CN116709636B - Circuit board structure and electronic equipment - Google Patents

Abstract

The embodiment of the present application provides a circuit board structure and an electronic device. The circuit board structure includes a flexible circuit board and at least one length adjustment mechanism, the length adjustment mechanism includes a support assembly, the support assembly includes at least two support members, the flexible circuit board is wound around each support member, and each support member is supported on two opposite sides of the flexible circuit board to straighten the flexible circuit board; at least one of the at least two support members located on different sides of the flexible circuit board moves back and forth between the two opposite sides of the flexible circuit board, and drives the flexible circuit board to move relative to the support member, so that the length of the flexible circuit board supported between the two support members is adjustable. In this way, the FPC can have a stable bending shape during the dynamic bending process, thereby avoiding the phenomenon of the FPC being bent and failing during the dynamic bending process.

Description

Circuit board structure and electronic equipment

Technical Field

The present application relates to the technical field of electronic products, and in particular to circuit board structures and electronic equipment.

Background Art

With the development of display technology, the technology of flexible screens is becoming more and more mature, and the use of flexible screens should become more and more widespread. Electronic devices can use flexible screens to make the electronic devices foldable.

In the related art, an electronic device may include a housing, a circuit board assembly, and a rotating assembly, wherein the housing includes two middle frames, and the two middle frames are rotatably connected to opposite sides of the rotating assembly so that the two middle frames rotate relative to each other to realize the conversion of the electronic device between the unfolded state and the folded state. The circuit board assembly includes a flexible printed circuit board (FPC) and two circuit boards. The circuit boards are connected to the middle frames in a one-to-one correspondence, one end of the FPC is electrically connected to one circuit board, and the other end of the FPC passes through the rotating assembly and is electrically connected to the other circuit board.

However, when the electronic device is transformed from the unfolded state to the folded state, the FPC will also bend. During the dynamic bending process, the FPC may be bent to death, and even cause the FPC to fail due to the bending phenomenon.

Summary of the invention

The embodiments of the present application provide a circuit board structure and an electronic device, which can enable an FPC to have a stable bending shape during a dynamic bending process, thereby preventing the FPC from being bent to death and failing during the dynamic bending process.

In a first aspect, an embodiment of the present application provides a circuit board structure, including a flexible circuit board and at least one length adjustment mechanism, the length adjustment mechanism includes a support assembly, the support assembly includes at least two support members, the flexible circuit board is wound around each support member, and each support member is respectively supported on two opposite sides of the flexible circuit board to straighten the flexible circuit board;

At least one of the at least two support members located on different sides of the flexible circuit board moves back and forth between the two opposite sides of the flexible circuit board, and drives the flexible circuit board to move relative to the support member, so that the length of the flexible circuit board supported between the two support members is adjustable. In the present application, the support members respectively supported on the two opposite sides of the flexible circuit board move closer to each other during the reciprocating movement to reduce the length of the flexible circuit board supported between the two support members, thereby releasing the redundancy generated by the flexible circuit board during the dynamic bending process, so that the flexible circuit board remains in a straight state when the electronic device is in a folded state. Alternatively, the support members move away from each other to increase the length of the flexible circuit board supported between the two support members, thereby absorbing and storing the redundancy generated by the flexible circuit board during the dynamic bending process. And part of the flexible circuit board is always in a state of being stretched straight by the support member. In this way, the flexible circuit board can have a stable bending shape during the dynamic bending process, thereby avoiding the phenomenon of dead bending and failure of the flexible circuit board during the dynamic bending process.

In a possible implementation, in the circuit board structure provided by the embodiment of the present application, the at least two support members include at least one first support member and at least one second support member, and the first support member and the second support member are respectively located on two opposite sides of the flexible circuit board;

At least one first support member and at least one second support member both reciprocate in the horizontal direction or the vertical direction, and the first support member moves in opposite directions to the second support member. In this way, when the moving distances are equal, the length of the flexible circuit board added between the first support member and the second support member is longer. Alternatively, when the length of the flexible circuit board added between the first support member and the second support member is equal, the moving distance of the first support member and the second support member is smaller.

In a possible implementation, in the circuit board structure provided by the embodiment of the present application, the first support member and the second support member are evenly spaced in sequence. In this way, the force on the flexible circuit board is relatively uniform, and it is also convenient to calculate the redundancy of the flexible circuit board absorbed by the first support member and the second support member during the dynamic bending process.

In a possible implementation, in the circuit board structure provided by the embodiment of the present application, the first support member and the second support member are both rotating shafts, and the first support member and the second support member both rotate around their own axes. In this way, the flexible circuit board can move smoothly relative to the first support member or the second support member, reducing the friction between the flexible circuit board and the first support member or the second support member, and preventing the first support member and the second support member from applying excessive pulling force to the flexible circuit board when moving back and forth, thereby damaging the flexible circuit board.

In a possible implementation, in the circuit board structure provided by the embodiment of the present application, the diameters of the first support member and the second support member are the same. In this way, there is no need to distinguish the first support member and the second support member during installation. Thus, the first support member and the second support member are prevented from being installed in the wrong position during installation, which saves installation time and improves installation efficiency.

In a possible implementation, in the circuit board structure provided in the embodiment of the present application, the support assembly further includes two third support members, and the flexible circuit board is wound on the third support members;

Each first support member and each second support member are located between two third support members. In this way, the third support member can provide a guiding function for the flexible circuit board, so as to facilitate controlling the direction in which the flexible circuit board is wound into or out of the support assembly.

In a possible implementation, in the circuit board structure provided by the embodiment of the present application, the third support member is a rotating shaft, and the third support member rotates around its own axis, so that the flexible circuit board can smoothly wind into or out of the support assembly.

In a possible implementation, in the circuit board structure provided in the embodiment of the present application, the length adjustment mechanism further includes a housing, the housing is disposed on the flexible circuit board, and the first support member, the second support member, and the third support member are all located in the housing. In this way, the first support member, the second support member, and the third support member can be protected and supported by the housing.

In a possible implementation, in the circuit board structure provided in the embodiment of the present application, the length adjustment mechanism further includes at least one driving component, the driving component being used to drive the support member to reciprocate between two opposite sides of the flexible circuit board, thereby facilitating the control of the moving distance of the support member.

In a possible implementation, in the circuit board structure provided by an embodiment of the present application, at least one driving component includes at least one first driving component, and the first driving component is used to drive the first support member to reciprocate between two opposite sides of the flexible circuit board.

In a possible implementation, in the circuit board structure provided by an embodiment of the present application, at least one driving component includes at least one second driving component, and the second driving component is used to drive the second support member to reciprocate between two opposite sides of the flexible circuit board.

In a possible implementation, in the circuit board structure provided in the embodiment of the present application, the first drive assembly and the second drive assembly are both connected to the housing;

The first driving assembly and the second driving assembly are voice coil motors, air cylinders or hydraulic cylinders.

In a possible implementation, in the circuit board structure provided in the embodiment of the present application, the length adjustment mechanism further includes a bearing assembly, the bearing assembly includes a plurality of bearings, and both ends of the support member are sleeved with bearings;

The bearings on the reciprocating support are connected to the drive assembly.

