CN115119087A

CN115119087A - Bone conduction sound production unit and wearable equipment

Info

Publication number: CN115119087A
Application number: CN202210476066.2A
Authority: CN
Inventors: 曹洪斌; 陶志勇; 刘莹
Original assignee: Suzhou Suoye Electronic Technology Co ltd
Current assignee: Suzhou Suoye Electronic Technology Co ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-09-27
Anticipated expiration: 2042-04-29
Also published as: CN115119087B; WO2023208050A1

Abstract

The invention discloses a bone conduction sounding unit and wearable equipment. The flexible member is connected in the mounting hole of the housing. The vibration sound production module is arranged in the containing cavity, one end of the vibration sound production module is connected with the flexible piece, and the other end of the vibration sound production module is elastically connected with the shell. When the bone conduction sounding unit works, the influence of the vibration sounding module on the shell is small, so that the sound leakage is reduced, and the sound volume heard by a user is increased.

Description

Bone conduction sound production unit and wearable equipment

Technical Field

The invention relates to an acoustic device, in particular to a bone conduction sounding unit and wearable equipment.

Background

Some wearable devices are applied to have bone conduction technology to realize the transmission of sound, for example bone conduction earphone, bone conduction glasses etc. because bone conduction earphone can pass through the skull and pass through the sound, need not to pass through the air and pass through the sound, consequently receive noisy environment's interference little, can liberate the ears simultaneously, reduce because the plug-in uncomfortable sense that the earphone led to the fact of wearing.

At present, the vibration sound production module in the wearable equipment is usually directly fixed in the casing, and like this, the casing will be carried the vibration jointly when vibration sound production module is vibrating, forms the pendulum of big quality, needs great energy drive sound production, and the volume of wearable equipment is on the small side, and it is serious to leak the sound.

Accordingly, there is a need for improvements in the art that overcome the deficiencies in the prior art.

Disclosure of Invention

The invention aims to provide a bone conduction sounding unit and wearable equipment, which can reduce sound leakage.

To achieve the above object, in one aspect, the present invention provides a bone conduction sound generating unit, including:

the shell comprises an accommodating cavity, and a mounting hole communicated with the accommodating cavity is formed in the upper end face of the shell;

the flexible piece is connected in the mounting hole of the shell; and the number of the first and second groups,

the vibration sounding module is arranged in the accommodating cavity, one end of the vibration sounding module is connected with the flexible piece, and the other end of the vibration sounding module is elastically connected with the shell.

Further, the material of flexible piece is silica gel, rubber or TPE, the hardness of flexible piece is 10 ~ 80 SHA.

Furthermore, the hardness of the silica gel is 40-70 SHA.

Further, the flexible piece is provided with a containing groove, and the end part of the vibration sound production module is connected in the containing groove in a matching mode.

Further, the flexible piece comprises a body part extending into the accommodating cavity, and the accommodating groove is arranged on an end face, facing the accommodating cavity, of the body part.

Further, the flexible piece includes a convex portion protruding from the side surface of the body portion, a first mounting groove and a second mounting groove opened on the groove bottom surface of the first mounting groove are formed in the upper end surface of the housing, the first mounting groove and the second mounting groove both penetrate through the front end surface and the rear end surface of the housing, the body portion is arranged in the first mounting groove, and the convex portion is arranged in the second mounting groove.

Further, the flexible part is flush with the upper end face of the shell, or the flexible part protrudes from the upper end face of the shell.

Further, the included angle range between the vibration axis of the vibration sound production module and the normal of the upper end face of the shell or the normal of the surface of the flexible piece, which is used for being in contact with the skin of a human body, is 0-30 degrees.

Furthermore, the bone conduction sounding unit further comprises a first elastic sheet, wherein the first elastic sheet comprises a support connected with the vibration sounding module and a first vibration arm connected between the support and the shell.

Further, the shell is provided with at least two supporting seats which are arranged at intervals, and the first vibrating arm is connected with the supporting seats.

Further, the shell comprises a first plate body and a second plate body which are arranged oppositely, the accommodating cavity is located between the first plate body and the second plate body, the flexible piece is connected to the first plate body, and the supporting seat is arranged on the second plate body.

Further, the second plate body is further provided with a limiting boss facing the vibration sound production module, and a vibration space is arranged between the limiting boss and the vibration sound production module.

