CN219812242U - Bone conduction earphone - Google Patents

Abstract

The utility model relates to a bone conduction earphone, which comprises a shell and a bone conduction module, wherein the shell defines a mirror leg accommodating space communicated with two sides of the shell in a first direction, the shell comprises a skin-approaching wall, the skin-approaching wall and the mirror leg accommodating space are adjacently arranged in a second direction, the skin-approaching wall is provided with a skin-approaching surface facing away from the mirror leg accommodating space, the skin-approaching surface comprises a top layer skin-approaching surface and a bottom layer skin-approaching surface which are arranged on two sides of the top and bottom of the mirror leg accommodating space, the bone conduction module is arranged on the shell and transmits sound vibration by utilizing the bottom layer skin-approaching surface, when the bone conduction earphone is used, the top layer skin-approaching surface and the bottom layer skin-approaching surface are respectively arranged on two sides of the top and bottom of the mirror leg, and the ratio of the length of the top layer skin-approaching surface in the third direction perpendicular to the first direction and the second direction to the length of the bottom layer skin-approaching surface in the third direction is more than or equal to 1:4 and less than or equal to 1:1, so that a lever and a fulcrum are formed, and the bone conduction earphone is prevented from rotating around the mirror leg as a shaft, and the bone conduction earphone can keep good contact with the skin of a user.

Description

Bone conduction earphone

Technical Field

The utility model relates to the field of earphones, in particular to a bone conduction earphone.

Background

In order to facilitate users to wear glasses and use bone conduction headphones, bone conduction headphones capable of being hung on the glasses legs of the glasses appear in the market, but the bone conduction headphones are easy to be influenced by external force and rotate by taking the glasses legs as shafts, so that the bone conduction headphones are in poor contact with the skin of the users, sound vibration cannot be well transmitted, the quality of sound is good, and the user experience is poor.

Disclosure of Invention

The technical problem to be solved by the embodiment of the utility model is to provide the bone conduction earphone, so as to solve the problem that the bone conduction earphone hung on the glasses legs of the glasses in the prior art is easily influenced by external force and rotates by taking the glasses legs as axes, so that the bone conduction earphone is in poor contact with the skin of a user.

The bone conduction earphone provided by the embodiment of the utility model comprises: the device comprises a shell, a lens and a lens, wherein the shell defines a glasses leg accommodating space communicated with spaces on two sides of the shell in a first direction, the shell comprises a skin-approaching wall, and the skin-approaching wall and the glasses leg accommodating space are adjacently arranged in a second direction; the skin-approaching wall is provided with a skin-approaching surface far away from the glasses leg accommodating space, the skin-approaching surface comprises a top layer skin-approaching surface and a bottom layer skin-approaching surface which are arranged on the top side and the bottom side of the glasses leg accommodating space in a layered manner when seen from a second direction, and the ratio of the length of the top layer skin-approaching surface in a third direction to the length of the bottom layer skin-approaching surface in the third direction is more than or equal to 1:4 and less than or equal to 1:1, wherein the second direction is perpendicular to the first direction, and the third direction is perpendicular to the first direction and the second direction; and the output end of the bone conduction module is connected with the skin-approaching wall and is opposite to the bottom skin-approaching surface in a second direction so as to transmit sound vibration by using the bottom skin-approaching surface.

Further, the housing includes a first housing and a second housing, the temple receiving space is defined by the first housing or the first housing and the second housing, and the first housing is rotatably connected with the second housing, so that when the first housing rotates in a direction away from the second housing, a temple access opening communicating with the temple receiving space is formed between the first housing and the second housing.

Further, the housing includes a third housing and a fourth housing, the fourth housing is slidably mounted on top of the third housing, the temple receiving space is defined by the fourth housing and the third housing, and the fourth housing is capable of sliding in a direction approaching and departing from the third housing so as to adjust the size of the temple receiving space.

Further, the third housing includes the near-skin wall, near-skin wall dorsad the position of the near-skin face of bottom is equipped with towards the installation department that the second direction extends, bone conduction module install in installation department, the fourth housing slidable install in near-skin wall dorsad the position of the near-skin face of top layer, just the fourth housing can be towards being close to and keeping away from the direction of installation department removes, in order to adjust the size of mirror leg accommodation space.

