Folding assembly and electronic equipment

Abstract

A folding assembly (3) and an electronic device (100), the electronic device (100) comprising a folding device (10) and a flexible display screen (20), the flexible display screen (20) being mounted on the folding device (10), the folding device (10) comprising a first housing (1), a second housing (2) and the folding assembly (3) connected between the first housing (1) and the second housing (2), the folding assembly (3) comprising a main shaft (31), a rotating arm (321), a fixing frame (322), a first connecting arm (323) and a second connecting arm (324), the first shell (1) is rotationally connected with the main shaft (31) through the rotating arm (321), the fixing frame (322) is fixed to the second shell (2), and the fixing frame (322) is movably connected with the main shaft (31) through the first connecting arm (323) and the second connecting arm (324). The number of parts of the folding assembly (3) is small, the structure is simple, and cost is low.

Description

Folding components and electronic devices

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 6, 2022, with application number 202211096853.0 and application name “Folding component and electronic device”, the entire contents of which are incorporated by reference into this application; this application claims priority to the Chinese patent application filed with the China Patent Office on January 31, 2023, with application number 202310117311.5 and application name “Folding component and electronic device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of foldable electronic products, and in particular to a foldable component and electronic equipment. Background Art

[0003] In recent years, flexible displays have been widely used in various foldable electronic devices due to their thinness, lightness, and resistance to breakage. These devices also include a folding mechanism for supporting the flexible display. This mechanism typically consists of two housings and a folding assembly connected between them. The two housings fold or unfold relative to each other through the deformation of the folding assembly, which in turn drives the flexible display to fold or unfold. However, current folding assemblies typically have a large number of parts and a complex structure, resulting in high costs.

[0004] Summary of the Invention

[0005] The present application provides a foldable assembly and an electronic device, wherein the foldable assembly has fewer parts, a simpler structure, and a lower cost.

[0006] In a first aspect, an embodiment of the present application provides an electronic device, comprising a folding device and a flexible display screen; the folding device comprises a first shell, a second shell and a folding assembly, and the folding assembly connects the first shell and the second shell; the flexible display screen and the corresponding parts of the first shell are fixed to the first shell, and the corresponding parts of the flexible display screen and the second shell are fixed to the second shell, and during the process of relative expansion or relative folding of the first shell and the second shell, the corresponding parts of the flexible display screen and the folding assembly are deformed; the folding assembly comprises a main shaft, a fixing frame, a rotating arm, a first connecting arm and a second connecting arm; the first end of the rotating arm is rotatably connected to the main shaft, and the second end of the rotating arm is fixedly connected to the first shell; the fixing frame is fixedly connected to the second shell; the first end of the first connecting arm is rotatably connected to the main shaft, and the second end of the first connecting arm is slidably connected to the fixing frame; the first end of the second connecting arm is rotatably connected to the main shaft, the rotation center of the first end of the second connecting arm does not coincide with the rotation center of the first end of the first connecting arm, and the second end of the second connecting arm is slidably connected or rotatably connected to the fixing frame.

[0007] In an embodiment of the present application, the folding component of the folding device adopts an asymmetric structure. The first shell is rotatably connected to the main shaft through a rotating arm, and the second shell is movably connected to the main shaft through a first connecting arm, a second connecting arm and a fixed frame to achieve relative movement between the first shell and the second shell. The folding component has fewer parts, a simpler structure, and a lower cost.

[0008] Furthermore, the connection between the second housing and the main shaft is achieved through the coordination of a dual-link slider mechanism, or the coordination of a link slider mechanism and a connecting rod mechanism. The second housing is capable of relative motion to the main shaft. This reduces the number of components, simplifies the coordination relationship and positioning, and makes the components easy to manufacture and assemble, facilitating mass production and reducing the cost of the folding device. Furthermore, because the main shaft is linked to the fixed frame via the first and second connecting arms, the movement path of the second housing is precise, facilitating accurate control of the folding device's motion configuration. Furthermore, the folding device exhibits superior mechanical tensile and compressive resistance.

[0009] In addition, since the first shell is connected to the main shaft through the rotating arm, after the first shell is rotated to a closed state relative to the main shaft, no concave space for accommodating the flexible display is reserved at the connection between the first shell and the main shaft, and the second shell is connected to the main shaft through the first connecting arm and the second connecting arm, for example, the main shaft is connected through a double-link slider mechanism or a connecting slider mechanism and a connecting rod mechanism cooperation mechanism. After the second shell is rotated to a closed state relative to the main shaft, a concave space for accommodating the flexible display can be reserved at the connection between the second shell and the main shaft. Therefore, when the first shell and the second shell are folded relative to each other to a closed state, a receiving space offset toward the second shell is formed between the first shell and the second shell and on the inner side of the folding assembly. Based on the shape of the receiving space offset to one side, compared with the symmetrical space of traditional folding electronic devices, the bending position of the part of the flexible display accommodated in the receiving space can be reduced, thereby helping to reduce the risk of damage to the flexible display, improve the reliability of the flexible display, and extend the service life of the flexible display.

[0010] In some possible implementations, the folding assembly further includes a synchronization assembly that engages the first end of the rotating arm and the first end of the first connecting arm. In the embodiment of the present application, the synchronization assembly synchronizes the rotation of the rotating arm relative to the main shaft and the rotation of the first connecting arm relative to the main shaft, thereby improving the user's operating experience of the mechanism.

[0011] In some possible implementations, the first end of the rotating arm includes a connecting gear, the synchronization assembly includes a first synchronization gear and a second synchronization gear, the first synchronization gear engages the connecting gear, and in the thickness direction of the main shaft, the first synchronization gear is located on the side of the connecting gear facing away from the flexible display screen, and the second synchronization gear engages the first synchronization gear and the first end of the first connecting arm.

[0012] In the embodiment of the present application, the upper and lower arrangement of the connecting gear and the first synchronous gear can make full use of the thickness space of the main shaft. The first synchronous gear and the connecting gear reuse part of the width space of the main shaft, which is beneficial to reducing the width dimension of the main shaft and realizing miniaturization of the main shaft.

[0013] The pitch circle diameter of the second synchronous gear can be different from that of the first synchronous gear to better match the position of the first synchronous gear and the first end of the first connecting arm, thereby achieving meshing transmission. Furthermore, since the second synchronous gear is a partial gear, the position of its teeth and toothless area can be adjusted to minimize the space required for its movement while ensuring meshing connection. This reduces the space required for the main shaft, such as the space required in the thickness direction of the main shaft, thereby facilitating a thinner main shaft.

[0014] In some possible implementations, the connecting gear is an incomplete gear, comprising a support surface and a tooth portion disposed opposite each other. When the first and second housings are unfolded relative to each other to an open state, the teeth of the connecting gear face the first synchronization gear and are located within the main shaft, with the support surface of the connecting gear flush with the support surface of the main shaft. In this case, the connecting gear can be used together with the main shaft to support the flexible display, thereby increasing the integrity and flatness of the supporting environment for the flexible display. Furthermore, the use of an incomplete gear reduces its own size while satisfying the connection relationship, thereby reducing the thickness of the main shaft on which the connecting gear is mounted, thereby facilitating a thinner main shaft.

[0015] When the first and second shells are folded together to close, the connecting gear rotates relative to the main shaft, with its teeth partially pivoting out of the main shaft, and its support surface facing the flexible display. At this point, the connecting gear can move in the space above the main shaft, leaving only a small space on the main shaft for the connecting gear to move. This helps reduce the thickness of the main shaft and achieves miniaturization.

[0016] In some possible implementations, the rotation center of the first synchronous gear is located farther from the second synchronous gear relative to the rotation center of the connecting gear in the width direction of the main shaft, and the width direction of the main shaft is perpendicular to the thickness direction of the main shaft and perpendicular to the extension direction of the main shaft. In the embodiment of the present application, the position of the rotation center of the first synchronous gear and the rotation center of the connecting gear can ensure that the first synchronous gear and the connecting gear are always in meshing state, preventing idling and improving the mechanical reliability of the folding device.

[0017] In some possible implementations, the first end of the rotating arm further includes an arcuate arm, the arcuate arm being fixed to one side of the connecting gear, with the central axis of the arcuate arm being collinear with the central axis of the connecting gear, and the arcuate arm being mounted in the arcuate slot of the main shaft to rotatably connect to the main shaft. In the embodiment of the present application, the arcuate arm at the first end of the rotating arm cooperates with the arcuate slot of the main shaft to achieve a rotational connection between the first end of the rotating arm and the main shaft via a virtual axis connection.

[0018] In some possible implementations, the rotation center of the first end of the second connecting arm is closer to the flexible display screen than the rotation center of the first end of the first connecting arm. In this case, the position of the rotation center of the first end of the first connecting arm can be adjusted to ensure linkage between the second connecting arm and other structures, and the positions of the rotation centers of the first ends of the second connecting arm and the first end of the first connecting arm can be adjusted to accommodate changes in the position of the fixing frame relative to the main axis.

[0019] In some possible implementations, when the second end of the second connecting arm is slidably connected to the fixing frame, a sliding direction of the second end of the second connecting arm relative to the fixing frame is not parallel to a sliding direction of the second end of the first connecting arm relative to the fixing frame.

[0020] In the embodiment of the present application, by rationally designing the sliding directions of the second end of the second connecting arm and the second end of the first connecting arm relative to the fixed frame, the rotation angles of the first connecting arm and the second connecting arm relative to the main axis are each no greater than 90°. Compared to existing solutions, this effectively reduces the rotation angle of the second connecting arm, thereby allowing the wall thickness of the local structure of the second connecting arm to be larger, and the wall thickness design meets the structural strength requirements, thereby improving the structural reliability of the second connecting arm. In addition, because the rotation angles of the first and second connecting arms are relatively small, the need to reduce the thickness of some components of the electronic device to avoid the rotation of the first and second connecting arms can be effectively avoided, thereby improving the reliability of the overall structure of the electronic device.

