CN217656712U - Bone conduction sound generating unit and wearable equipment - Google Patents

Abstract

The utility model discloses a bone conduction sound producing unit and wearable equipment, this bone conduction sound producing unit include first casing, second casing and vibration unit. The first housing includes a panel. The second shell is connected with the first shell, and an accommodating cavity is formed between the first shell and the second shell. The vibration unit is arranged in the accommodating cavity, and the vibration unit is fixedly connected with the panel and is not contacted with the second shell. The utility model discloses a bone conduction sound production unit volume is bigger, and it is littleer to leak the sound.

Description

Bone conduction sound production unit and wearable equipment

Technical Field

The utility model relates to an acoustics device especially relates to a osteoacusis sound generating unit and wearable equipment.

Background

Bone conduction is a sound conduction mode, namely, sound is converted into mechanical vibration with different frequencies, sound waves are transmitted through media such as human skull, and sound transmission through external air is not needed. The bone conduction technology is widely applied to wearable devices such as bone conduction earphones and bone conduction glasses. The bone conduction omits a plurality of sound wave transmission steps, can realize clear sound restoration in a noisy environment, and has wide application prospect because the sound waves can not influence other people because of diffusion in the air.

The bone conduction sound generating unit generally has two shells, a containing cavity is formed between the two shells, and the vibration unit is contained in the containing cavity. When the human face vibration absorber works, one of the two shells is attached to the human face to transmit vibration, and the other shell faces away from the human face. Two casings of present bone conduction sound producing unit all contact with the vibration unit, and both are pushed down the both ends of vibration unit respectively, and such assembly method for the vibration unit will drive two casing vibrations, forms the pendulum of a big quality, and the bone conduction sound that leads to the people's ear to hear is on the small side, simultaneously because whole system vibration can lead to leaking the sound serious.

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

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a osteoacusis sound generating unit and wearable equipment can improve the volume, reduce the sound leakage.

In order to realize the above-mentioned utility model purpose, on the one hand, the utility model provides a bone conduction sound generating unit, include:

a first housing including a panel;

the second shell is connected with the first shell, and an accommodating cavity is formed between the first shell and the second shell; and the number of the first and second groups,

and the vibration unit is arranged in the accommodating cavity, is fixedly connected with the panel and is not contacted with the second shell.

Further, the vibration unit is in snap-fit connection with the first housing.

Furthermore, the first shell comprises two hooks respectively positioned at two ends of the vibration unit, the hooks comprise vertical plates connected with the panel and first hook parts connected with the vertical plates, and two ends of the vibration unit are respectively clamped between the first hook parts of the two hooks and the panel.

Further, the vibration unit is clamped between the vertical plates of the two clamping hooks.

Further, the first shell comprises a first side plate and a second side plate which are respectively connected to two sides of the panel, the first side plate and/or the second side plate is/are provided with second hook parts protruding into the accommodating cavity, and the vibration unit is clamped between the two second hook parts and the panel.

Further, the clamping hook is connected with the first side plate and/or the second side plate.

Furthermore, the bone conduction sound generating unit further comprises a pressing plate connected with the first shell, and the vibration unit is clamped between the pressing plate and the panel.

Furthermore, the first shell comprises two upright posts respectively positioned at two ends of the vibration unit, and the pressing plate is fixedly connected to the two upright posts.

Further, the vibration unit includes one end open-ended frame, locates stator in the frame, connect in the shell fragment of the open end of frame and with the active cell that the shell fragment links to each other, the shell fragment include with the outer support that the frame links to each other, locate lamellar body in the outer support and connect in the outer support with bullet arm between the lamellar body, the active cell connect in on the lamellar body, the open end orientation of frame the second casing sets up, the clamp plate is equipped with dodges the lamellar body with the hole of dodging of bullet arm vibration.

Furthermore, the first shell further comprises a silica gel layer arranged on the panel, and the area where the silica gel layer is located corresponds to the vibration unit;

the silica gel layer and the vibration unit are separated through the panel; or, the panel is provided with a through hole, and the silica gel layer part is positioned in the through hole and contacted with the vibration unit.