Further, the bone conduction earphone further comprises a spring, a containing groove arranged along a third direction is formed in one side, facing the skin approaching wall, of the fourth shell, a first protruding portion is arranged on one side, facing the fourth shell, of the skin approaching wall, the first protruding portion stretches into the containing groove, the containing groove comprises a groove wall close to the mounting portion, and the spring is arranged between the groove wall and the first protruding portion.

Further, the mounting portion includes a top surface facing the fourth housing, the top surface having a recess recessed in a direction away from the fourth housing at a position adjacent to the skin proximal wall, the recess for receiving the temple.

Further, an anti-slip layer is arranged on one surface of the mounting part facing the fourth shell, and/or an anti-slip layer is arranged on one surface of the fourth shell facing the mounting part; wherein the anti-slip layer is made of an elastic material.

Further, the shell further comprises a back skin surface, the back skin surface and the near skin surface are arranged in a back mode, grooves communicated with two side surfaces adjacent to the back skin surface are formed in the back skin surface, and the accommodation space of the glasses leg is defined by the walls of the grooves.

Further, the groove comprises a first groove section and a second groove section, the first groove section is arranged on the back skin surface and extends towards the direction close to the skin surface, and the second groove section is communicated with one side, close to the skin surface, of the first groove section and bends towards one side, close to the skin surface, of the top layer, away from the skin surface close to the bottom layer.

Further, a second protruding portion is arranged on the skin-near surface of the bottom layer, and the output end of the bone conduction module is connected with the second protruding portion, so that the bone conduction module can transmit sound vibration by utilizing the second protruding portion.

Compared with the prior art, the bone conduction earphone provided by the embodiment of the utility model has the beneficial effects that: the bone conduction earphone provided by the embodiment of the utility model comprises a shell and a bone conduction module, wherein the shell is used for limiting a mirror leg accommodating space communicated with two sides of the shell in a first direction, the shell comprises a skin-approaching wall, the skin-approaching wall and the mirror leg accommodating space are adjacently arranged in a second direction, the second direction is perpendicular to the first direction, the skin-approaching wall is provided with a skin-approaching surface facing away from the mirror leg accommodating space, the skin-approaching surface comprises a top layer skin-approaching surface and a bottom layer skin-approaching surface which are arranged on two sides of the top of the mirror leg accommodating space in a layering manner, the bone conduction module is arranged on the shell and utilizes the bottom layer skin-approaching surface to transmit sound vibration, and in particular, when the bone conduction earphone is used, the top layer skin-approaching surface and the bottom layer skin-approaching surface are respectively positioned on two sides of the top and bottom of the mirror leg, and the ratio of the length of the top layer skin-approaching surface in the third direction perpendicular to the first direction to the length of the bottom layer skin-approaching surface in the third direction is more than or equal to 1:4 and less than or equal to 1:1, so that the bone conduction lever and fulcrum are formed, the bone conduction earphone is prevented from rotating around the mirror leg as an axis, and the bone conduction earphone can keep good contact with the skin of a user.

Drawings

The utility model will now be described in further detail with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic plan view of a bone conduction headset according to an embodiment of the present utility model;

FIG. 2 is a schematic plan view of the bone conduction headset of FIG. 1 at another angle;

fig. 3 is a schematic perspective view of glasses and a bone conduction headset according to another embodiment of the present utility model;

fig. 4 is a schematic plan view of the bone conduction headset shown in fig. 2 after the first housing is rotated relative to the second housing;

fig. 5 is a schematic plan view of a bone conduction headset according to another embodiment of the present utility model;

fig. 6 is a cross-sectional view of the bone conduction headset of fig. 5;

fig. 7 is a schematic plan view of the bone conduction headset of fig. 3.

The reference numerals in the drawings are as follows:

1000. bone conduction headphones;

100. a housing; 110. a temple receiving space; 120. a skin proximal wall; 121. a near skin surface; 1211. a top skin-proximal surface; 1212. the bottom layer is close to the skin surface; 12121. a second protruding portion; 122. a first boss; 130. a first housing; 140. a second housing; 150. a temple access opening; 160. a third housing; 161. a mounting part; 162. a recessed portion; 170. a fourth housing; 171. a receiving groove; 1711. a groove wall; 180. a skin-backing surface; 181. a groove; 1811. a first trough section; 1812. a second trough section; 190. a side surface;

200. a spring;

9000. glasses; 9100. a glasses leg.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. Preferred embodiments of the present utility model will now be described in detail with reference to the accompanying drawings.