In a possible implementation, in the circuit board structure provided in the embodiment of the present application, the length adjustment mechanism further includes a guide assembly, the guide assembly includes a plurality of guide rails, the guide rails are located in the housing, and the guide direction of the guide rails is consistent with the moving direction of the support member;

The reciprocating support member is slidably connected with the guide rail. Like this, when the support member reciprocates, the guide rail provides guidance for the support member, so that the movement of the support member is more stable.

In a possible implementation, in the circuit board structure provided in the embodiment of the present application, the length adjustment mechanism further includes a limit assembly, the limit assembly includes at least two limit members, the limit members are located in the shell, and the limit members are used to limit the movement distance of the support member.

In a possible implementation, the circuit board structure provided in the embodiment of the present application, the length adjustment mechanism further includes an elastic component, the elastic component includes a plurality of elastic members, the elastic members are located in the housing, and at least one elastic member is disposed between the support member and the limit member. The support member is supported by the elastic member, and when the support member reciprocates, the elastic member performs a telescopic movement following the reciprocating movement of the support member.

On the other hand, an embodiment of the present application provides an electronic device, including a first housing, a second housing, a rotating assembly, and any circuit board structure provided in the first aspect above;

The first shell and the second shell are rotatably connected through a rotating assembly. The circuit board structure is arranged on the rotating assembly, and two ends of the circuit board structure are respectively connected to the first shell and the second shell.

In a possible implementation, the electronic device provided in the embodiment of the present application further includes at least one fourth support member, the flexible circuit board of the circuit board structure is wound on the fourth support member, and the fourth support member is located between the length adjustment mechanism and the rotating assembly of the circuit board structure. The moving direction of the flexible circuit board between the rotating assembly and the length adjustment mechanism is controlled by the fourth support member, so that the flexible circuit board can smoothly enter and exit the length adjustment mechanism.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of an electronic device in a folded state provided by an embodiment of the present application;

FIG2 is a schematic diagram of the structure of an electronic device in an intermediate state provided by an embodiment of the present application;

FIG3 is a schematic structural diagram of an electronic device in an unfolded state provided by an embodiment of the present application;

FIG4 is an exploded view of FIG3 ;

FIG5 is a schematic structural diagram of the rotating assembly in FIG3 ;

FIG6 is a first structural schematic diagram of a flexible circuit board of an electronic device in an unfolded state in the related art;

FIG. 7 is a first structural schematic diagram of a flexible circuit board of an electronic device in an unfolded state in the related art;

FIG8 is a schematic diagram of the structure of the flexible circuit board in FIG7 when it is bent;

Fig. 9 is a partial cross-sectional view 1 of the A-A section in Fig. 3;

FIG10 is a schematic diagram of the internal structure of position B in FIG9 ;

FIG11 is a schematic diagram of the structure of FIG9 in a folded state;

FIG12 is a schematic diagram of the internal structure of position C in FIG11;

FIG13 is a structural schematic diagram 1 of the flexible circuit board and the support member in FIG9 ;

FIG14 is a second structural schematic diagram of the flexible circuit board and the support member in FIG9 ;

FIG15 is a third structural schematic diagram of the flexible circuit board and the support member in FIG9 ;

FIG16 is a fourth structural schematic diagram of the flexible circuit board and the support member in FIG9;

FIG17 is a fifth structural diagram of the flexible circuit board and the support member in FIG9 ;

FIG18 is a schematic structural diagram of the support member and a portion of the flexible circuit board in FIG9 in a first position;

FIG19 is a schematic diagram of the structure of the support member and part of the flexible circuit board in FIG9 ;

FIG20 is a second schematic diagram of the internal structure at B in FIG9 ;

FIG21 is a top view of FIG20;

FIG22 is a connection diagram of the first driving assembly and the first supporting member in FIG21;

FIG23 is a connection diagram of the second driving assembly and the second supporting member in FIG21;

FIG24 is a schematic structural diagram of the bearing assembly, the support member, the limit member and the elastic member in FIG21;

Fig. 25 is a partial cross-sectional view of the section D-D in Fig. 21;

Fig. 26 is a partial cross-sectional view of the section E-E in Fig. 21;

Fig. 27 is a partial cross-sectional view of the F-F section in Fig. 21;

Figure 28 is a second partial cross-sectional view of the A-A section in Figure 3.

Description of reference numerals:

10- first housing of mobile phone;

20- second housing of mobile phone;

30-mobile phone rotating assembly; 31-mobile phone rotating body;

40-Mobile phone flexible display;

51-mobile phone flexible circuit board; 52-mobile phone first circuit board; 53-mobile phone second circuit board;

60- first connecting member;

70- second connecting member;

100 - first housing; 110 - first middle frame; 111 - first middle plate; 112 - first frame; 120 - first back cover;

200 - second housing; 210 - second middle frame; 211 - second middle plate; 212 - second frame; 220 - second back cover;

300-rotating assembly; 310-rotating body; 320-first swing arm; 330-second swing arm;

400-Flexible display;

500-circuit board assembly; 510-flexible circuit board; 510a-first surface; 510b-second surface; 520-first circuit board; 530-second circuit board; 540-length adjustment mechanism; 541-support member; 541a-first support member; 541b-second support member; 541c-third support member; 542-housing; 543-drive assembly; 543a-first drive assembly; 543b-second drive assembly; 544-bearing assembly; 5441-bearing; 5441a-first bearing; 5441b-second bearing; 5441c-third bearing; 5442-bearing seat; 5442a-first bearing seat; 5442b-second bearing seat; 545-guide rail; 546-limiting member; 547-elastic member;

600- fourth support member;

700-Shielding piece.

DETAILED DESCRIPTION

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.

The electronic device provided in the embodiments of the present application 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.

Referring to FIG. 1 to FIG. 3 , the electronic device is a foldable mobile phone as an example for description. The foldable mobile phone may be a mobile phone with a screen folded outwards. Alternatively, the foldable mobile phone may be a mobile phone with a screen folded inwards (as shown in FIG. 2 ).

This application is explained by taking a foldable mobile phone with an inward-folding screen as an example.

The foldable mobile phone may include a first housing 100, a second housing 200, a rotating assembly 300 and a flexible display screen 400. The rotating assembly 300 may be a rotating shaft assembly, or other components capable of achieving rotation. The first housing 100 and the second housing 200 are respectively connected to opposite sides of the rotating assembly 300, and the first housing 100 and the second housing 200 are driven to rotate relative to each other by the rotation of the rotating assembly 300. The flexible display screen 400 is covered on the first housing 100 and the second housing 200. When the first housing 100 and the second housing 200 rotate relative to each other, the flexible display screen 400 also rotates relative to each other.

When the first housing 100 and the second housing 200 move toward each other along the directions indicated by the arrows (dashed arrows and solid arrows) in FIG. 2 , or when the side corresponding to the dashed arrows moves toward the side corresponding to the solid arrows, the foldable mobile phone can be in the folded state shown in FIG. 1 . As shown in FIG. 1 , when the foldable mobile phone is in the folded state, the first housing 100 and the second housing 200 are in a mutually stacked state, and the rotating assembly 300 and the flexible display screen 400 are both in the folded state.

