CN112154496A - Hinge device, shell and electronic device - Google Patents

Referring to fig. 1 to 4, fig. 1 is a schematic perspective view of an electronic device according to an embodiment of the present disclosure; FIG. 2 is a schematic view of the electronic device in FIG. 1; FIG. 3 is an exploded perspective view of the electronic device of FIG. 1; fig. 4 is an exploded perspective view of the electronic device in fig. 2. The

electronic device

100 in one embodiment of the present application includes a

housing

20 and a

flexible screen

30 disposed on the

housing

20. The

housing

20 includes a

first frame

21, a

second frame

23, and a

hinge device

25 connected between the

first frame

21 and the

second frame

23. The

flexible screen

30 is provided on the

first frame

21, the

second frame

23, and the

hinge device

25. The

flexible screen

30 is provided with a

bendable region

31 corresponding to the hinge means 25, and two

non-bendable regions

33 connected to opposite sides of the

bendable region

31. The

hinge device

25 is configured to be supported by the

flexible screen

30, the

hinge device

25 includes a hinge

main body

250, the hinge

main body

250 is located between the

first frame

21 and the

second frame

23, one side of the hinge

main body

250 is slidably connected to the

first frame

21, and the other side of the hinge

main body

250 opposite to the first side is connected to the

second frame

23. At least one

elastic member

26 is disposed between the

first frame body

21 and the hinge

main body

250, and the at least one

elastic member

26 pushes the

first frame body

21 away from the hinge

main body

250, so that the region of the

flexible screen

30 corresponding to the hinge

main body

250 is always kept in the unfolded state, thereby preventing the

flexible screen

30 from separating from the hinge

main body

250 and arching. Due to the sliding connection between the

first frame body

21 and the hinge

main body

250 and the

elastic member

26 arranged between the

first frame body

21 and the hinge

main body

250, the tolerance of the hinge

main body

250 in the direction perpendicular to the bending axis thereof can be compensated, that is, the length of the hinge

main body

250 extending in the direction perpendicular to the bending axis thereof can be automatically adjusted, so as to avoid the flexible screen from being damaged.

The bending axis is not limited to a solid axis, but may be a non-solid axis, i.e., a virtual axis, and may be considered as a bending axis as long as the

hinge body

250 can be bent around the axis.

In this embodiment, the bending axis of the

hinge body

250 is a virtual axis.

In this embodiment, the

electronic device

100 is a mobile phone. It is understood that in other embodiments, the

electronic device

100 may be, but is not limited to, a radiotelephone, a pager, a Web browser, a notepad, a calendar, and/or a Global Positioning System (GPS) receiver PDA.

One side of the

hinge body

250 of the

hinge device

25 of the

electronic device

100 of the present application is slidably connected to the

first frame

21, the other side of the

hinge body

250 opposite to the

first frame

21 is connected to the

second frame

23, and an

elastic member

26 is elastically disposed between the

first frame

21 and the

hinge body

250. Therefore, the accumulated tolerance of the entire length of the hinge

main body

250 in the direction perpendicular to the bending axis thereof can be compensated by the sliding of one side of the hinge

main body

250 with respect to the

first frame body

21, i.e., the sliding of the

first frame body

21 can absorb the accumulated tolerance of the entire length; in addition, the

elastic member

26 always pushes the

housing

20 away from the hinge

main body

250, so that the

flexible screen

30 on the

housing

20 always keeps the unfolded state, and thus the

flexible screen

30 can be prevented from being separated from the hinge

main body

250 and arching, and the flexible screen is prevented from being damaged.

In this embodiment, one side of the

hinge body

250 parallel to the bending axis thereof is slidably connected to the

first frame

21 through the

elastic member

26, and the other side of the

hinge body

250 parallel to the bending axis thereof is fixedly connected to the

second frame

23, that is, the

hinge body

250 is slidable with respect to the

first frame

21.

In other embodiments, one side of the

hinge body

250 parallel to the bending axis thereof is slidably connected to the

second frame

23 through the

elastic member

26, and the other side of the

hinge body

250 parallel to the bending axis thereof is slidably connected to the

first frame

21 through the

elastic member

26, that is, the

hinge body

250 is slidable relative to the

first frame

21 and the

second frame

23.

The

first frame

21 is provided with a first connecting

portion

212 on a side adjacent to the

hinge device

25, and the first connecting

portion

212 is used for connecting a side of the hinge

main body

250 parallel to the bending axis. Specifically, the first connecting

portion

212 includes connecting

strips

2121 protruding from opposite ends of a side of the

first frame

21 adjacent to the

hinge device

25, and a

guide plate

2125 connected between the two connecting

strips

2121. Each connecting

bar

2121 extends along a direction perpendicular to the bending axis of the

hinge body

250, and the guide-

sliding plate

2125 is adjacent to the front surface of the

first frame

21, so that a

receiving groove

2126 is defined between the guide-

sliding plate

2125 and the two connecting

bars

2121 and the

first frame

21. A

sliding groove

2122 is formed along the length direction of the connecting

strip

2121 on a side surface of each connecting

strip

2121 facing the

receiving groove

2126, and the

sliding groove

2122 is communicated with the

receiving groove

2126. At least one receiving

groove

2127 is formed on the back surface of the

sliding guide

2125 along the extending direction of the

sliding groove

2122, and the receiving

groove

2127 is communicated with the

receiving groove

2126. A

positioning post

214 corresponding to the

receiving groove

2127 is protruded from a side surface of the

first frame

21 facing the

receiving groove

2126. The front surface of the

first frame

21 is provided with a

mounting groove

215 for mounting the

flexible screen

30.

In this embodiment, the back surface of the

guide sliding plate

2125 is provided with two parallel and spaced receiving

grooves

2127, and two

positioning posts

214 corresponding to the two receiving

grooves

2127 are protruded from the side surface of the

first frame

21 facing the

receiving groove

2126.

The

second frame

23 is provided with a second connecting

portion

232 at a side adjacent to the

hinge device

25, and the second connecting

portion

232 is used for connecting the other side of the hinge

main body

250 parallel to the bending axis. Specifically, the second connecting

portion

232 includes two connecting

bars

2321 respectively protruding from two opposite ends of one side of the

second frame

23 adjacent to the

hinge device

25, and a connecting

plate

2325 connected between the two connecting

bars

2321. Each connecting

bar

2321 extends in a direction perpendicular to the bending axis of the

hinge body

250, and the connecting

plate

2325 is adjacent to the front surface of the

second frame body

23, so that a connecting

slot

2326 is defined between the connecting

plate

2325 and the two connecting

bars

2321 and the

second frame body

23. The connecting

plate

2325 is provided with a plurality of connecting

holes

2327, and the front surface of the

second frame

23 is provided with an

installation groove

235 for installing the

flexible screen

30. In the present application, the front face refers to a face facing the same direction as the light emitting face of the

flexible screen

30, and the back face refers to a face facing the opposite direction to the light emitting face of the

flexible screen

30.

