Flexible circuit board assembly and electronic device

Abstract

The application provides a flexible circuit board assembly and an electronic device, which comprises a flexible circuit board and a control structure. The control structure comprises a transmission member and two winding shafts, the two winding shafts are arranged on the transmission member at intervals, the flexible circuit board passes between the two winding shafts along an extension direction, the transmission member drives the two winding shafts to rotate, and the flexible circuit board is wound on the outer circumferential side of the two winding shafts as a whole. Alternatively, the control structure comprises a transmission member, a guide shaft and a connecting member, the guide shaft is located on one side of the flexible circuit board, one end of the connecting member is arranged on the transmission member, and the other end is connected with the guide shaft, the transmission member drives the connecting member to drive the guide shaft to move, and the guide shaft drives the flexible circuit board to bend. The transmission member of the control structure drives the winding shaft or the guide shaft to move, provides bending guidance for the flexible circuit board, makes the redundant length of the flexible circuit board bend to form a winding shape or an arc-shaped arc shape, avoids stress concentration, and improves the service life of the flexible circuit board.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of flexible circuit board, and particularly relate to a flexible circuit board assembly and an electronic device comprising the same. BACKGROUND

[0002] When there is a structure that needs to fold, slide, stretch and the like in a device, because the flexible circuit board (FPC) has the characteristic of easy bending, the FPC is usually used to realize electrical connection between the moving structure and the fixed structure, such as a printed circuit board (PCB). In the process of the structure moving, the distance between the fixed structure changes, which causes the length of the FPC to appear redundant, and the form consistency of the redundant free section of the FPC is poor, which is easy to be pressed and folded. For example, as shown in FIG. 1, in a mobile phone 600, a camera assembly 601 stretches to drive one end of an FPC 603 to move, the FPC 603 is in a straight state when the camera assembly 601 is stretched out, and the FPC 603 has a redundant length when the camera assembly 601 is retracted, and the redundant length of the FPC 603 is in a free state, which is easy to appear the folding problem as shown in FIG. 2. Figure 1A As another example, as shown in FIG. 3, in a folding screen structure 500, a side screen 501 rotates relative to a fixed part 503, one end of an FPC 505 is fixed at the fixed part 503, and the other end moves with the side screen 501, and in the process of the side screen 501 changing from a folded state to an unfolded state, the form of the redundant length of the FPC 505 is not controlled, and is easy to be pressed by the structure (the fixed part or the side screen) to appear a folded state. When the PFC is folded, there is almost no round corner transition or the round corner is very small, stress concentration occurs at the folding position, and the copper in the FPC is easy to break and fail. Figure 1A Figure 1B SUMMARY

[0003] Therefore, the present application provides a flexible circuit board assembly with controllable redundant length.

[0004] In a first aspect, the present application provides a flexible circuit board assembly. The flexible circuit board assembly comprises a flexible circuit board and a control structure. The control structure comprises a transmission part and two reels. The two reels are arranged at intervals on the transmission part. The flexible circuit board passes between the two reels. The transmission part drives the two reels to rotate, so that the flexible circuit board is wound on the outer circumferential side of the two reels.

[0005] In the above design, the redundant length of the flexible circuit board is converted from a free form into a round arc form driven by the control structure to bend, the stress is uniformly dispersed on the round arc of the flexible circuit board, the stress concentration on the flexible circuit board is avoided, and the service life of the flexible circuit board is improved. ​​

[0006] In one possible design, the two reels have the same diameter and are symmetrically rotated about the rotation axis of the transmission member.

[0007] In the above design, the two reels are symmetrically arranged about the rotation axis of the transmission member, so that the flexible circuit board moves stably.

[0008] In one possible design, the length L of the reel in the axial direction is greater than the width W of the flexible circuit board, and the difference between the length L and the width W is in the range of 0.8mm-1.2mm.

[0009] In the above design, the length L of the reel in the axial direction is greater than the width W of the flexible circuit board, so that the flexible circuit board can be stably wound on the reel without falling off during the rotation of the reel.

[0010] The present application provides another flexible circuit board assembly. The flexible circuit board assembly comprises a flexible circuit board and a control structure. The control structure comprises a transmission member, a guide shaft and a connecting member. The guide shaft is located on one side of the flexible circuit board. One end of the connecting member is arranged on the transmission member, and the other end is connected with the guide shaft. The transmission member drives the connecting member to move the guide shaft, and the guide shaft drives the flexible circuit board to bend.

[0011] In the above design, the transmission member rotates and drives the connecting member to move the guide shaft, and the guide shaft drives the flexible circuit board to bend and form an arc-shaped circular arc shape. The stress is uniformly dispersed on the circular arc of the flexible circuit board, avoiding stress concentration on the flexible circuit board, and improving the service life of the flexible circuit board.

[0012] In one possible design, the number of guide shafts and connecting members is multiple. One end of each connecting member is arranged on the transmission member, and the other end is connected with one guide shaft. Along the extension direction of the flexible circuit board, every two adjacent guide shafts are located on opposite sides of the flexible circuit board respectively. The transmission member drives multiple connecting members to move corresponding guide shafts, and multiple guide shafts drive the flexible circuit board to bend to form multiple circular arcs, so that the flexible circuit board presents a wave shape.

[0013] In the above design, the transmission member drives multiple connecting members to move multiple guide shafts, and multiple guide shafts drive the flexible circuit board to bend to form multiple circular arcs. The bending directions of two adjacent circular arcs are different, and then a wave shape is formed.