Further, vibration sound production module includes one end open-ended frame, locates stator in the frame, connect in the second shell fragment of the open end of frame and with the active cell that the second shell fragment links to each other, the second shell fragment include with outer support body that the frame links to each other, locate the internal central body of outer support body and connect in outer support body with second vibration arm between the central body, the active cell with the central body links to each other, the support is equipped with dodges the central body with the hole of dodging of second vibration arm vibration.

Further, the vibration sound production module comprises an outer frame with an opening at one end and a stator and a rotor which are arranged in the outer frame, the support is connected to the opening end of the outer frame, the support is annular, the first elastic piece comprises a central body arranged in the support and a second vibration arm connected between the support and the central body, and the rotor is connected with the central body.

In another aspect, the present invention further provides a wearable device, including the bone conduction sound emitting unit as described in any one of the above.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, the flexible part is arranged on the shell, one end of the vibration sound production module is connected with the flexible part, and the other end of the vibration sound production module is elastically connected with the shell, so that the influence of the vibration sound production module on the shell can be reduced, the vibration of the shell is favorably reduced, the sound leakage is reduced, and the sound heard by a user is increased.

2. Through set up the holding tank on the flexible piece to in locating the holding tank with the tip of vibration sound production module, can all separate through the flexible piece between the periphery that can make vibration sound production module and the shell, the flexible piece can play better bradyseism effect.

3. Vibration sound production module passes through first shell fragment and realizes and the shell between elastic connection for the connection effect of vibration sound production module and shell is better, and difficult emergence of vibration is rocked, is rolled and is shaken at the in-process of vibration, and the reliability that bone conduction sound production unit used is better.

Drawings

Fig. 1 is a schematic structural diagram of a bone conduction sound emitting unit according to an embodiment of the present invention.

Fig. 2 is an exploded view of the bone conduction sound unit shown in fig. 1.

Fig. 3 is a left side view of the bone conduction sound emitting unit shown in fig. 1.

Fig. 4 is a schematic structural diagram of a first housing according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view of a housing of an embodiment of the present invention.

Fig. 6 is a sectional view of the bone conduction sound emitting unit shown in fig. 1.

FIG. 7 is a schematic view of a flexure according to an embodiment of the present invention.

Fig. 8 is a cross-sectional view of the bone conduction sound unit shown in fig. 1 in another viewing direction.

Fig. 9 is a schematic structural view illustrating a connection between a vibration sound module and a first elastic sheet according to an embodiment of the present invention.

Fig. 10 is a schematic structural diagram of a first elastic sheet according to an embodiment of the present invention.

Fig. 11 is a schematic structural view of a second housing according to an embodiment of the present invention.

Figure 12 is a cross-sectional view of a vibration sound module according to one embodiment of the present invention.

Fig. 13 is a schematic structural view of the vibration sound module shown in fig. 12.

Fig. 14 is a schematic structural diagram of a first elastic sheet according to an embodiment of the present invention.

Fig. 15 is a schematic structural view illustrating a connection between a first resilient piece and a second resilient piece according to an embodiment of the present invention.

Fig. 16 is a graph showing frequency response of a bone conduction sound emitting unit when a flexible member of the bone conduction sound emitting unit is made of silicone rubber with different hardness.

Fig. 17 is a graph of the amplitude of a bone conduction sound unit when its flexible member is made of silicone rubber of different hardness.

Fig. 18 is an enlarged view of a portion I in fig. 17.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "comprising" and "having," as well as any variations thereof, in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

As shown in fig. 1 to 14, the present invention provides a bone conduction sound generating unit, which includes a housing 1, a flexible member 2 connected to the housing 1, and a vibration sound generating module 3 disposed in the housing 1.

Referring to fig. 1 to 3, the housing 1 includes a first casing 10 and a second casing 11 connected to each other, wherein the first casing 10 includes a first plate 1a and two first side plates 1c connected to two sides of the first plate 1a, the second casing 11 includes a second plate 1b and two second side plates 1d connected to two sides of the second plate 1b, and the first plate 1a and the second plate 1b are disposed opposite to each other and in this embodiment, are parallel to each other. The first casing 10 and the second casing 11 are connected to each other through two first side plates 1c and two second side plates 1d, for example, by gluing, fastening, or welding, and after the connection is completed, the first casing 10 and the second casing 11 are matched to form an accommodating cavity 12.

In a preferred embodiment, the material of the housing 1 is plastic or metal.

