Folding device and electronic device

Abstract

The present application provides a folding device and an electronic device. The folding device includes a first shell, a second shell and a stroke control assembly; the second shell includes a main shell and a sub-shell, the main shell includes a first side and a second side that are relatively arranged, the first shell and the first side are rotatably connected by a rotating shaft, and the sub-shell is located on one side of the second side; the stroke control assembly includes a first traction rope, the first end of the first traction rope is fixed to the rotating shaft or the first shell, and the second end of the first traction rope is fixed to the sub-shell, during the relative rotation of the first shell and the second shell, the first end is displaced relative to the main shell, and the second end drives the sub-shell to slide along the first direction, and the first direction is the direction extending vertically between the first side and the second side. The folding device of the present application is used to solve the problem that existing electronic devices are thick and the flexible display screen is uneven when unfolded.

Description

Technical Field

[0001] The present application relates to the technical field of electronic devices, and in particular to a folding device and an electronic device including the folding device. Background Art

[0002] Foldable electronic devices, such as foldable phones, foldable tablets, and foldable computers, must not only offer high performance but also possess a good appearance, appropriate weight, and a compact size. Existing foldable electronic devices fold using hinge assemblies. However, these hinge assemblies are complex and large, resulting in thicker electronic devices. Furthermore, when the flexible display screen is unfolded, it remains uneven in the folded position. Summary of the Invention

[0003] The present application provides a folding device and an electronic device including the folding device, which are used to solve the problem that existing electronic devices are thick and the flexible display screen is uneven when unfolded.

[0004] The folding device described in the present application includes a first shell, a second shell and a stroke control assembly;

[0005] The second housing includes a main housing and a secondary housing, the main housing includes a first side and a second side that are opposite to each other, the first housing and the first side are rotatably connected via a rotating shaft, and the secondary housing is located on one side of the second side;

[0006] The stroke control component includes a first traction rope, the first end of the first traction rope is fixed to the rotating shaft or the first shell, and the second end of the first traction rope is fixed to the auxiliary shell. During the relative rotation of the first shell and the second shell, the first end is displaced relative to the main shell, and the second end drives the auxiliary shell to slide along the first direction, and the first direction is the direction extending vertically between the first side and the second side.

[0007] The folding device described in the present application includes a travel control assembly, which includes a first traction rope, a first end of which is fixed to the rotating shaft or the first housing, and a second end of which is fixed to the secondary housing. During the relative rotation of the first housing and the second housing, the first end is displaced relative to the main housing, and the second end drives the secondary housing to slide in a first direction. In other words, during the relative rotation of the first housing and the second housing, the secondary housing not only rotates relative to the first housing but also slides in the first direction. Therefore, when the folding device is applied to an electronic device, the secondary housing of the folding device can adjust the sliding distance of the flexible display of the electronic device in the first direction according to the different states of the flexible display of the electronic device in the folded and flattened states. It is understood that during the rotation of the secondary housing relative to the first housing, the flexible display extends in the sliding direction of the secondary housing, so that the flexible display remains flat when the first and second housings are in the flattened state, preventing the flexible display of the electronic device from arching when flattened, and ensuring that the flexible display always fits the folding device, thereby increasing the service life of the flexible display, achieving an aesthetically pleasing appearance of the electronic device, and improving the user experience. At the same time, the first shell and the second shell of the folding device are rotatably connected by a rotating shaft, that is, the first shell and the second shell are rotatably connected by a single-axis connection structure, which has a simple structure and small size, and can realize the lightweight and thinness of the folding device. When the folding device is applied to electronic equipment, it is conducive to the lightweight and thinness of the electronic equipment.

[0008] In one embodiment, the first end is fixed to the outer circumference of the rotating shaft. When the first housing and the second housing are relatively flattened, the first end rotates about the rotating shaft, so that the second end drives the auxiliary housing to slide in the first direction away from the rotating shaft. In other words, the first traction rope rotates about the rotating shaft to provide a pulling force to the auxiliary housing away from the rotating shaft, so that the auxiliary housing slides in the first direction away from the rotating shaft.

[0009] In one embodiment, the stroke control assembly further includes a stroke amplifier connected between the secondary housing and the second end, and the stroke amplifier is configured to cause the distance that the secondary housing slides along the first direction away from the rotation axis to be greater than the distance that the first end rotates around the rotation axis. It is understood that when the folding device is applied to an electronic device, during the process of switching the first and second housings from a folded state to a flattened state, the distance that the flexible display screen extends in the sliding direction of the secondary housing (the first direction) is the distance that the secondary housing should slide along the first direction away from the rotation axis. The distance that the flexible display screen extends in the sliding direction of the auxiliary shell is specifically the distance that the flexible display screen rotates around the rotating shaft, and the distance that the first end rotates around the rotating shaft is less than the distance that the flexible display screen rotates around the rotating shaft. Therefore, a stroke amplifier is provided between the first traction rope and the auxiliary shell to amplify the distance that the first end rotates around the rotating shaft, so that the distance that the auxiliary shell slides along the first direction back to the rotating shaft is equal to the distance that the flexible display screen rotates around the rotating shaft, thereby enabling the flexible display screen and the auxiliary shell to move synchronously to ensure that when the electronic device switches between a folded state and a flattened state, the flexible display screen is always in contact with the folding device, thereby improving the service life of the flexible display screen, achieving a beautiful appearance of the electronic device, and improving user experience.

[0010] In one embodiment, the distance that the auxiliary housing slides along the first direction away from the rotating shaft is N times the distance that the first end rotates around the rotating shaft, that is, the magnification factor of the stroke amplifier is N times, where N = R1 / R2, R1 = R 11 +T,R 11is the distance from the surface of the main shell facing away from the shaft to the axis of the shaft, T is the distance from the neutral layer of the flexible display screen to the surface of the main shell facing away from the shaft when the main shell carries the flexible display screen, and R2 is the distance from the first end located at the periphery of the shaft to the axis of the shaft. It can be understood that when the folding device is applied to an electronic device, the main shell sequentially carries a support member and a flexible display screen for supporting the flexible display screen, and the neutral layer of the flexible display screen is generally a layer between the surface of the flexible display screen facing the main shell and the surface of the flexible display screen facing away from the main shell. For example, if the sum of the thicknesses of the support member and the flexible display screen is 1 mm, the distance from the neutral layer of the flexible display screen to the surface of the main shell facing away from the shaft is between 0 mm and 1 mm. By limiting the distance that the secondary shell slides along the first direction back toward the rotating shaft to N times the distance that the first end rotates around the rotating shaft, the distance that the secondary shell slides along the first direction back toward the rotating shaft is equal to the distance that the flexible display screen rotates around the rotating shaft, thereby enabling the flexible display screen and the secondary shell to move synchronously, thereby ensuring that when the electronic device switches between a folded state and an unfolded state, the flexible display screen is always in contact with the folding device, thereby improving the service life of the flexible display screen, achieving a beautiful appearance of the electronic device, and improving the user experience.

[0011] In one embodiment, the stroke amplifier is a lever, which includes a middle portion and a first end and a second end connected to both sides of the middle portion. The middle portion is rotatably mounted on the main housing, the second end is connected to the first end, and the second end is connected to the auxiliary housing. When the first end rotates around the rotating shaft, the second end pulls the first end toward the rotating shaft, so that the second end pushes the auxiliary housing to slide away from the rotating shaft. The main housing not only drives the auxiliary housing to rotate relative to the first housing, but also fixes the lever so that the first end and the second end of the lever can move in opposite directions to push the auxiliary housing to slide along the first direction away from the rotating shaft. At the same time, the setting of the lever's magnification is achieved by setting the position where the lever is fixed to the main housing. Of course, in other embodiments, the stroke amplifier is not limited to the structure described above, as long as it can amplify the distance that the first end rotates around the rotating shaft.

[0012] In one embodiment, the stroke amplifier includes a gear, the gear including a third end and a fourth end disposed opposite each other, the third end being connected to the main housing, the fourth end being connected to the auxiliary housing, and the second end being connected between the third and fourth ends and close to the fourth end. When the first end rotates around the rotating shaft, the second end pulls the gear away from the rotating shaft, so that the fourth end drives the auxiliary housing to slide along the first direction away from the rotating shaft. Of course, in other embodiments, the stroke amplifier is not limited to the structure described above, as long as it can amplify the distance that the first end rotates around the rotating shaft.

[0013] In one embodiment, the stroke amplifier further includes a connecting block connected between the gear and the second end, and the gear is capable of rotating relative to the connecting block. When the first end rotates about the rotating shaft, the second end pulls the gear away from the rotating shaft via the connecting block. In other words, the second end is connected to the gear via the connecting block, and the gear is capable of rotating relative to the connecting block. Therefore, when the second end pulls the connecting block, the gear is forced to move and rotates appropriately, thereby more smoothly driving the auxiliary housing to slide along the first direction away from the rotating shaft.

[0014] In one embodiment, the stroke amplifier is a slider, which includes a connected fixed part and a limiting part. A slide groove is provided on the main shell, and the slider is located in the slide groove. The fixed part is connected to the second end. The auxiliary shell includes a through groove. The auxiliary shell partially covers the main shell, and the limiting part is limited in the through groove. When the first end rotates around the rotating shaft, the second end pulls the slider to slide, and the slider drives the auxiliary shell to slide along the first direction back to the rotating shaft through the limiting part.

[0015] In one embodiment, the stroke control assembly further includes a second traction rope, the third end of the second traction rope is connected to the outer periphery of the rotating shaft, the fourth end of the second traction rope is connected to the stroke amplifier, and is located on opposite sides of the stroke amplifier as the second end. During the folding process of the first shell and the second shell, the third end rotates around the rotating shaft to cause the secondary shell to slide along the first direction toward the rotating shaft. That is, the present application forms a closed-loop pulling structure by respectively arranging the first traction rope and the second traction rope on opposite sides of the stroke amplifier. When the folding device is applied to an electronic device, when the first shell and the second shell are flattened or folded, the first traction rope and the second traction rope respectively pull the secondary shell to slide along the first direction away from or toward the rotating shaft, so that the secondary shell adapts to the state change of the flexible display screen, ensures that the flexible display screen is always in contact with the folding device, improves the service life of the flexible display screen, realizes the beautiful appearance of the electronic device, and improves the user experience.

