Bone conduction earphone

Abstract

The utility model discloses a bone conduction earphone which comprises an earphone head, a bone conduction sounding device, a circuit assembly and a limiting piece. The earphone head comprises a first shell and a second shell which are connected; the bone conduction sounding device comprises a vibration assembly, a stator assembly and a first elastic sheet. The circuit assembly comprises a circuit board which is located on one side of the bone conduction sounding device away from the second shell, and the first elastic sheet is located at the end of the bone conduction sounding device close to the circuit board; the limiting piece is at least partially located between the first elastic piece and the circuit board. According to the utility model, the limiting piece is arranged, so that when the bone conduction sound production device works, the bone conduction sound production device can be prevented from impacting a circuit assembly or other parts in the bone conduction earphone, and possible collision noise is reduced.

Description

[0001] Priority information: This application claims priority to Chinese Patent Application No. 202311248126.6 filed on September 26, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The utility model relates to the technical field of bone conduction sound generation, in particular to a bone conduction earphone. Background Art

[0003] Bone conduction earphones can convert electrical signals into mechanical vibration signals, and transmit the mechanical vibration signals to the human auditory nerve through human tissue and bones, so that the wearer can hear the sound. Bone conduction earphones usually rely on shrapnel to transmit vibrations. Common bone conduction earphones have single shrapnel structure and double shrapnel structure.

[0004] A bone conduction sound-generating device is provided inside the bone conduction earphone. The vibration component of the bone conduction sound-generating device is connected to the shrapnel, and the shrapnel provides the restoring force during vibration. When the bone conduction sound-generating device is installed in the earphone head, the shrapnel is adjacent to the circuit board, wires and other circuit components in the earphone head. Due to the installation error of the electronic components on the wires or circuit boards, the shrapnel may rub against the wires or circuit boards when the vibration component vibrates, thereby generating noise. Moreover, in the event of an accident such as a fall or collision, the shrapnel of the bone conduction sound-generating device may be displaced to a large extent and hit the wires or circuit boards, which may easily cause damage to the electronic components or shrapnel and other components, thereby affecting the performance of the bone conduction earphone.

[0005] Therefore, it is necessary to improve the prior art to overcome the above defects in the prior art. Utility Model Content

[0006] The utility model aims to provide a bone conduction earphone, which can reduce the risk of the bone conduction sound generating device contacting the circuit assembly or other components.

[0007] In order to achieve the above-mentioned utility model object, the utility model proposes a bone conduction earphone, comprising

[0008] An earphone head, comprising a first shell and a second shell connected to each other;

[0009] A bone conduction sound generating device is arranged inside the first housing and connected to the second housing, comprising a vibration component, a stator component and a first spring piece, wherein the vibration component is driven to vibrate by the stator component, and the first spring piece is connected to the vibration component;

[0010] a circuit assembly, comprising a circuit board, the circuit board being arranged inside the first housing and electrically connected to the bone conduction sound-generating device, the circuit board being located at a side of the bone conduction sound-generating device away from the second housing, the first spring being located at an end of the bone conduction sound-generating device close to the circuit board; and,

[0011] The limiting member is at least partially located between the first elastic piece and the circuit board.

[0012] Furthermore, the limiting member is relatively fixed to the circuit board and has a distance between it and the first elastic sheet; the distance is 1 to 4 times the maximum displacement of the first elastic sheet when the bone conduction sound generating device is working.

[0013] Furthermore, the limiting member vibrates with the first spring piece and has a distance between it and the circuit board; the distance is 1 to 4 times the maximum displacement of the first spring piece when the bone conduction sound generating device is working.

[0014] Furthermore, the spacing is 1.2 times to 1.6 times the maximum displacement of the first spring piece when the bone conduction sound generating device is working.

[0015] Furthermore, the limiting member is connected to the first housing, or the circuit board or the first elastic sheet.

[0016] Furthermore, the limiting member is connected to the inner wall of the first shell so as to be relatively fixed to the circuit board, and the limiting member extends from the inner wall of the first shell to between the first spring sheet and the circuit board. The bone conduction earphone includes one or more than two limiting members.