Referring to fig. 5 to 8, fig. 5 is an exploded perspective view of the hinge device of the electronic device in fig. 4; FIG. 6 is an exploded perspective view of another perspective of the hinge assembly of the electronic device of FIG. 5; fig. 7 is an enlarged view of a VII portion in fig. 6; fig. 8 is an enlarged view of a portion VIII in fig. 6.

Hinge assembly

25 still includes two chain link

end cover mechanisms

255, two

elastic component

26 and a

positioning mechanism

27, two chain link

end cover mechanisms

255 set up respectively in the relative both ends of hinge

main part

250, two

elastic component

26 set up in hinge

main part

250 with between the

first framework

21,

positioning mechanism

27 is used for keeping

hinge assembly

100's form, promptly,

positioning mechanism

27 is used for keeping

hinge assembly

100 is the state of buckling or expandes, and convenience of customers uses. The

positioning mechanism

27 includes a plurality of

elastic positioning members

28 and a plurality of

magnetic members

29.

In this embodiment, each

elastic member

26 is a spring.

In other embodiments, the

resilient member

26 may be a resilient rubber or a resilient plastic, or the like.

The

hinge body

250 includes a plurality of links hinged to each other, and the front surface of each link is used to support the

flexible panel

30. Specifically, the plurality of links includes at least a

first link

251, at least a

second link

252, a

third link

253, and a

fourth link

254. One side of the

third link

253 is slidably connected to the

first frame

21, and one side of the

fourth link

254 is connected to the

second frame

23. First link 251 is disposed between

third link

253 and

fourth link

254,

second link

252 is disposed between

third link

253 and

first link

251 or between

fourth link

254 and

first link

251, and adjacent links are hinged to each other. In one embodiment, at least one of the

second links

252 is hinged to a side of the

first link

251, the

third link

253 is hinged to the

second link

252 or to a side of the

first link

251 remote from the

second link

252, and the

fourth link

253 is hinged to the

second link

252 or to a side of the

first link

251 remote from the

second link

252.

In this embodiment, the

hinge body

250 includes one

first link

251, two

second links

252, one

third link

253 and one

fourth link

254, the two

second links

252 are respectively hinged to two opposite sides of the

first link

251, the

third link

253 is hinged to one side of one

second link

252 away from the

first link

252, and the

fourth link

254 is hinged to one side of the other

second link

252 away from the

first link

252.

Specifically, the

first link

251 includes a

strip

2510 along a bending axis parallel to the

hinge body

250, and the

strip

2510 includes a front 2511 in the shape of a circular arc, a back, two

opposite side

2512 surfaces, and two opposite end surfaces 2513. The

front surface

2511 and the two

side surfaces

2512 are connected by two first

guide sliding surfaces

2514 which are opposite, each first

guide sliding surface

2514 is an arc surface which is recessed towards the

strip body

2510, and the two first

guide sliding surfaces

2514 are symmetrical along the central line of the

front surface

2511. Each first

guiding sliding surface

2514 is provided with a

receiving hole

2515 adjacent to the two

end surfaces

2513. Each

end surface

2513 is provided with a circular arc-shaped limiting

groove

2517 adjacent to two first

guide sliding surfaces

2514, the circular arc of each limiting

groove

2517 is parallel to the circular arc of the adjacent first

guide sliding surface

2514, that is, the circular arc center of each limiting

groove

2517 coincides with the circular arc center of the adjacent first

guide sliding surface

2514. Each

end surface

2513 is further provided with a connecting

hole

2518, and the connecting

hole

2518 is located between the two limiting

grooves

2517. Fixing

grooves

2501 are respectively formed in two opposite sides of the

first chain link

251, specifically, fixing

grooves

2501 are respectively formed at the intersection of the back surface of the

first chain link

251 and the two

side surfaces

2512, and each fixing

groove

2501 extends along the length direction of the

first chain link

251. Specifically, each retaining

slot

2501 is located at the intersection of the middle of the back face of the

first link

251 and the

side face

2512.

Each

second link

252 includes a

bar

2520 extending along a bending axis parallel to the

hinge body

250, the

bar

2520 including a

front surface

2521 in the shape of a circular arc, a back surface, two

opposite side surfaces

2522, and two opposite end surfaces 2523. A circular arc-shaped second sliding

guide surface

2524 is disposed between the

front surface

2521 and one

side surface

2522, and the second sliding

guide surface

2524 is recessed toward the

strip

2520. The second sliding

guide surface

2524 is provided with a

receiving hole

2525 adjacent to the two

end surfaces

2523. A sliding

guide strip

2526 is arranged at the intersection of the

front surface

2521 and the

other side surface

2522 in an outward protruding manner, the sliding

guide strip

2526 extends along the length direction of the

strip body

2520, an

arc surface

2527 is arranged on one side of the sliding

guide strip

2526, which faces away from the

front surface

2521, and the

arc surface

2527 can be attached to the first sliding

guide surface

2514 in a sliding manner, that is, the radian of the

arc surface

2527 is the same as that of the first sliding

guide surface

2514. Each

end surface

2523 is provided with an arc-shaped limiting

groove

2528 adjacent to the second sliding

guide surface

2524, and an arc of the limiting

groove

2528 is parallel to an arc of the second sliding

guide surface

2524, that is, the arc centers of the limiting

groove

2528 and the second sliding

guide surface

2524 are coincident. Each

end surface

2523 is further provided with a connecting

hole

2529, and specifically, the connecting

hole

2529 is located in the middle of the

end surface

2523. A fixing

groove

2503 is formed at a side of each

second link

252 facing the

first link

251, specifically, a fixing

groove

2503 is formed at an intersection of a back surface of each

second link

252 and two

side surfaces

2522, each fixing

groove

2503 extends along a length direction of the

second link

252, and specifically, each fixing

groove

2503 is located at an intersection of a middle portion of the back surface of the

second link

252 and the side surfaces 2522.

Referring to fig. 5 and 13 together, fig. 12 is a cross-sectional view taken along line XII-XII in fig. 1; fig. 13 is an enlarged view taken along XIII in fig. 12. The

arc surface

2527 of each

second link

252 is provided with a

first positioning hole

2502 and a

second positioning hole

2504 spaced from each other at a position adjacent to the two

end surfaces

2523, and the

first positioning hole

2502 and the second positioning hole 2054 correspond to the

receiving hole

2515 of the

first link

251. The

first positioning hole

2502 and the

second positioning hole

2504 are located on the same arc line of the

arc surface

2527, the

first positioning hole

2502 is far away from the

strip

2520, and the

second positioning hole

2504 is close to the

strip

2520.