[0021] In some possible implementations, the fixed frame has a first surface, a second surface, a third surface, and a fourth surface. The first surface and the second surface are arranged opposite to each other, and the first surface is located between the flexible display screen and the second surface. The third surface and the fourth surface are arranged opposite to each other, and the third surface is located between the main axis and the fourth surface. The fixed frame includes a first slide groove and a second slide groove. The extension direction of the second slide groove is not parallel to the extension direction of the first slide groove. The openings at both ends of the first slide groove are respectively located on the first surface and the second surface. The openings at both ends of the second slide groove are respectively located on the third surface and the fourth surface. The slider at the second end of the first connecting arm is installed in the first slide groove and can slide relative to the fixed frame along the extension direction of the first slide groove; the slider at the second end of the second connecting arm is installed in the second slide groove and can slide relative to the fixed frame along the extension direction of the second slide groove.

[0022] In the embodiment of the present application, by setting the extension direction of the first slide groove and the second slide groove of the fixing frame, the sliding direction of the second end of the first connecting arm relative to the fixing frame and the sliding direction of the second end of the second connecting arm relative to the fixing frame are controlled, which is conducive to controlling the movement path of the fixing frame relative to the main axis, so that the electronic equipment obtains a more ideal accommodation space.

[0023] In some possible implementations, the folding assembly further includes a connecting rod, one end of which is rotatably connected to the first connecting arm, and the other end of which is rotatably connected to the second connecting arm. In this way, the first connecting arm, the connecting rod, the second connecting arm, and the main shaft can form a four-bar linkage, thereby preventing the first and second connecting arms from jamming during relative rotation of the first and second housings, thereby improving the reliability of the mechanism.

[0024] In some possible implementations, the folding assembly further includes a support plate connected to the fixing frame and further connected to the first connecting arm or the second connecting arm; when the first shell and the second shell are relatively unfolded to an open state, the first shell, the main shaft, the support plate, and the second shell jointly support the flexible display; the support plate includes a first end proximal to the main shaft and a second end distal to the main shaft; when the first shell and the second shell are relatively folded to a closed state, the distance between the first end of the support plate and the first shell is greater than the distance between the second end of the support plate and the first shell, thereby forming a receiving space between the support plate and the first shell, and the flexible display is at least partially received in the receiving space. The receiving space is a space that is narrow at the top and wide at the bottom and is biased toward the second shell.

[0025] In the embodiment of the present application, since the support plate is rotatably connected to the fixed frame and slidably connected to the second connecting arm, during the relative movement of the first shell and the second shell, the support plate moves under the drive of the fixed frame and the second connecting arm, and the movement path is accurate to meet the support requirements of the folding device for the flexible display screen in different forms.

[0026] In some possible implementations, the mounting frame has a first surface that faces the support plate. When the first housing and the second housing are relatively unfolded to an open state, a first angle is formed between the first surface and the support plate, and the distance between the end of the first surface closer to the main axis and the support plate is greater than the distance between the end of the first surface farther from the main axis and the support plate. When the first housing and the second housing are relatively folded to a closed state, the support plate rotates relative to the mounting frame and approaches the first surface, forming a second angle between the first surface and the support plate, the second angle being smaller than the first angle. That is, during the closing process of the electronic device, the support plate rotates relative to the mounting frame, and by approaching the mounting frame, a receiving space is formed.

[0027] In some possible implementations, the fixing frame further has a first rotation groove, which is an arc-shaped groove and extends from the first surface to the inside of the fixing frame; the support plate includes a plate body and a first rotating block, the plate body is used to support the flexible display screen when the first shell and the second shell are relatively unfolded to an open state, the first rotating block is fixed to the side of the plate body facing away from the flexible display screen, and the arc-shaped arm of the first rotating block extends from the plate body in a direction away from the main axis; the arc-shaped arm of the first rotating block is installed in the first rotation groove, and during the relative unfolding of the first shell and the second shell, a part of the arc-shaped arm of the first rotating block rotates out of the first rotation groove, and during the relative folding of the first shell and the second shell, a part of the arc-shaped arm of the first rotating block rotates into the first rotation groove.

[0028] In some possible implementations, the flexible display includes a first part, a second part and a third part, the third part is connected between the first part and the second part, the first part is fixed to the first shell, and the second part is fixed to the second shell; when the first shell and the second shell are folded relative to each other to a closed state, the third part is at least partially accommodated in the accommodation space, and the middle part of the third part is offset toward the direction close to the second shell.

[0029] In the embodiment of the present application, since the accommodation space is offset toward the second shell, the flexible display screen is deformed along with the accommodation space, and the third part of the flexible display screen is biased toward the second shell. Compared with the symmetrical deformation of the traditional flexible display screen, the third part of the flexible display screen of the present application has fewer bending positions, which is beneficial to reduce the risk of damage to the flexible display screen, improve the reliability of the flexible display screen, and extend the service life of the flexible display screen.

[0030] In some possible implementations, the third portion includes a first segment, a second segment, a third segment, and a fourth segment, which are sequentially connected. The first segment connects to the first portion, and the fourth segment connects to the second portion. When the first and second housings are folded relative to each other into a closed state, the second and fourth segments become curved segments, and the second and third segments deviate toward the second housing. In this case, the flexible display is bent between the second and fourth segments.

[0031] In some possible implementations, a flexible display includes a flexible display panel and a carrier plate. The carrier plate is fixed to the non-display side of the flexible display panel and has a greater rigidity than the flexible display panel. The carrier plate is used to provide rigid support for the flexible display panel and is bendable to increase the support strength of the flexible display.

[0032] The support plate includes a first plate portion located in the first section, a second plate portion located in the second section, a third plate portion located in the third section, and a fourth plate portion located in the fourth section. The first and third plate portions have greater rigidity than the second and fourth plate portions. The second and fourth plate portions have less rigidity, making them easier to bend while supporting the flexible display panel.

[0033] In some possible implementations, the second and fourth plate portions can be reduced in rigidity by providing through-holes, grooves, reducing thickness, or splicing soft plastic components to achieve better bending and tensile properties. In some possible implementations, the second plate portion has at least one groove or at least one through-hole; or the thickness of the second plate portion is less than that of the first plate portion.

[0034] In some possible implementations, the first section is fixedly connected to the first housing, the second section is not fixed to the main shaft, and the third section is fixedly connected to the support plate. In this case, the flexible display can bend into a desired shape when the electronic device switches from an unfolded state to a closed state, reducing the risk of the flexible display buckling and improving its reliability and service life.

[0035] In some possible implementations, the main shaft includes an outer surface facing away from the flexible display screen; when the first shell and the second shell are relatively unfolded to an open state, the first shell and the second shell are spliced ​​and jointly shield the outer surface of the main shaft; when the first shell and the second shell are relatively folded to a closed state, a portion of the outer surface of the main shaft is exposed relative to the first shell and the second shell, and the two side edges of the outer surface of the main shaft are shielded by the first shell and the second shell.

[0036] In the embodiment of the present application, when the first shell and the second shell are in the open state, the two shells are spliced ​​together and together shield the main shaft, so that there is no obvious broken structure or gap at the connection between the electronic device and the two shells, and the appearance of the electronic device is better. When the first shell and the second shell are in the closed state, the two shells surround the two side edges of the main shaft, and there is no obvious cut structure or gap at the connection between the two shells and the main shaft, and the appearance of the electronic device is better. Therefore, the electronic device has a better appearance integrity in both the open and closed states, and external debris is not easy to enter the inner side of the folding assembly, which is conducive to improving the reliability of the electronic device.

[0037] In some possible implementations, the first shell includes a first end face close to the main shaft, and the second shell includes a second end face close to the main shaft; when the first shell and the second shell are relatively unfolded to an open state, the first end face faces the second end face; when the first shell and the second shell are relatively folded to a closed state, the first end face and the second end face have the same orientation, and in the thickness direction of the main shaft, the distance between the first end face and the outer surface of the main shaft is greater than the distance between the second end face and the outer surface of the main shaft.

[0038] Among them, when the first shell and the second shell are in the open state, the first end face and the second end face can be tilted relative to the thickness direction of the main axis; when the first shell and the second shell are in the closed state, the first end face and the second end face can be flush with each other to improve the appearance experience and grip feel of the electronic device.

[0039] In some possible implementations, the electronic device also includes a third shell and a second folding component, the second folding component is connected to the side of the first shell away from the second shell, and the second folding component is also connected to the third shell. When the electronic device is in a closed state, the first shell is located between the third shell and the second shell; the part corresponding to the flexible display screen and the third shell is fixed to the third shell, and during the process of relative expansion or folding of the first shell and the third shell, the part corresponding to the flexible display screen and the second folding component is deformed; when the electronic device is in an open state, the flexible display screen is located on the same side of the first shell, the second shell and the third shell, and the first shell, the second shell and the third shell jointly support the flexible display screen; when the electronic device is in a closed state, in the direction from the third shell to the second shell, the part corresponding to the flexible display screen and the third shell, the third shell, the first shell, the part corresponding to the flexible display screen and the first shell, the part corresponding to the flexible display screen and the second shell and the second shell are stacked in sequence.

[0040] In the second aspect, an embodiment of the present application also provides a folding component, which is applied to a foldable electronic device, and the folding component is used to connect the first shell and the second shell of the electronic device; the folding component includes a main shaft, a fixed frame, a rotating arm, a first connecting arm and a second connecting arm; the first end of the rotating arm is rotatably connected to the main shaft, and the second end of the rotating arm is fixedly connected to the first shell; the fixed frame is used to fixedly connect to the second shell; the first end of the first connecting arm is rotatably connected to the main shaft around the first axis, and the second end of the first connecting arm is slidably connected to the fixed frame; the first end of the second connecting arm is rotatably connected to the main shaft around the second axis, and the second end of the second connecting arm is slidably connected or rotatably connected to the fixed frame, and the second axis does not coincide with the first axis.

