Multi-stable-state supporting plate, rotating shaft assembly and foldable electronic equipment

Abstract

A multi-stable support plate (260), a rotating shaft assembly (203) and a foldable electronic device (01), the multi-stable support plate can be applied to the foldable electronic device, the multi-stable support plate comprises a support part (261) and a multi-stable mechanism (262), the multi-stable mechanism is arranged on the back side of the support part, the states of the multi-stable mechanism at least comprise a first stable state and a second stable state, and the first stable state and the second stable state are different from each other. The multistable mechanism is used for switching states under the driving of the driving force so as to drive the supporting part to move; wherein when the multistable mechanism is in a first stable state, the support portion moves to a first position to support a foldable display screen (100) of the foldable electronic device, and when the multistable mechanism is in a second stable state, the support portion moves to a second position to provide a screen accommodating space to avoid the foldable display screen. The multi-stable supporting plate enables the foldable display screen to keep a good flattened state.

Description

Multi-stable support plate, rotating shaft assembly and foldable electronic device Technical Field

[0001] The present application relates to the technical field of foldable electronic devices, and in particular to a multi-stable support plate, a rotating shaft assembly, and a foldable electronic device. Background Art

[0002] In foldable electronic devices (such as foldable phones), the support mechanism is a critical component of the hinge assembly. Its primary function is to support the screen when the device is flattened and to provide space for the screen when folded. Currently, the support mechanism for foldable electronic devices is typically a floating support plate, as shown in Figure 6. The floating support plate primarily consists of a plate 231, a spring 234, and a screw 233.

[0003] 4 and 5 , the door panel swing arm B111 and the door panel swing arm B211 in the rotating shaft assembly 203 are rotatably connected to the shaft seat 210 of the rotating shaft assembly 203 and can rotate around the shaft seat 210. During the process of switching the foldable electronic device from the folded state to the flattened state, the door panel swing arm B111 and the door panel swing arm B211 rotate around the shaft seat 210 from the folded position shown in FIG5 to the flattened position shown in FIG4 . The end of the door panel swing arm B111 and the door panel swing arm B211 close to the shaft seat 210 can be rotated to the bottom of the plate body 231, thereby prying the plate body 231 in a direction away from the shaft seat 210. During this process, the spring 234 is gradually squeezed to generate an elastic force F (i.e., a reaction force). In the flattened state shown in Figure 4, the elastic force generated by the compression of the spring 234 is transmitted to the door panel swing arm B111 and the door panel swing arm B211 through the plate body 231, and acts downward on the end of the door panel swing arm B111 and the door panel swing arm B211 close to the shaft seat 210, which makes the end of the door panel swing arm B111 and the door panel swing arm B211 away from the shaft seat 210 have a tendency to move upward, which weakens the flattening and folding force of the rotating shaft assembly 203, thereby weakening the stiffness of the rotating shaft assembly 203 in the flattened state shown in Figure 4, which is not conducive to the rotating shaft assembly 203 resisting screen warping and maintaining a good flattened state in the flattened state shown in Figure 4.

[0004] Summary of the Invention

[0005] The embodiments of the present application provide a multi-stable support plate, a hinge assembly and a foldable electronic device, which can solve the problem in the prior art that the floating support plate causes the flattening and folding force of the hinge assembly to be weakened, which is not conducive to the hinge assembly resisting screen warping in the flattened state and maintaining a good flattened state.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect, a multi-stable support plate is provided. The multi-stable support plate can be applied to a foldable electronic device. The multi-stable support plate includes a support portion and a multi-stable mechanism. The multi-stable mechanism is arranged on the back side of the support portion. The state of the multi-stable mechanism includes at least a first stable state and a second stable state. The multi-stable mechanism is used to switch states under the action of a driving force to drive the support portion to move. Specifically, when the multi-stable mechanism is in the first stable state, the support portion moves to a first position to support the foldable display screen of the foldable electronic device; when the multi-stable mechanism is in the second stable state, the support portion moves to a second position to provide a screen space to avoid the foldable display screen.

[0008] It should be noted that "stable state" refers to a state of equilibrium achieved through its own stable properties without the need for external forces. In this multistable support plate, by providing a multistable mechanism having two stable states: a first stable state and a second stable state, the support portion of the multistable support plate can be stabilized in a first position by relying on the first stable state of the multistable mechanism, and in a second position by relying on the second stable state of the multistable mechanism, without the need for external forces.

[0009] When the support portion is stabilized in the first position by the multistable mechanism's first stable state, the multistable mechanism exerts no external reaction force, resulting in no force that could be transmitted to the door panel swing arm and weaken the hinge assembly's flattening and folding force. Furthermore, the hinge assembly's flattening and folding force and stiffness are actually enhanced. Specifically, driving the support portion out of the first position inevitably encounters resistance from the multistable mechanism. This is because the support portion is stabilized in the first position by the multistable mechanism's first stable state. The driving force driving the multistable mechanism out of the first stable state generates a reaction force within the multistable mechanism, creating resistance. This resistance hinders the hinge assembly's movement toward the folded state, thereby enhancing its flattening and folding force and stiffness, thereby helping the hinge assembly resist screen warping and maintain a well-flattened state. Furthermore, with the increased flattening and folding force and stiffness of the hinge assembly, the hinge assembly can be more stably maintained in the flattened state. The hinge assembly's stability in the flattened state is improved, its vibration resistance is enhanced, and it is less likely to fold under external forces.

[0010] Optionally, the multi-stable mechanism is a bistable mechanism, which includes a compliant beam; one end of the compliant beam is connected to the back side of the support part, and the other end of the compliant beam is fixed in the hinge assembly of the foldable electronic device; the compliant beam is used to deform under the driving force to drive the multi-stable mechanism to switch states.

[0011] In this embodiment, the other end of the compliant beam is fixed and cannot move, while one end of the compliant beam is movable because it is connected to the back side of the movable support portion. It should be noted that the compliant beam can be deformed by the driving force to present different forms, and different forms correspond to different states of the multi-stable mechanism. When the compliant beam is in different forms, the position of one end of the compliant beam is different, thereby driving the support portion connected to it to move to different positions. Therefore, by driving the compliant beam to deform, the multi-stable mechanism switches its state, thereby driving the support portion to move.

[0012] In some embodiments, the bistable mechanism includes two compliant beams, namely a first compliant beam and a second compliant beam; the first compliant beam and the second compliant beam are spaced apart in the width direction of the support portion. In this way, the first compliant beam and the second compliant beam are connected to the support portion at two dispersed positions in the width direction of the support portion, thereby driving the support portion to move at two dispersed positions in the width direction of the support portion. In this way, the force applied to the support portion in the width direction of the support portion is more dispersed, and the movement process of the support portion is more stable. Optionally, the first compliant beam and the second compliant beam are axially symmetrically distributed about the first center line. In this way, the force applied to the support portion in the width direction of the support portion is more uniform, and the movement process of the support portion is more stable.

[0013] In some embodiments, the bistable mechanism further includes a moving block; the moving block is located between the first compliant beam and the second compliant beam, one end of the first compliant beam and one end of the second compliant beam are respectively connected to the moving block, and the moving block is connected to the back side of the support part; the first compliant beam and the second compliant beam are respectively used to deform under the driving force to drive the moving block to move; wherein, when the moving block moves to the first stable position, the multistable mechanism is in the first stable state, and the moving block drives the support part to move to the first position; when the moving block moves to the second stable position, the multistable mechanism is in the second stable state, and the moving block drives the support part to move to the second position.

[0014] In this embodiment, one end of the first flexible beam and one end of the second flexible beam are respectively connected to the support part through a moving block. Compared with the solution in which one end of the first flexible beam and one end of the second flexible beam are directly connected to the support part, the connection with the support part through the moving block forms a face-to-face connection, the force-bearing area of ​​the support part is larger, and the movement process of the support part is more stable.

[0015] In some embodiments, the bistable mechanism further includes a first fixed block and a second fixed block distributed at intervals; the first compliant beam and the second compliant beam are located between the first fixed block and the second fixed block, the other end of the first compliant beam is connected to the first fixed block, and the other end of the second compliant beam is connected to the second fixed block, and the first fixed block and the second fixed block are used to be fixed in the rotating shaft assembly.

[0016] In this embodiment, the other end of the first flexible beam and the other end of the second flexible beam are fixed in the rotating shaft assembly by the first fixing block and the second fixing block respectively. Compared with the solution in which one end of the first flexible beam and one end of the second flexible beam are directly connected to the support part, the contact fixing area is larger during fixation and the fixation is more secure.

[0017] In some embodiments, a rigid block is provided on the compliant beam. By providing the rigid block on the compliant beam, the reaction force of the bistable mechanism can be increased, thereby further increasing the flattening and folding force and stiffness of the shaft assembly.

[0018] In some embodiments, the multistable support plate includes a plurality of multistable mechanisms; the plurality of multistable mechanisms are spaced apart and distributed along the length direction of the support portion.

[0019] In this embodiment, multiple multistable mechanisms are spaced apart along the length of the support portion. Thus, under the action of a driving force, the multiple multistable mechanisms deform, thereby driving the support portion to move at multiple locations along its length. This makes the force applied to the support portion more uniform along its length, thereby making the movement of the support portion smoother.

[0020] In some embodiments, the multistable support plate further comprises a drive mechanism disposed on the back side of the support portion; the drive mechanism comprises a first drive portion and a second drive portion. The first drive portion and the second drive portion are spaced apart in a width direction of the support portion; the first drive portion and the second drive portion are respectively configured to drive the multistable mechanism to switch states under the influence of a driving force.

[0021] In this embodiment, the first driving part and the second driving part are distributed at two dispersed positions in the width direction of the support part. In this way, when the driving force acts on the first driving part and the second driving part, the force on the support part in the width direction of the support part is more dispersed and uniform, and the movement process of the support part is more stable.

[0022] In some embodiments, the first driving part includes a first driving sub-part, a connecting part and a second driving sub-part; the first driving sub-part and the second driving sub-part are spaced apart in the thickness direction of the support part, and the second driving sub-part is farther away from the support part; the connecting part is connected between the first driving sub-part and the second driving sub-part, and forms an opening with the first driving sub-part and the second driving sub-part; the opening of the first driving part is used for allowing the first swing arm of the rotating shaft assembly to extend into the first driving part, and the opening of the second driving part is used for allowing the second swing arm of the rotating shaft assembly to extend into the second driving part, thereby providing driving force; wherein, when the driving force acts on the first driving sub-part, the first driving part and the second driving part drive the multi-stable mechanism to switch from the second stable state to the first stable state, so as to drive the support part to move from the second position to the first position; when the driving force acts on the second driving sub-part, the first driving part and the second driving part drive the multi-stable mechanism to switch from the first stable state to the second stable state, so as to drive the support part to move from the first position to the second position.

[0023] In this embodiment, the first driving portion and the second driving portion include a first driving sub-portion and a second driving sub-portion spaced apart in the thickness direction of the support portion. In this way, the direction of the driving force can be changed by acting on the first driving sub-portion and the second driving sub-portion respectively, thereby controlling the movement direction of the support portion. In this embodiment, when the driving force acts on the first driving sub-portion, the first driving portion drives the multistable mechanism to switch from the second stable state to the first stable state, thereby driving the support portion to move from the second position to the first position; when the driving force acts on the second driving sub-portion, the first driving portion drives the multistable mechanism to switch from the first stable state to the second stable state, thereby driving the support portion to move from the first position to the second position.

[0024] In some embodiments of the present application, the multi-stable support plate includes a support plate body and two driving members; the two driving members are arranged at intervals along the width direction of the support plate body and are respectively connected to the back side of the support plate body to form a first driving part and a second driving part; the support part body is also used to form a support part.

[0025] Optionally, the driving member includes a first driving area, a connecting area and a second driving area; the support plate body includes a supporting area and two third driving areas, and the two third driving areas are arranged on both sides of the width direction of the supporting area; the supporting area is used to form a supporting part; the connecting area is used to form a connecting part, and the second driving area is used to form a second driving sub-part; the first driving area and the third driving area of ​​a driving member are stacked and connected to form the first driving sub-part of the first driving part; the first driving area and the other third driving area of ​​another driving member are stacked and connected to form the first driving sub-part of the second driving part.

[0026] As an example, the support plate body is a carbon fiber board or a stainless steel sheet; the two driving components and the multi-stable mechanism are all made of metal; the two driving components and the multi-stable mechanism are respectively connected to the support plate body by plastic gluing.

[0027] Specifically, the first driving sub-section includes a first plastic layer, a third driving area, a first driving area and a second plastic layer stacked in sequence along the thickness direction of the support portion; the first driving area and the third driving area are penetrated by plastic; the plastic penetrating the first driving area and the third driving area is respectively connected to the first plastic layer and the second plastic layer.

[0028] Specifically, the moving blocks of the multi-stable mechanism are stacked on the back side of the support area; the support area and the moving blocks are penetrated by plastic, and the plastic on the front side of the support area is distributed with plastic; the plastic penetrating the support area and the moving blocks is connected with the plastic distributed on the front side of the support area.

[0029] Optionally, when the support plate body is a carbon fiber board, the plastic distributed on the front side of the support area is located in the area opposite the moving block; when the support plate body is a stainless steel sheet, the plastic distributed on the front side of the support area is spread over the upper surface of the support area.

[0030] As another example, the support plate body is a pure metal sheet; the two driving members and the multi-stable mechanism are all made of metal; the two driving members and the multi-stable mechanism are respectively connected to the support plate body by welding or sintering.

[0031] Optionally, the multi-stable mechanism includes a first side and a second side distributed in the length direction of the support part; the driving mechanism includes two groups of driving part pairs, one group of driving part pairs includes a first driving part and a second driving part; one group of driving part pairs is distributed on the first side of the multi-stable mechanism; and the other group of driving part pairs is arranged on the second side of the multi-stable mechanism.

[0032] In this embodiment, the bistable mechanism is provided with a pair of drive units on both sides of the support portion along its length. Thus, when a driving force is applied to both pairs of drive units, the bistable mechanism is driven by the force on both sides of the support portion along its length. This results in a more even force distribution across the bistable mechanism, thereby ensuring a smoother movement of the support portion driven by the bistable mechanism.

[0033] Optionally, the multi-stable support plate includes multiple sets of driving mechanisms; the multiple sets of driving mechanisms are distributed at intervals in the length direction of the support portion.

[0034] In this embodiment, the multi-stable support plate is provided with multiple sets of drive mechanisms, which are spaced apart along the length of the support portion. Thus, when a driving force acts on the multiple drive mechanisms, the four positions along the length of the support portion are driven by the driving force. This makes the force applied to the support portion more uniform along the length, thereby making the movement of the support portion smoother.

[0035] In some embodiments, the multistable support plate is an integrally formed structure. This refers to a structure in which all components of the multistable support plate are integrated, rather than being separate parts. This integrally formed structure reduces the number of parts required. When the multistable support plate is assembled onto the shaft assembly, disassembly and assembly of the multistable support plate is eliminated, simplifying the assembly process.

[0036] In a second aspect, embodiments of the present application further provide a hinge assembly. This hinge assembly can be used in a foldable electronic device. The hinge assembly includes a shaft seat, a first swing arm and a second swing arm, and a multistable support plate as described in any one of the first aspects. The first swing arm and the second swing arm are located on either side of the second centerline, and are rotatably connected to the shaft seat, respectively, so that the first swing arm and the second swing arm can rotate about the shaft seat between a flattened position and a folded position. The multistable support plate is disposed on the front side of the shaft seat. The multistable mechanism of the multistable support plate is configured to switch states under the action of a driving force provided by the first swing arm and / or the second swing arm, thereby driving the support portion of the multistable support plate to move up and down relative to the shaft seat. When the first swing arm and the second swing arm are rotated to the flattened position, the multistable mechanism is in a first stable state, and the support portion moves to the first position. When the first swing arm and the second swing arm are rotated to the folded position, the multistable mechanism is in a second stable state, and the support portion moves to the second position.

[0037] In some embodiments, the first swing arm includes a first door panel swing arm, and the second swing arm includes a second door panel swing arm; the rotating shaft assembly also includes a first door panel and a second door panel; one end of the first door panel swing arm is rotatably connected to the axle seat, and the other end of the first door panel swing arm is slidably connected to the first door panel; one end of the second door panel swing arm is rotatably connected to the axle seat, and the other end of the second door panel swing arm is slidably connected to the second door panel.

[0038] In other embodiments, the first swing arm includes a first main swing arm, and the second swing arm includes a second main swing arm; the rotating shaft assembly also includes a first connecting member and a second connecting member; one end of the first main swing arm is rotatably connected to the axle seat, and the other end of the first main swing arm is rotatably connected to the first connecting member; one end of the second main swing arm is rotatably connected to the axle seat, and the other end of the second main swing arm is rotatably connected to the second connecting member.

[0039] In other embodiments, the first swing arm includes a first auxiliary swing arm, and the second swing arm includes a second auxiliary swing arm; the rotating shaft assembly also includes a first connecting member and a second connecting member; one end of the first auxiliary swing arm is rotatably connected to the axle seat, and the other end of the first auxiliary swing arm is slidably connected to the first connecting member; one end of the second auxiliary swing arm is rotatably connected to the axle seat, and the other end of the second auxiliary swing arm is slidably connected to the second connecting member.

[0040] In other embodiments, the first swing arm includes a first damping swing arm, and the second swing arm includes a second damping swing arm; the rotating shaft assembly also includes a damping assembly, a first connecting member and a second connecting member; the first damping swing arm and the second damping swing arm are respectively connected to the damping assembly; one end of the first damping swing arm is rotatably connected to the shaft seat, and the other end of the first damping swing arm is connected to the high pair of the first connecting member; one end of the second damping swing arm is rotatably connected to the shaft seat, and the other end of the second damping swing arm is connected to the high pair of the second connecting member.

[0041] In other embodiments, the rotating shaft assembly further includes a synchronization assembly; the first damping swing arm and the second damping swing arm are connected via the synchronization assembly.

[0042] Optionally, when the first swing arm and the second swing arm rotate to the flattened position, an end of the first swing arm near the axle seat extends into the opening of the first driving part of the multistable support plate and is located between the first driving sub-part and the second driving sub-part of the first driving part, and an end of the second swing arm near the axle seat extends into the opening of the second driving part of the multistable support plate and is located between the first driving sub-part and the second driving sub-part of the second driving part; in the process of the first swing arm and the second swing arm rotating from the folded position to the flattened position, an end of the first swing arm near the axle seat contacts the first driving sub-part of the first driving part, and an end of the second swing arm near the axle seat contacts the first driving sub-part of the second driving part to provide driving force to act on the first driving sub-part; in the process of the first swing arm and the second swing arm rotating from the flattened position to the folded position, an end of the first swing arm near the axle seat contacts the second driving sub-part of the first driving part, and an end of the second swing arm near the axle seat contacts the second driving sub-part of the second driving part to provide driving force to act on the second driving sub-part.

[0043] In some possible designs, when the first swing arm and the second swing arm rotate along the first direction and rotate to a transition position between the flattened position and the folded position, the multistable mechanism is in an unstable equilibrium state, the support part moves to a third position between the first position and the second position, and the gap between the end of the first swing arm close to the axle seat and the first driving sub-part, as well as the gap between the end of the second swing arm close to the axle seat and the first driving sub-part, are both smaller than a first preset threshold; the first direction is the direction of rotation from the flattened position to the folded position.

[0044] It should be noted that when the first and second swing arms move along the first direction to the transition position, if a slight driving force is applied to the first driving sub-section of the first drive unit and the first driving sub-section of the second drive unit, the support portion will quickly move from the third position to the second position, driving the first and second drive units to move rapidly (the movement path is the above-mentioned gap), thereby causing the first driving sub-section of the first drive unit and the first driving sub-section of the second drive unit to separate from the end of the first swing arm near the shaft seat and the end of the second swing arm near the shaft seat, respectively, and causing the second driving sub-section of the first drive unit and the second driving sub-section of the second drive unit to contact the end of the first swing arm near the shaft seat and the end of the second swing arm near the shaft seat, respectively. The presence of the above-mentioned gap makes this process prone to abnormal noise. To reduce abnormal noise, in this design, the above-mentioned gap is less than a first preset threshold. In this way, the movement path of the first and second drive units is shorter, and the impact force when the second driving sub-section of the first drive unit and the second driving sub-section of the second drive unit contact the end of the first swing arm near the shaft seat and the end of the second swing arm near the shaft seat, respectively, is reduced, resulting in less abnormal noise.

[0045] In some possible designs, when the first and second swing arms rotate in the second direction and reach a transitional position between the flattened and folded positions, the multistable mechanism is in an unstable equilibrium state, the support portion moves to a third position between the first and second positions, and the gap between the end of the first swing arm near the axle seat and the second driver portion, as well as the gap between the end of the second swing arm near the axle seat and the second driver portion, are both less than a second preset threshold. The second direction is the direction of rotation from the folded position to the flattened position. This design can reduce abnormal noise during movement of the first and second swing arms in the second direction. The reasons for this can be adapted to the effect described in the previous design.

[0046] Optionally, the rotating shaft assembly includes multiple groups of swing arm pairs; wherein, one group of swing arm pairs includes a first swing arm and a second swing arm; the multiple groups of swing arm pairs are spaced apart in the length direction of the shaft seat; one group of swing arm pairs is used to drive one group of driving mechanisms among the multiple groups of driving mechanisms of the multi-stable support plate.

[0047] In this embodiment, multiple sets of swing arm pairs and multiple sets of drive mechanisms are driven in a one-to-one correspondence. Therefore, the swing arm pairs correspond in position to the drive mechanisms they drive. As can be seen from the foregoing, multiple sets of drive mechanisms are arranged on the support portion at intervals along the length of the support portion. Based on this, multiple sets of swing arm pairs are spaced apart along the length of the axle seat (i.e., the length of the support portion). In this way, multiple sets of swing arm pairs can provide driving force at four locations along the length of the support portion, which makes the force applied to the support portion along the length more uniform, thereby making the movement of the support portion smoother.

[0048] In some embodiments, the shaft seat includes a first mounting platform and a second mounting platform; the first mounting platform and the second mounting platform are located on both sides of the second center line; the first fixing block of the multi-stable mechanism is in mortise and tenon engagement with the first mounting platform, and the second fixing block of the multi-stable mechanism is in mortise and tenon engagement with the second mounting platform.

[0049] In this embodiment, the first fixing block and the first mounting platform are engaged by a mortise and tenon joint, while the second fixing block and the second mounting platform are engaged by a mortise and tenon joint, thereby securing the multistable mechanism to the shaft seat, enabling the multistable mechanism to function. This mortise and tenon joint arrangement allows the multistable mechanism to be more securely secured to the shaft seat and less susceptible to shaking, thereby increasing the connection reliability of the multistable mechanism.

