Foldable electronic device

Abstract

Provided in the present application is a foldable electronic device, comprising two middle frames, a rotating shaft assembly, a flexible circuit board and a flexible screen, wherein the two middle frames are rotatably connected to two sides of the rotating shaft assembly, respectively, and the flexible screen is laid on the two middle frames and the rotating shaft assembly; the rotating shaft assembly comprises a spindle; the flexible circuit board comprises two fixing portions and a first extending section located between the two fixing portions, wherein the first extending section passes through the spindle; each middle frame is connected to a mounting member to which a respective fixing portion is connected, the mounting member comprising a first end and a second end; and when the foldable electronic device is in a flattened state, in a thickness direction of the flexible screen, a distance between the first end and the flexible screen is smaller than or equal to a distance between the second end and the flexible screen; and in the direction parallel to the flexible screen, a distance between the first end and the spindle is larger than a distance between the second end and the spindle, or a direction from the first end to the second end is perpendicular to the flexible screen. Therefore, the foldable electronic device provided in the present application can reduce the probability of damaging a flexible circuit board.

Description

Foldable electronic devices

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on July 17, 2023, with application number 202310877685.7 and application name “Foldable Electronic Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of terminal technology, and in particular to a foldable electronic device. Background Art

[0003] The gradual maturity of flexible screen technology is driving significant changes in the display methods of electronic devices. For example, the emergence of foldable electronic devices, such as foldable phones and computers, allows flexible switching between modes based on different usage scenarios while also offering a high screen-to-body ratio. For example, foldable phones, when folded, can be the size of a traditional phone for easy portability, while unfolding to have the display size of a tablet. These features have made foldable devices highly sought-after products.

[0004] In related art, a foldable electronic device may include two frames, a hinge assembly, and a flexible circuit board. The hinge assembly enables the two frames to rotate relative to each other, allowing them to be folded or unfolded. Electronic components may be placed in each frame, and the flexible circuit board passes through the hinge assembly. The ends of the flexible circuit board extend into the two frames to electrically connect to the corresponding electronic components.

[0005] However, the above-mentioned foldable electronic devices are prone to damage to the flexible circuit board during the folding process.

[0006] Summary of the Invention

[0007] An embodiment of the present application provides a foldable electronic device that can reduce the probability of damage to a flexible circuit board.

[0008] An embodiment of the present application provides a foldable electronic device, including two middle frames, a hinge assembly, a flexible circuit board and a flexible screen, the two middle frames are rotatably connected to the two sides of the hinge assembly, and the flexible screen is laid on the same side of the thickness direction of the two middle frames and the hinge assembly; the hinge assembly includes a main shaft, the flexible circuit board includes two fixed parts and a first extension section located between the two fixed parts, and the first extension section is passed through the main shaft; each middle frame is connected to a mounting part, the fixed part is connected to the mounting part, and the mounting part includes a first end and a second end. When the foldable electronic device is in a flattened state, along the thickness direction of the flexible screen, the distance between the first end and the flexible screen is less than or equal to the distance between the second end and the flexible screen, along the direction parallel to the flexible screen, the distance between the first end and the main shaft is greater than the distance between the second end and the main shaft, or the direction from the first end to the second end is perpendicular to the flexible screen.

[0009] The foldable electronic device provided in an embodiment of the present application may include two middle frames, a hinge assembly, a flexible circuit board, and a flexible screen. The two middle frames are rotatably connected to opposite sides of the hinge assembly, and the flexible screen is arranged on the same side of the thickness direction of the two middle frames and the hinge assembly. The hinge assembly may include a main shaft, and the flexible circuit board may include two fixed portions and a first extension section located between the two fixed portions, with the first extension section extending through the main shaft. A mounting member is connected to each middle frame, and the fixing portion is connected to the mounting member. The mounting member includes a first end and a second end. When the foldable electronic device is in a flattened state, along the thickness direction of the flexible screen, the distance between the first end and the flexible screen is less than or equal to the distance between the second end and the flexible screen. Along the direction parallel to the flexible screen, the distance between the first end and the main axis is greater than the distance between the second end and the main axis, or the direction from the first end to the second end is perpendicular to the flexible screen. By setting the mounting member, when the flexible circuit board is fixed on the mounting member, the flexible circuit board between the middle frame and the second end of the mounting member can be formed into a curved section, and the curved section is fixed by the mounting member so that the curved section is in a fixed state that cannot be deformed, thereby reducing the number of active curved sections of the flexible circuit board between the two middle frames, so that the total number of active curved sections of the flexible circuit board between the two middle frames is small, thereby improving the controllability of the bending shape of each active curved section during the folding or unfolding process of the foldable electronic device, so that there is no need to fix the middle part of the flexible circuit board to the hinge assembly. In addition, since only the two fixed parts of the flexible circuit board are connected to the two mounting parts respectively, and the first extension section of the flexible circuit board is not connected to other structural parts, there is no need to set up a connecting structure for connection, and the distance between the two mounting parts in the direction parallel to the flexible screen is relatively far, so that the space for the first extension section to move in the foldable electronic device is larger, the shape of each curved section of the first extension section is more stretched, and the bending angle is larger, so that the bending stress on the first extension section is smaller, thereby reducing the probability of damage to the first extension section.

[0010] In a possible implementation, the main shaft corresponding to the first extension section has a center line, the center line extends along the extension direction of the main shaft, and the mounting members of the two middle frames are symmetrically arranged on both sides of the center line.

[0011] In this way, during the folding or unfolding process of the foldable electronic device, the forces applied by the two mounting parts to the first extension section are relatively consistent, which helps to control the bending shape of the first extension section and reduce the offset of the first extension section relative to the preset area.

[0012] In a possible embodiment, the rotating shaft assembly includes two supporting door panels, the main shaft includes a connected main inner shaft and a main outer shaft, the main outer shaft is located on the side of the main inner shaft away from the flexible screen, and the two supporting door panels are movably connected to the main shaft, and the two supporting door panels are respectively located on both sides of the main inner shaft, and are spaced apart from the main outer shaft along the thickness direction of the flexible screen; the first extension section is passed between the main inner shaft and the main outer shaft, and between the main outer shaft and the supporting door panels; the main inner shaft, main outer shaft and two supporting door panels corresponding to the first extension section are all symmetrically arranged along the center line.

[0013] In this way, during the folding or unfolding process of the foldable electronic device, the forces exerted on the first extension section by the main inner axis, the main outer axis and the two supporting door panels are relatively consistent, which helps to control the bending shape of the first extension section and reduce the offset of the first extension section relative to the preset area.

[0014] In one possible embodiment, the first extension segment located on one side of the center line includes multiple first sub-extension segments, and the first extension segment located on the other side of the center line includes multiple second sub-extension segments; the first sub-extension segments and the second sub-extension segments correspond one to one, and along the direction parallel to the flexible screen, the distance between the first sub-extension segment and the center line is equal to the distance between the corresponding second sub-extension segment and the center line, and along the thickness direction of the flexible screen, the ratio of the distance between the first sub-extension segment and the flexible screen to the distance between the corresponding second sub-extension segment and the flexible screen is in the range of 0.5-2.

[0015] In this way, the crease light and shadow of the flexible screen can be alleviated, the display effect of the flexible screen can be improved, and the wear and breakage of the first bending section can be alleviated.

[0016] In a possible implementation, the first extension sections are symmetrically arranged along the center line.

[0017] In this way, the crease light and shadow of the flexible screen can be better alleviated, the display effect of the flexible screen can be improved, and the wear and breakage of the first bending section can be better alleviated.

[0018] In a possible embodiment, the main outer axis includes two first main outer axis portions and a second main outer axis portion located between the two first main outer axis portions, the two first main outer axis portions are located on the side of the second main outer axis portion close to the flexible screen, and extend toward the flexible screen; the first extension section includes two first bending sections and a second bending section located between the two first bending sections, the first bending sections correspond one-to-one to the first main outer axis portions and bend toward the flexible screen, and the second bending sections correspond to the second main outer axis portion and bend toward away from the flexible screen.

[0019] In this way, the first and second main outer shaft portions help control the bending configuration of the first and second curved segments.

[0020] In one possible embodiment, the first extension section includes two third curved sections, one third curved section is located on a side of the first curved section away from the second curved section; the third curved sections correspond one-to-one to the second ends of the mounting member, and the third curved sections are bent in a direction away from the flexible screen.

[0021] In this way, the second end of the mounting member helps to control the bending shape of the third curved segment.

[0022] In a possible embodiment, in the same mounting member, the second end includes a first mounting portion, a bent portion, and a second mounting portion connected in sequence, the first mounting portion is connected to the first end, and the second mounting portion is located on one side of the first mounting portion in the thickness direction.

[0023] Thus, the second mounting portion of the mounting member increases the thickness of the second end of the mounting member, thereby improving the structural strength of the mounting member. The curved portion prevents the sharp second end of the mounting member from cutting and damaging the first extension section, thereby protecting the first extension section.

[0024] In a possible implementation, a surface of the bent portion close to the flexible printed circuit board is a curved surface.

[0025] In this way, the force exerted by the bending portion on the first extension section can be made more uniform, thereby preventing the bending portion from causing stress concentration in the first extension section and damaging the first extension section.

[0026] In one possible embodiment, each middle frame is connected to a clamping member. On the same side of the main axis, the mounting member is located on the side of the fixed portion close to the flexible screen, and the clamping member is located on the side of the fixed portion away from the flexible screen. In this way, the fixed portion can be fixed by the clamping member and the clamping member.

[0027] In one possible embodiment, the flexible circuit board includes two second extension sections, one second extension section is located on a side of a fixed portion away from the first extension section, each middle frame has a accommodating cavity, and each middle frame is provided with a connecting member on the side close to the main shaft, and the connecting member is located on the side of the rotating shaft assembly away from the flexible screen; on the same side of the main shaft, the outer surface of the middle frame facing the main shaft has a mating surface, and there is a through hole between the connecting member and the mating surface, the through hole is connected to the accommodating cavity, the clamping member covers part of the through hole, and has a gap between it and the mating surface, and the second extension section passes through the gap and extends into the accommodating cavity.