Furthermore, the included angle between the vibration axis of the vibration unit and the normal of the first outer surface of the panel facing the skin or the normal of the second outer surface of the silica gel layer contacting the skin of the human body ranges from 0 to 30 degrees.

Further, the hardness of the silica gel layer is 10-80 SHA.

Further, the outer surface on silica gel layer with the panel parallel and level or protrusion in the panel.

On the other hand, the utility model provides a wearable equipment, include as above any one bone conduction sound generating unit.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. through setting the vibration unit to the panel with first casing and link to each other and not contact with the second casing, can make the vibration that the vibration unit produced mainly concentrate on the panel, will vibrate transmission to the human body by the panel, because vibration mainly concentrates on the one side that bone conduction sound generating unit is close to the people's face, consequently, be favorable to improving the volume that bone conduction sound generating unit sent, and simultaneously, bone conduction sound generating unit's bulk vibration is littleer, the sound leakage because the bulk vibration produces has been reduced, promote user experience, in addition, the required energy of vibration is littleer, it is more energy-conserving.

2. As the improvement, the vibration unit is connected to the shell in a buckling connection mode or a pressing plate fixing mode, and the installation is more convenient.

3. As the improvement, first casing still is equipped with and is located the panel and just with the silica gel layer that the vibration unit position corresponds, the silica gel layer be used for with the contact of human skin, the transmission vibration, can increase the travelling comfort of using on the one hand, on the other hand can play the bradyseism effect, has reduced bone conduction sound producing unit's whole vibration, can further reduce the sound leakage.

Drawings

Fig. 1 is a schematic structural diagram of a bone conduction sound generating 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 schematic structural view of a first housing of the bone conduction sound unit shown in fig. 1.

Fig. 4 is a plan view of the bone conduction sound emitting unit shown in fig. 1.

Fig. 5 isbase:Sub>A sectional view taken along section linebase:Sub>A-base:Sub>A in fig. 4.

Fig. 6 is a structural diagram of the first housing of the bone conduction sound generating unit shown in fig. 1 in another viewing direction.

Fig. 7 is a front view of the bone conduction sound emitting unit shown in fig. 1.

Fig. 8 is a sectional view taken along section line B-B in fig. 7.

Fig. 9 is a sectional view of the first housing according to an embodiment of the present invention, in which both side portions of the hook are connected to the first side plate and the second side plate.

Fig. 10 is a cross-sectional view of the first housing according to an embodiment of the present invention, in which both sides of the hook are connected to the first side plate and the second side plate.

Fig. 11 is a cross-sectional view of a bone conduction sound unit according to an embodiment of the present invention, in which a vibration unit is fixed by a pressing plate.

Fig. 12 is an enlarged view of a portion I in fig. 11.

Fig. 13 is a structural diagram of the bone conduction sound unit shown in fig. 11 in a bottom view, without showing the second housing.

Fig. 14 is a schematic structural view of a spring plate according to an embodiment of the present invention.

Fig. 15 is a schematic structural view of a pressing plate according to an embodiment of the present invention.

Fig. 16 is a schematic structural view of a first housing according to an embodiment of the present invention, in which a panel is provided with a through hole.

Fig. 17 is a cross-sectional view of a bone conduction sound unit according to an embodiment of the present invention, in which a vibration unit is in contact with a silicone layer.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below. 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 associated with the present application are shown in the drawings, not all of them. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to 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 listed, but may alternatively include other steps or elements not 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 and fig. 2, the present invention provides a bone conduction sound generating unit, which includes a first housing 1, a second housing 2 and a vibration unit 4.

As shown in fig. 3, the first housing 1 includes a panel 10, and when a device (e.g., a wearable device such as a bone conduction headset or bone conduction glasses) having the bone conduction sound generating unit is used, a first outer surface 103 of the panel 10 faces a human face and can transmit vibration when it is in contact with the skin.

The second housing 2 is connected to the first housing 1, and a housing chamber 3 is formed between the first housing 1 and the second housing 2. The vibration unit 4 is disposed in the receiving cavity 3, and the vibration unit 4 is fixedly connected to the panel 10 and does not contact the second housing 2.