[0041] In an embodiment of the present application, the folding assembly adopts an asymmetric structure, the first shell is rotatably connected to the main shaft through a rotating arm, and the second shell is movably connected to the main shaft through a first connecting arm, a second connecting arm and a fixed frame to achieve relative movement between the first shell and the second shell. The folding assembly has fewer parts, a simpler structure, and a lower cost.

[0042] Furthermore, the connection between the second housing and the main shaft is achieved through the coordination of a dual-link slider mechanism, or the coordination of a link slider mechanism and a connecting rod mechanism. The second housing is capable of relative motion to the main shaft. This reduces the number of components, simplifies the coordination relationship and positioning, and makes the components easy to manufacture and assemble, facilitating mass production and reducing the cost of the folding device. Furthermore, because the main shaft is linked to the fixed frame via the first and second connecting arms, the movement path of the second housing is precise, facilitating accurate control of the folding device's motion configuration. Furthermore, the folding device exhibits superior mechanical tensile and compressive resistance.

[0043] In addition, since the first shell is connected to the main shaft through the rotating arm, after the first shell is rotated to a closed state relative to the main shaft, no concave space for accommodating the flexible display is reserved at the connection between the first shell and the main shaft, and the second shell is connected to the main shaft through the first connecting arm and the second connecting arm, for example, the main shaft is connected through a double-link slider mechanism or a connecting slider mechanism and a connecting rod mechanism cooperation mechanism. After the second shell is rotated to a closed state relative to the main shaft, a concave space for accommodating the flexible display can be reserved at the connection between the second shell and the main shaft. Therefore, when the first shell and the second shell are folded relative to each other to a closed state, a receiving space offset toward the second shell is formed between the first shell and the second shell and on the inner side of the folding assembly. Based on the shape of the receiving space offset to one side, compared with the symmetrical space of traditional folding electronic devices, the bending position of the part of the flexible display accommodated in the receiving space can be reduced, thereby helping to reduce the risk of damage to the flexible display, improve the reliability of the flexible display, and extend the service life of the flexible display.

[0044] In some possible implementations, the folding assembly further includes a synchronization assembly that engages the first end of the rotating arm and the first end of the first connecting arm. In the embodiment of the present application, the synchronization assembly synchronizes the rotation of the rotating arm relative to the main shaft and the rotation of the first connecting arm relative to the main shaft, thereby improving the user's operating experience of the mechanism.

[0045] In some possible implementations, the first end of the rotating arm includes a connecting gear, the synchronization assembly includes a first synchronization gear and a second synchronization gear, the first synchronization gear engages the connecting gear, and in the thickness direction of the main shaft, the first synchronization gear is located on the side of the support surface of the connecting gear facing away from the main shaft, and the second synchronization gear engages the first synchronization gear and the first end of the first connecting arm.

[0046] In the embodiment of the present application, the upper and lower arrangement of the connecting gear and the first synchronous gear can make full use of the thickness space of the main shaft. The first synchronous gear and the connecting gear reuse part of the width space of the main shaft, which is beneficial to reducing the width dimension of the main shaft and realizing miniaturization of the main shaft.

[0047] The pitch circle diameter of the second synchronous gear can be different from that of the first synchronous gear to better match the position of the first synchronous gear and the first end of the first connecting arm, thereby achieving meshing transmission. Furthermore, since the second synchronous gear is a partial gear, the position of its teeth and toothless area can be adjusted to minimize the space required for its movement while ensuring meshing connection. This reduces the space required for the main shaft, such as the space required in the thickness direction of the main shaft, thereby facilitating a thinner main shaft.

[0048] In some possible implementations, the connecting gear is an incomplete gear, comprising a support surface and a tooth portion disposed opposite each other. When the first and second housings are unfolded relative to each other to an open state, the teeth of the connecting gear face the first synchronization gear and are located within the main shaft, with the support surface of the connecting gear flush with the support surface of the main shaft. In this case, the connecting gear can be used together with the main shaft to support the flexible display, thereby increasing the integrity and flatness of the supporting environment for the flexible display. Furthermore, the use of an incomplete gear reduces its own size while satisfying the connection relationship, thereby reducing the thickness of the main shaft on which the connecting gear is mounted, thereby facilitating a thinner main shaft.

[0049] When the first and second housings are folded together to a closed position, the connecting gear rotates relative to the main shaft, and the teeth of the connecting gear partially rotate out of the main shaft. At this time, the connecting gear can move in the space above the main shaft, so that only a portion of the main shaft is reserved for the connecting gear to move, which helps to reduce the thickness of the main shaft and achieve miniaturization of the main shaft.

[0050] In some possible implementations, the rotation center of the first synchronous gear is located farther from the second synchronous gear relative to the rotation center of the connecting gear in the width direction of the main shaft, and the width direction of the main shaft is perpendicular to the thickness direction of the main shaft and perpendicular to the extension direction of the main shaft. In the embodiment of the present application, the position of the rotation center of the first synchronous gear and the rotation center of the connecting gear can ensure that the first synchronous gear and the connecting gear are always in meshing state, preventing idling and improving the mechanical reliability of the folding device.

[0051] In some possible implementations, the first end of the rotating arm further includes an arcuate arm, the arcuate arm being fixed to one side of the connecting gear, with the central axis of the arcuate arm being collinear with the central axis of the connecting gear, and the arcuate arm being mounted in the arcuate slot of the main shaft to rotatably connect to the main shaft. In the embodiment of the present application, the arcuate arm at the first end of the rotating arm cooperates with the arcuate slot of the main shaft to achieve a rotational connection between the first end of the rotating arm and the main shaft via a virtual axis connection.

[0052] In some possible implementations, the rotation center of the first end of the second connecting arm is closer to the flexible display screen than the rotation center of the first end of the first connecting arm. In this case, the position of the rotation center of the first end of the first connecting arm can be adjusted to ensure linkage between the second connecting arm and other structures, and the positions of the rotation centers of the first ends of the second connecting arm and the first end of the first connecting arm can be adjusted to accommodate changes in the position of the fixing frame relative to the main axis.

[0053] In some possible implementations, when the second end of the second connecting arm is slidably connected to the fixed frame, the direction in which the second end of the second connecting arm slides relative to the fixed frame is not parallel to the direction in which the second end of the first connecting arm slides relative to the fixed frame. In an embodiment of the present application, by reasonably designing the sliding directions of the second end of the second connecting arm and the second end of the first connecting arm relative to the fixed frame, the angles of rotation of the first connecting arm and the second connecting arm relative to the main axis can be no greater than 90°. Compared with existing solutions, this can effectively reduce the rotation angle of the second connecting arm, so that the wall thickness of the local structure of the second connecting arm can be larger, and the wall thickness design meets the structural strength requirements, thereby improving the structural reliability of the second connecting arm. In addition, since the rotation angle of the first connecting arm and the second connecting arm is small, it can effectively avoid the need to reduce the thickness of some components in the electronic device due to the need to avoid the rotation of the first connecting arm and the second connecting arm, thereby improving the reliability of the entire structure of the electronic device.

[0054] In some possible implementations, the fixed frame has a first surface, a second surface, a third surface and a fourth surface, the first surface and the second surface are arranged opposite to each other, and the first surface is located between the flexible display screen and the second surface, the third surface and the fourth surface are arranged opposite to each other, and the third surface is located between the main axis and the fourth surface; the fixed frame includes a first slide groove and a second slide groove, the extension direction of the second slide groove is not parallel to the extension direction of the first slide groove, the two end openings of the first slide groove are respectively located on the first surface and the second surface, and the two end openings of the second slide groove are respectively located on the third surface and the fourth surface; the slider at the second end of the first connecting arm is installed in the first slide groove and can slide relative to the fixed frame along the extension direction of the first slide groove; the slider at the second end of the second connecting arm is installed in the second slide groove and can slide relative to the fixed frame along the extension direction of the second slide groove.

[0055] In the embodiment of the present application, by setting the extension direction of the first slide groove and the second slide groove of the fixing frame, the sliding direction of the second end of the first connecting arm relative to the fixing frame and the sliding direction of the second end of the second connecting arm relative to the fixing frame are controlled, which is conducive to controlling the movement path of the fixing frame relative to the main axis, so that the electronic equipment obtains a more ideal accommodation space.

[0056] In some possible implementations, the folding assembly further includes a connecting rod, one end of which is rotatably connected to the first connecting arm, and the other end of which is rotatably connected to the second connecting arm. In this way, the first connecting arm, the connecting rod, the second connecting arm, and the main shaft can form a four-bar linkage, thereby preventing the first and second connecting arms from jamming during relative rotation of the first and second housings, thereby improving the reliability of the mechanism.

[0057] In some possible implementations, the folding assembly further includes a support plate connected to the fixing frame, and further connected to the first connecting arm or the second connecting arm; when the first shell and the second shell are relatively unfolded to an open state, the first shell, the main shaft, the support plate, and the second shell are used to jointly support the flexible display screen of the electronic device; the support plate includes a first end close to the main shaft and a second end away from the main shaft; when the first shell and the second shell are relatively folded to a closed state, the distance between the first end of the support plate and the first shell is greater than the distance between the second end of the support plate and the first shell, so as to form a receiving space between the support plate and the first shell, and the flexible display screen of the electronic device is at least partially received in the receiving space. The receiving space is a space that is narrow at the top and wide at the bottom and is biased toward the second shell.

[0058] In the embodiment of the present application, since the support plate is rotatably connected to the fixed frame and slidably connected to the second connecting arm, during the relative movement of the first shell and the second shell, the support plate moves under the drive of the fixed frame and the second connecting arm, and the movement path is accurate to meet the support requirements of the folding device for the flexible display screen in different forms.

[0059] In addition, since the receiving space is offset toward the second shell, the flexible display screen deforms along with the receiving space, and the part of the flexible display screen received in the receiving space is biased toward the second shell. Compared with the symmetrical deformation of the traditional flexible display screen, the flexible display screen of the present application has fewer bending positions, which is beneficial to reduce the risk of damage to the flexible display screen, improve the reliability of the flexible display screen, and extend the service life of the flexible display screen.