[0028] In one possible embodiment, the mating surface includes a first mating end proximal to the flexible screen and a second mating end distal to the flexible screen, with the first mating end tilted toward the main axis. This facilitates installation of other structural components on the mating surface and helps increase the thickness of the sidewall of the middle frame corresponding to the mating surface, thereby enhancing the structural strength of the sidewall.

[0029] In one possible embodiment, an auxiliary mounting part is provided at the first end of each mounting part. On the same side of the main axis, the auxiliary mounting part is located between the second extension section and the mating surface, and part of the clamping part is located on the side of the second extension section away from the flexible screen. A sealing part is provided between the auxiliary mounting part and the mating surface, between the auxiliary mounting part and the second extension section, and between the clamping part and the second extension section.

[0030] In this way, it can help prevent external water and dust from entering the corresponding middle frame's accommodating cavity through the gap between the clamping part and the corresponding mating surface, thereby improving the waterproof and dustproof performance of the foldable electronic device and improving the working stability of the foldable electronic device.

[0031] In a possible implementation, the foldable electronic device further includes a reinforcing member, and the reinforcing member is located on at least one side in the thickness direction of the fixing portion.

[0032] In this way, by providing the reinforcing piece, the structural strength of the fixing portion can be improved, thereby protecting the fixing portion and reducing the difficulty of installing the fixing portion.

[0033] The construction of the present application as well as other objects and advantageous effects will become more apparent through the description of the preferred embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1 is a partial cross-sectional view of a foldable electronic device in a flattened state provided by the related art;

[0035] FIG2 is a schematic structural diagram of a foldable electronic device in a folded state provided by an embodiment of the present application;

[0036] FIG3 is a schematic structural diagram of a foldable electronic device in an intermediate state provided by an embodiment of the present application;

[0037] FIG4 is a schematic structural diagram of a foldable electronic device in a flattened state provided by an embodiment of the present application;

[0038] FIG5 is a schematic diagram of a disassembled foldable electronic device provided in an embodiment of the present application;

[0039] FIG6 is a top view of the foldable electronic device provided by an embodiment of the present application with the back cover removed;

[0040] FIG7 is a top view of a flexible circuit board provided in an embodiment of the present application, which is inserted into a rotating shaft assembly;

[0041] FIG8 is a schematic diagram of a partial structure of a flexible circuit board provided in an embodiment of the present application, wherein the flexible circuit board is inserted into a rotating shaft assembly;

[0042] FIG9 is a schematic diagram of another partial structure of a flexible circuit board provided in an embodiment of the present application, wherein the flexible circuit board is inserted through a rotating shaft assembly;

[0043] FIG10 is a partially exploded schematic diagram of a flexible circuit board and a rotating shaft assembly provided in an embodiment of the present application;

[0044] FIG11 is a partially exploded schematic diagram of a flexible circuit board, a main shaft, a mounting member, and a clamping member provided in an embodiment of the present application;

[0045] FIG12a is a schematic diagram of an exploded view of a flexible circuit board, a middle frame, a connector, a mounting member, and a clamping member provided in an embodiment of the present application;

[0046] FIG12b is a schematic diagram of a partial structure of FIG12a;

[0047] FIG12c is a partially exploded schematic diagram of the flexible circuit board, middle frame, connector, mounting member, and clamping member provided in an embodiment of the present application;

[0048] FIG13a is a schematic diagram of a partial structure of a foldable electronic device with a back cover removed provided by an embodiment of the present application;

[0049] FIG13b is a schematic diagram of a partial structure of a mounting member provided in an embodiment of the present application, in which the mounting member is disposed at a through hole;

[0050] FIG14 is a schematic diagram of a partial structure of a mounting member and an auxiliary mounting member provided in an embodiment of the present application, in which the mounting member and the auxiliary mounting member are arranged at a through hole;

[0051] FIG15 is a partial cross-sectional view of a foldable electronic device in a flattened state provided by an embodiment of the present application;

[0052] FIG16 is another partial cross-sectional view of the foldable electronic device in a flattened state provided by an embodiment of the present application;

[0053] FIG17 is another partial cross-sectional view of the foldable electronic device provided by an embodiment of the present application in a flattened state;

[0054] FIG18 is a partial cross-sectional view of a foldable electronic device in a folded state provided by an embodiment of the present application;

[0055] FIG19 is another partial cross-sectional view of the foldable electronic device provided by an embodiment of the present application in a flattened state;

[0056] FIG20 is another partial cross-sectional view of the foldable electronic device provided by an embodiment of the present application in a flattened state;

[0057] Figure 21 is another partial cross-sectional view of the foldable electronic device provided in an embodiment of the present application in a flattened state.

[0058] Explanation of Reference Numerals: 11a: first frame; 11b: second frame; 111: mounting surface; 1111: first mounting end; 1112: second mounting end; 12: spindle structure; 13: flexible display screen; 14: through-shaft flexible circuit board; 14a: first movable section; 14b: second movable section; 14c: middle portion; 15: door panel; 100: foldable electronic device; 110: back cover; 120: middle frame; 120a: first middle frame; 120b: second middle frame; 121: accommodating cavity; 122: mating surface; 122a: first mating surface; 122b: second mating surface; 1221: first mating end; 1222: second mating end; 130: connector; 130a: first connector; 130b: second connector; 140: Rotating shaft assembly; 141: Main shaft; 1411: Main inner shaft; 1412: Main outer shaft; 1412a: First main outer shaft portion; 1412b: Second main outer shaft portion; 1412c: Shaft body; 1412d: Protective member; 142: Support door panel; 142a: First support door panel; 142b: Second support door panel; 143: Support frame; 143a: First support frame; 143b: Second support frame; 144: Linking member; 144a: First linking member; 144b: Second linking member; 145: Swinging member; 145a: First swinging member; 145b: Second swinging member; 150: Flexible screen; 160: Flexible circuit board; 161: First extension section; 1611: First sub-extension section; 1612: Second sub-extension section; 162: second extension section; 163: fixing portion;1631: First fixing portion; 1632: Second fixing portion; 160a: First curved section; 160b: Second curved section; 160c: Third curved section; 160d: Fourth curved section; 171: Mounting member; 171a: First mounting member; 171b: Second mounting member; 1711: First end; 1712: Second end; 1712a: First mounting portion; 1712b: Second mounting portion; 1712c: Curved portion; 172: Clamping member; 172a: First clamping member; 172b: Second clamping member; 173: Reinforcement member; 174: Auxiliary mounting member; 174a: First auxiliary mounting member; 174b: Second auxiliary mounting member; 181: Through hole; 181a: First through hole; 181b: Second through hole; 182: Gap; 182a: First gap; 182b: Second gap; 183: Sealing member; 184: Wiring space; 1841: First wiring space; 1842: Second wiring space; 1843: Third wiring space; 1844: Fourth wiring space; 1845: Fifth wiring space; 185: Via hole; 185a: First via hole; 185b: Second via hole; 186: Shield space; 187: Avoidance groove; 188: Adhesive; 191: Battery; 192: Circuit board; 194: Fastener. DETAILED DESCRIPTION

[0059] The terms used in the implementation section of this application are only used to explain the specific embodiments of this application and are not intended to limit this application.

[0060] Referring to Figure 1, the foldable electronic device may include a first frame 11a, a second frame 11b, a main axis structure 12, a flexible display screen 13, and a through-axis flexible circuit board 14. A first electronic component is disposed in the first frame 11a, and a second electronic component is disposed in the second frame 11b. The first frame 11a and the second frame 11b are respectively located on both sides of the main axis structure 12 in the width direction, and are rotatably connected through the main axis structure 12. The middle portion 14c of the through-axis flexible circuit board 14 passes through the main axis structure 12, one end of the through-axis flexible circuit board 14 extends into the first frame 11a and is electrically connected to the first electronic component, and the other end of the through-axis flexible circuit board 14 extends into the second frame 11b and is electrically connected to the second electronic component, thereby realizing the electrical connection between the first electronic component and the second electronic component through the through-axis flexible circuit board 14. The outer surfaces of the first and second frames 11a and 11b facing the spindle structure 12 have mounting surfaces 111. Mounting surfaces 111 include a first mounting end 1111 proximal to the flexible display 13 and a second mounting end 1112 distal to the flexible display 13. First mounting end 1111 is tilted toward the spindle structure 12. The ends of a through-axis flexible printed circuit board 14 are connected to the mounting surfaces 111 of the first and second frames 11a and 11b, respectively. The middle portion 14c of the through-axis flexible printed circuit board 14 is connected to the spindle structure 12, thereby ensuring positioning of the through-axis flexible printed circuit board 14.

[0061] However, taking the through-axis flexible circuit board 14 on one side of the main axis structure 12 (the left side of FIG. 1 ) as an example, since the first mounting end 1111 near the flexible display screen 13 is tilted toward the main axis structure 12, when the through-axis flexible circuit board 14 is fixed to the mounting surface 111, the through-axis flexible circuit board 14 between the mounting surface 111 and the main axis structure 12 will extend approximately along the mounting surface 111 toward the flexible display screen 13, and change its extension direction at position A near the door panel 15 to form a curved segment. This curved segment is not fixed but is in a deformable and active state, thereby increasing the number of active curved segments of the through-axis flexible circuit board 14 located between the two mounting surfaces 111, resulting in a large total number of curved segments of the through-axis flexible circuit board 14 between the two mounting surfaces 111, resulting in a low controllability of the curved shape of each curved segment during the folding or unfolding process of the foldable electronic device. The middle portion 14c of the through-axis flexible circuit board 14 can be fixed to the main shaft structure 12, so that the number of active bending segments of the through-axis flexible circuit board 14 between the middle portion 14c and the mounting surface 111 is reduced, thereby improving the controllability of the bending shape of each active bending segment during the folding or unfolding of the foldable electronic device. Specifically, the through-axis flexible circuit board 14 between the middle portion 14c and the two mounting surfaces 111 can include a first active segment 14a and a second active segment 14b, respectively. Both the first active segment 14a and the second active segment 14b are not connected to other structural components and are in an active state. However, when the middle portion 14c of the through-axis flexible circuit board 14 is fixed, since the distance between the main axis structure 12 and the mounting surface 111 along the direction parallel to the flexible display screen 13 is relatively close, the space for the first movable segment 14a and the second movable segment 14b to move is relatively small, so that the shapes of the various bending segments of the first movable segment 14a and the second movable segment 14b are relatively compact, and the bending angles are relatively small, which can easily lead to local excessive bending, thereby causing the first movable segment 14a and the second movable segment 14b to be subjected to greater bending stress, which can easily damage the first movable segment 14a and the second movable segment 14b.