The

third link

253 includes a

strip

2530 extending parallel to the bending axis of the

hinge body

250, and the

strip

2530 includes a

front surface

2531 having a circular arc shape, a rear surface, two

opposite side surfaces

2532, and two opposite end surfaces 2533. The crossing of

front

2531 and one of them

side

2532 is equipped with a

draw runner

2534 to the evagination,

draw runner

2534 follows the length direction of the

strip body

2530 extends,

draw runner

2534 sets up

arc surface

2535 back to one side of

front

2531,

arc surface

2535 can laminate in on the

second draw runner

2524, promptly, the circular arc of

arc surface

2535 with the circular arc of

second draw runner

2524 is the same. Each

end surface

2533 is further provided with a connecting

hole

2536, and specifically, the connecting

hole

2536 is located in the middle of the

end surface

2533. The

strip

2530 is provided with a mounting portion on a

side

2532 facing away from the

slide bar

2534, the mounting portion being slidably connected to the

first connection portion

212 of the

first frame

21. The mounting portion includes a sliding

plate

2537 protruding from the

side surface

2532, and at least one

protrusion

2538 protruding from the sliding

plate

2537. Two opposite ends of the sliding

plate

2537 are slidably inserted into the sliding

grooves

2122 of the two connecting

strips

2121 of the

first frame

21, and the at least one

protrusion

2538 corresponds to the

positioning column

214 of the

first frame

21. A fixing

groove

2505 is formed at the intersection of the back surface of the

third link

253 and the

side surface

2532 on which the sliding

guide strip

2534 is protruded, and the fixing

groove

2505 extends along the length direction of the

third link

253. Specifically, the fixing

groove

2505 is located at the intersection of the middle portion of the back surface of the

third link

253 and the

side surface

2532.

The

arc surface

2535 of the

third link

253 is provided with a

first positioning hole

2502 and a

second positioning hole

2504 adjacent to the two

end surfaces

2533, which are spaced from each other, respectively, and the

first positioning hole

2502 and the second positioning hole 2054 correspond to the

receiving hole

2525 of the

second link

252. The

first positioning hole

2502 and the

second positioning hole

2504 are located on the same arc line of the

arc surface

2535, the

first positioning hole

2502 is far away from the

strip body

2530, and the

second positioning hole

2504 is close to the

strip body

2530.

In this embodiment, the sliding

plate

2537 is provided with two spaced

protrusions

2538, and the two

protrusions

2538 correspond to the two

positioning posts

214 on the

first frame

21.

The

fourth link

254 includes a

strip

2540 extending parallel to the bending axis of the

hinge body

250, and the

strip

2540 includes a

front surface

2541 in the shape of a circular arc, a rear surface, two

opposite side surfaces

2542, and two opposite end surfaces 2543. A sliding

guide strip

2544 is arranged between the

front surface

2541 and one

side surface

2542 in an outward protruding manner, the sliding

guide strip

2544 extends along the length direction of the

strip body

2540, the sliding

guide strip

2544 faces back to one side of the

front surface

2541 and is provided with an

arc surface

2545, the

arc surface

2545 can be attached to the second sliding

guide surface

2524, that is, the arc of the

arc surface

2545 is the same as the arc of the second sliding

guide surface

2524. Each

end surface

2543 is further provided with a connecting

hole

2546, and specifically, the connecting

hole

2546 is located in the middle of the

end surface

2543. The

strip

2540 is back to the

side

2542 of the

slide bar

2544 and is provided with a mounting portion connected to the second connecting

portion

232 of the

second frame

23. The installation department is including protruding locating a mounting

panel

2547 of

side

2542, a plurality of connecting

holes

2548 have been seted up on the mounting

panel

2547. A fixing

groove

2506 is formed at the intersection of the back surface of the

fourth link

254 and the

side surface

2542 on which the

slide guide bar

2544 is disposed, and the fixing

groove

2506 extends along the length direction of the

fourth link

254. Specifically, the fixing

groove

2506 is located at the intersection of the middle portion of the back surface of the

fourth link

254 and the

side surface

2542.

The

arc surface

2545 of the

fourth link

254 is provided with a

first positioning hole

2502 and a

second positioning hole

2504 adjacent to the two

end surfaces

2543, which are spaced from each other, respectively, and the

first positioning hole

2502 and the second positioning hole 2054 correspond to the

receiving hole

2525 of the

second link

252. The

first positioning hole

2502 and the

second positioning hole

2504 are located on the same arc line of the

arc surface

2545, the

first positioning hole

2502 is far away from the

strip body

2540, and the

second positioning hole

2504 is close to the

strip body

2540.

Each link

end cap mechanism

255 includes at least one first

link end cap

256, at least one second

link end cap

257, and two third link end caps 258. At least one of said first link end caps 256 is disposed on one of the end faces 2513 of at least one of said

first links

251; at least one of said second link

end cap members

257 is disposed on one of the end surfaces 2523 of at least one of said

second links

252 and is rotatably connected to first link

end cap member

256; two of the third

link end caps

258 are disposed on one of the end surfaces 2533 of the

third link

253 and one of the end surfaces 2543 of the

fourth link

254, respectively, wherein one of the third link end caps 258 is rotatably connected to the first

link end cap

256 or the second

link end cap

257, and the other third

link end cap

258 is rotatably connected to the first

link end cap

256 or the second

link end cap

257.

As shown in fig. 7 and 8, in the present embodiment, the

hinge device

25 includes two link

end cap mechanisms

255, and each link

end cap mechanism

255 includes one first

link end cap

256, two second link end caps 257, and two third link end caps 258. The first

link end cap

256 can be fixed to an

end surface

2513 of the

first link

251, the two second

link end caps

257 can be fixed to end

surfaces

2523 of the same ends of the two

second links

252, respectively, and the two third

link end caps

258 can be fixed to an

end surface

2533 of the

third link

253 and an

end surface

2543 of the

fourth link

254, respectively. Adjacent link end caps are hingedly connected to one another.

