end 334 of the cover 33 farther away from the middle sheet 3211 in the vibration direction B, thereby reliably avoiding the vibration of the diaphragm 321. Optionally, referring to Figure 22 and Figure 23 The end surface 300 of the air guide support 30 is provided with a plurality of outward convex columns 301, and the cover 33 is provided with limiting grooves 333 matched with the convex columns 301, and the positioning of the cover 33 is realized by the matching of the limiting grooves 333 and the convex columns 301. Optionally, the convex columns 301 are arranged at the four corners of the air guide support 30, and the limiting grooves 333 are arranged at the four corners of the cover 33.

[0150] It can be understood that in the embodiment in which the air guide sound production device 3 does not include the cover 33, the outer ring sheet 3210 can be connected to the shell 1000 and the diaphragm 321 can be made to seal the front cavity 10042. For example, in the embodiment in which the side shell part 1004 is not provided with the mounting groove 10041, the outer ring sheet 3210 can be connected to the inner wall of the side shell part 1004, and in the embodiment in which the side shell part 1004 is provided with the mounting groove 10041, the outer ring sheet 3210 can be connected to the groove bottom surface 10043. In the embodiment in which the air guide sound production device 3 includes the cover 33, the cover 33 can be connected to the shell 1000 and the air guide sound production device 3 can be made to seal the front cavity 10042. For example, in the embodiment in which the side shell part 1004 is not provided with the mounting groove 10041, the cover 33 can be connected to the inner wall of the side shell part 1004, and in the embodiment in which the side shell part 1004 is provided with the mounting groove 10041, the cover 33 can be connected to the groove bottom surface 10043.

[0151] In some embodiments, the effective radiation area Sd of the diaphragm 321 ranges from 0.5 cm 2 to 1.4 cm 2; the larger the effective radiation area Sd of the diaphragm 321, the greater the energy of radiation, and the higher the sensitivity. Meanwhile, the larger the effective radiation area Sd, the larger the cross-sectional area of the air guide coil 320 and the magnetic circuit assembly inside the air guide coil 320 can be, thereby improving the BL value and driving force, and improving the sensitivity. However, the effective radiation area Sd also affects the size of the air guide sound generating device 3. The larger the effective radiation area Sd, the larger the volume of the air guide sound generating device 3, which will occupy the installation space of the bone conduction sound generating device 2, affecting the bone conduction sound generating effect. Further, it will also increase the weight of the air guide sound generating device 3 and even the entire earphone head, affecting the comfort of wearing. On the contrary, when the effective radiation area Sd is too small, the air guide coil 320 and the magnetic circuit assembly will also be small, resulting in low sensitivity, low loudness, and poor sound quality of the air guide sound generating device 3. Moreover, it will also cause the performance of the bone conduction sound generating device 2 and the air guide sound generating device 3 to be unbalanced, affecting the overall sound generating effect. Therefore, the effective radiation area Sd is set to be in the range of 0.5 cm 2 ~ 1.4 cm 2 , which is beneficial to ensure that the air guide sound generating device 3 has appropriate sensitivity, and is beneficial to make the volume of the air guide sound generating device 3 more appropriate, and is beneficial to balance the sound generating performance and volume, mass, and other factors of the air guide sound generating device 3 and the bone conduction sound generating device 2, thereby improving the overall sound generating effect and wearing comfort of the earphone.

[0152] Further, the ratio of the effective radiation area Sd to the area of the entire diaphragm 321 is 0.55~0.75. The larger the proportion of the effective radiation area Sd to the diaphragm 321, the smaller the folded ring part 3212 will be. The smaller the folded ring part 3212, the higher the low frequency F0 will be. The selected effective radiation area Sd and the ratio of the effective radiation area Sd to the diaphragm area can better balance the sensitivity and the low frequency F0, and obtain a better sound quality. Further, the effective radiation area of the diaphragm 321 is 0.75 cm 2 ~ 1.2 cm 2 . It should be noted that, with reference to Figure 41 and Figure 42 , the effective radiation area Sd refers to the size of the area enclosed by the center line 3212a of the folded ring part 3212, and the area of the diaphragm 321 refers to the size of the area enclosed by the outer edge of the diaphragm 321.