[0060] In some possible implementations, the mounting frame has a first surface that faces the support plate. When the first housing and the second housing are relatively unfolded to an open state, a first angle is formed between the first surface and the support plate, and the distance between the end of the first surface closer to the main axis and the support plate is greater than the distance between the end of the first surface farther from the main axis and the support plate. When the first housing and the second housing are relatively folded to a closed state, the support plate rotates relative to the mounting frame and approaches the first surface, forming a second angle between the first surface and the support plate, the second angle being smaller than the first angle. That is, during the closing process of the electronic device, the support plate rotates relative to the mounting frame, and by approaching the mounting frame, a receiving space is formed.

[0061] In some possible implementations, the fixing frame further has a first rotation groove, which is an arc-shaped groove and extends from the first surface to the inside of the fixing frame; the support plate includes a plate body and a first rotating block, the plate body is used to support the flexible display screen when the first shell and the second shell are relatively unfolded to an open state, the first rotating block is fixed to the side of the plate body facing away from the flexible display screen, and the arc-shaped arm of the first rotating block extends from the plate body in a direction away from the main axis; the arc-shaped arm of the first rotating block is installed in the first rotation groove, and during the relative unfolding of the first shell and the second shell, a part of the arc-shaped arm of the first rotating block rotates out of the first rotation groove, and during the relative folding of the first shell and the second shell, a part of the arc-shaped arm of the first rotating block rotates into the first rotation groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] FIG1 is a schematic structural diagram of an electronic device in an open state provided by an embodiment of the present application;

[0063] FIG2 is a schematic structural diagram of the electronic device shown in FIG1 in a closed state;

[0064] FIG3 is a schematic diagram of a partially exploded structure of the electronic device shown in FIG1 ;

[0065] FIG4 is a schematic diagram of a partially exploded structure of the folding device shown in FIG3 ;

[0066] FIG5 is a schematic diagram of a partially exploded structure of the folding assembly shown in FIG4 ;

[0067] FIG6 is a schematic diagram of the exploded structure of the main shaft shown in FIG5 ;

[0068] FIG7 is a schematic diagram of a partial structure of the main shaft shown in FIG5;

[0069] FIG8A is a schematic diagram of a cross-sectional structure of the main shaft shown in FIG7 taken along AA;

[0070] FIG8B is a schematic diagram of the cross-sectional structure of the main shaft shown in FIG7 taken along line BB;

[0071] FIG8C is a schematic diagram of the cross-sectional structure of the main shaft shown in FIG7 taken along CC;

[0072] FIG8D is a schematic diagram of the cross-sectional structure of the main shaft shown in FIG7 taken along DD;

[0073] FIG9 is a schematic structural diagram of the bottom connection assembly shown in FIG5 ;

[0074] FIG10 is a schematic diagram of a partially exploded structure of the bottom connection assembly shown in FIG9 ;

[0075] FIG11A is a schematic structural diagram of the rotating arm shown in FIG10;

[0076] FIG11B is a schematic structural diagram of the rotating arm shown in FIG11A at another angle;

[0077] FIG12 is a schematic structural diagram of the first connecting arm shown in FIG10;

[0078] FIG13A is a schematic structural diagram of the synchronization component shown in FIG10;

[0079] FIG13B is a schematic structural diagram of the synchronization assembly shown in FIG13A at another angle;

[0080] FIG14 is a schematic structural diagram of the damping assembly shown in FIG10;

[0081] FIG15 is a schematic diagram of the exploded structure of the damping assembly shown in FIG14;

[0082] FIG16 is a schematic diagram of a portion of the structure of the bottom connection assembly shown in FIG9;

[0083] FIG17 is a schematic structural diagram of the second connecting arm shown in FIG10;

[0084] FIG18 is a schematic diagram of the assembly structure of the main shaft shown in FIG7 and a partial structure of the bottom connection assembly shown in FIG9;

[0085] FIG19 is a schematic diagram of a portion of the structure shown in FIG18 ;

[0086] FIG20 is a schematic structural diagram of the fixing frame shown in FIG10;

[0087] FIG21 is a schematic diagram of a portion of the structure of the folding device shown in FIG3;

[0088] FIG22A is a schematic cross-sectional view of the structure shown in FIG21 taken along line EE;

[0089] FIG22B is a schematic cross-sectional view of the structure shown in FIG22A in another use state;

[0090] FIG23A is a schematic cross-sectional view of the structure shown in FIG21 taken along line FF;

[0091] FIG23B is a schematic cross-sectional view of the structure shown in FIG23A in another use state;

[0092] FIG24A is a schematic cross-sectional view of the structure shown in FIG21 taken along GG;

[0093] FIG24B is a schematic cross-sectional view of the structure shown in FIG24A in another use state;

[0094] FIG25 is a schematic diagram of the mechanism when the first connecting arm, the second connecting arm and the fixing frame shown in FIG21 move relative to each other;

[0095] FIG26 is a schematic diagram showing the positional relationship among the first housing, the second housing, and the main shaft shown in FIG21 ;

[0096] FIG27 is a schematic structural diagram of the support plate shown in FIG5 at another angle;

[0097] FIG28 is a schematic structural diagram of the folding device shown in FIG3 at another angle;

[0098] FIG29A is a schematic cross-sectional view of the folding device shown in FIG28 taken along line HH;

[0099] FIG29B is a schematic cross-sectional view of the structure shown in FIG29A in another use state;

[0100] FIG30A is a schematic cross-sectional view of the folding device shown in FIG28 taken along line II;

[0101] FIG30B is a schematic cross-sectional view of the structure shown in FIG30A in another use state;

[0102] FIG31A is a schematic diagram of the internal structure of the electronic device shown in FIG2 ;

[0103] FIG31B is a schematic structural diagram of a fixing solution of the flexible display screen and the folding device of the electronic device shown in FIG1 in some embodiments;

[0104] FIG32 is a schematic diagram of the exploded structure of the flexible display screen shown in FIG31B ;

[0105] FIG33 is a schematic diagram of the structure of a portion of the folding assembly shown in FIG4 in other embodiments;

[0106] FIG34A is a schematic diagram of a motion mechanism of a partial structure of the folding assembly shown in FIG4 in other embodiments;

[0107] FIG34B is a schematic structural diagram of a portion of the motion mechanism shown in FIG34A in some implementations;

[0108] FIG34C is a schematic diagram of a partial structure of the motion mechanism shown in FIG34A in other implementations;

[0109] Figure 35 is a schematic structural diagram of the electronic device provided in some other embodiments of the embodiment of the present application. DETAILED DESCRIPTION

[0110] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0111] In the description of the embodiments of the present application, unless otherwise expressly specified and limited, "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist at the same time, and B exists alone. The terms "first" and "second" are used for descriptive purposes only and cannot be understood as implying or suggesting the relative importance or the number of implicitly specified technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. "Multiple" refers to two or more than two.

[0112] "Installation" and "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" means that the two are connected to each other and the relative position relationship remains unchanged after the connection. "Rotational connection" means that the two are connected to each other and can rotate relative to each other after the connection. "Sliding connection" means that the two are connected to each other and can slide relative to each other after the connection. Among them, "integrally formed structural parts" means that in the process of forming one part of the structural part, the part is connected to the other parts of the structural part, and does not need to be connected to other parts through reprocessing (such as bonding, welding, clamping, etc.).

[0113] The directional terms mentioned in the embodiments of the present application, such as "up", "down", "left", "right", "inside", "outside", etc., are only references to the directions in the drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0114] Please refer to Figures 1 to 3 in conjunction with each other. Figure 1 is a schematic diagram of the structure of an electronic device 100 provided in an embodiment of the present application when it is in an open state. Figure 2 is a schematic diagram of the structure of the electronic device 100 shown in Figure 1 when it is in a closed state. Figure 3 is a schematic diagram of the partially exploded structure of the electronic device 100 shown in Figure 1. Among them, the electronic device 100 can be a foldable electronic product such as a mobile phone, tablet computer, laptop computer, wearable device, etc. The wearable device can be a smart watch, smart bracelet, etc. The embodiment of the present application is described by taking the electronic device 100 as an example of a mobile phone.

[0115] In some embodiments, the electronic device 100 may include a folding device 10 and a flexible display 20, with the flexible display 20 mounted on the folding device 10. The flexible display 20 is configured to display images. For example, the folding device 10 may include a first housing 1, a second housing 2, and a folding assembly 3. The folding assembly 3 connects the first housing 1 and the second housing 2. Movement of the folding assembly 3 allows the first housing 1 and the second housing 2 to be relatively unfolded to an open state or folded to a closed state.

[0116] As shown in Figure 1, the first housing 1 and the second housing 2 can be relatively unfolded to an open state, so that the folding assembly 3, the folding device 10, and the electronic device 100 are all in the open state, and the flexible display 20 is unfolded along with the folding device 10. For example, when the folding device 10 is in the open state, the angle between the first housing 1 and the second housing 2 is 120°, 150°, 165°, 180°, etc. The embodiment of the present application is described using the angle between the first housing 1 and the second housing 2 as an example, in which case the flexible display 20 is in a flattened state.

[0117] As shown in Figure 2, the first housing 1 and the second housing 2 can be folded relative to each other into a closed state, so that the folding assembly 3, the folding device 10, and the electronic device 100 are all in a closed state, and the flexible display 20 folds along with the folding device 10. For example, when the folding device 10 is in the closed state, the flexible display 20 can be located between the first housing 1 and the second housing 2, that is, the flexible display 20 can be located inside the folding device 10 and wrapped by the folding device 10. It is understood that when the first housing 1 and the second housing 2 are in the closed state, the angle between the first housing 1 and the second housing 2 can be approximately 0°.

[0118] The first housing 1 and the second housing 2 can also be relatively unfolded or folded to an intermediate state, so that the folding assembly 3, the folding device 10, and the electronic device 100 are all in an intermediate state. The intermediate state can be any state between the open state and the closed state, and the flexible display 20 will also change accordingly.