[0017] Furthermore, the bone conduction sound generating device includes a fixing part, which is relatively fixed to the second shell, and the limiting member includes a connecting part and a limiting part, the connecting part is connected to the fixing part so that the limiting member is relatively fixed to the circuit board, the limiting part is connected to the connecting part, and the limiting part extends between the first spring sheet and the circuit board.

[0018] Furthermore, the first housing includes an inner bottom surface, the circuit board is arranged opposite to the inner bottom surface, the limiting member is connected to the inner bottom surface to be fixed relative to the circuit board, and the limiting member passes through the circuit board and extends to below the first elastic sheet.

[0019] Furthermore, the limiting member is connected to the upper end surface of the circuit board so as to be relatively fixed to the circuit board.

[0020] Furthermore, at least one of the limiting members is connected to the lower end surface of the first elastic piece so that the limiting member vibrates along with the first elastic piece, and a blank area opposite to the limiting member is reserved on the circuit board.

[0021] Furthermore, the limiting member is made of plastic, metal, alloy or polymer composite material.

[0022] Further, the first elastic piece includes an outer bracket, an inner bracket and an elastic arm, the inner bracket is arranged in the outer bracket, the elastic arm is connected between the outer bracket and the inner bracket, and the vibration component is directly connected to the inner bracket;

[0023] When the limiting member is relatively fixed to the circuit board, the limiting member and the inner bracket are relatively spaced apart;

[0024] When the limiting member vibrates with the first elastic piece, the limiting member is arranged relatively spaced apart from the circuit board and is connected to the inner bracket.

[0025] Furthermore, the bone conduction sound generating device comprises:

[0026] A shell, comprising an inner cavity, wherein the vibration assembly and the stator assembly are installed inside the inner cavity, the shell is provided with a first opening end and a second opening end, and the first elastic sheet is provided at the first opening end; and,

[0027] A second elastic piece, wherein the second elastic piece is arranged at the second opening end;

[0028] The first elastic piece and the second elastic piece are respectively connected to two ends of the vibration direction of the vibration component.

[0029] Furthermore, the first spring piece and the second spring piece have the same structure, both comprising an outer bracket, an inner bracket and an elastic arm, the outer bracket is relatively fixed to the shell, the inner bracket is arranged in the outer bracket, and the elastic arm is connected between the outer bracket and the inner bracket.

[0030] Furthermore, the shell is connected to the outer bracket, and the vibration component is directly connected to the inner bracket, or the vibration component is connected to the inner bracket via a gasket.

[0031] Furthermore, the number of the elastic arms is two, and the two elastic arms are centrally symmetrically arranged.

[0032] Furthermore, the stator component includes a coil, the vibration component includes at least one magnet, and the coil surrounds the outer circumference of the vibration component.

[0033] Compared with the prior art, the utility model has the following beneficial effects: the bone conduction earphone provided by the utility model is provided with a limiter, and the limiter is arranged at a relative interval with the first spring sheet and / or the circuit board to limit the maximum displacement of the first spring sheet, so that when the bone conduction sound-generating device is working or accidentally falls, it can prevent the vibration assembly from colliding with the electronic components or other parts in the bone conduction earphone due to excessive instantaneous displacement. With the restriction of the limiter, when the instantaneous displacement is too large, the vibration assembly will first collide with the limiter, and the limiter has a certain strength or buffering property. On the one hand, it can prevent the spring sheet of the sound-generating device from causing permanent irreversible deformation due to excessive displacement, and on the other hand, it can prevent the vibration assembly from directly colliding with other parts or components, thereby achieving the purpose of protecting other parts and electronic components, and at the same time reducing the possible collision noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of the bone conduction earphone in the utility model;

[0035] Figure 2 It is a cross-sectional view of the bone conduction earphone in the utility model;

[0036] Figure 3 It is a cross-sectional view of another structure of the bone conduction earphone in the utility model;

[0037] Figure 4 It is a cross-sectional view of another structure of the bone conduction earphone in the utility model;

[0038] Figure 5 It is a cross-sectional view of another structure of the bone conduction earphone in the utility model;