[0014] In one possible design, the diameters of the multiple guide shafts are the same, and the circular arcs formed by the bending of the flexible circuit board are semicircular.

[0015] In the above design, the diameters of the multiple guide shafts are the same, but are not limited to this. The diameters of the multiple guide shafts are the same, and the guide shafts provide guidance for the bending of the flexible circuit board, so that the radii of the circular arcs formed by the bending of the flexible circuit board are the same, and the bending changes of the flexible circuit board are consistent.

[0016] In a second aspect, the present application provides an electronic device. The electronic device comprises a fixed part, at least one movable part movable relative to the fixed part, and a flexible circuit board assembly. The circuit board assembly comprises a flexible circuit board and a control structure. The flexible circuit board is provided with a plurality of connecting parts, at least one connecting part is arranged on the movable part, and the control structure is arranged between two connecting parts. The control structure comprises a transmission part and two spools; the two spools are arranged on the transmission part at intervals; the flexible circuit board passes between the two spools; the transmission part drives the two spools to rotate, so that the flexible circuit board is wound on the outer circumferential side of the two spools. Alternatively, the control structure comprises a transmission part, a guide shaft, and a connecting part; the guide shaft is located on one side of the flexible circuit board; one end of the connecting part is arranged on the transmission part, and the other end is connected with the guide shaft; the transmission part drives the connecting part to move, and the guide shaft drives the flexible circuit board to bend.

[0017] In the above design, the flexible circuit board assembly with controllable redundant length is applied in the electronic device, so that the electrical connection of the movable part of the electronic device is stable, and the stability of the function of the electronic device is improved.

[0018] In a possible design, the movable part is a camera assembly, the camera assembly is extended and retracted relative to the fixed part, and one connecting part of the flexible circuit board is arranged on the camera assembly.

[0019] In the above design, the flexible circuit board assembly with controllable redundant length is applied in the electronic device, so that the electrical connection of the camera assembly is stable, and the stability of the function of the electronic device is improved.

[0020] In a possible design, the number of movable parts is two, which are a first middle frame and a second middle frame. The first middle frame and the second middle frame are rotatably arranged on the fixed part, so as to be able to be folded or unfolded. Two connecting parts of the flexible circuit board are arranged on the first middle frame and the second middle frame respectively.

[0021] In the above design, the flexible circuit board assembly with controllable redundant length is applied in the electronic device, so that the electrical connection of the first middle frame and the second middle frame is stable, and the stability of the function of the electronic device is improved.

[0022] In a possible design, the transmission part is in transmission connection with the movable part, so that the transmission part rotates and moves.

[0023] In the above design, the energy of the external driving force is obtained by the movable part, the movable part drives the transmission part to move, and then the control structure controls the redundant length of the flexible circuit board. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor under the premise of these drawings.

[0025] Figure 1A And Figure 1B It is a structural schematic diagram of two electronic devices in the prior art.

[0026] Figure 2A It is a structural schematic diagram of a flexible circuit board assembly provided by an embodiment of the present application.

[0027] Figure 2B It is Figure 2A A structural schematic diagram of the flexible circuit board assembly shown in when the interval of the two connecting parts on the flexible circuit board is large.

[0028] Figure 2C It is Figure 2A A structural schematic diagram of the flexible circuit board assembly shown in when the interval of the two connecting parts on the flexible circuit board is small.

[0029] Figure 3A It is Figure 2A A structural schematic diagram of the flexible circuit board assembly shown in applied in the electronic device of the first embodiment, when the electronic device is in an unfolded state.

[0030] Figure 3B It is Figure 3A A structural schematic diagram of the electronic device shown in when the electronic device is in a folded state.

[0031] Figure 3C It is Figure 3A A schematic diagram of the transmission member and the movement structure transmission connection in the electronic device shown in.

[0032] Figure 4A It is Figure 2A A structural schematic diagram of the flexible circuit board assembly shown in applied in the electronic device of the second embodiment, when the camera assembly is in a retracted state.

[0033] Figure 4B It is Figure 4A A structural schematic diagram of the electronic device shown in when the camera assembly is in an extended state.

[0034] Figure 5 It is a structural schematic diagram of a flexible circuit board assembly provided by another embodiment of the present application.

[0035] Figure 6 It is Figure 5Structure schematic diagram of the flexible circuit board assembly in another embodiment;

[0036] Figure 7A As Figure 5 The flexible circuit board assembly is applied in the electronic device of the third embodiment, and a structure schematic diagram of the electronic device in an unfolded state is shown;

[0037] Figure 7B As Figure 7A A structure schematic diagram of the electronic device in a folded state is shown;

[0038] Figure 7C As Figure 7A A schematic diagram of the arc shape formed by bending the flexible circuit board in the electronic device is shown;

[0039] Figure 7D As Figure 7A A schematic diagram of the transmission member and the movement structure in transmission connection in the electronic device is shown;

[0040] Figure 8A As Figure 6 The flexible circuit board assembly is applied in the electronic device of the fourth embodiment, and a structure schematic diagram of the electronic device in an unfolded state is shown;

[0041] Figure 8B As Figure 8A A structure schematic diagram of the electronic device in a folded state is shown;

[0042] Figure 9A As Figure 5 The flexible circuit board assembly is applied in the electronic device of the fifth embodiment, and a structure schematic diagram of the electronic device when the camera assembly is in a retracted state is shown;

[0043] Figure 9B As Figure 9A A structure schematic diagram of the electronic device when the camera assembly is in an extended state is shown.