Referring to fig. 5 and 9, since the vibration unit 4 is disposed on the panel 10, the second housing 2 does not directly participate in fixing the vibration unit 4, therefore, the vibration generated by the vibration unit 4 will be mainly concentrated on the panel 10 of the first housing 1, and the vibration is transmitted to the human body by the panel 10, since the vibration is mainly concentrated on one side of the bone conduction sound generating unit close to the human face, it is beneficial to increase the volume emitted by the bone conduction sound generating unit, and meanwhile, the overall vibration of the bone conduction sound generating unit is smaller, and the sound leakage due to the overall vibration is reduced.

As a preferred embodiment, the material of the first casing 1 and the second casing 2 may be any one of PC, PC + ABS, PC + fiberglass, PA + fiberglass, and PPA + fiberglass, and the material of the first casing 1 and the second casing 2 may be the same or different.

In order to make the influence of the vibration generated by the vibration unit 4 on the second housing 2 smaller, referring to fig. 3, the first housing 1 further includes a first side plate 11 and a second side plate 12 respectively connected to both sides of the panel 10, and the first side plate 11 and the second side plate 12 are preferably arranged in parallel. The second casing 2 is connected to the bottom of the first side plate 11 and the second side plate 12. Since the first side plate 11 and the second side plate 12 make the distance between the panel 10 and the second housing 2 longer, the vibration of the entire bone conduction sound emitting unit caused by the vibration of the vibration unit 4 can be further reduced, the sound volume can be further increased, and the sound leakage can be reduced. A buffer layer can also be provided between the first housing 1 and the second housing 2 to further reduce the effect of vibrations on the second housing 2.

The connection between the vibration unit 4 and the panel 10 is not limited, for example, the vibration unit 4 may be fixed on the panel 10 by a snap connection, or fixed on the panel 10 by pressing the pressing plate 5, or fixed by a heat-melting column. Two embodiments of the connection by means of a snap connection and the pressure plate 5 are described below.

Referring to fig. 4-6, an embodiment of a snap-fit connection is shown. In this embodiment, the first housing 1 includes two hooks 17 respectively located at two ends of the vibration unit 4, the hooks 17 include a vertical plate 170 connected to the panel 10 and a first hook 171 connected to the vertical plate 170, and the first hook 171 protrudes toward a position where the other first hook 171 is located. Preferably, the two hooks 17 are symmetrically arranged. Both end portions of the vibration unit 4 are clamped between the first hook 171 and the panel 10. In this way, the vibration unit 4 can be fixed to the panel 10 by the hook 17.

As a preferred embodiment, two ends of the vibration unit 4 are clamped between the vertical plates 170 of the two hooks 17, so that the hooks 17 can fix the vibration unit 4 more firmly.

As a preferred embodiment, referring to fig. 6 to 8, the first side plate 11 and the second side plate 12 are provided with a second hook 14 protruding into the receiving cavity 3, and the vibration unit 4 is clamped between the second hook 14 and the panel 10. Therefore, the periphery of the vibration unit 4 is fixed on the panel 10 through the buckles, and the fixing effect is better. It is understood that the second hook 14 may be provided on only one of the first side plate 11 and the second side plate 12.

As a preferred embodiment, the two sides of the hook 17 are connected with the first side plate 11 and the second side plate 12, so that the rigidity is stronger, the vibration unit 4 is not easy to loosen due to elastic deformation during vibration, the reliability of fixing the vibration unit 4 is better, and the sound quality of the bone conduction sound production unit is favorably ensured. Referring to fig. 9, the side of the hook 17 may be partially connected to the first and second side plates 11 and 12 with a gap 172 between the first and second side plates 11 and 12 at a portion near the first hook 171 to facilitate the vibration unit 4 to be caught in the hook 17. Referring to fig. 6 and 10, the sides of the hook 17 may also be connected to the first side plate 11 and the second side plate 12 entirely to make the hook 17 more rigid. It is understood that the hook 17 may be connected to only the first side plate 11 or the second side plate 12.

As a preferred embodiment, the first casing 1 is integrally injection-molded, that is, the panel 10, the first side plate 11, the second side plate 12, the hook 17 and the second hook 14 are integrally injection-molded.