[0039] Figure 6 It is a cross-sectional view of another structure of the bone conduction earphone in the utility model;

[0040] Figure 7 It is a schematic diagram of the position of the circuit component in the first housing of the utility model;

[0041] Figure 8 It is a cross-sectional view of another structure of the earphone head of the bone conduction earphone in the utility model;

[0042] Fig. 9 It is a structural schematic diagram of the bone conduction sound generating device of the bone conduction earphone in the utility model;

[0043] Fig.10 It is a cross-sectional view of the bone conduction sound generating device of the bone conduction earphone in the utility model. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures related to the present application are shown in the accompanying drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0045] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0046] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] like Figures 1 to 7 As shown, the present application proposes a bone conduction earphone, comprising an earphone head 1, a bone conduction sound generating device 2, a circuit component 3 and a limiter 4.

[0048] The earphone head 1 comprises a first shell 101 and a second shell 102 connected to the open end of the first shell 101. The second shell 102 seals the open end of the first shell 101. When in use, the second shell 102 contacts the user's skin to transmit vibration.

[0049] The bone conduction sound generating device 2 is disposed inside the first housing 101 and connected to the second housing 102 , and includes a vibration component 201 , a stator component 202 for driving the vibration component 201 to vibrate, and a first elastic piece 203 connected to the vibration component 201 .

[0050] The circuit assembly 3 is arranged in the first housing 101, and includes a circuit board 301 electrically connected to the bone conduction sound generating device. The circuit assembly is composed of the circuit board 301 and a variety of electronic components arranged on the circuit board 301, and is used to control the operation of the bone conduction sound generating device 2.

[0051] The limiting member 4 is at least partially located between the first spring piece 203 and the circuit board 301, and there is a gap between the limiting member 4 and the first spring piece 203; or, the limiting member 4 vibrates with the first spring piece 203, and there is a gap between the limiting member 4 and the circuit board 301; the gap is 1 to 4 times the maximum displacement of the first spring piece 203 when the bone conduction sound-generating device 2 is working, so as to limit the maximum displacement of the first spring piece 203 without affecting the normal operation of the bone conduction sound-generating device 2. The spacing should be selected in a moderate range. When the spacing is too small, the sound-generating unit may hit the limiting member during normal operation, thereby causing sound noise; when the spacing is set too large, when the sound-generating unit generates an instantaneous large displacement, it cannot hit the limiting member, thereby losing the limiting function, causing the yield deformation of the spring piece and irreversible deformation, and finally causing poor performance of the product such as noise. Preferably, the spacing H is 1.1 to 3 times of the maximum displacement of the first spring piece 203, more preferably, the spacing H is 1.2 to 2 times of the maximum displacement of the first spring piece 203, and more preferably, the spacing H is 1.2 to 1.6 times of the maximum displacement of the first spring piece 203. The maximum displacement of the first spring piece 203 refers to the maximum value of the displacement of each frequency when the bone conduction sound generating device is working normally and the maximum working voltage is input within the frequency range of 20Hz-20KHz.

[0052] The limiting member 4 is used to limit the first spring piece 203 of the bone conduction sound generating device 2. Especially in the event of an abnormal situation such as a collision or impact, the limiting member 4 can prevent the bone conduction sound generating device 2 from damaging the first spring piece 203 due to excessive displacement. In addition, it can prevent the electronic components or other parts on the circuit assembly 3 in the earphone head 1 from being hit, thereby improving the reliability of the product.

[0053] like Figures 2 to 5 As shown, the first housing 101 includes a bottom plate 1011 and an annular side wall 1012 extending from the outer edge of the bottom plate 1011, the second housing 102 is connected to the open end of the annular side wall 1012, the surface of the bottom plate 1011 located inside the first housing 101 is the inner bottom surface 1013 of the first housing 101, the circuit board 301 is arranged opposite to the inner bottom surface 1013, and is fixedly connected to the bottom plate 1011 and / or the annular side wall 1012. The surfaces of the bottom plate 1011 and the second housing 102 that contact the human body are respectively located at the two ends of the vibration direction of the vibration component 201.

