Bone conduction speaker and earphone
The present disclosure provides a bone conduction speaker. The bone conduction speaker may include a driving device and a panel. The driving device may be configured to generate a driving force, and the driving force is located in a straight line. The panel may be transmissibly connected to the driving device. The panel may be configured to conduct sound. A region through which the panel interacting with the user's body may have a normal line. The normal line may not be parallel to that straight line.
1 . A bone conduction speaker, comprising a panel, a housing, and a driving device, wherein
the driving device is configured to generate a driving force,
the panel transmissibly connected to the driving device, all or part of the panel being configured to contact or abut a user's body to conduct sound,
the panel and the housing form a cavity, the panel is one of sidewalls of the cavity, and the driving device is located in the cavity, and
the driving force causes user's skins to produce deformations perpendicular to the user's skins and deformations parallel to the user's skins in a region, the region being a plane or a quasi-plane, the quasi-plane being a surface on which an angle between a normal line of any one point in at least 50% region of the surface and an average normal line of the surface is less than a predetermined threshold, and the predetermined threshold being less than 10°.
2 . The bone conduction speaker of claim 1 , wherein
the panel is in direct contact with the user's skins, or in contact with the user's skins through a vibration transmission layer, and
the region is a contact surface between the vibration transmission layer and the user's skins.
3 . The bone conduction speaker of claim 2 , wherein the vibration transmission layer is a face-attached silicone.
4 . The bone conduction speaker of claim 1 , wherein
a straight line where the driving force is located has a positive direction pointing out of the bone conduction speaker via the panel, a normal line of the region has a positive direction pointing out of the bone conduction speaker, and an angle between the straight line and the normal line of the region in the positive direction is an acute angle, and
when the region is the quasi-plane, the normal line of the region is an average normal line of the region.
5 . The bone conduction speaker of claim 4 , wherein the angle between the straight line where the driving force is located and the normal line of the region is a value satisfies at least one of: between 5° and 80°, between 15° and 70°, between 25° and 50°, between 25° and 40°, between 28° and 35°, between 27° and 32°, between 30° and 35°, between 25° and 60°, between 28° and 50°, between 30° and 39°, between 31° and 38°, between 32° and 37°, between 33° and 36°, between 33° and 35.8°, or between 33.5° and 35°.
6 . The bone conduction speaker of claim 1 , wherein stiffnesses of the panel and the housing are set so that a first high-frequency valley, a first high frequency peak, and a second high-frequency peak of the bone conduction speaker are larger than 600 Hz.
7 . The bone conduction speaker of claim 1 , wherein the housing and the panel are integrally formed.
8 . The bone conduction speaker of claim 1 , wherein the driving device comprises a coil and a magnetic system, an axis of the coil and the magnetic system is not parallel to a normal line of the region, and the axis is perpendicular to at least one of a radial plane of the coil or a radial plane of the magnetic system.
9 . The bone conduction speaker of claim 8 , wherein
the coil is connected to at least one of the panel or the housing through a first transmissible path, and
the magnetic system is connected to at least one of the panel or the housing through a second transmission path.
10 . The bone conduction speaker of claim 9 , wherein the first transmission path includes a connection component, the second transmission path includes a vibration transmission sheet, and a stiffness of the connection component is higher than a stiffness of the vibration transmission sheet.
11 . The bone conduction speaker of claim 10 , wherein a stiffener is provided on the connection component, and the stiffener is a facade or a support rod.
12 . The bone conduction speaker of claim 10 , wherein the connection component is a hollow cylinder, one end surface of the hollow cylinder is connected to one end surface of the coil, and the other end surface of the hollow cylinder is connected to at least one of the panel or the housing.
13 . The bone conduction speaker of claim 10 , wherein the connection component is a group of connecting rods, one end of each connecting rod is connected to one end surface of the coil, and the other end of each connecting rod is connected to at least one of the panel or the housing, and the connecting rods are distributed circumferentially around the coil.
14 . The bone conduction speaker of claim 1 , wherein the driving force has a component in at least one of a first quadrant or a third quadrant of an xoy plane coordinate system, and wherein,
an origin o of the xoy plane coordinate system is located on a contact surface of the bone conduction speaker with the user's body, an x axis of the xoy plane coordinate system is parallel to a human coronal axis, an y axis of the xoy plane coordinate system is parallel to a human sagittal axis, a positive direction of the x axis is toward an outside of the user's body, and a positive direction of the y axis is toward a front of the user's body.
15 . The bone conduction speaker of claim 1 , wherein a count of driving devices is at least two, and the driving force is a resultant force composed of driving forces generated by the driving devices.
16 . The bone conduction speaker of claim 15 , the driving devices include a first driving device and a second driving device, a driving force of the first driving device is parallel to a normal line of the region, and a driving force of the second driving device is perpendicular to the normal line of the region.
17 . The bone conduction speaker of claim 1 , wherein
the panel is in contact with the user's skins through a vibration transmission layer,
the vibration transmission layer is glued to the panel, and a bonded region on the vibration transmission layer is more convex than a non-bonded region on the vibration transmission layer, and
the non-bonded region and the panel under the non-bonded region are respectively provided with sound introduction holes.
18 . The bone conduction speaker of claim 17 , wherein
the panel is transmissibly connected to the driving device via a bracket,
the bracket has a ring-shaped body with a ring-shaped sheet structure,
a ring-shaped facade adapted to a shape of the ring-shaped body is provided on the ring-shaped body, and
one side of the ring-shaped facade is lower than the other side of the ring-shaped façade.
19 . The bone conduction speaker of claim 18 , wherein
the bone conduction speaker further includes a first vibration transmission sheet and a second vibration transmission sheet, and
an edge of the second vibration transmission sheet is mechanically connected to the housing, the bracket passes through a middle region of the second vibration transmission sheet and is fixedly connected to the second vibration transmission sheet.
20 . A bone conduction earphone, comprising a bone conduction speaker, the bone conduction speaker including a panel, a housing, and a driving device, wherein
the driving device configured to generate a driving force,
the panel transmissibly connected to the driving device, all or part of the panel being configured to contact or abut a user's body to conduct sound,
the panel and the housing form a cavity, the panel is one of sidewalls of the cavity, and the driving device is located in the cavity, and
the driving force causes user's skins to produce deformations perpendicular to the user's skins and deformations parallel to the user's skins in a region, the region being a plane or a quasi-plane, the quasi-plane being a surface on which an angle between a normal line of any one point in at least 50% region of the surface and an average normal line of the surface is less than a predetermined threshold, and the predetermined threshold being less than 10°.