An embodiment of the present utility model provides a bone conduction headset 1000, as shown in fig. 1-3, the bone conduction headset 1000 includes a housing 100 and a bone conduction module (not shown). The housing 100 defines a temple receiving space 110 communicating with both sides of the housing 100 in a first direction (X-direction in fig. 1), and when the bone conduction headset 1000 is worn on the glasses 9000, the temple 9100 is disposed in the temple receiving space 110. The shell 100 includes a skin-proximal wall 120, where the skin-proximal wall 120 and the temple-receiving space 110 are adjacently disposed in a second direction (Y direction in fig. 2), the skin-proximal wall 120 has a skin-proximal surface 121 facing away from the temple-receiving space 110, and the skin-proximal surface 121 includes a top skin-proximal surface 1211 and a bottom skin-proximal surface 1212 layered on both sides of the top and bottom of the temple-receiving space 110 as viewed in the second direction, and a ratio of a length of the top skin-proximal surface 1211 in a third direction (Z direction in fig. 2) to a length of the bottom skin-proximal surface 1212 in the third direction is greater than or equal to 1:4 and less than or equal to 1:1, where the second direction is perpendicular to the first direction and the third direction is perpendicular to the first direction and the second direction. The bone conduction module is mounted on the housing 100, and an output end of the bone conduction module is connected with the skin-proximal wall 120 and opposite to the bottom skin-proximal surface 1212 in the second direction, so as to transmit sound vibration by using the bottom skin-proximal surface 1212.

When the bone conduction earphone 1000 of the embodiment is in use, the top layer skin-proximal surface 1211 and the bottom layer skin-proximal surface 1212 are respectively located at the top and bottom sides of the temple 9100, and the ratio of the length of the top layer skin-proximal surface 1211 in the third direction to the length of the bottom layer skin-proximal surface 1212 in the third direction is greater than or equal to 1:4 and less than or equal to 1:1, so as to form a lever and a fulcrum, thereby avoiding the bone conduction earphone 1000 from rotating around the temple 9100 as an axis, enabling the bone conduction earphone 1000 to keep good contact with the skin of a user, improving the sound quality, and having excellent user experience.

Referring to fig. 2 and 4, in an embodiment, the housing 100 includes a first housing 130 and a second housing 140, the temple receiving space 110 has a first housing 130 and a second housing 140, the temple receiving space 110 is defined by the first housing 130 or the first housing 130 and the second housing 140, and the first housing 130 is rotatably connected with the second housing 140, so that when the first housing 130 rotates in a direction away from the second housing 140, a temple access 150 communicating with the temple receiving space 110 is formed between the second housing 140 and the first housing 130.

Specifically, when the temple 9100 is required to be mounted in the temple receiving space 110, the first housing 130 can be rotated in a direction away from the second housing 140, such that the temple port 150 communicating with the temple receiving space 110 is formed between the second housing 140 and the first housing 130, and the temple 9100 can be mounted in the temple receiving space 110 through the temple port 150. After the temple 9100 is inserted into the temple receiving space 110, the first housing 130 is rotated in a direction away from the second housing 140, so that the temple entrance 150 disappears, and the temple 9100 does not escape from the temple receiving space 110.

Referring to fig. 5 and 6, in another embodiment, the housing 100 includes a third housing 160 and a fourth housing 170, the fourth housing 170 is slidably mounted on top of the third housing 160, the temple receiving space 110 is defined by the fourth housing 170 and the third housing 160, and the fourth housing 170 can slide in a direction approaching and separating from the third housing 160 to adjust the size of the temple receiving space 110.

Specifically, when the temple 9100 needs to be mounted in the temple receiving space 110, the fourth housing 170 can be slid in a direction away from the third housing 160, so that the distance between the fourth housing 170 and the third housing 160 can allow the temple 9100 to be placed, and after the temple 9100 is placed between the fourth housing 170 and the third housing 160, the fourth housing 170 can be slid in a direction close to the third housing 160, so that the temple 9100 can be clamped in the temple receiving space 110 by using the fourth housing 170 and the third housing 160, and the temple 9100 is prevented from being separated from the temple 9100 in the receiving space.