[0062] Based on the above problems, an embodiment of the present application provides a foldable electronic device, which may include two middle frames, a hinge assembly, a flexible circuit board and a flexible screen. The two middle frames are rotatably connected to the two sides of the hinge assembly, and the flexible screen is laid on the same side of the thickness direction of the two middle frames and the hinge assembly. The hinge assembly may include a main shaft, and the flexible circuit board includes two fixed parts and a first extension section located between the two fixed parts, and the first extension section is passed through the main shaft. A mounting member is connected to each middle frame, and the fixed part is connected to the mounting member. The mounting member includes a first end and a second end. When the foldable electronic device is in a flattened state, along the thickness direction of the flexible screen, the distance between the first end and the flexible screen is less than or equal to the distance between the second end and the flexible screen. Along the direction parallel to the flexible screen, the distance between the first end and the main shaft is greater than the distance between the second end and the main shaft, or the direction from the first end to the second end is perpendicular to the flexible screen. By providing a mounting member, when the flexible circuit board is secured to the mounting member, a curved section can be formed in the flexible circuit board between the middle frame and the second end of the mounting member. This curved section is secured by the mounting member, maintaining a fixed, non-deformable state. This reduces the number of active curved sections of the flexible circuit board between the two middle frames, resulting in a smaller total number of active curved sections between the two middle frames. This improves the controllability of the bending shape of each active curved section during the folding or unfolding of the foldable electronic device, eliminating the need for a fixed connection between the middle portion of the flexible circuit board and the hinge assembly. Furthermore, because only the two fixed portions of the flexible circuit board are connected to the two mounting members, respectively, while the first extension section of the flexible circuit board is not connected to other structural members, a connecting structure is not required. Furthermore, the two mounting members are relatively far apart in a direction parallel to the flexible screen. This provides more space for the first extension section to move in the foldable electronic device, allowing the curved sections of the first extension section to have a more flexible shape and a larger bending angle, resulting in less bending stress on the first extension section, thereby reducing the probability of damage to the first extension section.

[0063] The foldable electronic device 100 provided in an embodiment of the present application is described below with reference to Figures 1 to 21.

[0064] An embodiment of the present application provides a foldable electronic device 100, which may include but is not limited to a foldable fixed terminal or mobile terminal such as a mobile phone, a tablet computer, a laptop computer, an ultra-mobile personal computer (UMPC), a handheld computer, a touch-screen TV, a walkie-talkie, a netbook, a POS machine, a personal digital assistant (PDA), a wearable device, a virtual reality device, etc.

[0065] 1 and 2 , the foldable electronic device 100 may include a hinge assembly 140 and a middle frame 120. There may be at least one middle frame 120. In some examples, the middle frame 120 may include one, and one middle frame 120 may be rotatably connected to the hinge assembly 140, so that the hinge assembly 140 and the middle frame 120 can be folded or unfolded. In another example, the middle frame 120 may include two, for example, the two middle frames 120 may include a first middle frame 120a and a second middle frame 120b, and the first middle frame 120a and the second middle frame 120b may be located on either side of the hinge assembly 140. The first middle frame 120a and the second middle frame 120b may be rotatably connected to the hinge assembly 140, so that the first middle frame 120a and the second middle frame 120b can rotate relative to each other. When the foldable electronic device 100 is in a folded state, the first middle frame 120a and the second middle frame 120b are folded relative to each other into two layers. In some other examples, the number of middle frames 120 of the foldable electronic device 100 can be greater than 2, which means that the number of at least one of the first middle frame 120a and the second middle frame 120b can be multiple, and the adjacent first middle frames 120a and the second middle frames 120b are rotatably connected by a hinge assembly 140, so that the foldable electronic device 100 can be folded into a multi-layer form. For example, the foldable electronic device 100 may include two first middle frames 120a, one second middle frame 120b and two hinge assemblies 140. The two first middle frames 120a are located on both sides of the second middle frame 120b, and the two first middle frames 120a are rotatably connected to the second middle frame 120b through a hinge assembly 140 respectively. One of the first middle frames 120a can be folded relative to the second middle frame 120b, and the other first middle frame 120a can also be folded relative to the second middle frame 120b, so that when the foldable electronic device 100 is in a folded state, the two first middle frames 120a and the second middle frame 120b are folded relative to each other into a three-layer form.

[0066] The embodiment of the present application is described by taking the number of the middle frames 120 as two as an example.

[0067] Referring to Figure 2, the first middle frame 120a and the second middle frame 120b can be folded relative to each other to a closed state. For example, when the first middle frame 120a and the second middle frame 120b are in the closed state, the two can be closed together (a slight deviation is also allowed). At this time, the foldable electronic device 100 is in a closed state, also called a folded state.

[0068] 4 , the first middle frame 120a and the second middle frame 120b can be unfolded relative to each other to an open state. For example, when the first middle frame 120a and the second middle frame 120b are in the open state, they can be approximately 180° apart (slight deviations are also permitted, such as 165°, 177°, or 185°). In this state, the foldable electronic device 100 is in the open state, also known as the flattened state.

[0069] Referring to Figure 3 , the first middle frame 120a and the second middle frame 120b can rotate relative to each other (fold or unfold) to an intermediate state, so that the foldable electronic device 100 is in the intermediate state. The intermediate state can be any state between the folded state and the flattened state. In other words, the foldable electronic device 100 can switch between the folded state and the flattened state by moving the hinge assembly 140.

[0070] In the embodiment of the present application, referring to FIG4 , the foldable electronic device 100 may include a first direction X, a second direction Y, and a third direction Z, and the first direction X, the second direction Y, and the third direction Z are all different. The first direction X and the second direction Y may be any two different directions parallel to the flexible screen 150, and the third direction Z may be any direction intersecting the flexible screen 150. For example, the first direction X, the second direction Y, and the third direction Z may be perpendicular to each other. For example, the first direction X may be the width direction of the foldable electronic device 100, the second direction Y may be the length direction of the foldable electronic device 100, and the third direction Z may be the thickness direction of the foldable electronic device 100. The length, width, thickness, etc. in the embodiment of the present application are merely for convenience of description and do not imply any limitation on the size. For example, the width may be greater than, equal to, or less than the length.

[0071] 4 and 5 , the foldable electronic device 100 may include a foldable flexible screen 150. The flexible screen 150 may be placed on at least one of the first middle frame 120a and the second middle frame 120b. Furthermore, the flexible screen 150 may be placed on the hinge assembly 140. For example, the flexible screen 150 may be placed on the same side surface of the first middle frame 120a, the second middle frame 120b, and the hinge assembly 140. The first middle frame 120a and the second middle frame 120b may be used to support the planar area of ​​the flexible screen 150. The support provided by the middle frame 120 to the planar portion of the flexible screen 150 may be direct support (e.g., contact and support) or indirect support (e.g., support via an intermediate structural member). For example, when the first middle frame 120a and the second middle frame 120b are folded relative to each other, the flexible screen 150 in the bending area opposite the hinge assembly 140 is bent, and the hinge assembly 140 encloses a screen-accommodating space 186 (Figure 18). At least a portion of the flexible screen 150 in the bending area can be located in the screen-accommodating space 186. When the first middle frame 120a and the second middle frame 120b are unfolded relative to each other, the flexible screen 150 also unfolds.

[0072] For a foldable electronic device 100 with an inward-folding screen, the flexible screen 150 is disposed on the inner surfaces of the first middle frame 120a, the second middle frame 120b, and the hinge assembly 140. For a foldable electronic device 100 with an outward-folding screen, the flexible screen 150 is disposed on the outer surfaces of the first middle frame 120a, the second middle frame 120b, and the hinge assembly 140. The embodiments of the present application are described using the foldable electronic device 100 with an inward-folding screen as an example. When the foldable electronic device 100 is in a folded state, the adjacent and opposing surfaces of the first middle frame 120a and the second middle frame 120b are the inner surfaces of the first middle frame 120a and the second middle frame 120b, respectively. The surface of the hinge assembly 140 on the same side as the inner surfaces of the first middle frame 120a and the second middle frame 120b is the inner surface of the hinge assembly 140. The other surface disposed opposite to the inner surface along the thickness direction of the foldable electronic device 100 is the outer surface.

[0073] In some embodiments, referring to FIG5 , the foldable electronic device 100 may include a back cover 110, a circuit board 192, and a battery 191. For example, the flexible screen 150 may be located on one side of the two middle frames 120, and the back cover 110 may be located on the other side of the two middle frames 120. At least one of the circuit board 192 and the battery 191 may be located between the middle frame 120 and the back cover 110, or may be located between the middle frame 120 and the flexible screen 150.

[0074] It should be understood that the structures illustrated in the embodiments of this application do not constitute specific limitations on the foldable electronic device 100. In other embodiments of this application, the foldable electronic device 100 may include more or fewer components than shown, or may combine or separate certain components, or may have different component arrangements. For example, the foldable electronic device 100 may include devices such as a camera and a flash.

[0075] In some embodiments, referring to Figures 6 and 15 (the cross-sectional view of Figure 15 corresponds to the position of the EE section line in Figure 6), a connector 130 may be provided on the side of each middle frame 120 close to the main axis 141. The connector 130 may be located on the side of the hinge assembly 140 away from the flexible screen 150. When the foldable electronic device 100 is in a flattened state, the connector 130 may be shielded on the side of the hinge assembly 140 away from the flexible screen 150 to protect the hinge assembly 140. The connector 130 may include a first connector 130a and a second connector 130b. The first connector 130a is fixedly connected to the first middle frame 120a, and the second connector 130b is fixedly connected to the second middle frame 120b. For example, the surfaces of the first connecting member 130a and the second connecting member 130b facing the flexible screen 150 and the surfaces of the first middle frame 120a and the second middle frame 120b facing the hinge assembly 140 are jointly enclosed to form a space for accommodating the hinge assembly 140.