[0050] As an example, the first fixing block is provided with a first protrusion extending along the thickness direction of the support part on the side facing the second fixing block; the second fixing block is provided with a second protrusion extending along the thickness direction of the support part on the side facing the first fixing block; the first mounting platform has a first notch; the table surface forming the first notch includes a first table surface facing the side where the second mounting platform is located; the first table surface has a first groove extending along the thickness direction of the shaft seat (that is, the thickness direction of the support part); the second mounting platform has a second notch, and the table surface forming the second notch includes a third table surface facing the side where the first mounting platform is located and a fourth table surface facing the side where the support part is located, and the third table surface has a second groove extending along the thickness direction of the shaft seat; the first fixing block is seated at the first notch, and the first protrusion is embedded in the first groove; the second fixing block is seated at the second notch, and the second protrusion is embedded in the second groove.

[0051] In this example, by embedding and fitting the first groove and the first protrusion extending along the thickness direction of the shaft seat, and embedding and fitting the second groove and the second protrusion extending along the thickness direction of the shaft seat, the mortise and tenon fixation of the first fixing block and the first mounting platform in the length direction of the shaft seat, and the mortise and tenon fixation of the second fixing block and the second mounting platform in the length direction of the shaft seat can be achieved.

[0052] As an example, the first mounting platform has a first notch; the table surface forming the first notch includes a second table surface facing the side where the support part is located; the second table surface has a third groove extending along the length direction of the support part; the second mounting platform has a second notch, and the table surface forming the second notch includes a fourth table surface facing the side where the support part is located, and the fourth table surface has a fourth groove extending along the length direction of the support part; the first fixing block is seated at the first notch, and the end of the first fixing block away from the support part is embedded in the third groove; the second fixing block is seated at the second notch, and the end of the second fixing block away from the support part is embedded in the fourth groove.

[0053] In this example, by fitting the third groove extending along the thickness direction of the shaft seat and the end of the first fixed block away from the support part, and fitting the fourth groove extending along the thickness direction of the shaft seat and the end of the second fixed block away from the support part, the mortise and tenon of the first fixed block and the first mounting platform in the width direction of the shaft seat, as well as the mortise and tenon of the second fixed block and the second mounting platform in the width direction of the shaft seat can be realized.

[0054] In a third aspect, embodiments of the present application further provide a foldable electronic device. The foldable electronic device includes a foldable display; a hinge assembly as described in any embodiment of the second aspect; wherein the foldable display is disposed on one side of the hinge assembly; a multistable support plate of the hinge assembly is mounted on a shaft seat of the hinge assembly, located between the shaft seat and the foldable display; and when the first and second swing arms of the hinge assembly rotate, the multistable support plate is driven to move relative to the shaft seat, thereby supporting the foldable display or providing space for the foldable display to avoid the foldable display.

[0055] It can be understood that, except for separate descriptions, the beneficial effects that can be achieved by the hinge assembly provided by any design method of the second aspect and the foldable electronic device provided by any design method of the third aspect can refer to the beneficial effects of the multi-stable support plate provided by the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] FIG1 is a schematic diagram of the three-dimensional structure of a foldable electronic device in a flattened state provided by an embodiment of the present application;

[0057] FIG2 is a schematic diagram of a planar structure of the foldable electronic device shown in FIG1 in a folded state;

[0058] FIG3 is a schematic structural diagram of a rotating shaft assembly provided in the related art in a flattened state;

[0059] FIG4 is a cross-sectional view of the rotating shaft assembly shown in FIG3 taken along the cutting line X1-X1;

[0060] FIG5 is a schematic structural diagram of the rotating shaft assembly shown in FIG4 in a folded state;

[0061] FIG6 is a schematic structural diagram of a floating support plate in the rotating shaft assembly shown in FIG3 ;

[0062] FIG7 is a schematic structural diagram of a rotating shaft assembly in a flattened state provided by an embodiment of the present application;

[0063] FIG8 is a schematic diagram of the exploded structure of the rotating shaft assembly shown in FIG7 in a flattened state;

[0064] FIG9 is an enlarged view of one of the regions P shown in FIG7 ;

[0065] FIG10 is a cross-sectional view of the shaft assembly shown in FIG7 taken along the cutting line X2-X2 shown in FIG9;

[0066] FIG11 is a schematic structural diagram of the rotating shaft assembly shown in FIG10 in a folded state;

[0067] FIG12 is a schematic structural diagram of the connection portion between the door panel swing arm and the axle seat shown in FIG8;

[0068] FIG13 is a schematic structural diagram of the connection portion between the main swing arm and the axle seat shown in FIG8 ;

[0069] FIG14 is a schematic structural diagram of a bistable support plate provided in an embodiment of the present application;

[0070] FIG15 is an enlarged view of one of the regions Q shown in FIG14 ;

[0071] FIG16 is a schematic diagram of the installation of a bistable support plate and an axle seat provided in an embodiment of the present application;

[0072] FIG17 is a schematic diagram of a compliant bistable mechanism provided in an embodiment of the present application;

[0073] FIG18 is a comparison diagram of characteristic curves of reaction force f and displacement s of a bistable mechanism provided in an embodiment of the present application;

[0074] FIG19 is a schematic structural diagram of three other bistable mechanisms provided in an embodiment of the present application;

[0075] FIG20 is a cross-sectional view of the shaft assembly shown in FIG7 taken along the cutting line X3-X3 shown in FIG9;

[0076] FIG21 is a schematic structural diagram of the rotating shaft assembly shown in FIG20 in a folded state;

[0077] FIG22 is a schematic diagram showing a first embodiment of a rotating shaft assembly provided by the present application, wherein the rotating shaft assembly moves from a flattened state to an intermediate state and then to a folded state;

[0078] FIG23 is a second schematic diagram of a movement from a flattened state to an intermediate state and to a folded state according to an embodiment of the present application;

[0079] FIG24 is a schematic diagram showing a first embodiment of a rotating shaft assembly provided by the present application, wherein the rotating shaft assembly moves from a folded state to an intermediate state and then to a flattened state;

[0080] FIG25 is a second schematic diagram of a change from a folded state to an intermediate state to a flattened state according to an embodiment of the present application;

[0081] FIG26 is a schematic structural diagram of a rotating shaft assembly in an intermediate state provided by an embodiment of the present application;

[0082] FIG27 is a schematic diagram of the three-dimensional structure of the rotating shaft assembly shown in FIG7 taken along the section line X3-X3 shown in FIG9;

[0083] FIG28 is an exploded schematic diagram of a bistable support plate provided in an embodiment of the present application;

[0084] FIG29 is a schematic structural diagram of the connection between the support plate body and the first shifting claw provided in some embodiments of the present application;

[0085] FIG30 is a cross-sectional view taken along the cutting line Y1-Y1 shown in FIG29;

[0086] FIG31 is a schematic diagram of the structure of the bistable mechanism, the first shifter claw, and the second shifter claw in FIG28 after being turned over;

[0087] FIG32 is a schematic structural diagram of the connection between the support plate body and the first shifting claw provided in other embodiments of the present application;

[0088] FIG33 is a cross-sectional view taken along the cutting line Y2-Y2 shown in FIG32;

[0089] FIG34 is a schematic diagram of the structure of the connection between the support plate body and the first claw, the second claw, and the bistable mechanism according to some embodiments of the present application;

[0090] FIG35 is a schematic structural diagram of the connection between the support plate body and the first shifter claw, the second shifter claw, and the bistable mechanism provided in other embodiments of the present application.

[0091] Figure 36 is a schematic diagram of the assembly process of the bistable support plate provided in an embodiment of the present application. DETAILED DESCRIPTION

[0092] In order to make the purpose, technical solutions and advantages of this application clearer, this application will be further described in detail below with reference to the accompanying drawings.

[0093] Hereinafter, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified with "first," "second," etc., may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0094] In addition, in this application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to changes in the orientation of the components in the drawings.

[0095] The embodiments of the present application provide a foldable electronic device. The foldable electronic device is an electronic device that can fold a display screen, and the folding function of the display screen is achieved by a hinge assembly. For example, the foldable electronic device can be a mobile phone, a display, a tablet computer, a car computer, a desktop computer, a laptop computer, a handheld computer, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a cellular phone, a personal digital assistant (PDA), and other devices with a display screen. The embodiments of the present application do not impose any special restrictions on the specific form of the above-mentioned foldable electronic device. The following embodiments are described using the foldable electronic device as an example of a mobile phone.

[0096] Please refer to FIG. 1 , which is a schematic diagram of the three-dimensional structure of a foldable electronic device in a flattened state provided by an embodiment of the present application.

[0097] When flattened, the foldable electronic device 01 is approximately rectangular and flat. To facilitate the description of the various embodiments below, an XYZ coordinate system is established for the foldable electronic device 01 in the flattened state, where the X-axis is the length of the foldable electronic device 01; the Y-axis is the width of the foldable electronic device 01; and the Z-axis is the thickness of the foldable electronic device 01. It is understood that the coordinate system of the foldable electronic device 01 can be flexibly configured according to actual needs and is not specifically limited here. In other embodiments, the foldable electronic device 01 may also be in the shape of a square and flat plate, etc.

[0098] The foldable electronic device 01 includes a foldable display screen 100 and a support assembly 200 .

[0099] First, the foldable display screen 100 is exemplarily described.

[0100] The foldable display screen 100 is used to display information such as images and videos. The foldable display screen 100 is a display screen with a bendable property, so that the foldable display screen 100 can be folded from the flat state shown in FIG1 to the folded state shown in FIG2 .

[0101] The foldable display screen 100 includes a first display area 110, a second display area 120, and a third display area 130. The third display area 130 is connected between the first display area 110 and the second display area 120. In the flattened state of the foldable electronic device 01 shown in FIG1 , the foldable display screen 100 is also flattened, with the first display area 110, the third display area 130, and the second display area 120 arranged sequentially along the X-axis, such that the foldable electronic device 01 folds in the horizontal direction. Of course, in other embodiments, when the foldable display screen 100 is flattened, the first display area 110, the third display area 130, and the second display area 120 may also be arranged sequentially along the Y-axis, such that the foldable electronic device 01 folds in the vertical direction.

[0102] Among the three display areas, at least the third display area 130 is a flexible structure. In this way, the third display area 130 can be bent under the action of external force, so that the foldable display screen 100 has a bendable property to support the foldable display screen 100 to switch between the flattened state shown in Figure 1 and the folded state shown in Figure 2.

[0103] Exemplarily, the foldable display screen 100 is a flexible structure throughout, i.e., the first display area 110, the second display area 120, and the third display area 130 are all flexible structures. For example, when the foldable display screen 100 is an active matrix organic light emitting diode (AMOLED) display screen, since the AMOLED display screen is a self-luminous display screen and does not require a backlight module (BLM), when the base substrate of the AMOLED display screen is made of a flexible resin material, such as polyethylene terephthalate (PET), the AMOLED display screen can be bendable, thereby forming a flexible structure throughout.

[0104] Exemplarily, only the third display area 130 is a flexible structure, while the first display area 110 and the second display area 120 are rigid structures.

[0105] It should be understood that when the foldable electronic device 01 is in the flattened state shown in Figure 1, the foldable display screen 100 is also in the flattened state shown in Figure 1, thereby enabling large-screen display to provide users with richer information and bring users a better user experience.

[0106] Next, the support assembly 200 is exemplarily described.

[0107] The support assembly 200 is used to support the foldable display 100. The foldable display 100 is disposed on one side of the support assembly 200. Specifically, the support assembly 200 includes a first housing 201, a second housing 202, and a hinge assembly 203. When the foldable electronic device 01 is in the flattened state shown in Figure 1, the first housing 201, the hinge assembly 203, and the second housing 202 are arranged in sequence along the X-axis direction, and their upper surfaces (the surface facing the foldable display 100) are roughly flush. The first housing 201 supports the first display area 110, the second housing 202 supports the second display area 120, and the hinge assembly 203 is connected between the first housing 201 and the second housing 202, supporting the third display area 130.

[0108] During the specific implementation process, the first shell 201 and the second shell 202 can be the middle frame of the foldable electronic device 01, or the back shell of the foldable electronic device 01, or a structure assembled of the middle frame and the back shell.

[0109] The hinge assembly 203 can realize the rotation of the first shell 201 and the second shell 202. The foldable display screen 100 is set on the first shell 201, the second shell 202 and the hinge assembly 203, and can be folded or unfolded as the first shell 201 and the second shell 202 rotate, thereby switching between the flattened state shown in Figure 1 and the folded state shown in Figure 2.

[0110] Please refer to FIG. 2 , which is a schematic diagram of the planar structure of the foldable electronic device shown in FIG. 1 in a folded state.

[0111] When the foldable electronic device 01 shown in FIG. 2 is in the folded state, the foldable display screen 100 is also in the folded state.

[0112] Specifically, the first display area 110 and the second display area 120 of the foldable display 100 are substantially parallel and opposite to each other. The phrase "the first display area 110 and the second display area 120 are substantially parallel" means that the angle between the first display area 110 and the second display area 120 is not necessarily 0°, but rather approaches 0°, and can be, for example, less than a certain angle (e.g., 15°). The phrase "the first display area 110 and the second display area 120 are opposite to each other" means that the display surface of the first display area 110 and the display surface of the second display area 120 are opposite to each other.

[0113] The third display area 130 of the foldable display 100 is folded into a teardrop shape. In this configuration, the third display area 130 includes a first bending area 131, a second bending area 132, and a third bending area 133. The first bending area 131 connects between the third bending area 133 and the first display area 110, and the second bending area 132 connects between the third bending area 133 and the second display area 120. The distance between the end of the first bending area 131 connecting to the first display area 110 and the end of the second bending area 132 connecting to the second display area 120 is a first distance, while the distance between the end of the first bending area 131 connecting to the third bending area 133 and the end of the second bending area 132 connecting to the third bending area 133 is a second distance. This second distance is greater than the first distance, thereby forming the teardrop shape of the third display area 130 and extending the life of the foldable display 100. It is understandable that the third display area 130 can also be folded into other shapes, such as a "U" shape, and this application does not limit this.

[0114] To achieve the folding function of the foldable electronic device 01, the hinge assembly 203 can be used to achieve relative rotation between the first housing 201 and the second housing 202. When the foldable electronic device 01 switches from the flattened state shown in Figure 1 to the folded state shown in Figure 2, the first housing 201 and the second housing 202 rotate relative to each other, thereby driving the foldable display 100 to fold, so that the foldable display 100 switches from the flattened state shown in Figure 1 to the folded state shown in Figure 2. When the foldable electronic device 01 switches from the folded state shown in Figure 2 to the flattened state shown in Figure 1, the first housing 201 and the second housing 202 rotate relative to each other, thereby driving the foldable display 100 to unfold, so that the foldable display 100 switches from the folded state shown in Figure 2 to the flattened state shown in Figure 1.

[0115] As shown in Figure 1, when the first shell 201 and the second shell 202 are rotated to an angle of approximately 180°, the first shell 201 and the second shell 202 are flattened, and the foldable display 100 is in a flattened state. In this case, the hinge assembly 203 supports the third display area 130 to support the flattening of the foldable display 100.

[0116] As shown in Figure 2, when the first shell 201 and the second shell 202 are rotated to an angle of approximately 0°, the first shell 201 and the second shell 202 are combined together, and the foldable display 100 is in a folded state. In this case, the hinge assembly 203 provides screen space to avoid the third display area 130 to support the folding of the foldable display 100.

[0117] It is worth noting that the foldable electronic device 01 shown in FIG2 is an inward-folding electronic device. That is, in the folded state, the foldable display 100 is located inside the support assembly 200. This makes the foldable display 100 invisible to the user and prevents scratches on the foldable display 100. Furthermore, it should be understood that when the foldable electronic device 01 is in the folded state, the size of the foldable electronic device 01 can be reduced, making it easier to carry.

[0118] Please refer to Figures 3 to 5. Figure 3 is a schematic diagram of the structure of a rotating shaft assembly provided in the related art in a flattened state; Figure 4 is a cross-sectional view of the rotating shaft assembly shown in Figure 3 taken along the cutting line X1-X1; and Figure 5 is a schematic diagram of the structure of the rotating shaft assembly shown in Figure 4 in a folded state. It should be noted that Figure 5 can be understood as a cross-sectional view of the rotating shaft assembly 203 shown in Figure 3 in the folded state taken along the cutting line at the same position as the cutting line X1-X1.

[0119] It should be understood that the hinge assembly 203 shown in Figures 3 to 5 can be applied to the foldable electronic device 01 shown in Figures 1 and 2. It should be noted that the flattened state of the hinge assembly 203 shown in Figures 3 and 4 can be understood as the state of the hinge assembly 203 when the foldable electronic device 01 is in the flattened state shown in Figure 1; the folded state of the hinge assembly 203 shown in Figure 5 can be understood as the state of the hinge assembly 203 when the foldable electronic device 01 is in the folded state shown in Figure 2. For ease of understanding and explanation, Figures 4 and 5 also show the third display area 130.

[0120] As can be seen in Figures 4 and 5 , in the rotating shaft assembly 203, the door panel swing arm B111 and the door panel swing arm B211 are respectively located on either side of the center line O11 of the shaft base 210. The center line O11 is a reference line that passes through the center O1 of the shaft base 210 in the X-axis direction and extends along the Z-axis. The door panel swing arm B111 and the door panel swing arm B211 are respectively rotatably connected to the shaft base 210 and can rotate around the shaft base 210. As the foldable electronic device switches between the folded state and the flattened state, the door panel swing arm B111 and the door panel swing arm B211 rotate around the shaft base 210 between the folded position shown in Figure 5 and the flattened position shown in Figure 4.

[0121] During the rotation of the door panel swing arms B111 and B211 around the shaft seat 210, the floating support plate 230 can move up and down relative to the shaft seat 210, driven by the door panel swing arms B111 and B211. The upward movement of the floating support plate 230 relative to the shaft seat 210 refers to the floating support plate 230 moving away from the shaft seat 210, i.e., the positive direction of the Z-axis in the figure; the downward movement of the floating support plate 230 relative to the shaft seat 210 refers to the floating support plate 230 moving toward the shaft seat 210, i.e., the negative direction of the Z-axis in the figure. It should be noted that the floating support plate 230 can move up and down relative to the shaft seat 210 along the Z-axis direction, and the direction of the floating support plate 230's upward and downward movement relative to the shaft seat 210 can also be inclined to a certain extent relative to the Z-axis direction. It should be understood that the Z-axis direction is the thickness direction of the floating support plate 230, and is also the direction perpendicular to the plate surface of the floating support plate 230.

[0122] Specifically, when the foldable electronic device switches from a folded state to an unfolded state, the first swing arm B1 and the second swing arm B2 rotate around the shaft seat 210 from the folded position shown in Figure 5 to the unfolded position shown in Figure 4, and the floating support plate 230 moves upward from the avoidance position shown in Figure 5 to the supporting position shown in Figure 4 relative to the shaft seat 210, so as to support the third display area 130 in the unfolded state shown in Figure 4; when the foldable electronic device switches from a flat state to a folded state, the first swing arm B1 and the second swing arm B2 rotate around the shaft seat 210 from the flat position shown in Figure 4 to the folded position shown in Figure 5, and the floating support plate 230 moves downward from the supporting position shown in Figure 4 to the avoidance position shown in Figure 5 relative to the shaft seat 210, so as to provide screen space to avoid the third display area 130 in the folded state shown in Figure 5.

[0123] In order to enable the floating support plate 230 to move up and down relative to the shaft seat 210, please refer to Figure 6, which is a structural diagram of the floating support plate 230 in the rotating shaft assembly 203 shown in Figure 3. The figure also magnifies the area N1.

[0124] As shown in Figure 6, the floating support plate 230 includes a plate body 231, an extension 232, a screw 233, and a spring 234. The extension 232 is located on the back side of the plate body 231 and extends away from the plate body 231. The screw 233 is threadedly connected to the end of the extension 232 away from the plate body 231. The spring 234 is connected to the nut of the screw 233 and is mounted around the outer periphery of the extension 232.

[0125] When the floating support plate 230 is used in the rotating shaft assembly 203 shown in Figures 4 and 5, the floating support plate 230 is movably fixed to the shaft seat 210 via screws 233 to ensure that the floating support plate 230 can move up and down relative to the shaft seat 210. In addition, the floating support plate 230 is driven to move by the cooperation of the spring 234, the door panel swing arm B111, and the door panel swing arm B211.

[0126] Specifically, please continue to refer to Figures 4 and 5. The shaft seat 210 has a groove 211 and a groove 212. The opening of the groove 211 faces the third display area 130, and the opening of the groove 212 faces the shaft cover 220. The groove 211 and the groove 212 are connected by a through hole 213.

[0127] When the floating support plate 230 shown in Figure 6 is installed on the shaft seat 210 of the rotating shaft assembly 203 shown in Figures 4 and 5, the following assembly process is involved: first, the screw 233 of the floating support plate 230 shown in Figure 6 is removed from the extension portion 232; secondly, the plate body 231 is placed in the groove 211 shown in Figure 4, and the extension portion 232 is passed through the through hole 213; then the screw rod of the screw 233 is passed through the through hole 213 from the open side of the groove 212; then the screw 233 is screwed so that the screw rod of the screw 233 is threadedly connected to the extension portion 232 of the floating support plate 230 located in the groove 211, thereby completing the assembly.

[0128] Continuing with Figures 4 and 5 , due to the size of screw 233's nut and spring 234 (e.g., the radial dimensions of screw 233's nut and spring 234 are larger than the diameter of through-hole 213), screw 233's nut and spring 234 are constrained within groove 212, with spring 234 abutting between the bottom of groove 212 and screw 233's nut. The shank of screw 233 extends from groove 212 through through-hole 213 into groove 211, where it is threadedly engaged with extension portion 232 of floating support plate 230 located within groove 211. As can be seen, screw 233 itself is not fixed to shaft seat 210, allowing screw 233 to move up and down relative to shaft seat 210, thereby supporting the up and down movement of floating support plate 230 relative to shaft seat 210. When the floating support plate 230 moves upward relative to the shaft seat 210, the screw 233 follows the upward movement, which causes the spring 234 located between the bottom of the groove 212 and the nut of the screw 233 to be squeezed to generate an elastic force (i.e., a reaction force); when the floating support plate 230 can move downward relative to the shaft seat 210, the screw 233 follows the downward movement, which causes the squeezed spring 234 to gradually recover.