Specifically, first

link end cap

256 includes a

cover plate

2560, and the shape and size of the end surface of

cover plate

2560 facing

first link

251 are the same as the shape and size of

end surface

2513 of

first link

251. The

cover

2560 includes a front 2561, a

back

2562, two

opposite sides

2562, and two

opposite end

2563. The

front surface

2561 and the two

opposite side surfaces

2562 are connected by two opposite

slide guide surfaces

2564, each

slide guide surface

2564 is an arc surface, and the arc surface is the same as the arc of the corresponding first

slide guide surface

2514 on the

first chain link

251. The two

glide surfaces

2564 are symmetrical about a center line of the

front surface

2561. The

end surface

2563 of the

cover plate

2560 facing the

first link

251 and adjacent to the two

slide guiding surfaces

2564 are respectively provided with a circular arc-shaped

slide guiding slot

2567, the circular arc of each

slide guiding slot

2567 is parallel to the circular arc of the adjacent

slide guiding surface

2564, that is, each

slide guiding slot

2567 coincides with the center of the circular arc of the adjacent

slide guiding surface

2564. Each

guide slot

2567 extends through an

adjacent guide surface

2564. The

end surface

2563 of the

cover plate

2560 facing away from the

first link

251 is provided with a

countersunk hole

2568, the countersunk

hole

2568 penetrates through the

cover plate

2560, and specifically, the countersunk

hole

2568 is located between the two

slide guide slots

2567.

Each second link

end cap member

257 includes a

cover plate

2570, the shape and size of the end surface of the

cover plate

2570 facing the

second link

252 is similar to the shape and size of the

end surface

2523 of the

second link

252. The

cover plate

2570 includes a

front surface

2571, a back surface, two

opposite side surfaces

2572, and two opposite end surfaces 2573. The intersection of the

front surface

2571 and one of the side surfaces 2572 is provided with a circular arc-shaped sliding

guide surface

2574, and the circular arc of the sliding

guide surface

2574 is the same as the circular arc of the corresponding second sliding

guide surface

2524 on the

second link

252. The crossing department of

front

2571 and another

side

2572 is equipped with a

slip strip

2576 to the evagination,

slip strip

2576 dorsad the one side of front 2571 sets up

arc surface

2577,

arc surface

2577 can laminate in on the

slip surface

2564 of leading of first chain link

end cover piece

256, promptly, the circular arc of

arc surface

2577 with the circular arc of leading

slip surface

2564 is the same. The

arc surface

2577 is gone up to the evagination and is equipped with

stopper

2575 of L shape,

stopper

2575 is located including the

projection arc surface

2577's connecting portion, and certainly the terminal orientation of connecting portion the spacing portion that one side of

second chain link

252 extended, connecting portion can accept with sliding in the

guide slot

2567 of first chain link

end cover piece

256, spacing portion can accept with sliding in the

spacing groove

2517 of

first chain link

251. The

end surface

2573 of the

cover plate

2570 facing the

second link

252, which is adjacent to the

arc surface

2574, is provided with an arc-shaped

guide slot

2578, the arc of the

guide slot

2578 is parallel to the arc of the

guide sliding surface

2574, that is, the arc centers of the

guide slot

2578 and the

guide sliding surface

2574 are overlapped, and the

guide slot

2578 penetrates through the

guide sliding surface

2574. A

countersunk hole

2579 is formed in an

end surface

2573 of the

cover plate

2570 facing away from the

second link

252, and the countersunk

hole

2579 penetrates through the

cover plate

2570.

Each third

link end cap

258 includes a

cover plate

2580, and the

cover plate

2580 includes a

front surface

2581, a back surface, two opposing

side surfaces

2582, and two opposing end surfaces 2583. A sliding

guide strip

2586 is arranged at the intersection of the

front surface

2581 and one

side surface

2582 of the

front surface

2581 in an outward protruding manner, an

arc surface

2587 is arranged on one side of the sliding

guide strip

2586 back to the

front surface

2581, the

arc surface

2587 can be attached to the sliding

guide surface

2574 of the second link

end cover member

257, that is, the arc of the

arc surface

2587 is the same as the arc of the sliding

guide surface

2574. The last evagination of

arc surface

2587 is equipped with

stopper

2585 of L shape,

stopper

2585 is located including protruding

arc surface

2587's connecting portion, and certainly the terminal orientation of connecting portion the spacing portion that hinge

main part

250 extends, connecting portion can receive slidingly accept in the

spout

2578 of second chain link

end cover member

257, spacing portion can slidingly accept in the

spacing groove

2528 of

second chain link

252. The

cover

2580 has a

counter bore

2589 on an

end surface

2583 facing away from the

hinge body

250, and the

counter bore

2589 penetrates through the

cover

2580.

Referring to fig. 9, fig. 9 is an enlarged view of the positioning element in fig. 7. These

positioning members

28 are respectively disposed between the chain links of the

hinge body

250, that is, a positioning

member

28 is disposed between every two adjacent chain links, and these

positioning members

28 are used for positioning the hinge device in a bent state or an unfolded state. Specifically, the

positioning members

28 are slidably received in the receiving

holes

2515 of the

first links

251 and the receiving

holes

2525 of the

second links

252, respectively. The

positioning element

28 has elasticity, and when the

positioning element

28 is pressed, the

positioning element

28 retracts into the receiving

holes

2515 and 2525, and when the pressing of the

positioning element

28 is released, the

positioning element

28 elastically resets. The positioning

member

28 includes a

positioning rod

282 slidably received in the receiving

holes

2515 and 2525, and an

elastic member

284 sleeved on the

positioning rod

282. The

elastic member

284 elastically abuts between the

positioning rod

282 and the back surface of the

corresponding receiving hole

2515, 2525, and the

elastic member

284 forces the

positioning rod

282 to move outward and extend out of the

corresponding receiving hole

2515, 2525. One end of the

positioning rod

282 away from the

elastic element

284 is provided with a spherical

convex hull

285, and the

elastic element

284 forces the

positioning rod

282 to move outwards so that the

convex hull

285 extends out of the corresponding receiving

holes

2515 and 2525. When the

convex hulls

285 of the

positioning pieces

28 are respectively clamped into the corresponding

first positioning holes

2502, the area of the hinge

main body

250 is always kept in the unfolded state, so that the hinge

main body

250 is automatically kept in the unfolded state; when the

convex hulls

285 of the positioning

member

28 are respectively snapped into the corresponding

second positioning holes

2504, the region of the hinge

main body

250 is always kept in the bent state, so that the hinge

main body

250 is automatically kept in the bent state.

In this embodiment, the

elastic member

284 is a spring.

In other embodiments, each

positioning element

28 is a resilient positioning bead, the resilient positioning bead can be respectively clamped in the

corresponding receiving hole

2515, 2525, and the bead body of the resilient positioning bead extends out of the

corresponding receiving hole

2515, 2525.

In other embodiments, each first

guiding sliding surface

2514 of the

first link

251 is provided with a first positioning hole and a second positioning hole, which are spaced from each other, respectively, and the first positioning hole and the second positioning hole are located on the same arc line of the first

guiding sliding surface

2514, the first positioning hole is adjacent to one side of the

front surface

2511, and the second positioning hole is far away from one side of the

front surface

2511. An

elastic positioning element

28 is disposed on the

arc surface

2527 of each

second link

252, and when the

hinge body

250 is in the unfolded state, the

positioning element

28 is positioned in the first positioning hole, and when the

hinge body

250 is in the bent state, the

positioning element

28 is positioned in the second positioning hole.