[0044] Main element symbol explanation

[0045] Mobile phone 600

[0046] Foldable screen structure 500

[0047] Side screen 501

[0048] Electronic device 400a, 400b, 400c, 400d, 400e

[0049] Fixing member 401, 401a, 503

[0050] First middle frame 402

[0051] Second middle frame 403

[0052] Circuit board 4021, 4031

[0053] First hinge 404

[0054] Gear portion 4041

[0055] Second hinge 405

[0056] Camera assembly 601, 406

[0057] Flexible circuit board assembly 100, 100a, 100b, 200, 200a, 200b, 300

[0058] FPC 10, 603, 505

[0059] First connecting portion 11

[0060] Second connecting portion 12

[0061] Winding portion 13

[0062] First extending portion 14

[0063] Second extending portion 15

[0064] Control structure 20, 20a, 20b, 20c, 210, 210a, 210b, 210c, 31, 31c, 31d

[0065] Transmission member 21, 21a, 21b, 21c, 211, 211a, 211b, 211c, 311, 311a, 311b

[0066] Reel 23, 23a, 23b, 23c

[0067] Connecting member 213, 213a, 213b, 213c, 313a, 313b

[0068] Guide shaft 215, 215a, 215b, 215c, 315, 315a, 315b, 315c, 315d

[0069] The following detailed description will further describe the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0070] In order to further illustrate the technical means and effects taken by the present application to achieve the predetermined application purposes, the following will be described in conjunction with the drawings and embodiments. It is obvious that the described embodiments are only a part of the embodiments of the present application, not all the embodiments.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0072] Some embodiments of the present application provide a flexible circuit board assembly. The flexible circuit board assembly comprises a flexible circuit board and a control structure. The control structure is used to drive the redundant length of the flexible circuit board to bend into a circular arc. The control structure comprises a transmission member and two spools. The two spools are arranged on the transmission member at intervals. The flexible circuit board passes between the two spools along an extension direction. The transmission member drives the two spools to rotate, so that the flexible circuit board is wound on the outer circumferential side of the two spools. Alternatively, the control structure comprises a transmission member, a guide shaft and a connecting member. The guide shaft is located on one side of the flexible circuit board. One end of the connecting member is arranged on the transmission member, and the other end is connected with the guide shaft. The transmission member drives the connecting member to drive the guide shaft to move, and the guide shaft drives the flexible circuit board to bend.

[0073] The flexible circuit board assembly described above provides bending guidance for the flexible circuit board through the transmission member of the control structure driving the spools or the guide shaft, so that the redundant length of the flexible circuit board bends into a circular arc shape of a roll shape or an arc shape. The redundant length of the flexible circuit board is controlled by the control structure, avoiding the uncertainty of the redundant length. The stress is uniformly dispersed on the circular arc of the flexible circuit board, avoiding stress concentration, and improving the service life of the flexible circuit board.

[0074] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following examples and features in the examples can be combined with each other without conflict.

[0075] Please refer to Figure 2A An embodiment of the present application provides a flexible circuit board assembly 100 with a controllable redundant length. The flexible circuit board assembly 100 is applied in an electronic device. The electronic device comprises a fixed member and a movable member movable relative to the fixed member. The movable member can perform extension, sliding, rotation, folding and other movements relative to the fixed member. The electronic device includes, but is not limited to, a mobile terminal (e.g., a mobile phone, a tablet computer, a notebook computer, etc.), a wearable device (e.g., a watch, glasses, etc.), a display device (e.g., a television, a display screen, etc.), a camera and a game console, etc.

[0076] The flexible printed circuit assembly 100 comprises a flexible printed circuit (FPC) 10 and a control structure 20. The FPC 10 is provided with a plurality of connecting portions. The plurality of connecting portions comprises a first connecting portion 11 and a second connecting portion 12, but is not limited thereto. The first connecting portion 11 is connected with a moving part, and the second connecting portion 12 is connected with a fixed part, but is not limited thereto. The first connecting portion 11 moves with the moving part, and the distance between the first connecting portion 11 and the second connecting portion 12 becomes larger (as shown in Figure 2B ) or smaller (as shown in Figure 2C ). When the distance between the first connecting portion 11 and the second connecting portion 12 gradually becomes smaller, the FPC 10 has a redundant length. The control structure 20 is arranged between the first connecting portion 11 and the second connecting portion 12. The control structure 20 drives the FPC 10 to bend and move, so that the FPC 10 bends to form a shape of a circular arc with a roll shape. The redundant length of the FPC 10 is controlled by the control structure 20, and the uncertainty of the redundant length is avoided.

[0077] The redundant length of the FPC 10 is converted from a free shape to a shape of a circular arc with a roll shape driven by the control structure 20, stress is uniformly dispersed on the circular arc of the FPC 10, stress concentration is avoided on the FPC 10, and the service life of the FPC 10 is improved.

[0078] Please continue to refer to Figure 2A , the control structure 20 comprises a transmission part 21 and two spools 23. The two spools 23 are arranged at intervals on the transmission part 21. The FPC 10 passes between the two spools 23 along an extension direction, as shown in Figure 2B . The transmission part 21 drives the two spools 23 to rotate, so that the FPC 10 is wound on the outer circumferential side of the two spools 23 as a whole, as shown in Figure 2C .