[0016] In one embodiment, the stroke control assembly further includes a pulley, which is provided on the main housing. The first traction rope and / or the second traction rope change the direction of the force through the pulley, so that the first traction rope and the second traction rope drive the sub-housing to slide along the first direction. The first traction rope and / or the second traction rope of the stroke control assembly in this embodiment adjust the direction of the force applied to the stroke amplifier by rotating around the pulley, thereby pulling the sub-housing to slide along the first direction away from or toward the rotating shaft, respectively, so that the sub-housing adapts to the state change of the flexible display screen, ensures that the flexible display screen is always in contact with the folding device, increases the service life of the flexible display screen, realizes the beautiful appearance of the electronic device, and improves the user experience.

[0017] In one embodiment, the rotation direction of the rotating shaft includes a second direction and a third direction, and the first end and the third end are fixed around the rotating shaft along the second direction and the third direction, respectively. It is understandable that when the first end and the third end are fixed around the rotating shaft from the second direction and the third direction, respectively, when the first shell and the second shell are unfolded, the first end rotates around the rotating shaft to provide a force that pulls the secondary shell to slide along the first direction away from the rotating shaft. When the first shell and the second shell are folded, the third end rotates around the rotating shaft to provide a force that pulls the secondary shell to slide along the first direction toward the rotating shaft. The present application arranges the first traction rope and the second traction rope to be fixed to the rotating shaft in different directions, thereby achieving the goal of pulling the secondary shell to slide along the first direction away from or toward the rotating shaft by winding different traction ropes during the folding or flattening process of the first shell and the second shell due to the different rotation directions of the rotating shaft.

[0018] In one embodiment, the rotation direction of the rotating shaft includes a second direction and a third direction, and the first traction rope and the second traction rope are both fixed around the rotating shaft in the second direction, or the first traction rope and the second traction rope are both fixed around the rotating shaft in the third direction; the rotating shaft includes a first portion, a second portion, and a reversing assembly connected between the first portion and the second portion, the first end being fixed around the first portion, and the third end being fixed around the second portion, and the reversing assembly is used to make the first portion and the second portion rotate in opposite directions. In other words, when the first traction rope and the second traction rope are both fixed around the rotating shaft in the second direction or the third direction, by dividing the rotating shaft into two portions and providing a reversing assembly between the two portions of the rotating shaft, the two portions of the rotating shaft rotate in opposite directions, so that when the first housing and the second housing are flattened or folded, the first traction rope and the second traction rope can respectively pull the secondary housing to slide along the first direction away from or toward the rotating shaft.

[0019] In one embodiment, the rotating shaft includes a fixing portion, the outer circumference of which includes a groove, and the first end is fixed to the fixing portion. When the first end rope rotates around the rotating shaft, the first end is received in the groove. The fixing portion can more firmly fix the first traction rope to the rotating shaft. At the same time, the groove is provided on the outer circumference of the fixing portion. Therefore, when the first end rotates around the rotating shaft, no additional space is required to reserve the first end. This is conducive to the miniaturization of the rotating shaft assembly, and further facilitates the miniaturization of the folding device. When the folding device is applied to an electronic device, it increases the lightness and thinness of the electronic device and improves the user experience.

[0020] The electronic device described in this application includes a flexible display and a folding device described in any of the above embodiments, wherein the flexible display is mounted on the folding device. The electronic device with the folding device has an attractive appearance, is light and thin, and greatly improves the user experience.

[0021] In one embodiment, the electronic device includes a support member, which is provided between the flexible display screen and the folding device, with opposite sides of the support member being connected to the first shell and the secondary shell, respectively. During the folding process of the first and second shells, the support member pulls the secondary shell to slide along the first direction toward the direction close to the rotating shaft. It is understandable that the opposite sides of the support member are connected to the first shell and the secondary shell, respectively. During the folding process of the first and second shells, when the first and second shells are flattened, the portion of the support member located in the second shell will wrap around the outside of the rotating shaft to pull the secondary shell to slide along the first direction toward the direction close to the rotating shaft, thereby driving the flexible display screen and the secondary shell to move synchronously.

[0022] In one embodiment, the support member includes a first support portion, a second support portion, and a third support portion connected in sequence. The first support portion is located in the first shell, the third support portion is located in the second shell, the second support portion corresponds to the rotation axis, and the second support portion is provided with a plurality of through holes. The provision of the plurality of through holes in the second support portion facilitates the folding of the second support portion when the first shell and the second shell are folded.

[0023] In one embodiment, the first shell includes a receiving space, the receiving space faces away from the flexible display screen, and the electronic components of the electronic device are all located in the receiving space. That is, the second shell does not accommodate any electronic components other than the flexible display screen, and all electronic components other than the flexible display screen are contained in the receiving space. This layout is simple and has high space utilization. Compared with arranging the electronic components of the electronic device in the first shell and the second shell respectively, there is no need to set a through-axis cable in the hinge assembly to connect the electronic components located in the first shell and the second shell respectively, so that the hinge assembly does not need to provide additional space for the through-axis cable, nor does it need to set a through-axis heat dissipation structure or through-axis protection, which greatly reduces the size and weight of the hinge assembly and improves the lightness and thinness of the electronic device. At the same time, if a through-axis cable is not set in the hinge assembly, the through-axis cable will not be damaged due to bending during the folding or flattening process of the electronic device, which is also beneficial to the sealing of the electronic device and improves the reliability of the electronic device.

[0024] The folding device described in the present application includes a travel control assembly, which includes a first traction rope, a first end of which is fixed to the rotating shaft or the first housing, and a second end of which is fixed to the secondary housing. During the relative rotation of the first housing and the second housing, the first end is displaced relative to the main housing, and the second end drives the secondary housing to slide in a first direction. In other words, during the relative rotation of the first housing and the second housing, the secondary housing not only rotates relative to the first housing but also slides in the first direction. Therefore, when the folding device is applied to an electronic device, the secondary housing of the folding device can adjust the sliding distance of the flexible display of the electronic device in the first direction according to the different states of the flexible display of the electronic device in the folded and flattened states. It is understood that during the rotation of the secondary housing relative to the first housing, the flexible display extends in the sliding direction of the secondary housing, so that the flexible display remains flat when the first and second housings are in the flattened state, preventing the flexible display of the electronic device from arching when flattened, and ensuring that the flexible display always fits the folding device, thereby increasing the service life of the flexible display, achieving an aesthetically pleasing appearance of the electronic device, and improving the user experience. At the same time, the first shell and the second shell of the folding device are rotatably connected by a rotating shaft, that is, the first shell and the second shell are rotatably connected by a single-axis connection structure, which has a simple structure and small size, and can realize the lightweight and thinness of the folding device. When the folding device is applied to electronic equipment, it is conducive to the lightweight and thinness of the electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0026] Figure 1 This is a schematic structural diagram of an electronic device in an unfolded state provided by an embodiment of the present application;

[0027] Figure 2 yes Figure 1 A schematic structural diagram of the electronic device shown is in a folded state;

[0028] Figure 3 This is a schematic diagram of the exploded structure of an electronic device provided in one embodiment of the present application;

[0029] Figure 4 yes Figure 3 A schematic diagram of the exploded structure of the folding device shown;

[0030] Figure 5 yes Figure 3 A schematic diagram of the exploded structure of another embodiment of the electronic device shown;

[0031] Figure 6 yes Figure 3 A schematic cross-sectional view of the folding device in the AA direction is shown;

[0032] Figure 7 yes Figure 3 A schematic cross-sectional structure diagram of the folding device in the BB direction is shown;

[0033] Figure 8 yes Figure 3 A partial enlarged schematic diagram of a first region of the electronic device shown;

[0034] Figure 9 yes Figure 3 A schematic structural diagram of another embodiment of the folding device shown;

[0035] Figure 10 yes Figure 9 A partial structural schematic diagram of the folding device shown;

[0036] Figure 11 yes Figure 10 The cross-sectional structural diagram of the folding device in the CC direction is shown;

[0037] Figure 12 yes Figure 10 The cross-sectional structural diagram of the folding device in the DD direction is shown;

[0038] Figure 13 yes Figure 9 A schematic structural diagram of another embodiment of the folding device shown;

[0039] Figure 14 yes Figure 13 A partial structural schematic diagram of the folding device shown;

[0040] Figure 15 yes Figure 3 A schematic structural diagram of another embodiment of the folding device shown;

[0041] Figure 16 yes Figure 15 A schematic diagram of the partial structure of the folding device shown.

[0042] Figure 17 yes Figure 3 A schematic structural diagram of another embodiment of a folding device is shown. DETAILED DESCRIPTION

[0043] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0044] An embodiment of the present application provides an electronic device, including but not limited to a mobile phone, a tablet computer, a laptop computer, an e-reader, a wearable device, an in-vehicle device, etc. The electronic device can be folded and flattened.

[0045] Please also refer to Figure 1 and Figure 2 , Figure 1 1 is a structural diagram of an electronic device 100 provided in an embodiment of the present application in an unfolded state; Figure 2 yes Figure 1 The electronic device 100 is a schematic structural diagram in a folded state. Figure 1 The electronic device 100 is described by taking a mobile phone as an example.