In other embodiments, the second sliding

guide surface

2524 of each

second link

252 is respectively formed with a first positioning hole and a second positioning hole, which are spaced apart from each other, and the first positioning hole and the second positioning hole are located on the same arc line of the second sliding

guide surface

2524, the first positioning hole is adjacent to one side of the

front surface

2521, and the second positioning hole is away from one side of the

front surface

2521. An

elastic positioning part

28 is arranged on the

arc surface

2535 of the

third chain link

253 or the

arc surface

2545 of the

fourth chain link

254, when the hinge

main body

250 is in the unfolding state, the

positioning part

28 is positioned in the first positioning hole, and when the hinge

main body

250 is in the bending state, the

positioning part

28 is positioned in the second positioning hole.

The

magnetic members

29 may be magnetic strips capable of attracting each other. The

magnetic members

29 are respectively disposed on a plurality of links of the

hinge body

250, such that a pair of the

magnetic members

29 is disposed between each adjacent two of the links. Specifically, the

magnetic members

29 may be fixed in the fixing

grooves

2501, 2503, 2505, and 2506, respectively. When the

hinge device

100 is bent, the side surface of each link is fixed to the side surface of an adjacent link through magnetic attraction, that is, a plurality of links of the hinge

main body

250 are in a bent state, and the

magnetic members

29 between every two adjacent links of the hinge

main body

250 are attracted to each other, so that the

hinge device

100 automatically maintains the bent state.

In this embodiment, the

magnetic members

29 are four pairs of magnetic strips that are attracted to each other.

In other embodiments, the

magnetic members

29 are pairs of magnets and iron bars that can be attracted to each other, and each pair of magnets and iron bars is disposed between two adjacent links.

As shown in fig. 4, in this embodiment, a supporting

sheet

35 is attached to the back of the

flexible screen

30, and the supporting

sheet

35 covers the

bendable region

31 of the

flexible screen

30. The

support sheet

35 may be a thin metal sheet such as copper foil, liquid metal sheet, memory alloy sheet, plastic sheet or other suitable material. In this embodiment, the supporting

sheet

35 is a liquid metal sheet.

The reason why the liquid metal sheet is selected as the

support sheet

35 in this embodiment is that the liquid metal sheet has better wear resistance. On one hand, the

support piece

35 can effectively resist the friction generated by the

hinge device

25, and is not easy to wear; on the other hand, the liquid metal sheet has a low elastic modulus, and when the

electronic device

100 is bent by the

hinge device

25, the supporting

sheet

35 can be stretched synchronously or approximately synchronously with the

flexible screen

30, so as to avoid the situation that the

flexible screen

30 is damaged due to a large difference in stretching amplitude when being bent. The liquid metal can be copper-based, titanium-based, iron-based, zirconium-based, silver-based, nickel-based, gallium-based, gold-based, antimony-based, cadmium-based, zinc-based, indium-based, silicon-based and other liquid metals, and compared with the existing materials with lower elastic modulus, such as silica gel, foam, plastic and the like, the liquid metal has higher strength and better wear resistance, and can effectively support the flexible screen.

Referring to fig. 5 to 14, during assembly, the

hinge body

250 is assembled first, that is, the

positioning elements

28 are respectively installed in the receiving

holes

2515 of the

first chain link

251 and the receiving

holes

2525 of the

second chain link

252, each

positioning element

28 can slide along the corresponding receiving

hole

2515, 2525, and the

convex protrusions

285 extend out of the corresponding receiving

holes

2515, 2525. At this time, the

second link

252 is rotatable relative to the

first link

251 along a first axis L1 (shown in fig. 11), the first axis L1 is an axis of a virtual shaft, the first axis L1 is located inside the

flexible screen

30, and specifically, the first axis L1 is located on a back surface of the

flexible screen

30 and is close to the

flexible screen

30. Attaching the

arc surface

2527 of each

second chain link

252 to the first sliding

guide surface

2514 of the

first chain link

251, so that the

convex hulls

285 of the

positioning members

28 on the

first chain link

251 are respectively clamped into the

first positioning holes

2502 of the corresponding second chain links 252; at this time, the

third link

253 is rotatable relative to the corresponding

second link

252 along a second axis L2 (shown in fig. 11), the second axis L2 is an axis of the virtual shaft, the second axis L2 is located inside the

flexible screen

30, and specifically, the first axis L2 is located on the back surface of the

flexible screen

30 and is close to the

flexible screen

30. Attaching the

arc surface

2535 of the

third link

253 to the second sliding

guide surface

2524 of one of the

second links

252, so that the

convex hull

285 of the

positioning element

28 on the

second link

252 is clamped into the corresponding

first positioning hole

2502 of the

third link

253; then, the

arc surface

2545 of the

fourth chain link

254 is attached to the second sliding

guide surface

2524 of another

second chain link

252, so that the

convex hull

285 of the

positioning element

28 on the

second chain link

252 is clamped into the corresponding

first positioning hole

2502 of the

fourth chain link

254; at this time, the

fourth link

254 is rotatable relative to the corresponding

second link

252 along a second axis L2, the second axis L2 is an axis of the virtual shaft, the second axis L2 is located inside the

flexible screen

30, and specifically, the first axis L2 is located on a back surface of the

flexible screen

30 and is close to the

flexible screen

30.