When the first shell 100 and the second shell 200 move in opposite directions toward each other along the directions indicated by the arrows (dashed arrows and solid arrows) in FIG. 2 , or when the sides corresponding to the dashed arrows move in opposite directions away from the sides corresponding to the solid arrows, the foldable mobile phone can be in an unfolded state as shown in FIG. 3 . As shown in FIG. 3 , when the foldable mobile phone is in the unfolded state, the first shell 100 and the second shell 200 cannot continue to rotate, and at this time the first shell 100 and the second shell 200 can be in the same plane, and the rotating assembly 300 and the flexible display screen 400 are both in the unfolded state.

It should be noted that the foldable mobile phone may include two shells, that is, the number of the first shell 100 and the second shell 200 can both be one, so that the foldable mobile phone can be folded into two layers as shown in FIG. 1 .

Alternatively, the foldable mobile phone may include more than two shells, that is, the number of one of the first shell 100 and the second shell 200 is at least one, and the number of the other is at least two, the first shell 100 and the second shell 200 are arranged at intervals, and the adjacent first shells 100 and the second shells 200 are connected by a rotating assembly 300, so that the foldable mobile phone can be folded into three layers or more. In this way, the screen of the foldable mobile phone can be folded inside and the outer screen can be folded.

As shown in FIG. 3 and FIG. 4 , in the present application, the first housing 100 may include a first middle frame 110 and a first back cover 120, and the second housing 200 may include a second middle frame 210 and a second back cover 220. The first middle frame 110 may include a first middle plate 111 and a first frame 112, the first frame 112 is arranged around three adjacent sides of the first middle plate 111, and the other side of the first middle plate 111 faces the rotating assembly 300. The second middle frame 210 may include a second middle plate 211 and a second frame 212, the second frame 212 is arranged around three adjacent sides of the second middle plate 211, and the other side of the second middle plate 211 faces the rotating assembly 300.

The flexible display screen 400 is covered on the first frame 112 and the second frame 212, the first back cover 120 is covered on the first frame 112, the second back cover 220 is covered on the second frame 212, and the first back cover 120 and the second back cover 220 are located on a first side of the first frame 112 or the second frame 212, and the flexible display screen 400 is located on a second side of the first frame 112 or the second frame 212 opposite to the first side. Among them, one of the first back cover 120 and the second back cover 220 can be a display screen, and the display surface of the display screen is away from the flexible display screen 400.

As shown in FIG. 4 and FIG. 5 , in the present application, the rotating assembly 300 may include a rotating body 310, a first swing arm 320 and a second swing arm 330, and the first swing arm 320 and the second swing arm 330 are respectively rotatably connected to opposite sides of the rotating body 310. Thus, the first swing arm 320 and the second swing arm 330 are rotated relative to the rotating body 310. The first swing arm 320 and the second swing arm 330 may be both rotatably connected to the rotating body 310 through a rotating shaft, or may be rotatably connected to the rotating body 310 through other components, and this embodiment is not limited here.

The first swing arm 320 is connected to the first middle plate 111, and the first swing arm 320 drives the first middle plate 111 to rotate relative to the rotating body 310. The second swing arm 330 is connected to the second middle plate 211, and the second swing arm 330 drives the second middle plate 211 to rotate relative to the rotating body 310.

It is understandable that when the rotating assembly 300 is in the unfolded state, the first swing arm 320 and the second swing arm 330 are in the same plane, and the first swing arm 320 and the second swing arm 330 cannot continue to rotate. When the rotating assembly 300 is in the folded state, the first swing arm 320 and the second swing arm 330 are in a mutually stacked state.

It should be noted that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the electronic device. In other embodiments of the present application, the electronic device may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently. For example, the electronic device may also include devices such as a battery, a camera (such as a front camera and a rear camera), and a flash.

Please continue to refer to Figures 3 and 4. The foldable mobile phone may also include a circuit board assembly 500. The circuit board assembly 500 includes a flexible circuit board 510 and two circuit boards (e.g., a first circuit board 520 and a second circuit board 530). The first circuit board 520 is disposed on the first middle plate 111, and the second circuit board 530 is disposed on the second middle plate 211. One end of the flexible circuit board 510 is electrically connected to the first circuit board 520, and the other end of the flexible circuit board 510 passes through the rotating assembly 300 and is electrically connected to the second circuit board 530. In other words, the flexible circuit board 510 is partially inserted into the rotating assembly 300, and the first circuit board 520 on the first middle plate 111 and the second circuit board 530 on the second middle plate 211 are connected and conducted through the flexible circuit board 510. Thus, the transmission of data between the first circuit board 520 and the second circuit board 530 is realized.

One end of the flexible circuit board 510 and the first circuit board 520 may be connected via a connector, and the other end of the flexible circuit board 510 and the second circuit board 530 may also be connected via a connector.

The flexible display screen 400 may cover the rotating assembly 300 and the circuit board assembly 500 to shield the rotating assembly 300 and the circuit board assembly 500 .

It should be noted that when the foldable phone is in the folded state, the flexible circuit board 510 is in a straightened state, in other words, the flexible circuit board 510 is in a stretched state. As the foldable phone is unfolded, the flexible circuit board 510 will perform dynamic bending motions as the foldable phone unfolds, thereby generating excessive redundancy and converting from a straightened state to a bent state.

Figures 6 and 7 show schematic diagrams of the structure of a flexible circuit board of a foldable mobile phone in the related art when it is in an unfolded state. In order to distinguish the same components in the related art and the present application, the definition of "mobile phone" is added to the names of the components in the related art. For example, the flexible circuit board 510 of the present application is the flexible circuit board 51 of the mobile phone in the related art.

6 to 8 , when the foldable mobile phone is in the unfolded state, the flexible circuit board 51 of the mobile phone generates more redundancy during the dynamic bending process compared to the stretched state, and bends to different degrees at different positions, so that the flexible circuit board 51 presents a bent state.

Compared with FIG. 6 , FIG. 7 adds three connection points, so that the mobile phone flexible circuit board 51 is bent according to a predetermined trajectory. The three connection points are respectively the connection point where the mobile phone rotating body 31 and the mobile phone flexible circuit board 51 are connected through the first connection member 60, and the connection point where the mobile phone flexible display screen 40 and the mobile phone flexible circuit board 51 are connected through two second connection members 70. Among them, the first connection member 60 can be a screw or a glue layer, and the second connection member 70 can be a glue layer.