[0153] Optionally, the width W6 of the folded ring portion 3212 except for the corners thereof is 0.6-1.5 mm, and the height H8 of the folded ring portion 3212 is 0.2-0.5 mm. The wider the folded ring portion 3212, the lower the F0 of the air guide sound production device 3, but the wider the folded ring portion 3212, the more space it occupies in the air guide magnetic circuit assembly 31 and the smaller the effective vibration area, so the width of the folded ring portion 3212 cannot be too large or too small, and the range of 0.6-1.5 mm is a relatively ideal range of values. The higher the folded ring portion 3212, the lower the F0, but the higher the folded ring portion 3212, the more space it occupies in the thickness, and the range of 0.2-0.5 mm is a relatively ideal range of values. Optionally, the width-height ratio (i.e., W2 / H8) of the folded ring portion 3212 is 2-6. Setting the width-height ratio to 2-6 is conducive to maintaining good linearity when the diaphragm vibrates and reducing nonlinear distortion. In some embodiments, the folded ring portion 3212 is of uniform width, and in other embodiments, with reference to Figure 41 and Figure 42 , the width W8 of the four corners of the folded ring portion 3212 is greater than the width W6 of the other portions. When the diaphragm 321 vibrates, especially at high amplitudes, the corners tend to be areas of stress concentration, and increasing the width of the folded ring portion 3212 at the corners can help to disperse these stresses and reduce structural fatigue and damage caused by stress concentration.

[0154] Optionally, the ring width W7 of the outer ring sheet 3210 is 0.45-0.9 mm. If the ring width W7 of the outer ring sheet 3210 is too small, the bonding area with the air guide support 30 will be too small, and the bonding strength will be weak. If the ring width W7 of the outer ring sheet 3210 is too large, it will occupy a large area, making the area of the folded ring portion 3212 and the intermediate sheet body 3211 too small and affecting performance. Setting the ring width W7 of the outer ring sheet 3210 to 0.45-0.9 mm can ensure the bonding strength and provide sufficient space for the folded ring portion 3212 and the intermediate sheet body 3211.

[0155] In some embodiments, with reference to Figure 42 and Figure 43 , the four corners of the folded ring portion 3212 of the rectangular ring shape are each provided with a pleat pattern 3214 to improve the strength of the diaphragm 321. The pleat pattern 3214 includes a plurality of protrusions 32140 protruding away from the air guide magnetic circuit assembly 31 and a plurality of recesses 32141 recessed toward the air guide magnetic circuit assembly 31. Optionally, the total number of protrusions 32140 per corner is 3-18, and further optionally 5-12. The pleat patterns 3214 of the four corners are arranged axially symmetrically or centrally symmetrically, as shown in Figure 42As shown, the four wrinkle patterns 3214 are symmetrical to a first symmetry line 321a and a second symmetry line 321b perpendicular to the first symmetry line 321a, so that the vibration of the diaphragm 321 is more balanced, the first symmetry line 321a and the second symmetry line 231b both pass through the center of the middle sheet body 3211 and are parallel to the width direction and the length direction of the middle sheet body 3211 respectively. Further optionally, the four corners of the folded ring part 3212 are arc-shaped, the arc shape is symmetrical to a third symmetry line 321c, and the wrinkle pattern 3214 is also symmetrical to the third symmetry line 321c, further ensuring the balance of the vibration of the diaphragm 321. The width and the depth of the wrinkle pattern 3214 affect the compliance of the diaphragm 321 and the low frequency F0 of the air-conducting sound generating device, the wider the pattern is, the lower the F0 is, but the strength of the diaphragm 321 is weakened, the width L10 and the height H6 of the protrusion 32140 of the wrinkle pattern 3214 are respectively set to 0.1-0.3mm and 0.05-0.15mm, so that the compliance and the strength of the diaphragm 321 can be balanced. Optionally, the depth of the wrinkle pattern 3214 is generally half of the width.