Referring to fig. 4 to 6, a mounting hole 100 is formed in the upper end surface 14 of the housing 1, and the mounting hole 100 penetrates through the first plate 1a and communicates with the receiving cavity 12. The flexible member 2 is connected to the mounting hole 100 of the first housing 10, and it and the first housing 10 can be connected by gluing or welding, or can be molded on the first housing 10 by two-shot molding. The flexible member 2 is partially exposed to the outside of the housing 1 and partially exposed to the inside of the housing cavity 12. When the bone conduction sounding unit is used, the flexible part 2 is in contact with the skin of a human face to transmit vibration, and the flexible part 2 is softer than the shell 1, so that the touch feeling is more comfortable. The flexible member 2 is made of, for example, silicone, TPE, or rubber.

The vibration sound production module 3 is used for producing vibration and is arranged in the accommodating cavity 12. Vibration sound production module 3 one end links to each other with flexible 2, the other end and second plate body 1b elastic connection. Because the vibration sound production module 3 is non-fixed connection between upper and lower both ends and the shell 1, all has certain elasticity between the two, consequently, can play fine bradyseism effect, can not drive shell 1 vibration completely during vibration sound production module 3 vibrates, and the vibration volume of transmitting to shell 1 is littleer, can effectively reduce whole sense of shaking and sound leakage. In addition, the vibration can be directly transmitted to the face of a person through the flexible part 2, only less energy is transmitted to the shell 1, the vibration energy is more concentrated, the vibration sound production volume of the vibration sound production module 3 is favorably improved, and the sound pressure level (sensitivity) of the person hearing through the vibration transmission is improved.

In an embodiment, the flexible member 2 is made of silica gel, which has a good touch feeling and is beneficial to improving the wearing comfort. Further, the silica gel is hard silica gel, the hardness of which is 10-80 SHA, preferably 40-70 SHA, and more preferably 60 SHA. Referring to fig. 16 to 18, fig. 16 is a simulation diagram of a frequency response curve of the bone conduction sound emission unit when the flexible member 2 uses silicone rubber of different hardness, fig. 17 is an amplitude diagram of the whole bone conduction sound emission unit obtained by simulation when the flexible member 2 uses silicone rubber of different hardness, and fig. 18 is an enlarged view of a portion I in fig. 17. When the hardness of the silica gel is too low, although the sensitivity of the middle frequency band (800 Hz-1500 Hz) is still acceptable, the wearing experience of people is very poor due to too large amplitude, and the human body part in contact with the bone conduction sound production unit can feel obvious numbness and poor comfort; when the silica gel hardness is too large, although the amplitude becomes smaller, the wearing feeling of the human body is comfortable, the frequency response curve is attenuated in the middle frequency band and even the curve is distorted, and at the moment, the sound quality of the sound heard by the human body becomes poor, so that the final user experience is influenced. Through prescribing the silica gel hardness between 40 ~ 70SHA, the frequency response curve does not take place the distortion at the intermediate frequency, and tone quality guarantees easily, and bone conduction sound generating unit amplitude is less. Furthermore, when the hardness of the silica gel is 60SHA, the frequency response curve and the amplitude of the bone conduction sounding unit can be well balanced, and better tone quality and use experience can be obtained.

When the flexible member 2 is made of other materials, the hardness thereof is preferably within the above-mentioned preferred hardness range, and by properly defining the hardness of the flexible member 2, the flexible member 2 can have a good balance between the touch feeling and the cushioning effect.

In one embodiment, the vibration sound module 3 is partially embedded in the flexible member 2, so that the relative position of the vibration sound module 3 and the flexible member 2 can be limited while the flexible member 2 is in direct contact with the vibration sound module 3. As a possible structure, referring to fig. 6 to 8, the flexible member 2 is provided with a receiving groove 200, the shape of the receiving groove 200 is adapted to the shape of the end of the vibration sound module 3, and the upper end of the vibration sound module 3 is installed in the receiving groove 200. Preferably, the receiving groove 200 is tightly fitted to the upper end of the vibration sound module 3. Because the vibration sound production module 3 and the first plate body 1a are separated by the flexible part 2, the flexible part 2 can play a more sufficient and comprehensive cushioning effect. As a further improvement, the flexible element 2 includes a main body 20 extending into the accommodating cavity 12, and the accommodating slot 200 is disposed on an end surface 201 of the main body 20 facing the accommodating cavity 12. Further preferably, the upper end of the vibration sound production module 3 is lower than the height of the inner surface 104 of the first plate body 1a or is flush with the inner surface 104, so that the vibration is not directly transmitted to the first plate body 1a in the process of transmitting the vibration from the body part 20 in the transverse direction (X axis in the figure), and the vibration isolation effect is better.