The mobile phone flexible circuit board 51 is inserted into the mobile phone rotating body 31, and the two ends of the mobile phone flexible circuit board 51 are respectively fixed on the mobile phone first circuit board 52 and the mobile phone second circuit board 53. There are no fixed points other than the two ends of the mobile phone flexible circuit board 51 and the three connection points (such as the positions of the first connecting member 60 and the two second connecting members 70), which causes the mobile phone flexible circuit board 51 to be dynamically bent during the opening and closing process of the mobile phone flexible display screen 40, the mobile phone first shell 10, the mobile phone second shell 20 and the mobile phone rotating assembly 30 in the foldable mobile phone. Since there is no structure to constrain the shape of the mobile phone flexible circuit board 51 during the movement, the movement shape of the middle part of the mobile phone flexible circuit board 51 is unstable, and the mobile phone flexible circuit board 51 is bent to death at a certain position (such as S in FIG. 8), resulting in the mobile phone flexible circuit board 51 not moving according to the predetermined trajectory (such as the shape of the mobile phone flexible circuit board 51 shown in FIG. 6 and FIG. 7), and even causing the mobile phone flexible circuit board 51 to fail due to the bending phenomenon.

In addition, the processing tolerances of the components around the mobile phone flexible circuit board 51, the first housing 10 of the mobile phone, the second housing 20 of the mobile phone, and the processing tolerances of the mobile phone flexible circuit board 51 itself. When these processing tolerances reach their respective limit values, the superimposed tolerances generated around the mobile phone flexible circuit board 51 will also cause the mobile phone flexible circuit board 51 to fail due to the dead bending phenomenon at a certain position during the dynamic bending process.

Since the mobile phone flexible circuit board 51 and the mobile phone flexible display screen 40 are assembled together on the mobile phone first shell 10 and the mobile phone second shell 20, after the mobile phone flexible circuit board 51 fails, the mobile phone flexible display screen 40 needs to be removed first. However, in the process of removing the mobile phone flexible display screen 40, the mobile phone flexible display screen 40 is easily scrapped.

In order to avoid the scrapping of the mobile phone flexible display screen 40 due to the failure of the mobile phone flexible circuit board 51, it is necessary to avoid the possibility of the mobile phone flexible circuit board 51 failing due to the folding phenomenon during the dynamic bending process. Due to the inevitable processing tolerances of the mobile phone flexible circuit board 51 itself and the components around the mobile phone flexible circuit board 51. Therefore, it is necessary to adjust the length of the mobile phone flexible circuit board 51 (for example, the length of the mobile phone flexible circuit board 51 in the X direction in Figure 8) to absorb the redundancy generated by the mobile phone flexible circuit board 51 when the foldable mobile phone is in the unfolded state, thereby reducing the possibility of the mobile phone flexible circuit board 51 failing due to the folding phenomenon during the dynamic bending process.

To this end, an embodiment of the present application provides a circuit board structure, which can be applied to electronic devices, and the circuit board structure includes a length adjustment mechanism, which is used to adjust the length of the flexible circuit board. The length adjustment mechanism can absorb the redundancy generated by the flexible circuit board during the dynamic bending process, so that the flexible circuit board has a stable shape, thereby avoiding the flexible circuit board from being bent and failing during the dynamic bending process.

It can be understood that the circuit board structure provided in the present application can be applicable to the length adjustment of the flexible circuit board in the telescopic or sliding components of the electronic device.

The length adjustment mechanism of the present application is described below with reference to the accompanying drawings and embodiments.

As shown in FIG9 and FIG10, the circuit board structure provided by the present application is applied to electronic devices, and the electronic devices can be switched between a folded state and an unfolded state. The circuit board structure includes a flexible circuit board 510 and at least one length adjustment mechanism 540, the length adjustment mechanism 540 includes a support assembly, and the support assembly includes at least two support members 541. The flexible circuit board 510 is wound around each support member 541, and each support member 541 is respectively located on two opposite sides of the flexible circuit board 510, so that the flexible circuit board 510 is straightened by each support member 541.

At least one of the at least two supporting members 541 located on different sides of the flexible circuit board 510 moves back and forth between the opposite sides of the flexible circuit board 510 when the electronic device is switched between the folded state and the unfolded state, driving the flexible circuit board 510 to move relative to the supporting member 541, so that the length of the flexible circuit board 510 supported between the two supporting members 541 is adjustable.

In the present application, the flexible circuit board 510 is inserted into the rotating body 310 of the electronic device (hereinafter referred to as a foldable mobile phone), one end of the flexible circuit board 510 is electrically connected to the first circuit board 520, and the other end of the flexible circuit board 510 passes through the rotating body 310 and is electrically connected to the second circuit board 530. In other words, the end of the flexible circuit board 510 is located outside the rotating body 310, and the end of the flexible circuit board 510 is relatively fixed to the rotating body 310.

9 and 10 show schematic diagrams showing that the supporting members 541 on opposite sides of the flexible circuit board 510 are away from each other, and the supporting members 541 on opposite sides of the flexible circuit board 510 are away from each other to increase the length of the flexible circuit board 510 supported between the two supporting members 541. 11 and 12 show schematic diagrams showing that the supporting members 541 on opposite sides of the flexible circuit board 510 are close to each other, and the supporting members 541 on opposite sides of the flexible circuit board 510 are close to each other to reduce the length of the flexible circuit board 510 supported between the two supporting members 541.

The redundancy generated by the flexible circuit board 510 when the foldable mobile phone is in the unfolded state is generated between the end of the flexible circuit board 510 and the rotating body 310. Therefore, at least one length adjustment mechanism 540 is provided between the end of the flexible circuit board 510 and the rotating body 310, and the redundancy generated by the flexible circuit board 510 when the foldable mobile phone is in the unfolded state is absorbed by the length adjustment mechanism 540.

Specifically, the flexible circuit board 510 between the end of the flexible circuit board 510 and the rotating body 310 is wound around the support member 541. The number of the support members 541 can be two or more. The following description assumes that the number of the support members 541 is two, the two support members 541 are respectively a first support member 541a and a second support member 541b, and the first support member 541a moves relative to the second support member 541b.

As shown in FIG. 13 , the flexible circuit board 510 has a first surface 510a and a second surface 510b opposite to each other, the first support member 541a contacts the first surface 510a, and the second support member 541b contacts the second surface 510b, so that the first support member 541a and the second support member 541b are respectively supported on opposite sides of the flexible circuit board 510. When the foldable mobile phone is in a folded state, the flexible circuit board 510 is in a stretched state, and at this time, the first support member 541a and the second support member 541b are both in a first position (e.g., the position shown by the solid circle in FIG. 13 ).

When the foldable mobile phone is in the unfolded state, the flexible circuit board 510 generates more redundancy in the dynamic bending process compared to the stretched state, and the flexible circuit board 510 is bent to different degrees at different positions, so that the flexible circuit board 510 is in a bent state. The first support member 541a moves toward the second surface 510b relative to the second support member 541b (for example, the first support member 541a moves along the +Y direction in FIG. 13), and the second support member 541b remains fixed, so that the first support member 541a is in the second position (for example, the position shown by the dotted circle in FIG. 13).