[0079] Specifically, please refer to Figure 2B , the FPC 10 further comprises a winding joint 13, a first extension portion 14 and a second extension portion 15 located on both sides of the winding joint 13 between the first connecting portion 11 and the second connecting portion 12. The winding joint 13 passes between the two spools 23 and is wound on the two spools 23 in a substantially S shape. When the first connecting portion 11 moves towards the second connecting portion 12 with the moving part, the first extension portion 14 and the second extension portion 15 respectively generate a redundant length. The transmission part 21 rotates and drives the two spools 23 to rotate, and the first extension portion 14 and the second extension portion 15 of the FPC 10 rotate with the spools 23 and are wound on the outer circumferential side of the first connecting portion 11 and the second connecting portion 12 as a whole.

[0080] In a possible implementation, when the position of the second connecting portion 12 or the first connecting portion 11 relative to the fixing member is unchanged, the transmission member 21 rotates while moving relative to the fixing member, so that no redundant length is generated when the first extending portion 14 and the second extending portion 15 are simultaneously released and wound, and the force is uniform. For example, when the position of the second connecting portion 12 relative to the fixing member is unchanged, the transmission member 21 rotates while moving in a direction away from the second connecting portion 12 to release the first extending portion 14 and the second extending portion 15, and no redundant length is generated for the second extending portion 15; the transmission member 21 rotates and moves in a direction towards the second connecting portion 12 to avoid generating excessive tension on the second extending portion 15 when the first extending portion 14 and the second extending portion 15 are simultaneously wound, so that the first extending portion 14 and the second extending portion 15 bear uniform winding force.

[0081] In a possible implementation, the first extending portion 14 and the second extending portion 15 have the same length, but are not limited thereto. The control structure 20 is substantially located at the middle symmetric position of the first connecting portion 11 and the second connecting portion 12, which further improves the uniform force bearing effect of the first extending portion 14 and the second extending portion 15. It can be understood that in other embodiments, the first extending portion 14 and the second extending portion 15 can have different lengths, and part of the first extending portion 14 or the second extending portion 15 can be wound on the two winding shafts 23.

[0082] The diameter D of the winding shaft 23 satisfies 1 mm≤D≤5 mm, but is not limited thereto. The diameter D of the winding shaft 23 is set according to the bending radius requirement of the FPC 10 and the space in the electronic device.

[0083] To stably wind the FPC 10 on the winding shaft 23 without falling off, the length L of the winding shaft 23 in the axial direction is greater than the width W of the FPC 10, so that the FPC 10 is not easy to fall off the winding shaft 23 when the winding shaft 23 rotates. The difference between the length L and the width W is in the range of 0.8 mm-1.2 mm. For example, the difference between the length L and the width W is 1 mm.

[0084] It can be understood that in other embodiments, the electronic device can also include two moving members, and the first connecting portion 11 and the second connecting portion 12 of the FPC 10 are connected with the two moving members respectively. The first connecting portion 11 and the second connecting portion 12 can move with the two moving members. The control structure 20 is arranged between the first connecting portion 11 and the second connecting portion 12, and the position of the transmission member 21 relative to the fixing member is unchanged, and the transmission member 21 only rotates to simultaneously wind or release the first extending portion 14 and the second extending portion 15.

[0085] It can be understood that in other embodiments, the plurality of connecting portions of the FPC 10 can further include a third connecting portion (not shown in the figure). The first connecting portion 11, the second connecting portion 12 and the third connecting portion are sequentially arranged in the extension direction of the FPC 10. The second connecting portion 12 is fixedly arranged in the electronic device and does not change in position relative to the fixing member. The first connecting portion 11 and the third connecting portion are respectively connected with the moving member and move. The number of the control structures 20 is two, and the control structures 20 are respectively arranged between the first connecting portion 11 and the second connecting portion 12 and between the second connecting portion 12 and the third connecting portion.

[0086] In order to make the winding and unwinding of the FPC 10 uniform, the diameters of the two reels 23 are the same, and the distances of the two reels 23 from the rotation shaft of the transmission member 21 are equal, so that the two reels 23 rotate symmetrically about the rotation shaft of the transmission member 21. The rotation speeds of the first extension portion 14 and the second extension portion 15 during winding and unwinding are uniform, which improves the motion stability of the FPC 10. It can be understood that in other embodiments, the diameters of the two reels 23 can also be different, and the distances of the two reels 23 from the rotation shaft of the transmission member 21 can also be unequal. The outer circumferential side of the whole of the two reels 23 on which the FPC 10 is wound is substantially in the shape of a cam.

[0087] The reel 23 of the control structure 20 provides guidance for the redundant length of the FPC 10 to bend to present a circular arc transition mode. In order to avoid the winding force of the reel 23 on the FPC 10 being too large and damaging the FPC 10, the FPC 10 is provided with sufficient length, and the first extension portion 14 and the second extension portion 15 wound on the outer circumferential side of the two reels 23 do not contact or partially contact each other.

[0088] The transmission member 21 can be drivingly connected with a moving structure in the electronic device through a transmission structure, so that the transmission member 21 rotates or moves. The transmission structure can be a structure such as a gear transmission, a connecting rod and a sliding block that can realize transmission. Alternatively, the transmission member 21 can be connected with a driving structure arranged in the electronic device, and the driving structure drives the transmission member 21 to move. The rotation speed of the transmission member 21 and the diameter of the reel 23 can be set according to the change amount of the distance between the first connecting portion 11 and the second connecting portion 12 and the speed of the moving member.