Referring to fig. 5 and 6, in the embodiment, the skin proximal wall 120 is disposed on the third housing 160, a mounting portion 161 extending toward the second direction is disposed at a position of the skin proximal wall 120 facing away from the bottom skin proximal surface 1212, the bone conduction module is mounted on the mounting portion 161, the fourth housing 170 is slidably mounted at a position of the skin proximal wall 120 facing away from the top skin proximal surface 1211, and the fourth housing 170 can move in a direction approaching and moving away from the mounting portion 161 to adjust the size of the temple receiving space 110.

When the bone conduction earphone 1000 of this embodiment is mounted, the bone conduction earphone 1000 needs to be mounted on the advancing and retreating side from the side facing away from the skin-proximal surface 121, and when the bone conduction earphone 1000 is dismounted, the bone conduction earphone 1000 needs to be dismounted from the temple 9100 from the opposite direction, and when the user does not wear the glasses 9000, the bone conduction earphone 1000 can be easily dismounted from the temple 9100, but when the user wears the glasses 9000, the bone conduction earphone 1000 can be abutted against the head of the user, and is limited by the head of the user, and the bone conduction earphone 1000 is difficult to be dismounted in a state of not dismounting the glasses 9000, so that the bone conduction earphone 1000 provided by this embodiment is more stable when in use and cannot be separated from the temple 9100 due to external force influence generated when running and jumping.

Referring to fig. 5 and 6, in a specific embodiment, the bone conduction earphone 1000 further includes a spring 200, a receiving groove 171 disposed along the third direction is disposed on a side of the fourth housing 170 facing the skin proximal wall 120, a first protruding portion 122 is disposed on a side of the skin proximal wall 120 facing the fourth housing 170, the first protruding portion 122 extends into the receiving groove 171, the receiving groove 171 includes a groove wall 1711 adjacent to the mounting portion 161, and the spring 200 is disposed between the groove wall 1711 and the first protruding portion 122.

By implementing the present embodiment, when the fourth housing 170 slides in a direction away from the third housing 160, the groove wall 1711 moves in a direction approaching the first protrusion 122, and the spring 200 is compressed to store energy, and after the temple 9100 is placed in the temple accommodating space 110, the groove wall 1711 can be moved in a direction away from the first protrusion 122 by releasing energy of the spring 200, so that the fourth housing 170 and the third housing 160 clamp the temple 9100 together.

Referring to fig. 5 and 6, in a specific embodiment, the mounting portion 161 includes a top surface facing the fourth housing 170, and a position of the top surface adjacent to the skin proximal wall 120 has a recess 162 recessed in a direction away from the fourth housing 170, and the recess 162 is configured to receive the temple 9100.

Specifically, referring to fig. 5, the recess 162 may limit movement of the temple 9100 away from the skin proximal wall 120 such that the bone conduction headset 1000 does not easily fall off the temple 9100 of the glasses 9000 even when the glasses 9000 are removed from a table or otherwise placed.

In one embodiment, the side of the mounting portion 161 facing the fourth housing 170 is provided with an anti-slip layer (not shown), and/or the side of the fourth housing 170 facing the mounting portion 161 is provided with an anti-slip layer; wherein the anti-slip layer is made of an elastic material.

In particular, the anti-slip layer may be made of silica gel, rubber, or other elastic materials. The anti-slip layer can apply force to the glasses legs 9100 through elastic deformation, so that the bone conduction earphone 1000 is further prevented from falling off from the glasses legs 9100 under the influence of external force, and the user experience is excellent.

Referring to fig. 3 and 7, in another embodiment, the housing 100 further includes a back skin surface 180, the back skin surface 180 is disposed opposite to the near skin surface 121, a groove 181 is formed on the back skin surface 180, which communicates two side surfaces 190 adjacent to the back skin surface 180, and the temple receiving space 110 is defined by a groove wall 1711 of the groove 181.