When the first support member 541a is in the second position relative to the first position, the length of the flexible circuit board 510 supported between the first support member 541a and the second support member 541b increases. Under the premise that the ends of the flexible circuit board 510 remain fixed and the total length of the flexible circuit board 510 is the same, the length of the flexible circuit board 510 increased between the first support member 541a and the second support member 541b can be the partial redundancy of the flexible circuit board 510 absorbed and stored by the first support member 541a and the second support member 541b during the dynamic bending process. The present application supports the bent portion of the flexible circuit board 510 by moving the first support member 541a, thereby stretching the bent portion of the flexible circuit board 510 and absorbing and storing the partial redundancy of the flexible circuit board 510 during the dynamic bending process. In this way, the flexible circuit board 510 can maintain a stable shape, avoid the occurrence of the phenomenon of the flexible circuit board 510 being bent to death, and avoid the problem of failure due to the phenomenon of being bent to death.

When the foldable mobile phone is converted from the unfolded state shown in Figure 9 to the folded state shown in Figure 11, the first support member 541a moves along the -Y direction in Figure 13 and returns to the first position from the second position. The length of the flexible circuit board 510 supported between the first support member 541a and the second support member 541b is reduced to release the redundancy absorbed and stored by the flexible circuit board 510, so that the flexible circuit board 510 follows the folding of the foldable mobile phone and returns to its own stretched state.

In the above embodiment, the first support member 541a moves back and forth, and the second support member 541b remains fixed. It can be understood that the second support member 541b moves back and forth, and the first support member 541a remains fixed. The principle of absorbing the redundancy generated by the flexible circuit board 510 during the dynamic bending process is similar to that in the above embodiment, and the description in the above embodiment can be referred to, and will not be repeated here.

At least one first support member 541a and at least one second support member 541b both reciprocate in the horizontal direction; or, at least one first support member 541a and at least one second support member 541b both reciprocate in the vertical direction. Referring to FIG. 14 , in some embodiments, the first support member 541a and the second support member 541b can both move, and the movement directions of the first support member 541a and the second support member 541b are opposite. When the foldable mobile phone is in the folded state, the flexible circuit board 510 is in the stretched state, and the first support member 541a and the second support member 541b are in the first position (e.g., the position shown by the solid circle in FIG. 14 , or the position shown in FIG. 12 ).

When the foldable mobile phone is in the unfolded state, the first support member 541a moves along the +Y direction in FIG. 14, and the second support member 541b moves along the -Y direction in FIG. 14, so that the first support member 541a and the second support member 541b are in the second position (for example, the position shown by the dotted circle in FIG. 14, or the position shown in FIG. 10). Compared with the embodiment of FIG. 13, the first support member 541a moves back and forth, and the first support member 541a and the second support member 541b move in opposite directions at the same time in this embodiment. In this way, when the moving distance is equal, the length of the flexible circuit board 510 added between the first support member 541a and the second support member 541b is longer. Alternatively, when the length of the flexible circuit board 510 added between the first support member 541a and the second support member 541b is equal, the moving distance of the first support member 541a and the second support member 541b is smaller.

When the foldable mobile phone is converted from the unfolded state shown in Figure 9 to the folded state shown in Figure 11, the first support member 541a moves along the -Y direction in Figure 14, and the second support member 541b moves along the +Y direction in Figure 14, returning from the second position to the first position, and the length of the flexible circuit board 510 supported between the first support member 541a and the second support member 541b is reduced to release the redundancy absorbed and stored by the flexible circuit board 510, so that the flexible circuit board 510 follows the folding of the foldable mobile phone and returns to its own stretched state.

In the above embodiment, at least one of the first support member 541a and the second support member 541b is described as reciprocating along a vertical line. It is understandable that in some embodiments, at least one of the first support member 541a and the second support member 541b can also be tilted and moved, for example, the moving direction of at least one of the first support member 541a and the second support member 541b has an angle with the +Y direction in Figure 13 or Figure 14. In this way, the length of the flexible circuit board 510 supported between the two support members 541 can also be changed.

In order to absorb and store more redundancy generated during the dynamic bending of the flexible circuit board 510 , the number of the reciprocating one of the first support member 541 a and the second support member 541 b may be two or more.

Referring to FIGS. 15 and 16 , the number of the first support members 541a is two, and the number of the second support members 541b is one. In one embodiment, the number of the second support members 541b is two, and the number of the first support member 541a is one. In another embodiment, the number of the first support members 541a and the number of the second support members 541b may both be two or more. Exemplarily, as shown in FIG. 17 , when the number of the second support members 541b is two and the number of the first support members 541a is two or more, each first support member 541a may be located between two second support members 541b.

It should be noted that when there are two or more first support members 541a, as shown in Fig. 15, the moving distances of the first support members 541a may be different. As shown in Fig. 16, the moving distances of the first support members 541a may be the same.

Please continue to refer to Figures 10 and 12, the number of the first support members 541a and the number of the second support members 541b are both two or more, and the first support members 541a and the second support members 541b can be evenly spaced and arranged in sequence, wherein the first support member 541a and the second support member 541b are parallel. In this way, the force on the flexible circuit board 510 is relatively uniform, and it is also convenient to calculate the redundancy of the flexible circuit board 510 absorbed by the first support member 541a and the second support member 541b during the dynamic bending process.

It is understandable that when the number of the first support members 541a and the second support members 541b are both two or more, as shown in Figure 17, the number of the first support members 541a and the number of the second support members 541b can be the same. As shown in Figure 10, the number of the first support members 541a and the number of the second support members 541b can also be different.

In this embodiment, the first support member 541a and the second support member 541b are both rotating shafts, and the first support member 541a and the second support member 541b rotate around their own axes. When the first support member 541a and the second support member 541b reciprocate between the two opposite sides of the flexible circuit board 510, the flexible circuit board 510 drives the first support member 541a or the second support member 541b to rotate around the axis of the first support member 541a or the second support member 541b, so that the flexible circuit board 510 can move smoothly relative to the first support member 541a or the second support member 541b, reduce the friction between the flexible circuit board 510 and the first support member 541a or the second support member 541b, and avoid the first support member 541a and the second support member 541b from applying too much pulling force to the flexible circuit board 510 when reciprocating, thereby damaging the flexible circuit board 510.

It is understandable that the first support member 541a and the second support member 541b can reciprocate and rotate around their own axes. When the first support member 541a and the second support member 541b reciprocate along the vertical direction or the horizontal direction, the first support member 541a and the second support member 541b can also be called floating rotation axes.

In a specific implementation, the diameters of the first support member 541a and the second support member 541b may be the same. Thus, during installation, there is no need to distinguish between the first support member 541a and the second support member 541b. Thus, the first support member 541a and the second support member 541b are prevented from being installed in the wrong position during installation, thus saving installation time and improving installation efficiency.

Fig. 18 shows the relative positions of a portion of the flexible circuit board 510, the first support member 541a and the second support member 541b when the first support member 541a and the second support member 541b are not moved and are in the first position. Fig. 19 shows the relative positions of a portion of the flexible circuit board 510, the first support member 541a and the second support member 541b when the first support member 541a and the second support member 541b are in the first position (the position shown by the solid circle in Fig. 19) and the second position (the position shown by the dotted circle in Fig. 19).

Next, the calculation of the redundancy generated during the dynamic bending of the flexible circuit board 510 absorbed by the first support member 541a and the second support member 541b will be described with reference to FIG. 18 and FIG. 19 .