[0089] First embodiment

[0090] Please refer to Figure 3A and Figure 3B, the electronic device 400a is a mobile terminal device, such as a folding screen mobile phone or a folding electronic reader. The number of moving parts is two, which are the first middle frame 402 and the second middle frame 403. The first middle frame 402 and the second middle frame 403 are respectively rotatably arranged on the fixed part 401. Specifically, the first middle frame 402 is rotationally connected with the first hinge 404, the first hinge 404 is connected with the first middle frame 402 and has no relative rotation. The first hinge 404 is rotatably arranged on the fixed part 401; the second middle frame 403 is rotationally connected with the second hinge 405, the second hinge 405 is connected with the second middle frame 403 and has no relative rotation. The second hinge 405 is rotatably arranged on the fixed part 401. The FPC 10 passes through the outer circumferential side of the first hinge 404 and the second hinge 405 as a whole in the extending direction, and the first connecting part 11 is arranged on the circuit board 4021 of the first middle frame 402, the second connecting part 12 is arranged on the circuit board 4031 of the second middle frame 403, and the FPC 10 realizes electrical connection of the first middle frame 402 and the second middle frame 403. The first middle frame 402 and the second middle frame 403 can be rotated relative to the fixed part 401 to form a plane, as shown in Figure 3A . The first middle frame 402 and the second middle frame 403 can be rotated relative to the fixed part 401 to fold together, as shown in Figure 3B . The number of control structures of the flexible circuit board assembly 100a is two, which are control structure 20a and control structure 20b. The two spools 23a of the control structure 20a are arranged on the FPC 10 and located between the first connecting part 11 and the first hinge 404. The two spools 23b of the control structure 20b are arranged on the FPC 10 and located between the second connecting part 12 and the second hinge 405.

[0091] When the first middle frame 402 and the second middle frame 403 are converted from the folded state to the unfolded state by the external driving force, the FPC 10 has a redundant length on both sides of the fixed part 401. The transmission part 21a rotates and moves to drive the two spools 23a to rotate, and the transmission part 21b rotates and moves to drive the two spools 23b to rotate, so that the parts of the FPC 10 located on both sides of the fixed part 401 are wound on the two spools 23a and the two spools 23b respectively. The FPC 10 is connected between the first middle frame 402 and the second middle frame 403 in a circular arc transition mode, and the control structure 20a and the control structure 20b control the redundant length of the FPC 10 to avoid the appearance of the folded mode.

[0092] When the first middle frame 402 and the second middle frame 403 are converted from the unfolded state to the folded state by the external driving force, the transmission part 21a rotates and moves to drive the two spools 23a to rotate, and the transmission part 21b rotates and moves to drive the two spools 23b to rotate, to release the FPC 10 wound on the spool 23a and the spool 23b.

[0093] Under the action of the external driving force, the first hinge 404 rotates with the first middle frame 402, and the second hinge 405 rotates with the second middle frame 403. The transmission member 21a can be in transmission connection with the first hinge 404 (a movement structure in the electronic device) to realize rotation and movement, and the transmission member 21b is in transmission connection with the second hinge 405 (a movement structure in the electronic device) to realize rotation and movement. For example, please refer to Figure 3C The first hinge 404 is provided with a gear portion 4041, the transmission member 21 is a gear structure, and the transmission member 21 is in meshing transmission connection with the gear portion 4041. When the external driving force drives the first middle frame 402 to rotate, the transmission member 21a rotates around its own axis and rotates around the rotation shaft of the first hinge 404 to realize movement.

[0094] It can be understood that in other embodiments, other driving modes can also be used to make the transmission member 21 rotate and move, for example, a separate driving structure such as a motor assembly is arranged in the electronic device 400a, and the motor assembly directly drives the movement of the transmission member 21.

[0095] It can be understood that in other embodiments, in order to reduce the size of the electronic device and simplify the structure of the electronic device, the first middle frame 402 and the second middle frame 403 can also be rotatably arranged on the fixed member 401 through the same hinge (not shown in the figure), for example, the hinge includes an axis and two hinges rotatably arranged on the axis, and the first middle frame 402 and the second middle frame 403 are connected with the two hinges respectively.

[0096] Second embodiment

[0097] Please refer to Figure 4A and Figure 4B The electronic device 400b is a mobile terminal device including a movement member with telescopic movement, for example, a mobile phone. The fixed member 401a is a circuit board on the middle frame or the shell structure of the electronic device 400b. The movement member is a camera assembly 406. The camera assembly 406 is slidably arranged on the fixed member 401a. The camera assembly 406 can be extended out of the shell of the electronic device 400b or retracted into the shell. The first connecting portion 11 of the FPC 10 is arranged on the camera assembly 406, and the second connecting portion 12 is arranged on the fixed member 401a. The two spools 23c of the control structure 20c are arranged on the FPC 10 and located between the first connecting portion 11 and the second connecting portion 12.

[0098] When the camera assembly 406 is converted from the extended state to the retracted state, the distance between the first connecting portion 11 and the second connecting portion 12 of the FPC 10 is shortened, the transmission member 21c is rotated and moved to drive the first extension portion 14 and the second extension portion 15 of the FPC 10 to be wound around the outer circumferential side of the two spools 23c, so that the FPC 10 is connected between the camera assembly 406 and the fixing member 401a in a circular arc transition mode, and the control structure 20c controls the redundant length of the FPC 10 to avoid the folding mode.

[0099] The electronic device 400b further includes a driving structure (not shown in the figure). The transmission member 21c can be connected with the driving structure, and the driving structure drives the camera assembly 406 to move and drives the transmission member 21c to rotate and move.