Specifically, the back skin surface 180 is provided with a groove 181, and the groove 181 penetrates through the two side surfaces 190, so that the bone conduction earphone 1000 can be hung on the glasses leg 9100 of the glasses 9000 on one side of the back skin surface 180, and the bone conduction earphone 1000 is only required to be removed from the glasses leg 9100 from the opposite direction when the bone conduction earphone 1000 is detached. Referring to the bone conduction headphones 1000 of fig. 3, since the grooves 181 are provided on the back skin surface 180, when the bone conduction headphones 1000 of fig. 3 are mounted on the temple 9100 of the glasses 9000, it is necessary to move in the M direction in fig. 3, and when the bone conduction headphones 1000 are removed from the temple 9100 of the glasses 9000, it is necessary to move in the N direction in fig. 3, but when the bone conduction headphones 1000 are worn by a user, the bone conduction headphones 1000 are abutted against the head of the user in the N direction, and at this time, the bone conduction headphones 1000 cannot move in the N direction due to the restriction of the head of the user, that is, it is difficult to remove the bone conduction headphones 1000 without removing the glasses 9000. As can be seen, the bone conduction headset 1000 of the present embodiment is stable in use and is not subject to external forces from falling off the temple 9100 of the glasses 9000.

Referring to fig. 7, in a specific embodiment, the recess 181 includes a first groove section 1811 and a second groove section 1812, where the first groove section 1811 is open on the back skin surface 180 and extends toward the direction close to the skin proximal surface 121, and the second groove section 1812 is connected to one side of the first groove section 1811 close to the skin proximal surface 121 and extends toward the side of the top skin proximal surface 1211 away from the bottom skin proximal surface 1212 in a bending manner.

Specifically, when the bone conduction earphone 1000 of the present embodiment is hung on the temple 9100 of the glasses 9000, the temple 9100 will sequentially pass through the first slot section 1811 and the second slot section 1812, so when the bone conduction earphone 1000 is detached from the temple 9100 of the glasses 9000, the temple 9100 will be retracted from the second slot section 1812 to the first slot section 1811, and then moved along the first slot section 1811 to the hanging slot, and since the extending directions of the first slot section 1811 and the second slot section 1812 are different, and the second slot section 1812 is bent and extended towards the side of the top layer skin proximal surface 1211 away from the bottom layer skin proximal surface 1212, even if the bone conduction earphone 1000 is affected by an external force in a single direction, the bone conduction earphone 1000 will not fall off from the temple 9100 of the glasses 9000. Thus, the bone conduction headset 1000 does not easily come off the temple 9100 of the glasses 9000, regardless of whether the user is wearing the glasses 9000 or taking the glasses 9000 aside.

Referring to fig. 1-7, in an embodiment, a second protrusion 12121 is provided on the bottom skin proximal surface 1212, and an output end of the bone conduction module is opposite to the second protrusion 12121 in the second direction, so that the bone conduction module can transmit acoustic vibration using the second protrusion 12121. The bone conduction earphone 1000 of the present embodiment can better transmit sound vibration, so that a user experiences better sound quality.

The embodiment of the utility model shows a bone conduction earphone 1000, as shown in fig. 1-3, the bone conduction earphone 1000 includes a housing 100 and a bone conduction module, the housing 100 defines a temple receiving space 110 that communicates with both sides of the housing 100 in a first direction, the housing 100 includes a skin-proximal wall 120, the skin-proximal wall 120 and the temple receiving space 110 are disposed adjacent to each other in a second direction, the second direction is perpendicular to the first direction, the skin-proximal wall 120 has a skin-proximal surface 121 facing away from the temple receiving space 110, the skin-proximal surface 121 includes a top skin-proximal surface 1211 and a bottom skin-proximal surface 1212 that are layered on both sides of the temple receiving space 110, the bone conduction module is disposed on the housing 100 and transmits sound vibrations by using the bottom skin-proximal surface 1212, in particular, the bone conduction earphone 1000 is used, the top skin-proximal surface 1211 and the bottom skin-proximal surface 1212 are disposed on both sides of the top and bottom of the temple 9100, and the length of the top skin-proximal surface 1211 in the third direction is equal to or greater than 1:1 in the length of the bottom skin-proximal surface 1212 in the third direction, and equal to or greater than 1:1 in the length of the third direction is equal to or greater than 1 in the length of the bottom skin-proximal surface 1212, thereby the bone conduction axis is preferably equal to 1:1, thereby the bone conduction earphone is kept to be rotatable, and the user can be better, and the user can have excellent sound quality, and better quality can be in the user and better, and the earphone is capable of making and the user can be in contact with the user.