As shown in fig. 4 and 5, the upper end surface 14 of the housing 1 is formed with a first mounting groove 101, a second mounting groove 102 is formed on a groove bottom surface 1010 of the first mounting groove 101, and the second mounting groove 102 extends to a position below the inner surface 104 of the first plate 1a and communicates with the receiving cavity 12, thereby forming the mounting hole 100. The flexible member 2 includes two protrusions 21 protruding from both sides of the body portion 20, and the body portion 20 and the protrusions 21 are respectively located in the first mounting groove 101 and the second mounting groove 102. Like this, can be so that the area of contact of flexible piece 2 and first casing 10 is bigger, and after it was connected through mode completion such as double-shot moulding, butt fusion or gluing with first casing 10, its was connected more firmly with first casing 10, is difficult for droing. Preferably, the first and second mounting

grooves

101 and 102 penetrate the front and rear end surfaces 15 and 16 of the housing 1, and referring to fig. 8, the vibration is not directly transmitted to the first plate body 1a during the transmission of the vibration from the body portion 20 in the longitudinal direction (Y axis in the drawing), further hindering the transmission of the vibration to the housing 1.

In a preferred embodiment, the surface 23 of the flexible element 2 intended to be in contact with the skin is flush with the upper end face 14 of the housing 1. In another preferred embodiment, referring to fig. 6, the surface 23 of the flexible element 2 for contacting the skin is a convex arc surface, and the surface 23 protrudes from the upper end surface 14 of the housing 1, so that on one hand, the thickness of the flexible element 2 can be increased, and on the other hand, the contact area of the flexible element 2 with the skin can be more concentrated.

As a preferred embodiment, referring to fig. 9 and 10, the bone conduction sound generating unit further includes a first elastic sheet 4, and the vibration sound generating module 3 is elastically connected to the housing 1 through the first elastic sheet 4. The first resilient piece 4 includes a support 40 and a first vibration arm 41 connected to the support 40, and the support 40 and the first vibration arm 41 are integrally formed. The support 40 is fixedly connected with the bottom of the vibration sound production module 3, the first vibration arm 41 extends outwards from the support 40, and the end part of the first vibration arm is connected with the shell 1. When the vibration sound production module 3 vibrates, the bracket 40 is fixed to the vibration sound production module 3, so that the bracket moves synchronously with the vibration sound production module 3, and the first vibration arm 41 elastically deforms along with the overall vibration of the vibration sound production module 3, thereby reducing the direct transmission of the overall vibration of the vibration sound production module 3 to the housing 1, and reducing the overall vibration of the housing 1. The material of the first elastic sheet 4 may be stainless steel, for example.

Referring to fig. 10, the first elastic sheet 4 includes four first vibration arms 41, and two first vibration arms 41 are symmetrically disposed on two sides of the support 40, so that the first elastic sheet 4 is more stable when vibrating. In other embodiments, one or more first vibration arms 41 may be symmetrically disposed on both sides of the support 40.

As a preferred embodiment, referring to fig. 5, 6 and 11, the second plate 1b is provided with at least two spaced supporting seats 13, and the supporting seats 13 are located in the receiving cavity 12 and protrude toward the side where the vibration sound module 3 is located. The end of the first vibrating arm 41 is fixedly connected to the support base 13. In other embodiments, the support base 13 may be provided at other positions, for example, two support bases 13 are provided at intervals on each of the two first side plates 1c of the first casing 10, and the ends of the four first vibrating arms 41 are connected to the four support bases 13, respectively.

The vibration sounding module 3 generally includes a stator and a mover that vibrates by the interaction of electromagnetic force between the mover and the stator. As a preferred embodiment, referring to fig. 12, the vibration sound module 3 includes an outer frame 30, a stator disposed in the outer frame 30, a second elastic sheet 32 connected to the outer frame 30, and a mover connected to the second elastic sheet 32. The outer frame 30 is connected to the flexible member 2 at the upper end thereof and is open at the lower end thereof. The stator includes a coil 310 and a first magnet 311 disposed in the coil 310, and both the coil 310 and the first magnet 311 are fixedly connected to the top plate 300 of the outer frame 30. The mover includes a second magnet 330 disposed opposite to the first magnet 311, and the magnetic poles of both magnets are arranged along the vibration axis of the mover and the same poles of both magnets are disposed opposite to each other, thereby forming a repulsive force therebetween. The outer frame 30 is made of a magnetic conductive material, and the attractive force between the second magnet 330 and the outer frame 30 is equal to the repulsive force between the first magnet 311 and the second magnet 330, and the attractive force is opposite to the repulsive force, so that the second magnet 330 is in a static equilibrium state and is more sensitive to the change of a magnetic field.