[0046] The electronic device 100 includes a first straight area a1, a bent area a2, and a second straight area a3 connected in sequence. The bent area a2 can be deformed so that the first straight area a1 is unfolded or folded relative to the second straight area a3. Figure 1 As shown, the first flat area a1 is unfolded relative to the second flat area a3, and the electronic device 100 is in an unfolded state. Figure 2 As shown, the second straight area a3 is folded relative to the second straight area a3, and the electronic device 100 is in a folded state. When the bending area a2 is deformed, the first straight area a1 and the second straight area a3 can rotate about the rotation axis a21 of the bending area a2. It is defined that the width direction X of the electronic device 100 is perpendicular to the rotation axis a21 of the bending area a2, the length direction Y of the electronic device 100 is parallel to the rotation axis a21 of the bending area a2, and the thickness direction Z of the electronic device 100 is perpendicular to the width direction X and the length direction Y of the electronic device 100.

[0047] The electronic device 100 includes a folding device 10 and a flexible display screen 20. The flexible display screen 20 is mounted on the folding device 10. The flexible display screen 20 is used to display images, videos, etc. The flexible display screen 20 can be bent. The two parts of the folding device 10 can rotate relative to each other to drive the flexible display screen 20 to fold or unfold. The electronic device 100 has an outward folding screen structure. Figure 2 As shown, when the electronic device 100 is in the folded state, the flexible display screen 20 is located outside the folding device 10 and exposed outside the electronic device 100. The user can touch the flexible display screen 20 when the electronic device 100 is in the folded state.

[0048] The flexible display screen 20 includes a first straight portion 21, a curved portion 22, and a second straight portion 23. The curved portion 22 of the flexible display screen 20 is connected between the first straight portion 21 of the flexible display screen 20 and the second straight portion 23 of the flexible display screen 20. Figure 2As shown, when the electronic device 100 is in the folded state, the first straight portion 21 of the flexible display screen 20 is located in the first straight area a1. The curved portion 22 of the flexible display screen 20 is located in the bent area a2. The second straight portion 23 of the flexible display screen 20 is located in the second straight area a3. The size of the electronic device 100 in its width direction X is reduced, making the electronic device 100 easier to store and carry. At this time, the first straight portion 21 of the flexible display screen 20, the curved portion 22 of the flexible display screen 20, and the second straight portion 23 of the flexible display screen 20 ( Figure 2 For example, the curved portion 22 of the flexible display screen 20 performs display, thereby realizing the side display of the electronic device 100. The first flat portion 21 of the flexible display screen 20 or the second flat portion 23 of the flexible display screen 20 performs display, thereby realizing the single-sided display of the electronic device 100. Figure 1 As shown, when the electronic device 100 is in the unfolded state, the first flat portion 21, the curved portion 22, and the second flat portion 23 of the flexible display 20 can be displayed simultaneously, achieving a large-screen display and improving the user's viewing experience. The flexible display 20 can also be integrated with touch functionality. The electronic device 100 can respond to a user's touch gesture on the flexible display 20 by waking up the corresponding portion of the flexible display 20.

[0049] For example, the flexible display screen 20 can be an organic light-emitting diode (OLED) display screen, an active-matrix organic light-emitting diode or an active-matrix organic light-emitting diode (AMOLED) display screen, a mini organic light-emitting diode (MID) display screen, a micro organic light-emitting diode (MID) display screen, a micro organic light-emitting diode (MID) display screen, a quantum dot light-emitting diode (QLED) display screen, etc.

[0050] Please also refer to Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the exploded structure of an electronic device provided in one embodiment of the present application; Figure 4 yes Figure 3 Schematic diagram of the exploded structure of the folding device shown.

[0051] The folding device 10 includes a first housing 11, a second housing 12, and a hinge assembly 13. The hinge assembly 13 connects the first housing 11 and the second housing 12 on opposite sides thereof, so that the first housing 11 and the second housing 12 rotate relative to each other or rotate in opposite directions via the hinge assembly 13, thereby realizing the folding or unfolding of the first housing 11 relative to the second housing 12. The first housing 11 and the second housing 12 can rotate about a rotation axis 130 of the hinge assembly 13. The rotation axis 130 of the hinge assembly 13 can be aligned with the rotation axis a21 of the bending region a2 of the electronic device 100 (see FIG. 1 ). Figure 1 )coincide.

[0052] The first housing 11 includes a main body 111 and a connecting portion 112. The connecting portion 112 is connected to the side of the main body 111 near the hinge assembly 13 and is used to connect to the hinge assembly 13. The main body 111 is located in the first flat area a1 of the electronic device 100, and the connecting portion 112 extends to the curved area a2 of the electronic device 100. The second housing 12 includes a main housing 121 and a secondary housing 122. The main housing 121 includes a first side v1 and a second side v2 that are oppositely disposed. The secondary housing 122 is located on either side of the second side v2 and engages with and slides relative to the main housing 121. The first side v1 of the main housing 121 is connected to the hinge assembly 13, allowing the main housing 121 to rotate the secondary housing 122 relative to or away from the first housing 11 via the hinge assembly 13, thereby placing the first and second housings 11, 12, in either a flat or folded state. The main housing 121 and secondary housing 122 of the second housing 12 are both located in the second flat area a3 of the electronic device 100. The rotating assembly is located in the bending area a2 of the electronic device 100 .

[0053] In some embodiments, the number of connecting portions 112 can be one or more. The connecting portions 112 can be located at both ends of the main body 111 on the side close to the rotation axis, or between the two ends of the main body 111 on the side close to the rotation axis, or both. For example, there are two connecting portions 112, one at each end of the main body 111 on the side close to the rotation axis.

[0054] In some embodiments, the connecting portion 112 and the main body 111 may be an integral structure to ensure the connection strength of the first housing 11. The connecting portion 112 may also be connected and fixed to the main body 111 by bonding, snapping, or other connection methods.

[0055] The first housing 11 also includes a first receiving portion 113, which is provided on the main body 111. The second housing 12 also includes a second receiving portion 123, which is provided on the main housing 121 and the auxiliary housing 122. The first receiving portion 113 and the second receiving portion 123 are connected. The first straight portion 21 of the flexible display 20 is received in the first receiving portion 113, the second straight portion 23 is received in the second receiving portion 123, and the curved portion 22 is partially received in the first receiving portion 113 and partially received in the second receiving portion 123. The flexible display 20 can be fixedly connected to the first receiving portion 113 and the second receiving portion 123 by methods such as dispensing glue.

[0056] At this time, the first shell 11 provides support for the first straight portion 21 of the flexible display 20, and the second shell 12 provides support for the partially curved portion and the second straight portion 23 of the flexible display 20. This reduces the risk of collapse or concavity of the first straight portion 21 and the second straight portion 23 of the flexible display 20 when subjected to external forces (such as user touch, accidental collision, etc.), and the flexible display 20 has higher reliability and a longer service life. It is understandable that the support provided by the first shell 11 to the first straight portion 21 of the flexible display 20 can be direct support (such as contact and support) or indirect support (such as support through an intermediate structural member). Similarly, the support provided by the second shell 12 to the second straight portion 23 of the flexible display 20 can be direct support or indirect support.

[0057] In the embodiment of this application, Figure 3 The electronic device 100 may further include a support member 30, which is disposed between the flexible display 20 and the folding device 10. Opposite sides of the support member 30 are connected to the first housing 11 and the secondary housing 122, respectively. Specifically, the opposite sides of the support member 30 are connected to the first receiving portion 113 and the bottom wall of the second receiving portion 123 located in the secondary housing 122, respectively. The support member 30 in the embodiment of the present application can provide continuous rigid support for the flexible display 20, allowing the flexible display 20 to maintain a relatively stable shape, thereby reducing the risk of collapse or concavity of the flexible display 20 when subjected to external forces.

[0058] Specifically, the support member 30 may include a first support portion 31, a second support portion 32, and a third support portion 33 connected in sequence. The first support portion 31 is located within the first receiving portion 113 of the first housing 11, the third support portion 33 is located within the second receiving portion 123 of the second housing 12, and the second support portion 32 is located between the first receiving portion 113 and the second receiving portion 123 and corresponds to the shaft assembly 13. The second support portion 32 is provided with a plurality of through holes 321. The provision of the plurality of through holes 321 on the second support portion 32 facilitates the folding of the second support portion 32 when the first housing 11 and the second housing 12 are folded.

[0059] For example, the support member 30 can be a metal sheet such as iron, copper, or steel to provide sufficient support strength for the flexible display 20. Of course, the support member 30 can also be a plastic sheet with a certain degree of hardness and elasticity. The support member 30 can be bonded to the flexible display 20 using adhesive, can be clamped to the flexible display 20 using a clamp, or can be fixed to the flexible display 20 using other connection methods.

[0060] In some embodiments, the first support portion 31 of the support member 30 may cover the entire bottom wall of the first receiving portion 113, or may cover only the bottom wall of the first receiving portion 113 near the rotating shaft assembly 13, i.e., the first support portion 31 of the support member 30 only covers a portion of the first receiving portion 113. Similarly, the second support portion 32 of the support member 30 may cover the entire bottom wall of the second receiving portion 123, or may cover the bottom wall of the second receiving portion 123 near the rotating shaft assembly 13, i.e., cover a portion of the second receiving portion 123. Figure 3 In the illustrated embodiment, the first supporting portion 31 of the supporting member 30 covers the entire bottom wall of the first receiving portion 113 , and the second supporting portion 32 of the supporting member 30 covers the entire bottom wall of the second receiving portion 123 . Figure 5 In the illustrated embodiment, the first supporting portion 31 of the supporting member 30 covers the bottom wall of the first receiving portion 113 close to the rotating shaft assembly 13 , and the second supporting portion 32 of the supporting member 30 covers the entire bottom wall of the second receiving portion 123 .

[0061] Of course, in other embodiments, no support member may be provided between the folding device 10 and the flexible display screen 20 , or a support member may be provided between one or both of the first shell 11 , the hinge assembly 13 , and the second shell 12 and the flexible display screen 20 .

[0062] In the embodiments of this application, please refer to Figure 6 , Figure 6 yes Figure 3 The cross-sectional structural diagram of the folding device shown in the AA direction.

