Folding device, folding shell and electronic equipment

Abstract

The invention provides a folding device which comprises a base, a rotating shaft, a connecting rod piece and an abutting piece, the rotating shaft is rotatably connected to the base, the connecting rod piece can be rotatably connected to the rotating shaft relative to the base, the abutting piece is slidably connected to the rotating shaft in the axial direction of the rotating shaft, and an elastic piece is used for abutting the abutting piece to abut against the connecting rod piece; the connecting rod piece and the abutting piece are connected through matching of a first cam and a second cam, the first cam is provided with an abutting curved surface, the second cam can abut against the abutting curved surface in a sliding mode, and when the folding device is in a non-flattening state, unfolding force exists between the second cam and the abutting curved surface. The unfolding force is used for driving the connecting rod piece to rotate relative to the base towards the unfolded state of the folding device so as to achieve automatic unfolding of the folding device. The invention further provides a folding shell provided with the folding device and electronic equipment.

Description

Technical Field

[0001] The present invention relates to the field of flexible screen supports, and in particular to a folding device for supporting a flexible screen, a folding housing provided with the folding device, and an electronic device provided with the folding housing. Background Art

[0002] At present, folding electronic products with bendable flexible display screens are becoming more and more popular among people. The bendable flexible display screens of folding electronic products in the prior art generally use folding devices for support. In order to make folding electronic products thinner and lighter, the size of the folding devices is also becoming smaller and smaller; however, existing folding electronic products generally require users to use both hands to open them, and it is difficult to open the folding electronic products with one hand, which is inconvenient to use and affects the user experience. Summary of the Invention

[0003] The present application provides a folding device, a folding housing provided with the folding device, and an electronic device provided with the folding housing.

[0004] A folding device provided by the present application includes a base, a rotating shaft, a connecting rod member, and a holding member. The rotating shaft is connected to the base. The connecting rod member is rotatably connected to the rotating shaft relative to the base. The holding member is slidably connected to the rotating shaft along the axial direction of the rotating shaft. An elastic member is used to push the holding member to abut against the connecting rod member. The connecting rod member and the holding member are connected through the cooperation of a first cam and a second cam. The first cam has an abutting curved surface. The second cam can slidably abut against the abutting curved surface. When the folding device is in a non-flattened state, there is an unfolding force between the second cam and the abutting curved surface. The unfolding force is used to drive the connecting rod member to rotate relative to the base towards the flattened state of the folding device.

[0005] The present application further provides a folding housing, which includes a folding device and two frames. The folding device includes a base, a rotating shaft, a connecting rod member, and a holding member. The rotating shaft is connected to the base. The connecting rod member is rotatably connected to the rotating shaft relative to the base. The holding member is slidably connected to the rotating shaft along the axial direction of the rotating shaft. An elastic member is used to push the holding member to abut against the connecting rod member. The connecting rod member and the holding member are connected through the cooperation of a first cam and a second cam. The first cam has an abutting curved surface. The second cam can slidably abut against the abutting curved surface. When the folding device is in a non-flattened state, there is an unfolding force between the second cam and the abutting curved surface. The unfolding force is used to drive the connecting rod member to rotate relative to the base towards the flattened state of the folding device. The folding device is located between the two frames, and the two frames are respectively connected to opposite sides of the folding device.

[0006] The present application also provides an electronic device, which includes a flexible screen, two frames, and a folding device. The folding device includes a base, a rotating shaft, a connecting rod member, and a resisting member. The rotating shaft is connected to the base. The connecting rod member is rotatably connected to the rotating shaft. The resisting member is slidably connected to the rotating shaft along the axial direction of the rotating shaft. An elastic member is used to push the resisting member to abut against the connecting rod member. The connecting rod member and the resisting member are connected through the cooperation of a first cam and a second cam. The first cam has an abutting curved surface. The second cam can slidably abut against the abutting curved surface. When the folding device is in a non-flattened state, there is an unfolding force between the second cam and the abutting curved surface. The unfolding force is used to drive the connecting rod member to rotate relative to the base towards the flattened state of the folding device. The folding device is located between the two frames. Opposite sides of the folding device are respectively connected to the two frames. The flexible screen is disposed on the two frames and the folding device.

[0007] In the folding device of the electronic device of the present application, the connecting rod member and the resisting member are connected through the cooperation of a first cam and a second cam. The first cam has an abutting curved surface. When the second cam slides along the abutting curved surface, there is an unfolding force that drives the corresponding connecting rod member to rotate relative to the base and unfold. When the folding device unfolds, the unfolding force drives the connecting rod member to automatically rotate relative to the base and unfold, thereby realizing the automatic unfolding of the folding device. The electronic device automatically unfolds as the folding device unfolds, which is convenient to use and improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the implementation manners will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0009] Figure 1 is a three-dimensional structural schematic diagram of an electronic device in an embodiment of the present application;

[0010] Figure 2 is Figure 1 a three-dimensional structural exploded schematic diagram of the folding housing and the flexible screen of the electronic device in;

[0011] Figure 3 is Figure 2 a three-dimensional structural schematic diagram of the folding device in;

[0012] Figure 4 is Figure 3 a three-dimensional structural exploded schematic diagram of the folding device in;

[0013] Figure 5 is Figure 4 a schematic exploded perspective view of another perspective of the bendable component in

[0014] Figure 6 is Figure 4 a schematic perspective view of the folding assistance component in

[0015] Figure 7 is Figure 6 a schematic perspective view of another perspective of the folding assistance component in

[0016] Figure 8 is Figure 6 a schematic exploded perspective view of the folding assistance component in

[0017] Figure 9 is Figure 8 a schematic perspective view of another perspective of the folding assistance component in

[0018] Figure 10 is Figure 9 a schematic perspective view of the linkage mechanism and the limiting mechanism in

[0019] Figure 11 is Figure 10 a schematic perspective view of another perspective of the linkage mechanism and the limiting mechanism in

[0020] Figure 12 is Figure 10 a schematic exploded perspective view of the linkage mechanism and the limiting mechanism in

[0021] Figure 13 is Figure 12 a schematic exploded perspective view of another perspective of the linkage mechanism and the limiting mechanism in

[0022] Figure 14 is Figure 12 an enlarged view of the three-dimensional structure of two connecting rod members and the abutting member in

[0023] Figure 15 is Figure 10 a schematic view of the cooperation structure between the first cam of the connecting rod member and the second cam of the abutting member in

[0024] Figure 16 is Figure 10 a schematic front view of the linkage mechanism and the limiting mechanism in

[0025] Figure 17 is Figure 10 a schematic rear view of the linkage mechanism and the limiting mechanism in

[0026] Figure 18 is Figure 10One of the three-dimensional sectional views of the linkage mechanism and the limit mechanism therein;

[0027] Figure 19 is Figure 10 Another three-dimensional sectional view of the linkage mechanism and the limit mechanism therein;

[0028] Figure 20 is Figure 10 Another three-dimensional sectional view of the linkage mechanism and the limit mechanism therein;

[0029] Figure 21 is Figure 1 Schematic three-dimensional structure diagram of the folded state of the electronic device therein;

[0030] Figure 22 is Figure 21 Schematic three-dimensional structure diagram of the linkage mechanism and the limit mechanism therein;

[0031] Figure 23 is Figure 22 Schematic three-dimensional structure diagram of the linkage mechanism and the limit mechanism therein from another perspective;

[0032] Figure 24 is Figure 22 Schematic side structure diagram of the linkage mechanism and the limit mechanism therein;

[0033] Figure 25 is Figure 22 Schematic diagram of the cooperation structure between the first cam of the connecting rod member and the second cam of the abutting member therein;

[0034] Figure 26 is Figure 23 One of the three-dimensional sectional views therein;

[0035] Figure 27 is Figure 23 Another three-dimensional sectional view therein.