[0100] Please refer to Figure 5 Another embodiment of the present application provides a flexible circuit board assembly 200 with a controllable redundant length. The flexible circuit board assembly 200 is applied in an electronic device. The electronic device includes a fixing member and a moving member movable relative to the fixing member. The flexible circuit board assembly 200 includes an FPC 10 and a control structure 210. The FPC 10 is provided with a plurality of connecting portions. The plurality of connecting portions include a first connecting portion 11 and a second connecting portion 12, but are not limited thereto. The first connecting portion 11 is connected with the moving member, and the second connecting portion 12 is connected with the fixing member, but is not limited thereto. For example, the electronic device can further include another moving member, and the second connecting portion 12 can be connected with the another moving member, so that the first connecting portion 11 and the second connecting portion 12 of the FPC 10 are both movable. The first connecting portion 11 moves with the moving member, and the distance between the first connecting portion 11 and the second connecting portion 12 becomes larger Figure 5 (the position shown by the dashed line in FIG. 26A) or smaller Figure 5 (the position shown by the solid line in FIG. 26A). In the process that the distance between the first connecting portion 11 and the second connecting portion 12 gradually becomes smaller, the FPC 10 has a redundant length. The control structure 210 is arranged between the first connecting portion 11 and the second connecting portion 12. The control structure 210 drives the FPC 10 to bend and move, so that the FPC 10 is bent to form an arc transition mode. The redundant length of the FPC 10 is limited by the control structure 210, so that the radius R of the arc formed by the bending of the FPC 10 meets the requirements, for example, the radius R is greater than 1 mm.

[0101] The redundant length of the FPC 10 is converted from the free mode to the arc mode driven by the control structure 210 to bend, and the stress is uniformly dispersed on the arc of the FPC 10, so that the stress concentration on the FPC 10 is avoided, and the service life of the FPC 10 is improved.

[0102] The control structure 210 comprises a transmission member 211, a guide shaft 215 and a connecting member 213. The number of the transmission member 211, the guide shaft 215 and the connecting member 213 is one respectively, but is not limited to this. The transmission member 211 is in transmission connection with the motion structure in the electronic device, so that the transmission member 211 can rotate or move. One end of the connecting member 213 is arranged on the transmission member 211, and the other end is arranged on the guide shaft 215. The guide shaft 215 is located on one side of the FPC 10. The transmission member 211 rotates and drives the connecting member 213 to move the guide shaft 215. The guide shaft 215 moves to contact one side of the FPC 10, and continues to move to drive the FPC 10 to bend and form a circular arc shape. The FPC 10 moves along the guide shaft 215 by its own tension, and the circular arcs formed on both sides of the guide shaft 215 are substantially consistent.

[0103] The redundant length of the FPC 10 is converted from the free shape to the circular arc shape driven by the control structure 210 to bend, and the stress is uniformly dispersed on the circular arc of the FPC 10, so that stress concentration is avoided on the FPC 10, and the service life of the FPC 10 is improved.

[0104] The guide shaft 215 is rotatably arranged on the connecting member 213, so that the guide shaft 215 rolls along the FPC 10 to reduce the friction between the guide shaft 215 and the FPC 10. It can be understood that in other embodiments, the guide shaft 215 and the connecting member 213 can also be connected together and have no relative rotation.

[0105] The diameters of the plurality of guide shafts 215 are the same, but are not limited to this. The diameters of the plurality of guide shafts 215 are the same, the guide shaft 215 provides guidance for the bending of the FPC 10, so that the radii of the circular arcs formed by the bending of the FPC 10 are the same, and the bending changes of the FPC 10 are consistent.

[0106] It can be understood that in other embodiments, the diameters of the guide shafts 215 can also be different, and the FPC 10 bends to form a plurality of circular arcs with different radii.

[0107] It can be understood that in other embodiments, the number of the guide shaft 215 and the connecting member 213 can also be a plurality respectively. For example, in another embodiment, please refer to Figure 6The control structure 31 of the flexible circuit board assembly 300 is substantially the same as the control structure 210, except that the control structure 31 has two connecting members, i.e., connecting member 313a and connecting member 313b, and two guide shafts, i.e., guide shaft 315a and guide shaft 315b. One end of the connecting member 313a is arranged on the transmission member 311, and the other end is arranged on the guide shaft 315a. One end of the connecting member 313b is arranged on the transmission member 311, and the other end is arranged on the guide shaft 315b. Along the extension direction of the FPC 10, the guide shaft 315a and the guide shaft 315b are respectively located on opposite sides of the FPC 10. The first connecting portion 11 and the second connecting portion 12 of the FPC 10 move relative to each other, and the distance between the two changes (as shown by the dashed line in Figure 6 ) or decreases (as shown by the solid line in Figure 6 ). When the distance between the first connecting portion 11 and the second connecting portion 12 of the FPC 10 decreases to generate the redundant length, the transmission member 311 drives the connecting member 313a and the connecting member 313b to move the corresponding guide shaft 315a and guide shaft 315b, respectively. The guide shaft 315a and the guide shaft 315b move from the two sides of the FPC 10 to contact the FPC 10 and continue to move to bend the FPC 10 to form two circular arcs, and the two circular arcs form a wave shape.