[0129] Specifically, when the door panel swing arm B111 and the door panel swing arm B211 rotate from the folded position shown in FIG. 5 to the flattened position shown in FIG. 4 , the second end of the door panel swing arm B111 and the second end of the door panel swing arm B211 gradually rotate to below the plate body 231 and gradually contact the lower surface of the plate body 231, thereby prying the plate body 231 and causing it to move upward. When the door panel swing arm B111 and the door panel swing arm B211 rotate to the flattened position shown in FIG. 4 , the second end of the door panel swing arm B111 and the second end of the door panel swing arm B211 are supported below the plate body 231, providing a supporting force to support the plate body 231 so that it remains in the supporting position, thereby supporting the third display area 130. It should be understood that as the plate body 231 moves upward, the downward elastic force F generated by the compression of the spring 234 becomes larger and larger. Finally, the elastic force F of the spring 234 is equivalent to the supporting force of the two door panel swing arms, and the elastic force F reaches the maximum. The plate body 231 is maintained in the supported position under the interaction of the spring 234 and the two door panel swing arms.

[0130] As the door panel swing arms B111 and B211 rotate from the flattened position shown in FIG. 4 to the folded position shown in FIG. 5 , the second ends of the door panel swing arms B111 and B211 gradually withdraw from under the plate body 231. As a result, the plate body 231 gradually loses support from the door panel swing arms B111 and B211 and moves downward under the force F generated by the compression of the spring 234. When the door panel swing arms B111 and B211 rotate to the folded position shown in FIG. 5 , the plate body 231 moves to a clearance position, thereby providing space to clear the second bending zone 132. It should be understood that as the plate body 231 moves downward, the downward force F generated by the compression of the spring 234 decreases. When the force F of the spring 234 reaches zero, the plate body 231 remains in the clearance position.

[0131] 4 , the floating support plate 230 requires the support of the door panel swing arms B111 and B211 to maintain its support position and support the third display area 130. Once the door panel swing arms B111 and B211 are removed, the floating support plate 230 will automatically move to the avoidance position under the action of the elastic force F.

[0132] In addition, in the flattened state shown in Figure 4, the elastic force F generated by the compression of the spring 234 is transmitted to the door panel swing arm B111 and the door panel swing arm B211 through the plate body 231, and acts downward on the second end of the door panel swing arm B111 and the second end of the door panel swing arm B211, so that the first end of the door panel swing arm B111 and the first end of the door panel swing arm B211 have a tendency to move upward (indicated by the dotted arrow in the figure), which weakens the flattening and folding force of the rotating shaft assembly 203.

[0133] The flattening and folding force of the hinge assembly 203 refers to the resistance that the hinge assembly 203 must overcome when folding back from the flattened state. This flattening and folding force can be understood as the force used by the hinge assembly 203 to resist screen warping caused by bending in the flattened state. Therefore, as the flattening and folding force of the hinge assembly 203 is weakened, the stiffness of the hinge assembly 203 in the flattened state shown in Figure 4 is weakened, which is not conducive to the hinge assembly 203 resisting screen warping and maintaining a good flat state in the flattened state.

[0134] In order to solve the problems existing in the rotating shaft assembly 203 shown in Figures 4 and 5 above, an embodiment of the present application provides a rotating shaft assembly 203.

[0135] For example, please refer to Figure 7, which is a schematic diagram of the structure of a hinge assembly 203 in a flattened state provided in an embodiment of the present application. It should be understood that the hinge assembly 203 shown in Figure 7 can be used in the foldable electronic device 01 shown in Figures 1 and 2. The flattened state of the hinge assembly 203 shown in Figure 7 can be understood as the state of the hinge assembly 203 when the foldable electronic device 01 is in the flattened state shown in Figure 1.

[0136] The rotating shaft assembly 203 includes a first swing arm B1 and a second swing arm B2, a first door panel A1 and a second door panel A2, a multi-stable support plate 260, and an axle seat located below the multi-stable support plate 260 (obscured by the multi-stable support plate 260 in the figure). It should be understood that the rotating shaft assembly 203 may also include more components than shown in the figure, and this embodiment of the application is not limited to this.

[0137] The first swing arm B1 and the second swing arm B2 are each disposed on either side of the shaft seat in the X-axis direction and are rotatably connected to the shaft seat, such that the first swing arm B1 and the second swing arm B2 can respectively rotate relative to the shaft seat. It should be noted that a rotational connection refers to a connection method that enables relative rotation between two connected components, including but not limited to methods such as physical or virtual axes. The details of achieving rotational connection via physical or virtual axes will be discussed in detail later when introducing various types of swing arms. This can be readily understood by reference and will not be further described here.

[0138] The multi-stable support plate 260 is mounted on the shaft seat 210 in a relatively movable manner so that the multi-stable support plate 260 can move up and down relative to the shaft seat. The meaning and specific implementation of the multi-stable support plate 260 moving up and down relative to the shaft seat can refer to the relevant content of the floating support plate 230 mentioned above.

[0139] In the embodiment of the present application, the multi-stable support plate 260 is driven by the first swing arm B1 and the second swing arm B2. Specifically, when the foldable electronic device switches from the flat state to the folded state, the first swing arm B1 and the second swing arm B2 rotate toward each other, driving the multi-stable support plate 260 downward relative to the axle base. When the foldable electronic device switches from the folded state to the flat state, the first swing arm B1 and the second swing arm B2 rotate away from each other, driving the multi-stable support plate 260 upward relative to the axle base.

[0140] It should be noted that the first swing arm B1 and the second swing arm B2 can be any of a variety of types of swing arms that can rotate relative to the axle seat, for example, they can be a main swing arm, an auxiliary swing arm, a damping swing arm, etc. The following first describes various embodiments of the first swing arm B1 and the second swing arm B2 with reference to Figures 8 to 13 .

[0141] Please refer to FIG. 7 and FIG. 8 . FIG. 8 is a schematic diagram of the exploded structure of the rotating shaft assembly 203 shown in FIG. 7 in a flattened state.

[0142] The rotating shaft assembly 203 includes an axle seat 210, a shaft cover 220, a multi-stable support plate 260, a door panel assembly A, a door panel swing arm assembly B01, a main swing arm assembly B02, a secondary swing arm assembly B03, a damping swing arm assembly B04, and a connecting assembly C. It should be understood that the rotating shaft assembly 203 may include more components than shown, and this embodiment of the present application is not limited to this. The following describes the location, connection relationship, and function of each component.

[0143] The shaft base 210 serves as a base for mounting the moving components of the shaft assembly 203. For example, the moving components may include the aforementioned multistable support plate 260, the door panel swing arm assembly B01, the main swing arm assembly B02, the auxiliary swing arm assembly B03, the damping swing arm assembly B04, and so on. The shaft base 210 is fixedly mounted on the shaft cover 220. In a specific implementation, the shaft base 210 may be a single integral component or multiple independent components. For example, in Figure 8, the shaft base 210 includes multiple bases distributed along the Y-axis, such as base 210a, base 210b, and base 210c.

[0144] The multistable support plate 260 and the shaft cover 220 are each located on opposite sides of the shaft seat 210 in the Z-axis direction. It should be understood that the Z-axis direction is the thickness direction of the shaft seat 210. For ease of understanding, the side where the multistable support plate 260 is located will be referred to as the front side of the shaft seat 210, and the side where the shaft cover 220 is located will be referred to as the back side of the shaft seat 210. In this case, the multistable support plate 260 is arranged on the front side of the shaft seat 210, and the shaft cover 220 is arranged on the back side of the shaft seat 210. It should be understood that the front side of the shaft seat 210 is the side of the shaft seat 210 facing the third display area 130, and the back side of the shaft seat 210 is the side of the shaft seat 210 facing away from the third display area 130. The meanings of the back side and the front side of other components mentioned later can be understood by reference and will not be repeated here.

[0145] The shaft cover 220 serves as an appearance part of the hinge assembly 203 and is used to cover the shaft seat 210 in the hinge assembly 203 and the moving parts arranged on the shaft seat 210 to ensure the aesthetic effect of the foldable electronic device 01.

[0146] The connection assembly C includes three groups of connector pairs spaced apart along the Y-axis direction of the shaft seat 210, namely, connector pair C01, connector pair C02, and connector pair C03. Among them, one connector pair includes a first connector and a second connector. For ease of distinction, the first connector and the second connector included in connector pair C01 will be referred to as connectors C11 and C21, the first connector and the second connector included in connector pair C02 will be referred to as connectors C12 and C22, and the first connector and the second connector included in connector pair C03 will be referred to as connectors C13 and C23. The following description will take connectors C11 and C21 included in connector pair C01 as an example, and other connector pairs can be implemented accordingly.

[0147] The connector C11 and connector C21 included in the connector pair C01 are each located on opposite sides of the shaft seat 210 in the X-axis direction. In Figure 8, the connector C11 and connector C21 are mirror-symmetrical in the X-axis direction. Of course, in other embodiments, they may not be mirror-symmetrical. It should be understood that the X-axis direction is the width direction of the shaft seat 210. For ease of understanding and explanation, the side where the connector C11 is located will be referred to as the left side of the shaft seat 210, and the side where the connector C21 is located will be referred to as the right side of the shaft seat 210. It should be understood that the left side of the shaft seat 210 faces the first housing 201, and the right side of the shaft seat 210 faces the second housing 202. The meanings of the left and right sides of other components mentioned later can be understood by reference and will not be repeated here.

[0148] The connector C11 on the left side of the shaft seat 210 is used to be fixedly connected to the aforementioned first housing 201, and the connector C21 on the right side of the shaft seat 210 is used to be fixedly connected to the aforementioned second housing 202. In this way, when the first housing 201 and the second housing 202 rotate relative to each other, the connectors C11 and C21 on both sides of the shaft seat 210 are respectively driven to rotate relative to each other; when the first housing 201 and the second housing 202 rotate relative to each other, the connectors C11 and C21 on both sides of the shaft seat 210 are respectively driven to rotate relative to each other.

[0149] Optionally, the connector C11 and the first shell 201 can be separately formed and connected, for example, they can be connected by fasteners (such as bolts, screws, pins, rivets, etc.); of course, in some other embodiments, the connector C11 and the first shell 201 can also be an integrally formed one-piece structure. Similarly, the connector C21 and the second shell 202 can be separately formed and connected, or they can be an integrally formed one-piece structure. The connector C11 and the connector C21 can be various structural members of regular or irregular shapes, for example, they can be block structures, plate structures, frame structures, etc., but are not limited to these. It should be understood that the first connector and the second connector of the remaining connector pairs are also fixedly connected to the first shell 201 and the second shell 202 respectively, and the fixed connection method and movement principle can refer to the connector C11 and the connector C21.

[0150] The door panel assembly A includes a first door panel A1 and a second door panel A2. The first and second door panels A1 and A2 are each located on opposite sides of the axle base 210 in the X-axis direction. The first and second door panels A1 and A2 are mirror-symmetrical in the X-axis direction. In other embodiments, these may not be mirror-symmetrical. The first door panel A1 is located between the left side of the axle base 210 and the first connecting member, while the second door panel A2 is located between the right side of the axle base 210 and the second connecting member. One end of the first door panel A1 is rotatably connected to the first connecting member; one end of the second door panel A2 is rotatably connected to the second connecting member. In this way, when the first connecting member and the second connecting member rotate relative to each other, they respectively drive the first door panel A1 and the second door panel A2 located on both sides of the shaft seat 210 to rotate relative to each other, driving the first bending area 131 and the second bending area 132 of the third display area 130 shown in Figure 2 to move relative to each other, thereby realizing the bending of the third display area 130; when the first connecting member and the second connecting member rotate relative to each other, they respectively drive the first door panel A1 and the second door panel A2 located on both sides of the shaft seat 210 to rotate relative to each other, driving the first bending area 131 and the second bending area 132 of the third display area 130 shown in Figure 2 to move relative to each other, thereby realizing the expansion of the third display area 130.

[0151] Please refer to Figures 9 to 11. Figure 10 is a cross-sectional view of the rotating shaft assembly shown in Figure 7 taken along the section line X2-X2 shown in Figure 9; Figure 11 is a schematic structural diagram of the rotating shaft assembly shown in Figure 10 in the folded state. It should be noted that Figure 11 can be understood as a cross-sectional view of the rotating shaft assembly 203 shown in Figure 9 in the folded state taken along the section line at the same position as the section line X2-X2. It should be noted that four regions P are outlined in four dotted boxes in Figure 7, and Figure 9 is an enlarged view of one of the regions P shown in Figure 7 (region P1).

[0152] It should be understood that the hinge assembly 203 shown in Figures 10 and 11 can be applied to the foldable electronic device 01 shown in Figures 1 and 2. It should be noted that the flattened state of the hinge assembly 203 shown in Figure 10 can be understood as the state of the hinge assembly 203 when the foldable electronic device 01 is in the flattened state shown in Figure 1; the folded state of the hinge assembly 203 shown in Figure 11 can be understood as the state of the hinge assembly 203 when the foldable electronic device 01 is in the folded state shown in Figure 2. For ease of understanding and explanation, Figures 10 and 11 also illustrate the third display area 130.

[0153] As shown in Figure 10, when the hinge assembly 203 is in the flattened state, the first door panel A1 and the second door panel A2 are rotated to the left and right sides of the shaft seat 210, respectively, as shown in Figure 10, with the first door panel A1 and the second door panel A2 being approximately 180° apart. In this state, the first bending area 131, the third bending area 133, and the second bending area 132 are arranged sequentially in the X-axis direction, approximately 180° apart, indicating that the third display area 130 is flattened. In conjunction with Figure 1, the first housing 201 and the second housing 202 are rotated to the left and right sides of the hinge assembly 203, respectively, with the first housing 201 and the second housing 202 being approximately 180° apart, and the foldable display 100 is in the flattened state.

[0154] As shown in FIG11 , when the hinge assembly 203 is in the folded state, the first door panel A1 and the second door panel A2 rotate to the top of the shaft seat 210 (i.e., the front side of the shaft seat 210), and the distance between one end of the first door panel A1 close to the shaft seat 210 and the other end of the second door panel A2 close to the shaft seat 210 is greater than the distance between the other ends, so that the angle between the first door panel A1 and the second door panel A2 is an acute angle less than a certain angle (which can be set as needed). In this case, the first bending zone 131 and the second bending zone 132 respectively have an angle with the third bending zone 133, and the third display area 130 is folded. In conjunction with FIG2 , the first shell 201 and the second shell 202 are each rotated to the top of the hinge assembly 203, and the first shell 201 and the second shell 202 are approximately 0°. The first shell 201 and the second shell 202 are combined together, and the foldable display screen 100 is in the folded state.

[0155] It should be noted that, in conjunction with Figure 11, since the first door panel A1 is rotatably connected to the connecting member C11, the second door panel A2 is rotatably connected to the connecting member C21, and the connecting member C11 is fixedly connected to the first shell 201 shown in Figure 2, and the connecting member C21 is fixedly connected to the second shell 202 shown in Figure 2, therefore, the first door panel A1 can rotate relative to the first shell 201, and the second door panel A2 can rotate relative to the second shell 202, which makes the rotation angle of the first shell 201 shown in Figure 2 relative to the shaft seat 210 smaller than the rotation angle of the first door panel A1 relative to the first shell 201 shown in Figure 2, and the rotation angle of the second shell 202 shown in Figure 2 relative to the shaft seat 210 can be smaller than the rotation angle of the second door panel A2 relative to the second shell 202 shown in Figure 2, so that the distance between one end of the first door panel A1 close to the shaft seat 210 and one end of the second door panel A2 close to the shaft seat 210 is greater than the distance between the other ends. In this way, the third display area 130 can be folded into a water drop shape, and the foldable display screen 100 can be folded to present a water drop screen.

[0156] It should be understood that in other embodiments, the first door panel A1 and the connecting member C11 as well as the second door panel A2 and the connecting member C21 may also be fixedly connected, and this embodiment of the present application does not limit this.

[0157] It can be understood, referring to Figures 7 and 8 , that the first door panel A1 can be rotatably connected to all or part of the first connectors included in the connecting assembly C; and the second door panel A2 can be rotatably connected to all or part of the second connectors included in the connecting assembly C. For example, the first door panel A1 is rotatably connected to the connector C11 and the connector C13, respectively, and the second door panel A2 is rotatably connected to the connector C21 and the connector C23, respectively.

[0158] Optionally, the first door panel A1 and the second door panel A2 are whole panels extending in the Y-axis direction. In other embodiments, the first door panel A1 and the second door panel A2 can also be split into multiple sub-door panels distributed in the Y-axis direction. The number of sub-door panels can be equivalent to the number of door panel swing arms, and one sub-door panel is slidingly connected to one door panel swing arm.

[0159] The door panel swing arm assembly B01 includes four pairs of door panel swing arm pairs spaced apart along the Y-axis direction of the shaft seat 210, namely, door panel swing arm pair B011, door panel swing arm pair B012, door panel swing arm pair B013, and door panel swing arm pair B014. Optionally, in other embodiments, the door panel swing arm assembly B01 may further include more or fewer pairs of door panel swing arm pairs, for example, one, two, three, six, etc., which is not limited in this embodiment of the present application.

[0160] A door panel swing arm pair includes a first door panel swing arm and a second door panel swing arm. For ease of distinction, the first door panel swing arm and the second door panel swing arm included in door panel swing arm pair B011 will be referred to as door panel swing arm B111 and door panel swing arm B211, the first door panel swing arm and the second door panel swing arm included in door panel swing arm pair B012 will be referred to as door panel swing arm B112 and door panel swing arm B212, the first door panel swing arm and the second door panel swing arm included in door panel swing arm pair B013 will be referred to as door panel swing arm B113 and door panel swing arm B213, and the first door panel swing arm and the second door panel swing arm included in door panel swing arm pair B014 will be referred to as door panel swing arm B114 and door panel swing arm B214.

[0161] The following description will be made using the door panel swing arm B111 and the door panel swing arm B211 included in the door panel swing arm pair B011 as an example, and other door panel swing arm pairs can be implemented accordingly.

[0162] In Figure 8, the door panel swing arm B111 and the door panel swing arm B211 are respectively located on opposite sides of the axle seat 210 in the X-axis direction, and the door panel swing arm B111 and the door panel swing arm B211 are mirror-symmetrical in the X-axis direction. In other embodiments, for structural design considerations, the door panel swing arm B111 and the door panel swing arm B211 may also be staggered by a certain distance in the Y-axis direction.

[0163] Door panel swing arm B111 is located between the left side of axle base 210 and the first door panel A1, and door panel swing arm B211 is located between the right side of axle base 210 and the second door panel A2. One end of door panel swing arm B111 and one end of door panel swing arm B211 are respectively rotatably connected to axle base 210, allowing door panel swing arm B111 and door panel swing arm B211 to rotate about axle base 210. The other end of door panel swing arm B111 is slidably connected to the first door panel A1. For example, a linear slide groove is provided on the first door panel A1, and the other end of door panel swing arm B111 extends into the linear slide groove on the first door panel A1 and can slide within the linear slide groove. Similarly, the other end of door panel swing arm B211 is slidably connected to the second door panel A2.

[0164] In this way, when the first door panel A1 and the second door panel A2 rotate relative to each other, the door panel swing arm B111 and the door panel swing arm B211 located on both sides of the axle seat 210 are also driven to rotate relative to each other. At the same time, the door panel swing arm B111 and the first door panel A1, as well as the door panel swing arm B211 and the second door panel A2, slide relative to each other in a relatively away direction, and the length of the assembly formed by the door panel swing arm B111 and the first door panel A1, and the length of the assembly formed by the door panel swing arm B211 and the second door panel A2 are extended. When the first door panel A1 and the second door panel A2 rotate relatively away from each other, the door panel swing arm B111 and the door panel swing arm B211 located on both sides of the axle seat 210 are also driven to rotate relatively away from each other. At the same time, the door panel swing arm B111 and the first door panel A1, as well as the door panel swing arm B211 and the second door panel A2 slide relative to each other in a relatively close direction, and the length of the assembly formed by the door panel swing arm B111 and the first door panel A1, and the length of the assembly formed by the door panel swing arm B211 and the second door panel A2 are shortened.

[0165] Taking the door panel swing arm B111 and the door panel swing arm B211 included in the door panel swing arm pair B011 as an example, the specific implementation of the rotational connection between them and the axle seat 210 is exemplified.

[0166] In some embodiments, referring to FIG. 12 , the rotating shaft assembly 203 further includes a rotating shaft B10 and a rotating shaft B20. The door panel swing arm B111 is rotationally connected to the base 210a via the rotating shaft B10, and the door panel swing arm B211 is rotationally connected to the base 210a via the rotating shaft B20. The following description uses the rotational connection between the door panel swing arm B111 and the base 210a via the rotating shaft B10 as an example. The specific implementation of the rotational connection between the door panel swing arm B211 and the base 210a via the rotating shaft B20 can be referred to in the following embodiments.

[0167] It can be understood that the rotating shaft B10 can be a rotating shaft that is separately molded from the door panel swing arm B111 and the base 210a. The door panel swing arm B111 and the base 210a can be respectively provided with a rotating shaft hole B11 and a rotating shaft hole B12. The rotating shaft B10 can be passed through the rotating shaft hole B11 and the rotating shaft hole B12 on the door panel swing arm B111 and the base 210a to realize the rotational connection between the first swing arm B1 and the base 210a. This situation is exemplarily shown in Figure 12.

[0168] Of course, the rotating shaft B10 can also be an integral structure integrally formed with the door panel swing arm B111, with a rotating shaft hole being provided on the base 210a, and the rotating shaft B10 rotatably engaging with the rotating shaft hole on the shaft seat 210. Similarly, the rotating shaft B10 can also be an integral structure integrally formed with the base 210a, with a rotating shaft hole being provided on the door panel swing arm B111, and the rotating shaft B10 rotatably engaging with the rotating shaft hole on the door panel swing arm B111.

[0169] It can be seen that in the above embodiment, the door panel swing arm B111 and the door panel swing arm B211 are respectively connected to the base 210a through physical shafts (rotation shaft B10 and rotation shaft B20). It should be understood that the door panel swing arm B111 and the base 210a, as well as the door panel swing arm B211 and the base 210a, can also be connected through other means, as long as the door panel swing arm B111 and the door panel swing arm B211 can be rotatably connected to the base 210a. For example, the door panel swing arm B111 and the base 210a, as well as the door panel swing arm B211 and the base 210a, can also be connected through virtual shafts for rotation. This will be discussed later when describing the first main swing arm B121 and the second main swing arm B221. It can be adaptively referred to and understood, and will not be described in detail here.