[0063] The first housing 11 also includes a receiving space 114 opposite to the first receiving portion 113. The receiving space 114 faces away from the flexible display screen 20. The electronic components of the electronic device 100 (not shown) are all arranged in the receiving space 114. In other words, the second housing 12 does not accommodate any electronic components other than the flexible display screen 20. Except for the flexible display screen 20, all electronic components are accommodated in the receiving space 114. This layout is simple and has high space utilization. Compared with arranging the electronic components of the electronic device 100 in the first housing 11 and the second housing 12 respectively, there is no need to set a through-axis cable in the hinge assembly 13 to connect the electronic components respectively located in the first housing 11 and the second housing 12. Therefore, the hinge assembly 13 does not need to provide additional space for the through-axis cable, nor does it need to set a through-axis heat dissipation structure or through-axis protection. This greatly reduces the size and weight of the hinge assembly 13, while improving the lightness and thinness of the electronic device 100. At the same time, the shaft assembly 13 is not provided with a through-axis cable, so the through-axis cable will not be damaged due to bending when the electronic device 100 is folded or flattened, which is also beneficial to the sealing of the electronic device 100 and improves the reliability of the electronic device 100.

[0064] For example, the electronic components may include a circuit board, a battery, a receiver, a speaker, a camera module, a sensor module, an audio module, a fingerprint module, a wireless communication module, a mobile communication module, a motor module, and other electronic components. The circuit board may integrate electronic components such as the main controller, storage unit, antenna module, and power management module of the electronic device 100, while the battery may power the flexible display 20, the circuit board, the receiver, the speaker, the camera, and other electronic components.

[0065] The first housing 11 includes a wire hole 115 connecting the first receiving portion 113 and the receiving space 114 , so that the flexible display screen 20 located in the first receiving portion 113 is electrically connected to the electronic device controlling the display of the flexible display screen 20 located in the receiving space 114 through wires.

[0066] like Figure 2 and Figure 6 As shown, the outer surface of the first housing 11 facing away from the flexible display 20 is provided with a receiving groove 116. When the second housing 12 is folded relative to the first housing 11, the second housing 12 is received in the receiving groove 116, making the folded electronic device neater. Furthermore, since the second housing 12 is thinner than the first housing 11, it is better protected when received in the receiving groove 116. Of course, in other embodiments, the first housing 12 may not have a receiving groove.

[0067] like Figure 3 and Figure 4As shown, the main housing 121 may include a first groove 1211, which is recessed on the surface of the main housing 121 facing the flexible display 20. The auxiliary housing 122 includes a connecting tooth 1221, which is constrained within the first groove 1211 and can slide relative to the first groove 1211 toward or away from the rotating shaft assembly 13. In this embodiment, the main housing 121 and the auxiliary housing 122 are directly slidably connected. Of course, the main housing 121 and the auxiliary housing 122 can also be indirectly slidably connected, that is, the main housing 121 and the auxiliary housing 122 are slidably connected through a third party.

[0068] For example, the connecting teeth 1221 can be retained in the first groove 1211 by being engaged. Specifically, the connecting teeth 1221 are partially retained within the groove wall of the first groove 1211. When the connecting teeth 1221 are retained within the first groove 1211, the surface of the main housing 121 facing the flexible display 20 and the surface of the auxiliary housing 122 facing the flexible display 20 are coplanar, so that the main housing 121 and the auxiliary housing 122 together form the second receiving portion 123 for receiving the flexible display 20.

[0069] In some embodiments, the number of first grooves 1211 and connecting teeth 1221 can be one or more. In this embodiment, there are multiple connecting teeth 1221 and first grooves 1211, multiple first grooves 1211 are arranged at intervals, and multiple connecting teeth 1221 are arranged at intervals. Each first groove 1211 corresponds to a connecting tooth 1221. By providing multiple connecting teeth 1221 and multiple first grooves 1211, the direct connection between the main housing 121 and the auxiliary housing 122 is more stable.

[0070] like Figure 4 and Figure 6 In this embodiment of the present application, the hinge assembly 13 includes a hinge 131 and a rotating portion 132. The first housing 11 and the first side v1 are rotatably connected via the hinge 131. Specifically, the rotating portion 132 is sleeved around the outer periphery of the hinge 131 and is rotatable relative to the hinge 131. The first housing 11 is connected to the hinge 131, and the first side v1 of the main housing 121 is connected to the rotating portion 132. The hinge assembly 13 in this embodiment is a single-axis hinge structure with a simple structure and a small size, which enables a thinner and lighter foldable device 10, thereby facilitating a thinner and lighter electronic device 100.

[0071] The rotating portion 132 of the hinge assembly 13 supports a portion of the curved portion 22 of the flexible display 20. This reduces the risk of the curved portion 22 of the flexible display 20 collapsing or denting when subjected to external forces (e.g., user touch, accidental collision, etc.), thereby increasing the reliability and service life of the flexible display 20 while also improving the appearance and feel of the flexible display 20. It will be appreciated that the support provided by the rotating portion 132 of the hinge assembly 13 to the curved portion 22 of the flexible display 20 can be direct (e.g., contact and support) or indirect (e.g., support via an intermediate structural member).

[0072] The rotating shaft 131 may be formed of one column or a plurality of columns. Figure 4 In the illustrated embodiment, the rotating shaft is formed by two columns, both of which are fixed to the first housing 11. Specifically, one end of each column is connected to the connecting portion 112 adjacent thereto, and the other end is rotatably connected to the rotating portion 132. It will be understood that the rotating portion 132 includes an inner cavity, and the rotating shaft 131 is located within the inner cavity. The side of the rotating shaft 131 away from the connecting portion 112 is rotatably connected to the inner cavity wall.

[0073] In other embodiments, when the rotating shaft 131 is formed by two cylinders, there may be three corresponding connecting parts, and two cylinders are respectively fixed between adjacent connecting parts.

[0074] In other embodiments, the rotating shaft 131 is formed by a column, and both ends of the rotating shaft 131 are respectively fixed on corresponding connecting parts, and the rotating part is sleeved on the outer periphery of the rotating shaft located between the two connecting parts.

[0075] In the embodiment of the present application, the rotating portion 132 and the main housing 121 can be an integrally formed structure to increase the connection strength between the rotating portion 132 and the main housing 121, simplify the structure, and improve production efficiency. Of course, in other embodiments, the rotating portion 132 and the main housing 121 can also be connected by bonding, clamping, or welding.

[0076] In the embodiment of the present application, the rotating shaft assembly 13 also includes a damping component 133. The damping component 133 can be housed within the rotating shaft assembly 13. The damping component 133 is used to limit the first shell 11 and the second shell 12 when the first shell 11 and the second shell 12 are flattened, so as to keep the first shell 11 and the second shell 12 flat, thereby improving the user experience. Of course, the damping component 133 can also be used to limit the first shell 11 and the second shell 12 when the angle between the first shell 11 and the second shell 12 is 45 degrees, 135 degrees, etc. In other embodiments of the present application, the rotating shaft assembly 13 can also be provided without a damping component, and the first shell and the second shell can be kept flat by providing a structure such as a stop member.

[0077] In the embodiments of the present application, since the flexible display 20 is located outside the folding device 10 when the electronic device 100 is in the folded state, the portion of the flexible display 20 located on the rotating portion 132 of the hinge assembly 13 (the curved portion 22) is larger than the portion of the flexible display 20 located on the rotating portion 132 of the hinge assembly 13 when folded than when flattened. In other words, the contact area between the rotating portion 132 and the flexible display 20 is larger when the electronic device 100 is folded than when flattened. To prevent the excess portion of the flexible display 20 located on the rotating portion 132 (the partial curved portion 22) from bulging when the electronic device 100 switches from the folded state to the flattened state, the present application utilizes a main housing 121 and a secondary housing 122 to form a second housing 12. The secondary housing 122 can slide relative to the main housing 121, away from the hinge 131, so that the excess portion of the flexible display 20 (the partial curved portion 22) extends into the second housing 12, thereby ensuring that the flexible display 20 remains flat when unfolded. The electronic device 100 equipped with this folding device 10 has an aesthetically pleasing appearance and is lightweight and thin, significantly improving the user experience.

[0078] like Figure 3 and Figure 6 The folding device 10 also includes a travel control assembly 14, which includes a first traction rope 141 and a second traction rope 142. The first end of the first traction rope 141 is fixed to the outer periphery of the rotating shaft 131, the second end of the first traction rope 141 is fixed to the auxiliary housing 122, the third end of the second traction rope 142 is fixed to the outer periphery of the rotating shaft 131 and spaced apart from the first end, and the fourth end of the second traction rope 142 is fixed to the auxiliary housing 122. It should be understood that when the first and third ends of the first and second traction ropes 141, 142 are wrapped around the outer periphery of the rotating shaft 131, they are also received within the inner cavity of the rotating portion 132. The main housing 121 includes a second groove 1212 for accommodating the travel control assembly 14. Both the first and second traction ropes 141, 142 are received in the second groove 1212, thereby facilitating a thinner profile for the folding device 10. In this embodiment of the present application, the first and second grooves 1211, 1212 may be connected or disconnected.

[0079] During the rotation of the first and second housings 11 and 12, for example, during flattening, the first end displaces relative to the main housing 121, and the second end drives the secondary housing 122 to slide along the first direction D1, where the first direction is the direction extending perpendicularly between the first side v1 and the second side v2. Specifically, the first end rotates about the rotation axis 131 to provide a pulling force to the secondary housing 122 in the first direction D1, away from the rotation axis 131, thereby causing the secondary housing 122 to slide in the first direction D1, away from the rotation axis 131. For example, during the folding of the first and second housings 11 and 12, the third end displaces relative to the main housing 121, and the fourth end drives the secondary housing 122 to slide in the first direction D1. Specifically, the third end rotates about the rotation axis 131 to provide a pulling force to the secondary housing 122 in the first direction D1, toward the rotation axis 131, thereby causing the secondary housing 122 to slide in the first direction D1, toward the rotation axis 131.