[0156] In some embodiments, the diaphragm 321 is made of a low-density material other than silica gel, such as PAR, PEI, PEEK, PC, TPE, TPEE or TPU, or the diaphragm 321 is a composite diaphragm made of a diaphragm made of these materials. The total mass of the diaphragm 321 and the reinforcing sheet 3213 is 5-35mg, and further optionally 8-20mg, and the wall thickness of the diaphragm 321 is 0.01-0.025mm, so as to reduce the mass of the diaphragm 321 and make the mass of the air-conducting sound generating device 3 as light as possible. In other embodiments, the diaphragm 321 is made of silica gel, the wall thickness of the silica gel diaphragm is 0.08-0.25mm, and the total mass of the diaphragm 321 and the reinforcing sheet 3213 is 5-35mg. When the diaphragm 321 is made of a silica gel diaphragm, the folded ring part 3212 is optionally uniform in width, and the wrinkle pattern 3214 described below is not provided.

[0157] It should be noted that the embodiments herein can be combined with each other without conflict, thereby obtaining more embodiments.

[0158] The above is only a specific implementation manner of the present application, and any improvement made on the basis of the concept of the present application is considered as the protection scope of the present application.

Claims

1. A sound emitting unit, characterized by, The bone conduction sound generating device (2) and the air conduction sound generating device (3) are both arranged in the shell assembly (100), the shell assembly (100) is provided with a sound outlet hole (1003) for the sound of the air conduction sound generating device (3) to pass out, and the air conduction sound generating device (3) comprises: An air conduction support (30); An air conduction magnetic circuit assembly (31) arranged in the air conduction support (30) and comprising an air conduction magnetic gap (315); and A diaphragm assembly (32) comprising a diaphragm (321) connected to the air conduction support (30) and an air conduction coil (320) connected to the diaphragm (321), wherein the air conduction coil (320) is located in the air conduction magnetic gap (315); The effective radiating area Sd of the diaphragm (321) is 0.5 cm 2 ~1.4 cm 2 .

2. The sound producing unit of claim 1, wherein, The ratio of the effective radiation area Sd to the area of the entire diaphragm (321) is 0.55-0.

75.

3. The sound producing unit of claim 1, wherein, The diaphragm (321) comprises an outer ring sheet (3210) connected to the air conduction support (30), an intermediate sheet body (3211) located in the outer ring sheet (3210), and a folded ring portion (3212) located between the outer ring sheet (3210) and the intermediate sheet body (3211), the folded ring portion (3212) encloses the area between the outer ring sheet (3210) and the intermediate sheet body (3211), and the folded ring portion (3212) is recessed towards the side where the air conduction magnetic circuit assembly (31) is located or protrudes away from the side where the air conduction magnetic circuit assembly (31) is located.

4. The sound producing unit of claim 3, wherein, The width W6 of the folded ring portion (3212) except for the corner portion thereof is 0.6-1.5 mm, and the height H8 of the folded ring portion (3212) is 0.2-0.5 mm.

5. The sound producing unit of claim 4, wherein, The width-height ratio of the folded ring portion (3212) is 2-6.

6. The sound producing unit of claim 4, wherein, The folded ring portion (3212) is of equal width; or The folded ring portion (3212) is in the shape of a rectangular ring, and the width W8 of the four corner portions of the folded ring portion (3212) is greater than the width W6 of other portions.

7. The sound producing unit of claim 4, wherein, The folded ring portion (3212) has four corner portions, and the four corner portions of the folded ring portion (3212) are provided with a wrinkle pattern (3214), the wrinkle pattern (3214) comprises a plurality of protrusions (32140) protruding away from the air conduction magnetic circuit assembly (31) and recesses (32141) recessed towards the air conduction magnetic circuit assembly (31), and the number of protrusions (32140) of each corner portion is 3-18.

8. The sound producing unit of claim 7, wherein, The wrinkle patterns (3214) of the four corner portions are symmetrical with respect to a first symmetry line (321a) and a second symmetry line (321b) perpendicular to the first symmetry line (321a).

9. The sound producing unit of claim 8, wherein, The corner portions of the folded ring portion (3212) are in the shape of an arc symmetrical with respect to a third symmetry line (321c), and the wrinkle patterns (3214) are symmetrical with respect to the third symmetry line (321c).

10. The sound producing unit of claim 7, wherein, The width L10 of the protrusions (32140) is 0.1-0.3 mm, and the height H6 is 0.05-0.15 mm.

11. A sound producing unit according to any one of claims 3 to 10, characterized in that The outer ring sheet (3210) is in the shape of a rectangular ring, which is in contact with the end face of the air conduction support (30), and the ring width W7 of the outer ring sheet (3210) is 0.45-0.9 mm.