[0076] The following describes the rotating shaft assembly 140 provided in an embodiment of the present application.

[0077] In some embodiments, referring to Figures 7-9 , the hinge assembly 140 may include a main shaft 141, which may include a main inner shaft 1411 and a main outer shaft 1412 connected to each other. The main inner shaft 1411 and the main outer shaft 1412 may be arranged opposite each other along the thickness direction of the foldable electronic device 100. The main inner shaft 1411 may be located on a side of the main outer shaft 1412 close to the flexible screen 150. The main shaft 141 can serve as a positioning structure in the hinge assembly 140 to support other structural parts of the hinge assembly 140 in the extension direction of the main shaft 141. In addition, the main shaft 141 can serve as an appearance part of the hinge assembly 140. For example, when the foldable electronic device 100 is in a folded state, the main inner shaft 1411 can be located on the inner side of the hinge assembly 140, and the main inner shaft 1411 can be hidden inside the hinge assembly 140, while the main outer shaft 1412 can be located on the outside of the hinge assembly 140, and the main outer shaft 1412 is exposed to the gap formed when the two middle frames 120 rotate relative to each other, thereby constituting the appearance part of the hinge assembly 140.

[0078] In some embodiments, referring to Figures 9 and 10, the shaft assembly 140 may include a support frame 143, and the number of support frames 143 located on one side of the width direction of the main shaft 141 may be at least one. When the number of support frames 143 on one side of the width direction of the main shaft 141 is multiple, the multiple support frames 143 may be arranged along the extension direction (also the length direction) of the shaft assembly 140. The support frame 143 may be located on at least one side of the width direction of the main shaft 141. The embodiment of the present application is described by taking the support frames 143 located on both sides of the width direction of the main shaft 141 as an example. The support frames 143 on both sides of the main shaft 141 can be rotatably connected to the main shaft 141, so that the two support frames 143 can rotate relative to each other. A support frame 143 can be fixedly connected to a corresponding middle frame 120, and the support frame 143 can be directly connected to the corresponding middle frame 120, or can be indirectly connected through other structural members (for example, a connector 130). When the user drives the two middle frames 120 to rotate relative to each other, the two middle frames 120 can respectively drive the two support frames 143 to rotate relative to each other. For example, the support frames 143 may include a first support frame 143a and a second support frame 143b located on either side of the main shaft 141. The first support frame 143a and the second support frame 143b are both rotatably connected to the main shaft 141. The first support frame 143a can be fixedly connected to the first middle frame 120a, and the second support frame 143b can be fixedly connected to the second middle frame 120b.

[0079] In some embodiments, referring to FIG. 10 , the shaft assembly 140 may include a linkage 144, and the main shaft 141 and the support frame 143 may be rotatably connected via the linkage 144. At least one linkage 144 may be provided between each support frame 143 and the main shaft 141. One end of the linkage 144 may be rotatably connected to the main shaft 141, and the other end of the linkage 144 may be slidably connected to the support frame 143. For example, the linkage 144 may include a first linkage 144a and a second linkage 144b located on both sides of the main shaft 141, the first linkage 144a may be connected to the first support frame 143a and the main shaft 141, and the second linkage 144b may be connected to the second support frame 143b and the main shaft 141.

[0080] In some embodiments, referring to FIG10 , the rotating shaft assembly 140 may include a swinging member 145, and the main shaft 141 and the support frame 143 may be rotatably connected via the swinging member 145. At least one swinging member 145 may be provided between each support frame 143 and the main shaft 141. One end of the swinging member 145 may be rotatably connected to the main shaft 141, and the other end of the swinging member 145 may be rotatably connected to the support frame 143, or may be fixedly connected. For example, the swinging member 145 may include a first swinging member 145a and a second swinging member 145b located on both sides of the main shaft 141, the first swinging member 145a may be connected to the first support frame 143a and the main shaft 141, and the second swinging member 145b may be connected to the second support frame 143b and the main shaft 141.

[0081] When the middle frame 120 is rotated, the middle frame 120 can drive the corresponding support frame 143 to rotate, and the support frame 143 can drive the corresponding swing member 145 and linkage member 144 to rotate relative to the main shaft 141. For example, the shaft assembly 140 may include a hinge assembly, which can be installed between the main inner shaft 1411 and the main outer shaft 1412. The linkage member 144 can be rotatably connected to the hinge assembly to achieve rotational connection with the main shaft 141.

[0082] In some embodiments, referring to FIG10 , the hinge assembly 140 may include two supporting door panels 142 , which may be located between the support frame 143 and the flexible screen 150 , and the supporting door panels 142 may extend along the extension direction of the main shaft 141 . When the foldable electronic device 100 is in the flattened state, the supporting door panels 142 may be used to support the flexible screen 150 , so as to provide stable support for the flexible screen 150 in the bending area, and ensure the flatness of the flexible screen 150 in the flattened state. The two supporting door panels 142 may be located on both sides of the width direction of the main inner shaft 1411 , respectively. When the foldable electronic device 100 is in the folded state, the two supporting door panels 142 and the main inner shaft 1411 together form a screen space 186 ( FIG18 ). For example, the supporting door panels 142 may be an integral structure, or the supporting door panels 142 may be formed by splicing multiple door panels.

[0083] Exemplarily, the support frame 143 and the corresponding support door panel 142 can be movably connected, and the support door panel 142 and the corresponding support frame 143 can be connected in a rotational manner, a sliding manner, or other connection methods with a degree of freedom. The embodiment of the present application is described by taking the rotational connection between the support door panel 142 and the corresponding support frame 143 as an example. An arc-shaped arm can be provided on one of the support door panel 142 and the support frame 143, and an arc-shaped groove can be provided on the other of the support door panel 142 and the support frame 143. The arc-shaped arm can be inserted into the arc-shaped groove and slide along the arc-shaped groove, so that the arc-shaped arm and the arc-shaped groove are rotationally matched, and then the support door panel 142 and the support frame 143 are rotationally connected through the cooperation of the arc-shaped arm and the arc-shaped groove.

[0084] Exemplarily, the support door panel 142 and the main shaft 141 can be movably connected, and the support door panel 142 and the main shaft 141 can be connected in a rotational manner, a sliding manner, or other connection methods with a degree of freedom. The embodiment of the present application is described by taking the sliding connection between the support door panel 142 and the main shaft 141 as an example. The support door panel 142 can be provided with a slide groove (for example, an arc-shaped slide groove), and the main shaft 141 can be provided with a pin, which is inserted into the slide groove and slides along the slide groove to achieve a sliding connection between the support door panel 142 and the main shaft 141. Alternatively, a pin can be provided on the swing member 145 and / or the linkage member 144, which is inserted into the slide groove and slides along the slide groove, so that the swing member 145 and / or the linkage member 144 can achieve a sliding connection with the support door panel 142 through the cooperation of the pin and the slide groove, thereby enabling the support door panel 142 to achieve a sliding connection relative to the main shaft 141.

[0085] For example, referring to FIG10 , the support door panel 142 may include a first support door panel 142 a and a second support door panel 142 b located on either side of the main shaft 141. The first support door panel 142 a may be located between the first support frame 143 a and the flexible screen 150 and rotatably connected to the first support frame 143 a. The second support door panel 142 b may be located between the second support frame 143 b and the flexible screen 150 and rotatably connected to the second support frame 143 b. Both the first support door panel 142 a and the second support door panel 142 b may be slidably connected to the main shaft 141.

[0086] In some embodiments, the foldable electronic device 100 may include multiple electronic components. The first middle frame 120a and the second middle frame 120b may each have a receiving cavity 121 (Figure 16), and multiple electronic components may be respectively accommodated in the receiving cavity 121 of the first middle frame 120a and the second middle frame 120b. Exemplarily, the electronic components may include but are not limited to a circuit board 192 (Figure 5), a battery 191 (Figure 5), a processor, a memory, a camera module, a sensor module, an audio module, a fingerprint module, a wireless communication module, a mobile communication module, a motor module, etc. Among them, the electronic component located in the receiving cavity 121 of the first middle frame 120a may be a first electronic component, and the electronic component located in the receiving cavity 121 of the second middle frame 120b may be a second electronic component.

[0087] The flexible circuit board 160 provided in the embodiment of the present application is described below.

[0088] In some embodiments, the foldable electronic device 100 may include an electrical connector that extends from the first middle frame 120a to the second middle frame 120b. The electrical connector can be used to electrically connect the first electronic component to the second electronic component to achieve electrical connection between electronic components in different middle frames 120. The number of electrical connectors can be one or more. For example, the electrical connector can include a flexible circuit board 160, a coaxial cable, etc. The embodiments of the present application are described using the flexible circuit board 160 as an example.

[0089] For example, the flexible circuit board 160 may have a certain degree of flexibility and bend as the two middle frames 120 rotate relative to each other. When the foldable electronic device 100 is in different states, such as flattened, folded, or in an intermediate state, the flexible circuit board 160 can rely on its own bending deformation to continue to maintain the electrical connection between the two adjacent middle frames 120. During the folding or unfolding process of the foldable electronic device 100, the distance between the ends of the flexible circuit board 160 will change along the direction from the first middle frame 120a to the second middle frame 120b. For example, when the foldable electronic device 100 is in the flattened state, the flexible circuit board 160 may reserve redundant length, thereby accommodating the spacing between the electronic components in the two middle frames 120 during the folding process of the foldable electronic device 100. Because the flexible circuit board 160 has redundant length, the flexible circuit board 160 will bend in the area between the two middle frames 120 to accommodate the flexible circuit board 160 between the two middle frames 120. 15 and 16 , when the foldable electronic device 100 is in a flattened state, the flexible circuit board 160 is in a bent state. Referring to FIG. 18 , when the foldable electronic device 100 is in a folded state, the flexible circuit board 160 is in an extended state.