[0170] Continuing with reference to Figures 7 and 8, the main swing arm assembly B02 includes three groups of main swing arm pairs spaced apart along the Y-axis direction of the shaft seat 210, namely, main swing arm pair B021, main swing arm pair B022, and main swing arm pair B023. Optionally, in other embodiments, the main swing arm assembly B02 may further include more or fewer groups of main swing arm pairs, for example, one, two, or six groups, etc., which is not limited in this embodiment of the present application.

[0171] A main swing arm pair includes a first main swing arm and a second main swing arm. For ease of distinction, the first and second main swing arms included in the main swing arm pair B021 will be referred to as main swing arms B121 and B221, the first and second main swing arms included in the main swing arm pair B022 will be referred to as main swing arms B122 and B222, and the first and second main swing arms included in the main swing arm pair B023 will be referred to as main swing arms B123 and B223.

[0172] The following description will be made using the main swing arm B121 and the main swing arm B221 included in the main swing arm pair B021 as an example, and other main swing arm pairs can be implemented accordingly.

[0173] Main swing arm B121 and main swing arm B221 are each located on opposite sides of axle base 210 (specifically, base 210a) in the X-axis direction. Main swing arm B121 is located between the left side of axle base 210 and connector C11, while main swing arm B221 is located between the right side of axle base 210 and connector C21. One end of main swing arm B121 and one end of main swing arm B221 are respectively rotationally connected to axle base 210. The other end of main swing arm B121 is rotationally connected to connector C11, while the other end of main swing arm B221 is rotationally connected to connector C21.

[0174] The following first describes the specific implementation of the rotational connection between one end of the main swing arm B121 and one end of the main swing arm B221 and the shaft seat 210 respectively.

[0175] In some embodiments, referring to FIG13 , one end of the main swing arm B121 is provided with an arc-shaped sliding portion B121a, and the base 210a is provided with an arc-shaped sliding connection portion B121b. The arc-shaped sliding portion B121a and the arc-shaped sliding connection portion B121b are slidably connected to each other, so that one end of the main swing arm B121 is rotationally connected to the base 210a. Similarly, one end of the main swing arm B221 is provided with an arc-shaped sliding portion B221a, and the base 210a is provided with an arc-shaped sliding connection portion B221b. The arc-shaped sliding portion B221a and the arc-shaped sliding connection portion B221b are slidably connected to each other, so that one end of the main swing arm B221 is rotationally connected to the base 210a.

[0176] Since there is no physical axis (such as the structure similar to the rotating shaft B10 and the rotating shaft B20 mentioned above), here, the main swing arm B121 and the shaft seat 210 are connected by sliding connection through the arc-shaped sliding portion B121a and the arc-shaped sliding connection portion B121b to achieve rotational connection. It can be regarded as the main swing arm B121 and the base 210a being rotationally connected through a virtual axis. Similarly, the main swing arm B221 and the base 210a can also be regarded as being rotationally connected through a virtual axis. In Figure 13, since the main swing arm B121 and the main swing arm B221 are respectively connected to the shaft seat 210 through virtual axes, they will occupy a larger size of the base 210a in the X-axis direction. In order to avoid interference during rotation, the main swing arm B121 and the main swing arm B221 are staggered a distance in the Y-axis direction. In other embodiments, for example, in a scenario where there will be no interference during rotation, the main swing arm B121 and the main swing arm B221 can also be mirror-symmetrical in the X-axis direction.

[0177] Taking the arc-shaped sliding portion B121a and the arc-shaped sliding connection portion B121b as an example, it can be understood that the arc-shaped sliding portion B121a and the arc-shaped sliding connection portion B121b slide relative to each other along a circular arc trajectory to achieve relative rotation. The arc-shaped sliding portion B121a and the arc-shaped sliding connection portion B121b are both arc-shaped structures, and can be of various forms, as long as they can contact and cooperate with each other by sliding relative to each other along a circular arc trajectory. The arc-shaped sliding portion B121a and the main swing arm B121 can be a one-piece structure formed integrally, or they can be formed separately and fixedly connected; similarly, the arc-shaped sliding connection portion B121b and the base 210a can be a one-piece structure formed integrally, or they can be formed separately and fixedly connected.

[0178] Optionally, one of the arc-shaped sliding portion B121a and the arc-shaped sliding connection portion B121b is a circular arc-shaped slide rail, and the other is a circular arc-shaped chute. FIG13 exemplifies a case where the arc-shaped sliding portion B121a is a circular arc-shaped slide rail and the arc-shaped sliding connection portion B121b is a circular arc-shaped chute. Of course, the two can also be reversed, that is, the arc-shaped sliding portion B121a is a circular arc-shaped chute and the arc-shaped sliding connection portion B121b is a circular arc-shaped slide rail. The arc-shaped sliding portion B121a and the arc-shaped sliding connection portion B121b are in surface contact, and the arc-shaped slide rail can slide along the groove wall of the circular arc-shaped chute and contact the groove wall of the circular arc-shaped chute.

[0179] It is understood that the arc-shaped slide rail can be a variety of structural forms of arc-shaped slide rails, for example, it can be a plate-shaped arc-shaped slide rail (Figure 13 shows this case by way of example), or it can be a convex strip-shaped arc-shaped slide rail, but it is not limited thereto, as long as it can be slidably connected to the arc-shaped slide groove along the arc-shaped trajectory. Such an arrangement, because the arc-shaped slide rail is slidably connected to the arc-shaped slide groove and the two are in surface contact, is beneficial to improving the stability and reliability of the relative sliding of the arc-shaped sliding portion and the arc-shaped sliding connection portion compared to point contact and line contact, thereby improving the stability of the rotational cooperation between the main swing arm B121 and the base 210a.

[0180] The coordination between the arcuate sliding portion B121a and the arcuate sliding connection portion B121b is not limited to the coordination between an arcuate slide rail and an arcuate slide groove. For example, the arcuate sliding portion B121a and the arcuate sliding connection portion B121b can both be arcuate slide plates or arcuate slide rails, with their outer walls comprising arcuate walls. The arcuate walls of the arcuate sliding portion B121a and the arcuate sliding connection portion B121b can be slidably connected and in surface contact with each other, or the two can slide along an arcuate trajectory to rotationally connect the main swing arm B121 to the base 210a.

[0181] It is understandable that in other embodiments, the main swing arm B121 and the main swing arm B221 can be rotationally connected to the base 210a respectively in other ways, such as the above-mentioned physical axis.

[0182] 7 and 8 , the following describes the specific implementation of the rotational connection between the other end of the main swing arm B121 and the connecting member C11, and the rotational connection between the other end of the main swing arm B221 and the connecting member C21.

[0183] In some embodiments, the other end of the main swing arm B121 is rotationally connected to the connector C11 via a physical axis, and the other end of the main swing arm B221 is rotationally connected to the connector C21 via a physical axis. The specific implementation can be adaptively referenced by the aforementioned embodiment in which the door panel swing arm B111 and the door panel swing arm B211 are each rotationally connected to the base 210a via a physical axis. In other embodiments, the main swing arm B121 and the connector C11, and the main swing arm B221 and the connector C21, can also be rotationally connected via other means, such as the aforementioned virtual axis.

[0184] Continuing with reference to Figures 7 and 8, the auxiliary swing arm assembly B03 includes two auxiliary swing arm pairs spaced apart along the Y-axis direction of the axle seat 210, namely, auxiliary swing arm pair B031 and auxiliary swing arm pair B032. Optionally, in other embodiments, the auxiliary swing arm assembly B03 may further include more or fewer auxiliary swing arm pairs, for example, one, three, or six groups, etc., which is not limited in this embodiment of the present application.

[0185] A pair of auxiliary swing arms includes a first auxiliary swing arm and a second auxiliary swing arm. For ease of distinction, the first and second auxiliary swing arms included in the auxiliary swing arm pair B031 will be referred to as auxiliary swing arms B131 and B231, respectively, and the first and second auxiliary swing arms included in the auxiliary swing arm pair B032 will be referred to as auxiliary swing arms B132 and B232, respectively.

[0186] The following description will be made using the auxiliary swing arm B131 and the auxiliary swing arm B231 included in the auxiliary swing arm pair B031 as an example, and other auxiliary swing arm pairs can be implemented accordingly.

[0187] The auxiliary swing arm B131 and the auxiliary swing arm B231 are each located on opposite sides of the axle base 210 in the X-axis direction. The auxiliary swing arm B131 is located between the left side of the axle base 210 and the connector C11, while the auxiliary swing arm B231 is located between the right side of the axle base 210 and the connector C21. One end of the auxiliary swing arm B131 and one end of the auxiliary swing arm B231 are respectively rotatably connected to the axle base 210. The other end of the auxiliary swing arm B131 is slidably connected to the connector C11. For example, a linear slot is provided on the connector C11, and the other end of the auxiliary swing arm B131 extends into the linear slot on the connector C11 and can slide within the linear slot. Similarly, the other end of the auxiliary swing arm B231 is slidably connected to the connector C21.

[0188] Alternatively, referring to Figures 7 and 8, the auxiliary swing arm B131 and the auxiliary swing arm B231 are respectively connected to the shaft seat 210 through a physical shaft. The specific implementation can be adaptively referred to the aforementioned implementation in which the door panel swing arm B111 and the door panel swing arm B211 are each connected to the shaft seat 210 through a physical shaft. In Figure 8, since the auxiliary swing arm B131 and the auxiliary swing arm B231 are respectively connected to the shaft seat 210 through a physical shaft, the size of the shaft seat 210 occupied in the X-axis direction is relatively small. Therefore, the auxiliary swing arm B131 and the auxiliary swing arm B231 are staggered by a distance in the Y-axis direction, so that the main swing arm B121 and the main swing arm B221, as well as the auxiliary swing arm B131 and the auxiliary swing arm B231 can be staggered to avoid interference between the main swing arm B121 and the main swing arm B221 during rotation. As shown in Figure 8, the main swing arm B121 and the auxiliary swing arm B231 are opposite each other and staggered with the main swing arm B221; the auxiliary swing arm B131 is opposite the main swing arm B221 and staggered with the auxiliary swing arm B231. In other embodiments, for example, in a scenario where the main swing arm B121 and the main swing arm B221 do not interfere with each other during rotation, the auxiliary swing arm B131 and the auxiliary swing arm B231 can also be mirror-symmetrical in the X-axis direction.

[0189] It should be understood that in other embodiments, the auxiliary swing arm B131 and the auxiliary swing arm B231 can be rotationally connected to the shaft seat 210 respectively through other means, such as the above-mentioned virtual axis.

[0190] Continuing with reference to Figures 7 and 8, the damping swing arm assembly B04 includes two groups of damping swing arm pairs spaced apart along the Y-axis direction of the shaft seat 210, namely, damping swing arm pair B041 and damping swing arm pair B042. Optionally, in other embodiments, the damping swing arm assembly B04 may further include more or fewer groups of damping swing arm pairs, for example, one, three, or six groups, etc., which is not limited in this embodiment of the present application.

[0191] A damping swing arm pair includes a first damping swing arm and a second damping swing arm. For ease of distinction, the first damping swing arm and the second damping swing arm included in the damping swing arm pair B041 are referred to as damping swing arm B141 and damping swing arm B241, and the first damping swing arm and the second damping swing arm included in the damping swing arm pair B042 are referred to as damping swing arm B142 and damping swing arm B242.

[0192] The following description will be made using the damping swing arm B141 and the damping swing arm B241 included in the damping swing arm pair B041 as an example, and other damping swing arm pairs can be implemented accordingly.

[0193] The damping swing arm B141 and the damping swing arm B241 are respectively located on opposite sides of the shaft seat 210 in the X-axis direction. Among them, the damping swing arm B141 is located between the left side of the shaft seat 210 and the connecting member C11, and the damping swing arm B241 is located between the right side of the shaft seat 210 and the connecting member C21.

[0194] The hinge assembly 203 also includes a damping assembly 271 mounted on the shaft base 210. The damping assembly 271 is connected to the damping swing arm B141 and the damping swing arm B241, respectively. For example, the damping assembly 271 can directly engage with the damping swing arm B141 and the damping swing arm B241 to provide a damping force for the damping swing arm B141 and the damping swing arm B241. This configuration provides a certain amount of damping when the damping swing arms B141 and the damping swing arms B241 on either side of the shaft base 210 rotate relative to each other. This helps the damping swing arms B141 and the damping swing arms B241 to maintain or remain at a predetermined angle after rotating relative to the shaft base 210. This provides a certain cushioning effect during the rotation of the hinge assembly 203 between the flattened state and the folded state, thereby improving the stability of the foldable electronic device 01 in different folding modes and the user's operating experience.

[0195] It can be understood that the damping assembly 271 can be various types of assemblies capable of providing damping force, for example, a damping assembly including an assembled cam structure and an elastic member, etc., but is not limited thereto.

[0196] One end of the damping swing arm B141 and one end of the damping swing arm B241 are respectively rotatably connected to the shaft seat 210. For example, Figure 8 shows a rotational connection achieved through the aforementioned physical shaft. The other end of the damping swing arm B141 is connected to the connector C11 with a high-pair joint, while the other end of the damping swing arm B241 is connected to the connector C21 with a high-pair joint. A high-pair joint allows two mating components to slide and rotate relative to each other.

[0197] In FIG8 , the damping swing arm B141 and the damping swing arm B241 are mirror-symmetrical in the X-axis direction. In other embodiments, the damping swing arm B141 and the damping swing arm B241 may also be staggered by a certain distance in the Y-axis direction.

[0198] Optionally, the shaft assembly 203 further includes a synchronization assembly 272 mounted on the shaft seat 210, and the damping swing arm B141 and the damping swing arm B241 are connected via the synchronization assembly 272. With this arrangement, the damping swing arm B141 and the damping swing arm B241 located on either side of the shaft seat 210 can be linked via the synchronization assembly 272, thereby achieving synchronous rotation, i.e., they can synchronously rotate relatively close to each other to a folded state, or synchronously rotate relatively apart to a flattened state. It is understood that the synchronization assembly 272 can be any assembly for synchronously rotating two components, such as, but not limited to, various types of gear assemblies, worm gear transmission assemblies, friction wheel transmission assemblies, etc.

[0199] Since the damping swing arm B141 and the damping swing arm B241 can rotate synchronously, the damping swing arm B141 can also be called the synchronous swing arm B141, and the damping swing arm B241 can also be called the synchronous swing arm B241. It can be understood that in other embodiments, the damping swing arm and the synchronous swing arm can also be two different swing arms.

[0200] In Figure 8, the door panel swing arm B111, main swing arm B121, auxiliary swing arm B131 and damping swing arm B141 located on the same side of the axle seat 210 are all connected to the connecting part C11, and the door panel swing arm B211, main swing arm B221, auxiliary swing arm B231 and damping swing arm B241 located on the same side of the axle seat 210 are all connected to the connecting part C12; the door panel swing arm B114, main swing arm B123, auxiliary swing arm B132 and damping swing arm B142 located on the same side of the axle seat 210 are all connected to the connecting part C13, and the door panel swing arm B214, main swing arm B223, auxiliary swing arm B232 and damping swing arm B242 located on the same side of the axle seat 210 are all connected to the connecting part C23. In other embodiments, the connecting parts connected to each swing arm can also be independent connecting parts, or connecting parts that are partially independent and partially shared (for example, the door panel swing arm B111 and the main swing arm B121 are both connected to one connecting part, while the auxiliary swing arm B131 is connected to an independent connecting part, and the damping swing arm B141 is connected to an independent connecting part).

[0201] In Figure 8, the connectors C11, C12, and C13 located on the left side of the shaft seat 210 are all separate structural parts, and the connectors C21, C22, and C23 located on the right side of the shaft seat 210 are all separate structural parts. In other embodiments, the connectors located on the same side of the shaft seat 210 can be fixedly connected to form an integrated structural part.

[0202] It should be noted that in other embodiments, the types of swing arms may be more or fewer, for example, no auxiliary swing arm is provided. It should be understood that the more types and numbers of swing arms there are, the higher the stability of the rotating shaft assembly 203 during rotation. In specific implementations, the types and numbers of swing arms may be set as needed.

[0203] In some embodiments, the first swing arm B1 and the second swing arm B2 shown in FIG7 can be the first door panel swing arm and the second door panel swing arm included in a door panel swing arm pair shown in FIG8 , for example, the first swing arm B1 is the door panel swing arm B111, and the second swing arm B2 is the door panel swing arm B211. FIG7 exemplifies this embodiment, and subsequent embodiments are described based on the assumption that the first swing arm B1 is the door panel swing arm B111 and the second swing arm B2 is the door panel swing arm B211.

[0204] In some other embodiments, the first swing arm B1 and the second swing arm B2 shown in Figure 7 can also be the first main swing arm and the second main swing arm included in a group of main swing arm pairs shown in Figure 8, for example, the first swing arm B1 can be the main swing arm B121, and the second swing arm B2 can be the main swing arm B221.

[0205] In some other embodiments, the first swing arm B1 and the second swing arm B2 shown in Figure 7 can also be the first auxiliary swing arm and the second auxiliary swing arm included in a group of auxiliary swing arm pairs shown in Figure 8, for example, the first swing arm B1 is the auxiliary swing arm B131, and the second swing arm B2 can be the auxiliary swing arm B231.

[0206] In some other embodiments, the first swing arm B1 and the second swing arm B2 shown in Figure 7 can also be the first damping swing arm and the second damping swing arm included in a set of damping swing arm pairs shown in Figure 8, for example, the first swing arm B1 is the damping swing arm B141, and the second swing arm B2 can be the damping swing arm B241.

[0207] The structure and function of the multi-stable support plate 260 will be described below with reference to FIG. 14 to FIG. 19 .

[0208] Please refer to Figures 14 and 15. Figure 14 is a schematic diagram of the structure of a multi-stable support plate provided in an embodiment of the present application. It should be noted that Figure 14 illustrates the multi-stable support plate 260 shown in Figure 7 from the back side of the multi-stable support plate 260. Four regions Q are circled by four dotted circles in Figure 14, and Figure 15 is an enlarged view of one of the regions Q shown in Figure 14 (i.e., region Q1).

[0209] 15 , the multi-stable support plate 260 includes a support portion 261 , a multi-stable mechanism 262 , and a drive mechanism 263 , wherein the multi-stable mechanism 262 and the drive mechanism 263 are both disposed on the back of the support portion 261 .

[0210] It should be noted that the multi-stable mechanism 262 refers to a mechanism that can exist in at least two stable states when not subject to external forces. For ease of understanding, the present embodiment of the application uses the bistable mechanism 262 as an example for description. Correspondingly, the multi-stable support plate 260 is referred to as the bistable support plate 260.

[0211] The bistable mechanism 262 is a mechanism that can, when not subject to external forces, be in two different stable states and one unstable equilibrium state. In this embodiment of the present application, the two stable states of the bistable mechanism 262 are referred to as the first stable state and the second stable state. The first and second stable states are typically local energy minima, while the unstable equilibrium state is a local energy maximum. Switching between these states requires an external driving force disturbance.

[0212] In the embodiment of the present application, the bistable mechanism 262 is disposed on the back side of the support portion 261. Thus, the bistable mechanism 262 can switch states under the driving force provided by the driving mechanism 263 acting on the first swing arm B1 and / or the second swing arm B2 shown in FIG7 , thereby driving the support portion 261 connected thereto to move to different positions along the Z-axis direction (which may also be at a certain angle to the Z-axis direction). It should be understood that the Z-axis direction is a direction perpendicular to the plate surface of the support portion 261, and is also the thickness direction of the support portion 261. This will be described in detail below with reference to the accompanying drawings.

[0213] Optionally, referring to FIG. 15 , the bistable mechanism 262 may be a compliant bistable mechanism 262 .

[0214] The compliant bistable mechanism 262 includes a moving block 2621 , a first compliant beam 2622 , a second compliant beam 2623 , a first fixed block 2624 , and a second fixed block 2625 .

[0215] The first fixed block 2624 and the second fixed block 2625 are spaced apart in the X-axis direction. The first fixed block 2624 is located on a first side of the centerline O32 of the support portion 261, and the second fixed block 2625 is located on a second side of the centerline O32 of the support portion 261. The centerline O32 of the support portion 261 is a reference line that passes through the center O3 of the support portion 261 in the X-axis direction and extends along the Y-axis direction. The X-axis direction can be understood as the width direction of the support portion 261, and the Y-axis direction can be understood as the length direction of the support portion 261. The first fixed block 2624 and the second fixed block 2625 are fixed to the shaft seat of the shaft assembly 203 shown in Figure 7. The term "fixed" means that the two fixed parts cannot move relative to each other, and this does not limit whether the two fixed parts are removable.

[0216] Specifically, please refer to Figure 16, which is a schematic diagram of the installation of the bistable support plate and the shaft seat provided in an embodiment of the present application.

[0217] Figure 16(a) illustrates a structure where the first fixing block 2624 and the second fixing block 2625 have not yet been assembled with the first mounting platform 214 and the second mounting platform 215. As can be seen from Figure 16(a), the shaft seat 210 includes the first mounting platform 214 and the second mounting platform 215 symmetrically arranged on both sides of the center line O11 (i.e., the second center line).

[0218] The first mounting platform 214 has a first notch 214a, which faces the side where the second mounting platform 215 is located and the side where the support portion 261 is located. The surface of the first mounting platform 214 forming the first notch 214a includes a first surface 214b and a second surface 214c. The first surface 214b faces the side where the second mounting platform 215 is located, and the second surface 214c faces the side where the support portion 261 is located. The first surface 214b has a first groove 214d extending along the Z-axis direction, and the second surface 214c has a third groove 214e extending along the Y-axis direction.

[0219] The second mounting platform 215 has a second notch 215a, which faces the side where the first mounting platform 214 is located and the side where the support portion 261 is located. The surface of the second mounting platform 215 forming the second notch 215a includes a third surface 215b and a fourth surface 215c. The third surface 215b faces the side where the first mounting platform 214 is located, and the fourth surface 215c faces the side where the support portion 261 is located. The third surface 215b has a second groove 215d extending along the Z-axis direction, and the fourth surface 215c has a fourth groove 215e extending along the Y-axis direction.

[0220] As shown in FIG16( a ), the first fixing block 2624 and the second fixing block 2625 are arranged axially symmetrically about the centerline O31 of the support portion 261. The first fixing block 2624 is located on a first side of the centerline O31 of the support portion 261, and the second fixing block 2625 is located on a second side of the centerline O31 of the support portion 261. The centerline O31 of the support portion 261 is a reference line that passes through the center O3 of the support portion 261 in the X-axis direction and extends along the Z-axis. The centerline O31 of the support portion 261 overlaps with the centerline O11 of the shaft seat 210.