12. A sound producing unit according to any one of claims 3 to 10, characterized in that The diaphragm assembly (32) further comprises a reinforcing sheet (3213) connected to the surface of the intermediate sheet (3211), and the area ratio of the reinforcing sheet (3213) to the diaphragm (321) is 0.35-0.

65.

13. The sound producing unit of claim 12, wherein, The area of the reinforcing sheet (3213) ranges from 30 to 65 mm².

14. The sound producing unit of claim 12, wherein, The reinforcing sheet (3213) has the same shape and area as the intermediate sheet (3211), and the projection of the reinforcing sheet (3213) on the thickness direction of the reinforcing sheet (3213) coincides with the intermediate sheet (3211).

15. The sound producing unit of claim 12, wherein, The thickness of the reinforcing sheet (3213) is 0.08-0.3 mm. The material of the reinforcing sheet (3213) is a high polymer, a metal, or a composite of a high polymer and a metal. The high polymer is polyethylene, polypropylene, polyester, polyetherimide, polyethylene terephthalate, carbon fiber composite material, or paper pulp fiber composite material. The metal is aluminum, aluminum alloy, titanium, titanium alloy, a composite of aluminum base material and foaming material, or a composite of titanium base material and foaming material.

16. A sound producing unit according to any one of claims 3 to 10, wherein The cross section of the folded ring portion (3212) is arc-shaped.

17. A sound producing unit according to any one of claims 1 to 9, characterized in that The diaphragm (321) is made of PAR, PEI, PEEK, PC, TPE, TPEE, or TPU, or is a composite diaphragm made of a diaphragm made of PAR, PEI, PEEK, PC, TPE, TPEE, or TPU, and the wall thickness of the diaphragm (321) is 0.01-0.025 mm. The diaphragm (321) is made of silica gel, and the wall thickness of the diaphragm (321) is 0.08-0.25 mm.

18. A sound producing unit according to any one of claims 3 to 10, wherein The housing assembly (100) comprises a front cavity (10042) and a rear cavity (10044) separated by the diaphragm (321), the sound hole (1003) communicates with the front cavity (10042), and the volume of the front cavity (10042) is 10-250 cubic millimeters. The outer contour of the cross section of the air guide sound production device (3) perpendicular to the vibration direction B is rectangular, and the outer contour of the cross section of the front cavity (10042) perpendicular to the vibration direction B is also rectangular.

19. The sound producing unit of claim 18, wherein, The area of the sound hole (1003) is 10-130 mm².

20. A sound producing unit according to any one of claims 3 to 10, wherein The housing assembly (100) comprises a shell (1000) and a face cover (1001) connected to the end face of the shell (1000), and the shell (1000) comprises a back cover (1002) and a side shell portion (1004). The inner wall of the side shell portion (1004) is provided with a mounting groove (10041), and the air guide sound production device (3) is at least partially located in the mounting groove (10041), one side of the mounting groove (10041) extends to the end face (1000a) of the shell (1000) and has an opening towards the end face (1000a), and the other side of the mounting groove (10041) extends to the inner surface of the back cover (1002) or is spaced apart from the inner surface of the back cover (1002).

21. A sound producing unit according to any one of claims 3 to 10, wherein The air-guiding magnetic circuit assembly (31) comprises a magnetic guiding bottom plate (3100) connected with the air-guiding support (30), a main magnet (311) connected with the magnetic guiding bottom plate (3100), and a main pole core plate (313) connected with the main magnet (311), and further comprises a magnetic guiding side plate (3101) connected with the magnetic guiding bottom plate (3100) and / or a secondary magnet (312) connected with the magnetic guiding bottom plate (3100) and a secondary pole core plate (314) connected with the secondary magnet (312), the magnetic guiding side plate (3101) and / or the secondary pole core plate (314) and the main pole core plate (313) form an air-guiding magnetic gap (315), the magnetic poles of the main magnet (311) and the secondary magnet (312) are arranged along the vibration direction B of the air-guiding sound production device (3), and the arrangement directions of the magnetic poles of the two are opposite.

22. A head-mounted sound production device, comprising: The sound production unit comprises the sound production unit as claimed in any one of claims 1 to 21.

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