[0090] For example, referring to Figures 7 and 10 , support brackets 143 can be located at both ends of the main shaft 141 in the direction of extension. Other rotatable components, such as support brackets 143, swinging members 145, and linkage members 144, can be omitted from the intermediate region between the ends of the main shaft 141. This prevents these other rotatable components from interfering with the flexible printed circuit board 160 during rotation, thereby facilitating the formation of a wiring space 184 within this intermediate region of the hinge assembly 140. By staggering these other rotatable components and wiring space 184 (Figure 16) along the direction of extension of the main shaft 141, wiring space 184 is increased, providing greater space for routing and deformation of the flexible printed circuit board 160. This increases the bending radius of the flexible printed circuit board 160 when bent, thereby reducing bending stress on the flexible printed circuit board 160. Wiring space 184 can be located in the intermediate region of the hinge assembly 140 in the direction of extension, or elsewhere within the hinge assembly 140, such as at one of the ends of the hinge assembly 140 in the direction of extension.

[0091] For example, referring to Figures 15 and 16, the wiring space 184 may include a first wiring space 1841, a second wiring space 1842, a third wiring space 1843, a fourth wiring space 1844 and a fifth wiring space 1845 which are arranged in sequence and interconnected along the direction from the first middle frame 120a to the second middle frame 120b. The first wiring space 1841 can be located between the first connecting member 130a and the first supporting door panel 142a, the second wiring space 1842 can be located between the main outer shaft 1412 and the first supporting door panel 142a, the third wiring space 1843 can be located between the main outer shaft 1412 and the main inner shaft 1411, the fourth wiring space 1844 can be located between the main outer shaft 1412 and the second supporting door panel 142b, and the fifth wiring space 1845 can be located between the second connecting member 130b and the second supporting door panel 142b. The flexible printed circuit board 160 can pass through the wiring space 184 of the hinge assembly 140 connected between the two middle frames 120 and extend into the accommodating cavity 121 of the two middle frames 120 through the wiring space 184 to achieve electrical connection with the first and second electronic components. A third wiring space 1843 is formed between the main outer shaft 1412 and the main inner shaft 1411, and vias 185 are formed on both sides of the main inner shaft 1411 and the main outer shaft 1412. The two vias 185 can include a first via 185a and a second via 185b. The first via 185a can connect the second wiring space 1842 with the third wiring space 1843, and the second via 185b can connect the fourth wiring space 1844 with the third wiring space 1843. 16 and 18 , both vias 185 can be located on the side of the main axis 141 close to the flexible screen 150, so that when the foldable electronic device 100 is in a folded state, the flexible circuit board 160 located in the third wiring space 1843 is arranged close to the main inner axis 1411, which is beneficial to shortening the total length of the flexible circuit board 160 when it is in an extended state, thereby reducing the redundant length of the flexible circuit board 160 when it is in a bent state, and increasing the bending radius of the flexible circuit board 160 when it is in a bent state, thereby reducing the bending stress of the flexible circuit board 160.

[0092] Referring to Figures 12a, 15, and 16, the outer surface of each middle frame 120 facing the main shaft 141 may have a mating surface 122, and a through hole 181 may be formed between the connector 130 and the corresponding mating surface 122. The through hole 181 communicates with the corresponding accommodating cavity 121. The mating surface 122 may include a first mating surface 122a and a second mating surface 122b located on either side of the main shaft 141. The first middle frame 120a has a first mating surface 122a on the side facing the main shaft 141, and the second middle frame 120b has a second mating surface 122b on the side facing the main shaft 141. The through hole 181 may include a first through hole 181a and a second through hole 181b located on either side of the main shaft 141. The first through hole 181a is formed between the first connector 130a and the first mating surface 122a, and the second through hole 181b is formed between the second connector 130b and the second mating surface 122b. First through-hole 181a connects the accommodating cavity 121 of the first middle frame 120a with the first wiring space 1841. One end of the flexible circuit board 160 enters the accommodating cavity 121 of the first middle frame 120a through the first wiring space 1841 and the first through-hole 181a. Second through-hole 181b connects the accommodating cavity 121 of the second middle frame 120b with the fifth wiring space 1845. The other end of the flexible circuit board 160 enters the accommodating cavity 121 of the second middle frame 120b through the fifth wiring space 1845 and the second through-hole 181b.

[0093] For example, referring to Figure 19, on the same side of the main shaft 141, the mating surface 122 may include a first mating end 1221 close to the flexible screen 150 and a second mating end 1222 away from the flexible screen 150. The first mating end 1221 is tilted toward the direction close to the main shaft 141, which can facilitate the installation of other structural parts on the mating surface 122, and is also beneficial to increase the thickness of the frame side wall of the middle frame 120 corresponding to the mating surface 122, thereby improving the structural strength of the frame side wall.

[0094] Referring to Figures 15 and 16, the flexible circuit board 160 may include two fixing portions 163 and a first extension section 161 located between the two fixing portions 163. The two fixing portions 163 may include a first fixing portion 1631 and a second fixing portion 1632. The first fixing portion 1631 is connected to the first middle frame 120a, and the second fixing portion 1632 is connected to the second middle frame 120b. By connecting the two fixing portions 163 to the first and second middle frames 120a, 120b, respectively, the flexible circuit board 160 and the connected electronic components can be prevented from pulling during the folding process of the foldable electronic device 100, thereby preventing the connection stability between the flexible circuit board 160 and the electronic components. The first extension section 161 is not connected to other structural components and is in a movable state. The first extension section 161 can be inserted into the wiring space 184. During the relative rotation of the first and second middle frames 120a, 120b, the first extension section 161 can bend and deform within the wiring space 184. When the foldable electronic device 100 is in a flattened state, the first extension section 161 has a redundant length. In this case, the distance between the two fixing portions 163 along the direction from the middle frame 120 to the main axis 141 is less than the extended length of the first extension section 161. The flexible circuit board 160 may include two second extension sections 162. One second extension section 162 may be located on the side of each fixing portion 163 away from the first extension section 161. One second extension section 162 may be located on the side of the first fixing portion 1631 away from the first extension section 161 and enter the accommodating cavity 121 of the first middle frame 120a through the first through hole 181a. The other second extension section 162 may be located on the side of the second fixing portion 1632 away from the first extension section 161 and enter the accommodating cavity 121 of the second middle frame 120b through the second through hole 181b.

[0095] In some embodiments, referring to Figures 11, 12a, and 13b, a mounting member 171 may be connected to each middle frame 120, and a fixing portion 163 is connected to a corresponding middle frame 120 via a mounting member 171. The mounting member 171 may be directly connected to the middle frame 120, or the mounting member 171 may be indirectly connected to the middle frame 120 via other structural members (e.g., a connector 130). The mounting member 171 may include a first mounting member 171a and a second mounting member 171b located on both sides of the main shaft 141. The first mounting member 171a may be connected to the first connector 130a and connected to the first middle frame 120a via the first connector 130a. The second mounting member 171b may be connected to the second connector 130b and connected to the second middle frame 120b via the second connector 130b. For example, the mounting member 171 may be located between the middle frame 120 and the main shaft 141.

[0096] Referring to FIG. 17 , the mounting member 171 may include a first end 1711 and a second end 1712 on the same side of the main axis 141. The first end 1711 and the second end 1712 may be opposite ends of the mounting member 171. When the foldable electronic device 100 is in a flattened state, along the thickness direction of the flexible screen 150, the distance between the first end 1711 and the flexible screen 150 may be less than or equal to the distance between the second end 1712 and the flexible screen 150. Along a direction parallel to the flexible screen 150, the distance between the first end 1711 and the main axis 141 may be greater than the distance between the second end 1712 and the main axis 141. Alternatively, the direction from the first end 1711 to the second end 1712 may be perpendicular to the flexible screen 150. The direction from the first end 1711 to the second end 1712 of the first mounting member 171a is defined as direction F1, and the direction from the first middle frame 120a to the main axis 141 is defined as direction F2. The angle α between directions F1 and F2 may range from 0° to 90°. The direction from the first end 1711 to the second end 1712 of the second mounting member 171b is direction F3, and the direction from the second middle frame 120b to the main axis 141 is direction F4. The angle α between directions F3 and F4 can range from 0° to 90°. For example, the angle α can be 0°, 10°, 30°, 45°, 60°, 75°, 90°, or any value between 0° and 90°.

[0097] The following describes the various bending sections of the flexible circuit board 160 in the embodiment of the present application when it is in a bent state.

[0098] Referring to FIG. 17 , a mounting member 171 is provided to secure the flexible circuit board 160. The mounting member 171 may include a first end 1711 and a second end 1712. When the foldable electronic device 100 is in a flattened state, along the thickness direction of the flexible screen 150, the distance between the first end 1711 and the flexible screen 150 may be less than or equal to the distance between the second end 1712 and the flexible screen 150. Along a direction parallel to the flexible screen 150, the distance between the first end 1711 and the main axis 141 may be greater than the distance between the second end 1712 and the main axis 141. Alternatively, the direction from the first end 1711 to the second end 1712 may be perpendicular to the flexible screen 150. Figure 17 shows that along the thickness direction of the flexible screen 150, the distance between the first end 1711 and the flexible screen 150 is smaller than the distance between the second end 1712 and the flexible screen 150. In a direction parallel to the flexible screen 150, the distance between the first end 1711 and the main axis 141 is greater than the distance between the second end 1712 and the main axis 141. In an embodiment where the distance between the first end 1711 and the flexible screen 150 is equal to the distance between the second end 1712 and the flexible screen 150 (not shown in Figure 17), the mounting member 171 can be parallel to the flexible screen 150, and the direction from the first end 1711 to the second end 1712 is parallel to the direction from the first middle frame 120a to the second middle frame 120b. In an embodiment where the direction from the first end 1711 to the second end 1712 is perpendicular to the flexible screen 150 (not shown in Figure 17), the thickness direction of the mounting member 171 is parallel to the direction from the first middle frame 120a to the second middle frame 120b. With such an arrangement, referring to Figures 16 and 17, when the flexible circuit board 160 is fixed on the mounting member 171, part of the second extension section 162 and the fixing portion 163 between the middle frame 120 and the second end of the mounting member 171 can be formed into a fourth curved section 160d, and the fourth curved section 160d can be fixed by the mounting member 171, so that the fourth curved section 160d is in a fixed state that cannot be deformed, thereby reducing the number of active curved sections between the two middle frames 120, so that the total number of active curved sections of the first extension section 161 between the two middle frames 120 is small, thereby improving the controllability of the curved shape of each curved section of the active first extension section 161 during the folding or unfolding process of the foldable electronic device 100, and thus there is no need to fix the first extension section 161 to the hinge assembly 140. In addition, since only the two fixing portions 163 of the flexible circuit board 160 are connected to the two mounting members 171 respectively, and the first extension section 161 of the flexible circuit board 160 is not connected to other structural members, there is no need to set up a connecting structure for connection, and the two mounting members 171 are far apart in a direction parallel to the flexible screen 150, so that the space for the first extension section 161 to move in the foldable electronic device 100 is larger, the shape of each curved section of the first extension section 161 is more stretched, and the bending angle is larger, so that the bending stress on the first extension section 161 is smaller, thereby reducing the probability of damage to the first extension section 161.