[0080] It is understood that the first and second ends of the first traction rope 141 are not merely ends thereof, but may also have a certain length. For example, the portion of the first traction rope 141 that rotates about the rotation axis 131 is the first end. The third and fourth ends of the second traction rope 142 are not merely ends thereof, but may also have a certain length. For example, the portion of the second traction rope 142 that rotates about the rotation axis 131 is the third end.

[0081] Of course, in other embodiments, the first end of the first traction rope 141 can also be fixed to the first housing 11, for example, fixed to the connecting portion 112 of the first housing 11, and the second end of the first traction rope 141 can be fixed to the auxiliary housing 122, and / or the third end of the second traction rope 142 can be fixed to the first housing 11 and spaced apart from the first end, for example, fixed to the connecting portion 112 of the first housing 11, and the fourth end of the second traction rope 142 can be connected to the auxiliary housing 122. As long as the first traction rope 141 and the second traction rope 142 can drive the auxiliary housing 122 to slide along the first direction D1 during the flattening and folding of the first housing 11 and the second housing 12.

[0082] During the process of flattening and folding, the folding device 10 in the embodiment of the present application rotates around the rotating shaft 131 through the first traction rope 141 and the second traction rope 142 of the stroke control assembly 14 to provide a pulling force along the first direction D1 away from or toward the rotating shaft 131 for the secondary housing 122, so that the secondary housing 122 slides along the first direction D1 away from or toward the rotating shaft 131. That is, during the process of flattening or folding the folding device 10, that is, during the process of flattening or folding the first housing 11 and the second housing 12, the secondary housing 122 not only rotates relative to the first housing 11, but also slides along the first direction D1 away from or toward the rotating shaft 131. Therefore, the secondary housing 122 of the folding device 10 can adjust the distance it slides along the first direction D1 away from or toward the rotating shaft 131 (or the first housing 11) according to the different states of the flexible display screen 20 of the electronic device 100 when folded and flattened, that is, the different areas of the flexible display screen 20 located on the rotating shaft assembly 13 when folded and flattened. It can be understood that the secondary housing 122 During the rotation relative to the first housing 11, the flexible display screen 20 is driven to extend in the sliding direction (first direction D1) of the secondary housing 122, so that the flexible display screen 20 remains flat when the first housing 11 and the second housing 12 are in a flat state, thereby preventing the flexible display screen 20 of the electronic device 100 from arching when flattened. When the first housing 11 and the second housing 12 are in a folded state, the flexible display screen 20 is prevented from being excessively stretched and damaged, thereby ensuring that the flexible display screen 20 always adheres to the folding device 10, thereby increasing the service life of the flexible display screen 20, achieving an aesthetically pleasing appearance of the electronic device 100, and improving user experience.

[0083] At the same time, the present application forms a closed-loop pulling structure by respectively setting a first traction rope 141 and a second traction rope 142 to pull the sub-shell 122. When the first shell 11 and the second shell 12 are flattened or folded, the first traction rope 141 and the second traction rope 142 respectively pull the sub-shell 122 to slide along the first direction D1 back to or toward the rotating shaft 131, so that the sub-shell 122 adapts to the state change of the flexible display screen 20, ensures that the flexible display screen 20 is always in contact with the folding device 10, improves the service life of the flexible display screen 20, realizes the beautiful appearance of the electronic device 100, and improves the user experience.

[0084] Of course, in other embodiments, the travel control component 14 may also only include the first traction rope 141. When the first shell 11 and the second shell 12 are folded, other structures, such as a support member, pull the sub-shell 122 to slide along the first direction D1 toward the rotating shaft 131, so that the sub-shell 122 adapts to the change in the state of the flexible display screen 20, ensuring that the flexible display screen 20 is always in contact with the folding device 10, thereby improving the service life of the flexible display screen 20, achieving a beautiful appearance of the electronic device 100, and improving the user experience.

[0085] In the embodiment of the present application, the first traction rope 141 and the second traction rope 142 may be cylindrical, flat, or in other shapes. The first traction rope 141 and the second traction rope 142 include, but are not limited to, steel wire, nylon rope, braided rope, etc. The first traction rope 141 and the second traction rope 142 may also be made of a mixture of metal and non-metal materials to ensure that the first traction rope 141 and the second traction rope 142 have a certain strength and are not easily broken during rotation.

[0086] In one possible implementation of the embodiment of the present application, Figure 6 and Figure 7 , Figure 7 yes Figure 3 The cross-sectional structural diagram of the folding device shown in the BB direction.

[0087] The rotation direction of the rotating shaft 131 includes a second direction W1 and a third direction W2. The first end of the first traction rope 141 and the third end of the second traction rope 142 are fixed around the rotating shaft 131 along the second direction W1 and the third direction W2 respectively. It can be understood that the second direction W1 is the direction in which the rotating shaft 131 rotates when the first shell 11 and the second shell 12 are unfolded, and the third direction W2 is the direction in which the rotating shaft 131 rotates when the first shell 11 and the second shell 12 are folded. When the first end of the first traction rope 141 and the third end of the second traction rope 142 are fixed around the rotating shaft 131 from the first direction W1 and the third direction W2 respectively, when the first shell 11 and the second shell 12 are unfolded, the first end of the first traction rope 141 rotates around the rotating shaft 131 to provide a force to pull the sub-shell 122 to slide along the first direction D1 away from the rotating shaft 131. When the first shell 11 and the second shell 12 are folded, the third end of the second traction rope 142 rotates around the rotating shaft 131 to provide a force to pull the sub-shell 122 to slide along the first direction D1 toward the rotating shaft 131.

[0088] In this implementation, the first end of the first traction rope 141 and the third end of the second traction rope 142 are fixed around the rotating shaft 131 in different directions, so that when the first shell 11 and the second shell 12 are folded or flattened, different traction ropes are wound around the rotating shaft 131 in different directions, so as to pull the sub-shell 122 to slide along the first direction D1 away from or toward the rotating shaft 131.

[0089] Of course, in other implementations, the first end of the first traction rope and the third end of the second traction rope are both fixed around the rotation axis along the second direction. Alternatively, the first end of the first traction rope and the third end of the second traction rope can also be fixed around the rotation axis along the third direction.

[0090] The first end of the first traction rope 141 and the third end of the second traction rope 142 may be fixed to the rotating shaft 131 by bonding, or the first end of the first traction rope 141 and the third end of the second traction rope 142 may be fixed to the rotating shaft 131 by other connection methods such as snap connection.

[0091] Figure 6 and Figure 7 In the illustrated embodiment, the first end of the first traction rope 141 and the third end of the second traction rope 142 are fixed to the rotating shaft 131 by a clamping connection. Specifically, the first end of the first traction rope 141 and the third end of the second traction rope 142 are clamped in the rotating shaft 131. At the same time, the cavity wall of the rotating portion 132 corresponding to the first end of the first traction rope 141 and the third end of the second traction rope 142 is provided with an avoidance groove to provide space for the first end of the first traction rope 141 and the third end of the second traction rope 142 to rotate around the rotating shaft 131. At the same time, the connection between the first end of the first traction rope 141 and the third end of the second traction rope 142 and the rotating shaft 131 does not increase the volume of the rotating assembly 13, which is conducive to the miniaturization of the rotating shaft assembly 13.

[0092] In the embodiment of the present application, the stroke control component 14 may further include a pulley 143, which is arranged on the main shell 121. The first traction rope 141 and / or the second traction rope 142 change the direction of the force through the pulley 143 so that the first traction rope 141 and the second traction rope 142 drive the auxiliary shell 122 to slide along the first direction D1.

[0093] like Figure 3 In the illustrated embodiment, there are multiple pulleys 143, which are spaced apart in the second groove 1212 to facilitate thinning of the folding device 10. The second traction rope 142 changes the direction of the force applied to the auxiliary housing 122 through the multiple pulleys 143. The second traction rope 142 of the stroke control assembly 14 in this embodiment rotates around the pulley 143 to adjust the direction of the force applied to the auxiliary housing 122, thereby pulling the auxiliary housing 122 to slide along the first direction D1 toward the rotating shaft 131, so that the auxiliary housing 122 adapts to the state changes of the flexible display 20, ensuring that the flexible display 20 is always in contact with the folding device 10, thereby increasing the service life of the flexible display 20, achieving a beautiful appearance of the electronic device 100, and improving the user experience.

[0094] In this embodiment, the outer circumference of the pulley 143 is the circumferential surface in contact with the second traction rope 142. The outer circumference of the pulley 143 can be flat, and can also be provided with a limiting groove. The second traction rope 142 is disposed in the limiting groove so that the second traction rope 142 is limited to the pulley 143 during the sliding process relative to the pulley 143, thereby preventing the second traction rope 142 from falling off the pulley 143 during the sliding process. Similarly, when the pulley 143 is used to change the direction of the force of the first traction rope 141, the outer circumference of the pulley 143 can also be provided with a limiting groove to limit the first traction rope 141.

[0095] See also Figure 3 and Figure 6 In this embodiment, the stroke control assembly 14 further includes a stroke amplifier 144. The stroke amplifier 144 is connected between the auxiliary housing 122 and the second end of the first traction rope 141 and the fourth end of the second traction rope 142. The second end of the first traction rope 141 and the fourth end of the second traction rope 142 are respectively disposed on opposite sides of the stroke amplifier 144. The stroke amplifier 144 is configured to cause the auxiliary housing 122 to slide in the first direction D1 away from the rotation axis 131 by a greater distance than the first end of the first traction rope 141 rotates around the rotation axis 131, and to cause the auxiliary housing 122 to slide in the first direction D1 toward the rotation axis 131 by a greater distance than the third end of the second traction rope 142 rotates around the rotation axis 131.