As shown in fig. 13, the second elastic sheet 32 includes an annular outer frame 320 connected to the outer frame 30, a central body 321 disposed in the outer frame 320, and a second vibration arm 322 connected between the outer frame 320 and the central body 321, the mover is connected to the central body 321, the coil 310 generates a changing magnetic field after being energized, so that the mover is driven by the changing acting force to vibrate under the driving of the magnetic field, during the vibration process, the second vibration arm 322 is elastically deformed to provide a restoring force, a vibration axis 3a of the mover is a vibration axis of the vibration sound module 3, and passes through the flexible member 2, preferably, an included angle between the vibration axis and a normal of the upper end surface 14 of the housing 1 or a normal of the surface 23 of the flexible member 2 for contacting with the skin is in a range of 0 to 30 ° (the upper end surface 14 and the normal of the surface 23 may be a plane or an arc, and when the plane is the plane, an included angle between the vibration axis and the plane is a fixed value of 0 to 30 °, when the arc surface is adopted, the included angles between the vibration axis and the normal of each point on the arc surface are all between 0 and 30 degrees). Referring to fig. 14 and 15, the bracket 40 of the first resilient tab 4 is connected to the bottom of the outer frame 320, for example, by gluing or welding. Since the central body 321 and the second vibration arm 322 of the first elastic sheet 4 move up and down in the vibration process and protrude to the lower end of the outer frame 30, the bracket 40 is provided with an avoiding hole 400 for avoiding the vibration of the central body 321 and the second vibration arm 322.

The first elastic piece 4 and the second elastic piece 32 may be integrated, and in the integrated condition, the overall thickness of the first elastic piece 4 and the second elastic piece 32 can be further reduced, referring to fig. 10, the support 40 of the first elastic piece 4 is annular, the first elastic piece 4 further includes a central body 321 arranged in the support 40 and a second vibrating arm 322 connected between the support 40 and the central body 321, and the mover is connected to the central body 321. In this way, the bracket 40 and the outer frame 320 are integrated into one piece, and the overall structure is more compact.

In order to prevent the vibration sound-generating module 3 from being damaged due to too large vibration displacement or artificial pressing of the flexible member, as shown in fig. 6 and 11, a limiting boss 110 is further disposed below the vibration sound-generating module 3, preferably, the limiting boss 110 is disposed on the second plate body 1b, protrudes toward the vibration sound-generating module 3, and is located between the two supporting seats 13. The spacing boss 110 and the first elastic sheet 4 have a vibration space 5 therebetween to allow the vibration sound generating module 3 to vibrate and move in a certain area. Because the distance between the vibration sound production module 3 and the limiting boss 110 is greater than the distance between the vibration sound production module and the second plate body 1b, the limiting boss 110 can limit the maximum displacement of the vibration sound production module 3, and the vibration sound production module 3 is prevented from being damaged due to overlarge displacement when falling, impacting and the like. Furthermore, a flexible pad can be attached to the upper surface of the limiting boss 110 and/or the lower surface of the central body 321 to play a role of buffering.

The invention also provides a wearable device, such as a bone conduction earphone, a bone conduction glasses and the like, which is provided with the bone conduction sound production unit.

When the wearable device is bone conduction glasses, preferably, the housing 1 and the vibration sound production module 3 are long, and the housing 1 can be used as a glasses leg of the bone conduction glasses, so that the bone conduction sound production unit can be conveniently combined to the bone conduction glasses as a part of the glasses frame. When bone conduction glasses are worn on the head, the flexible parts 2 are clamped on two sides of the head of a person and attached to the skin of the face, so that efficient vibration sound transmission is achieved, meanwhile, the vibration quantity of the shell 1 sensed by the face of the person is small, the whole vibration sense of the glasses is weak, and the glasses are comfortable to wear.

The above is only a specific embodiment of the present invention, and any other modifications based on the concept of the present invention are considered as the protection scope of the present invention.