[0054] In this embodiment, the first spring sheet 203 and the circuit assembly 3 are located in the rear cavity area of ​​the bone conduction earphone, and the stopper is arranged on the outside of the first spring sheet 203, and the stopper is connected to the first housing 101 or the circuit board 301 or the first spring sheet 203, for example, by gluing or welding. Figure 7As shown, the first elastic piece 203 includes an annular outer bracket 206, an inner bracket 207 located inside the outer bracket 206, and an elastic arm 208 connected between the outer bracket 206 and the inner bracket 207. The inner bracket 207 is connected to the vibration assembly 201, and the limiting member 4 is at least partially spaced relative to the movable part of the first elastic piece 203 (i.e., the inner bracket 207 and the elastic arm 208) or the circuit board 301 to limit the displacement of the first elastic piece 203.

[0055] refer to Figure 2 In some embodiments, the stopper 4 is connected to the inner wall of the first housing 101 so as to be fixed relative to the circuit board 301. The stopper 4 extends from the inner wall of the first housing 101 to between the first spring sheet 203 and the circuit board 301, and a spacing H is left between the stopper 4 and the first spring sheet 203. The spacing H refers to the minimum distance between the inner bracket 207 of the first spring sheet 203 and the stopper 4 when the vibration component 201 is in the original position. The stopper 4 is plate-shaped or rod-shaped, and can be horizontally extended, inclinedly extended, straight-line or arc-shaped, or a combination of the two. In this embodiment, as Figure 2 As shown, the stopper 4 is plate-shaped, and two stoppers 4 are arranged on the inner wall of the first housing 101 opposite to each other, and a spacing H is left between them and the first elastic sheet 203. In other embodiments, the stopper 4 can also be one or more. The material of the stopper 4 can be plastic, metal, alloy or polymer composite material, and the cross-sectional shape of the stopper 4 can be circular, rectangular, polygonal or irregular, and its material and shape are not limited. In this embodiment, the stopper 4 is a rectangular plate structure or a cylindrical structure.

[0056] refer to Figure 3 The bone conduction sound generating device 2 includes a fixed portion relatively fixed to the second housing 102 (the fixed portion is, for example, the housing 204 of the bone conduction sound generating device 2 and the outer bracket 206 of the spring mentioned below), the limiting member 4 includes a connecting portion 401 and a limiting portion 402, the connecting portion 401 is connected to the fixed portion to fix the limiting member 4 and the circuit board 301 relatively, the limiting portion 402 is connected to the connecting portion 401, the limiting portion 402 extends between the first spring 203 and the circuit board 301, and a spacing H is left between the limiting portion 402 and the first spring 203, the spacing H refers to the minimum distance between the inner bracket 207 of the first spring 203 and the limiting member 4 when the vibration assembly 201 is in the original position. In this embodiment, Figure 3 As shown, the connection part 401 is connected to the outer surface of the shell 204 or to the outer bracket 206 of the spring. Preferably, the limiting member 4 is in a cover shape, and its connection part 401 is ring-shaped. The limiting part 402 is located inside the connection part 401 and is plate-shaped.

[0057] refer to Figures 4 to 6 In other embodiments, the limiting member 4 is block-shaped, such as Figure 4As shown, the stopper 4 is connected to the inner bottom surface 1013 so as to be relatively fixed to the circuit board 301. The stopper 4 extends through the circuit board 301 to the bottom of the first spring sheet 203, and a spacing H is left between the stopper 4 and the first spring sheet 203. The spacing H refers to the minimum distance between the inner bracket 207 of the first spring sheet 203 and the stopper 4 when the vibration assembly 201 is in the original position; Figure 5 As shown, the stopper 4 is connected to the upper end surface of the circuit board 301 so that it is relatively fixed to the circuit board 301, and a spacing H is left between it and the first elastic sheet 203. The spacing H refers to the minimum distance between the inner bracket 207 of the first elastic sheet 203 and the stopper 4 when the vibration assembly 201 is in the original position; Figure 6 As shown, at least one stopper 4 is connected to the lower end surface of the first spring piece 203 so that the stopper 4 vibrates with the first spring piece 203 and a spacing H is left between the stopper 4 and the circuit board 301, and the spacing H refers to the minimum distance between the circuit board 301 and the stopper 4 when the vibration assembly 201 is in the original position. The circuit board 301 leaves a blank area arranged opposite to the stopper 4 to prevent the stopper 4 from colliding with the electronic components on the circuit board 301.