[0099] In some embodiments, referring to FIG. 15 and FIG. 16 , the main outer shaft 1412 may include two first main outer shaft portions 1412a and a second main outer shaft portion 1412b located between the two first main outer shaft portions 1412a. The two first main outer shaft portions 1412a may be located on a side of the second main outer shaft portion 1412b closer to the flexible screen 150, and the first main outer shaft portion 1412a extends toward the flexible screen 150. The main outer shaft 1412 may be bent away from the flexible screen 150, such that the first extension section 161 located in the third wiring space 1843 may form a second curved section 160b, which may bend away from the flexible screen 150. At least a portion of the second curved section 160b may correspond to the second main outer shaft portion 1412b. One end of the first main outer shaft portion 1412a is connected to the second main outer shaft portion 1412b, and the other end of the first main outer shaft portion 1412a extends toward the direction close to the flexible screen 150, and the other ends of the two first main outer shaft portions 1412a are spaced apart from both sides of the width direction of the main inner shaft 1411, thereby forming two through holes 185 on the side of the main shaft 141 close to the flexible screen 150. In addition, the other ends of the two first main outer shaft portions 1412a are spaced apart from the first supporting door panel 142a and the second supporting door panel 142b respectively to form a second wiring space 1842 and a fourth wiring space 1844. The second wiring space 1842 and the fourth wiring space 1844 are both positioned near the flexible screen 150, such that the first extension section 161 forms a first curved section 160a at the first via 185a and the second wiring space 1842. The first extension section 161 also forms a first curved section 160a at the second via 185b and the fourth wiring space 1844. The first curved section 160a may correspond one-to-one with the first main outer axis 1412a, and the two first curved sections 160a may be located on either side of the second curved section 160b, with the first curved section 160a curving toward the flexible screen 150. The first extension section 161 forms a third curved section 160c at a position corresponding to the second end 1712 of the mounting member 171. The third curved section 160c corresponds one-to-one with the second end 1712 of the mounting member 171 and curves away from the flexible screen 150. A third curved section 160c may be located on a side of a first curved section 160a away from the second curved section 160b. Equivalently, the first extension section 161 may include a third curved section 160c, a first curved section 160a, a second curved section 160b, a first curved section 160a, and a third curved section 160c connected in sequence.

[0100] Among them, the first main outer shaft portion 1412a can help form the first curved segment 160a, the second main outer shaft portion 1412b can help form the second curved segment 160b, and the mounting member 171 can help form the third curved segment 160c. Through the cooperation of the main shaft 141 and the mounting member 171, the bending shape of each curved segment of the first extension segment 161 in a free state is relatively stable, so that the bending shape of each curved segment of the first extension segment 161 can be better controlled.

[0101] In some embodiments, as shown in Figures 7 and 15 , the main axis 141 corresponding to the first extension segment 161 may have a centerline DD extending along the extension direction of the main axis 141. Line BB in Figure 15 passes through the centerline DD and is perpendicular to the flexible screen 150. The first mounting member 171a and the second mounting member 171b may be symmetrically arranged on either side of the centerline DD. During the folding or unfolding of the foldable electronic device 100, the first mounting member 171a and the second mounting member 171b exert relatively consistent forces on the first extension segment 161, thereby improving the consistency of the bending deformation of the first extension segment 161 on either side of the centerline DD. This, in turn, ensures that the bending deformation of the first extension segment 161 on either side of the centerline DD is relatively consistent, facilitating control of the bending shape of the first extension segment 161 and reducing deviation of the first extension segment 161 relative to a predetermined area. The predetermined area refers to the pre-designed active area of ​​the first extension segment 161.

[0102] For example, referring to Figures 7 and 15, the main inner axis 1411 and the main outer axis 1412 corresponding to the first extension section 161 can be symmetrically arranged along the center line DD, so that the first via 185a and the second via 185b can be symmetrically arranged on both sides of the center line DD. During the folding or unfolding process of the foldable electronic device 100, the main inner axis 1411 and the main outer axis 1412 exert relatively consistent forces on the first extension section 161 located on both sides of the center line DD, which helps to improve the consistency of the bending deformation of the first extension section 161 located on both sides of the center line DD, thereby making the bending deformation generated by the first extension section 161 located on both sides of the center line DD relatively consistent, which helps to control the bending shape of the first extension section 161 and reduce the offset of the first extension section 161 relative to the preset area.

[0103] For example, referring to Figures 7 and 15, the first supporting door panel 142a and the second supporting door panel 142b corresponding to the first extension section 161 can be symmetrically arranged on both sides of the center line DD, so that the second wiring space 1842 and the fourth wiring space 1844 can be symmetrically arranged on both sides of the center line DD. During the folding or unfolding process of the foldable electronic device 100, the first supporting door panel 142a and the second supporting door panel 142b exert relatively consistent forces on the first extension section 161 located on both sides of the center line DD, which helps to improve the consistency of the bending deformation of the first extension section 161 located on both sides of the center line DD, thereby making the bending deformation generated by the first extension section 161 located on both sides of the center line DD relatively consistent, which helps to control the bending shape of the first extension section 161 and reduce the offset of the first extension section 161 relative to the preset area.

[0104] For example, referring to Figures 15 and 16, the main outer shaft 1412 may include a shaft body 1412c and a protective member 1412d. The protective member 1412d may be located on the side of the shaft body 1412c facing the flexible screen 150. The protective member 1412d may cover at least the shaft bodies 1412c of the two first main outer shaft portions 1412a. The protective member 1412d may prevent the end of the shaft body 1412c of the first main outer shaft portion 1412a close to the flexible screen 150 from contacting the first extension section 161, thereby preventing the first extension section 161 from being damaged by the end of the shaft body 1412c of the first main outer shaft portion 1412a. The surface of the protective member 1412d away from the shaft 1412c can be curved, thereby increasing the contact area between the protective member 1412d and the first extension section 161, which helps reduce the force exerted by the protective member 1412d on the first extension section 161. In addition, it helps increase the bending radius of the first curved section 160a, thereby reducing the bending stress of the first curved section 160a. For example, the protective member 1412d can be symmetrically arranged along the center line DD (Figure 7).

[0105] In the related art, referring to FIG. 1 , the first movable segment 14a has an asymmetric structure, and the multiple curved segments formed by the first movable segment 14a are arranged asymmetrically. This results in a low controllability of the bending deformation and offset relative to the preset area generated at various locations on the first movable segment 14a in the active state during the folding or unfolding process of the foldable electronic device, resulting in an unstable bending shape and offset relative to the preset area of ​​each curved segment of the first movable segment 14a. During the folding or unfolding process, the first movable segment 14a cannot move within the preset area, and the deformation of the first movable segment 14a and the offset relative to the preset area vary. When the deformation and / or offset of the first movable segment 14a relative to the preset area are large, the first movable segment 14a will exert a large force on the door panel 15, which can easily cause creases and shadows on the flexible display screen 13, affecting the display effect of the flexible screen. In addition, the first movable segment 14a will exert a large force on the main shaft structure 12, which can easily cause severe friction or scratches between the main shaft structure 12, and can easily cause the first movable segment 14a to be worn and broken. The second movable section 14b is similar to the first movable section 14a and will not be described in detail.

[0106] 7 and 15 , the embodiment of the present application symmetrically arranges two mounting members 171, two support door panels 142, a main inner shaft 1411, and a main outer shaft 1412 on either side of a centerline DD. This allows the first extension section 161 in its active state to be substantially symmetrical along the centerline DD. During the folding or unfolding process of the foldable electronic device 100, the substantially symmetrical state of the first extension section 161 along the centerline DD allows for greater controllability of the bending deformation and offset relative to a predetermined region at various locations on the first extension section 161 in its active state, resulting in a more stable bending configuration and offset relative to a predetermined region for each curved section of the first extension section 161. During the relative rotation of the first middle frame 120a and the second middle frame 120b, when the first extension section 161 bends and deforms, it can move within the preset area, so that the offset of each part of the first extension section 161 relative to the preset area can be controlled to be smaller, and the force of each bending section of the first extension section 161 on the supporting door panel 142 and the main outer shaft 1412 can be controlled to be smaller, so that the deformation of the supporting door panel 142 is smaller, so as to alleviate the crease light and shadow of the flexible screen 150, thereby improving the display effect of the flexible screen 150. In addition, the force of the main outer shaft 1412 reacting on the first extension section 161 can also be smaller, thereby alleviating the friction or scratching of the main outer shaft 1412 on the first extension section 161, and alleviating the wear and breakage of the first extension section 161.