[0036] Reference numerals in the drawings:

[0037] 100, electronic device; 20, folding shell; 21, frame; 211, first magnetic attraction member; 213, second magnetic attraction member; 30, flexible screen; 31, bendable area; 33, non-bending area; 40, folding device; 41, folding aid component; 42, bendable component; 421, middle support member; 4210, first support plate; 4211, first back surface; 4212, first connection area; 4218, back cover; 423, side support member; 4230, second support plate; 4231, second back surface; 4232, second connection area; 4233, first connection part; 4234, rotation slot; 4236, second connection part; 4237, adjustment slot; 4237a, first positioning section; 4237b , second positioning section; 44, base; 440, receiving groove; 442, arc groove; 443, positioning hole; 445, transfer hole; 446, connecting hole; 447, fixing hole; 45, rotating mechanism; 450, rotating member; 451, connecting shaft; 452, first rotating part; 4522, arc rail; 453, second rotating part; 454, first connecting tube; 455, connecting member; 4550, guide groove; 4552, receiving groove; 4556, rotating rail; 456, second connecting tube; 46, linkage mechanism; 460, first cam; 4601, top-butting curved surface; 4602, first top-butting section; 4604, second top-butting section; 4605, first protruding part; 4606, first connecting curved surface; 46 07, second connecting curved surface; 4608, first recessed portion; 461, rotating shaft; 4610, shaft body; 4612, connecting cap; 4613, positioning portion; 4616, slot; 462, connecting rod; 4620, guide rail; 4621, driving gear; 4622, first sleeve; 4623, connecting rod body; 4624, sleeve hole; 4626, first limiting surface; 4627, second limiting surface; 4628, adjusting shaft; 464, gear set; 4642, linkage gear; 4644, rotating shaft; 465, fixing member; 4652, second guide slide hole; 4654, first shaft hole; 4656, positioning portion; 4657, positioning rod; 47, limiting mechanism; 473, holding member; 473 0. second cam; 4731. second protrusion; 4732. second sleeve; 4733. sliding surface; 4734. connecting part; 4735. second recessed part; 4736. second axial hole; 475. elastic member; 476. positioning member; 4761. guide slide; 4763. extension part; 4765. first guide slide hole; 4767. avoidance hole; 4768. first anti-slip part; 477. friction assembly; 4770. first friction member; 4772. first positioning hole; 4774. second anti-slip part; 4775. second friction member; 4776. second positioning hole; 4778. fourth anti-slip part; 478. gasket; 4782. through hole; 4784. third anti-slip part; 4779. C-shaped buckle. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] In addition, the descriptions of the following embodiments refer to the attached drawings for illustrating specific embodiments in which the present application can be implemented. The directional terms mentioned in the present application, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer illustration and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present application.

[0040] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "disposed on..." shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0041] Please refer to Figures 1 to 10, the electronic device 100 in an embodiment of the present invention includes a folding housing 20 and a flexible screen 30 disposed on the folding housing 20. The folding housing 20 includes two frame bodies 21 and a folding device 40 disposed between the two frame bodies 21. Opposite sides of the folding device 40 are respectively connected to the two frame bodies 21; the flexible screen 30 is disposed on the front surfaces of the two frame bodies 21 and the front surface of the folding device 40. The flexible screen 30 includes a bendable area 31 disposed on the folding device 50 and two non-bendable areas 33, and the two non-bendable areas 33 are respectively connected to opposite sides of the bendable area 31. The folding device 40 is used to support the bendable area 31 of the flexible screen 30. The folding device 40 can be bent or flattened, and the flexible screen 30 can be bent or flattened along with the folding device 40. The bendable area 31 can be bent into a U shape, a water droplet shape, or other shapes. In this embodiment, the bendable area 31 can be bent into a water droplet shape. One of the two frame bodies 21 is provided with a first magnetic attraction member 211, and the other is provided with a second magnetic attraction member 213; when the folding housing 20 is in a folded state, the first magnetic attraction member 211 and the second magnetic attraction member 213 attract each other to keep the folding housing 20 in the folded state. The folding device 40 includes a folding assistance assembly 41 and a bendable assembly 42 connected to the folding assistance assembly 41. The folding assistance assembly 41 includes a base 44, a rotating mechanism 45, a linkage mechanism 46, and a limiting mechanism 47; the rotating mechanism 45 includes a rotating member 450 and a connecting member 455. The rotating member 450 is rotatably connected to the base 44, and one end of the rotating member 450 away from the base 44 is rotatably connected to the connecting member 455 through a connecting shaft 451.The linkage mechanism 46 includes a rotating shaft 461, a connecting rod member 462, and a gear set 464. The rotating shaft 461 is rotatably connected to the base 44, and the connecting rod member 462 is rotatably connected to the rotating shaft 461 relative to the base 44. The limiting mechanism 47 includes a resisting member 473, an elastic member 475, and a friction assembly 477. The resisting member 473 and the friction assembly 477 are both slidably connected to the rotating shaft 461 along the axial direction of the rotating shaft 461. The elastic member 475 is used to push the resisting member 473 to abut against the connecting rod member 462, that is, the elastic member 475 provides an elastic force for the resisting member 473 and the connecting rod member 462 to abut against each other. The connecting rod member 462 and the resisting member 473 are connected through the cooperation of a first cam and a second cam. The first cam is provided on one of the connecting rod member 462 and the resisting member 473, and the second cam is provided on the other of the connecting rod member 462 and the resisting member 473. In this embodiment, the connecting rod member 462 includes a first cam 460 rotatably sleeved on the corresponding rotating shaft 461. A first cam 460 is provided at one end of the connecting rod member 462 facing the resisting member 473, and a second cam 4730 is provided at one end of the resisting member 473 facing the connecting rod member 462. The first cam 460 has an abutting curved surface 4601, and the second cam 4730 is slidably abutted against the abutting curved surface 4601. When the folding device 40 is in a non-flattened state, there is an unfolding force between the second cam 4730 and the abutting curved surface 4601. This unfolding force is used to drive the connecting rod member 462 to rotate relative to the base 44 towards the flattened state of the folding device 40 to realize the automatic unfolding of the folding device 40. In this embodiment, the linkage mechanism 46 includes two rotating shafts 461 and two connecting rod members 462. The two rotating shafts 461 are respectively rotatably connected to the opposite sides of the same end of the base 44. One connecting rod member 462 is rotatably connected to one of the rotating shafts 461 relative to the base 44, and the other connecting rod member 462 is rotatably connected to the other rotating shaft 461 relative to the base 44. The gear set 464 is provided between the two connecting rod members 462. The two connecting rod members 462 can rotate synchronously relative to the base 44 through the gear set 464. The two connecting rod members 462 are respectively slidably connected to the two rotating mechanisms 45.

[0042] When the rotating mechanism 45 rotates relative to the base 44, the connecting rod member 462 and the corresponding rotating shaft 461 rotate together about the axis of the rotating shaft 461, so that the first cam 460 rotates relative to the second cam 4730, and the second cam 4730 slides along the corresponding abutting surface 4601. The two connecting rod members 462 rotate synchronously and approach or move away from each other under the action of the gear set 464, so as to realize the unfolding or folding of the folding assisting assembly 41; during the process of the second cam 4730 relative to the abutting surface 4601, there is an unfolding force between the second cam 4730 and the abutting surface 4601 to drive the connecting rod member 462 to rotate relative to the base 44 and unfold. When the folding assisting assembly 41 unfolds, the unfolding force formed by the second cam 4730 sliding along the corresponding abutting surface 4601 drives the corresponding connecting rod member 462 to rotate and unfold automatically relative to the base 44, so that the folding assisting assembly 41 can be automatically flattened.

[0043] The number of the folding assisting assemblies 41 on the back of the foldable assembly 42 is at least one. In this embodiment, the number of the folding assisting assemblies 41 is two, and the two folding assisting assemblies 41 are respectively arranged at opposite ends on the back of the foldable assembly 42. The foldable assembly 42 includes a middle support member 421 and two side support members 423 connected to opposite sides of the middle support member 421. The two side support members 423 are respectively movably connected to the two rotating mechanisms 45 and the two connecting rod members 462. The back surface of the flexible screen 30 is attached to the front surfaces of the middle support member 421 and the side support members 423. One of the rotating mechanisms 45 rotates relative to the base 44 about the axis of the corresponding rotating shaft 461, and drives the other side support member 423 to rotate synchronously relative to the base 44 about the axis of the corresponding rotating shaft 461 through the linkage mechanism 46, so as to realize the synchronous unfolding or synchronous bending of the foldable assembly 42, that is, to realize the synchronous folding or synchronous unfolding of the folding device 40. During the flattening process of the folding device 40, the second cam 4730 slides along the corresponding abutting surface 4601 with an unfolding force, and this unfolding force drives the two connecting rod members 462 to rotate automatically and move away from each other relative to the base 44 synchronously, so as to drive the automatic unfolding of the foldable assembly 42 and realize the automatic flattening of the folding device 40.

