Foldable electronic device
Embodiments of this application provide a foldable electronic device, including: a shaft cap, a body, a first cam component, and a second cam component. The first cam component and the second cam component come into pressure contact. The first cam component is configured to be rotatable around a central shaft of the first cam component. The second cam component is configured to be slidable along a direction of the central shaft. A contact surface of the first cam component and the second cam component includes a locking section, an angle between a normal direction of the locking section and the central shaft is less than or equal to a preset value, and a resultant force of a cam driving member in a rotation direction of the cam driving member is o, so that the body is not automatically unfolded or folded, thereby implementing the freestop characteristic.
1 . A foldable electronic device, comprising:
a shaft cap, a body, a swing arm, a first cam component, a second cam component, and an elastomer, and wherein:
the first cam component and the second cam component are coaxially arranged in the shaft cap;
the first cam component is connected to the body through the swing arm and is configured to be rotatable around a central shaft of the first cam component, so that the body is folded or unfolded around the central shaft under action of an external force;
the first cam component comprises a first end surface facing the second cam component, the second cam component comprises a second end surface facing the first cam component, and the first end surface and the second end surface each comprise at least one cam surface;
the second cam component is configured to be slidable along a direction of the central shaft;
the elastomer is connected to the second cam component and is configured to apply an elastic force to the second cam component, so that the first end surface of the first cam component maintains in contact with the second end surface of the second cam component under action of the elastic force;
in a case that the body is unfolded or folded to a position between fully unfolded and fully folded, the first cam component and the second cam component are in contact with a locking section of the at least one cam surface, and an angle between a normal direction of the locking section and the central shaft is less than or equal to arctan μ, wherein μ is a friction coefficient between the first cam component and the second cam component;
the first end surface and the second end surface are matched annular end surfaces;
the first end surface and the second end surface each comprise an equal quantity of cam surfaces, and the cam surfaces of each of the first end surface and the second end surface are respectively distributed in an annular array;
wherein an angle β by which the locking section rotates around the central shaft is greater than or equal to 90°;
wherein each cam surface comprises a rise travel section and a return travel section, and the locking section is a part of a rise travel section of a corresponding cam surface; and
wherein the locking section comprises a plurality of locking planes along a lifting direction of the rise travel section of the corresponding cam surface, and an angle between a normal direction of any of the plurality of locking planes and the central shaft is less than or equal to arctan μ.
2 . The electronic device according to claim 1 , wherein angles between normal directions of the plurality of locking planes and the central shaft decrease sequentially in the lifting direction of the rise travel section of the corresponding cam surface.
3 . The electronic device according to claim 2 , wherein lengths of the plurality of locking planes decrease sequentially in the lifting direction of the rise travel section of the corresponding cam surface.
4 . The electronic device according to claim 3 , wherein in a case that the body is unfolded or folded to a first position, the first cam component is in surface contact with the second cam component through the plurality of locking planes.
5 . The electronic device according to claim 4 , wherein two adjacent locking planes are transitionally connected by a curved surface.
6 . The electronic device according to claim 5 , wherein the locking section starts from a middle and lower part of the rise travel section of the corresponding cam surface, is formed to a top of the corresponding cam surface along the lifting direction of the rise travel section of the corresponding cam surface, and is connected to the return travel section of the corresponding cam surface at the top of the corresponding cam surface.
7 . The electronic device according to claim 6 , wherein the locking section is connected to the return travel section of the corresponding cam surface through a curved surface.
8 . The electronic device according to claim 7 , wherein a length of the locking section is greater than half of the rise travel section of the corresponding cam surface.
9 . The electronic device according to claim 8 , wherein the elastomer is a spring, and the spring is arranged coaxially with the second cam component and in a compressed state along the direction of the central shaft to apply the elastic force to the second cam component along the direction of the central shaft.
10 . The electronic device according to claim 9 , wherein the locking section is arranged on the at least one cam surface of the at least one of the first end surface or the second end surface.
11 . A foldable electronic device, comprising:
a shaft cap, a body, a swing arm, a first cam component, a second cam component, and a spring, and wherein:
the first cam component and the second cam component are coaxially arranged in the shaft cap;
the first cam component is connected to the body through the swing arm and is configured to be rotatable around a central shaft of the first cam component, and the first cam component is fixed from moving axially along the central shaft of the first cam component;
the first cam component comprises a first end surface facing the second cam component, the second cam component comprises a second end surface facing the first cam component, and the first end surface and the second end surface each comprise at least one cam surface;
the second cam component is configured to be slidable along a direction of the central shaft and fixed from rotating around the central shaft;
the spring is connected to the second cam component and is configured to apply an elastic force to the second cam component, so that the first end surface of the first cam component maintains in contact with the second end surface of the second cam component under action of the elastic force;
in a case that the body is unfolded or folded to a position between fully unfolded and fully folded, the first cam component and the second cam component are in contact with a locking section of the at least one cam surface of the first end surface or the second end surface, and an angle between a normal direction of the locking section and the central shaft is less than or equal to arctan μ, wherein μ is a friction coefficient between the first cam component and the second cam component;
the first end surface and the second end surface are matched annular end surfaces;
the first end surface and the second end surface each comprise an equal quantity of cam surfaces, and the cam surfaces of each of the first end surface and the second end surface are respectively distributed in an annular array;
wherein an angle β by which the locking section rotates around the central shaft is greater than or equal to 90°;
wherein each cam surface comprises a rise travel section and a return travel section, and the locking section is a part of a rise travel section of a corresponding cam surface; and
wherein the locking section comprises a plurality of locking planes along a lifting direction of the rise travel section of the corresponding cam surface, and an angle between a normal direction of any of the plurality of locking planes and the central shaft is less than or equal to arctan μ.
12 . The electronic device according to claim 11 , wherein angles between normal directions of the plurality of locking planes and the central shaft decrease sequentially in the lifting direction of the rise travel section of the corresponding cam surface.
13 . The electronic device according to claim 12 , wherein lengths of the plurality of locking planes decrease sequentially in the lifting direction of the rise travel section of the corresponding cam surface.
14 . The electronic device according to claim 13 , wherein in a case that the body is unfolded or folded to a first position, the first cam component is in surface contact with the second cam component through the plurality of locking planes.
15 . The electronic device according to claim 14 , wherein two adjacent locking planes are transitionally connected by a curved surface.
16 . The electronic device according to claim 15 , wherein the locking section starts from a middle and lower part of the rise travel section of the corresponding cam surface, is formed to a top of the corresponding cam surface along the lifting direction of the rise travel section of the corresponding cam surface, and is connected to the return travel section of the corresponding cam surface at the top of the corresponding cam surface.
17 . The electronic device according to claim 16 , wherein the locking section is connected to the return travel section of the corresponding cam surface through a curved surface.
18 . The electronic device according to claim 17 , wherein a length of the locking section is greater than half of the rise travel section of the corresponding cam surface.
19 . The electronic device according to claim 18 , wherein the spring is arranged coaxially with the second cam component and in a compressed state along the direction of the central shaft to apply the elastic force to the second cam component along the direction of the central shaft.
20 . The electronic device according to claim 19 , wherein the locking section is arranged on the at least one cam surface of the at least one of the first end surface or the second end surface.