[0107] For example, referring to Figures 7 and 17, the first extension segment 161 located on one side of the center line DD may include multiple first sub-extension segments 1611, and the first extension segment 161 located on the other side of the center line DD may include multiple second sub-extension segments 1612. The first sub-extension segments 1611 and the second sub-extension segments 1612 may correspond to each other. In the direction parallel to the flexible screen 150, the distance between the first sub-extension segment 1611 and the center line DD (that is, the distance x1 between the first sub-extension segment 1611 and the line BB) is equal to the distance between the corresponding second sub-extension segment 1612 and the center line DD (that is, the distance x2 between the second sub-extension segment 1612 and the line BB). In the thickness direction of the flexible screen 150, the ratio of the distance z1 between the first sub-extension segment 1611 and the flexible screen 150 to the distance z2 between the corresponding second sub-extension segment 1612 and the flexible screen 150 may be in the range of 0.5-1. 2, thereby making the distances z1 and z2 between the first sub-extension segment 1611 and the corresponding second sub-extension segment 1612 and the flexible screen 150 relatively close. This allows the portion of the first extension segment 161 composed of multiple first sub-extension segments 1611 and the other portion of the first extension segment 161 composed of multiple second sub-extension segments 1612 to be roughly symmetrical on both sides of the centerline DD. This can alleviate the crease and shadow of the flexible screen 150, improve the display quality of the flexible screen 150, and reduce wear and fracture of the first curved segment 160a. For example, along the thickness direction of the flexible screen 150, the ratio (z1 / z2) of the distance z2 between the first sub-extension segment 1611 and the flexible screen 150 to the distance z2 between the corresponding second sub-extension segment 1612 and the flexible screen 150 can be 0.5, 0.8, 1, 1.2, 1.5, 1.8, 2, or any value between 0.5 and 2. When the distance z1 between the first sub-extension segment 1611 and the flexible screen 150 is equal to the distance z2 between the corresponding second sub-extension segment 1612 and the flexible screen 150, the ratio of z1 / z2 is 1, and the first extension segment 161 is symmetrically arranged along the center line DD, which can better alleviate the crease light and shadow of the flexible screen 150, improve the display effect of the flexible screen 150, and better alleviate the wear and breakage of the first curved segment 160a.

[0108] For example, referring to Figures 16 and 17, the second curved segment 160b may include a top portion G. Along the thickness direction of the flexible screen 150, the distance between the top portion G and the flexible screen 150 may be greater than the distance between the rest of the second curved segment 160b and the flexible screen 150. Furthermore, along the direction from the middle frame 120 to the main axis 141, the ratio of the distance between the top portion G and the centerline DD (i.e., the distance between the top portion G and line BB in Figure 17) to the width of the main axis 141 may be less than or equal to 0.5. With this configuration, the offset between the top portion of the second curved segment 160b and the centerline DD is small. For example, the first extension segment 161 between the top and the first fixing portion 1631 and the first extension segment 161 between the top and the second fixing portion 1632 can be arranged roughly symmetrically. Since the offset between the top of the second curved segment 160b and the centerline DD is small, it can be arranged roughly symmetrically along the centerline DD, similar to the first extension segment 161. This can alleviate the crease and shadow of the flexible screen 150, improve the display quality of the flexible screen 150, and reduce wear and fracture of the first curved segment 160a. For example, along the direction from the middle frame 120 to the main axis 141, the ratio of the distance between the top G and the centerline DD to the width of the main axis 141 can be 0, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, or any value less than 0.5.

[0109] For example, referring to Figures 19 and 20, in the same mounting member 171, the second end 1712 of the mounting member 171 may include a first mounting portion 1712a, a curved portion 1712c, and a second mounting portion 1712b, which are connected in sequence. The first mounting portion 1712a may be connected to the first end 1711 of the mounting member 171, and the second mounting portion 1712b may be located to one side of the first mounting portion 1712a in the thickness direction. In other words, the mounting member 171 may include a first end 1711, a first mounting portion 1712a, a curved portion 1712c, and a second mounting portion 1712b, which are connected in sequence. Since the mounting member 171 is provided with the second mounting portion 1712b, the thickness of the second end 1712 of the mounting member 171 is larger, which can improve the structural strength of the mounting member 171. As shown in FIG19 , the second mounting portion 1712b can be located on the side of the first mounting portion 1712a away from the fixing portion 163. Alternatively, as shown in FIG20 , the second mounting portion 1712b can be located on the side of the first mounting portion 1712a closer to the fixing portion 163. The provision of the curved portion 1712c prevents the sharp second end 1712 of the mounting member 171 from cutting and damaging the first extension section 161, thereby protecting the first extension section 161. For example, the surface of the curved portion 1712c near the first extension section 161 can be a curved surface, thereby ensuring a more uniform force applied by the curved portion 1712c to the first extension section 161 and preventing stress concentration on the first extension section 161 caused by the curved portion 1712c, which could damage the first extension section 161. Of course, in other examples, as shown in FIG21 , the second end 1712 of the mounting member 171 can be provided without the curved portion 1712c and the second mounting portion 1712b, thereby simplifying the structure of the mounting member 171.

[0110] In some embodiments, referring to Figures 12a, 13a, and 15, a clamping member 172 may be connected to each middle frame 120. The clamping member 172 may be located between the middle frame 120 and the main shaft 141 on the same side of the centerline DD (Figure 7) (i.e., the same side of the centerline BB in Figure 15). The mounting member 171 may be located on the side of the fixing portion 163 closer to the flexible screen 150, and the clamping member 172 may be located on the side of the fixing portion 163 farther from the flexible screen 150. The mounting member 171 and the clamping member 172 sandwich the fixing portion 163 therebetween. For example, the clamping member 172 may include a first clamping member 172a and a second clamping member 172b located on either side of the main shaft 141. The first fixing portion 1631 is fixed between the first clamping member 172a and the first mounting member 171a, and the second fixing portion 1632 is fixed between the second clamping member 172b and the second mounting member 171b. On the same side of the centerline DD ( FIG. 7 ), the fixing portion 163 is connected to the middle frame 120 via a clamping member 172 and a mounting member 171, thereby improving the connection stability between the fixing portion 163 and the corresponding middle frame 120. At least one of the mounting member 171 and the clamping member 172 can be connected to the corresponding connecting member 130 by bonding, welding, clamping, threading, or the like, thereby achieving connection to the middle frame 120.

[0111] For example, referring to Figures 12b, 15, and 16, on the same side of the centerline DD (Figure 7), the clamping member 172 may cover a portion of the through-hole 181, a gap 182 may be defined between the clamping member 172 and the mating surface 122, and the second extension section 162 passes through the gap 182 and extends into the accommodating cavity 121. For example, the first clamping member 172a may cover the first through-hole 181a, forming a first gap 182a between the first mating surface 122a and the first clamping member 172a. The second clamping member 172b may cover the second through-hole 181b, forming a second gap 182b between the second mating surface 122b and the second clamping member 172b. The two second extension sections 162 are respectively disposed in the first gap 182a and the second gap 182b.

[0112] For example, referring to FIG. 21 , a reinforcement member 173 may be provided between the mounting member 171 and the corresponding clamping member 172 on the same side of the centerline DD ( FIG. 7 ). The reinforcement member 173 may be located on at least one side of the fixing portion 163 in the thickness direction. The provision of the reinforcement member 173 enhances the structural strength of the fixing portion 163, thereby protecting the fixing portion 163 and reducing the difficulty of installing the fixing portion 163. The reinforcement member 173 may be located between the mounting member 171 and the fixing portion 163, and / or between the clamping member 172 and the fixing portion 163. On the same side of the centerline DD ( FIG. 7 ), for example, with the reinforcement member 173 located between the mounting member 171 and the fixing portion 163, adhesives 188 may be provided between the reinforcement member 173 and the mounting member 171, between the reinforcement member 173 and the fixing portion 163, and between the fixing portion 163 and the clamping member 172, thereby reducing assembly difficulty. The reinforcing piece 173 may be located on at least one of the first fixing portion 1631 and the second fixing portion 1632 .

[0113] In some embodiments, as shown in Figures 12c, 14, and 21, each mounting member 171 may be provided with an auxiliary mounting member 174 at its first end 1711. The auxiliary mounting member 174 may be located between the second extension 162 and the mating surface 122 on the same side of the centerline DD (Figure 7), and a portion of the clamping member 172 may be located on the side of the second extension 162 away from the auxiliary mounting member 174. For example, as shown in Figures 15 and 19, the auxiliary mounting members 174 may include a first auxiliary mounting member 174a and a second auxiliary mounting member 174b located on either side of the spindle 141. The first auxiliary mounting member 174a may be located between the first mating surface 122a and one of the second extensions 162, and the second auxiliary mounting member 174b may be located between the second mating surface 122b and the other second extension 162. Since the first mating end 1221 of the mating surface 122 is tilted toward the spindle 141, installation between the mating surface 122 and the corresponding auxiliary mounting member 174 may be facilitated. The extension direction of the auxiliary mounting part 174 can be the same as the extension direction of the mating surface 122. At this time, the extension directions of the auxiliary mounting part 174 and the corresponding mounting part 171 are different (for example, the integral structural part formed by the auxiliary mounting part 174 and the corresponding mounting part 171 can be "V"-shaped).

[0114] Exemplarily, the end of the first auxiliary mounting member 174a away from the first mounting member 171a and / or the end of the second auxiliary mounting member 174b away from the second mounting member 171b can be bent toward the direction close to the corresponding second extension section 162, so as to avoid the end of the auxiliary mounting member 174 away from the corresponding mounting member 171 being sharper and cutting and damaging the second extension section 162, thereby protecting the second extension section 162.

[0115] In some embodiments, referring to Figures 15 and 18, the first connecting member 130a can rotate relative to the main shaft 141 under the drive of the first middle frame 120a, and a gap E can be provided between the first connecting member 130a and the main shaft 141. The second connecting member 130b can rotate relative to the main shaft 141 under the drive of the second middle frame 120b, and a gap E can also be provided between the second connecting member 130b and the main shaft 141. External water and dust can easily enter the wiring space 184 through the gap E between the connecting member 130 and the main shaft 141, and then enter the accommodating cavity 121 of the first middle frame 120a through the first gap 182a between the first clamping member 172a and the first mating surface 122a, and enter the accommodating cavity 121 of the second middle frame 120b through the second gap 182b between the second clamping member 172b and the second mating surface 122b, thereby causing failure of the electronic components in the accommodating cavity 121.