[0044] In this embodiment, the front side refers to the side with the same orientation as the light-emitting surface of the flexible screen 30, and the back side refers to the side with the orientation opposite to the light-emitting surface of the flexible screen 30. The electronic device 100 is, for example, but not limited to, a mobile phone, a tablet computer, a display, a liquid crystal panel, an OLED panel, a television, a smart watch, a VR head-mounted display, an in-vehicle display, or any other product and component with a display function. The "connection" in the description of the embodiments of the present invention includes two cases of direct connection and indirect connection. For example, the connection between A and B includes the direct connection between A and B or the connection through a third element C or more other elements. The connection also includes two cases of integrated connection and non-integrated connection. The integrated connection means that A and B are integrally formed and connected, and the non-integrated connection means that A and B are non-integrally formed and connected.

[0045] The folding device 40 of the electronic device 100 of the present invention includes a bendable component 42 and a folding assistance component 41. The folding assistance component 41 includes a rotating mechanism 45, a linkage mechanism 46, and a limiting mechanism 47. The link member 462 of the linkage mechanism 46 is rotatably connected to the base 44 through a rotating shaft 461. The abutting member 473 of the limiting mechanism 47 is slidably connected to the rotating shaft 461. The link member 462 and the abutting member 473 are connected through the cooperation of a first cam 460 and a second cam 4730. The first cam 460 has an abutting curved surface 4601. When the second cam 4730 slides along the abutting curved surface 4601, it has an unfolding force that drives the corresponding link member 462 to rotate relative to the base 44 and unfold. When the electronic device 100 is in a folded state, the first magnetic attraction member 211 and the second magnetic attraction member 213 on the two frames 21 attract each other. When the bendable area 31 bends, it has a rebounding force that drives it to unfold. The sum of the unfolding force between the second cam 4730 and the corresponding abutting curved surface 4601 and the rebounding force of the bendable area 31 is less than the magnetic attraction force between the first magnetic attraction member 211 and the second magnetic attraction member 213, so that the electronic device 100 remains in a folded state. When unfolding the electronic device 100, the user uses one hand to push open a small gap between the two frames 21, so that the magnetic attraction force between the first magnetic attraction member 211 and the second magnetic attraction member 213 disappears. The unfolding force between the second cam 4730 and the corresponding abutting curved surface 4601 and the rebounding force of the bendable area 31 drive the two link members 462 of the folding assistance component 41 to rotate synchronously relative to the base 44 and move away from each other, and the two rotating mechanisms 45 rotate synchronously relative to the base 44 and move away from each other, so that the two side support members 423 of the bendable component 42 are unfolded synchronously, thereby realizing the automatic unfolding of the electronic device 100, which is convenient to use and improves the user experience.

[0046] Such as Figures 5 - 8As shown, the rotating member 450 includes a first rotating portion 452 and a second rotating portion 453 connected to the first rotating portion 452. The first rotating portion 452 and the second rotating portion 453 are respectively disposed at opposite ends of the rotating member 450. The first rotating portion 452 is rotatably connected to the base 44, and the second rotating portion 453 is rotatably connected to the connecting member 455 through the connecting shaft 451. The base 44 and the first rotating portion 452 are rotatably connected through the cooperation of an arc groove and an arc rail. The axis of the arc groove is collinear with the rotation axis between the rotating member 450 and the base 44. One of the base 44 and the first rotating portion 452 is provided with the arc groove, and the other of the base 44 and the first rotating portion 452 is provided with the arc rail. In this embodiment, receiving grooves 440 are respectively provided on opposite sides of the front surface of the base 44. The two receiving grooves 440 are used to respectively receive the first rotating portions 452 of the two rotating members 450. Arc grooves 442 are respectively provided on two inner side surfaces of the base 44 opposite to the receiving grooves 440. The two arc grooves 442 are coaxial. Opposite ends of the arc groove 442 respectively penetrate through the front surface of the base 44. Arc rails 4522 are respectively provided on opposite sides of the first rotating portion 452. The two arc rails 4522 are coaxial. When the first rotating portion 452 is received in the corresponding receiving groove 440, the two arc rails 4522 are respectively rotatably received in the two arc grooves 442. A positioning hole 443 is provided on the front surface of the base 44. The locking member passes through the positioning hole 443 and is locked to the back cover, so that the base 44 is fixedly connected to the back cover. Two transfer holes 445, two connection holes 446 and a fixing hole 447 are provided on the end surface of the base 44 facing the linkage mechanism 46. The two transfer holes 445 are located on opposite sides of the base 44. The two connection holes 446 are located between the two transfer holes 445. The fixing hole 447 is located between the two connection holes 446. The axes of the two transfer holes 445 and the two connection holes 446 are parallel to the axis of the arc groove 442.

[0047] In some embodiments, the arc groove on the base 44 and the arc rail on the first rotating portion 452 can be interchanged. Specifically, arc rails are respectively provided on two inner side surfaces of the base 44 opposite to the receiving grooves 440. The two arc rails are coaxial. Arc grooves are respectively provided on opposite sides of the first rotating portion 452. The two arc grooves are coaxial. When the first rotating portion 452 is received in the corresponding receiving groove 440, the two arc rails are respectively rotatably received in the two arc grooves.

[0048] The end of the second rotating part 453 away from the first rotating part 452 is rotatably connected to the first end of the connecting member 455, and the link member 462 is slidably connected to the second end of the corresponding connecting member 455. Specifically, the second rotating part 453 is provided with a first connecting cylinder 454 at one end away from the first rotating part 452. The first end of the connecting member 455 is provided with a receiving groove 4552. The first connecting cylinder 454 is rotatably received in the receiving groove 4552. The connecting member 455 includes a second connecting cylinder 456 provided at its first end. The receiving groove 4552 penetrates the second connecting cylinder 456 along the radial direction of the second connecting cylinder 456. The first connecting cylinder 454 and the second connecting cylinder 456 are mutually engaged so that the first connecting cylinder 454 and the second connecting cylinder 456 are coaxial. The connecting shaft 451 passes through the inner cavities of the first connecting cylinder 454 and the second connecting cylinder 456.

[0049] As Figures 3 - 10 shown, the connecting member 455 is slidably connected to the link member 462. During the process of the rotating mechanism 45 and the link member 462 on the same side of the base 44 rotating relative to the base 44, the link member 462 slides relative to the connecting member 455. One end of the link member 462 away from the base 44 and one end of the connecting member 455 are slidably connected through the cooperation of a guide chute and a guide rail. The guide chute extends along a direction perpendicular to the rotation axis of the rotating member 450 and the base 44. One of the connecting member 455 and the link member 462 is provided with the guide chute, and the other of the connecting member 455 and the link member 462 is provided with the guide rail. In this embodiment, a guide chute 4550 is formed at the second end of the connecting member 455, and the link member 462 is provided with a guide rail 4620 that slidably penetrates through the guide chute 4550.

[0050] The connecting member 455 and the corresponding side support member 423 are rotatably connected through the cooperation of a rotating groove and a rotating rail. One of the side support member 423 and the connecting member 455 is provided with the rotating groove, and the other of the side support member 423 and the connecting member 455 is provided with the rotating rail. In this embodiment, the connecting member 455 is respectively provided with rotating rails 4556 at its opposite ends, and the side support member 423 is provided with a rotating groove. The two rotating rails 4556 are respectively rotatably received in the rotating groove so that the side support member 423 is rotatably connected to the connecting member 455.

[0051] In some embodiments, the connecting member 455 is respectively provided with rotating grooves at its opposite ends, and the side support member 423 is provided with rotating rails. The rotating rails are rotatably received in the corresponding rotating grooves so that the side support member 423 is rotatably connected to the connecting member 455.