[0221] The first fixing block 2624 has a first protrusion E1 extending along the Z-axis direction on the side facing away from the second fixing block 2625, and the first protrusion E1 is adapted to the first groove 214d; the end E3 of the first fixing block 2624 facing away from the support portion 261 is adapted to the third groove 214e; the second fixing block 2625 has a second protrusion E2 extending along the Z-axis direction on the side facing away from the first fixing block 2624, and the second protrusion E2 is adapted to the second groove 215d; the end E4 of the second fixing block 2625 facing away from the support portion 261 is adapted to the fourth groove 215e.

[0222] FIG16( b ) illustrates a structure in which the first fixing block 2624 and the second fixing block 2625 shown in FIG16( a ) are respectively assembled with the first mounting platform 214 and the second mounting platform 215 shown in FIG16( a ).

[0223] As shown in FIG16(b), the first fixing block 2624 shown in FIG16(a) is seated in the first notch 214a shown in FIG16(a). The end E3 of the first fixing block 2624 facing away from the support portion 261 is embedded in the third groove 214e, and the first protrusion E1 is embedded in the first groove 214d shown in FIG16(a). In this way, the first fixing block 2624 shown in FIG16(a) and the first mounting platform 214 shown in FIG16(a) are fixed together by a mortise and tenon joint.

[0224] In this embodiment, the mortise and tenon joints between the first fixing block 2624 and the first mounting platform 214 can make the compliant bistable mechanism 262 more firmly fixed on the shaft seat 210 and less likely to shake, thereby increasing the connection reliability of the compliant bistable mechanism 262.

[0225] It should be understood that the mortise and tenon between the first fixing block 2624 and the third groove 214e can achieve fixation in the Y-axis direction, and the mortise and tenon between the first protrusion E1 and the first groove 214d can achieve fixation in the X-axis direction.

[0226] In addition, in some embodiments, referring to FIG. 16( b ), to secure the first fixing block 2624 and the first mounting platform 214 in the Z-axis direction, the contact portion between the first fixing block 2624 and the first mounting platform 214 may be welded. For example, when the first fixing block 2624 is secured to the first mounting platform 214 via the mortise and tenon joint arrangement, laser welding may be performed along the bold path shown in FIG. 16( b ). Thus, the contact portion between the first fixing block 2624 and the first mounting platform 214 (the two surfaces of the first notch 214 a being the contact portions with the first fixing block 2624) may be welded. In this manner, the first fixing block 2624 and the first mounting platform 214 may be secured in the X-axis, Y-axis, and Z-axis directions, allowing the bistable support plate 260 to be securely mounted on the shaft seat 210 and prevented from falling off or moving.

[0227] It should be noted that the fixing method between the second mounting platform 215 and the second fixing block 2625 can be implemented with reference to the fixing method between the first mounting platform 214 and the first fixing block 2624, which will not be repeated here.

[0228] It should be understood that in other embodiments, fixation can be performed only in any one or more directions of the X-axis direction, the Y-axis direction, and the Z-axis direction, and the fixing method can also be other methods, which is not limited in the embodiments of the present application.

[0229] Continuing with FIG. 15 , the movable block 2621 is positioned between the first fixed block 2624 and the second fixed block 2625. The movable block 2621 and the first fixed block 2624 are connected by a first compliant beam 2622, and the movable block 2621 and the second fixed block 2625 are connected by a second compliant beam 2623. The movable block 2621 is connected to the support portion 261, thereby securing the compliant bistable mechanism 262 to the back side of the support portion 261. The first compliant beam 2622 and the second compliant beam 2623 can deform under the action of a driving force to drive the movable block 2621 to move up and down along the Z-axis. Of course, in other embodiments, the direction of movement of the movable block 2621 can also be at a certain angle to the Z-axis.

[0230] For example, please refer to FIG. 17 , which is a schematic diagram of a state of a compliant bistable mechanism 262 provided in an embodiment of the present application.

[0231] In (a) of Figure 17, the moving block 2621 moves to the first stable position, and the compliant bistable mechanism 262 is in the first stable state; in (b) of Figure 17, the moving block 2621 moves to the unstable equilibrium position, and the compliant bistable mechanism 262 is in the unstable equilibrium state; in (c) of Figure 17, the moving block 2621 moves to the second stable position, and the compliant bistable mechanism 262 is in the second stable state.

[0232] To facilitate understanding of the working principle of the compliant bistable mechanism 262 , the state switching process of the compliant bistable mechanism 262 shown in FIG. 17 will be described in detail below in conjunction with FIG. 18 .

[0233] Please refer to FIG. 18 , which is a comparison diagram of characteristic curves of reaction force f and displacement s of the bistable mechanism provided in an embodiment of the present application.

[0234] Curve S1 is a characteristic curve of reaction force f and displacement s of the compliant bistable mechanism 262 shown in Figure 17. Curves S2, S3, and S4 are characteristic curves of reaction force f and displacement s of the three types of bistable mechanisms 262 shown in Figure 19, respectively.

[0235] As can be seen from curve S1, displacement s can be understood as the displacement of moving block 2621; reaction force f can be understood as the force generated by the deformation of first compliant beam 2622 and second compliant beam 2623. It should be noted that point A in the figure corresponds to the first stable state of compliant bistable mechanism 262, with moving block 2621 in the first stable position; point B in the figure corresponds to the unstable equilibrium state of compliant bistable mechanism 262, with moving block 2621 in the unstable equilibrium position; and point C in the figure corresponds to the second stable state of compliant bistable mechanism 262, with moving block 2621 in the second stable position.

[0236] First, the process of the compliant bistable mechanism 262 switching from the first stable state to the second stable state, that is, the movement of the moving block 2621 from the first stable state position to the second stable state position, in FIG17 is described. This process corresponds to the change process from point A to point C in FIG18.

[0237] When moving block 2621 is in its first stable position (corresponding to point A in the diagram), if it is driven downward by a downward force, first compliant beam 2622 and second compliant beam 2623 follow the movement of moving block 2621. The deformation of first and second compliant beams 2622 and 2623 generates an upward and gradually increasing reaction force f, continuously storing deformation energy. When the driving force acting on moving block 2621 exceeds f1, first and second compliant beams 2622 and 2623 buckle and jump, and reaction force f rapidly decreases to zero. At this point, compliant bistable mechanism 262 is in an unstable equilibrium state, and moving block 2621 reaches an unstable equilibrium position with maximum elastic deformation (corresponding to point B in the diagram). In this case, it is only necessary to slightly apply a downward force to the moving block 2621. The first flexible beam 2622 and the second flexible beam 2623 will release the stored elastic deformation energy to push the moving block 2621 to move downward automatically. The reaction force f of the first flexible beam 2622 and the second flexible beam 2623 begins to increase in the opposite direction to a local maximum value f2 and then rapidly decreases to zero. At this time, the moving block 2621 reaches the second stable position (corresponding to point C in the figure). This position is a stable equilibrium position formed by the local minimum value of the elastic deformation energy. Therefore, the flexible bistable mechanism 262 can maintain stable balance and thus be in the second stable state.

[0238] Next, the process of the compliant bistable mechanism 262 switching from the second stable state to the first stable state, that is, the movement of the moving block 2621 from the second stable state position to the first stable state position, is described. This process corresponds to the change process from point C to point A in Figure 18.

[0239] When moving block 2621 is in the second stable position (corresponding to point B in the figure), if moving block 2621 is driven upward by an upward driving force, first compliant beam 2622 and second compliant beam 2623 follow the movement of moving block 2621. The first and second compliant beams 2622 and 2623 deform to generate a downward and gradually increasing reaction force f, continuously storing elastic deformation energy. When the driving force applied to moving block 2621 exceeds f2, the first and second compliant beams 2622 and 2623 buckle and jump, and the reaction force f rapidly decreases to 0. At this point, the compliant bistable mechanism 262 is in an unstable equilibrium state, and moving block 2621 reaches an unstable equilibrium position with maximum elastic deformation energy (corresponding to point B in the figure). In this case, it is only necessary to slightly apply an upward force to the moving block 2621. The first flexible beam 2622 and the second flexible beam 2623 will release the stored elastic deformation energy to push the moving block 2621 to continue to move upward. The reaction force f of the first flexible beam 2622 and the second flexible beam 2623 begins to increase in the opposite direction to a local maximum value f1 and then rapidly decreases to zero. At this time, the moving block 2621 reaches the first stable position (corresponding to point A in the figure). This position is a stable equilibrium position formed by the local minimum value of the elastic deformation energy. Therefore, the flexible bistable mechanism 262 can maintain stable balance and thus be in the first stable state.

[0240] As can be seen, whether moving block 2621 moves from the first stable position to the second stable position, or from the second stable position to the first stable position, it must pass through an unstable equilibrium position. Before moving block 2621 moves from the first stable position or the second stable position to an unstable equilibrium position, moving block 2621 moves under the drive of a driving force, thereby causing the first compliant beam 2622 and the second compliant beam 2623 to deform to store elastic deformation energy. When moving block 2621 reaches the unstable equilibrium position where the elastic deformation energy is maximum, only a slight driving force is required, and the first and second compliant beams 2622 and 2623 can release the stored elastic deformation energy to propel moving block 2621 to automatically move until it reaches the first stable position or the second stable position. As can be seen, during the process of moving block 2621 moving from the unstable equilibrium position to the first stable position or the second stable position, except for the slight force applied at the beginning, no further driving force is required during the subsequent movement process, and moving block 2621 relies on elastic deformation to move into place.

[0241] 17 and 18 illustrate the bistable mechanism 262 as a compliant bistable mechanism 262. It should be understood that in other embodiments, the bistable mechanism 262 may also be other types of multistable mechanisms, as long as it has two stable states.

[0242] For example, the bistable mechanism 262 may include only one compliant beam as shown in FIG. 9 , namely, one of the first compliant beam 2622 and the second compliant beam 2623, but at least one compliant beam is provided on each side of the centerline O32 on the bistable support plate 260. For example, referring to FIG. 14 , the bistable mechanism 262 in region Q0 includes the first compliant beam 2622, the bistable mechanism 262 in region Q1 includes the second compliant beam 2623, the bistable mechanism 262 in region Q2 includes the first compliant beam 2622, and the bistable mechanism 262 in region Q1 includes the second compliant beam 2623. In this case, the compliant beams on either side of the centerline O32 deform under the action of a driving force, causing the bistable mechanism 262 to switch states, thereby driving the support portion 261 connected thereto to move to different positions.

[0243] For another example, the bistable mechanism 262 may include only two compliant beams, as shown in FIG9 , namely, a first compliant beam 2622 and a second compliant beam 2623. In this case, one end of the first compliant beam 2622 and one end of the second compliant beam 2623 are directly connected to the back side of the support portion 261, while the other ends of the first compliant beam 2622 and the second compliant beam 2623 are directly fixed to the shaft assembly 203 shown in FIG7 . The first compliant beam 2622 and the second compliant beam 2623 are each configured to deform under a driving force to drive the bistable mechanism 262 to switch states. Compared to a solution with a single compliant beam, in this embodiment, the first compliant beam 2622 and the second compliant beam 2623 are connected to the support portion 261 at two separate locations along the X-axis, thereby driving the movement of the support portion 261 along the X-axis. This results in a more dispersed force on the support portion 261 along the X-axis, and a more stable movement of the support portion 261.

[0244] For another example, the first compliant beam 2622 and the second compliant beam 2623 included in the bistable mechanism 262 may not be aligned in the X-axis direction (ie, have the same Y coordinate), but may be staggered in the Y-axis direction (ie, have different Y coordinates).

[0245] For another example, the bistable mechanism 262 may also include only the first compliant beam 2622 and the second compliant beam 2623 in Figure 15, and the moving block 2621. In this case, one end of the first compliant beam 2622 and one end of the second compliant beam 2623 are connected to the back side of the support portion 261 through the moving block 2621, and the other end of the first compliant beam 2622 and the other end of the second compliant beam 2623 are directly fixed in the rotating shaft assembly 203 shown in Figure 7.

[0246] In this embodiment, one end of the first flexible beam 2622 and one end of the second flexible beam 2623 are respectively connected to the support part 261 through the moving block 2621. Compared with the solution in which one end of the first flexible beam 2622 and one end of the second flexible beam 2623 are directly connected to the support part 261, the connection with the support part 261 through the moving block 2621 forms a face-to-face connection, the force-bearing area of ​​the support part 261 is larger, and the movement process of the support part 261 is more stable.

[0247] For another example, the bistable mechanism 262 may also include only the first compliant beam 2622 and the second compliant beam 2623, and the first fixed block 2624 and the second fixed block 2625 in Figure 15. In this case, one end of the first compliant beam 2622 and one end of the second compliant beam 2623 are directly connected to the back side of the support portion 261, and the other end of the first compliant beam 2622 and the other end of the second compliant beam 2623 are fixed in the rotating shaft assembly 203 shown in Figure 7 through the first fixed block 2624 and the second fixed block 2625 respectively.

[0248] In this embodiment, the other end of the first flexible beam 2622 and the other end of the second flexible beam 2623 are fixed in the rotating shaft assembly 203 shown in Figure 7 through the first fixing block 2624 and the second fixing block 2625 respectively. Compared with the solution in which one end of the first flexible beam 2622 and one end of the second flexible beam 2623 are directly connected to the support part 261, the contact fixing area during fixation is larger and the fixation is more secure.

[0249] For another example, the bistable mechanism 262 can also be one of the three structures shown in FIG. 19 .

[0250] For example, please refer to FIG. 19 , which is a schematic structural diagram of three other bistable mechanisms provided in an embodiment of the present application.

[0251] The three bistable mechanisms 262 shown in FIG19 all have two stable states and one unstable equilibrium state. FIG19 only shows the unstable equilibrium states of the three bistable mechanisms 262.

[0252] Unlike the compliant bistable mechanism 262 shown in Figure 17 , Figure 19(a) includes two sets of first compliant beams 2622 and second compliant beams 2623. In this case, the characteristic curve of reaction force f versus displacement s corresponds to curve S2 in Figure 18 . Curve S2 in Figure 18 shows that curve S2 and curve S2 have similar shapes, and the reaction force f of curve S2 is roughly twice that of curve S1.

[0253] Unlike the flexible bistable mechanism 262 shown in Figure 17 , in Figure 19(b), a first rigid block 2626 is provided on the first compliant beam 2622, and a second rigid block 2627 is provided on the second compliant beam 2623. In this case, the characteristic curve of reaction force f versus displacement s corresponds to curve S3 in Figure 18 . As can be seen from curve S3 in Figure 18 , curve S3 is smoother than curve S2. This results in a smoother change in the reaction force f of the first and second compliant beams 2622, 2623 during motion, reducing impact and extending their lifespan.

[0254] Figure 19(c) adds a first compliant beam 2622 and a second compliant beam 2623 to Figure 19(b), with a first rigid block 2626 disposed on the first compliant beam 2622 and a second rigid block 2627 disposed on the second compliant beam 2623. In this case, the characteristic curve of reaction force f versus displacement s corresponds to curve S4 in Figure 18. As can be seen from curve S4 in Figure 18, the reaction force f of curve S4 is approximately twice the reaction force f of curve S3. The three bistable mechanisms 262 shown in Figure 19 can all be applied to the bistable support plate 260 shown in Figure 15. It should be understood that the aforementioned variations of the bistable mechanism 262 in Figure 15 are also applicable to each bistable mechanism 262 in Figure 19 and will not be further described here. The following description will use the bistable mechanism 262 in the bistable support plate 260 shown in Figure 15 as an example of the compliant bistable mechanism 262 shown in Figure 15.

[0255] As can be seen from the above, the position of the moving block 2621 of the compliant bistable mechanism 262 is different in different states. Based on this, in Figure 10, by driving the compliant bistable mechanism 262 to switch states, the moving block 2621 can drive the support portion 261 to move to different positions along the Z-axis direction (it can also be at a certain angle to the Z-axis direction). In this embodiment of the application, the compliant bistable mechanism 262 is driven to switch states by the first swing arm B1 and the second swing arm B2, so that the moving block 2621 drives the support portion 261 to move to different positions. The following is an example of the first swing arm B1 being the door panel swing arm B111 and the second swing arm B2 being the door panel swing arm B211.

[0256] 10 and 11 , the bistable support plate 260 is located between the third display area 130 and the front side of the shaft seat 210, and the support portion 261 can move up and down relative to the shaft seat 210. Optionally, the bistable support plate 260 is accommodated in the groove 211 of the shaft seat 210, and the support portion 261 can move up and down in the groove 211 of the shaft seat 210.

[0257] Specifically, when the rotating shaft assembly 203 moves from the folded state shown in Figure 11 to the flattened state shown in Figure 10, the bistable support plate 260 is subjected to the upward driving force provided by the first swing arm B1 and the second swing arm B2, and the moving block 2621 moves upward under the driving force, thereby driving the support portion 261 to move upward; when the rotating shaft assembly 203 moves from the flattened state shown in Figure 10 to the folded state shown in Figure 11, the bistable support plate 260 is subjected to the downward driving force, and the moving block 2621 moves downward, thereby driving the support portion 261 to move downward.

[0258] As shown in Figure 10, when the moving block 2621 moves to the first stable position, the flexible bistable mechanism 262 is in the first stable state, and the moving block 2621 drives the support part 261 to move to the first position, so as to support the third bending zone 133 in the flattened state shown in Figure 10; as shown in Figure 11, when the moving block 2621 moves to the second stable position, the flexible bistable mechanism 262 is in the second stable state, and the moving block 2621 drives the support part 261 to move to the second position, so as to provide screen space to avoid the third bending zone 133 in the folded state shown in Figure 11.

[0259] It can be understood that the first position shown in FIG10 is a position capable of supporting the third bending zone 133. For example, the first position shown in FIG10 may refer to the top of the groove 211, i.e., the plane where the first upper surface of the shaft seat 210 (i.e., the surface of the shaft seat 210 disposed outside the groove 211) lies. In this case, the upper surface of the bistable support plate 260 is flush with the first upper surface of the shaft seat 210, thereby supporting the third bending zone 133. The second position shown in FIG11 is a position capable of avoiding the third bending zone 133. For example, the second position shown in FIG11 may refer to the bottom of the groove 211, i.e., the plane where the second upper surface of the shaft seat 210 (i.e., the surface of the shaft seat 210 disposed at the bottom of the groove 211) lies. In this case, the upper surface of the bistable support plate 260 is located below the first upper surface of the shaft seat 210 and separated by a certain distance (which can be set as needed), thereby providing space to avoid the third bending zone 133.

[0260] As can be seen from FIG10 , the first stable state of the compliant bistable mechanism 262 corresponds to the flattened state of the rotating shaft assembly 203 shown in FIG10 . In this state, the moving block 2621 drives the support portion 261 to move to the first position. In FIG11 , the second stable state of the compliant bistable mechanism 262 corresponds to the folded state of the rotating shaft assembly 203 shown in FIG11 . In this state, the moving block 2621 drives the support portion 261 to move to the second position. In addition, in the embodiment of the present application, the state of the rotating shaft assembly 203 corresponding to the unstable equilibrium state of the compliant bistable mechanism 262 is referred to as the intermediate state of the rotating shaft assembly 203. The intermediate state of the rotating shaft assembly 203 refers to a state during the process of the rotating shaft assembly 203 moving from the flattened state shown in FIG10 to the folded state shown in FIG11 , or from the folded state shown in FIG11 to the flattened state shown in FIG10 . In this state, the moving block 2621 drives the support portion 261 to move to a third position between the first position and the second position. It should be understood that in other embodiments, when a multi-stable mechanism 262 with more stable states is used in Figures 10 and 11, the moving block 2621 can move to more stable positions, so that the support portion 261 can move to multiple positions and maintain at each position. The embodiments of the present application are not limited to this.

[0261] It should be noted that "stable state" refers to a state of equilibrium that is achieved by relying on its own stable characteristics without the need for external force. It can be seen that the bistable support plate 260 shown in Figures 10 and 11 is provided with a bistable mechanism 262 having two stable states, a first stable state and a second stable state, so that the support portion 261 shown in Figure 10 is stabilized in the first position by relying on the first stable state of the compliant bistable mechanism 262 without the need for external force, and the support portion 261 shown in Figure 11 is stabilized in the second position by relying on the second stable state of the compliant bistable mechanism 262. It should be understood that since the compliant bistable mechanism 262 is a structure of the bistable support plate 260, the stable characteristics of the compliant bistable mechanism 262 can be considered as the stable characteristics of the bistable support plate 260. Therefore, it can be understood that the bistable support plate 260 shown in Figures 10 and 11 can stabilize the support portion 261 in the first position shown in Figure 10 and the second position shown in Figure 11 without the need for external force by relying on its own stable characteristics.

[0262] When the bistable support plate 260, by virtue of its inherent stability, stabilizes the support portion 261 in the first position shown in Figure 10 , the compliant bistable mechanism 262 exerts no external reaction force. Consequently, no force is transmitted to the first and second swing arms B1 and B2, weakening the flattening and folding force of the hinge assembly 203. Instead, the flattening and folding force of the hinge assembly 203 is enhanced. Specifically, because the compliant bistable mechanism 262 maintains its stability without external forces, driving the support portion 261 out of the first position is equivalent to driving the compliant bistable mechanism 262 out of the first stable state. This generates a reaction force from the compliant bistable mechanism 262, creating resistance. This resistance hinders the rotation of the first and second swing arms B1 and B2 toward the folded position shown in Figure 11 , thereby hindering the hinge assembly 203 from moving toward the folded state shown in Figure 11 . This enhances the flattening and folding force of the hinge assembly 203, helping the hinge assembly 203 resist screen warping and maintain a well-flattened state.

[0263] In some embodiments, referring again to FIG. 10 or FIG. 11 , the movable block 2621 is centrally fixed to the back side of the support portion 261, i.e., the centerline O21 of the movable block 2621 overlaps the centerline O31 of the support portion 261. The centerline O21 of the movable block 2621 refers to a reference line passing through the center O2 of the movable block 2621 in the X-axis direction and extending along the Z-axis direction; the centerline O31 of the support portion 261 refers to a reference line passing through the center O3 of the support portion 261 in the X-axis direction and extending along the Z-axis direction. The X-axis direction can be understood as the width direction of the support portion 261, and the Z-axis direction can be understood as the thickness direction of the support portion 261. In this way, when the movable block 2621 drives the support portion 261 to move, the force acting on the support portion 261 is more centered, and the process of driving the support portion 261 to move is smoother. Of course, in other embodiments, the movable block 2621 may also be fixed to the back side of the support portion 261 in a non-central manner, and this embodiment of the present application is not limited to this.