In Figures 18 and 19, _ao is the center of the first support member 541a, _bo is the center of the second support member 541b, _az is the tangent point between the flexible circuit board 510 and the first support member 541a between the first support member 541a and the second support member 541b, _bz is the tangent point between the flexible circuit board 510 and the second support member 541b between the first support member 541a and the second support member 541b, and o is the intersection of the line connecting the center _ao of the first support member 541a and the center _bo of the second support member 541b and the flexible circuit board 510.

Among them, triangle a _o a _z o and triangle b _o b _z o are right triangles, and ∠a _o a _z o and ∠b _o b _z o are both right angles.

The length L 1 of the flexible circuit board 510 between the first support member 541a and the second support member 541b when the first support member 541a and the second support member 541b are in the first position (eg, the position shown in FIG. 18 ) is calculated according to the following formulas ( _I) to (III).

L ₁ = 2 × X ₁ Formula (I)

In formula (1) to formula (3);

_L1 is the length of the flexible circuit board 510 between the first support member 541a and the second support member 541b in the first position;

_X1 is the distance between _az and o in the first position;

D ₁ is the distance between a _o and o in the first position;

R is the radius of the first support member 541a or the second support member 541b;

_M1 is the distance between the first support member 541a and the second support member 541b in the X direction when in the first position;

_N1 is the distance between the first support member 541a and the second support member 541b in the Y direction when in the first position;

After the first support member 541a and the second support member 541b are installed, the values of R, _M1 and _N1 are all fixed values, which can be obtained through the design parameters of the first support member 541a and the second support member 541b.

The length L 2 of the flexible circuit board 510 between the first support member 541a and the second support member 541b when the first support member 541a and the second support member 541b are in the second position (for example, the position of the first support member 541a and the second support member 541b indicated by the dotted circle in FIG. 19 ) is calculated according to the following formulas (iv) to (vii ₎ .

L ₂ =2×X ₂ Formula (IV)

N ₂ =N ₁ +N _a +N _b Formula (VII)

In formula (iv) to formula (vii);

_L2 is the length of the flexible circuit board 510 between the first support member 541a and the second support member 541b in the second position;

_X2 is the distance between _az and o in the second position;

D ₂ is the distance between a _o and o in the second position;

R is the radius of the first support member 541a or the second support member 541b;

_M2 is the distance between the first support member 541a and the second support member 541b in the X direction when in the second position, wherein when the first support member 541a and the second support member 541b move vertically along the +Y direction and the -Y direction in FIG. 19 , respectively, the values of _M2 and _M1 are equal;

_N2 is the distance between the first support member 541a and the second support member 541b in the Y direction when in the second position;

_N1 is the distance between the first support member 541a and the second support member 541b in the Y direction when in the first position;

N _a is the vertical movement distance of the first support member 541 a along the +Y direction in FIG. 17 when the first support member 541 a and the second support member 541 b move from the first position to the second position;

N _b is the vertical movement distance of the second support member 541 b along the -Y direction in FIG. 19 when the first support member 541 a and the second support member 541 b move from the first position to the second position;

After the first support member 541a and the second support member 541b are installed, the values of R, _M1 and _N1 are all fixed values and can be obtained through the design parameters of the first support member 541a and the second support member 541b.

_Na and _Nb are set values, and the values of _Na and _Nb can be adjusted to calculate the length L2 of the flexible circuit board 510 between the first support member 541a and the second support member 541b when the first support member 541a moves vertically along the +Y direction in FIG. 19 for different distances, and the second support member 541b moves vertically along the -Y direction in FIG. ₁₉ for different distances, corresponding to the second position.

The redundant L generated by the first support member 541a and the second support member 541b during the dynamic bending of the flexible circuit board 510 is calculated according to the following formula (VIII):

L＝L ₂ -L ₁ Formula (8)

In formula (eight), _L1 is the length of the flexible circuit board 510 between the first support member 541a and the second support member 541b when in the first position, which can be calculated by the above formulas (one) to (three);

_L2 is the length of the flexible circuit board 510 between the first support member 541a and the second support member 541b at the second position, which can be calculated by the above formula (IV) to formula (VII).

It is understandable that in the electronic device, the values of R, _M1 , _N1 , _Na and _Nb , as well as the number of the first support members 541a and the second support members 541b and the spacing therebetween can be designed by absorbing the redundancy generated by the flexible circuit board 510 during dynamic bending.

9 and 20 , in some embodiments, the support assembly further includes two third support members 541c , the flexible circuit board 510 is wound around the third support members 541c , and each first support member 541a and each second support member 541b are located between the two third support members 541c .

In the present application, the flexible circuit board 510 sequentially passes through a third support member 541c, each first support member 541a and each second support member 541b, and then passes through another third support member 541c to pass out of the support assembly. In this way, the two third support members 541c can provide a guide for the flexible circuit board 510, so as to facilitate controlling the direction of the flexible circuit board 510 passing in and out of the support assembly.

It can be understood that the third support member 541c can be parallel to the first support member 541a or the second support member 541b, and the two third support members 541c can be located in the same plane. In this way, after the flexible circuit board 510 is wound in and out of the support assembly, the flexible circuit board 510 is located in the same plane. Among them, if the first support member 541a is adjacent to the third support member 541c, the first support member 541a and the third support member 541c are respectively located on two opposite sides of the flexible circuit board 510. If the second support member 541b is adjacent to the third support member 541c, the second support member 541b and the third support member 541c are respectively located on two opposite sides of the flexible circuit board 510.

In a specific implementation, the third support member 541c is a rotation axis, and the third support member 541c rotates around its own axis, so that the flexible circuit board 510 can smoothly go in and out of the support assembly.

The diameter of the third support member 541c may be the same as the diameter of the first support member 541a or the second support member 541b.

Please continue to refer to FIG. 20 , in the present application, the length adjustment mechanism 540 further includes a housing 542, the housing 542 is disposed on the flexible circuit board 510, and the first support member 541a, the second support member 541b and the third support member 541c can all be located in the housing 542. In this way, the first support member 541a, the second support member 541b and the third support member 541c can be protected and supported by the housing 542.

It is understood that, in order to facilitate the flexible circuit board 510 to enter and exit the housing 542, the housing 542 has an entrance (not shown in the figure) and an exit (not shown in the figure) for the flexible circuit board 510 to enter and exit. The entrance and the exit are arranged opposite to each other. The entrance and the exit can be adjacent to the two third support members 541c respectively.

As shown in Figures 19 to 21, in the present application, the spacing _N2 between the first support member 541a and the second support member 541b in the Y direction in the second position can be 1.9mm-2.1mm; the spacing _M2 between the first support member 541a and the second support member 541b in the X direction in the second position can be 0.9mm-1.1mm; the width _D1 of the first support member 541a, the second support member 541b and the third support member 541c effectively supporting the flexible circuit board 510 is 19mm-21mm; the radius of the first support member 541a, the second support member 541b and the third support member 541c can be 0.4mm-0.6mm; the height _D2 of the housing 542 can be 2.9mm-3.1mm. The present application does not limit the length and width of the housing 542.