[0096] Please also refer to Figure 2 It is understood that during the transition of the first and second shells 11, 12 from the folded state to the flattened state, the distance that the flexible display screen 20 extends in the sliding direction (first direction D1) of the secondary shell 122 is the distance that the secondary shell 122 should slide along the first direction D1 away from the rotation axis 131. The distance that the flexible display screen 20 extends in the sliding direction of the secondary shell 122 is specifically the distance that the flexible display screen 20 rotates around the rotating portion 132 mounted on the rotation axis 131. Since the distance that the first end of the first traction rope 141 rotates around the rotation axis 131 is less than the distance that the flexible display screen 20 rotates around the rotating portion 132, a travel amplifier 144 is provided between the first traction rope 141 and the secondary shell 122 to amplify the distance that the first end of the first traction rope 141 rotates around the rotation axis 131. This ensures that the distance that the secondary shell 122 slides away from the rotation axis 131 is equal to the distance that the flexible display screen 20 rotates around the rotating portion 132, thereby achieving synchronous movement of the flexible display screen 20 and the secondary shell 122. When the first and second housings 11, 12 switch from the flattened state to the folded state, the function of the travel amplifier 144 is similar to that described above and will not be further elaborated. The travel amplifier 144 ensures that the flexible display 20 remains in contact with the folding device 10 when the electronic device 100 switches between the folded and flattened states, thereby increasing the service life of the flexible display 20, ensuring an aesthetically pleasing appearance for the electronic device 100, and enhancing the user experience.

[0097] In the embodiment of the present application, the distance that the auxiliary housing 122 slides along the first direction D1 away from the rotating shaft 131 is N times the distance that the first end of the first traction rope 141 rotates around the rotating shaft 131, that is, the magnification of the stroke amplifier 144 is N times, where N = R1 / R2, R1 = R 11 +T,R 11 R2 is the distance from the surface of the main housing 121 facing away from the rotating shaft 131 to the axis center of the rotating shaft 131, T is the distance from the neutral layer of the flexible display 20 to the surface of the main housing 121 facing away from the rotating shaft, and R3 is the distance from the first end of the first traction rope 141, located on the outer periphery of the rotating shaft 131, to the axis center of the rotating shaft 131. It will be understood that the neutral layer of the flexible display 20 is typically the layer between the surface of the flexible display 20 facing the main housing 121 and the surface of the flexible display 20 facing away from the main housing 121. For example, if the combined thickness of the support member 30 and the flexible display 20 is 1 mm, the distance from the neutral layer of the flexible display 20 to the surface of the main housing 121 facing away from the rotating shaft 131 is between 0 mm and 1 mm. Of course, in other embodiments, the multiple of the stroke amplifier 144 can be set according to actual needs.

[0098] By limiting the distance that the sub-shell 122 slides along the first direction D1 toward the rotating shaft 131 to N times the distance that the first end of the first traction rope 141 rotates around the rotating shaft 131, the distance that the sub-shell 122 slides along the first direction D1 toward the rotating shaft 131 is equal to the distance that the flexible display screen 20 rotates around the rotating part 132, thereby enabling the flexible display screen 20 and the sub-shell 122 to move synchronously, so as to ensure that when the electronic device 100 switches between the folded state and the flattened state, the flexible display screen 20 is always in contact with the folding device 10, thereby improving the service life of the flexible display screen 20, achieving a beautiful appearance of the electronic device 100, and improving the user experience.

[0099] The stroke amplifying member 144 in the embodiment of the present application has multiple implementations, as follows:

[0100] In one embodiment, Figure 3 and Figure 8 As shown, Figure 8 yes Figure 3 A partial enlarged schematic diagram of region I of the electronic device shown.

[0101] The stroke amplifying member is a lever 144, which is disposed within the second groove 1212 and facilitates the thinning of the folding device 10. Lever 144 includes a central portion 1441 and a first end 1442 and a second end 1443 connected to either side of the central portion 1441. Central portion 1441 is rotatably mounted on the bottom wall of the second groove 1212 of the main housing 121. The second end of the first traction rope 141 and the fourth end of the second traction rope 142 are respectively connected to either side of the first end 1442, while the second end 1443 is connected to the auxiliary housing 122.

[0102] When the first end of the first pulling rope 141 rotates around the rotating shaft 131, the second end of the first pulling rope 141 pulls the first end portion 1442 toward the rotating shaft 131, causing the second end portion 1443 to push the auxiliary housing 122 to slide along the first direction D1 away from the rotating shaft 131. When the third end of the second pulling rope 142 rotates around the rotating shaft 131, the fourth end of the second pulling rope 142 pulls the first end portion 1442 toward the rotating shaft 131 in the first direction D1, causing the second end portion 1443 to push the auxiliary housing 122 to slide along the first direction D1 toward the rotating shaft 131.

[0103] The main housing 121 not only drives the auxiliary housing 122 to rotate relative to the first housing 11, but also fixes the lever 144 so that the first end 1442 and the second end 1443 of the lever 144 can move in opposite directions to push the auxiliary housing 122 to slide along the first direction D1 away from or toward the rotating shaft 131.

[0104] In this embodiment, the lever 144 is fixed to the main housing 121 to achieve the setting of the magnification factor of the lever 144. Of course, in other embodiments, the stroke amplifier 144 is not limited to the structure described above, as long as it can amplify the distance that the first end of the first traction rope 141 and the third end of the second traction rope 142 rotate around the rotation axis 131.

[0105] In another embodiment, see Figure 9-10 , Figure 9 yes Figure 3 A schematic structural diagram of another embodiment of the folding device shown; Figure 10 yes Figure 9 A partial structural diagram of the folding device shown.

[0106] The stroke amplifier 144 may include a gear 1444 and a connecting block 1445. The gear 1444 and the connecting block 1445 are disposed within the second recess 1212, facilitating a thinner profile for the folding device 10. The gear 1444 includes a third end d1 and a fourth end d2 disposed opposite each other. The third end d1 is connected to the main housing 121, and the fourth end d2 is connected to the auxiliary housing 122. The connecting block 1445 is connected between the third end d1 and the fourth end d2 and is adjacent to the fourth end d2. The gear 1444 is rotatable relative to the connecting block 1445. The second end of the first traction rope 141 and the fourth end of the second traction rope 142 are connected to opposite sides of the connecting block 1445. Specifically, the third end d1 and the fourth end d2 are respectively engaged with the main housing 121 and the auxiliary housing 122. Of course, the third end d1 and the fourth end d2 may also be connected to the main housing 121 and the auxiliary housing 122, respectively, through other connection methods.

[0107] When the first end of the first pulling rope 141 rotates around the rotating shaft 131, the second end of the first pulling rope 141 pulls the gear 1444 to move away from the rotating shaft 131, so that the fourth end d2 drives the auxiliary housing 122 to slide along the first direction D1 away from the rotating shaft 131. When the third end of the second pulling rope 142 rotates around the rotating shaft 131, the fourth end of the second pulling rope 142 pulls the gear 1444 to move toward the rotating shaft 131, so that the fourth end d2 drives the auxiliary housing 122 to slide along the first direction D1 toward the rotating shaft 131.

[0108] The second end of the first traction rope 141 and the fourth end of the second traction rope 142 are connected to the gear 1444 via a connecting block 1445, and the gear 1444 is rotatable relative to the connecting block 1445. Therefore, when the second end of the first traction rope 141 and the fourth end of the second traction rope 142 pull the connecting block 1445, the gear 1444 is forced to move and rotate appropriately, thereby more smoothly driving the auxiliary housing 122 to slide in the first direction D1 away from the rotating shaft 131. In this embodiment, the magnification of the lever 144 is set by setting the distance between the third end d1 and the fourth end d2 and the connecting block 1445.

[0109] Of course, in other embodiments, the travel amplifier 144 may simply include a gear, with the first and second traction ropes respectively connected between the third and fourth ends and proximate to the fourth end. The travel amplifier is not limited to the structure described above, as long as it can amplify the distance that the first end of the first traction rope and the third end of the second traction rope can rotate about the rotation axis.

[0110] In this embodiment, there are multiple pulleys 143, and the outer periphery of the pulley 143 is the circumferential surface that contacts the second traction rope 142. The outer periphery of the pulley 143 is provided with a limiting groove 1431. The first traction rope and / or the second traction rope are arranged in the limiting groove 1431, so that the first traction rope and / or the second traction rope are limited on the pulley 143 during the sliding process relative to the pulley 143, thereby preventing the first traction rope and / or the second traction rope from falling off the pulley 143 during the sliding process. Of course, in other embodiments, the outer periphery of the pulley can be flat.

[0111] In a possible implementation scenario of this embodiment, if Figure 10 The first traction rope 141 and the second traction rope 142 respectively change the direction of the force through different multiple pulleys 143 to adjust the directions of the forces applied by the two to the stroke amplifier 144 to be opposite, thereby pulling the sub-shell 122 to slide along the first direction D1 back or toward the rotating shaft 131, so that the sub-shell 122 can adapt to the state change of the flexible display screen 20, ensure that the flexible display screen 20 is always in contact with the folding device 10, improve the service life of the flexible display screen 20, realize the beautiful appearance of the electronic device 100, and improve the user experience.

[0112] In this embodiment, the first end of the first traction rope 141 and the third end of the second traction rope 142 are fixed to the rotating shaft 131 by bonding. Specifically, the rotating shaft 131 includes a fixing portion 1310. The first end of the first traction rope 141 and the third end of the second traction rope 142 are respectively changed in path by a plurality of pulleys 143 so that the first end of the first traction rope 141 and the third end of the second traction rope 142 can be wound around the same fixing portion 1310.

[0113] Please refer to Figure 11 and Figure 12 , Figure 11 yes Figure 10 The cross-sectional structural diagram of the folding device in the CC direction is shown; Figure 12 yes Figure 10 The cross-sectional structural diagram of the folding device in the DD direction is shown.