[0052] Please refer to Figures 5 - 15, the linkage mechanism 46 is located between the limiting mechanism 47 and the rotating mechanism 45, and the side support member 423 rotates relative to the middle support member 421 through the rotating mechanism 45 and the linkage mechanism 46. The first cam 460 and the second cam 4730 are rotatably engaged with each other; when the first cam 460 rotates relative to the second cam 4730, the second cam 4730 slidably abuts against the abutting curved surface 4601, so that the abutting member 473 slides axially along the rotating shaft 461, and the elastic member 475 is compressed. Optionally, the abutting curved surface 4601 includes a first abutting section 4602 and a second abutting section 4604 located at opposite ends thereof. When the folding device 40 is in a flattened state, the second cam 4730 abuts against the first abutting section 4602; when the folding device 40 is in a folded state, the second cam 4730 abuts against the second abutting section 4604; the second cam 4730 can automatically slide from the second abutting section 4604 to the first abutting section 4602 under the abutting force of the elastic member 475, so as to drive the connecting rod member 462 to rotate relative to the base 44 and flatten. When the folding device 40 is in a flattened state, the second cam 4730 abuts against the first abutting section 4602; when the folding device 40 is in a folded state, the second cam 4730 abuts against the second abutting section 4604. During the folding process of the folding device 40, the two connecting rod members 462 rotate relative to the base 44 around the axes of the corresponding rotating shafts 461 and approach each other. The second cam 4730 slides from the first abutting section 4602 to the second abutting section 4604 on the corresponding abutting curved surface 4601, so as to push the abutting member 473 to slide axially along the rotating shaft 461 to the side away from the connecting rod member 462, the elastic member 475 is compressed, and the two rotating mechanisms 45 rotate relative to the base 44 synchronously and approach each other, so that the two side support members 423 of the foldable assembly 42 fold relative to the middle support member 421 respectively. During the flattening process of the folding device 40, the two elastic members 475 respectively elastically push the abutting member 473, so as to push the abutting member 473 to slide axially along the rotating shaft 461 to the side of the connecting rod member 462, so that the second cam 4730 automatically slides from the second abutting section 4604 to the first abutting section 4602 on the corresponding abutting curved surface 4601. The two connecting rod members 462 rotate relative to the base 44 automatically around the axes of the corresponding rotating shafts 461 and move away from each other. The elastic member 475 is partially reset. The two rotating mechanisms 45 rotate relative to the base 44 automatically and move away from each other, so that the two side support members 423 of the foldable assembly 42 unfold relative to the middle support member 421 respectively until the second cam 4730 abuts against the corresponding first abutting section 4602, and the elastic member 475 keeps abutting against the abutting member 473 to keep the folding device 40 in a flattened state.

[0053] Optionally, the first cam 460 includes at least one first protrusion 4605. The abutting surface 4601 is provided at one end of the first protrusion 4605 facing the second cam 4730. The second cam 4730 includes at least one second protrusion 4731. The second protrusion 4731 has a sliding surface 4733 facing the first cam 460, and the sliding surface 4733 slidably abuts against the abutting surface 4601. Specifically, the first protrusion 4605 further includes a first connecting surface 4606 connected to the first abutting section 4602 and a second connecting surface 4607 connected to the second abutting section 4604. The first abutting section 4602 and the first connecting surface 4606 are in smooth transition, and the second abutting section 4604 and the second connecting surface 4607 are in smooth transition. In this embodiment, the first cam 460 includes two first protrusions 4605, and the two first protrusions 4605 are arranged circumferentially along the rotation axis 461. An abutting surface 4601 is provided at one end of each first protrusion 4605 facing the second cam 4730. The second cam 4730 includes two second protrusions 4731, and the two second protrusions 4731 are arranged circumferentially along the rotation axis 461. Each second protrusion 4731 has a sliding surface 4733 facing the corresponding first cam 460, and the two sliding surfaces 4733 of the second cam 4730 respectively slidably abut against the two abutting surfaces 4601 of the first cam 460. Preferably, the two first protrusions 4605 of the first cam 460 are arranged at equal intervals circumferentially along the rotation axis 461, and a first recess 4608 is formed between the two first protrusions 4605. The two second protrusions 4731 of the second cam 4730 are arranged at equal intervals circumferentially along the rotation axis 461, and a second recess 4735 is formed between the two second protrusions 4731. During the process of the second cam 4730 sliding from the second abutting section 4604 to the first abutting section 4602 of the corresponding abutting surface 4601, there is an unfolding force for the driving link 462 to flatten relative to the base 44 between the second cam 4730 and the abutting surface 4601.

[0054] Optionally, the inclination angle of the abutting surface 4601 gradually increases from the second abutting section 4604 to the first abutting section 4602, and this unfolding force gradually increases as the second cam 4730 slides from the second abutting section 4604 to the first abutting section 4602.

[0055] In other embodiments, the number of the second protrusions 4731 on the second cam 4730 corresponds to the first protrusions 4601 on the corresponding first cam 460. The first cam 460 includes more than three first protrusions 4605. The more than three first protrusions 4605 are arranged at equal intervals in the circumferential direction of the rotation axis 461. A first recess 4608 is formed between every two adjacent first protrusions 4605. The second cam 4730 includes more than three second protrusions 4731. The more than three second protrusions 4731 are arranged at equal intervals in the circumferential direction. A second recess 4735 is formed between every two adjacent second protrusions 4731.

[0056] Optionally, the second abutting section 4604 of the abutting surface 4601 is closer to the abutting member 473 than the first abutting section 4602. Specifically, a first length L1 of the first abutting section 4602 extending along the axial direction of the rotation axis 461 is less than a second length L2 of the second abutting section 4604 extending along the axial direction of the rotation axis 461. The axial extension length of the first protrusion 4605 gradually decreases from the second abutting section 4604 to the first abutting section 4602, and the inclination angle of the abutting surface 4601 gradually increases from the second abutting section 4604 to the first abutting section 4602. During the process that the second protrusion 4731 automatically slides from the second abutting section 4604 to the first abutting section 4602 on the corresponding abutting surface 4601, the unfolding force between the second protrusion 4731 and the abutting surface 4601 gradually increases as the second cam 4730 slides from the second abutting section 4604 to the first abutting section 4602.

[0057] As Figures 11 - 13 shown, the rotation axis 461 includes a shaft body 4610 and a connecting cap 4612 located at one end of the shaft body 4610. A positioning portion 4613 is provided at a position of the shaft body 4610 close to the connecting cap 4612. The connecting rod member 462 is fixedly connected to the rotation axis 461 through the positioning portion 4613. In this embodiment, the positioning portion 4613 is a positioning surface provided on the outer wall of the shaft body 4610 and extending along the axial direction of the shaft body 4610. The connecting cap 4612 is used for rotatably connecting to the base 44. A card slot 4616 is provided at an end of the shaft body 4610 away from the connecting cap 4612. The card slot 4616 is located on the outer peripheral wall of the shaft body 4610 and surrounds the shaft body 4610 in a circumferential direction.

[0058] The connecting rod member 462 includes a first sleeve 4622 and a connecting rod body 4623 connected to the outer peripheral wall of the first sleeve 4622. The first sleeve 4622 is sleeved on the shaft body 4610 and can rotate around the axis of the rotating shaft 461. The first cam 460 is convexly arranged at one end of the first sleeve 4622. The first cam 460 is coaxial with the first sleeve 4622. A driving gear 4621 is arranged on the outer peripheral wall of the first sleeve 4622. Specifically, the driving gear 4621 is located on the side of the first sleeve 4622 away from the connecting rod body 4623, and the axis of the driving gear 4621 is colinear with the axis of the first sleeve 4622. In this embodiment, the rotation angle of the teeth of the driving gear 4621 arranged along the circumference of the first sleeve 4622 is 180 degrees, that is, the driving gear 4621 is arranged on half of the outer peripheral wall of the first sleeve 4622. The first sleeve 4622 has a waist-shaped sleeve hole 4624. After the rotating shaft 461 is inserted into the sleeve hole 4624, the first sleeve 4622 can be positioned on the positioning portion 4613. The connecting rod body 4623 has two opposite sides protruding with guide rails 4620, which extend along the length direction of the connecting rod body 4623.