Assembling each link

end cover mechanism

255, namely, slidably attaching the arc surfaces 2577 of the two second link

end cover members

257 to the two

slide guide surfaces

2564 of the first link

end cover member

256, respectively, so that the

stopper

2575 of each second link

end cover member

257 is accommodated in the

slide guide groove

2567 of the first link

end cover member

256, the connecting part of each

stopper

2575 is accommodated in the

slide guide groove

2567, and the limiting part of each

stopper

2575 extends out of the

end surface

2563 of the first link

end cover member

256; the arc surfaces 2587 of the two third link

end cover members

258 are respectively attached to the sliding

guide surfaces

2574 of the two second link

end cover members

257 in a sliding manner, so that the

stop block

2585 of each third link

end cover member

258 is accommodated in the corresponding sliding

guide groove

2578 of the second link

end cover member

257, the connecting part of each

stop block

2585 is accommodated in the sliding

guide groove

2578, and the stop part of each

stop block

2585 extends out of the

end surface

2573 of the corresponding second link

end cover member

257. The two link end cover mechanisms 255 are connected to two opposite ends of the hinge body 250, that is, the stopper portion of the stopper 2575 of each second link end cover member 257 is slidably inserted into the corresponding stopper groove 2517 of the first link 251, the stopper portion of the stopper 2585 of each third link end cover member 258 is slidably inserted into the corresponding stopper groove 2528 of the corresponding second link 252, each first link end cover member 256 is attached to the end surface 2513 of the first link 251, and the countersunk hole 2568 of the first link end cover member 256 faces the connecting hole 2518; each second link end cap member 257 abuts end surface 2523 of second link 252 and counter-sunk hole 2579 of second link end cap member 257 faces connecting hole 2529; two of the third link end caps 258 respectively engage end surfaces 2533 of the third links 253, and the countersunk hole 2589 of each third link end cap 258 faces the connecting hole 2536, and the other two of the third link end caps 258 respectively engage end surfaces 2543 of the fourth links 254, and the countersunk hole 2589 of each third link end cap 258 faces the corresponding connecting hole 2546; a plurality of fasteners are respectively fastened through countersunk holes 2568, 2579 and 2589 in corresponding connecting holes 2518, 2529, 2536 and 2546, so that the first link 251, the second link 252, the third link 253 and the fourth link 254 are rotatably connected to one body, and the first link end cover 256, the two second link end covers 257 and the two pairs of third link end covers 258 of each link end cover mechanism 255 are rotatably connected to one body. At this time, the

convex hulls

285 of the

positioning members

28 on both sides of the

first chain link

251 are respectively clamped into the corresponding

first positioning holes

2502 on the two second chain links 252, wherein the

convex hull

285 of the positioning

member

28 on one

second link

252 snaps into the

first positioning hole

2502 of the

third link

253, the

convex hull

285 of the positioning

member

28 on the other

second link

252 snaps into the

first positioning hole

2502 of the

fourth link

254, so that the

first chain link

251, the two second chain links 252, the

third chain link

253 and the

fourth chain link

254 are connected in a horizontal state, the limiting part of the limiting

block

2575 on each second chain link

end cover member

257 abuts against one end of the corresponding limiting

groove

2517 far away from the

front surface

2511, the limiting part of the limiting

block

2585 on each third chain link

end cover member

258 abuts against one end of the corresponding limiting

groove

2528 far away from the

front surface

2521, thereby connecting first

link end cap

256, second

link end cap

257, and third

link end cap

258 in a horizontal position.

The plurality of

magnetic members

29 are fixed in the fixing

grooves

2501, 2503, 2505, and 2506 of the first, second, third, and

fourth links

251, 252, 253, respectively. A pair of

magnetic members

29 attracted to each other is formed between the

first chain link

251 and each

second chain link

252, wherein a pair of

magnetic members

29 attracted to each other is formed between one

second chain link

252 and the

third chain link

253, and a pair of

magnetic members

29 attracted to each other is formed between the other

second chain link

252 and the

fourth chain link

254.

In this embodiment, each

magnetic member

29 is fixed in the corresponding fixing groove by means of glue connection.

Placing the mounted

hinge device

25 between the

first frame body

21 and the

second frame body

23; the opposite ends of the sliding

plates

2537 of the

third link

253 of the

hinge device

25 are slidably inserted into the sliding

grooves

2122 of the two connecting

bars

2121 of the

first frame

21; the two

elastic members

26 are respectively accommodated in the two

accommodating grooves

2127, such that one end of each

elastic member

26 is fixed on the

corresponding positioning pillar

214, and the other end is connected to the

corresponding bump

2538. At this time, the

slide plate

2537 is slidably accommodated in the

accommodating groove

2126 along the

slide groove

2122. The mounting

plate

2547 of the

fourth link

254 is received in the connecting

slot

2326 of the

second frame

23, and a plurality of fasteners pass through the mounting

plate

2547 and are respectively fastened in the connecting

holes

2327, so as to fix the mounting

plate

2547 to the second frame. The back surfaces of the two

non-bent regions

33 of the

flexible panel

30 are respectively attached to the mounting

grooves

215 of the

first frame

21 and the mounting

grooves

235 of the

second frame

23, and the back surface of the

bendable region

31 of the

flexible panel

30 is attached to the front surface of the hinge

main body

250. At this time, the

bendable region

31 of the

flexible screen

30 can be bent along with the bending of the hinge

main body

250, and the two

elastic members

26 elastically push the

first frame

21 away from the hinge

main body

250, so that the

flexible screen

30 is always kept in the unfolded state, which not only can compensate for the tolerance of the

hinge device

25 in the direction perpendicular to the bending axis thereof, but also can prevent the

flexible screen

30 from separating from the hinge

main body

250 and arching, thereby avoiding the damage of the flexible screen.

Referring to fig. 15 to 18, fig. 15 is a perspective view illustrating a bent state of the electronic device in fig. 1; FIG. 16 is a cross-sectional view taken along line XVI-XVI in FIG. 15; FIG. 17 is a cross-sectional view taken along line XVII-XVII in FIG. 15; fig. 18 is a sectional view taken along line XVIII-XVIII in fig. 15. When the

electronic device

100 is bent, a bending force is applied to the

electronic device

100, so that the

convex hull

285 of each

positioning element

28 on the

first chain link

251 is separated from the clamping with the corresponding

first positioning hole

2502 on the

second chain link

252 and slides along the

corresponding arc surface

2527, and the

elastic element

284 of each

positioning element

28 is elastically deformed; the arc surfaces 2527 of the two

second links

252 respectively rotate along the two first sliding

guide surfaces

2514 of the

first link

251 to approach each other, and the arc surfaces 2577 of the two second link end covers 257 respectively rotate along the two sliding

guide surfaces

2564 of the first

link end cover

256 to approach each other; the connecting part of the

stopper

2575 on each second link

end cover member

257 slides along the

guide slot

2567 of the corresponding first link

end cover member

256, and the limiting part of the

stopper

2575 slides along the corresponding limiting

slot

2517 on the

first link

251; and the

magnetic members

29 between the

first link

251 and the

second link

252 are close to each other to increase the attraction force. Wherein the

convex hull

285 of each

positioning element

28 on a

second chain link

252 slides along the

arc surface

2535 without being clamped with the corresponding

first positioning hole

2502 on the

third chain link

253, and the

elastic element

284 of each

positioning element

28 is elastically deformed; the

arc surface

2535 of the

third link

253 rotates along the second sliding

guide surface

2524 of the corresponding

second link

252 to move toward the middle of the

hinge body

250, and the

arc surface

2587 of each third

link end cap

258 connected to the

third link

253 rotates along the sliding

guide surface

2574 of the corresponding second

link end cap

257 to move toward the middle of the

hinge body

250; the connecting portion of the

stop block

2585 connected to each third link

end cover member

258 of the

third link

253 slides along the

slide guide groove

2578 of the corresponding second link

end cover member

257, and the stop portion of the

stop block

2585 slides along the

corresponding stop groove

2528 of the

second link

252; the

magnetic members

29 between the

third link

253 and the

second link

252 are close to each other so that the attractive force is increased. Meanwhile, the