Referring to fig. 11 to 14, fig. 11 to 14 show an embodiment in which the vibration unit 4 is connected by the pressing plate 5, and the vibration unit 4 is clamped between the pressing plate 5 and the panel 10. The first shell 1 comprises two upright posts 15 respectively positioned at two ends of the vibration unit 4, the upright posts 15 are connected with the panel 10, the first side plate 11 and the second side plate 12, and the pressing plate 5 is fixedly connected on the two upright posts 15 through bolts 6. Specifically, referring to fig. 12, a threaded hole 150 is provided on the pillar 15, bolt holes 51 are provided at two end portions of the pressing plate 5, and bolts 6 pass through the bolt holes 51 and are screwed with the threaded holes 150, so as to fix the pressing plate 5 and the pillar 15, and at the same time, the pressing plate 5 presses the vibration unit 4 onto the panel 10. It will be appreciated that although the upright 15 is connected to the panel 10, the first side panel 11 and the second side panel 12 in this embodiment, in other embodiments, the upright 15 may be connected to one or both of the panel 10, the first side panel 11 and the second side panel 12.

As a preferred embodiment, the first casing 1 is integrally injection molded, i.e. the panel 10, the first side plate 11, the second side plate 12 and the pillar 15 are all integrally injection molded.

The structure of the vibration unit 4 is not limited, and it is preferable that the stator of the vibration unit 4 is closer to the panel 10 than the mover. In the case of the vibration unit 4 in which the mover or the elastic piece 42 of the vibration unit 4 protrudes out of the outer frame 40 of the vibration unit 4 when vibrating, the pressing plate 5 should be provided with an escape hole 50 for escaping from the elastic piece 42 or the mover.

Referring to fig. 5, 8, 11, and 12, the vibration unit 4 of the illustrated embodiment includes an outer frame 40 having one end opened, a stator provided in the outer frame 40, a spring 42 connected to the open end of the outer frame 40, and a mover connected to the spring 42. The stator includes a coil 410 coupled to the top plate 400 of the outer frame 40 and a first magnet 411, and the first magnet 411 is disposed in the coil 410. The mover includes a second magnet 430 disposed opposite to the first magnet 411, and the first magnet 411 and the second magnet 430 are disposed opposite to each other with the same polarity, with a repulsive force therebetween. The outer frame 40 is made of a magnetic conductive material, and the attractive force between the second magnet 430 and the outer frame 40 is equal to and opposite to the repulsive force between the first magnet 411 and the second magnet 430, so that the second magnet 430 is in a static equilibrium state.

As shown in fig. 14, the elastic sheet 42 includes an annular outer frame 420 connected to the outer frame 40, a sheet 421 disposed in the outer frame 420, and a plurality of elastic arms 422 connected between the outer frame 420 and the sheet 421, the mover is connected to the sheet 421, the top plate 400 of the outer frame 40 is attached to the panel 10, and the open end of the top plate faces the second housing 2. By controlling the current and voltage applied to the coil 410, a changing magnetic field can be generated to drive the second magnet 430 to vibrate, and after the second magnet 430 deviates from the equilibrium position, the elastic arm 422 of the elastic sheet 42 can provide an elastic force for driving the second magnet 430 to reset.

Referring to fig. 13 and 15, since the spring 42 is provided at the opening end of the outer frame 40, the spring arm 422 and the sheet 421 of the spring 42 will protrude outward when the mover vibrates. The pressing plate 5 is provided with an avoidance hole 50 corresponding to the sheet body 421 and the elastic arm 422 so as to avoid when the sheet body 421 and the elastic arm 422 move. The pressing plate 5 is in contact with the outer supporter 420 of the elastic piece 42, thereby fixing the vibration unit 4 to the panel 10.

As a preferred embodiment, the first casing 1 further comprises a silicone layer 16 disposed on the panel 10, the silicone layer 16 is located in a region corresponding to the vibration unit 4, and a first projection of the silicone layer 16 on the panel 10 along the vibration axis C of the vibration unit 4 and a second projection of the vibration unit 4 on the panel 10 along the vibration axis C thereof at least partially overlap. Preferably, the first projection and the second projection are completely coincident. It is further preferable that the second projection is located inside the first projection, and the area of the silicone layer 16 is larger than the sectional area of the vibration unit 4 (refer to fig. 5 and 11).