[0119] In this embodiment, the flexible display screen 20 can be unfolded or folded along with the folding device 10. When the electronic device 100 is in the open state, the flexible display screen 20 is in a flat state, capable of full-screen display, thus providing the electronic device 100 with a larger display area and improving the user's viewing and operating experience. When the electronic device 100 is in the closed state, the planar size of the electronic device 100 is small, making it easy for the user to carry and store. When the electronic device 100 is in an intermediate state, the flexible display screen 20 is in a bent state, which can meet the user's viewing needs from different viewing angles.

[0120] In some embodiments, the first shell 1 includes a first supporting surface 11 for supporting the flexible display screen 20, and the second shell 2 includes a second supporting surface 21 for supporting the flexible display screen 20. It should be noted that in the present application, the angle between the first supporting surface 11 and the second supporting surface 21 is the angle between the first shell 1 and the second shell 2. When the electronic device 100 is in the open state, the angle between the first supporting surface 11 and the second supporting surface 21 can be 180°. In the embodiments of the present application, the specific shapes of the first supporting surface 11 and the second supporting surface 21 are not strictly limited. For example, the first supporting surface 11 can be provided with one or more notches, recesses, protrusions and other structures, and the second supporting surface 21 can be provided with one or more notches, recesses, protrusions and other structures.

[0121] In some embodiments, the flexible display screen 20 may also integrate a display function and a touch sensing function. The display function of the flexible display screen 20 is used to display text, images, videos, etc., and the touch sensing function of the flexible display screen 20 is used to detect the user's touch action to realize information interaction between humans and machines. Among them, the flexible display screen 20 can be a liquid crystal display (LCD), an organic light-emitting diode (OLED) display screen, an active-matrix organic light-emitting diode or active-matrix organic light-emitting diode (AMOLED) display screen, a mini organic light-emitting diode (MIL-OLED) display screen, a micro organic light-emitting diode (MIL-LED) display screen, a micro organic light-emitting diode (MIL-LED) display screen, or a quantum dot light-emitting diode (QLED) display screen, etc.

[0122] In this embodiment, as shown in Figures 1 and 3, the flexible display 20 may include a first portion 201, a second portion 202, and a third portion 203. The third portion 203 is connected between the first portion 201 and the second portion 202. Specifically, the first portion 201, the third portion 203, and the second portion 202 are arranged in sequence. The portion of the flexible display 20 corresponding to the first housing 1 is the first portion 201, which can be fixed to the first housing 1; the portion of the flexible display 20 corresponding to the second housing 2 is the second portion 202, which can be fixed to the second housing 2; and the portion of the flexible display 20 corresponding to the folding assembly 3 is the third portion 203. During relative expansion or folding of the first and second housings 1 and 2, the first housing 1 drives the first portion 201 to move, and the second housing 2 drives the second portion 202 to move. The third portion 203 deforms under the influence of the first and second portions 201, 202, and the folding mechanism 10. When the flexible display 20 is flattened, the first portion 201, third portion 203, and second portion 202 are all located in the same plane. When the flexible display 20 is closed, the first portion 201 and second portion 202 are positioned opposite each other, partially or fully abutting each other, or with a small gap between them. The third portion 203 is bent.

[0123] In some embodiments, the electronic device 100 may further include multiple components (not shown in the figure), and the multiple components are mainly housed inside the first shell 1 and the second shell 2, and some components may also be at least partially installed in the folding assembly 3. The embodiment of the present application does not strictly limit this. The multiple components of the electronic device 100 may include but are not limited to a processor, an internal processor, an external storage interface, a universal serial bus (USB) interface, a charging management module, a power management module, a battery, an antenna, a communication module, a camera module, an audio module, a speaker, a receiver, a microphone, a headphone interface, a sensor module, a subscriber identification module (SIM) card interface, one or more rigid circuit boards or flexible circuit boards, etc. Among them, the electronic device 100 may have more or fewer components than described above, may combine two or more components, or may have different component configurations. The embodiment of the present application does not specifically limit the number, type, position, etc. of the modules of the electronic device 100.

[0124] Please refer to Figures 4 to 6. Figure 4 is a partially exploded structural diagram of the folding device 10 shown in Figure 3, Figure 5 is a partially exploded structural diagram of the folding assembly 3 shown in Figure 4, and Figure 6 is a partially exploded structural diagram of the main shaft 31 shown in Figure 5.

[0125] In some embodiments, the folding assembly 3 includes a main shaft 31, multiple connecting assemblies (32, 33, 34) and a support plate 35. Exemplarily, the multiple connecting assemblies (32, 33, 34) are all connected to the main shaft 31, and the multiple connecting assemblies (32, 33, 34) are all able to move and expand or fold relative to the main shaft 31. The multiple connecting assemblies (32, 33, 34) are also connected between the first shell 1 and the second shell 2. When the multiple connecting assemblies (32, 33, 34) move relative to the main shaft 31, the first shell 1 and the second shell 2 move relative to the main shaft 31 to expand or fold relative to each other. Exemplarily, the multiple connecting assemblies (32, 33, 34) may include a bottom connecting assembly 32, a middle connecting assembly 33 and a top connecting assembly 34. The top connecting assembly 34, the middle connecting assembly 33 and the bottom connecting assembly 32 are arranged at intervals in the extension direction of the main shaft 31. The extension direction of the main shaft 31 refers to the direction from its top to its bottom.

[0126] In this embodiment, the coordinated movement of the top connecting assembly 34 , the middle connecting assembly 33 and the bottom connecting assembly 32 makes the movement of the first shell 1 and the second shell 2 relative to the main shaft 31 smoother and more reliable.

[0127] The top connecting assembly 34 and the bottom connecting assembly 32 can have the same structure, mirror-symmetrical structures, or other different structures. The present embodiment of the application uses the mirror-symmetrical structure of the top connecting assembly 34 and the bottom connecting assembly 32 as an example for description, and the following description focuses on the bottom connecting assembly 32. The structure of the middle connecting assembly 33 can be the same, partially the same, or completely different from that of the bottom connecting assembly 32, and this embodiment of the application is not strictly limited to this. In other embodiments, the folding assembly 3 can also be provided with no middle connecting assembly 33, or with multiple middle connecting assemblies 33, and this embodiment of the application is not strictly limited to this.

[0128] Exemplarily, the main shaft 31 includes a main outer shaft 311, a main inner shaft 312, and a plurality of fasteners 313. The main inner shaft 312 is located above the main outer shaft 311, and the plurality of fasteners 313 are used to fix the main inner shaft 312 and the main outer shaft 311. The main inner shaft 312 and the main outer shaft 311 can cooperate to form a plurality of spaces, and the plurality of spaces are used to install a plurality of connecting components (32, 33, 34) and provide a movable space for the plurality of connecting components (32, 33, 34). Among them, the main outer shaft 311 is provided with a plurality of fastening holes 3111, and the plurality of fastening holes 3111 are arranged at the top, middle and bottom of the main outer shaft 311; the main inner shaft 312 is provided with a plurality of fastening holes 3121, and the plurality of fastening holes 3121 of the main inner shaft 312 are arranged in a one-to-one correspondence with the plurality of fastening holes 3111 of the main outer shaft 311; the fasteners 313 pass through the fastening holes 3121 of the main inner shaft 312 and extend into the corresponding fastening holes 3111 of the main outer shaft 311 to realize the fastening of the main inner shaft 312 and the main outer shaft 311.

[0129] Illustratively, the support plate 35 is located on the side of the main inner shaft 312 facing the second housing 2. The support plate 35 connects the top connecting assembly 34, the middle connecting assembly 33, and the bottom connecting assembly 32, so as to move along with the top connecting assembly 34, the middle connecting assembly 33, and the bottom connecting assembly 32 during the movement of the folding assembly 3. When the electronic device 100 is in the open state, the main shaft 31 and the support plate 35 can jointly support the third portion 203 of the flexible display 20, thereby improving the reliability of the third portion 203 of the flexible display 20.

[0130] Among them, the main shaft 31 has a support surface 314, and the support surface 314 of the main shaft 31 can be located on the side of the main inner shaft 312 facing away from the main outer shaft 311. The support plate 35 is provided with a support surface 351, and the support surface 351 of the support plate 35 is arranged away from the multiple connecting components (32, 33, 34). When the electronic device 100 is in the open state, the support surface 314 of the main shaft 31 can be spliced ​​with the support surface 351 of the support plate 35, and set toward the flexible display screen 20, for jointly providing a flat support environment for the third part 203 of the flexible display screen 20, so as to improve the reliability of the flexible display screen 20. It can be understood that in the embodiment of the present application, when two surfaces are spliced, a solution in which the two surfaces are connected can be included, and a solution in which there is a small gap between the two surfaces but the overall splicing effect is presented can also be included.

[0131] As shown in Figures 3 and 4 , the first housing 1 may further include a third support surface 12, which is located on a side of the first support surface 11 that is closer to the folding assembly 3. The third support surface 12 and the first support surface 11 may be coplanar. The plurality of connecting components (32, 33, 34) of the folding assembly 3 may be partially embedded in the third support surface 12. When the electronic device 100 is in the open state, the third support surface 12 of the first housing 1 can work together with the main shaft 31 and the support plate 35 to support the third portion 203 of the flexible display 20, thereby improving the reliability of the third portion 203 of the flexible display 20.

[0132] Please refer to Figures 6 to 8D in combination. Figure 7 is a schematic diagram of a partial structure of the main shaft 31 shown in Figure 5, Figure 8A is a schematic diagram of the cross-sectional structure of the main shaft 31 shown in Figure 7 taken along AA, Figure 8B is a schematic diagram of the cross-sectional structure of the main shaft 31 shown in Figure 7 taken along BB, Figure 8C is a schematic diagram of the cross-sectional structure of the main shaft 31 shown in Figure 7 taken along CC, and Figure 8D is a schematic diagram of the cross-sectional structure of the main shaft 31 shown in Figure 7 taken along DD.