Fig. 21 is a schematic diagram of the internal structure of Fig. 20 in a top view. Referring to Fig. 9, Fig. 20 and Fig. 21, the length adjustment mechanism 540 further includes at least one driving component 543, and the driving component 543 is used to drive the support member 541 to reciprocate between the two opposite sides of the flexible circuit board 510. Thus, it is convenient to control the moving distance of the support member 541.

In some embodiments, the at least one driving component 543 includes at least one first driving component 543 a, and the first driving component 543 a is used to drive the first support member 541 a to reciprocate between two opposite sides of the flexible circuit board 510 .

In a specific implementation, the number of the first drive components 543a can be two, and the first end of each first support member 541a is connected to a first drive component 543a (as shown in FIG. 22 ), and the second end of each first support member 541a is connected to another first drive component 543a. The two first drive components 543a simultaneously drive the first support members 541a to reciprocate. In this way, the first support members 541a can be moved synchronously, and the first support members 541a move the same distance and in the same direction.

In one embodiment, the first driving components 543a and the first supporting members 541a are arranged one by one, that is, one first driving component 543a is connected to one first supporting member 541a to drive the reciprocating movement of the first supporting member 541a connected to the first driving component 543a. In this way, the moving distances and moving directions of the first supporting members 541a can be different.

In the present application, the at least one driving assembly 543 includes at least one second driving assembly 543b, and the second driving assembly 543b is used to drive the second support member 541b to reciprocate between two opposite sides of the flexible circuit board.

In a specific implementation, the number of the second drive components 543b can be two, and the first end of each second support member 541b is connected to a second drive component 543b (as shown in FIG. 23 ), and the second end of each second support member 541b is connected to another second drive component 543b. The two second drive components 543b simultaneously drive the second support members 541b to reciprocate. In this way, the second support members 541b can be moved synchronously, and the second support members 541b move the same distance and in the same direction.

In one embodiment, the second driving components 543b and the second supporting members 541b are arranged in a one-to-one correspondence, that is, one second driving component 543b is connected to one second supporting member 541b to drive the reciprocating movement of the second supporting member 541b connected to the second driving component 543b. In this way, the moving distances and moving directions of each second supporting member 541b can be different.

In the present application, the first drive assembly 543a and the second drive assembly 543b are both connected to the housing 542. The first drive assembly 543a and the second drive assembly 543b can be fixed to the housing 542 by screws, welding, or the like.

In a specific implementation, the first drive assembly 543a and the second drive assembly 543b are voice coil motors, cylinders or hydraulic cylinders. Exemplarily, the first drive assembly 543a and the second drive assembly 543b can both be floating cylinders. In some embodiments, the first drive assembly 543a and the second drive assembly 543b can also be linear motors or transmission assemblies, wherein the transmission assembly can include a transmission shaft and a gear set connected to the transmission shaft.

Referring to FIGS. 21 to 24 , in order to enable the first support member 541a and the second support member 541b to smoothly rotate around their own axes relative to the housing 542. In some embodiments, the length adjustment mechanism 540 further includes a bearing assembly 544, the bearing assembly 544 includes a plurality of bearings 5441, and both ends of the support member 541 are sleeved with bearings 5441. The bearings 5441 on the reciprocating support member 541 are connected to the driving assembly 543.

Specifically, the plurality of bearings 5441 may include at least two first bearings 5441a and at least two second bearings 5441b. A first bearing 5441a is sleeved on both ends of the first support member 541a, and a second bearing 5441b is sleeved on both ends of the second support member 541b.

In one embodiment, the inner ring of the first bearing 5441a is fixedly connected to the first support member 541a, the outer ring of the first bearing 5441a is fixedly connected to the first drive assembly 543a, the inner ring of the second bearing 5441b is fixedly connected to the second support member 541b, and the outer ring of the second bearing 5441b is fixedly connected to the second drive assembly 543b. In this way, the first drive assembly 543a and the second drive assembly 543b are directly connected to the first bearing 5441a and the second bearing 5441b, respectively. Thus, cost is saved.

In another embodiment, as shown in Figures 22 to 24, the bearing assembly 544 includes a plurality of bearing seats 5442, the bearing seats 5442 include at least two first bearing seats 5442a and two second bearing seats 5442b, the first bearing 5441a is arranged in the first bearing seat 5442a, and the first bearing 5441a is arranged in a one-to-one correspondence with the first bearing seat 5442a. The second bearing 5441b is arranged in the second bearing seat 5442b, and the second bearing 5441b is arranged in a one-to-one correspondence with the second bearing seat 5442b. Among them, as shown in Figure 22, the first bearing seat 5442a is fixedly connected to the first drive assembly 543a. As shown in Figure 23, the second bearing seat 5442b is fixedly connected to the second drive assembly 543b. That is, the first drive assembly 543a is connected to the first bearing 5441a through the first bearing seat 5442a, and the second drive assembly 543b is connected to the second bearing 5441b through the second bearing seat 5442b. Compared with directly connecting with the first bearing 5441a or the second bearing 5441b, it is more convenient to operate when connecting with the first bearing seat 5442a or the second bearing seat 5442b.

The bearing 5441 may also include at least two third bearings 5441c, and a third bearing 5441c is sleeved on both ends of the third support member 541c in FIG21. The third support member 541c is fixedly connected to the inner ring of the third bearing 5441c, and the outer ring of the third bearing 5441c is fixed relative to the housing 542. Alternatively, the third bearing 5441c may also be disposed in a third bearing seat (not shown in the figure), and the third bearing seat is fixed relative to the housing 542.

9, 20, 21, 24 and 25, in some embodiments, the length adjustment mechanism 540 further includes a guide assembly, which includes a plurality of guide rails 545, which are located in the housing 542, and the guide direction of the guide rails 545 is consistent with the moving direction of the support member 541; the reciprocating support member 541 is slidably connected to the guide rails 545. When the support member 541 reciprocates, the guide rails 545 provide guidance for the support member 541, so that the movement of the support member 541 is relatively stable.

In a specific implementation, guide rails 545 may be provided in the housing, and the guide rails 545 may be provided in pairs. The two guide rails 545 provided in a pair are respectively located on two opposite sides of the first support member 541a, and the two guide rails 545 provided in another pair are respectively located on two opposite sides of the second support member 541b. Alternatively, as shown in FIG. 25 , one guide rail 545 is shared between adjacent first support members 541a and second support members 541b.

Specifically, a pair of guide rails 545 are disposed at both ends of the first support member 541 a and the second support member 541 b , and the guide rails 545 at both ends of the first support member 541 a and the second support member 541 b are symmetrically disposed.

The bearing 5441 or the bearing seat 5442 is inserted into the guide rail 545 , or the guide rail 545 is sleeved on the bearing 5441 or the bearing seat 5442 , thereby realizing a sliding connection between the reciprocating support member 541 and the guide rail 545 .

Please continue to refer to Figures 21, 24 and 25. In addition, the length adjustment mechanism 540 also includes a limit assembly, which includes at least two limit members 546. The limit members 546 are located in the shell 542, and the limit members 546 are used to limit the moving distance of the support member 541.

The limiting member 546 may be a silicone member or a rubber member.