[0264] In some embodiments, please continue to refer to Figure 10 or Figure 11, the first flexible beam 2622 and the second flexible beam 2623 are spaced apart in the X-axis direction. With this arrangement, the first flexible beam 2622 and the second flexible beam 2623 are connected to the support portion 261 at two dispersed positions in the X-axis direction, thereby driving the support portion 261 to move at the two dispersed positions in the X-axis direction, and the force on the support portion 261 in the X-axis direction is more dispersed, and the movement process of the support portion 261 is more stable.

[0265] In some embodiments, referring to Figures 10 or 11 , the compliant bistable mechanism 262 is axially symmetrical about the centerline O31 (i.e., the first centerline) of the support portion. Thus, under the driving force, the deformation of both sides of the compliant bistable mechanism 262 is consistent, and the movement of the support portion 261 is more stable. Of course, in other embodiments, the compliant bistable mechanism 262 may not be axially symmetrical, and this embodiment of the present application is not limited thereto. Of course, in other embodiments, the bistable mechanism 262 may not be axially symmetrical about the centerline O31 of the support portion.

[0266] Continuing with FIG15 , the drive mechanism 263 is the component of the bistable support plate 260 to which the first swing arm B1 and / or the second swing arm B2 shown in FIG7 exert a driving force. It will be appreciated that when the driving force exerted by the first swing arm B1 and / or the second swing arm B2 shown in FIG7 acts on the drive mechanism 263, the driving force is transmitted through the drive mechanism 263 to various parts of the bistable support plate 260, such as the support portion 261 and the bistable mechanism 262. Naturally, each component of the bistable support plate 260 is driven by the driving force. In this way, the bistable mechanism 262 can switch its state under the driving force, and the support portion 261 can move up and down relative to the shaft seat 210 under the driving force.

[0267] 15 , the drive mechanism 263 includes a first drive portion D1 and a second drive portion D2 spaced apart in the X-axis direction. The first drive portion D1 is located on a first side of the centerline O32 of the support portion 261 , and the second drive portion D2 is located on a second side of the centerline O32 of the support portion 261 .

[0268] The first driving part D1 and the second driving part D2 each include a first driving sub-part, a second driving sub-part, and a connecting part. For ease of distinction, in the embodiment of the present application, the parts contained in the first driving part D1 and the second driving part D2 are given different labels for marking, wherein the first driving part D1 includes a first driving sub-part D11, a second driving sub-part D12, and a connecting part D13, and the second driving part D2 includes a first driving sub-part D21, a second driving sub-part D22, and a connecting part D23. Taking the first driving part D1 as an example, the first driving sub-part D11 is located on the first side of the center line O32 of the support part 261. The first driving sub-part D11 is connected to the support part 261 and can be flush with the support part 261. Of course, in other embodiments, the first driving sub-part D11 may not be flush with the support part 261, for example, it may be lower than the upper surface of the support part 261.

[0269] The second driving sub-unit D12 and the first driving sub-unit D11 are spaced apart in the Z-axis direction, and the second driving sub-unit D12 is further away from the support portion 261. The connecting portion D13 is connected between the first end of the first driving sub-unit D11 and the first end of the second driving sub-unit D12. It can be seen that the second end of the first driving sub-unit D11 (the end away from the center line O32) and the second end of the second driving sub-unit D12 (the end away from the center line O32) are not connected, which makes the first driving unit D1 "U"-shaped and has an opening facing away from the center line O32 of the support portion 261. The opening of the first driving unit D1 can be understood as a "U"-shaped opening. In other embodiments, the first driving unit D1 can also have other structures, for example, in the shape of an "I", as long as it can be driven by the first swing arm B1 shown in Figure 7 respectively.

[0270] The positional relationship and connection relationship of each part in the second driving part D2 are similar to those of the first driving part D1 and will not be repeated here. The opening of the second driving part D2 also faces away from the center line O32 of the support part 261, and the opening of the first driving part D1 and the opening of the second driving part D2 are opposite to each other.

[0271] The first driving part D1 is the part of the bistable support plate 260 to which the driving force is applied by the first swing arm B1 shown in Figure 7, and can be used to drive the flexible bistable mechanism 262 to switch states under the action of the driving force provided by the first swing arm B1 shown in Figure 7; the second driving part D2 is the part of the bistable support plate 260 to which the driving force is applied by the second swing arm B2 shown in Figure 7, and can be used to drive the bistable mechanism 262 to switch states under the action of the driving force provided by the second swing arm B2 shown in Figure 7.

[0272] Specifically, please refer to Figures 20 and 21. Figure 20 is a cross-sectional view of the rotating shaft assembly shown in Figure 7 taken along the section line X3-X3 shown in Figure 14; Figure 21 is a schematic structural diagram of the rotating shaft assembly shown in Figure 20 in the folded state. It should be noted that Figure 21 can be understood as a cross-sectional view of the rotating shaft assembly 203 shown in Figure 14 in the folded state taken along the section line at the same position as the section line X3-X3.

[0273] It should be understood that the hinge assembly 203 shown in Figures 20 and 21 can be applied to the foldable electronic device 01 shown in Figures 1 and 2. It should be noted that the flattened state of the hinge assembly 203 shown in Figure 20 can be understood as the state of the hinge assembly 203 when the foldable electronic device 01 is in the flattened state shown in Figure 1; the folded state of the hinge assembly 203 shown in Figure 21 can be understood as the state of the hinge assembly 203 when the foldable electronic device 01 is in the folded state shown in Figure 2. For ease of understanding and explanation, Figures 20 and 21 also illustrate the third display area 130.

[0274] As can be seen in Figures 20 and 21 , the first driving portion D1 is located on a first side of the centerline O31 of the support portion 261, with the opening of the first driving portion D1 facing away from the centerline O31 of the support plate body 2610. The second driving portion D2 is located on a second side of the centerline O31 of the support portion 261, with the opening of the first driving portion D1 facing away from the centerline O31 of the support plate body 2610.

[0275] As shown in Figure 20, when the rotating shaft assembly 203 is in the flattened state, the first swing arm B1 and the second swing arm B2 rotate to the flattened position, the second end of the first swing arm B1 extends into the first driving part D1 through the opening of the first driving part D1 and is located between the first driving sub-part D11 and the second driving sub-part D12 of the first driving part D1, and the second end of the second swing arm B2 extends into the second driving part D2 through the opening of the second driving part D2 and is located between the first driving sub-part D21 and the second driving sub-part D22 of the second driving part D2; as shown in Figure 21, when the rotating shaft assembly 203 is in the folded state, the first swing arm B1 and the second swing arm B2 rotate to the folded position, the second end of the first swing arm B1 exits the first driving part D1 and is located on the side facing the opening of the first driving part D1, and the second end of the second swing arm B2 exits the second driving part D2 and is located on the side facing the opening of the second driving part D2.

[0276] It should be understood that as the first and second swing arms B1 and B2 rotate about the shaft base 210 from the flattened position shown in FIG. 20 toward the folded position shown in FIG. 21 , they contact the second driving sub-section D12 of the first driving unit D1 and the second driving sub-section D22 of the second driving unit D2, thereby applying a downward driving force to the second driving sub-section D12 of the first driving unit D1 and the second driving sub-section D22 of the second driving unit D2, driving the support portion 261 downward. Furthermore, as the first and second swing arms B1 and B2 rotate about the shaft base 210 from the folded position shown in FIG. 21 toward the flattened position shown in FIG. 20 , they contact the first driving sub-section D11 of the first driving unit D1 and the first driving sub-section D21 of the second driving unit D2, thereby applying an upward driving force to the first driving sub-section D11 of the first driving unit D1 and the first driving sub-section D21 of the second driving unit D2, driving the support portion 261 upward. This will be described in detail below with reference to FIG. 22 to FIG. 25 .

[0277] Please refer to Figures 22 and 23. Figure 22 is a first diagram showing a change of a rotating shaft assembly provided in an embodiment of the present application from a flattened state to an intermediate state to a folded state. Figure 23 is a second diagram showing a change of a rotating shaft assembly provided in an embodiment of the present application from a flattened state to an intermediate state to a folded state.

[0278] Among them, (a) in Figure 22 and (a) in Figure 23 correspond to the rotating shaft assembly 203 being in a flattened state; (b) in Figure 22 and (b) in Figure 23 correspond to the rotating shaft assembly 203 being in an intermediate state; (c) in Figure 22 and (c) in Figure 23 correspond to the rotating shaft assembly 203 being in a folded state.

[0279] It should be noted that Figure 22 illustrates the coordination between the swing arm and the pusher pawl in various states of the rotating shaft assembly 203. Figure 22 can be understood as a cross-sectional view of the rotating shaft assembly 203 in the flattened, intermediate, and folded states, taken along the same position along the section line X3-X3 as shown in Figure 7 . Figure 23 illustrates the corresponding states of the bistable mechanism 262 and the position of the support portion 261 in various states of the rotating shaft assembly 203. Figure 23 can be understood as a cross-sectional view of the rotating shaft assembly 203 in the flattened, intermediate, and folded states, taken along the same position along the section line X3-X3 as shown in Figure 7 . Furthermore, Figures 22 and 23 only depict a portion of the rotating shaft assembly 203 near the shaft seat 210. The structures depicted in Figures 22 and 23 should not be construed as limiting the components of the rotating shaft assembly 203. Furthermore, for ease of understanding and explanation, Figures 22 and 23 also illustrate the third bending region 133.

[0280] The process of the shaft assembly 203 moving from the flattened state to the intermediate state and toward the folded state is divided into two stages: the stage in which the shaft assembly 203 moves from the flattened state to the intermediate state, and the stage in which the shaft assembly 203 moves from the intermediate state to the folded state.

[0281] First, the stage in which the rotating shaft assembly 203 moves from the flattened state to the intermediate state is described.

[0282] The first swing arm B1 and the second swing arm B2 rotate about the shaft seat 210 from the flattened position shown in FIG. 22 (a) to the transition position shown in FIG. 22 (b). During this process, the second end of the first swing arm B1 and the second driving sub-section D12 of the first driving section D1 go from being in contact as shown in FIG. 22 (a) (when the rotating shaft assembly 203 is in the flattened state, the second end of the first swing arm B1 extends into the first driving section D1 and contacts the second driving sub-section D12; in other embodiments, no contact is required), until they are on the verge of being out of contact as shown in FIG. 22 (b). The second end of the second swing arm B2 and the second driving sub-section D22 of the second driving section D2 have the same mating relationship.

[0283] It should be noted that the first swing arm B1 and the second swing arm B2 provide downward driving force to the first driving part D1 and the second driving part D2 through their respective contact with the second driving sub-part D12 of the first driving part D1 and the second driving sub-part D22 of the second driving part D2. Under the action of this driving force, the moving block 2621 moves downward from the first stable state position shown in (a) of Figure 23 to the unstable equilibrium position shown in (b) of Figure 23 and drives the first flexible beam 2622 and the second flexible beam 2623 to deform to store elastic deformation energy. The flexible bistable mechanism 262 switches from the first stable state shown in (a) of Figure 23 to the unstable equilibrium state shown in (b) of Figure 23, and the support part 261 moves downward from the first position shown in (a) of Figure 23 to the third position shown in (b) of Figure 23.

[0284] Next, the stage in which the rotating shaft assembly 203 moves from the intermediate state to the folded state is described.

[0285] The first swing arm B1 and the second swing arm B2 rotate about the shaft seat 210 from the transition position shown in (b) of Figure 22 to the folded position shown in (c) of Figure 22. During this process, the second end of the first swing arm B1 and the second driving sub-section D12 of the first driving section D1 change from being on the verge of contact as shown in (b) of Figure 22 to being out of contact as shown in (c) of Figure 22 (when the rotating shaft assembly 203 is in the folded state). The second end of the second swing arm B2 has the same mating relationship with the first driving sub-section D21 of the second driving section D2.

[0286] It should be noted that the first swing arm B1 and the second swing arm B2 only need to provide a slight downward driving force in the intermediate state shown in (b) of Figure 22 to prompt the first flexible beam 2622 and the second flexible beam 2623 to release elastic deformation energy, and drive the moving block 2621 to move downward from the unstable equilibrium position shown in (b) of Figure 23 to the second stable position shown in (c) of Figure 23, so that the moving block 2621 drives the support part 261 to move downward from the third position shown in (b) of Figure 23 to the second position shown in (c) of Figure 23, so as to provide screen space for avoiding the third display area 130, and the flexible bistable mechanism 262 also switches from the unstable equilibrium state shown in (b) of Figure 23 to the second stable state shown in (c) of Figure 23.

[0287] It should be understood that the first compliant beam 2622 and the second compliant beam 2623 release elastic deformation energy, which will cause the first driving part D1 and the second driving part D2 arranged on the back side of the support part 261 to also move downward, so that the second end of the first swing arm B1 does not contact the second driving sub-part D12 of the first driving part D1 but contacts the first driving sub-part D11 of the first driving part D1, and the second end of the second swing arm B2 does not contact the second driving sub-part D22 of the second driving part D2 but contacts the first driving sub-part D21 of the second driving part D2.

[0288] Please refer to Figures 24 and 25. Figure 24 is a first diagram showing a change of a rotating shaft assembly provided in an embodiment of the present application from a folded state to an intermediate state to a flattened state. Figure 25 is a second diagram showing a change of a rotating shaft assembly provided in an embodiment of the present application from a folded state to an intermediate state to a flattened state.

[0289] It should be noted that Figure 24 illustrates the coordination between the swing arm and the pusher pawl in various states of the hinge assembly 203. Figure 24 can be understood as a cross-sectional view of the hinge assembly 203 in the folded, intermediate, and flattened states, taken along the same position as the section line X3-X3 shown in Figure 7 . Figure 25 illustrates the corresponding states of the bistable mechanism 262 and the position of the support portion 261 in various states of the hinge assembly 203. Figure 25 can be understood as a cross-sectional view of the hinge assembly 203 in the flattened, intermediate, and folded states, taken along the same position as the section line X3-X3 shown in Figure 7 . Furthermore, Figures 24 and 25 only depict a portion of the hinge assembly 203 near the shaft seat 210. The structures depicted in Figures 24 and 25 should not be construed as limiting the components of the hinge assembly 203. Furthermore, for ease of understanding and illustration, Figures 24 and 25 also depict a portion of the third display area 130.

[0290] The process of the rotating shaft assembly 203 moving from the folded state to the intermediate state and then to the flattened state is also divided into two stages: the stage in which the rotating shaft assembly 203 moves from the folded state to the intermediate state, and the stage in which the rotating shaft assembly 203 moves from the intermediate state to the flattened state.

[0291] First, the stage in which the rotating shaft assembly 203 moves from the folded state to the intermediate state is described.

[0292] The first swing arm B1 and the second swing arm B2 rotate about the shaft seat 210 from the flattened position shown in FIG. 24(a) to the transition position shown in FIG. 24(b). During this process, the second end of the first swing arm B1 and the first driving sub-section D11 of the first driving section D1 go from being out of contact as shown in FIG. 24(a) to being in near contact as shown in FIG. 24(b). The second end of the second swing arm B2 and the first driving section of the second driving section D2 have the same mating relationship.

[0293] During this process, the first swing arm B1 and the second swing arm B2 provide an upward driving force to the first driving part D1 and the second driving part D2 through their respective contact with the first driving sub-part D11 of the first driving part D1 and the first driving sub-part D21 of the second driving part D2. Under the action of this driving force, the moving block 2621 moves upward from the first stable position shown in (a) of Figure 25 to the unstable equilibrium position shown in (b) of Figure 25 and drives the first flexible beam 2622 and the second flexible beam 2623 to deform to store elastic deformation energy. The flexible bistable mechanism 262 switches from the first stable state shown in (a) of Figure 25 to the unstable equilibrium state shown in (b) of Figure 25, and the support part 261 moves upward from the first position shown in (a) of Figure 25 to the third position shown in (b) of Figure 25.

[0294] Next, the stage in which the rotating shaft assembly 203 moves from the intermediate state to the flattened state is described.

[0295] The first swing arm B1 and the second swing arm B2 rotate about the shaft seat 210 from the transition position shown in FIG. 24( b ) to the flattened position shown in FIG. 24( c ). During this process, the second end of the first swing arm B1 and the first driving sub-unit D11 of the first driving unit D1 go from being on the verge of contact as shown in FIG. 24( b ) to being out of contact as shown in FIG. 24( c ). The second end of the second swing arm B2 and the first driving sub-unit D21 of the second driving unit D2 have the same mating relationship.

[0296] It should be noted that the first swing arm B1 and the second swing arm B2 only need to provide a slight upward driving force in the intermediate state shown in Figure 24 (b) to cause the first compliant beam 2622 and the second compliant beam 2623 to release elastic deformation energy, driving the moving block 2621 to move upward from the unstable equilibrium position shown in Figure 25 (b) to the first stable state position shown in Figure 25 (c). As a result, the moving block 2621 drives the support portion 261 to move upward from the third position shown in Figure 25 (b) to the first position shown in Figure 25 (c) to support the third display area 130. The flexible bistable mechanism 262 also switches from the unstable equilibrium state shown in Figure 25 (b) to the first stable state shown in Figure 25 (c).

[0297] It should be understood that the release of elastic deformation energy by the first compliant beam 2622 and the second compliant beam 2623 will cause the first driving part D1 and the second driving part D2 arranged on the back side of the support part 261 to also move upward, so that the second end of the first swing arm B1 does not contact the first driving sub-part D11 of the first driving part D1 but contacts the second driving sub-part D12 of the first driving part D1, and the second end of the second swing arm B2 does not contact the first driving sub-part D21 of the second driving part D2 but contacts the second driving sub-part D22 of the second driving part D2.

[0298] As can be seen from the above, please continue to refer to Figures 20 and 21. Different from the floating support plate 230 shown in Figures 4 and 5, the bistable support plate 260 shown in Figures 20 and 21 is driven differently. In Figures 20 and 21, when the rotating shaft assembly 203 moves from the flattened state shown in Figure 20 to the folded state shown in Figure 21, the bistable support plate 260 is first driven downward by the driving force provided by the first swing arm B1 and the second swing arm B2, so that the support portion 261 of the bistable support plate 260 moves from the first position shown in Figure 20 to the third position; thereafter, the first swing arm B1 and the second swing arm B2 apply a slight downward disturbance, and the support portion 261 can automatically move to the second position shown in Figure 21 by relying on the elastic deformation generated by the deformation of the above-mentioned bistable mechanism 262 (not shown in the figure due to being blocked) of the bistable support plate 260, and is stabilized in the second position shown in Figure 21 by relying on the self-stable characteristics of the bistable support plate 260 (specifically, the second stable state of the bistable mechanism 262) without the need for external force.

[0299] On the contrary, when the rotating shaft assembly 203 moves from the folded state shown in Figure 21 to the flattened state shown in Figure 20, the bistable support plate 260 is first driven upward by the driving force provided by the first swing arm B1 and the second swing arm B2, so that the support portion 261 of the bistable support plate 260 moves from the second position shown in Figure 21 to the third position; thereafter, the first swing arm B1 and the second swing arm B2 apply a slight upward disturbance, and the support portion 261 of the bistable support plate 260 can automatically move to the first position shown in Figure 20 by relying on the elastic deformation generated by the deformation of the above-mentioned bistable mechanism 262 (not shown in the figure due to being blocked), and stabilize at the first position shown in Figure 20 by relying on the self-stable characteristics of the bistable support plate 260 (specifically, the first stable state of the bistable mechanism 262) without the need for external force.

[0300] In short, in the bistable support plate 260 shown in Figures 20 and 21, the support portion 261 can move between the first position shown in Figure 20 and the second position shown in Figure 21 under the drive of the first swing arm B1 and the second swing arm B2 and the effect of its own mechanical properties, without the need for the screw 233 and spring 234 shown in Figures 4 and 5 to provide elastic force to assist its downward movement. In this case, the shaft seat 210 shown in Figures 20 and 21 no longer has the groove 212 for accommodating the nut of the screw 233 and the spring 234 shown in Figures 4 and 5.

[0301] It should be noted that because the bistable support plate 260 relies on its own stable properties to stabilize the support portion 261 in the first position shown in FIG. 20 without requiring external force, when the rotating shaft assembly 203 is in the flattened state shown in FIG. 20 , the bistable support plate 260 can stabilize the support portion 261 in the first position shown in FIG. 20 , without requiring the support of the first swing arm B1 and the second swing arm B2, thereby supporting the third bending zone 133. As can be seen in FIG. 20 , there is no contact between the first swing arm B1 and the first driving sub-portion D11 of the first driving portion D1, and there is no contact between the second swing arm B2 and the first driving sub-portion D21 of the second driving portion D2. Therefore, the first swing arm B1 and the second swing arm B2 do not provide support to the bistable support plate 260.

[0302] Please continue to refer to (b) in Figure 24. It should be noted that in (b) in Figure 24, there is a gap H21 between the second end of the first swing arm B1 and the second driving sub-part D12 of the first driving part D1, and there is a gap H22 between the second end of the second swing arm B2 and the second driving sub-part D22 of the second driving part D2.

[0303] When the first swing arm B1 and the second swing arm B2 provide a slight upward driving force in the intermediate state shown in (b) of Figure 24, the elastic deformation energy released by the first and second compliant beams 2622 and 2623 causes the first and second drive parts D1 and D2 shown in (b) of Figure 24 to rapidly move upward, causing the first drive sub-part D11 of the first drive part D1 and the first drive sub-part D21 of the second drive part D2 to separate from the second end of the first swing arm B1 and the second end of the second swing arm B2, and to contact the second end of the first and second swing arms B1 and B2, respectively. The presence of gaps H21 and H22 makes it easy for abnormal noise to be emitted during contact. It should be understood that the rotating shaft assembly 203 shown in (b) of Figure 22 also has the problem of abnormal noise, which can be understood by reference.

[0304] In order to solve the problem of abnormal noise during the movement of the bistable support plate 260, in some embodiments of the present application, the gap H21 and the gap H22 in (b) of Figure 24 are less than the first preset threshold. The gap H11 and the gap H12 in (b) of Figure 22 are less than the second preset threshold. For example, the value range of the first preset threshold and the second preset threshold can be 0.02mm to 0.05mm, such as 0.02mm, 0.03mm, 0.04mm, and 0.05mm. The first preset threshold and the second preset threshold can be the same or different.