[0133] In some embodiments, the main shaft 31 has a first arcuate groove 315. The first arcuate groove 315 can be formed by the opposing arcuate surfaces of the main inner shaft 312 and the main outer shaft 311. Both sides of the first arcuate groove 315 can extend to the support surface 314 of the main shaft 31, with the partial notch in the support surface 314 of the main shaft 31 forming part of the first arcuate groove 315. In this case, the first arcuate groove 315 can be arranged to maximize the space of the main shaft 31, which helps improve the space utilization of the main shaft 31 and reduce the thickness of the main shaft 31. The thickness of the main shaft 31 refers to the dimension of the main shaft 31 in the thickness direction, which is perpendicular to the support surface 314 and the extension direction of the main shaft 31. The main shaft 31 can also have a first notch 316 located on one side of the main shaft 31. The first notch 316 connects the first arcuate groove 315 to the exterior of the main shaft 31. The first notch 316 may be formed on the main inner shaft 312 and / or the main outer shaft 311 .

[0134] In some embodiments, the main shaft 31 may also have a mounting groove 317, which is located on the main inner shaft 312. The mounting groove 317 includes a first part 3171 and a second part 3172 connected to the first part 3171. The first part 3171 of the mounting groove 317 and the second part 3172 of the mounting groove 317 are arranged in the extension direction of the main shaft 31, and the first part 3171 of the mounting groove 317 is located between the first arc groove 315 and the second part 3172 of the mounting groove 317. The first part 3171 of the mounting groove 317 is connected to the first arc groove 315.

[0135] The main inner shaft 312 includes a first curved surface 3122 and a second curved surface 3123. The first curved surface 3122 forms the groove wall or a portion of the groove wall of the first portion 3171 of the mounting groove 317. The first curved surface 3122 is disposed toward the support surface 314 of the main shaft 31. The second curved surface 3123 forms a portion of the groove wall of the second portion 3172 of the mounting groove 317. The second curved surface 3123 is disposed away from the support surface 314 of the main shaft 31. The central axis of the second curved surface 3123 is collinear with the central axis of the first curved surface 3122. The arrangement of the second curved surface 3123 and the first curved surface 3122 enables the mounting groove 317 to include an equivalent arcuate groove, the central axis of which is collinear with the central axis of the first arcuate groove 315.

[0136] In some embodiments, the main shaft 31 may further include an installation space 318, which may be formed by the main inner shaft 312 and the main outer shaft 311. The installation space 318 is generally located on the side of the installation slot 317 facing away from the support surface 314 of the main shaft 311, and is connected to the installation slot 317. The bottom of the second portion 3172 of the installation slot 317 is open, allowing the installation space 318 to connect to the second portion 3172 of the installation slot 317. The first curved surface 3122 may be provided with a notch, allowing the bottom of the first portion 3171 of the installation slot 317 to open, allowing the installation space 318 to connect to the first portion 3171 of the installation slot 317. The length of the installation space 318 extends parallel to the extension direction of the main shaft 31. The main shaft 31 may further include a second notch 319, located on the side of the main shaft 31 away from the first notch 316, connecting the installation space 318 to the exterior of the main shaft 31. The second notch 319 may be formed on the main inner shaft 312 and / or the main outer shaft 311 .

[0137] Illustratively, the main shaft 31 further has positioning grooves 3110, at least one of which communicates with the installation space 318. The positioning grooves 3110 are formed by the main inner shaft 312 and the main outer shaft 311. There can be one or more positioning grooves 3110. When there are multiple positioning grooves 3110, the multiple positioning grooves 3110 are spaced apart from each other. For example, there can be two positioning grooves 3110, and the two positioning grooves 3110 can be arranged at opposite ends of the installation space 318.

[0138] In some embodiments, the main shaft 31 may further include a second arcuate groove 3120. The second arcuate groove 3120 may be formed by the arcuate surface on the main inner shaft 312 and the arcuate surface on the main outer shaft 311 being arranged opposite each other. Both sides of the second arcuate groove 3120 may extend to the support surface 314 of the main shaft 31, and the partial notch on the support surface 314 of the main shaft 31 constitutes a portion of the second arcuate groove 3120. In this case, the first arcuate groove 315 can be arranged to maximize the space utilization of the main shaft 31, which is conducive to improving the space utilization rate of the main shaft 31 and reducing the thickness of the main shaft 31. The main inner shaft 312 also has a third notch 3130. The third notch 3130 extends through the side of the main inner shaft 312 away from the first notch 316. The third notch 3130 connects the second arcuate groove 3120 to the external space of the main shaft 31.

[0139] Please refer to FIG. 9 and FIG. 10 . FIG. 9 is a schematic structural diagram of the bottom connection assembly 32 shown in FIG. 5 , and FIG. 10 is a partially exploded structural diagram of the bottom connection assembly 32 shown in FIG. 9 .

[0140] In some embodiments, the bottom connection assembly 32 includes a rotating arm 321 , a fixing frame 322 , a first connection arm 323 , a second connection arm 324 , a connecting rod 325 , a connecting shaft 326 , a synchronization assembly 327 , a damping assembly 328 , a first set of connecting parts 3291 and a second set of connecting parts 3292 .

[0141] The pivot arm 321 can be connected to the first housing 1 via a first set of connecting members 3291, which can include one or more fasteners. The fixed frame 322 can be connected to the second housing 2 via a second set of connecting members 3292, which can include one or more fasteners. The first connecting arm 323 and the second connecting arm 324 are both connected to the fixed frame 322. The connecting rod 325 can connect the first connecting arm 323 and the second connecting arm 324 via a connecting shaft 326. The synchronizing assembly 327 connects the pivot arm 321 and the first connecting arm 323. The damping assembly 328 also connects the pivot arm 321 and the first connecting arm 323.

[0142] Please refer to FIG. 11A and FIG. 11B . FIG. 11A is a schematic structural diagram of the rotating arm 321 shown in FIG. 10 , and FIG. 11B is a schematic structural diagram of the rotating arm 321 shown in FIG. 11A at another angle.

[0143] In some embodiments, the rotating arm 321 includes a first end 3211 and a second end 3212 connected to the first end 3211. The first end 3211 of the rotating arm 321 may include a connecting gear 321a, a connecting rod 321b, and an arcuate arm 321c. The connecting gear 321a may be an incomplete gear. The connecting gear 321a includes a shaft 321d and a tooth portion 321e. The shaft 321d of the connecting gear 321a may be an incomplete shaft. The shaft 321d of the connecting gear 321a has a support surface 321f. The tooth portion 321e of the connecting gear 321a may be an incomplete tooth portion. The tooth portion 321e of the connecting gear 321a is disposed opposite the support surface 321f of the connecting gear 321a and is disposed around the shaft 321d. The shaft portion 321d of the connecting gear 321a further includes a first arcuate surface 321g. Both sides of the first arcuate surface 321g are connected to the support surface 321f of the connecting gear 321a. The center of the first arcuate surface 321g is recessed relative to the support surface 321f of the connecting gear 321a toward the tooth portion 321e of the connecting gear 321a. The central axis (not shown) of the first arcuate surface 321g is collinear with the central axis (not shown) of the connecting gear 321a.

[0144] Exemplarily, one end of the connecting rod 321b is fixed to the connecting gear 321a, and the other end of the connecting rod 321b is fixed to the arcuate arm 321c. The connecting rod 321b has a support surface 321h and a second arcuate surface 321i. The support surface 321h of the connecting rod 321b and the support surface 321f of the connecting gear 321a can be arranged in the same plane. The second arcuate surface 321i of the connecting rod 321b is arranged to face away from the support surface 321h of the connecting rod 321b, and the central axis of the second arcuate surface 321i is collinear with the central axis of the first arcuate surface 321g. At this time, the second arcuate surface 321i of the connecting rod 321b cooperates with the first arcuate surface 321g of the connecting gear 321a to form an equivalent arcuate arm. Wherein, the central axis of the arcuate arm (not shown in the figure) is collinear with the central axis of the connecting gear 321a (not shown in the figure).

[0145] The end surfaces of both sides of the arc-shaped arm 321c can be coplanarly arranged to form a support surface 321j of the arc-shaped arm 321c, and the support surface 321j of the arc-shaped arm 321c can be coplanarly arranged with the support surface 321h of the connecting rod 321b.

[0146] In some embodiments, the second end 3212 of the pivoting arm 321 can be generally plate-shaped. The second end 3212 of the pivoting arm 321 has a support surface 321k, which can be coplanar with the support surface 321j of the arc-shaped arm 321c. The second end 3212 of the pivoting arm 321 can be provided with a plurality of connection holes 321m, which can be spaced apart. The plurality of connection holes 321m are used to connect the second end 3212 of the pivoting arm 321 to other structures.

[0147] The rotating arm 321 can be an integrally formed structural member to provide high structural strength. For example, the rotating arm 321 can be formed using a computer numerical control (CNC) milling process. In other embodiments, the rotating arm 321 can also be formed using a metal injection molding process, which is not strictly limited in this embodiment of the present application.

[0148] Please refer to FIG. 12 , which is a schematic structural diagram of the first connecting arm 323 shown in FIG. 10 .

[0149] In some embodiments, the first connecting arm 323 includes a first end 3231 and a second end 3232. For example, the first end 3231 of the first connecting arm 323 may be provided with a rotation shaft hole 323a, which extends through the first end 3231 of the first connecting arm 323. The first end 3231 of the first connecting arm 323 also includes a plurality of meshing teeth 323b and a plurality of protrusions 323c. The plurality of meshing teeth 323b may be located in the middle of the first end 3231 of the first connecting arm 323, and approximately on the side of the first end 3231 of the first connecting arm 323 that faces away from the second end 3232 of the first connecting arm 323. The plurality of meshing teeth 323b together form a tooth portion, such that the first end 3231 of the first connecting arm 323 constitutes an incomplete gear. Multiple protrusions 323c can be located on one side of the first end 3231 of the first connecting arm 323, and the multiple protrusions 323c are arranged at intervals from each other. The multiple protrusions 323c are arranged around the shaft hole 323a of the first end 3231 of the first connecting arm 323, and the multiple protrusions 323c form a cam surface.