[0059] like Figures 3 - 7As shown, the connecting rod member 462 is movably connected to the corresponding side support member 423 through the cooperation of an adjustment slot and an adjustment shaft, and the axis of the adjustment shaft is parallel to the axis direction of the rotating shaft 461; one of the side support member 423 and the connecting rod member 462 is provided with the adjustment slot, and the other of the side support member 423 and the connecting rod member 462 is provided with the adjustment shaft. In this embodiment, the side support member 423 is provided with an adjustment slot 4237, and the end of the connecting rod body 4623 away from the rotating shaft 461 is provided with an adjustment shaft 4628, and the adjustment shaft 4628 is rotatably and slidably disposed in the adjustment slot 4237. The middle support member 421 includes a strip-shaped first support plate 4210 and a back cover 4218 connected to the back surface of the first support plate 4210. The first support plate 4210 includes a front surface and a first back surface 4211 facing away from the front surface. The first back surface 4211 of the first support plate 4210 is provided with a first connection area 4212 for positioning on the front surface of the folding assist assembly 41. In this embodiment, the first connection areas 4212 are respectively provided at opposite ends of the first back surface 4211, and the two folding assist assemblies 41 are respectively connected to the two first connection areas 4212. The back cover 4218 is a strip-shaped frame, and connection portions are respectively provided at opposite ends of the inner surface of the cover body 4518, and the backs of the bases 44 of the two folding assist assemblies 41 are respectively connected to the two connection portions of the cover body 4518. Each side support member 423 includes a strip-shaped second support plate 4230 and a second connection area 4232 provided on the second back surface 4231 of the second support plate 4230. In this embodiment, two second connection areas 4232 are provided on the second back surface 4231, and the two second connection areas 4232 are located at opposite ends of the second support plate 4230, and the second connection area 4232 is used to connect the corresponding rotating mechanism 45 and the connecting rod member 462. Each second connection area 4232 includes a pair of first connection portions 4233 and second connection portions 4236 spaced apart from each other. The first connection portions 4233 are provided on the side away from the middle support member 421, and the second connection portions 4236 are provided on the side close to the middle support member 421. In this embodiment, each second connection portion 4236 is located between a corresponding pair of first connection portions 4233. Each pair of first connection portions 4233 is provided with a pair of arc-shaped rotating slots 4234, and the axes of the pair of rotating slots 4234 are collinear. An arc-shaped adjustment slot 4237 is provided on the second connection portion 4236, and the middle of the adjustment slot 4237 is bent toward the side away from the second support plate 4230. The adjustment slot 4237 includes a first positioning section 4237a and a second positioning section 4237b at its opposite ends, and the first positioning section 4237a is closer to the middle support member 421 than the second positioning section 4237b.

[0060] Please refer to Figures 10 - 13, the gear set 464 includes two meshing linkage gears 4642 and two rotating shafts 4644. The two linkage gears 4642 are respectively fixedly sleeved on the middle parts of the two rotating shafts 4644. The driving gears 4621 of the two link members 462 are respectively meshed with the two linkage gears 4642. The diameter of the pitch circle of the linkage gear 4642 is smaller than that of the driving gear 4621, and the number of teeth around the linkage gear 4642 is less than the number of teeth around the driving gear 4621. Under a certain width and height space of the rotating shaft 461, by arranging the two linkage gears 4642 between the two rotating shafts 461, the diameter of the pitch circle of the driving gear 4621 can be increased, so that the outer diameter of the first cam 460 can be increased, a larger frictional torque can be provided between the first cam 460 and the second cam 4730, and the fatigue wear of the first cam 460 can be reduced, thereby prolonging the service life of the first cam 460.

[0061] The linkage mechanism 46 further includes a fixing member 465 sleeved on the rotating shaft 461, and the limiting mechanism 47 further includes a positioning member 476. The fixing member 465 is connected to one end of the two rotating shafts 461, and the positioning member 476 is connected to the other opposite end of the two rotating shafts 461. The connecting rod member 462, the gear set 464, the abutting member 473 and the elastic member 475 are located between the fixing member 465 and the positioning member 476. The positioning member 476 has first guide slide holes 4765 at opposite ends thereof, the fixing member 465 is a rectangular positioning sheet, and second guide slide holes 4652 are respectively provided at opposite ends thereof. The shaft bodies 4610 of the two rotating shafts 461 are respectively penetrated through the two first guide slide holes 4765 and the two second guide slide holes 4652. The rotating shaft 461 can rotate in the first guide slide hole 4765 and the second guide slide hole 4652, and the fixing member 465 and the positioning member 476 can only slide along the axial direction of the two rotating shafts 461. The middle part of the fixing member 465 is provided with two first shaft holes 4654 spaced apart between the two second guide slide holes 4652, and the axis of the second guide slide hole 4652 is parallel to the axis of the first shaft hole 4654; the two rotating shafts 4644 are respectively rotatably inserted into the first shaft holes 4654. The fixing member 465 is provided with a positioning portion 4656 on the side facing the connecting rod 462, and the connecting rod 462 includes a first limiting surface 4626 and a second limiting surface 4627; when the two connecting rods 462 are in a folded state relative to the base 44, the positioning portion 4656 abuts against the first limiting surface 4626; when the two connecting rods 462 are in a flattened state relative to the base 44, the positioning portion 4656 abuts against the second limiting surface 4627. Specifically, a notch is provided around the sleeve hole 4624 at one end of the first sleeve 4622 away from the first cam 460, and the first limiting surface 4626 and the second limiting surface 4627 are the opposite end surfaces of the notch, respectively. The first limiting surface 4626 is farther away from the guide rail 4620 than the second limiting surface 4627; the positioning portion 4656 is a positioning block. A positioning rod 4657 is provided on the side of the fixing member 465 away from the positioning portion 4656, and the positioning rod 4657 is used to be positioned on the base 44. The opposite end surfaces of the fixing member 465 are set as arc surfaces.

[0062] The abutting member 473 includes a second sleeve 4732 which is sleeved on the rotating shaft 461 in an axially slidable manner along the axis of the rotating shaft 461. A second cam 4730 is provided at one end of the second sleeve 4732 facing the link member 562, and the second cam 4730 is coaxial with the second sleeve 4732. In this embodiment, the abutting member 473 includes two second cams 4730 located at its opposite ends, and a connecting portion 4734 connecting the two second cams 4730. The axes of the two second sleeves 4732 are spaced parallel to each other, and the two second cams 4730 are respectively provided on the same side of the two second sleeves 4732. The two second cams 4730 are respectively slidably sleeved on the two rotating shafts 461. The rotating shaft 461 can rotate relative to the abutting member 473, and the abutting member 473 can slide axially along the rotating shaft 461. One of the second cams 4730 is slidably abutted against one of the abutting surfaces 4601, and the other second cam 4730 is slidably abutted against the other abutting surface 4601. The second cam 4730 includes two second protruding portions 4731 which are arranged circumferentially along the corresponding second sleeve 4732. A sliding surface 4733 is provided at one end of each second protruding portion 4731 facing the first cam 460. Preferably, the two second protruding portions 4731 of the second cam 4730 are evenly spaced circumferentially along the corresponding second sleeve 4732. The abutting member 473 is provided with a second shaft hole 4736. Specifically, the connecting portion 4734 is provided with two second shaft holes 4736, and the axis of the second shaft hole 4736 is parallel to the axis of the second cam 4730. The opposite ends of the rotating shaft 4644 of the linkage gear 4642 are respectively inserted through the first shaft hole 4654 and the second shaft hole 4736.

[0063] In this embodiment, the elastic member 475 includes a spring sleeved on each rotating shaft 461, and the elastic member 475 is located between the positioning member 476 and the abutting member 473. The positioning member 476 includes a rectangular guide slide piece 4761 and an extension portion 4763 provided in the middle of one side surface of the guide slide piece 4761. First guide slide holes 4765 are respectively provided at the opposite ends of the guide slide piece 4761, and the opposite end surfaces of the guide slide piece 4761 are set as arc surfaces. The extending direction of the extension portion 4763 is parallel to the axis of the first guide slide hole 4765, and two avoiding holes 4767 are provided on the end surface of the extension portion 4763 facing away from the guide slide piece 4761. Preferably, a first anti-sliding portion 4768 is provided around the first guide slide hole 4765 on the side surface of the guide slide piece 4761 facing away from the extension portion 4763. Specifically, the first anti-sliding portion 4768 can be, but is not limited to, a convex portion, a hole or a rough surface provided on the guide slide piece 4761, etc.