[0116] For example, referring to FIG. 21 , a seal 183 may be provided between the clamping member 172 and the corresponding mating surface 122 on the same side of the centerline DD ( FIG. 7 ). A seal 183 may be provided between at least one of the auxiliary mounting member 174 and the corresponding mating surface 122, between the auxiliary mounting member 174 and the corresponding second extension 162, and between the clamping member 172 and the corresponding second extension 162. This helps prevent external water and dust from entering the corresponding accommodating cavity 121 of the middle frame 120a through the gap 182 between the clamping member 172 and the corresponding mating surface 122, thereby improving the waterproof and dustproof properties of the foldable electronic device 100 and enhancing its operational stability. A seal 183 may be provided between at least one of the first clamping member 172a and the first mating surface 122a, and between the second clamping member 172b and the second mating surface 122b. For example, the seal 183 can be formed of an adhesive material, thereby simplifying the assembly process of the seal 183. In addition, the hardness of the seal 183 can be lower than the hardness of the auxiliary mounting member 174 and / or the clamping member 172, thereby facilitating a close fit between the seal 183 and other structural members attached to the seal 183, thereby improving the waterproof and dustproof properties of the foldable electronic device 100.

[0117] During the process of assembling the clamping member 172 and the corresponding mounting member 171, on the same side of the main shaft 141, the auxiliary mounting member 174 can be first bonded to the mating surface 122 through the sealing member 183 (for example, the sealing member 183 can be formed by an adhesive material), and the sealing member 183 is set between the auxiliary mounting member 174 and the flexible circuit board 160, and between the flexible circuit board 160 and the clamping member 172, and the sealing member 183 is squeezed by the clamping member 172 to clamp the flexible circuit board 160, thereby effectively achieving waterproofing, dustproofing, etc. In addition, the mounting member 171 is located at one end of the auxiliary mounting member 174. The side of the fixing portion 163 facing the flexible screen 150 is connected to the reinforcing member 173 via an adhesive 188. The reinforcing member 173 is then bonded to the mounting member 171 via the adhesive 188. The adhesive 188 is disposed between the clamping member 172 and the fixing portion 163. The clamping member 172 compresses the adhesive 188 to effectively secure the fixing portion 163. For example, both ends of the clamping member 172 in the extension direction can be secured to the connecting member 130 via fasteners 194, and both ends of the mounting member 171 in the extension direction can be secured to the connecting member 130 via fasteners 194. The same end of the clamping member 172 and the corresponding mounting member 171 can be secured to the connecting member 130 via the same fastener 194, thereby simplifying the assembly process of the clamping member 172 and the corresponding mounting member 171. For example, the fastener 194 can include a screw.

[0118] In some embodiments, as shown in Figures 16 and 17 , a relief groove 187 may be provided on the side of the support door panel 142 facing away from the flexible screen 150. The relief groove 187 may be provided at an end of the support door panel 142 proximate to the corresponding first curved segment 160a, thereby creating a relief space for the first curved segment 160a, allowing the first curved segment 160a to be formed in a more relaxed shape, thereby reducing forces acting on the first curved segment 160a and protecting the first curved segment 160a. Furthermore, / or, a relief groove 187 may be provided on the side of at least one of the clamping member 172 and the connecting member 130 facing the flexible screen 150. The relief groove 187 may be provided proximate to the third curved segment 160c, thereby creating a relief space for the third curved segment 160c, allowing the third curved segment 160c to be formed in a more relaxed shape, thereby reducing forces acting on the third curved segment 160c and protecting the third curved segment 160c.

[0119] In the description of the embodiments of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on specific circumstances.

[0120] The terms "first," "second," "third," "fourth," etc., if any, are used to distinguish between similar objects and not necessarily to describe a particular sequential or chronological order.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application have been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A foldable electronic device, characterized in that: include: Two middle frames (120), a rotating shaft assembly (140), a flexible circuit board (160) and a flexible screen (150), wherein the two middle frames (120) are rotatably connected to two sides of the rotating shaft assembly (140), and the flexible screen (150) is laid on the same side of the two middle frames (120) and the rotating shaft assembly (140) in a thickness direction; The rotating shaft assembly (140) comprises a main shaft (141), the flexible circuit board (160) comprises two fixing parts (163) and a first extension section (161) located between the two fixing parts (163), and the first extension section (161) is inserted into the main shaft (141); Each of the middle frames (120) is connected to a mounting member (171), the fixing portion (163) is connected to the mounting member (171), and the mounting member (171) includes a first end (1711) and a second end (1712). When the foldable electronic device (100) is in a flattened state, along the thickness direction of the flexible screen (150), the distance between the first end (1711) and the flexible screen (150) is less than or equal to the distance between the second end (1712) and the flexible screen (150), along the direction parallel to the flexible screen (150), the distance between the first end (1711) and the main axis (141) is greater than the distance between the second end (1712) and the main axis (141), or the direction from the first end (1711) to the second end (1712) is perpendicular to the flexible screen (150).

2. The foldable electronic device according to claim 1, characterized in that: The main axis (141) corresponding to the first extension section (161) has a center line, and the center line extends along the extension direction of the main axis (141). The mounting parts (171) of the two middle frames (120) are symmetrically arranged on both sides of the center line.

3. The foldable electronic device according to claim 2, characterized in that: The rotating shaft assembly (140) comprises two supporting door plates (142); the main shaft (141) comprises a main inner shaft (1411) and a main outer shaft (1412) connected to each other; the main outer shaft (1412) is located on a side of the main inner shaft (1411) away from the flexible screen (150); the two supporting door plates (142) are movably connected to the main shaft (141); the two supporting door plates (142) are respectively located on two sides of the main inner shaft (1411) and are spaced apart from the main outer shaft (1412) along the thickness direction of the flexible screen (150); The first extension section (161) is disposed between the main inner shaft (1411) and the main outer shaft (1412), and between the main outer shaft (1412) and the supporting door panel (142); The main inner shaft (1411), the main outer shaft (1412) and the two supporting door panels (142) corresponding to the first extension section (161) are all symmetrically arranged along the center line.

4. The foldable electronic device according to claim 2 or 3, characterized in that: The first extension segment (161) located on one side of the center line includes a plurality of first sub-extension segments (1611), and the first extension segment (161) located on the other side of the center line includes a plurality of second sub-extension segments (1612); The first sub-extension segment (1611) and the second sub-extension segment (1612) correspond one to one. Along a direction parallel to the flexible screen (150), the distance between the first sub-extension segment (1611) and the center line is equal to the distance between the corresponding second sub-extension segment (1612) and the center line. Along the thickness direction of the flexible screen (150), the ratio of the distance between the first sub-extension segment (1611) and the flexible screen (150) to the distance between the corresponding second sub-extension segment (1612) and the flexible screen (150) is in a range of 0.5-2.

5. The foldable electronic device according to claim 4, characterized in that: The first extension section (161) is symmetrically arranged along the center line.

6. The foldable electronic device according to claim 3, characterized in that: The main outer shaft (1412) comprises two first main outer shaft portions (1412a) and a second main outer shaft portion (1412b) located between the two first main outer shaft portions (1412a), the two first main outer shaft portions (1412a) being located on a side of the second main outer shaft portion (1412b) close to the flexible screen (150) and extending in a direction close to the flexible screen (150); The first extension section (161) includes two first bending sections (160a) and a second bending section (160b) located between the two first bending sections (160a), the first bending sections (160a) corresponding one-to-one with the first main outer axis portion (1412a) and bending in a direction approaching the flexible screen (150), and the second bending section (160b) corresponding to the second main outer axis portion (1412b) and bending in a direction away from the flexible screen (150).

7. The foldable electronic device according to claim 6, characterized in that: The first extension section (161) comprises two third curved sections (160c), one of the third curved sections (160c) being located on a side of one of the first curved sections (160a) away from the second curved section (160b); The third curved section (160c) corresponds one-to-one to the second end (1712) of the mounting member (171), and the third curved section (160c) is bent in a direction away from the flexible screen (150).

8. The foldable electronic device according to any one of claims 1 to 3, characterized in that: In the same mounting member (171), the second end (1712) includes a first mounting portion (1712a), a bending portion (1712c) and a second mounting portion (1712b) which are connected in sequence, the first mounting portion (1712a) is connected to the first end (1711), and the second mounting portion (1712b) is located on one side of the first mounting portion (1712a) in the thickness direction.

9. The foldable electronic device according to claim 8, characterized in that: The surface of the bent portion (1712c) close to the flexible circuit board (160) is a curved surface.

10. The foldable electronic device according to any one of claims 1 to 3, characterized in that: Each of the middle frames (120) is connected to a clamping member (172). On the same side of the main shaft (141), the mounting member (171) is located on a side of the fixing portion (163) close to the flexible screen (150), and the clamping member (172) is located on a side of the fixing portion (163) away from the flexible screen (150).

11. The foldable electronic device according to claim 10, characterized in that: The flexible circuit board (160) comprises two second extension sections (162), one of the second extension sections (162) is located on a side of the fixing portion (163) away from the first extension section (161), each of the middle frames (120) has a receiving cavity (121), and each of the middle frames (120) is provided with a connecting member (130) on a side close to the main shaft (141), and the connecting member (130) is located on a side of the rotating shaft assembly (140) away from the flexible screen (150); On the same side of the main shaft (141), the outer surface of the middle frame (120) facing the main shaft (141) has a mating surface (122), a through hole (181) is provided between the connecting member (130) and the mating surface (122), the through hole (181) is communicated with the accommodating cavity (121), the clamping member (172) covers a portion of the through hole (181) and has a gap (182) between the clamping member (172) and the mating surface (122), and the second extension section (162) passes through the gap (182) and extends into the accommodating cavity (121).

12. The foldable electronic device according to claim 11, characterized in that: The mating surface (122) comprises a first mating end (1221) close to the flexible screen (150) and a second mating end (1222) away from the flexible screen (150), and the first mating end (1221) is inclined in a direction close to the main axis (141).

13. The foldable electronic device according to claim 11, characterized in that: The first end (1711) of each mounting member (171) is provided with an auxiliary mounting member (174); on the same side of the main shaft (141), the auxiliary mounting member (174) is located between the second extension section (162) and the mating surface (122); and part of the clamping member (172) is located on the side of the second extension section (162) away from the flexible screen (150); and a sealing member (183) is provided between at least one of the auxiliary mounting member (174) and the mating surface (122), between the auxiliary mounting member (174) and the second extension section (162), and between the clamping member (172) and the second extension section (162).

14. The foldable electronic device according to any one of claims 1 to 3, characterized in that: It also includes a reinforcing piece (173), wherein the reinforcing piece (173) is located on at least one side in the thickness direction of the fixing portion (163).

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