[0114] The outer peripheral surface of the fixing portion 1310 includes a groove 1 and a groove 2. The first end of the first traction rope 141 and the third end of the second traction rope 142 are respectively fixed on the fixing portion 1310 at intervals. When the first end of the first traction rope 141 and the third end of the second traction rope 142 rotate around the rotating shaft 131, the first end of the first traction rope 141 is accommodated in the groove 1, and the third end of the second traction rope 142 is accommodated in the groove 2. The first end of the first traction rope 141 and the third end of the second traction rope 142 can be more firmly fixed to the rotating shaft 131 through the fixing portion 1310. At the same time, grooves 1 and 2 are provided on the outer peripheral surface of the fixing portion 1310. Therefore, when the first end of the first traction rope 141 and the third end of the second traction rope 142 rotate around the rotating shaft 131, there is no need for the rotating shaft assembly 13 to reserve additional space for the first end of the first traction rope 141 and the third end of the second traction rope 142, which is conducive to the miniaturization of the rotating shaft assembly 13, and further conducive to the miniaturization of the folding device 10, thereby improving the lightness and thinness of the electronic device 100 and improving the user experience.

[0115] In this embodiment, the bottom walls of grooves 1 and 2 are both provided with card slots, and the first end of the first traction rope 141 and the third end of the second traction rope 142 are clamped in the corresponding card slots, so that the first end of the first traction rope 141 and the third end of the second traction rope 142 are more firmly fixed on the fixing part 1310. At the same time, the card slots are provided on the bottom walls of grooves 1 and 2, which is conducive to the miniaturization of the rotating shaft assembly 13.

[0116] In another possible implementation scenario of this embodiment, please refer to Figure 13 , Figure 13 yes Figure 9 A schematic structural diagram of another embodiment of a folding device is shown.

[0117] The first traction rope 141 changes the direction of the force applied to the auxiliary housing 122 via a plurality of pulleys 143. In this embodiment, the first traction rope 141 of the stroke control assembly 14 adjusts the direction of the force applied to the auxiliary housing 122 by rotating around the pulleys 143, thereby pulling the auxiliary housing 122 to slide in the first direction D1 away from the rotation shaft 131.

[0118] In one possible implementation of this scenario, see Figure 14 , Figure 14 yes Figure 13 A partial structural diagram of the folding device shown.

[0119] The first end of the first traction rope 141 and the third end of the second traction rope 142 are both fixed around the rotating shaft 131 along the second direction W1, that is, the first end of the first traction rope 141 and the third end of the second traction rope 142 are both fixed around the rotating shaft 131 along the same direction, and the rotating shaft 131 includes a first part 1311, a second part 1312 and a reverse component 1313 connected between the first part 1311 and the second part 1312. The first end of the first traction rope 141 is fixed around the first part 1311, and the third end of the second traction rope 142 is fixed around the second part 1312. The reverse component 1313 is used to make the rotation directions of the first part 1311 and the second part 1312 opposite.

[0120] Specifically, the second direction W1 is the direction in which the first part 1311 of the rotating shaft 131 rotates when the first shell 11 and the second shell 12 are flattened. The first part 1311 will rotate through the reverse component 1313 during rotation, and the reverse component 1313 is used to make the rotation direction of the second part 1312 opposite to the second direction W1. Therefore, when the first end of the first traction rope 141 and the third end of the second traction rope 142 are both fixed around the rotating shaft 131 along the second direction W1, the rotating shaft 131 is divided into two parts, and a reverse component 1313 is set between the two parts of the rotating shaft 131 to make the rotation directions of the two parts of the rotating shaft 131 opposite, so that when the first shell 11 and the second shell 12 are flattened or folded, the first end of the first traction rope 141 and the third end of the second traction rope 142 can respectively pull the sub-shell 122 to slide along the first direction D1 away from or toward the rotating shaft 131.

[0121] In this implementation scenario, the reversing assembly 1313 includes a first gear b1, a second gear b2, and a third gear b3. The second gear b2 is toothed on both sides with the first gear b1 and the third gear b3, respectively. The rotation axis 131 of the second gear b2 is perpendicular to the first and third gears b1 and b3. The portion of the first gear b1 facing away from the third gear b3 is axially connected to the first portion 1311, so that the first gear b1 rotates as the first portion 1311 rotates. The first gear b1 transmits rotation to the second gear b2, which rotates perpendicularly to the first gear b1. The second gear b2 transmits rotation to the third gear b3, so that the third gear b3 rotates in the opposite direction to that of the first gear b1. The third gear b3 is axially connected to the second portion 1312, so that the third gear b3 drives the second portion 1312 to rotate in the opposite direction to the first portion 1311. Of course, in other embodiments, the structure of the reversing assembly 1313 is not limited to the above description, as long as it can cause the first and second portions 1311 and 1312 to rotate in opposite directions.

[0122] In another possible implementation of this embodiment, the first end of the first traction rope and the third end of the second traction rope can also be fixed around the rotation axis along the third direction. When the first end of the first traction rope and the third end of the second traction rope are both fixed around the rotation axis along the third direction, the rotation axis also needs to be divided into two parts, and a reverse assembly is provided between the two parts. The operating principle is the same as when the first end of the first traction rope and the third end of the second traction rope are both fixed around the rotation axis along the second direction, and will not be further described.

[0123] In another possible implementation of this embodiment scenario, the first end of the first traction rope and the first end of the second traction rope can also be fixed around the rotation axis along the second direction and the third direction respectively.

[0124] In another embodiment, please refer to Figure 15 and Figure 16 , Figure 15 yes Figure 3 A schematic structural diagram of another embodiment of the folding device shown; Figure 16 yes Figure 15 A schematic diagram of the partial structure of the folding device shown.

[0125] The stroke amplifier is a slider 144, which includes a connected fixed part c1 and a limiting part c2. A slide groove 1213 is provided on the main shell 121, and the slider 144 is located in the slide groove 1213. The fixed part c1 is connected to the second end of the first traction rope 141. The auxiliary shell 122 includes a through groove 1222. The auxiliary shell 122 partially covers the main shell 121, and the limiting part c2 is limited in the through groove 1222. When the first end of the first traction rope 141 rotates around the rotating shaft 131, the second end of the first traction rope 141 pulls the slider 144 to slide, and the slider 144 drives the auxiliary shell 122 to slide along the first direction D1 away from the rotating shaft 131 through the limiting part c2.

[0126] In this embodiment, the through groove 1222 and the slide groove 1213 are both long strips, and the length direction of the through groove 1222 is perpendicular to the length direction of the slide groove 1213. The first traction rope 141 changes the direction of its force through the pulley 143 so that the angle between the parts of the first traction rope 141 on both sides of the pulley 143 is θ. When the first end of the first traction rope 141 rotates around the rotating shaft 131 for a distance M, the second end of the first traction rope 141 drives the sub-shell 122 to move a distance M / COSθ, that is, the magnification of the slider 144 is N=R1 / R2=1 / COSθ, that is, the magnification of the slider 144 is set by setting the angle between the parts of the first traction rope 141 on both sides of the pulley 143.

[0127] When the first shell 11 and the second shell 12 switch from the folded state to the flattened state, the first end of the first traction rope 141 rotates around the rotating shaft 131, pulling the slider 144 from the first position L1 of the slide groove 1213 to the second position L2, and at the same time the limiting part c2 moves from the first position L3 of the through groove 1222 to the second position L4 of the through groove 1222, so that the sub-shell 122 slides away from the rotating shaft 131.

[0128] In this embodiment, the limiting portion c2 is circular and can rotate relative to the fixed portion 1310. When limiting the through slot 1222, it can rotate relative to the through slot 1222 to reduce the friction between the limiting portion c2 and the through slot 1222, so that the limiting portion c2 can move more smoothly from the first position L3 of the through slot 1222 to the second position L4 of the through slot 1222.

[0129] In one implementation scenario of this embodiment, when the first shell and the second shell are switched from the flattened state to the folded state, the support member pulls the sub-shell to slide along the first direction toward the rotating shaft. That is, the stroke control assembly in this implementation scenario does not include a second traction rope. Specifically, since the opposite sides of the support member are respectively connected to the first shell and the sub-shell, during the folding process of the first shell and the second shell, when the first shell and the second shell are flattened, part of the support member located in the second shell will be wrapped around the outside of the rotating shaft to pull the sub-shell to slide along the first direction toward the direction close to the rotating shaft, thereby driving the flexible display and the sub-shell to move synchronously. In other words, the support member plays the role of supporting the flexible display and moving the sub-shell, thereby saving the second traction rope, simplifying the structure of the folding device, and improving the lightness and thinness of the electronic device. This implementation scenario can also be understood as the flexible display and the support member jointly pulling the sub-shell to slide.

[0130] In another implementation scenario of this embodiment, during the folding process of the first and second shells, the secondary shell is pulled to slide in the first direction toward the rotation axis by other structures such as a second traction rope. For example, the second traction rope is fixed to the slider and is located on opposite sides of the slider as the first traction rope. When the first and second shells switch from the flattened state to the folded state, the second traction rope rotates around the rotation axis to pull the secondary shell in the first direction toward the rotation axis via the slider. Simultaneously, the secondary shell is pulled to rotate in the first direction toward the rotation axis via the support member and the second traction rope.

[0131] In another implementation scenario of this embodiment, the flexible display is directly provided on the first shell and the second shell, that is, no support member is provided between the flexible display and the first shell and the second shell, and the opposite sides of the flexible display are respectively connected to the first shell and the secondary shell. When the first shell and the second shell switch from the flat state to the folded state, the secondary shell is pulled by the flexible display to slide along the first direction toward the rotation axis. It is understandable that because the opposite sides of the flexible display are respectively connected to the first shell and the secondary shell, during the folding process of the first shell and the second shell, the portion of the flexible display located in the second shell when the first shell and the second shell are flattened will wrap around the outside of the rotation axis, pulling the secondary shell to slide along the first direction toward the rotation axis.

[0132] In another implementation scenario, see Figure 17 , Figure 17 yes Figure 3 A schematic structural diagram of another embodiment of a folding device is shown.