[0305] In this embodiment, by limiting each gap within a certain range, the movement path of the first drive part D1 and the second drive part D2 is shorter, and the impact force when the first drive part D1 and the second drive part D2 respectively contact the second end of the first swing arm B1 and the second end of the second swing arm B2 is smaller, and the abnormal noise is smaller.

[0306] Alternatively, referring to FIG. 26 , the aforementioned gaps can be zero, i.e., there is no gap. In this manner, when the second ends of the first swing arm B1 and the second swing arm B2 are just clear of the second driving sub-section D12 of the first driving unit D1 and the second driving sub-section D22 of the second driving unit D2, they are in contact with the first driving sub-section D11 of the first driving unit D1 and the first driving sub-section D21 of the second driving unit D2, resulting in a shorter motion path, less impact force, and less abnormal noise.

[0307] Continuing with reference to FIG15 , FIG15 illustrates a drive mechanism 263 comprising a first drive unit D1 and a second drive unit D2 spaced apart in the X-axis direction and located on either side of the centerline O32 of the support portion 261. In this case, the first drive unit D1 is driven by the first swing arm B1 shown in FIG20 and FIG21 , and the second drive unit D2 is driven by the second swing arm B2 shown in FIG20 and FIG21 . In other words, the drive mechanism 263 is driven by the first swing arm B1 and the second swing arm B2. The first drive unit D1 and the second drive unit D2 are located at two separate locations in the X-axis direction. Thus, when the first swing arm B1 and the second swing arm B2 drive the first drive unit D1 and the second drive unit D2, respectively, the force applied to the support portion 261 in the X-axis direction is more dispersed and uniform, and the movement of the support portion 261 is more stable.

[0308] Since the first driving part D1 and the second driving part D2 are located on both sides of the center line O31 of the support part 261, when the driving force acts on the first driving part D1 and the second driving part D2, both sides of the support part 261 along the X-axis direction will be driven by the driving force, which makes the force on the support part 261 along the X-axis direction more uniform, thereby making the movement process of the support part 261 smoother.

[0309] Of course, in other embodiments, the driving mechanism 263 may also only include a first driving part D1 located on the first side of the center line O31 of the support part 261, or only include a second driving part D2 located on the second side of the center line O31 of the support part 261. In this case, the driving mechanism 263 is only driven by the first swing arm B1 or the second swing arm B2.

[0310] Continuing with FIG15 , the first driving unit D1 and the second driving unit D2 can optionally be symmetrically distributed on either side of the center line O32 of the support portion 261, with the center line O32 of the support portion 261 as the axis. This allows the support portion 261 to be subjected to a more uniform force along the X-axis, resulting in a smoother movement of the support portion 261.

[0311] In this embodiment, a first drive unit D1 and a second drive unit D2 that are axially symmetrically distributed are referred to as a drive unit pair D. Of course, in other embodiments, the first drive unit D1 and the second drive unit D2 included in a drive unit pair D may not be axially symmetrically distributed, for example, they may be offset by one end in the Y-axis direction. As shown in FIG15 , region Q of the bistable support plate 260 shown in FIG15 is provided with two drive unit pairs D distributed along the Y-axis direction and a compliant bistable mechanism 262 located between the two drive unit pairs D.

[0312] One set of drive unit pairs D is arranged on the first side of the compliant bistable mechanism 262; the other set of drive unit pairs D is arranged on the second side of the compliant bistable mechanism 262. The first side and the second side of the compliant bistable mechanism 262 refer to the two sides of the compliant bistable mechanism 262 distributed along the Y-axis direction. In this way, when the driving force acts on the two sets of drive unit pairs D, the compliant bistable mechanism 262 is driven by the driving force on both sides along the Y-axis direction, which makes the force applied to the compliant bistable mechanism 262 more uniform, thereby making the process of the compliant bistable mechanism 262 driving the support part 261 to move more smoothly. Optionally, the two sets of drive unit pairs D are symmetrically distributed on both sides of the compliant bistable mechanism 262. In this way, the process of the compliant bistable mechanism 262 driving the support part 261 to move more smoothly.

[0313] It should be understood that in other embodiments, the drive mechanism 263 may also include only one set of drive unit pairs D. In addition, it is worth noting that in FIG15 , the two sets of drive unit pairs D are adjacent to the compliant bistable mechanism 262 , but in other embodiments, the two sets of drive unit pairs D may not be adjacent to the compliant bistable mechanism 262 .

[0314] Continuing with Figure 14, Figure 14 shows four regions Q. In conjunction with Figure 15, each region Q includes a set of drive mechanisms 263 and a compliant bistable mechanism 262. This means that the bistable support plate 260 shown in Figure 14 includes four compliant bistable mechanisms 262 and four sets of drive mechanisms 263. The four compliant bistable mechanisms 262 are spaced apart along the Y-axis, for example, at equal intervals, on the back side of the support portion 261. The four sets of drive mechanisms 263 are spaced apart along the Y-axis, for example, at equal intervals, on the back side of the support portion 261.

[0315] In this embodiment, the four sets of drive mechanisms 263 and the four compliant bistable mechanisms 262 are spaced apart along the Y-axis on the support portion 261. Thus, when a driving force acts on the multiple sets of drive mechanisms 263, the four positions of the support portion 261 along the Y-axis are all driven by the driving force, which makes the force applied to the support portion 261 along the Y-axis more uniform, thereby making the movement of the support portion 261 smoother.

[0316] It should be understood that in other embodiments, the number of compliant bistable mechanisms 262 and the number of drive mechanisms 263 can be greater or less, and this embodiment of the present application does not specifically limit this. Furthermore, the number of compliant bistable mechanisms 262 and the number of drive mechanisms 263 can be the same or different.

[0317] It should be noted that since the bistable support plate 260 shown in FIG14 is provided with four sets of drive mechanisms 263, the corresponding number of first swing arms B1 and second swing arms B2 used to drive the drive mechanisms 263 may also be provided. For ease of description, the first swing arms B1 and second swing arms B2 are referred to as swing arm pairs. The number of swing arm pairs and the number of drive mechanisms 263 may be the same, with one swing arm pair correspondingly driving one drive mechanism 263.

[0318] For example, please continue to refer to Figure 27, which is a schematic three-dimensional structural diagram of the rotating shaft assembly shown in Figure 7, taken along the section line X3-X3 shown in Figure 14. It can be understood that the state shown in Figure 27 corresponds to the flattened state of the rotating shaft assembly. As can be seen in Figure 27, a region P1 includes a pair of swing arms B and a corresponding set of drive mechanisms 263.

[0319] Among them, the two first driving parts D1 in the two driving part pairs D included in a set of driving mechanisms 263 are jointly driven by a first swing arm B1, and the two second driving parts D2 in the two driving part pairs D included in a set of driving mechanisms 263 are jointly driven by a second swing arm B2.

[0320] In this case, the second end of the first swing arm B1 and the second end of the second swing arm B2 have two terminals distributed along the Y-axis. One terminal of the first swing arm B1 extends into one of the first drive parts D1 to facilitate driving one of the first drive parts D1; ​​the other terminal of the first swing arm B1 extends into the other first drive part D1 to facilitate driving the other first drive part D1. It should be understood that the positional relationship between the two terminals of the second swing arm B2 and the two second drive parts D2 can be understood by reference.

[0321] It should be noted that, in other embodiments, the first swing arm B1 can also be split into two independent parts to drive the two first driving parts D1 separately. In this case, a set of swing arm pairs B includes two first swing arms B1 and two second swing arms B2.

[0322] Based on this, there are four areas P in Figure 7, which means that the rotating shaft assembly 203 shown in Figure 7 includes four groups of swing arm pairs B shown in Figure 27 and four groups of drive mechanisms 263 shown in Figure 27. The four groups of drive mechanisms 263 are arranged on the support portion 261 at intervals along the Y-axis direction, for example, distributed at equal intervals. The four groups of swing arm pairs B are arranged on the shaft seat at intervals along the Y-axis direction (the shaft seat in Figure 7 is blocked by the bistable support plate 260), for example, distributed at equal intervals. It should be understood that in other embodiments, the number of groups of swing arm pairs B can be more or less, and the embodiments of the present application do not make specific limitations on this.

[0323] In some embodiments of the present application, referring to FIG. 14 , the bistable support plate 260 shown in FIG. 14 is an integrally formed structure. The so-called integrally formed structure means that the components of the bistable support plate 260 are integrated, rather than being separate parts. The integrally formed structure of the bistable support plate 260 reduces the number of parts and simplifies the assembly process.

[0324] For example, please refer to Figure 15 and Figure 28. Figure 28 is a schematic exploded view of a portion of a bistable support plate according to an embodiment of the present application. The components of the bistable support plate 260 shown in Figure 28 include a support plate body 2610, a bistable mechanism 262, and two sets of drive member pairs D0. The two sets of drive member pairs D0 are located on either side of the bistable mechanism 262 in the Y-axis direction. This embodiment is described using a set of drive member pairs D0 located on the positive side of the Y-axis as an example, and the other set of drive member pairs D0 is implemented similarly.

[0325] A driver pair D0 includes two drivers: a first pusher claw D10 and a second pusher claw D20. The first pusher claw D10 and the second pusher claw D20 are spaced apart along the width of the support plate body 2610 (i.e., the X-axis direction) and are connected to the back side of the support plate body 2610, forming the first and second drive parts D1 and D2, respectively, as shown in Figure 15. The support plate body 2610 also forms the support portion 261, shown in Figure 15.

[0326] Specifically, the first and second shifter fingers D10 and D20 each include a first actuation region, a connection region, and a second actuation region. To facilitate differentiation, the present embodiment labels the components of the first and second shifter fingers D10 and D20 with different numbers. The first shifter finger D10 includes a first actuation region D101, a connection region D102, and a second actuation region D103; the second shifter finger D20 includes a first actuation region D201, a connection region D202, and a second actuation region D203.

[0327] The support plate body 2610 may include a support area 2611 and two third drive areas, namely a third drive area D14 and a third drive area D24, which are respectively located on either side of the support area 2611. It should be understood that the support area 2611 is the portion of the support plate body 2610 excluding the third drive areas D14 and D24. The support area 2611 is used to form the support portion 261 shown in Figure 15. For example, the structure formed by filling the injection molding groove 261a of the support area 2611 with plastic forms the support portion 261.

[0328] The connection area D102 forms the connection portion D12 shown in Figure 15 , while the connection area D202 forms the connection portion D22 shown in Figure 15 . The second drive area D103 forms the second drive sub-section D13 shown in Figure 15 , while the second drive area D203 forms the second drive sub-section D23 shown in Figure 15 . For example, the connection area D102 forms the connection portion D12, the connection area D202 forms the connection portion D22, the second drive area D103 forms the second drive sub-section D13, and the second drive area D203 forms the second drive sub-section D23. The first drive area D101 and the third drive area D14 of the first pusher finger D10 are stacked and connected to form the first drive sub-section D11 of the first drive section D1 shown in Figure 15 ; the first drive area D201 and the third drive area D24 of the second pusher finger D20 are stacked and connected to form the first drive sub-section D21 of the second drive section D2 shown in Figure 15 .

[0329] That is, in the embodiment shown in Figure 28 , the support portion 261 is implemented by a portion of the support plate body 2610, the first driving portion D1 is implemented by a portion of the support plate body 2610 and the first pusher claw D10, and the second driving portion D2 is implemented by a portion of the support plate body 2610 and the second pusher claw D20. It should be understood that in other embodiments, the support portion 261, the first driving portion D1, and the second driving portion D2 may be implemented in other ways, and Figure 28 is merely an example. For example, the first driving sub-portion D11 of the first driving portion D1 may be implemented solely by the first pusher claw D10, and the first driving sub-portion D21 of the second driving portion D2 may be implemented solely by the second pusher claw D20.

[0330] In Figure 28, the support plate body 2610, the first shifter claw D10, the second shifter claw D20, and the bistable mechanism 262 are formed into an integrally formed structure through an integral molding process, thereby obtaining the bistable support plate 260 shown in Figure 14. The material selection and integral molding process of the various components of the bistable support plate 260 are described below.

[0331] First, the material selection of each component in the bistable support plate 260 is exemplified.

[0332] The support plate body 2610 has the function of supporting the screen. Its shape is long and narrow, requiring the support plate body 2610 to have good strength and flatness. Based on this, the material selection of the support plate body 2610 can be one of the following methods:

[0333] Method 1: Using carbon fiber for the support plate body 2610. Due to the lightweight nature of carbon fiber, while still meeting the strength and flatness requirements of the support plate body 2610, using carbon fiber for the support plate body 2610 can reduce the weight of the bistable support plate 260, thereby reducing the overall weight of the foldable electronic device 01.

[0334] Method 2: The support plate body 2610 is constructed of stainless steel sheet, covered with plastic. Compared to carbon fiber sheet, a stainless steel support plate body 2610 is stronger, more impact-resistant, and less susceptible to damage. Furthermore, considering that a stainless steel support plate body 2610 is heavier than a carbon fiber support plate body 2610 of the same thickness, using Method 2 can enhance the strength of the support plate body 2610 while reducing its weight.

[0335] For example, the material of the stainless steel sheet may be, but is not limited to, one of the following materials: SUS201, SUS301-1 / 2H, SUS301-H, SUS301-EH, SUS301-3 / 4H, SUS301-SHE, SUS304, SUS420, SUS430, etc.

[0336] For example, the material of the plastic may be, but is not limited to, one of the following materials: PA, PEI, PEEK, SPR (PR-250), POM, POM+GF10, PA+GF55, PA66+GF, etc.

[0337] Method 3: The support plate body 2610 is made of pure metal sheet. Similarly, compared with the carbon fiber board, the presence of the pure metal sheet makes the support plate body 2610 stronger, more resistant to impact, and less likely to be damaged.

[0338] For example, the material of the pure metal sheet may be, but is not limited to, one of the following materials: zirconium-based amorphous alloy, high-strength aluminum, titanium alloy, stainless steel, high-strength MIM steel, etc.

[0339] The compliant bistable mechanism 262 needs to be deformable and has fatigue life requirements. Therefore, the compliant bistable mechanism 262 can be made of a metal material with good toughness, such as SUS403 (stainless steel), SUS301-H (stainless steel), SUS301-EH (stainless steel), SUS301-SHE (stainless steel), zirconium-based amorphous alloy, high-strength MIM steel, 60Si2Mn (silicon manganese steel), 55CrSi (silicon steel), or 65Mn (manganese steel).

[0340] The first and second shifter fingers D10 and D20 work with the main heel swing arm, which drives their movement. This requires them to withstand a certain amount of force, which requires them to be strong. Therefore, they can be made of high-strength metal materials such as SUS403 (stainless steel), SUS301-H (stainless steel), SUS301-EH (stainless steel), SUS301-SHE (stainless steel), zirconium-based amorphous alloys, 60Si2Mn (silicon-manganese steel), 55CrSi (silicon steel), 65Mn (manganese steel), or high-strength MIM steel.

[0341] Next, the integral molding process of the bistable support plate 260 is exemplarily described.

[0342] It should be noted that the molding method of the bistable support plate 260 is related to the material selection of the support plate body 2610, the flexible bistable mechanism 262, the first shifter claw D10 and the second shifter claw D20. The following discusses the following cases:

[0343] Case 1: Referring to FIG. 29 , the support plate body 2610 is made of carbon fiber, and the compliant bistable mechanism 262 , the first shifting claw D10 , and the second shifting claw D20 are all made of metal.

[0344] One-piece molding process: First, the support plate body 2610 is formed using carbon fiber hot pressing. The compliant bistable mechanism 262, first and second fingers D10, D20 are molded using methods such as wire cutting, CNC machining, or metal injection molding (MIM). The structure of each component can be adapted with reference to the example in FIG27 . Then, the compliant bistable mechanism 262, first and second fingers D10, D20, and support plate body 2610 are positioned. Finally, the compliant bistable mechanism 262, first and second fingers D10, D20, and support plate body 2610 are integrated using a plastic injection molding process to obtain the bistable support plate 260. This one-piece molding process only illustrates the main steps for obtaining the bistable support plate 260. Specific implementations may include additional steps, which are not limited in this embodiment.

[0345] It should be noted that due to the different materials of the support plate body 2610, the compliant bistable mechanism 262, and the first and second fingers D10 and D20, welding is not feasible for securing the support plate body 2610 to the compliant bistable mechanism 262, nor for securing the support plate body 2610 to the first and second fingers D10 and D20. Therefore, plastic injection molding is employed to achieve an integrated structure. This is explained below with reference to Figures 29 and 30.

[0346] For example, please refer to Figure 29, which illustrates the connection between the support plate body 2610 and the first shifter claw D10 according to some embodiments of the present application. Figure 29 illustrates the details of the plastic adhesive bonding connection between the first shifter claw D10 and the support plate body 2610. The details of the plastic adhesive bonding connection between the second shifter claw D20 and the support plate body 2610 can be similarly implemented.

[0347] As shown in the structure framed by area N2 in Figure 29, the support plate body 2610's third drive zone D14, located on the first side of the centerline O32, is stacked in the Z-axis direction with the first pusher finger D10, also located on the first side of the centerline O32. It should be understood that positioning the first pusher finger D10 properly means stacking the first drive zone D101 of the first pusher finger D10 below the third drive zone D14 of the support plate body 2610. By connecting the third drive zone D14 and the first drive zone D101 of the first pusher finger D10, the first pusher finger D10 is secured to the back side of the support plate body 2610. In Figure 29, the third drive zone D14 and the first drive zone D101 of the first pusher finger D10 are connected using a plastic adhesive bond.

[0348] Specifically, referring to region N2 shown in Figure 29, region N2 comprises four layers, from top to bottom along the Z-axis: first layer M1—plastic (i.e., the first plastic layer); second layer M2—third drive area D14; third layer M3—first drive area D101; and fourth layer M4—plastic (i.e., the second plastic layer). The third drive area D14 and the first drive sub-unit D11 are sandwiched between the first and fourth layers M1, M4. Furthermore, referring to Figure 28, a through-hole K1 is provided in the first drive area D101, and a through-hole K2 is provided in the third drive area D14. When the first finger D10 is in place, Figure 29 shows that through-hole K1 and through-hole K2 are connected, and plastic is also poured into through-holes K1 and K2. In FIG29 , the plastic of the first layer M1 and the fourth layer M4 are pulled together with the plastic poured into the through holes K1 and K2, thereby pulling the third driving area D14 and the first driving area D101 together, so that the third driving area D14 and the first driving area D101 of the first finger D10 are connected by plastic pulling.

[0349] Of course, in other embodiments, the third drive area D14 and the first drive area D101 can also be connected by other plastic bonding methods or other plastic connection methods. In addition, the first finger D10 and the support plate body 2610 can also be fixed by other methods, which are not limited in this embodiment of the application.

[0350] For example, please refer to Figure 30, which is a cross-sectional view taken along the section line Y1-Y1 shown in Figure 29. This figure shows the details of the connection between the compliant bistable mechanism 262 and the support plate body 2610 through plastic adhesive bonding.

[0351] In order to center the compliant bistable mechanism 262 on the back side of the support plate body 2610, in conjunction with Figure 28, an injection molding groove 261a is provided on the front side of the support area 2611, and the injection molding groove 261a is located in the area directly opposite the moving block 2621. The injection molding groove 261a is located in the area directly opposite the moving block 2621, which means that the projection of the injection molding groove 261a on the moving block 2621 along the Z-axis direction covers the moving block 2621, for example, just overlaps or exceeds the boundary of the moving block 2621. Four through holes K3 are provided at the bottom of the injection molding groove 261a (only one is marked in the figure), and four through holes K4 are provided on the moving block 2621 of the compliant bistable mechanism 262 (only one is marked in the figure). It should be understood that in other embodiments, the number of through holes K3 and through holes K4 can be more or less, and the embodiments of the present application are not limited to this.

[0352] When the compliant bistable mechanism 262 is in place, as shown in FIG30 , the through-holes K3 and K4 are connected to the injection groove 261a, and the plastic 264 is poured into the through-holes K3, K4, and the injection groove 261a. The plastic 264 poured into the through-holes K3, K4, and the injection groove 261a is integrated, thereby pulling the support area 2611 and the moving block 2621 together, so that the compliant bistable mechanism 262 and the support plate body 2610 are connected by the plastic glue. It should be understood that the compliant bistable mechanism 262 is in place, that is, the moving block 2621 of the compliant bistable mechanism 262 is stacked below the injection groove 261a of the support area 2611. As can be seen above, the portion of plastic 264 located within through-holes K3 and K4 passes through support area 2611 and movable block 2621. The portion of plastic 264 located within injection groove 261a is located directly opposite support area 2611, and these two portions of plastic are connected together. Furthermore, because injection groove 261a is located directly opposite movable block 2621, the portion of plastic 264 located within injection groove 261a is also located directly opposite movable block 2621.

[0353] In some embodiments, referring to FIG31 , which illustrates the structure of the compliant bistable mechanism 262, first shifter claw D10, and second shifter claw D20 in FIG28 after being flipped over, two injection molding grooves 2621a are provided on the back side of the movable block 2621. One of the injection molding grooves 2621a is connected to two through-holes K4 distributed along the Y-axis, and the other injection molding groove 2621a is connected to two other through-holes K4 distributed along the Y-axis. It should be understood that in other embodiments, the number of injection molding grooves 2621a may be greater or lesser, and the connection between the injection molding grooves 2621a and the through-holes K4 may be in other ways, which are not limited in this embodiment of the present application. Thus, the plastic 264 shown in FIG30 is also poured into the injection molding grooves 2621a shown in FIG31 , thereby further securing the movable block 2621 to the back side of the support plate body 2610 shown in FIG30 .

[0354] It should be understood that in other embodiments, the support area 2611 and the movable block 2621 may be connected by other plastic adhesive bonding methods. Furthermore, the support area 2611 and the movable block 2621 may also be fixed by other methods, which are not limited in this embodiment of the present application.

[0355] It should be noted, referring to Figure 29 , that due to the lightweight nature of carbon fiber, the support plate body 2610 shown in Figure 29 can be made of carbon fiber sheets. While meeting thickness requirements, the resulting support plate body 2610 is also lightweight, eliminating the need for plastic to balance the weight. Therefore, as can be seen in Figure 29 , during plastic injection molding, plastic only needs to be injected at the locations shown in Figure 29 where connections are required. The shaded areas in the figure indicate the distribution of the plastic.

[0356] It should be noted that the decomposed structure of the bistable support plate 260 shown in FIG28 is the decomposed structure of the bistable support plate 260 manufactured corresponding to the above-mentioned case 1, and the subsequent cases 2 and 3 can be adaptively understood by reference.