[0064] The friction assembly 477 includes a first friction member 4770 connected to the rotating shaft 461, and the first friction member 4770 abuts against the positioning member 476. When the rotating shaft 461 rotates relative to the base 44, the first friction member 4770 rotates with the rotating shaft 461, and there is a frictional resistance between the first friction member 4770 and the positioning member 476. Specifically, the first friction member 4770 is a circular friction plate, and a first positioning hole 4772 is formed in the middle of the friction plate. The first friction member 4770 is fixedly connected to the rotating shaft 461 through the first positioning hole 4772. Second anti-slip portions 4774 are respectively provided on two opposite side surfaces of the first friction member 4770, and the second anti-slip portions 4774 can be, but are not limited to, convex portions, holes or rough surfaces, etc. In some embodiments, the first anti-slip portion 4768 on the positioning member 476 can be omitted, and only the second anti-slip portion 4774 on the side surface of the first friction member 4770 facing the positioning member 476 is retained; or the second anti-slip portion 4774 on the side surface of the first friction member 4770 facing the positioning member 476 can be omitted, and only the first anti-slip portion 4768 on the positioning member 476 is retained.

[0065] The friction assembly 477 further includes a gasket 478 sleeved on the rotating shaft 461, and the first friction member 4770 is between the gasket 478 and the positioning member 476; when the first friction member 4770 rotates with the rotating shaft 461, there is a frictional resistance between the first friction member 4770 and the positioning member 476 and between the first friction member 4770 and the gasket 478. Specifically, the gasket 478 is rectangular, and the opposite ends of the gasket 478 are respectively provided with arc surfaces. Third anti-slip portions 4784 are respectively provided on two opposite side surfaces of the gasket 478. In this embodiment, through holes 4782 are respectively provided at the opposite ends of the gasket 478, and third anti-slip portions 4784 are provided around each through hole 4782 on two opposite side surfaces of the gasket 478. The third anti-slip portions 4784 can be convex portions, holes or rough surfaces, etc.

[0066] In some embodiments, the third anti-slip portion 4784 on the side surface of the gasket 478 facing the first friction member 4770 can be omitted, and only the second anti-slip portion 4774 on the side surface of the first friction member 4770 facing the gasket 478 is retained; or the second anti-slip portion 4774 on the side surface of the first friction member 4770 facing the gasket 478 can be omitted, and only the third anti-slip portion 4784 on the side surface of the gasket 478 facing the first friction member 4770 is retained.

[0067] The friction assembly 477 further includes a second friction member 4775 connected to the rotating shaft 461, and the gasket 478 abuts against the second friction member 4775; when the second friction member 4775 rotates with the rotating shaft 461, there is a frictional resistance between the second friction member 4775 and the gasket 478. Specifically, the second friction member 4775 is a circular friction plate, and a second positioning hole 4776 is formed in the middle of the second friction member 4775. The second friction member 4775 is fixedly connected to the rotating shaft 461 through the second positioning hole 4776. Fourth anti-slip portions 4778 are respectively provided on opposite side surfaces of the second friction member 4775, and the fourth anti-slip portions 4778 can be, but are not limited to, convex portions, holes or rough surfaces, etc.; in this embodiment, a plurality of holes are respectively provided on opposite side surfaces of the second friction member 4775, and these holes can increase the frictional resistance of the second friction member 4775.

[0068] In some embodiments, the third anti-slip portion 4784 on the side surface of the gasket 478 facing the second friction member 4775 is omitted, and only the fourth anti-slip portion 4778 on the side surface of the second friction member 4775 facing the gasket 478 is retained; or the fourth anti-slip portion 4778 on the side surface of the second friction member 4775 facing the gasket 478 can be omitted, and only the third anti-slip portion 4784 on the side surface of the gasket 478 facing the second friction member 4775 is retained.

[0069] The limiting mechanism 47 further includes two C-shaped fasteners 4779, and the C-shaped fasteners 4779 are used for being clamped in the clamping grooves 4616 of the rotating shaft 461.

[0070] Please refer to Figures 6 - 14 and Figures 16 - 20, when assembling the folding assistance component 41, insert the end parts of the two rotating shafts 461 away from the connecting cap 4612 into the two second guiding sliding holes 4652 of the fixing member 465 respectively until the fixing member 465 abuts against the connecting cap 4612; place the gear set 464 between the two connecting rod members 462 so that the two linkage gears 4642 respectively mesh with the two driving gears 4621; insert the end parts of the two rotating shafts 461 provided with the clamping grooves 4616 from the end away from the first cam 460 into the socket holes 4624 of the two first sleeves 4622 respectively, and insert the two rotating shafts 4644 of the gear set 464 into the two first shaft holes 4654 of the fixing member 465 respectively, and the positioning parts 4656 are placed in the notches of the corresponding first sleeves 4622; at this time, each positioning part 4656 is located between the corresponding first limiting surface 4626 and the second limiting surface 4627. Sleeve the two second sleeves 4732 of the abutting member 473 on the shaft bodies 4610 of the two rotating shafts 461 respectively, so that the two second cams 4730 of the abutting member 473 respectively mesh with the two first cams 460 rotatably, and the two rotating shafts 4644 are respectively inserted into the two second shaft holes 4736 of the abutting member 473, that is, the end parts of the rotating shafts 4644 expose from the side surface of the abutting member 473 away from the fixing member 465; sleeve the two elastic members 475 on the two rotating shafts 461 respectively; insert the end parts of the two rotating shafts 461 provided with the clamping grooves 4616 into the two first guiding sliding holes 4765 of the positioning member 476 respectively, and insert the two rotating shafts 4644 into the two avoiding holes 4767 of the positioning member 476 respectively, so that the elastic members 475 are clamped between the abutting member 473 and the positioning member 476; sleeve two of the first friction members 4770 on the two rotating shafts 461 respectively, sleeve the gasket 478 on the two rotating shafts 461, and then sleeve the two second friction members 4775 on the two rotating shafts 461 respectively. At this time, the gasket 478 is located between the first friction member 4770 and the second friction member 4775, and the clamping groove 4616 of each rotating shaft 461 exposes from the side surface of the corresponding second friction member 4775 away from the positioning member 476; then snap the two C-shaped fasteners 4779 onto the clamping grooves 4616 of the two rotating shafts 461 respectively. At this time, the two C-shaped fasteners 4779 respectively abut against the side surfaces of the two second friction members 4775 away from the positioning member 476, the elastic members 475 are in a compressed state, the opposite ends of the elastic members 475 respectively abut against the abutting member 473 and the positioning member 476, and the second cam 4730 abuts against the first abutting section 4602 of the corresponding abutting curved surface 4601, so that the two connecting rod members 462 are kept in a flattened state.

[0071] When the linkage mechanism 46 is bent from the fully flattened state, one of the link members 462 is bent relative to the abutting member 473 toward the other link member 462. This one link member 462 rotates along the axis of the corresponding rotating shaft 461 to drive the corresponding rotating shaft 461, the driving gear 4621, and the first cam 460 to rotate along the axis of the rotating shaft 461. The rotating shaft 461 rotates within the first guiding slide hole 4765 corresponding to the positioning member 476, the second guiding slide hole 4652 corresponding to the fixing member 465, and the through hole 4782 corresponding to the gasket 478. The rotating driving gear 4621 drives the other driving gear 4621 to rotate through the gear set 464. The rotation of the other driving gear 4621 drives the corresponding rotating shaft 461, the first sleeve 4622, the first cam 460, and the link body 4623 to rotate, so that the two link members 462 of the linkage mechanism 46 approach each other synchronously. At the same time, each second cam 4730 slides from the first abutting section 4602 to the second abutting section 4604 on the corresponding abutting surface 4601. The abutting member 473 slides axially along the rotating shaft 461 to squeeze the elastic member 475. The elastic member 475 elastically pushes against the positioning member 476, so that the first friction member 4770 is clamped between the gasket 478 and the positioning member 476, and the second friction member 4775 is clamped between the gasket 478 and the C-shaped buckle 4779. The first friction member 4770 and the second friction member 4775 rotate relative to the positioning member 476 and the gasket 478 along with the corresponding rotating shaft 461.

[0072] In other usage modes, the two link members 462 can be rotated together in opposite directions. Each link member 462 rotates along the axis of the corresponding rotating shaft 461 to drive the corresponding rotating shaft 461, the driving gear 4621, and the first cam 460 to rotate along the axis of the rotating shaft 461. The two driving gears 4621 drive the two linkage gears 4642 to rotate together, so that the two link members 462 approach each other synchronously. At the same time, the first cam 460 on each link member 462 rotates relative to the corresponding second cam 4730, so that each second cam 4730 slides from the first abutting section 4602 to the second abutting section 4604 on the corresponding abutting surface 4601. The abutting member 473 slides axially along the rotating shaft 461 to squeeze the elastic member 475. The elastic member 475 elastically positions the positioning member 476 to clamp the first friction member 4770 and the second friction member 4775. The first friction member 4770 and the second friction member 4775 rotate relative to the positioning member 476 and the gasket 478 along with the corresponding rotating shaft 461.