[0150] Exemplarily, the second end 3232 of the first connecting arm 323 may include a slider 323d, a connecting block 323e, and an insertion shaft 323f. The connecting block 323e and the slider 323d are in a relatively fixed relationship, their movement paths are consistent, and their arrangement directions may be parallel to the axial direction of the rotating shaft hole 323a of the first end 3231 of the first connecting arm 323. The connecting block 323e may be spaced apart from the slider 323d, or, in some other embodiments, the connecting block 323e may also be connected to the slider 323d. The insertion shaft 323f may be fixed to the side of the connecting block 323e facing away from the slider 323d, and the extension direction of the insertion shaft 323f is parallel to the axial direction of the rotating shaft hole 323a of the first end 3231 of the first connecting arm 323.

[0151] Exemplarily, the first connecting arm 323 also includes a connecting section 3233 connected between the first end 3231 and the second end 3232. The provision of the connecting section 3233 of the first connecting arm 323 makes the structural design of the first connecting arm 323 more flexible and can better meet connection requirements and shape requirements. Specifically, the connecting section 3233 of the first connecting arm 323 can be roughly bar-shaped. The connecting section 3233 can extend axially along the rotating shaft hole 323a of the first end 3231 of the first connecting arm 323. The slider 323d is fixed to the connecting section 3233, and the connecting block 323e is fixed to the connecting section 3233. Therefore, the connecting block 323e can be fixed relative to the slider 323d via the connecting section 3233. In other embodiments, the connecting section 3233, the slider 323d, and the connecting block 323e of the first connecting arm 323 can also have other positional relationships or connection relationships, which are not strictly limited in the embodiments of the present application.

[0152] The first connecting arm 323 can be an integrally formed structural member to provide greater structural strength. For example, the first connecting arm 323 can be formed using a computer numerical control milling process. In other embodiments, the first connecting arm 323 can also be formed using a metal injection molding process, which is not strictly limited in this embodiment of the present application.

[0153] Please refer to FIG. 13A and FIG. 13B . FIG. 13A is a schematic structural diagram of the synchronization component 327 shown in FIG. 10 , and FIG. 13B is a schematic structural diagram of the synchronization component 327 shown in FIG. 13A at another angle.

[0154] In some embodiments, the synchronization assembly 327 may include multiple synchronization gears. For example, the synchronization assembly 327 may include a first synchronization gear 3271 and a second synchronization gear 3272. The first synchronization gear 3271 may include a shaft portion 3271a and a tooth portion 3271b. The shaft portion 3271a of the first synchronization gear 3271 is provided with a rotation shaft hole 3271c. One end surface of the shaft portion 3271a may be flat, and the other end surface of the shaft portion 3271a may be a cam surface 3271d. The tooth portion 3271b of the first synchronization gear 3271 is circumferentially fixed to the circumference of the shaft portion 3271a and includes a plurality of meshing teeth. The first synchronization gear 3271 may be a complete gear, and the tooth portion 3271b of the first synchronization gear 3271 is a complete tooth portion.

[0155] The second synchronous gear 3272 may include a shaft portion 3272a and a tooth portion 3272b. The shaft portion 3272a of the second synchronous gear 3272 has a rotating shaft hole 3272c. One end surface of the shaft portion 3272a may be flat, and the other end surface of the shaft portion 3272a may be a cam surface 3272d. The tooth portion 3272b of the second synchronous gear 3272 is circumferentially fixed to the shaft portion 3272a and includes a plurality of meshing teeth. Among them, the second synchronous gear 3272 can be an incomplete gear, and the tooth portion 3272b of the second synchronous gear 3272 can be an incomplete tooth portion. For example, the tooth portion 3272b can include a first tooth portion 3272e and a second tooth portion 3272f. The first tooth portion 3272e and the second tooth portion 3272f are arranged at intervals from each other. A first toothless area 3272g is formed between one side of the first tooth portion 3272e and one side of the second tooth portion 3272f, and a second toothless area 3272h is formed between the other side of the first tooth portion 3272e and the other side of the second tooth portion 3272f. In this embodiment of the application, an incomplete gear refers to a gear that includes a tooth area and a toothless area in the circumferential direction of the gear. For example, as shown in Figure 12, in the circumferential direction of the meshing teeth 323b, the area where the meshing teeth 323b exist is the tooth area, and the area where the meshing teeth 323b do not exist is the toothless area. For example, as shown in Figure 11B, the connecting gear 321a is also an incomplete gear. In the circumferential direction of the meshing teeth 321e, the area where the meshing teeth 321e exist is the tooth area, and the area where the meshing teeth 321e do not exist, such as the support surface 321f area, is the toothless area.

[0156] The pitch circle diameter of the second synchronous gear 3272 may be the same as or different from the pitch circle diameter of the first synchronous gear 3271. For example, the pitch circle diameter of the second synchronous gear 3272 is larger than the pitch circle diameter of the first synchronous gear 3271.

[0157] Please refer to FIG. 14 and FIG. 15 . FIG. 14 is a schematic structural diagram of the damping assembly 328 shown in FIG. 10 , and FIG. 15 is a schematic exploded structural diagram of the damping assembly 328 shown in FIG. 14 .

[0158] In some embodiments, the damping assembly 328 includes a locking member 3281 , a first fixing member 3282 , an elastic member 3283 , a second fixing member 3284 , a limiting member 3285 , a first rotating shaft 3286 , a second rotating shaft 3287 and a third rotating shaft 3288 .

[0159] Illustratively, the retaining member 3281 has three first through holes 3281a spaced apart from one another. The retaining member 3281 includes three bump groups 3281b located on the same side of the retaining member 3281, corresponding one-to-one to the three first through holes 3281a. Each bump group 3281b includes a plurality of bumps spaced apart and arranged around the corresponding first through hole 3281a, forming a cam surface 3281c on one side of the first through hole 3281a.

[0160] For example, the first fixing member 3282 is located on one side of the locking member 3281. The first fixing member 3282 may be substantially plate-shaped and have three second through holes 3282a, which are spaced apart from each other.

[0161] For example, the second fixing member 3284 is located on a side of the locking member 3281 away from the first fixing member 3282. The second fixing member 3284 may be substantially plate-shaped and have three third through holes 3284a spaced apart from each other.

[0162] Illustratively, the limiting member 3285 is located on a side of the second fixing member 3284 away from the retaining member 3281. The limiting member 3285 can be generally plate-shaped. The limiting member 3285 has three slots 3285a spaced apart from each other, each extending to one side of the limiting member 3285. The three slots 3285a, the three third through holes 3284a, the three second through holes 3282a, and the three first through holes 3281a can be arranged in the same or similar shapes and spacing.

[0163] For example, the elastic member 3283 is located between the second fixing member 3284 and the locking member 3281. The elastic member 3283 includes three springs. In other embodiments, the elastic member 3283 can also be made of elastic materials such as elastic rubber, which is not strictly limited in this application.

[0164] Illustratively, one end of the first rotating shaft 3286 is provided with a limiting flange 3286a, and the other end of the first rotating shaft 3286 is provided with a limiting slot 3286b. The first rotating shaft 3286 is inserted into the first fixing member 3282, the retaining member 3281, the elastic member 3283, the second fixing member 3284, and the limiting member 3285. Specifically, the first rotating shaft 3286 passes through one of the second through holes 3282a of the first fixing member 3282, one of the first through holes 3281a of the retaining member 3281, the inner space of one of the springs of the elastic member 3283, one of the third through holes 3284a of the second fixing member 3284, and one of the retaining slots 3285a of the limiting member 3285. The limiting flange 3286a of the first rotating shaft 3286 is located on the side of the first fixing member 3282 facing away from the retaining member 3281. The limiting flange 3286a of the first rotating shaft 3286 is used to limit the first fixing member 3282. The limiting member 3285 is engaged with the limiting groove 3286b of the first rotating shaft 3286. The limiting groove 3286b of the first rotating shaft 3286 is used to limit the limiting member 3285, thereby limiting the second fixing member 3284 through the limiting member 3285. In other embodiments, the first rotating shaft 3286 can also be welded, bonded, or otherwise secured to the second fixing member 3284.

[0165] One end of the second rotating shaft 3287 is provided with a limiting flange 3287a, and the other end of the second rotating shaft 3287 is provided with a limiting slot 3287b. The second rotating shaft 3287 is inserted into the first fixing member 3282, the retaining member 3281, the elastic member 3283, the second fixing member 3284, and the limiting member 3285. The second rotating shaft 3287 passes through the other second through-hole 3282a of the first fixing member 3282, the other first through-hole 3281a of the retaining member 3281, the inner space of the other spring of the elastic member 3283, the other third through-hole 3284a of the second fixing member 3284, and the other retaining slot 3285a of the limiting member 3285. The limiting flange 3287a of the second rotating shaft 3287 is located on the side of the first fixing member 3282 facing away from the retaining member 3281. The limiting flange 3287a of the second rotating shaft 3287 is used to limit the first fixing member 3282. The limiting member 3285 is engaged with the limiting groove 3287b of the second rotating shaft 3287. The limiting groove 3287b of the second rotating shaft 3287 is used to limit the limiting member 3285, thereby limiting the second fixing member 3284 through the limiting member 3285. In other embodiments, the second rotating shaft 3287 can also be welded, bonded, or otherwise secured to the second fixing member 3284.