[0108] It can be understood that in other embodiments, the number of guide shafts 215 and connecting members 213 can also be three, four, or other numbers. The number of guide shafts 215 and connecting members 213 can be set according to the redundant length generated by the FPC 10. As long as along the extension direction of the FPC 10, every two adjacent guide shafts 215 are respectively located on opposite sides of the FPC 10, the transmission member 211 drives the plurality of connecting members 213 to move the plurality of guide shafts 215, and the plurality of guide shafts 215 drives the FPC 10 to bend to form a plurality of circular arcs, the bending directions of adjacent two circular arcs are different, and then the FPC 10 forms a wave shape.

[0109] It can be understood that in other embodiments, the number of transmission members 211 can also be multiple. Each transmission member 211 is connected with a connecting member 213 to drive a corresponding guide shaft 215 to contact the FPC 10, so that the FPC 10 is bent to form a circular arc.

[0110] Third embodiment

[0111] Please refer to Figure 7A and Figure 7B , the electronic device 400c is substantially the same as the electronic device 400a in the first embodiment, except that the control structure of the electronic device 400c is different from the control structures 20a and 20b of the electronic device 400a. The control structure of the electronic device 400c is the control structure 210 as shown in Figure 5 .

[0112] The number of control structures of the flexible circuit board assembly 200a in the electronic device 400c is two, which are control structure 210a and control structure 210b. The control structure 210a is located between the first hinge 404 and the circuit board 4021 of the first middle frame 402; and the control structure 210b is located between the second hinge 405 and the circuit board 4031 of the second middle frame 403.

[0113] When the first middle frame 402 and the second middle frame 403 are converted from the folded state to the unfolded state by the external driving force, the FPC 10 has a redundant length on both sides of the fixing member 401. The transmission member 211a of the control structure 210a rotates and moves to make the connecting member 213a drive the guide shaft 215a to contact the FPC 10, so that the FPC 10 between the first hinge 404 and the circuit board 4021 is bent to form an arc; and the transmission member 211b of the control structure 210b rotates and moves to make the connecting member 213b drive the guide shaft 215b to contact the FPC 10, so that the FPC 10 between the second hinge 405 and the circuit board 4031 is bent to form an arc. The FPC 10 is connected between the first middle frame 402 and the second middle frame 403 in the arc transition form, and the control structure 210a and the control structure 210b control the redundant length of the FPC 10 to avoid the folding form.

[0114] When the first middle frame 402 and the second middle frame 403 are converted from the unfolded state to the folded state by the external driving force, the portions of the FPC 10 between the first hinge 404 and the circuit board 4021 and between the second hinge 405 and the circuit board 4031 are substantially planar, respectively. The transmission member 211a and the transmission member 211b drive the guide shaft 215a and the guide shaft 215b to move to be tangent to the substantially planar portions on the FPC 10, but are not limited thereto. For example, in another embodiment, the guide shaft 215a and the guide shaft 215b can also not contact the FPC 10.

[0115] It can be understood that in other embodiments, when the electronic device 400c is in the folded state, the portions of the FPC 10 between the first hinge 404 and the circuit board 4021 and between the second hinge 405 and the circuit board 4031 can also be a curved surface, respectively, and the guide shaft 215a and the guide shaft 215b intersect the curved surface, respectively. The bending radius of the curved surface is greater than the radius of the arc of the FPC 10 when the electronic device 400c is in the unfolded state.

[0116] Please refer to Figure 7CWhen the electronic device 400c is in the unfolded state, the arc generated by the FPC 10 is a semicircle, the distance l between the guide shafts 215a and 215b and the symmetry axis O1 of the fixing member 401a satisfies l = 4R. The length N of the wave shape formed by the FPC 10 between the first hinge 404 and the circuit board 4021 satisfies N = 2.5πR. Wherein, R is the radius of the arc formed by the bending of the FPC 10, R > 1mm. It can be understood that in other embodiments, the arc generated by the FPC 10 can also be a minor arc, and correspondingly, the distance l can also be less than 4R.

[0117] The transmission member 211a is in transmission connection with the first hinge 404 (movement structure) to realize rotation and movement, and the transmission member 211b is in transmission connection with the second hinge 405 (movement structure) to realize rotation and movement. For example, as shown in Figure 7D The first hinge 404 is provided with a gear portion 4041, the transmission member 211a is a gear structure, and the transmission member 211a is in meshing transmission connection with the gear portion 4041. One end of the connecting member 213 is connected to the transmission member 211 and has no relative rotation, and the other end is rotationally connected with the guide shaft 215a. When the external driving force drives the first middle frame 402 to rotate, the transmission member 211a rotates around its own axis and rotates around the rotation shaft of the first hinge 404 to realize movement, thereby realizing the contact of the guide shaft 215a with the FPC 10 to make the FPC 10 bend.

[0118] The electronic device 400c utilizes the movement of the movement member (the first middle frame 402, the first hinge 404, the second middle frame 403 and the second hinge 405) to obtain the energy of the external driving force, and the movement of the movement member drives the movement of the transmission member 211a and the transmission member 211b, thereby making the control structure 210a and the control structure 210b control the redundant length of the FPC 10.

[0119] Fourth embodiment

[0120] Please refer to Figure 8A and Figure 8B The electronic device 400d is substantially the same as the electronic device 400a in the first embodiment, and the difference lies in that the control structure of the electronic device 400d is different from the control structure 20a and 20b of the electronic device 400a. The control structure of the electronic device 400d is the same as the structure of the control structure 31 as shown in Figure 6 .