Referring to Figures 24 to 27, in some embodiments, the length adjustment mechanism 540 also includes an elastic component, the elastic component includes a plurality of elastic members 547, the elastic members 547 are located in the shell 542, and at least one elastic member 547 is provided between the support member 541 and the limit member 546.

Specifically, the elastic member 547 may be a spring or an elastic sleeve. One end of the elastic member 547 is fixedly connected to the bearing 5441, and the other end of the elastic member 547 is fixedly connected to the stopper 546. Alternatively, as shown in FIG. 24 , one end of the elastic member 547 is fixedly connected to the bearing seat 5442, and the other end of the elastic member 547 is fixedly connected to the stopper 546. The elastic member 547 is used to support the support member 541. When the support member 541 reciprocates, the elastic member 547 follows the reciprocating movement of the support member 541 to perform telescopic movement.

Referring to Figures 3, 4 and 28, in some embodiments, the electronic device also includes at least one fourth support member 600, the flexible circuit board 510 of the circuit board structure is wound around the fourth support member 600, and the fourth support member 600 is located between the rotating assembly 300 and the length adjustment mechanism 540 of the circuit board structure.

In the present application, a first connector 60 and two second connectors 70 are provided. The positions of the first connector 60 and the two second connectors 70, and the connection method with the flexible circuit board 510 are the same as those in the above embodiment.

At least one of the first housing 100 and the second housing 200 is connected with at least one fourth support member 600, and the fourth support member 600 can rotate around its own axis. The fourth support member 600 controls the moving direction of the flexible circuit board 510 between the rotating assembly 300 and the length adjustment mechanism 540, so that the flexible circuit board 510 can smoothly enter and exit the length adjustment mechanism 540.

The number of the fourth support members 600 may be two, and the two fourth support members 600 are respectively located on opposite sides of the rotating assembly 300. The number of the length adjustment mechanisms 540 is at least two, and the length adjustment mechanisms 540 are located between the second connecting member 70 and the fourth support member 600. Each length adjustment mechanism 540 is fixedly arranged relative to the flexible circuit board 510, wherein the housing 542 of the length adjustment mechanism 540 can be fixedly arranged on the first housing 100 or the second housing 200.

As shown in FIG. 21 and FIG. 28 , in a specific implementation, the fourth support member 600 and the third support member 541 c may be located in the same plane.

In addition, the electronic device further includes at least one shielding member 700. The number of shielding members 700 may include but is not limited to two, and the two shielding members 700 may be respectively connected to the first swing arm 320 and the second swing arm 330 in the rotating assembly 300. The shielding member 700 may be located between the rotating body 310 and the flexible display screen 400.

The above specific implementation methods further illustrate the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above are only specific implementation methods of the present application and are not used to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the present application should be included in the scope of protection of the present application.

Claims (15)

1. An electronic device, characterized in that it comprises a first housing, a second housing, a rotating assembly, a circuit board structure and a fourth support member; The first shell and the second shell are rotatably connected via the rotating assembly, the circuit board structure is arranged on the rotating assembly, and two ends of the circuit board structure are respectively connected to the first shell and the second shell; The circuit board structure includes a flexible circuit board and at least one length adjustment mechanism, the flexible circuit board is fixedly connected to the rotating assembly through a first connecting member, and at least one length adjustment mechanism is arranged between an end of the flexible circuit board and a rotating body of the rotating assembly; The length adjustment mechanism includes a support assembly, a shell and a limit assembly, the shell is inserted into the flexible circuit board, the support assembly includes at least two support members, at least two of the support members are located in the shell, the flexible circuit board located between the end of the flexible circuit board and the rotating body is wound around each of the support members, and each of the support members is respectively supported on two opposite sides of the flexible circuit board to straighten the flexible circuit board; At least one of the at least two supporting members located on different sides of the flexible circuit board reciprocates between the two opposite sides of the flexible circuit board and drives the flexible circuit board to move relative to the supporting member, so that the length of the flexible circuit board supported between the two supporting members is adjustable; The limiting assembly includes at least two limiting members, the limiting members are located in the housing, and the limiting members are used to limit the moving distance of the supporting member; The flexible circuit board is wound around the fourth support member, the fourth support member is located between the length adjustment mechanism and the rotating component, and the fourth support member can rotate around its own axis. The fourth support member is used to control the moving direction of the flexible circuit board between the rotating component and the length adjustment mechanism. 2. The electronic device according to claim 1, characterized in that the at least two supporting members include at least one first supporting member and at least one second supporting member, and the first supporting member and the second supporting member are respectively located on two opposite sides of the flexible circuit board; At least one of the first supporting members and at least one of the second supporting members reciprocate in a horizontal direction or a vertical direction, and the first supporting member moves in opposite directions to the second supporting member. 3 . The electronic device according to claim 2 , wherein the first supporting member and the second supporting member are evenly spaced apart from each other. 4 . The electronic device according to claim 2 , wherein the first support member and the second support member are both rotation axes, and the first support member and the second support member both rotate around their own axes. 5 . The electronic device according to claim 4 , wherein the diameters of the first supporting member and the second supporting member are the same. 6. The electronic device according to any one of claims 2 to 4, characterized in that the support assembly further comprises two third support members, and the flexible circuit board is wound on the third support members; Each of the first supporting members and each of the second supporting members are located between two of the third supporting members. 7 . The electronic device according to claim 6 , wherein the third support member is a rotation axis, and the third support member rotates around its own axis. 8 . The electronic device according to claim 6 , wherein the first support member, the second support member and the third support member are all located inside the housing. 9 . The electronic device according to claim 8 , wherein the length adjustment mechanism further comprises at least one driving component, and the driving component is used to drive the support member to reciprocate between two opposite sides of the flexible circuit board. 10 . The electronic device according to claim 9 , wherein the at least one driving component comprises at least one first driving component, and the first driving component is used to drive the first supporting member to reciprocate between two opposite sides of the flexible circuit board. 11 . The electronic device according to claim 10 , wherein the at least one driving component comprises at least one second driving component, and the second driving component is used to drive the second supporting member to reciprocate between two opposite sides of the flexible circuit board. 12. The electronic device according to claim 11, wherein the first driving assembly and the second driving assembly are both connected to the housing; The first driving assembly and the second driving assembly are voice coil motors, air cylinders or hydraulic cylinders. 13. The electronic device according to claim 11, characterized in that the length adjustment mechanism further comprises a bearing assembly, the bearing assembly comprises a plurality of bearings, and both ends of the support member are sleeved with the bearings; The bearing on the reciprocating support is connected to the drive assembly. 14. The electronic device according to claim 8, characterized in that the length adjustment mechanism further comprises a guide assembly, the guide assembly comprises a plurality of guide rails, the guide rails are located in the housing, and the guiding direction of the guide rails is consistent with the moving direction of the support member; The reciprocating support member is slidably connected to the guide rail. 15. The electronic device according to claim 1, characterized in that the length adjustment mechanism further comprises an elastic component, the elastic component comprises a plurality of elastic members, the elastic members are located in the housing, and at least one of the elastic members is disposed between the supporting member and the limiting member.