It should be understood that the foregoing embodiments are merely illustrative of the technical solutions of the present utility model, and not limiting thereof, and that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art; all such modifications and substitutions are intended to be included within the scope of this disclosure as defined in the following claims.

Claims (10)

1. A bone conduction headset for mounting on the temple of eyeglasses, comprising:

the device comprises a shell, a lens and a lens, wherein the shell defines a glasses leg accommodating space communicated with spaces on two sides of the shell in a first direction, the shell comprises a skin-approaching wall, and the skin-approaching wall and the glasses leg accommodating space are adjacently arranged in a second direction; the skin-approaching wall is provided with a skin-approaching surface far away from the glasses leg accommodating space, the skin-approaching surface comprises a top layer skin-approaching surface and a bottom layer skin-approaching surface which are arranged on the top side and the bottom side of the glasses leg accommodating space in a layered manner when seen from a second direction, and the ratio of the length of the top layer skin-approaching surface in a third direction to the length of the bottom layer skin-approaching surface in the third direction is more than or equal to 1:4 and less than or equal to 1:1, wherein the second direction is perpendicular to the first direction, and the third direction is perpendicular to the first direction and the second direction;

and the output end of the bone conduction module is connected with the skin-approaching wall and is opposite to the bottom skin-approaching surface in a second direction so as to transmit sound vibration by using the bottom skin-approaching surface.

2. The bone conduction headset of claim 1, wherein the housing includes a first housing and a second housing, the temple receiving space being defined by the first housing or the first housing and the second housing, the first housing and the second housing being rotatably connected such that when the first housing is rotated in a direction away from the second housing, a temple access opening is formed between the first housing and the second housing in communication with the temple receiving space.

3. The bone conduction headset of claim 1, wherein the housing includes a third housing and a fourth housing slidably mounted on top of the third housing, the temple receiving space being defined by the fourth housing and the third housing, the fourth housing being slidable toward and away from the third housing to adjust the size of the temple receiving space.

4. The bone conduction headset of claim 3, wherein the third housing includes the skin-proximal wall, a mounting portion extending in a second direction is provided at a position of the skin-proximal wall facing away from the bottom skin-proximal surface, the bone conduction module is mounted to the mounting portion, the fourth housing is slidably mounted at a position of the skin-proximal wall facing away from the top skin-proximal surface, and the fourth housing is movable in directions toward and away from the mounting portion to adjust a size of the temple-receiving space.

5. The bone conduction headset of claim 4, further comprising a spring, wherein a side of the fourth housing facing the skin-proximal wall is provided with a receiving groove arranged along a third direction, a side of the skin-proximal wall facing the fourth housing is provided with a first protrusion extending into the receiving groove, the receiving groove comprises a groove wall adjacent to the mounting portion, and the spring is mounted between the groove wall and the first protrusion.

6. The bone conduction headset of claim 5, wherein the mounting portion includes a top surface facing the fourth housing, the top surface adjacent the skin proximal wall having a recess recessed in a direction away from the fourth housing, the recess for receiving the temple.

7. The bone conduction headset of claim 4, wherein one side of the mounting portion facing the fourth housing is provided with an anti-slip layer, and/or one side of the fourth housing facing the mounting portion is provided with an anti-slip layer; wherein the anti-slip layer is made of an elastic material.

8. The bone conduction headset of claim 1, wherein the housing further comprises a back skin surface, the back skin surface is disposed opposite to the near skin surface, the back skin surface is provided with a groove for communicating two sides adjacent to the back skin surface, and the temple receiving space is defined by walls of the groove.

9. The bone conduction headset of claim 8, wherein the groove comprises a first groove section and a second groove section, the first groove section is opened on the back skin surface and extends towards the direction close to the skin surface, and the second groove section is communicated with one side of the first groove section close to the skin surface and bends and extends towards one side of the top layer skin surface away from the bottom layer skin surface.

10. The bone conduction headset of any one of claims 1-9, wherein a second protrusion is provided on the skin proximal surface of the bottom layer, and an output end of the bone conduction module is opposite to the second protrusion in the second direction, so that the bone conduction module can transmit sound vibration using the second protrusion.