[0121] The number of control structures of the flexible circuit board assembly 300 in the electronic device 400d is two, which are the control structure 31c and the control structure 31d. The control structure 31c is located between the first hinge 404 and the circuit board 4021 of the first middle frame 402; and the control structure 31d is located between the second hinge 405 and the circuit board 4031 of the second middle frame 403.

[0122] The first middle frame 402 and the second middle frame 403 are driven by an external driving force to change from the folded state to the unfolded state, and the FPC 10 has a redundant length on both sides of the fixing member 401. The two guide shafts 315c of the control structure 31c contact the two sides of the FPC 10, and the FPC 10 between the first hinge 404 and the circuit board 4021 is bent to form two circular arcs. The two guide shafts 315d of the control structure 31d contact the two sides of the FPC 10, and the FPC 10 between the second hinge 405 and the circuit board 4031 is bent to form two circular arcs. The FPC 10 is connected between the first middle frame 402 and the second middle frame 403 in a circular arc transition mode, and the control structure 31c and the control structure 31d control the redundant length of the FPC 10, avoiding the occurrence of a folded form.

[0123] Fifth embodiment

[0124] Please refer to Figure 9A and Figure 9B The electronic device 400e is substantially the same as the electronic device 400b in the second embodiment, and the difference is that the control structure 210c of the electronic device 400e is different from the control structure 20c of the electronic device 400b. The control structure 210c of the electronic device 400e is the same as the control structure 210 as shown in Figure 5 . The control structure 210c is located between the first connection part 11 and the second connection part 12 of the FPC 10.

[0125] When the camera assembly 406 changes from the extended state to the retracted state, the distance between the first connection part 11 and the second connection part 12 of the FPC 10 becomes shorter. The transmission member 211c rotates and moves to drive the connecting member 213c to move the guide shaft 215c to contact the FPC 10, and continues to move to bend the FPC 10 to form a circular arc. The FPC 10 is connected between the camera assembly 406 and the fixing member 401a in a circular arc transition mode, and the control structure 210c controls the redundant length of the FPC 10, avoiding the occurrence of a folded form.

[0126] In the above electronic device, the flexible circuit board assembly drives the spool or the guide shaft to move through the transmission member of the control structure, and provides a bending guide for the FPC, so that the redundant length of the FPC is bent to form a coiled or arc-shaped circular arc form. The redundant length of the FPC is controlled by the control structure, avoiding the uncertainty of the redundant length. The stress is uniformly dispersed on the circular arc of the FPC, avoiding stress concentration, and improving the service life of the FPC.

[0127] The above embodiments are only used to illustrate the technical solutions of the present application and not to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and essence of the technical solutions of the present application.

Claims

1. A flexible circuit board assembly comprising a flexible circuit board and a control structure, characterized in that, The flexible circuit board comprises a first connecting portion, a first extending portion, a winding portion, a second extending portion and a second connecting portion connected in sequence; The control structure is located between the first connecting portion and the second connecting portion, and comprises: a transmission member; and two spools are arranged on the transmission member at intervals, the diameters of the two spools are the same, and the two spools rotate symmetrically relative to the rotation axis of the transmission member; the winding portion is between the two spools; The transmission member is used to rotate and drive the two spools to rotate, so that the first extending portion and the second extending portion are wound on the outer circumferential side of the two spools, and is used to bend the redundant length of the flexible circuit board into an arc or a circular arc.

2. The flexible circuit board assembly of claim 1, wherein: The length L of the spool in the axial direction is greater than the width W of the flexible circuit board, and the difference between the length L and the width W is in the range of 0.8mm-1.2mm.

3. A flexible circuit board assembly comprising a flexible circuit board and a control structure, characterized in that, The control structure comprises: a transmission member; a guide shaft located on one side of the flexible circuit board; a connecting member, one end of which is arranged on the transmission member, and the other end of which is connected with the guide shaft; The transmission member drives the connecting member to drive the guide shaft to rotate around the axis of the transmission member, and the guide shaft drives the flexible circuit board to bend.

4. The flexible circuit board assembly of claim 3, wherein: The number of the guide shafts and the connecting members is multiple, one end of each connecting member is arranged on the transmission member, and the other end is connected with one guide shaft; Along the extending direction of the flexible circuit board, every two adjacent guide shafts are located on opposite sides of the flexible circuit board respectively; The transmission member drives multiple connecting members to drive corresponding guide shafts to move, and multiple guide shafts drive the flexible circuit board to bend to form multiple circular arcs to present a wavy shape.

5. The flexible circuit board assembly of claim 4, wherein: The diameters of the multiple guide shafts are the same, and the circular arcs formed by the bending of the flexible circuit board are semicircular.

6. An electronic device comprising a stationary part and at least one moving part movable relative to the stationary part, characterized in that Further comprising the flexible circuit board assembly of any one of claims 1-5, the flexible circuit board is provided with multiple connecting portions, at least one connecting portion is arranged on the moving member, and the control structure is arranged between two connecting portions.

7. The electronic device of claim 6, wherein: The moving member is a camera assembly, the camera assembly extends and retracts relative to the fixed member, and one connecting portion of the flexible circuit board is arranged on the camera assembly.

8. The electronic device of claim 6, wherein: The number of the moving members is two, which are a first middle frame and a second middle frame; the first middle frame and the second middle frame are rotatably arranged on the fixed member to be able to be folded or unfolded; and two connecting portions of the flexible circuit board are arranged on the first middle frame and the second middle frame respectively.

9. The electronic device of claim 6, wherein: The transmission member is in transmission connection with the moving member to make the transmission member rotate and move.

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