[0073] When the linkage mechanism 46 unfolds from the fully bent state, the two elastic members 475 respectively elastically push against the two second sleeves 4732, causing the second cam 4730 to slidably push against the corresponding abutting surface 4601. Since there is an unfolding force between the second cam 4730 and the corresponding abutting surface 4601 that drives the driving link member 462 to rotate relative to the abutting member 473 and unfold, this unfolding force can drive the two link members 462 to rotate synchronously and automatically relative to the abutting member 473 and move away from each other. Each second cam 4730 automatically slides from the second abutting section 4604 to the first abutting section 4602 on the corresponding abutting surface 4601. Each link member 462 drives the corresponding rotating shaft 461 to rotate. The rotating shaft 461 rotates in the corresponding second guiding hole 4652, the inner cavity of the second sleeve 4732, the first guiding hole 4765 and the through hole 4782, and drives the corresponding first friction member 4770 and second friction member 4775 to rotate.

[0074] The first rotating portions 452 of the two rotating members 450 are respectively received in the two receiving grooves 440 of the base 44, so that the two arc tracks 4522 of each first rotating portion 452 are respectively inserted into the corresponding two arc grooves 442; the assembly of the linkage mechanism 46 and the limiting mechanism 47 is placed between the two connecting members 455, and the guide rails 4620 of the two link members 462 are respectively slidably inserted into the guide grooves 4550 of the two connecting members 455, and the two connecting caps 4612, the two rotating shafts 4644 and the positioning rod 4657 are respectively inserted into the two transfer holes 445, the two connecting holes 446 and the fixing hole 447.

[0075] As Figures 3 - 5As shown, when assembling the folding assistance component 41 to the bendable component 42, place the two side support members 423 on opposite sides of the base 44. Rotatably accommodate the two rotation rails 4556 of each connecting member 455 in the corresponding pair of rotation slots 4234 respectively, and insert the adjustment shaft 4628 of the link member 462 into the corresponding adjustment slot 4237. Place the middle support member 421 on the base 44, such that the first support plate 4210 is located between the two side support members 423, and connect the two first connection regions 4212 to the two folding assistance components 41 respectively. Then connect the back cover 4218 to the back surface of the base 44. The rotation axis between the rotating member 450 and the base 44 is parallel to the axis of the rotating shaft, and the rotation axis between the rotating member 450 and the connecting member 455 is parallel to the axis of the rotating shaft. When the two side support members 423 are in a fully flattened state, the adjustment shaft 4628 is positioned at the second positioning section 4237b of the corresponding adjustment slot 4237, the positioning portion 4656 abuts against the second limiting surface 4627, and the second cam 4730 is positioned at the corresponding first abutting section 4602, so as to keep the folding device 40 in a fully flattened state. The front surfaces of the two side support members 423 and the middle support member 421 are coplanar, preventing the side support members 423 from being bent backward relative to the middle support member 421. When the two side support members 423 are in a fully bent state, the adjustment shaft 4628 is located at the first positioning section 4237a of the corresponding adjustment slot 4237, the positioning portion 4656 abuts against the first limiting surface 4626, and the front surfaces of the two side support members 423 and the middle support member 421 enclose a water droplet shape, preventing the side support members 423 from being further bent relative to the middle support member 421.

[0076] Please also refer to Figures 1 - 3, place the installed folding device 40 between the two frames 21, and fixedly connect the connecting members 455 on the opposite sides of the folding device 40 to the two frames 21 respectively. When the folding housing is in the folded state, the first magnetic member 211 and the second magnetic member 213 attract each other, and the adsorption force between the first magnetic member 211 and the second magnetic member 213 is greater than or equal to the unfolding force between the second cam of the folding device 40 and the abutting curved surface 4601, so as to keep the folding housing in the folded state. When the two frames 21 are unfolded from each other until there is no adsorption force between the first magnetic member 211 and the second magnetic member 213, the unfolding force between the second cam 4730 and the abutting curved surface 4601 drives the second cam 4730 to slide on the abutting curved surface 4601, so that the link member 462 automatically rotates relative to the base 44, so that the two frames 21 rotate and unfold automatically to realize the automatic flattening of the folding housing. When the folding housing is in the flattened state, the fronts of the two frames 21, the front of the middle support member 421, and the fronts of the two side support members 423 are coplanar. Connect the bendable area 31 of the flexible screen 30 to the front of the folding device 40, and connect the two non-bendable areas 33 to the fronts of the two frames 21 respectively. When the flexible screen 30 is in the flattened state, the second cam 4730 abuts against the corresponding first abutting section 4602, and the elastic member 475 has a pre-tension force to push against the abutting member 473 and the positioning member 476 to limit the bendable assembly 42 to maintain the flattened state, and the included angle between the two link members 462 is 180 degrees. Since the front of the middle support member 421 is a complete surface and there is no step difference in the middle support member 421, when the flexible screen 30 is flattened, it will not be impacted at the step difference, and there will be no bad problems such as color dots and bright dots on the flexible screen 30, ensuring the reliability of the flexible screen 30. At the same time, it also improves the touch feel of the flexible screen 30 and enhances the user experience.

[0077] Please refer to Figures 1 - 4 and Figures 21 - 27, when bending the electronic device 100, a bending force is applied to at least one of the two frames 21 of the electronic device 100, so that the rotating mechanism 45 connected to the two frames 21 rotates in a direction approaching each other, and the folding device 40 is bent by the two folding assistance components 41, and the bendable area 31 of the flexible screen 30 is bent along with the bendable component 42. Specifically, if a bending force is applied to one of the frames 21, this one frame 21 drives the corresponding rotating mechanism 45 to rotate relative to the base 44 towards the side close to the flexible screen 30; so as to drive the corresponding link member 462 to rotate relative to the base 44 towards the side close to the flexible screen 30 along the axis of the rotating shaft 461. At the same time, the guide rail 4620 of the link member 462 slides in the guide groove 4550 of the corresponding connecting member 455, and the first sleeve 4622, the rotating shaft 461, the driving gear 4621 and the first cam 460 of the link member 462 rotate along the axis of the corresponding rotating shaft 461. The rotating driving gear 4621 drives another driving gear 4621 to rotate through the gear set 464. The rotation of the other driving gear 4621 drives the corresponding rotating shaft 461, the first sleeve 4622, the first cam 460 and the link body 4623 to rotate, so that the two link members 462 of the linkage mechanism 46 approach each other synchronously; at the same time, the first cam 460 on each link member 462 rotationally pushes against the corresponding second cam 4730, so that the second cam 4730 slides from the first abutting section 4602 to the second abutting section 4604 on the corresponding abutting curved surface 4601. The abutting member 473 slides axially along the rotating shaft 461 to squeeze the elastic member 475. The opposite ends of the elastic member 475 elastically push against the abutting member 473 and the positioning member 476 respectively. The first friction member 4770 is clamped between the gasket 478 and the positioning member 476, and the second friction member 4775 is clamped between the gasket 478 and the C-shaped buckle 4779, and the first friction member 4770 and the second friction member 4775 rotate relative to the gasket 478 and the positioning member 476 along with the corresponding rotating shaft 461. During the bending process of the linkage mechanism 46, the first rotating part 452 of the rotating part 450 rotates relative to the base 44 through the cooperation of the arc track and the corresponding arc groove. The second rotating part 453 of the rotating part 450 is rotatably connected to the corresponding connecting member 455 along the corresponding connecting shaft 451. The adjusting shaft 4628 rotates and slides from the second positioning section 4237b to the first positioning section 4237a in the corresponding adjusting groove 4237. The two link members 462 rotate along the axis of the corresponding rotating shaft 461 and approach each other to realize the mutual approach of the two side support members 423, so that the folding device 40 is in a bent state, and the bendable area 31 of the flexible screen 30 is bent along with the folding device 40 until the first magnetic attraction member 211 and the second magnetic attraction member 213 on the two frames 21 adsorb each other, and the bendable area 31 is bent into a water droplet shape.At this time, the adsorption force between the first magnetic member 211 and the second magnetic member 213 is greater than or equal to the sum of the unfolding force between the second cam 4730 of the folding device 40 and the abutting curved surface 4601 and the restoring force of the foldable area 31, so that the electronic device 100 remains in the folded state.