The silicone layer 16 is used for contacting with human skin, and can provide more comfortable touch feeling and better use comfort. Meanwhile, the vibration of the vibration unit 4 is concentrated at the silica gel layer 16, and the silica gel layer 16 can play a role in cushioning, so that the overall vibration of the bone conduction sounding unit is reduced, and the sound leakage can be further reduced.

In a preferred embodiment, the silicone layer 16 is not in contact with the vibration unit 4, and referring to fig. 5, the silicone layer 16 and the vibration unit 4 are respectively located on both sides of the panel 10, and are separated by the panel 10. In another preferred embodiment, the silicone layer 16 is in contact with the vibration unit 4, and referring to fig. 16 and 17, a through hole 100 is formed in the panel 10, and the silicone layer 16 is partially located in the through hole 100 and in contact with the vibration unit 4, in this embodiment, since the vibration unit 4 is in direct contact with the silicone layer 16, and the thickness of the silicone layer is larger, the cushioning effect is better.

The hardness of the silicone gel layer 16 is preferably 10 to 80SHA, more preferably 40 to 70SHA, and still more preferably 60SHA. When the hardness of the silica gel layer 16 is small, the amplitude of the bone conduction sounding unit is too large, the comfort in use is poor, and when the hardness of the silica gel layer 16 is large, although the amplitude of the bone conduction sounding unit is reduced, the frequency response curve of the bone conduction sounding unit is attenuated in a middle frequency band and even distorts, and the tone quality is adversely affected. When the hardness of the silica gel layer 16 is 40-70 SHA, the frequency response curve is not distorted in the middle frequency band, the tone quality is easy to guarantee, and the amplitude of the bone conduction sounding unit is small. 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.

The silicone layer 16 may be fixed to the panel 10 by adhesion or may be molded on the panel 10 by two-shot molding. In order to make the silicone gel layer 16 more firmly bonded to the panel 10, the silicone gel layer 16 is at least partially embedded in the panel 10. Referring to fig. 16, a first groove 101 and two second grooves 102 opened on the bottom surface of the first groove 101 are formed on the first outer surface 103 of the faceplate 10, and the silicone layer 16 is embedded in the first groove 101 and the second grooves 102, so that the connection between the silicone layer and the faceplate 10 is firmer.

In a preferred embodiment, the silicone layer 16 is embedded in the faceplate 10 with its outer surface flush with the faceplate 10. In another preferred embodiment, referring to fig. 1, the silicone layer 16 is embedded in the panel 10 and protrudes from the first outer surface 103 of the panel 10 to make it more convenient to contact with the skin, and preferably, the second outer surface 160 of the silicone layer 16 for contacting with the skin of a human body is a convex arc.

As a preferred embodiment, the angle between the vibration axis C of the vibration unit 4 (the vibration axis of the vibration unit 4 is the same as the vibration axis of its mover) and the normal of the first outer surface 103 of the faceplate 10 or the normal of the second outer surface 160 of the silicone layer 16 for contact with the skin of a human body is in the range of 0 to 30 °. It is understood that the first outer surface 103 and the second outer surface 160 may be a plane or an arc, and when the plane is a plane, the angle between the vibration axis C and the normal of the plane is a constant value between 0 ° and 30 °, and when the arc is an arc, the angle between the vibration axis C and the normal of each point on the arc is between 0 ° and 30 °.

The utility model also provides a wearable equipment, this wearable equipment for example be bone conduction earphone, bone conduction glasses etc. it is equipped with the above bone conduction sound generating unit.

When wearable equipment is bone conduction glasses, preferably, first casing 1, second casing 2 and vibration unit 4 are rectangular form, and the combination of first casing 1 and second casing 2 can be regarded as the mirror leg of bone conduction glasses, and the bone conduction sound generating unit of being more convenient for combines to bone conduction glasses on, and when bone conduction glasses wore behind the head, two mirror legs centre gripping people's head both sides to the sound is passed in the efficient vibration.