[0357] Case 2: Referring to FIG. 32 , the support plate body 2610 is made of stainless steel sheet, and the compliant bistable mechanism 262 , the first shifting claw D10 and the second shifting claw D20 are all made of metal.

[0358] One-piece molding process: First, the stainless steel sheet, the compliant bistable mechanism 262, the first and second fingers D10, D20 are formed using methods such as wire cutting, CNC machining, or MIM. Then, the compliant bistable mechanism 262, the first and second fingers D10, D20, and the stainless steel sheet are positioned. Finally, the compliant bistable mechanism 262, the first and second fingers D10, D20, and the stainless steel sheet are integrated using a plastic injection molding process to form the bistable support plate 260. This one-piece molding process only illustrates the key steps involved in forming the bistable support plate 260. Implementation may include additional steps, which are not limited in this embodiment.

[0359] For example, please refer to Figure 32, which is a schematic diagram illustrating the connection between the support plate body 2610 and the first shifter claw D10 according to other embodiments of the present application. Figure 32 illustrates the details of the connection between the first shifter claw D10 and the support plate body 2610 via a plastic adhesive bonding method. For details, please refer to Figure 29 for the detailed description of the connection between the first shifter claw D10 and the support plate body 2610 via a plastic adhesive bonding method, which will not be repeated here. It should be understood that the details of the connection between the second shifter claw D20 and the support plate body 2610 via a plastic adhesive bonding method can be similarly implemented.

[0360] Unlike Figure 29 , in Figure 32 , the first layer M1 of plastic is distributed across the entire upper surface of the stainless steel sheet, with the shaded portion of the figure illustrating the distribution of the plastic. It should be understood that the support area 2611 is a portion of the stainless steel sheet. Therefore, the plastic distributed across the entire upper surface of the stainless steel sheet naturally also extends across the upper surface of the support area 2611 and is located directly to the front of the support area 2611. Of course, in other embodiments, the fourth layer M4 of plastic can also be distributed across the entire lower surface of the stainless steel sheet, forming a support plate body 2610 with the plastic embedded within the stainless steel sheet. This is not a limitation in the present embodiment.

[0361] For example, please refer to Figure 33, which is a cross-sectional view taken along the section line Y2-Y2 shown in Figure 32. This figure shows the details of the connection between the compliant bistable mechanism 262 and the support plate body 2610 by plastic gluing. For details, please refer to Figure 30 for the detailed description of the connection between the compliant bistable mechanism 262 and the support plate body 2610 by plastic gluing, which will not be repeated here.

[0362] Different from FIG30 , since the upper surface of the stainless steel sheet needs to be covered with plastic, the injection groove 261a shown in FIG30 is no longer provided in FIG33 , and the plastic 264 is distributed over the entire surface of the stainless steel sheet 2610a.

[0363] It should be understood that in other embodiments, since the stainless steel sheet, the compliant bistable mechanism 262, the first and second shifter fingers D10, D20 are all made of metal, the stainless steel sheet and the compliant bistable mechanism 262, as well as the stainless steel sheet and the first and second shifter fingers D10, D20, can be connected by welding, sintering, or other metal connection methods. Therefore, for the second scenario, the stainless steel sheet and the compliant bistable mechanism 262, as well as the first and second shifter fingers D10, D20, can also be integrated by welding, sintering, or other metal connection methods.

[0364] Case 3: Referring to FIG. 34 and FIG. 35 , the support plate body 2610 is made of pure metal sheet, and the compliant bistable mechanism 262 , the first shifting claw D10 and the second shifting claw D20 are made of metal.

[0365] Integrated Molding Process Route 1: Referring to Figure 34 , the compliant bistable mechanism 262, the pure metal sheet, the first and second fingers D10, D20 are first formed by wire cutting, CNC machining, or MIM. The compliant bistable mechanism 262, the pure metal sheet 2610b, the first and second fingers D10, D20 are then welded together to form a single piece, yielding the bistable support plate 260.

[0366] For example, please refer to FIG. 34 , which is a schematic structural diagram of the connection between the support plate body 2610 and the first shifter claw D10 , the second shifter claw D20 and the compliant bistable mechanism 262 provided in some embodiments of the present application.

[0367] As shown in Figure 34 , the connections between the third drive area D14 of the support plate body 2610 (i.e., the pure metal sheet 2610b) and the first drive area D101 of the first finger D10, as well as between the support plate body 2610 and the movable block 2621 of the compliant bistable mechanism 262, are achieved by welding. For example, point-to-point welding is achieved by penetration welding. Figure 34 illustrates the connection between the various structures using weld points. It should be understood that because the connections are achieved by welding rather than by plastic bonding, the components in this embodiment do not have the through-holes and injection molding slots shown in Figures 28 and 31.

[0368] It should be noted that the meaning of the first shifter claw D10, the second shifter claw D20, the compliant bistable mechanism 262 and the pure metal sheet 2610b being in place can be adaptively referred to the relevant descriptions in FIG. 29 and FIG. 30 .

[0369] Integrated Molding Process Route 2: Referring to Figure 35 , the compliant bistable mechanism 262, the first and second shifter fingers D10 and D20, and the pure metal sheet 2610b are first formed by wire cutting, CNC machining, or MIM. The compliant bistable mechanism 262, the pure metal sheet 2610b, the first and second shifter fingers D10 and D20 are then positioned and integrated using the MIM process to form the bistable support plate 260.

[0370] For example, please refer to FIG. 35 , which is a schematic structural diagram of the connection between the support plate body 2610 and the first shifter claw D10 , the second shifter claw D20 and the compliant bistable mechanism 262 provided in other embodiments of the present application.

[0371] As shown in Figure 35 , the connections between the first driver sub-section D11 of the support plate body 2610 (i.e., the pure metal sheet 2610b) and the connecting portion D13 of the first pusher claw D10, as well as between the support plate body 2610 (i.e., the pure metal sheet 2610b) and the moving block 2621 of the compliant bistable mechanism 262, are all achieved using MIM. In Figure 35 , the various structures appear to be fused together, with no distinct boundaries, resulting in a more aesthetically pleasing surface finish. It should be understood that because the connections are achieved using MIM rather than plastic bonding, the components in this embodiment no longer have the through-holes and injection molding slots shown in Figures 28 and 31 .

[0372] The assembly process of the bistable support plate 260 is described below with reference to FIG. 36 .

[0373] Please refer to Figure 36, which is a schematic diagram of the assembly process of the bistable support plate provided in an embodiment of the present application.

[0374] First, as shown in FIG36(a), the first swing arm B1 and the second swing arm B2 are rotated to a certain angle to hover, presenting the hovering state shown in FIG36(a). Then, the bistable support plate 260 is moved from top to bottom along the Z-axis direction (in the direction of the arrow in the figure) until, as shown in FIG36(b), the bistable support plate 260 is fixed to the first mounting platform 214214 and the second mounting platform 215 of the shaft seat 210 by the first fixing block 2624 and the second fixing block 2625, respectively, and stops moving. Optionally, finally, as shown in FIG36(c), the bistable support plate 260 is welded to the shaft seat 210 using laser welding along the bold path shown in the figure.

[0375] It should be noted that in (a) of Figure 36, the angle at which the first swing arm B1 and the second swing arm B2 are suspended is based on the fact that the second ends of the first swing arm B1 and the second swing arm B2 will not block the first driving sub-part D11 of the first finger D10 and the second driving sub-part D22 of the second finger D20 of the bistable support plate 260 moving downward.

[0376] Obviously, compared with the floating support plate 230 shown in Figure 5, since the above-mentioned bistable support plate 260 is an integrally formed structure, the number of parts is smaller, and the assembly process does not involve the disassembly and assembly of the parts of the bistable support plate 260 itself, the assembly process is simpler.

[0377] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any modifications or substitutions that can be readily conceived by a person skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A multi-stable support plate, which is applied to a foldable electronic device, and is characterized in that The multi-stable support plate includes: A support portion; A multi-stable mechanism disposed on the back side of the support portion; the state of the multi-stable mechanism includes at least a first stable state and a second stable state; the multi-stable mechanism is configured to switch states under the drive of a driving force to drive the support portion to move; Wherein, when the multi-stable mechanism is in the first stable state, the support portion moves to a first position to support the foldable display screen of the foldable electronic device; when the multi-stable mechanism is in the second stable state, the support portion moves to a second position to provide a screen accommodation space to avoid the foldable display screen.

2. The multi-stable support plate according to claim 1, wherein The multi-stable mechanism is a bistable mechanism, and the bistable mechanism includes a compliant beam; One end of the compliant beam is connected to the back side of the support portion, and the other end of the compliant beam is fixed in the rotating shaft assembly of the foldable electronic device; the compliant beam is configured to deform under the drive of the driving force to drive the multi-stable mechanism to switch states.

3. The multi-stable support plate according to claim 2, characterized in that The bistable mechanism includes two compliant beams, namely a first compliant beam and a second compliant beam; the first compliant beam and the second compliant beam are spaced apart in the width direction of the support portion.

4. The multi-stable support plate according to claim 3, characterized in that, The bistable mechanism further includes a moving block; The moving block is located between the first compliant beam and the second compliant beam, one end of the first compliant beam and one end of the second compliant beam are respectively connected to the moving block, and the moving block is connected to the back side of the support portion; The first compliant beam and the second compliant beam are respectively configured to deform under the drive of the driving force to drive the moving block to move; wherein, when the moving block moves to the first stable position, the multi-stable mechanism is in the first stable state, and the moving block drives the support portion to move to the first position; when the moving block moves to the second stable position, the multi-stable mechanism is in the second stable state, and the moving block drives the support portion to move to the second position.

5. The multi-stable support plate according to claim 3 or 4, characterized in that, The bistable mechanism further includes a first fixing block and a second fixing block spaced apart in the width direction of the support portion; The first compliant beam and the second compliant beam are located between the first fixing block and the second fixing block, the other end of the first compliant beam is connected to the first fixing block, the other end of the second compliant beam is connected to the second fixing block, and the first fixing block and the second fixing block are configured to be fixed in the rotating shaft assembly.

6. The multi-stable support plate according to any one of claims 2 to 5, characterized in that, A rigid block is disposed on the compliant beam.

7. The multi-stable support plate according to any one of claims 1 to 6, characterized in that, The multi-stable support plate includes a plurality of the multi-stable mechanisms; The plurality of multi-stable mechanisms are spaced apart in the length direction of the support portion.

8. The multi-stable support plate according to any one of claims 1 to 7, characterized in that, The multi-stable support plate further includes a driving mechanism disposed on the back side of the support portion; The driving mechanism includes a first driving portion and a second driving portion; the first driving portion and the second driving portion are spaced apart in the width direction of the support portion; The first driving portion and the second driving portion are respectively configured to drive the multi-stable mechanism to switch states under the drive of the driving force.

9. The multi-stable support plate according to claim 8, characterized in that, The first driving portion includes a first driving sub-portion, a connecting portion, and a second driving sub-portion; The first driving sub - part and the second driving sub - part are spaced apart in the thickness direction of the support part, and the second driving sub - part is farther away from the support part; the connecting part is connected between the first driving sub - part and the second driving sub - part, and forms an opening with the first driving sub - part and the second driving sub - part; the opening of the first driving part is for the first swing arm of the rotating shaft assembly to extend into the first driving part, and the opening of the second driving part is for the second swing arm of the rotating shaft assembly to extend into the second driving part, so as to provide the driving force; Wherein, when the driving force acts on the first driving sub - part, the first driving part and the second driving part drive the multi - stable mechanism to switch from the second stable state to the first stable state, so as to drive the support part to move from the second position to the first position; when the driving force acts on the second driving sub - part, the first driving part and the second driving part drive the multi - stable mechanism to switch from the first stable state to the second stable state, so as to drive the support part to move from the first position to the second position.

10. The multi-stable support plate according to claim 9, characterized in that, The multi - stable support plate includes a support plate body and two driving members; The two driving members are arranged at intervals along the width direction of the support plate body, and are respectively connected to the back side of the support plate body to form the first driving part and the second driving part; The support part body is also used to form the support part.

11. The multi-stable support plate according to claim 10, wherein The driving member includes a first driving area, a connecting area and a second driving area; The support plate body includes a support area and two third driving areas, and the two third driving areas are respectively arranged on both sides of the width direction of the support area; the support area is used to form the support part; The connecting area is used to form the connecting part, and the second driving area is used to form the second driving sub - part; The first driving area of one driving member and the third driving area of one driving member are stacked and connected to form the first driving sub - part of the first driving part; the first driving area of the other driving member and the third driving area of the other driving member are stacked and connected to form the first driving sub - part of the second driving part.

12. The multi-stable support plate according to claim 11, wherein, The support plate body is a carbon fiber board or a stainless steel sheet; The two driving members and the multi - stable mechanism are all made of metal materials; The two driving members, the multi - stable mechanism are respectively connected to the support plate body by means of plastic adhesive.

13. The multi-stable support plate according to claim 12, characterized in that, The first driving sub - part includes a first plastic layer, the third driving area, the first driving area, and a second plastic layer stacked in sequence along the thickness direction of the support part; The plastic penetrates between the first driving area and the third driving area; the plastic penetrating the first driving area and the third driving area is respectively lapped with the first plastic layer and the second plastic layer.

14. The multi-stable support plate according to claim 12 or 13, characterized in that, The moving block of the multi - stable mechanism is stacked on the back side of the support area; the plastic penetrates between the support area and the moving block, and the plastic is distributed on the front side of the support area; the plastic penetrating the support area and the moving block is lapped with the plastic distributed on the front side of the support area.

15. The multi-stable support plate according to claim 14, characterized in that, When the support plate body is the carbon fiber board, the plastic distributed on the positive side of the support area is at least located in the area facing the moving block; When the support plate body is the stainless steel sheet, the plastic distributed on the positive side of the support area covers the upper surface of the support area.

16. The multi-stable support plate according to claim 10 or 11, characterized in that, The support plate body is a pure metal sheet; Both of the two driving members and the multi-stable mechanism are made of metal; The two driving members and the multi-stable mechanism are respectively connected to the support plate body by welding or sintering.

17. The multi-stable support plate according to any one of claims 8 to 16, characterized in that, The multi-stable mechanism includes a first side and a second side distributed in the length direction of the support portion; The driving mechanism includes two sets of driving part pairs, and one set of driving part pairs includes a first driving part and a second driving part; one set of driving part pairs is distributed on one side of the multi-stable mechanism; the other set of driving part pairs is arranged on the other side of the multi-stable mechanism.

18. The multi-stable support plate according to any one of claims 8 to 17, characterized in that, The multi-stable support plate includes multiple sets of the driving mechanisms; Multiple sets of the driving mechanisms are spaced apart in the length direction of the support portion.

19. The multi-stable support plate according to any one of claims 1 to 18, characterized in that, The multi-stable support plate is of an integrally formed structure.

20. A rotating shaft assembly, characterized in that, Applied to a foldable electronic device, the rotating shaft assembly includes: A shaft seat; A first swing arm and a second swing arm; the first swing arm and the second swing arm are rotatably connected to both sides of the shaft seat and can rotate around the shaft seat between a flattened position and a folded position; The multi-stable support plate according to any one of claims 1 to 19, arranged on the positive side of the shaft seat; the multi-stable mechanism of the multi-stable support plate is used to switch states under the driving force provided by the first swing arm and / or the second swing arm, so as to drive the support portion of the multi-stable support plate to move up and down relative to the shaft seat; Wherein, when the first swing arm and the second swing arm rotate to the flattened position, the multi-stable mechanism is in the first stable state, and the support portion moves to the first position; when the first swing arm and the second swing arm rotate to the folded position, the multi-stable mechanism is in the second stable state, and the support portion moves to the second position.

21. The rotating shaft assembly according to claim 20, wherein The first swing arm includes a first door panel swing arm, and the second swing arm includes a second door panel swing arm; the rotating shaft assembly further includes a first door panel and a second door panel; One end of the first door panel swing arm is rotatably connected to the shaft seat, and the other end of the first door panel swing arm is slidably connected to the first door panel; One end of the second door panel swing arm is rotatably connected to the shaft seat, and the other end of the second door panel swing arm is slidably connected to the second door panel.

22. The rotating shaft assembly according to claim 20, wherein The first swing arm includes a first main swing arm, and the second swing arm includes a second main swing arm; the rotating shaft assembly further includes a first connecting member and a second connecting member; One end of the first main swing arm is rotatably connected to the shaft seat, and the other end of the first main swing arm is rotatably connected to the first connecting member; One end of the second main swing arm is rotatably connected to the shaft seat, and the other end of the second main swing arm is rotatably connected to the second connecting member.

23. The shaft assembly according to claim 20, wherein, The first swing arm includes a first sub-swing arm, and the second swing arm includes a second sub-swing arm; the rotating shaft assembly further includes a first connecting member and a second connecting member; One end of the first auxiliary swing arm is rotatably connected to the shaft seat, and the other end of the first auxiliary swing arm is slidably connected to the first connecting member; One end of the second auxiliary swing arm is rotatably connected to the shaft seat, and the other end of the second auxiliary swing arm is slidably connected to the second connecting member.

24. The shaft assembly according to claim 20, wherein The first swing arm includes a first damping swing arm, and the second swing arm includes a second damping swing arm; the rotating shaft assembly further includes a damping assembly, a first connecting member, and a second connecting member; The first damping swing arm and the second damping swing arm are respectively connected to the damping assembly; One end of the first damping swing arm is rotatably connected to the shaft seat, and the other end of the first damping swing arm is in a higher pair connection with the first connecting member; One end of the second damping swing arm is rotatably connected to the shaft seat, and the other end of the second damping swing arm is in a higher pair connection with the second connecting member.

25. The shaft assembly according to claim 24, wherein The rotating shaft assembly further includes a synchronization assembly; The first damping swing arm and the second damping swing arm are connected by the synchronization assembly.

26. The rotating shaft assembly according to any one of claims 20 to 25, wherein When the first swing arm and the second swing arm rotate to the flattened position, the end of the first swing arm close to the shaft seat extends into the opening of the first driving portion of the multi-stable support plate and is located between the first driving sub-portion and the second driving sub-portion of the first driving portion, and the end of the second swing arm close to the shaft seat extends into the opening of the second driving portion of the multi-stable support plate and is located between the first driving sub-portion and the second driving sub-portion of the second driving portion; During the rotation of the first swing arm and the second swing arm from the folded position to the flattened position, the end of the first swing arm close to the shaft seat contacts the first driving sub-portion of the first driving portion, and the end of the second swing arm close to the shaft seat contacts the first driving sub-portion of the second driving portion to provide the driving force acting on the first driving sub-portion; During the rotation of the first swing arm and the second swing arm from the flattened position to the folded position, the end of the first swing arm close to the shaft seat contacts the second driving sub-portion of the first driving portion, and the end of the second swing arm close to the shaft seat contacts the second driving sub-portion of the second driving portion to provide the driving force acting on the second driving sub-portion.

27. The shaft assembly according to claim 26, wherein When the first swing arm and the second swing arm rotate along the first direction and reach the transition position between the flattened position and the folded position, the multi-stable mechanism is in an unstable equilibrium state, the support portion moves to the third position between the first position and the second position, and the gaps between the end of the first swing arm close to the shaft seat and the first driving sub-portion, and between the end of the second swing arm close to the shaft seat and the first driving sub-portion are both smaller than the first preset threshold; the first direction is the direction of rotation from the flattened position to the folded position.

28. The rotating shaft assembly according to claim 26 or 27, characterized in that, When the first swing arm and the second swing arm rotate along the second direction and rotate to a transition position between the flattened position and the folded position, the multistable mechanism is in an unstable equilibrium state, the support portion moves to a third position between the first position and the second position, and the gap between the end of the first swing arm close to the axle seat and the second driving sub-portion, as well as the gap between the end of the second swing arm close to the axle seat and the second driving sub-portion, are both smaller than a second preset threshold value; the second direction is the direction of rotation from the folded position to the flattened position.

29. The rotating shaft assembly according to any one of claims 20 to 28, characterized in that The rotating shaft assembly includes a plurality of swing arm pairs; wherein a group of the swing arm pairs includes one first swing arm and one second swing arm; and the plurality of swing arm pairs are spaced apart in the length direction of the shaft seat; A group of the swing arm pairs is used to drive a group of the driving mechanisms among the multiple groups of driving mechanisms of the multi-stable support plate.

30. The shaft assembly according to any one of claims 20 to 29, characterized in that, The shaft seat includes a first mounting platform and a second mounting platform; the first mounting platform and the second mounting platform are located on both sides of the second center line; The first fixing block of the multi-stable mechanism is matched with the mortise and tenon joints of the first mounting platform, and the second fixing block of the multi-stable mechanism is matched with the mortise and tenon joints of the second mounting platform.

31. The shaft assembly according to claim 30, characterized in that: A first protrusion extending along the thickness direction of the support portion is provided on one side of the first fixing block facing the second fixing block; a second protrusion extending along the thickness direction of the support portion is provided on one side of the second fixing block facing the first fixing block; The first mounting platform has a first notch; the platform forming the first notch includes a first platform facing the side where the second mounting platform is located; the first platform has a first groove extending along the thickness direction of the shaft seat; The second mounting platform has a second notch, and the platform surface forming the second notch includes a third platform surface facing the side where the first mounting platform is located and a fourth platform surface facing the side where the supporting portion is located, and the third platform surface has a second groove extending along the thickness direction of the shaft seat; The first fixing block is seated at the first notch, and the first protrusion is embedded in the first groove; The second fixing block is seated at the second notch, and the second protrusion is embedded in the second groove.

32. The shaft assembly according to claim 30 or 31, characterized in that: The table surface forming the first notch includes a second table surface facing the side where the support portion is located; the second table surface has a third groove extending along the length direction of the support portion; The table surface forming the second notch includes a fourth table surface facing the side where the support portion is located, and the fourth table surface has a fourth groove extending along the length direction of the support portion; The first fixing block is seated at the first notch, and one end of the first fixing block away from the supporting portion is embedded in the third groove; The second fixing block is seated at the second notch, and one end of the second fixing block away from the supporting portion is embedded in the fourth groove.

33. A foldable electronic device, characterized in that, include: Foldable display; The rotating shaft assembly according to any one of claims 20 to 32; the foldable display screen is disposed on one side of the rotating shaft assembly; the multi-stable support plate of the rotating shaft assembly is mounted on the shaft seat of the rotating shaft assembly and is located between the shaft seat and the foldable display screen; Wherein, when the first swing arm and the second swing arm of the rotating shaft assembly rotate, the multi-stable support plate is driven to move relative to the shaft seat, so as to support the foldable display screen or provide a screen accommodation space to avoid the foldable display screen.

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