[0058] By reasonably limiting the size of the spacing H, the limiting member 4 can be prevented from colliding with the first spring sheet or the circuit module when the bone conduction sound-generating device 2 is working normally, thereby reducing the possible collision noise. The selection of the distance H should be within a moderate range. When the spacing is too small, the sound-generating unit may collide with other parts during normal operation, thereby causing the sound noise; when the spacing is set too large, when the sound-generating unit produces an instantaneous large displacement, the limiting member loses the limiting function due to the large spacing, which will cause the yield deformation of the spring sheet and irreversibility, and ultimately cause the poor performance of the product such as noise. At the same time, the limiting member 4 can play a limiting role, which can prevent the elastic arm 208 of the first spring sheet 203 from being displaced too much when the bone conduction earphone is subjected to mechanical impact such as falling, and the elastic arm is deformed due to excessive stress. Preferably, a flexible layer (not shown in the figure) can also be set on the limiting member 4. Through the buffering effect of the flexible layer, the collision noise can be further reduced and the damage can be prevented.

[0059] In some embodiments, the first housing 101 and the second housing 102 are separate components. In other embodiments, the first housing 101 and the second housing 102 may also be composed of multiple components connected together. Figure 8 In other embodiments, the first shell 101 can be composed of two parts, including a bottom shell 1014 for accommodating the circuit component 3 and a middle shell 1015 connected to the second shell 102. It can be understood that the bottom shell 1014 is connected to the middle shell 1015, and the middle shell 1015 is further connected to the second shell 102, so that the overall assembly of the earphone head 1 is more convenient.

[0060] As a preferred embodiment, Fig. 9 and Fig.10 As shown, the bone conduction sound generating device 2 further includes a housing 204 and a second spring 205. The housing 204 includes an inner cavity 2041 for mounting the vibration component 201 and the stator component 202. Meanwhile, the housing 204 is provided with a first opening end 2042 and a second opening end 2043. The first spring 203 and the second spring 205 are respectively provided at the first opening end 2042 and the second opening end 2043. The two ends of the vibration direction C of the vibration component 201 are respectively connected to the first spring 203 and the second spring 205. The first spring 203 and the second spring 205 have the same structure. The double spring structure ensures the stability of the vibration component 201 and improves the reliability of the product.

[0061] Since the bone conduction sound generating device 2 is an integral component, it can be completely installed in the earphone head 1 after installation, thus making the assembly of the bone conduction earphone more convenient.

[0062] like Fig. 9 As shown, the first elastic sheet 203 and the second elastic sheet 205 each include an outer bracket 206 fixed relatively to the housing 204, an inner bracket 207 disposed in the outer bracket 206, and an elastic arm 208 connected between the outer bracket 206 and the inner bracket 207. The outer bracket 206 is connected to the housing 204, and the inner bracket 207 is directly connected to the vibration component 201 or connected through a gasket 210.

[0063] When the limiting member 4 is relatively fixed to the circuit board 301 , the limiting member 4 is relatively spaced apart from the inner bracket 207 ; when the limiting member 4 vibrates with the first elastic sheet 203 , the limiting member 4 is relatively spaced apart from the circuit board 301 and connected to the inner bracket 207 .

[0064] There are two elastic arms 208, and the two elastic arms 208 are centrally symmetrically arranged. The head end of the elastic arm 208 is connected to the outer circumference of the inner bracket 207, and the tail end of the elastic arm 208 is connected to the inner circumference of the outer bracket 206. The width and length of the elastic arm 208 are determined in response to design requirements. The arm width and length are adjusted as needed to cooperate with the vibration component of the bone conduction sound generating device to achieve the target F0 characteristics; generally speaking, the longer the arm length of the elastic arm 208 and the smaller the arm width, the easier it is to achieve a lower F0 characteristic, that is, the smaller the K value of the spring.