[0078] In other folding methods of the electronic device 100, a folding force can also be applied to the two frames 21 simultaneously. The two frames 21 respectively drive the two side support members 423 to rotate towards the side close to the flexible screen 30, and the folding device 40 is used to realize the folding of the electronic device 100.

[0079] When the user needs to flatten the electronic device 100, the user can use one hand to pull the two frames 21 apart until there is no adsorption force between the first magnetic member 211 and the second magnetic member 213. The elastic member 475 elastically pushes the corresponding second sleeve 4732. The unfolding force between the second cam 4730 and the abutting curved surface 4601 and the restoring force of the foldable area 31 drive the folding device 40 to automatically unfold together, so that the two frames 21 unfold to the flattened state. Specifically, the unfolding force and the restoring force drive the two link members 462 of each folding assistance component 41 to rotate synchronously relative to the base 44 and move away from each other. Each second cam 4730 automatically slides from the second abutting section 4604 to the first abutting section 4602 on the corresponding abutting curved surface 4601. The two driving gears 4621 rotate relative to the gear set 464 respectively, so that the two link members 462 automatically rotate along the axes of the corresponding rotating shafts 461 and move away from each other to realize the mutual separation of the two side support members 423, so that the folding device 40 automatically unfolds, the two frames 21 unfold from each other, and the foldable area 31 of the flexible screen 30 unfolds with the folding device 40 until the flexible screen 30 is flattened.

[0080] During the flattening process of the electronic device 100, the unfolding force between the second cam 4730 and the abutting curved surface 4601 and the restoring force of the foldable area 31 can make the electronic device 100 automatically unfold from the folded state to the flattened state; the second cam 4730 automatically slides from the second abutting section 4604 to the first abutting section 4602 on the corresponding abutting curved surface 4601, and the unfolding force between the second cam 4730 and the abutting curved surface 4601 gradually increases from the second abutting section 4604 to the first abutting section 4602, and the restoring force of the foldable area 31 gradually decreases from the second abutting section 4604 to the first abutting section 4602.

[0081] The folding device 40 of the electronic device 100 according to the present invention can be synchronously and automatically unfolded by the unfolding force between the second cam 4730 of the folding assistance component 41 and the abutting curved surface 4601 and the resilience of the foldable area 31. The user can flatten the electronic device 100 automatically with one-handed operation, which is convenient to use and improves the user experience. Secondly, since the overall volume of the folding device 40 is small, the internal space of the folding housing 20 occupied by the folding device 40 is reduced, which is not only beneficial to the layout of other components such as the main board or battery in the electronic device 100, but also conducive to miniaturization development.

[0082] The above is the implementation manner of the embodiments of the present invention. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the principle of the embodiments of the present invention, several improvements and retouches can be made, and these improvements and retouches are also regarded as the protection scope of the present invention.

Claims

1. A folding device, characterized in that, the folding device comprises: a base; a rotating shaft, the rotating shaft being connected to the base; a connecting rod member, the connecting rod member being rotatably connected to the rotating shaft relative to the base; a resisting member, the resisting member being axially slidably connected to the rotating shaft along the axial direction of the rotating shaft; and an elastic member, the elastic member being used to push the resisting member to abut against the connecting rod member; wherein, the connecting rod member and the resisting member are connected through the cooperation of a first cam and a second cam, the first cam has an abutting curved surface, and the second cam can slidably abut against the abutting curved surface; when the folding device is in a non-flattened state, there is an unfolding force between the second cam and the abutting curved surface, and the unfolding force is used to drive the connecting rod member to rotate relative to the base towards the flattened state of the folding device.

2. The folding device according to claim 1, characterized in that, the abutting curved surface includes a first abutting section and a second abutting section located at opposite ends thereof. When the folding device is in a flattened state, the second cam abuts against the first abutting section; when the folding device is in a folded state, the second cam abuts against the second abutting section; the second cam can automatically slide from the second abutting section to the first abutting section under the abutting force of the elastic member, so as to drive the connecting rod member to automatically rotate relative to the base and flatten.

3. The folding device according to claim 2, characterized in that, the first cam is provided on the connecting rod member, the second cam is provided on the resisting member, and the second abutting section is closer to the resisting member than the first abutting section.

4. The folding device according to claim 2, characterized in that, the inclination angle of the abutting curved surface gradually increases from the second abutting section to the first abutting section, and the unfolding force gradually increases as the second cam slides from the second abutting section to the first abutting section.

5. The folding device according to claim 1, characterized in that, the first cam includes at least one first protruding portion, the abutting curved surface is provided at one end of the first protruding portion facing the second cam, the second cam includes at least one second protruding portion, and the second protruding portion has a sliding surface facing the first cam, and the sliding surface can slidably abut against the abutting curved surface.

6. The folding device according to claim 1, characterized in that, the first cam includes two first protruding portions, the two first protruding portions are arranged circumferentially along the rotating shaft, and one end of each first protruding portion facing the second cam is provided with the abutting curved surface; the second cam includes two second protruding portions, the two second protruding portions are arranged circumferentially along the rotating shaft, each second protruding portion has a sliding surface facing the corresponding first cam, and the two sliding surfaces respectively slidably abut against the two abutting curved surfaces.

7. The folding device according to claim 1, characterized in that, The link member includes a first sleeve, the first sleeve is sleeved on the rotating shaft and can rotate around the axis of the rotating shaft. The abutting member includes a second sleeve, the second sleeve is sleeved on the rotating shaft and can slide axially along the rotating shaft. The first cam is provided on the first sleeve, the second cam is provided on the second sleeve, and the first cam, the second cam and the rotating shaft are coaxial.

8. The folding device according to claim 1, wherein, the folding device includes two of the rotating shafts, two of the link members and a gear set. One of the link members is rotatably connected to one of the rotating shafts relative to the base, and the other link member is rotatably connected to the other rotating shaft relative to the base. The gear set is provided between the two link members, and the two link members can rotate synchronously relative to the base through the gear set.

9. The folding device according to claim 8, wherein, each of the link members includes the first cam rotatably sleeved on the corresponding rotating shaft, the abutting member includes two of the second cams located at its opposite ends, the two second cams are respectively slidably sleeved on the two rotating shafts, and one of the second cams slidably abuts against one of the abutting surfaces, and the other second cam slidably abuts against the other abutting surface.

10. A folding housing, wherein, the folding housing includes the folding device according to any one of claims 1-9 and two frames, the folding device is located between the two frames, and the two frames are respectively connected to opposite sides of the folding device.

11. The folding housing according to claim 10, wherein, one of the two frames is provided with a first magnetic attraction member, and the other is provided with a second magnetic attraction member. When the folding housing is in a folded state, the first magnetic attraction member and the second magnetic attraction member attract each other, and the attraction force between the first magnetic attraction member and the second magnetic attraction member is greater than or equal to the unfolding force between the second cam of the folding device and the abutting surface, so that the folding housing maintains the folded state.

12. The folding housing according to claim 11, wherein, when the two frames are unfolded relative to each other until there is no attraction force between the first magnetic attraction member and the second magnetic attraction member, the unfolding force between the second cam and the abutting surface drives the second cam to slide on the abutting surface, so that the link member rotates automatically relative to the base, so that the two frames rotate and unfold automatically relative to each other.

13. An electronic device, wherein, the electronic device includes a flexible screen, two frames and the folding device according to any one of claims 1-9, the folding device is located between the two frames, and opposite sides of the folding device are respectively connected to the two frames, and the flexible screen is disposed on the two frames and the folding device.

14. The electronic device according to claim 13, wherein, The flexible screen includes a bendable area disposed on a folding device of the folding housing. One of the two frames is provided with a first magnetic attraction member, and the other is provided with a second magnetic attraction member. When the electronic device is in a folded state, the attraction force between the first magnetic attraction member and the second magnetic attraction member is greater than or equal to the sum of the unfolding force between the second cam of the folding device and the abutting curved surface and the resilience of the bendable area, so that the electronic device maintains the folded state.

15. The electronic device according to claim 14, wherein, when the two frames are unfolded relative to each other until there is no attraction force between the first magnetic attraction member and the second magnetic attraction member, the unfolding force and the resilience jointly drive the automatic unfolding of the folding device, so that the two frames are unfolded to a flattened state.

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