The above-mentioned is only the embodiment of the present invention, and other improvements made on the premise of the concept of the present invention are all regarded as the protection scope of the present invention.

Claims (14)

1. A bone conduction sound generating unit, comprising:

a first housing (1) comprising a panel (10);

the second shell (2) is connected with the first shell (1), and an accommodating cavity (3) is formed between the first shell (1) and the second shell (2); and the number of the first and second groups,

the vibration unit (4) is arranged in the accommodating cavity (3), and the vibration unit (4) is fixedly connected with the panel (10) and is not contacted with the second shell (2).

2. Bone conduction sound emitting unit according to claim 1, characterized in that the vibration unit (4) is snap-connected with the first housing (1).

3. The bone conduction sound generating unit according to claim 2, wherein the first housing (1) comprises two hooks (17) respectively located at two ends of the vibration unit (4), the hooks (17) comprise a vertical plate (170) connected to the panel (10) and a first hook (171) connected to the vertical plate (170), and two ends of the vibration unit (4) are respectively clamped between the first hooks (171) of the two hooks (17) and the panel (10).

4. Bone conduction sound-emitting unit according to claim 3, characterized in that the vibrating unit (4) is clamped between the uprights (170) of the two hooks (17).

5. The bone conduction sound emitting unit according to claim 3, wherein the first housing (1) comprises a first side plate (11) and a second side plate (12) connected to both sides of the panel (10), respectively, the first side plate (11) and/or the second side plate (12) being provided with a second hook (14) protruding into the receiving cavity (3), the vibration unit (4) being clamped between the two second hooks (14) and the panel (10).

6. Bone conduction sound emitting unit according to claim 5, characterized in that the catch (17) is connected to the first side plate (11) and/or the second side plate (12).

7. Bone conduction sound-emitting unit according to claim 1, characterized in that it further comprises a pressure plate (5) connected to the first housing (1), the vibration unit (4) being clamped between the pressure plate (5) and the face plate (10).

8. Bone conduction sound-emitting unit according to claim 7, characterized in that the first housing (1) comprises two uprights (15) at each end of the vibration unit (4), the pressure plate (5) being fixedly connected to both of the uprights (15).

9. The bone conduction sound generating unit according to claim 7, wherein the vibration unit (4) includes an outer frame (40) with an open end, a stator arranged in the outer frame (40), an elastic sheet (42) connected to the open end of the outer frame (40), and a mover connected to the elastic sheet (42), the elastic sheet (42) includes an outer frame (420) connected to the outer frame (40), a sheet body (421) arranged in the outer frame (420), and an elastic arm (422) connected between the outer frame (420) and the sheet body (421), the mover is connected to the sheet body (421), the open end of the outer frame (40) faces the second housing (2) and is disposed, and the pressing plate (5) is provided with an avoiding hole (50) for avoiding the sheet body (421) and the elastic arm (422) to vibrate.

10. The bone conduction sound emitting unit according to any one of claims 1 to 9, wherein the first housing (1) further comprises a silicone layer (16) provided on the face plate (10), the silicone layer (16) being located in an area corresponding to the vibration unit (4);

the silica gel layer (16) and the vibration unit (4) are separated by the panel (10); or the panel (10) is provided with a through hole (100), and the silica gel layer (16) is partially positioned in the through hole (100) and is in contact with the vibration unit (4).

11. Bone conduction sound-emitting unit according to claim 10, wherein the angle between the axis of vibration of the vibration unit (4) and the normal of the first outer surface (103) of the face plate (10) facing the skin or the normal of the second outer surface (160) of the silicone layer (16) for contact with the skin of a human being is in the range of 0 to 30 °.

12. The bone conduction sound emitting unit according to claim 10, wherein the hardness of the silicone layer (16) is 10 to 80SHA.

13. The bone conduction sound emitting unit according to claim 10, wherein the outer surface of the silicone layer (16) is flush with the faceplate (10) or protrudes from the faceplate (10).

14. A wearable device comprising the bone conduction sound emitting unit of any one of claims 1 to 13.

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