[0133] The stroke amplifier is a lever 144, which is located within the second groove 1212 and facilitates the thinning of the folding device 10. Lever 144 includes a central portion e1 and a fifth end e2 and a sixth end e3 connected to either side of the central portion e1. The central portion e1 is rotatably mounted on the bottom wall of the second groove 1212 of the main housing 121. The second end of the first pulling rope 141 is connected to the fifth end e2, and the sixth end e3 is connected to the auxiliary housing 122. The fourth end of the second pulling rope 142 is connected to the lever near the sixth end e3.

[0134] When the first end of the first pulling rope 141 rotates around the rotating shaft 131, the second end of the first pulling rope 141 pulls the fifth end e2 toward the rotating shaft 131, causing the sixth end e3 to push the auxiliary housing 122 to slide along the first direction D1 away from the rotating shaft 131. When the third end of the second pulling rope 142 rotates around the rotating shaft 131, the fourth end of the second pulling rope 142 pulls the auxiliary housing 122 via the sixth end e3 to slide along the first direction D1 toward the rotating shaft 131.

[0135] In this embodiment, the first traction rope 141 and the second traction rope 142 are directly fixed to the lever 144, and the lever 144 changes the direction of the force applied by the first traction rope 141 to the auxiliary housing 122. Therefore, there is no need to provide a pulley to change the direction of the force applied by the second traction rope 142 to the auxiliary housing 122, which simplifies the structure of the folding device 10, improves the lightness and thinness of the folding device 10, and reduces the production cost of the folding device 10.

[0136] In this embodiment, the first and second traction ropes 141, 142 are flat, strip-shaped. They are made of a mixture of metal and non-metal materials to ensure they have a certain strength and resist breakage during rotation. Of course, the first and second traction ropes 141, 142 can also be cylindrical or other shapes. They can also include, but are not limited to, steel wire, nylon rope, braided rope, etc.

[0137] In this embodiment, the lever 144 is fixed to the main housing 121 to achieve the setting of the magnification factor of the lever 144. Of course, in other embodiments, the stroke amplifier 144 is not limited to the structure described above, as long as it can amplify the distance that the first end of the first traction rope 141 and the third end of the second traction rope 142 rotate around the rotation axis 131.

[0138] The main housing 121 not only drives the auxiliary housing 122 to rotate relative to the first housing 11, but also fixes the lever 144 so that the fifth end e2 and the sixth end e3 of the lever 144 can move in opposite directions to push the auxiliary housing 122 to slide along the first direction D1 away from or toward the rotating shaft 131.

[0139] In the embodiment of the present application, the number of the stroke control components 14 can be multiple, and the multiple stroke control components 14 are arranged in sequence along the direction in which the rotating shaft 131 extends. By setting the number of the stroke control components 14 to multiple, the stroke control components 14 can provide sufficient force to pull the auxiliary housing 122 to slide relative to the rotating shaft 131. Of course, the number of the stroke control component 14 can also be one. For example, Figure 3 In the embodiment shown, the stroke control assembly 14 is correspondingly two, and the two stroke control assemblies 14 are respectively arranged near the two ends of the length direction of the rotating shaft 131, so as to ensure the force balance of the sub-shell 122 while providing a sufficiently large pulling force for the sub-shell 122, so that the sub-shell 122 can slide more smoothly relative to the rotating shaft 131.

[0140] It is understood that in the aforementioned embodiment, the width direction X of the electronic device 100 is perpendicular to the rotation axis 31 of the hinge assembly 13, and the electronic device 100 can be a structure that folds left and right. In other embodiments, the width direction of the electronic device 100 can also be parallel to the rotation axis 130 of the hinge assembly 13, and the electronic device 100 can be a structure that folds up and down. This application is not strictly limited to this.

[0141] It will be appreciated that the aforementioned embodiments illustrate the electronic device 100 as a two-fold structure (i.e., capable of being folded once). In other embodiments, the electronic device 100 may also be a three-fold structure (i.e., capable of being folded twice), or a four-fold structure (i.e., capable of being folded three times), etc. For the specific structural design of the electronic device 100, please refer to the aforementioned embodiments. For example, the electronic device 100 further includes a third straight region, which is connected to the first straight region a1 or the second straight region a3 via another curved region.

[0142] The above are only some of the embodiments and implementations of this application. The scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in 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 folding device, characterized in that: The folding device includes a first shell, a second shell and a stroke control assembly; The second housing includes a main housing and a secondary housing, the main housing includes a first side and a second side that are opposite to each other, the first housing and the first side are rotatably connected via a rotating shaft, and the secondary housing is located on one side of the second side; The travel control assembly includes a first traction rope, wherein a first end of the first traction rope is fixed to the rotating shaft or the first housing, and a second end of the first traction rope is fixed to the auxiliary housing. During relative rotation between the first housing and the second housing, the first end is displaced relative to the main housing, and the second end drives the auxiliary housing to slide along a first direction, where the first direction is a direction extending perpendicularly between the first side and the second side. The stroke control assembly also includes a stroke amplifier, which is connected between the auxiliary housing and the second end. The stroke amplifier is used to make the distance that the auxiliary housing slides along the first direction away from the rotating shaft be greater than the distance that the first end rotates around the rotating shaft.

2. The folding device according to claim 1, characterized in that: The first end is fixed to the outer periphery of the rotating shaft. When the first shell and the second shell are relatively flattened, the first end rotates around the rotating shaft so that the second end drives the auxiliary shell to slide along the first direction away from the rotating shaft.

3. The folding device according to claim 2, characterized in that: The distance that the auxiliary housing slides along the first direction away from the rotation axis is N times the distance that the first end rotates around the rotation axis, where N=R1 / R2, R1=R 11 +T,R 11 is the distance from the surface of the main shell facing away from the rotating shaft to the axis center of the rotating shaft, T is the distance from the neutral layer of the flexible display screen to the surface of the main shell facing away from the rotating shaft when the main shell carries the flexible display screen, and R2 is the distance from the first end located on the outer periphery of the rotating shaft to the axis center of the rotating shaft.

4. The folding device according to any one of claims 1 to 3, characterized in that: The stroke amplifier is a lever, which includes a middle part and a first end and a second end connected to both sides of the middle part. The middle part is rotatably arranged on the main shell, the second end is connected to the first end, and the second end is connected to the auxiliary shell. When the first end rotates around the rotating shaft, the second end pulls the first end toward the rotating shaft, so that the second end pushes the auxiliary shell to slide along the first direction away from the rotating shaft.

5. The folding device according to any one of claims 1 to 3, characterized in that: The stroke amplifier includes a gear, which includes a third end and a fourth end arranged opposite to each other, the third end is connected to the main housing, the fourth end is connected to the auxiliary housing, and the second end is connected between the third end and the fourth end and is close to the fourth end. When the first end rotates around the rotating shaft, the second end pulls the gear to move back to the rotating shaft, so that the fourth end drives the auxiliary housing to slide along the first direction back to the rotating shaft.

6. The folding device according to claim 5, characterized in that: The stroke amplifier also includes a connecting block, which is connected between the gear and the second end, and the gear can rotate relative to the connecting block. When the first end rotates around the rotating shaft, the second end pulls the gear back to the rotating shaft through the connecting block.

7. The folding device according to any one of claims 1 to 3, characterized in that: The stroke amplifier is a slider, which includes a connected fixed part and a limiting part. A slide groove is provided on the main housing, and the slider is located in the slide groove. The fixed part is connected to the second end. The auxiliary housing includes a through groove. The auxiliary housing partially covers the main housing. The limiting part is limited in the through groove. When the first end rotates around the rotating shaft, the second end pulls the slider to slide, and the slider drives the auxiliary housing to slide along the first direction back to the rotating shaft through the limiting part.

8. The folding device according to any one of claims 1 to 3, characterized in that: The stroke control assembly also includes a second traction rope, the third end of the second traction rope is connected to the outer periphery of the rotating shaft, the fourth end of the second traction rope is connected to the stroke amplifier, and is located on opposite sides of the stroke amplifier with the second end. During the folding process of the first shell and the second shell, the fourth end rotates around the rotating shaft to make the sub-shell slide along the first direction toward the rotating shaft.

9. The folding device according to claim 8, characterized in that: The stroke control assembly also includes a pulley, which is arranged on the main housing. The first traction rope and / or the second traction rope change the direction of force through the pulley so that the first traction rope and the second traction rope drive the auxiliary housing to slide along the first direction.

10. The folding device according to claim 9, characterized in that: The rotation direction of the rotating shaft includes a second direction and a third direction, and the first end and the third end are fixed around the rotating shaft along the second direction and the third direction respectively.

11. The folding device according to claim 9, characterized in that: The rotation direction of the rotating shaft includes a second direction and a third direction, the first end and the third end are both fixed around the rotating shaft along the second direction, or the first end and the third end are both fixed around the rotating shaft along the third direction; the rotating shaft includes a first part, a second part and a reverse component connected between the first part and the second part, the first end is fixed around the first part, the third end is fixed around the second part, and the reverse component is used to make the rotation directions of the first part and the second part opposite.

12. An electronic device, characterized in that: The electronic device includes a flexible display and the folding device according to any one of claims 1 to 11, and the flexible display is installed on the folding device.

13. The electronic device according to claim 12, wherein: The electronic device includes a support member, which is arranged between the flexible display screen and the folding device. The opposite sides of the support member are respectively connected to the first shell and the sub-shell. During the folding process of the first shell and the second shell, the support member pulls the sub-shell to slide along the first direction toward the direction close to the rotating shaft.

14. The electronic device according to claim 13, wherein: The support member includes a first support portion, a second support portion and a third support portion connected in sequence, the first support portion is located in the first shell, the third support portion is located in the second shell, the second support portion corresponds to the rotating shaft, and the second support portion is provided with a plurality of through holes.

15. The electronic device according to claim 14, characterized in that The first shell includes a receiving space, the receiving space is facing away from the flexible display screen, and the electronic components of the electronic device are all arranged in the receiving space.

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