convex hull

285 of each

positioning element

28 on the other

second chain link

252 is separated from the clamping with the corresponding

first positioning hole

2502 on the

fourth chain link

254 and slides along the

arc surface

2545, and the

elastic element

284 of each

positioning element

28 is elastically deformed; the

arc surface

2545 of the

fourth link

254 rotates along the second sliding

guide surface

2524 of the corresponding

second link

252 to move toward the middle of the

hinge body

250, and the

arc surface

2587 of each third

link end cap

258 connected to the

fourth link

253 rotates along the sliding

guide surface

2574 of the corresponding second

link end cap

257 to move toward the middle of the

hinge body

250; the connecting portion of the

stop block

2585 attached to each third

link end cap

258 of the

fourth link

254 slides along the

guide slot

2578 of the corresponding second

link end cap

257, and the stop portion of the

stop block

2585 slides along the

corresponding stop slot

2528 of the

second link

252; and the

magnetic members

29 between the

fourth link

254 and the

second link

252 are close to each other so that the attractive force is increased.

When the

convex hull

285 of the positioning

member

28 on the first chain link 251 passes over the arc top of the

arc surface

2527 of the

second chain link

252, the

magnetic member

29 between each

second chain link

252 and the

first chain link

251 is magnetically attracted, so that the arc surfaces 2527 of the two second chain links 252 continuously slide along the first sliding

guide surfaces

2514 to approach each other, and the

elastic member

284 of the positioning

member

28 is partially elastically restored to push the second chain links 252 to continuously rotate toward the adjacent first chain links 251; the

stop block

2575 of each second link

end cover member

257 slides along the

corresponding stop groove

2517 until the

convex protrusions

285 of the positioning

member

28 on the

first link

251 respectively face the second positioning holes 2504 on the

second links

252, the

elastic member

284 of the positioning

member

28 elastically resets and is clamped into the corresponding

second positioning holes

2504, each

stop block

2575 slides along the

corresponding stop groove

2517 and abuts against one end of the

stop groove

2517 adjacent to the

front surface

2511, and the

magnetic members

29 between the

first link

251 and each

second link

252 are attached to each other. Wherein the

convex hull

285 of the positioning

member

28 on a

second link

252 passes over the arc tip of the

arc surface

2535 of the

third link

253, the

magnetic member

29 between the

second link

252 and the

third link

253 is magnetically attracted, so that the

arc surface

2535 of the

third link

253 continues to slide along the second sliding

guide surface

2524 and moves toward the middle of the

hinge body

250, and the

elastic component

284 of the

positioning component

28 is partially elastically restored to push the

third link

253 to continue to move toward the middle adjacent to the

hinge body

250 until the

convex protrusions

285 of the

positioning component

28 on the

second link

252 respectively face the second positioning holes 2504 on the

third link

253, the

elastic component

284 of the

positioning component

28 is elastically restored to be clamped into the corresponding

second positioning holes

2504, each limiting

block

2585 slides along the corresponding limiting

groove

2528 to abut against one end of the limiting

groove

2528 adjacent to the

front surface

2521, and the

magnetic members

29 between the

second chain link

252 and the

third chain link

253 are attached and attracted to each other. The

convex hull

285 of the locating

member

28 on the other

second link

252 passes over the arc tip of the

arc surface

2545 of the

fourth link

254, the

magnetic member

29 between the

second link

252 and the

fourth link

254 is magnetically attracted, so that the

arc surface

2545 of the

fourth link

254 continues to slide along the second sliding

guide surface

2524 and moves toward the middle of the

hinge body

250, and the

elastic component

284 of the

positioning component

28 is partially elastically restored to push the

fourth link

253 to move continuously toward the middle part adjacent to the

hinge body

250 until the

convex protrusions

285 of the

positioning component

28 on the

second link

252 respectively face the second positioning holes 2504 on the

fourth link

254, the

elastic component

284 of the

positioning component

28 is elastically restored to be clamped into the corresponding

second positioning holes

2504, each limiting

block

2585 slides along the corresponding limiting

groove

2528 to abut against one end of the limiting

groove

2528 adjacent to the

front surface

2521, and the

magnetic members

29 between the

second link

252 and the

fourth link

254 are attached to each other. At this time, the hinge main body 250 is bent, and the flexible screen 30 is bent along with the hinge main body 250; the convex hulls 285 of the positioning elements 28 are respectively clamped into the corresponding second positioning holes 2504 and the magnetic elements 29 to be mutually adsorbed, so that the electronic device 100 is kept in a bent state; the sliding plate 2537 slides in the direction of the first frame 21, and the sliding plate 2537 pushes the elastic member 26 to compress the elastic member 26; the front surface 2511 of the first chain link 251, the front surfaces 2521 of the two second chain links 252 and the front surfaces 2531 of the two third chain links 253 are connected with each other to form an arched surface, that is, the front surface 2511 of the first chain link 251, the front surfaces 2521 of the two second chain links 252 and the front surfaces 2531 of the two third chain links 253 share a circular arc surface, so as to be convenient for fitting the flexible screen 30; the front surface 2561 of the first link end cover 256, the front surfaces 2571 of the two second link end covers 257 and the front surfaces 2581 of the two second link end covers 258 are connected to form an arc surface, that is, the front surfaces 2561 of the first link end cover 256, the front surfaces 2571 of the two second link end covers 257 and the front surfaces 2581 of the two second link end covers 258 share an arc surface, so as to facilitate the fitting of the flexible screen 30; the first frame body 21 rotates with the third link 253, and the second frame bodies 23 approach each other as the fourth link 254 rotates.