[0065] The double elastic arm shrapnel structure can provide more space for the elastic arm design, and a lower K value can be achieved under the conditions of the same wall thickness and elastic arm width; under the same vibration conditions, a lower F0 characteristic of the bone conduction sound generator can be achieved compared to the shrapnel structure with three or more elastic arms.

[0066] Further, such as Fig. 9As shown, the inner bracket 207 is provided with mounting holes 209, and the plurality of mounting holes 209 are symmetrically arranged. The mounting holes 209 are used to align and connect with the vibration assembly 201 of the bone conduction sound generating device 2 by using a tooling to facilitate the installation of the first spring piece 203 and the second spring piece 205, improve the accuracy after installation, and ensure the stability and firmness of the parts after installation. In some embodiments, reference Fig. 9 Two mounting holes 209 are provided on the inner bracket 207, and preferably, the two mounting holes 209 are centrally symmetrically arranged.

[0067] The stator component 202 includes a coil 2022, and the vibration component 201 includes at least one magnet 2011. The coil 2022 surrounds the outer circumference of the vibration component 201. After the coil 2022 is energized, it generates a changing magnetic field, causing the vibration component 201 to vibrate up and down under the action of the magnetic field.

[0068] In some embodiments, Fig.10 As shown, the vibration assembly 201 includes three magnets 2011 and two magnetic conductive plates 2012. The magnets 2011 are connected between two adjacent magnetic conductive plates 2012. The magnets 2011 are magnetized along the vibration direction C of the vibration assembly 201. Two adjacent magnets 2011 are arranged opposite to each other with the same poles. The magnetic conductive plates 2012 can guide the magnetic flux lines to pass through the stator assembly 202 more concentratedly. The two adjacent magnets 2011 are connected by the magnetic conductive plates 2012. It can be understood that in some other embodiments, the vibration assembly 201 can also be other structures, which is not limited in this application.

[0069] The stator assembly 202 includes a coil support 2021 connected to the housing 204 and two coils 2022 mounted on the coil support 2021, and the two coils 2022 are respectively surrounded by the outer circumference of the two magnetic conductive plates 2012. After the two coils 2022 are energized, they generate a changing magnetic field, causing the vibration assembly 201 to vibrate up and down under the action of the magnetic field. It is understandable that only one coil can be provided, and the vibration assembly 201 can be driven to vibrate by a single coil.

[0070] The vibration component 201 and the stator component 202 generate a driving force through the action of electromagnetic force, thereby driving the vibration component 201 to vibrate. The structures of the vibration component 201 and the stator component 202 are not limited.

[0071] When there are springs at both the upper and lower ends of the vibration component 201 of the bone conduction sound generating device 2, the first spring 203 will be in the rear cavity area inside the first shell 101, close to the circuit component 3, and the first spring 203 and the circuit component 3 can be isolated by the limiter 4, which can prevent the first spring 203 from hitting the electronic components or other parts on the circuit component 3, reduce the possible collision noise, and protect the first spring 203 and the circuit component 3.

[0072] The above are only specific implementations of the present invention, and any improvements made based on the concept of the present invention are considered to be within the protection scope of the present invention.

Claims

1. A bone conduction headset, characterized in that: include An earphone head, comprising a first shell and a second shell connected to each other; A bone conduction sound generating device is arranged inside the first housing and connected to the second housing, comprising a vibration component, a stator component and a first spring piece, wherein the vibration component is driven to vibrate by the stator component, and the first spring piece is connected to the vibration component; a circuit assembly, comprising a circuit board, the circuit board being arranged inside the first housing and electrically connected to the bone conduction sound-generating device, the circuit board being located at a side of the bone conduction sound-generating device away from the second housing, the first spring being located at an end of the bone conduction sound-generating device close to the circuit board; and, The limiting member is at least partially located between the first elastic piece and the circuit board.

2. The bone conduction earphone according to claim 1, characterized in that: The limiting member is relatively fixed to the circuit board and has a distance between it and the first elastic sheet; the distance is 1 to 4 times the maximum displacement of the first elastic sheet when the bone conduction sound generating device is working.