Claims

1. A bone conduction sound generating unit, comprising:

the shell (1) comprises an accommodating cavity (12), and a mounting hole (100) communicated with the accommodating cavity (12) is formed in the upper end surface (14) of the shell (1);

the flexible piece (2) is connected in the mounting hole (100) of the shell (1); and the number of the first and second groups,

vibration sound production module (3) is located accept in chamber (12), vibration sound production module (3) one end with flexible piece (2) link to each other, the other end with shell (1) elastic connection.

2. The bone conduction sound generating unit according to claim 1, wherein the flexible member (2) is made of silicone, rubber or TPE, and the hardness of the flexible member (2) is 10 to 80 SHA.

3. The bone conduction sound emitting unit of claim 2, wherein the silicone has a hardness of 40 to 70 SHA.

4. Bone conduction sound-emitting unit according to claim 1, characterized in that the flexible element (2) is provided with a receiving groove (200), the vibrating sound-emitting module (3) being end-fitted in the receiving groove (200).

5. The bone conduction sound emitting unit according to claim 4, wherein the flexible member (2) comprises a body portion (20) extending into the receiving cavity (12), and the receiving groove (200) is provided on an end surface (201) of the body portion (20) facing the receiving cavity (12).

6. The bone conduction sound emitting unit according to claim 5, wherein the flexible member (2) includes a protrusion (21) protruding from a side surface of the body portion (20), the upper end surface (14) of the housing (1) is formed with a first mounting groove (101) and a second mounting groove (102) formed on a groove bottom surface (1010) of the first mounting groove (101), the first mounting groove (101) and the second mounting groove (102) both penetrate through a front end surface (15) and a rear end surface (16) of the housing (1), the body portion (20) is disposed in the first mounting groove (101), and the protrusion (21) is disposed in the second mounting groove (102).

7. Bone conduction sound-emitting unit according to claim 1, characterized in that the flexible element (2) is flush with the upper end surface (14) of the housing (1) or that the flexible element (2) protrudes from the upper end surface (14) of the housing (1).

8. Bone conduction sound emitting unit according to claim 1, wherein the angle between the axis of vibration of the vibrating sound emitting module (3) and the normal of the upper end surface (14) of the housing (1) or the normal of the surface (23) of the flexible member (2) intended to be in contact with the skin of a human being is in the range of 0-30 °.

9. Bone conduction sound emitting unit according to any of claims 1 to 8, further comprising a first spring plate (4), the first spring plate (4) comprising a bracket (40) connected to the vibrating sound emitting module (3) and a first vibrating arm (41) connected between the bracket (40) and the housing (1).

10. Bone conduction sound-emitting unit according to claim 9, characterized in that the housing (1) is provided with at least two spaced apart seats (13), the first vibrating arm (41) being connected to the seats (13).

11. The bone conduction sound emitting unit according to claim 10, wherein the housing (1) comprises a first plate body (1a) and a second plate body (1b) which are oppositely arranged, the receiving cavity (12) is located between the first plate body (1a) and the second plate body (1b), the flexible member (2) is connected to the first plate body (1a), and the supporting seat (13) is arranged on the second plate body (1 b).

12. Bone conduction sound-emitting unit according to claim 11, characterized in that the second plate (1b) is further provided with a limiting boss (110) protruding towards the vibration sound-emitting module (3), and a vibration space (5) is provided between the limiting boss (110) and the vibration sound-emitting module (3).

13. The bone conduction sound-generating unit according to claim 9, wherein the vibration sound-generating module (3) includes an outer frame (30) with an open end, a stator disposed in the outer frame (30), a second elastic sheet (32) connected to the open end of the outer frame (30), and a mover connected to the second elastic sheet (32), the second elastic sheet (32) includes an outer frame body (320) connected to the outer frame (30), a central body (321) disposed in the outer frame body (320), and a second vibration arm (322) connected between the outer frame body (320) and the central body (321), the mover is connected to the central body (321), and the support (40) is provided with an avoiding hole (400) for avoiding the vibration of the central body (321) and the second vibration arm (322).

14. The bone conduction sound-generating unit according to claim 9, wherein the vibration sound-generating module (3) comprises an outer frame (30) with an open end, and a stator and a rotor arranged in the outer frame (30), the support (40) is connected to the open end of the outer frame (30), the support (40) is annular, the first elastic piece (4) comprises a central body (321) arranged in the support (40) and a second vibration arm (322) connected between the support (40) and the central body (321), and the rotor is connected to the central body (321).

15. A wearable device comprising the bone conduction sound emitting unit of any one of claims 1 to 14.