When the electronic device 100 needs to be unfolded, the first frame body 21 and the second frame body 23 are pulled apart, wherein the convex hull 285 of each positioning element 28 on one second link 252 is separated from being held by the second positioning hole 2504 of the third link 253 and slides along the corresponding arc surface 2535, the elastic element 284 of each positioning element 28 is elastically deformed, the arc surface 2535 of the third link 253 rotates along the second sliding guide surface 2524 of the corresponding second link 252 and moves away from the middle of the hinge body 250, and the arc surface 2587 of each third link end cover 258 connected to the third link 253 rotates along the sliding guide surface 2574 of the corresponding second link end cover 257 and moves away from the middle of the hinge body 250; the connecting portion of the stop block 2585 connected to each third link end cover 258 of the third link 253 slides along the guide slot 2578 of the corresponding second link end cover 257, and the stop portion of the stop block 2585 slides along the corresponding stop slot 2528 of the second link 252, so that the magnetic member 29 between the third link 253 and the second link 252 is separated from the attraction by external force and moves away from each other, thereby continuously reducing the attraction force. The

convex hull

285 of each positioning

member

28 on another

second link

252 slides along the

corresponding arc surface

2545 without being held by the

second positioning hole

2504 of the

fourth link

254, the

elastic member

284 of each positioning

member

28 elastically deforms, the

arc surface

2545 of the

fourth link

254 rotates along the second sliding

guide surface

2524 of the corresponding

second link

252 to move away from the middle of the

hinge body

250, and the

arc surface

2587 of each third

link end cover

258 connected to the

fourth link

254 rotates along the sliding

guide surface

2574 of the corresponding second

link end cover

257 to move away from the middle of the

hinge body

250; the connection portion of the

stop block

2585 connected to each third

link end cover

258 on the

fourth link

254 slides along the

guide slot

2578 of the corresponding second

link end cover

257, and the stop portion of the

stop block

2585 slides along the

corresponding stop slot

2528 on the

second link

252, so that the

magnetic member

29 between the

fourth link

254 and the

second link

252 is separated from the attraction and separated from each other, thereby continuously reducing the attraction force. The

convex hull

285 of each

positioning element

28 on the

first chain link

251 slides along the

corresponding arc surface

2527 without being clamped with the corresponding

first positioning hole

2502 on the

second chain link

252, and the

elastic element

284 of each

positioning element

28 is elastically deformed; the arc surfaces 2527 of the two

second links

252 respectively rotate along the two first sliding

guide surfaces

2514 of the

first link

251 to be away from each other, and the arc surfaces 2577 of the two second link end covers 257 respectively rotate along the two sliding

guide surfaces

2564 of the first

link end cover

256 to be away from each other; the connection portion of the

stopper

2575 of each second link

end cover member

257 slides along the

corresponding guiding slot

2567 of the first link

end cover member

256, and the stopper portion of the

stopper

2575 slides along the corresponding

stopper slot

2517 of the

first link

251, so that the magnetic force of the

magnetic member

29 between the

first link

251 and the

second link

252 is reduced continuously due to the detachment and the mutual separation of the magnetic member from the magnetic member.

When the

convex hull

285 of the positioning

member

28 on the

first link

251 passes over the arc top of the

arc surface

2527 of the

second link

252, the attractive force of the

magnetic member

29 between the

first chain link

251 and each

second chain link

252 is reduced continuously, the

elastic member

284 of the positioning

member

28 still generates a pushing force against the

arc surface

2527, so that the arc surfaces 2527 of the two second chain links 252 continue to slide along the first sliding

guide surface

2514 and move away from each other, the

stop block

2575 of each second chain link

end cover member

257 slides along the

corresponding stop groove

2517 until the

convex protrusions

285 of the positioning

member

28 on the

first chain link

251 respectively face the

first positioning holes

2502 on the second chain links 252, the

elastic member

284 of the positioning

member

28 elastically resets to clamp the

convex protrusions

285 into the corresponding

first positioning holes

2502, each

stop block

2575 slides along the

corresponding stop groove

2517 and abuts against one end of the

stop groove

2517, which is far from the

front surface

2511, and the

first chain link

251 and the two second chain links 252 are in a horizontal state. The

convex hull

285 of the

positioning element

28 on a

second link

252 crosses the arc top of the

arc surface

2535 of the

third link

253, the magnetic force of the

magnetic element

29 between the

third link

252 and the

second link

252 reduces the pushing force of the

elastic element

284 of the

positioning element

28 against the

arc surface

2535, so that the

arc surface

2535 of the

third link

253 continues to slide along the second sliding

guide surface

2524 and moves towards the middle part away from the

hinge body

250 until the

convex hull

285 of the

positioning element

28 on the

second link

252 respectively faces the

first positioning hole

2502 on the

third link

253, the

elastic element

284 of the

positioning element

28 elastically resets to clip the

convex hull

285 into the corresponding

first positioning hole

2502, each

stopper

2585 slides along the corresponding limiting

groove

2528 and abuts against one end of the limiting

groove

2528 away from the

front surface

2521, and the

third link

253, the

first link

251 and the

second link

252 are in a horizontal state. The

convex hull

285 of the

positioning element

28 on another

second link

252 passes over the arc top of the

arc surface

2545 of the

fourth link

254, the magnetic force of the

magnetic element

29 between the

fourth link

254 and the

second link

252 reduces the pushing force of the

elastic element

284 of the

positioning element

28 against the

arc surface

2545, so that the

arc surface

2545 of the

fourth link

254 continues to slide along the second sliding

guide surface

2524 and moves towards the middle part away from the

hinge body

250 until the

convex hulls

285 of the

positioning element

28 on the

second link

252 respectively face the

first positioning holes

2502 on the

fourth link

254, the elastic element of the

positioning element

28 elastically resets to clip the

convex hulls

285 into the corresponding

first positioning holes

2502, each

stopper

2585 slides along the corresponding limiting

groove

2528 and abuts against one end of the limiting

groove

2528 away from the

front surface

2521, and the

fourth link

254, the

first link

251, the

second link

252 and the

third link

253 are in a horizontal state. At this time, the hinge

main body

250 is unfolded, the

flexible screen

30 is flat along with the hinge

main body

250, and the

magnetic members

29 are spaced from each other; these

positioning members

28 are respectively inserted into the corresponding

first positioning holes

2502 to protect the

electronic device

100 in the unfolded state, i.e., the second link, the third link, the second link, the fourth link, the first link, the second link, the third link, the fourth link, the second link, the fourth link, the third link, the fourth link, the second link, the third link, the fourth link, the second link, the fourth.

Because the

magnetic members

29 are disposed on the

hinge device

25, the

hinge device

25 can be fixed at the bending position by the mutual attraction of the

magnetic members

29, so as to prevent the

hinge device

25 from being opened due to the weight of the whole device or other reasons in the bending state, thereby automatically maintaining the bending state. Also, the

magnetic member

29 is located on the

hinge device

25 without occupying the inner space of the

housing

20, facilitating the arrangement of other electronic components inside the

housing

20. Furthermore, the

magnetic member

29 is located outside the range of the

housing

20, so that the influence of the magnetic force of the

magnetic member

29 on the electromagnetic performance of other electronic devices inside the

housing

20 can be effectively avoided, and the normal operation of the electronic devices can be ensured.

The positioning

member

20 of the embodiment of the present invention can position the

hinge device

25 at the bending position and the unfolding position, respectively, and the elastic force generated by the positioning

member

20 can make the state of the

hinge device

25 at the bending position and the unfolding position more stable, i.e. the

hinge device

25 can be deformed only by applying a certain initial force, so that the hinge device is not easily affected by its own gravity to cause an unexpected unfolding or bending condition.