3. The bone conduction earphone according to claim 1, characterized in that: The limiting member vibrates with the first spring piece and has a distance between it and the circuit board; the distance is 1 to 4 times the maximum displacement of the first spring piece when the bone conduction sound generating device is working.

4. The bone conduction earphone according to claim 2 or 3, characterized in that: The distance is 1.2 to 1.6 times the maximum displacement of the first spring piece when the bone conduction sound generating device is working.

5. The bone conduction earphone according to claim 1, characterized in that: The limiting member is connected to the first housing, or the circuit board, or the first elastic sheet.

6. The bone conduction earphone according to claim 1, characterized in that: The limiting member is connected to the inner wall of the first shell so as to be relatively fixed to the circuit board. The limiting member extends from the inner wall of the first shell to between the first elastic sheet and the circuit board. The bone conduction earphone includes one or more than two limiting members.

7. The bone conduction earphone according to claim 1, characterized in that: The bone conduction sound generating device comprises a fixing part, which is relatively fixed to the second shell, and the limiting member comprises a connecting part and a limiting part, the connecting part is connected to the fixing part so that the limiting member is relatively fixed to the circuit board, the limiting part is connected to the connecting part, and the limiting part extends between the first spring sheet and the circuit board.

8. The bone conduction earphone according to claim 5, characterized in that: The first housing includes an inner bottom surface, the circuit board is arranged opposite to the inner bottom surface, the limiting member is connected to the inner bottom surface to be fixed relative to the circuit board, and the limiting member passes through the circuit board and extends to below the first elastic sheet.

9. The bone conduction earphone according to claim 5, characterized in that: The limiting member is connected to the upper end surface of the circuit board so as to be relatively fixed to the circuit board.

10. The bone conduction earphone according to claim 5, characterized in that: At least one of the limiting members is connected to the lower end surface of the first elastic piece so that the limiting member vibrates along with the first elastic piece, and a blank area opposite to the limiting member is reserved on the circuit board.

11. The bone conduction earphone according to any one of claims 1 to 3 and 5 to 10, characterized in that: The limiting member is made of plastic, metal, alloy or polymer composite material.

12. The bone conduction earphone according to any one of claims 1 to 3 and 5 to 10, characterized in that: The first elastic piece includes an outer bracket, an inner bracket and an elastic arm, the inner bracket is arranged in the outer bracket, the elastic arm is connected between the outer bracket and the inner bracket, and the vibration component is directly connected to the inner bracket; When the limiting member is relatively fixed to the circuit board, the limiting member and the inner bracket are relatively spaced apart; When the limiting member vibrates with the first elastic piece, the limiting member is arranged relatively spaced apart from the circuit board and is connected to the inner bracket.

13. The bone conduction earphone according to any one of claims 1 to 3 and 5 to 10, characterized in that: The bone conduction sound generating device comprises: A shell, comprising an inner cavity, wherein the vibration assembly and the stator assembly are installed inside the inner cavity, the shell is provided with a first opening end and a second opening end, and the first elastic sheet is provided at the first opening end; and, A second elastic piece, wherein the second elastic piece is arranged at the second opening end; The first elastic piece and the second elastic piece are respectively connected to two ends of the vibration direction of the vibration component.

14. The bone conduction earphone according to claim 13, characterized in that: The first elastic sheet and the second elastic sheet have the same structure, both comprising an outer bracket, an inner bracket and an elastic arm, the outer bracket is relatively fixed to the shell, the inner bracket is arranged in the outer bracket, and the elastic arm is connected between the outer bracket and the inner bracket; The shell is connected to the outer bracket, and the vibration component is directly connected to the inner bracket, or the vibration component is connected to the inner bracket via a gasket; The number of the elastic arms is two, and the two elastic arms are centrally symmetrically arranged.

15. The bone conduction earphone according to any one of claims 1 to 3 and 5 to 10, characterized in that: The stator component includes a coil, the vibration component includes at least one magnet, and the coil surrounds the outer circumference of the vibration component.

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