[0166] One end of the third rotating shaft 3288 is provided with a limiting flange 3288a, and the other end of the third rotating shaft 3288 is provided with a limiting slot 3288b. The third rotating shaft 3288 is inserted into the first fixing member 3282, the retaining member 3281, the elastic member 3283, the second fixing member 3284, and the limiting member 3285. The third rotating shaft 3288 passes through the other second through-hole 3282a of the first fixing member 3282, the other first through-hole 3281a of the retaining member 3281, the inner space of the other spring of the elastic member 3283, the other third through-hole 3284a of the second fixing member 3284, and the other retaining slot 3285a of the limiting member 3285. The limiting flange 3288a of the third rotating shaft 3288 is located on the side of the first fixing member 3282 facing away from the retaining member 3281. The limiting flange 3288a of the third rotating shaft 3288 is used to limit the first fixing member 3282. The limiting member 3285 is engaged with the limiting groove 3288b of the third rotating shaft 3288. The limiting groove 3288b of the third rotating shaft 3288 is used to limit the limiting member 3285, thereby limiting the second fixing member 3284 through the limiting member 3285. In other embodiments, the third rotating shaft 3288 can also be welded, bonded, or otherwise secured to the second fixing member 3284.

[0167] Please refer to FIG. 12 , FIG. 13B , FIG. 15 and FIG. 16 . FIG. 16 is a partial structural diagram of the bottom connection assembly 32 shown in FIG. 9 .

[0168] In some embodiments, the first synchronous gear 3271 of the synchronous assembly 327 is located between the locking member 3281 and the first fixed member 3282. The first rotating shaft 3286 passes through the rotating shaft hole 3271c of the first synchronous gear 3271, and the cam surface 3271d of the first synchronous gear 3271 faces the cam surface 3281c of the locking member 3281, and the two cooperate with each other. The second synchronous gear 3272 of the synchronous assembly 327 is located between the locking member 3281 and the first fixed member 3282 and meshes with the first synchronous gear 3271. The second rotating shaft 3287 passes through the rotating shaft hole 3272c of the second synchronous gear 3272, and the cam surface 3272d of the second synchronous gear 3272 faces the cam surface 3281c of the locking member 3281, and the two cooperate with each other. The first end 3231 of the first connecting arm 323 is located between the locking member 3281 and the first fixed member 3282 and meshes with the second synchronous gear 3272. The third rotating shaft 3288 passes through the rotating shaft hole 323a of the first end 3231 of the first connecting arm 323. The cam surface of the first end 3231 of the first connecting arm 323 faces the cam surface 3281c of the locking member 3281, and the two cooperate with each other.

[0169] After the synchronization component 327, the first connecting arm 323 and the damping component 328 are assembled, the elastic member 3283 of the damping component 328 is in a compressed state. Since the first fixing member 3282 is limited by the limiting flanges of multiple rotating shafts (3286, 3287, 3288), the limiting member 3285 is limited by the limiting grooves of multiple rotating shafts (3286, 3287, 3288), and the second fixing member 3284 is limited by the limiting member 3285, the elastic force generated by the elastic member 3283 pushes the locking member 3281 to move in the direction close to the first fixing member 3282 or makes the locking member 3281 have a movement tendency close to the first fixing member 3282, so the locking member 3281 is in abutment with the first synchronization gear 3271, the second synchronization gear 3272 and the first end 3231 of the first connecting arm 323.

[0170] In some usage conditions, the cam surface 3271d of the first synchronous gear 3271 is snap-fitted with the cam surface 3281c of the locking member 3281, the cam surface 3272d of the second synchronous gear 3272 is snap-fitted with the cam surface 3281c of the locking member 3281, and the cam surface of the first end 3231 of the first connecting arm 323 is snap-fitted with the cam surface 3281c of the locking member 3281. The first synchronous gear 3271, the second synchronous gear 3272 and the first end 3231 of the first connecting arm 323 form a snap-fitting structure with the locking member 3281. In other operating states, relative to the aforementioned operating state, the first synchronous gear 3271, the second synchronous gear 3272, and the first end 3231 of the first connecting arm 323 rotate relative to the retaining member 3281, gradually disengaging the first synchronous gear 3271, the second synchronous gear 3272, and the first end 3231 of the first connecting arm 323 from the retaining member 3281 and then gradually re-engaging with the retaining member 3281. During the process of gradually disengaging from the initial retaining structure, the elastic force of the elastic member 3283 forms a damping force that prevents the first synchronous gear 3271, the second synchronous gear 3272, and the first end 3231 of the first connecting arm 323 from rotating. During the process of gradually re-engaging with the retaining member 3281, the elastic force of the elastic member 3283 also forms a force that propels the first synchronous gear 3271, the second synchronous gear 3272, and the first end 3231 of the first connecting arm 323 to rotate.

[0171] It will be appreciated that in the embodiment of the present application, when the rotating shaft of the damping assembly 328 is a through-type rotating shaft, that is, the rotating shaft passes through the entire damping assembly 328, the number of rotating shafts of the damping assembly 328 can be equal to the number of synchronous gears of the synchronization assembly 327 plus one. For example, when there are two synchronous gears, the number of rotating shafts of the damping assembly 328 is three, and when there are four synchronous gears, the number of rotating shafts of the damping assembly 328 is five. The number of first through-holes 3281a, second through-holes 3282a, third through-holes 3284a, slots 3285a, and springs can be the same as the number of rotating shafts. In some embodiments, the number of springs can also be less than the number of rotating shafts.

[0172] In some other embodiments, the rotating shaft of the damping assembly 328 may also be a split rotating shaft, that is, at least part of the rotating shaft does not run through the entire damping assembly 328, but is applied to a partial area of ​​the damping assembly 328. For example, the damping assembly 328 may include two areas, and the two areas may be set with different numbers of rotating shafts. For example, three rotating shafts may be set in one area, and two rotating shafts may be set in the other area. The elastic member 3283 may be set in one of the areas, and the number of springs of the elastic member 3283 may be the same as or different from the number of rotating shafts in the corresponding area. The elastic force generated by the elastic member 3283 can push the locking member 3281 to move.

[0173] In other embodiments, the first synchronous gear 3271 and the second synchronous gear 3272 may also have cam surfaces on both end surfaces. Accordingly, the surface of the first fixing member 3282 facing the first synchronous gear 3271 and the second synchronous gear 3272 may be cam surfaces. Accordingly, both end surfaces of the first end 3231 of the first connecting arm 323 may also be cam surfaces.

[0174] As can be seen from the above, the damping component 328 in the embodiment of the present application can be implemented in multiple ways. The damping component 328 can provide damping force during the rotation of the first connecting arm 323. The specific implementation structure of the damping component 328 in the embodiment of the present application is not strictly limited.

[0175] Please refer to FIG. 17 , which is a schematic structural diagram of the second connecting arm 324 shown in FIG. 10 .

[0176] In some embodiments, the second connecting arm 324 includes a first end 3241 and a second end 3242. The first end 3241 of the second connecting arm 324 can be a rotating end, and can include an arc-shaped arm. The second end 3242 of the second connecting arm 324 can be a sliding end, and can include a slider. The second connecting arm 324 can also include a connecting section 3243, which connects the first end 3241 and the second end 3242. The connecting section 3243 of the second connecting arm 324 can have a rotating shaft hole 324a. The connecting section 3243 of the second connecting arm 324 can also have an escape space 324b, which is connected to the rotating shaft hole 324a.

[0177] Please refer to Figures 7, 18 and 19 in combination. Figure 18 is a schematic diagram of the assembly structure of the main shaft 31 shown in Figure 7 and the partial structure of the bottom connecting component 32 shown in Figure 9, and Figure 19 is a schematic diagram of the partial structure of the structure shown in Figure 18.

[0178] In some embodiments, the damping assembly 328, the synchronizing assembly 327, and the first end 3231 of the first connecting arm 323 are mounted in the mounting space 318 of the main shaft 31, while the second end 3232 of the first connecting arm 323 and the connecting section 3233 of the first connecting arm 323 are positioned outside the main shaft 31 through the second notch 319. The entire position of the damping assembly 328 can be fixed relative to the main shaft 31. For example, the damping assembly 328 can be fixed or substantially fixed relative to the main shaft 31 by having the first fixing member 3282 and the second fixing member 3284 of the damping assembly 328 engage with the positioning slot 3110 of the main shaft 31. At this time, since the first synchronous gear 3271 is sleeved on the first rotating shaft 3286 of the damping assembly 328, the first synchronous gear 3271 is rotated to connect to the main shaft 31; since the second synchronous gear 3272 is sleeved on the second rotating shaft 3287 of the damping assembly 328, the second synchronous gear 3272 is rotated to connect to the main shaft 31, and the first end 3231 of the first connecting arm 323 is sleeved on the third rotating shaft 3288 of the damping assembly 328, and the first end 3231 of the first connecting arm 323 is rotated to connect to the main shaft 31.

[0179] In this embodiment, by assembling the damping assembly 328, the synchronizing assembly 327, and the first connecting arm 323 into a modular structure, the integration of components is improved, the installation process of the folding assembly 3 is simplified, and the cost is reduced. Furthermore, through the modular structural design, the damping assembly 328, while providing a damping force for the synchronizing assembly 327 and the first connecting arm 323, can also, after being installed on the main shaft 31, allow the synchronizing assembly 327 and the first connecting arm 323 to be rotatably connected to the main shaft 31 via the rotating shaft of the damping assembly 328. This eliminates the need for additional rotating structure (such as the mating structure of a rotating shaft and a rotating groove) for achieving the rotational connection between the synchronizing assembly 327 and the first connecting arm 323 and the main shaft 31. This simplifies the structure of the folding assembly 3 and reduces the cost of the folding assembly 3.

[0180] It is understandable that in some other embodiments, the synchronization component 327 and the first connecting arm 323 may not form a modular structure with the damping component 328, and the damping component 328 still provides damping force for the synchronization component 327 and / or the first connecting arm 323. The synchronization component 327 and the first connecting arm 323 are connected to the main shaft 31 through other structures, for example, by setting a rotating shaft by themselves, or by inserting an external rotating shaft, etc. The embodiments of the present application do not strictly limit this.

[0181] In some embodiments, the first end 3211 of the rotating arm 321 is mounted on the main shaft 31. For example, the arcuate arm 321c of the first end 3211 of the rotating arm 321 is mounted on the first arcuate groove 315 of the main shaft 31. The connecting rod 321b of the first end 3211 of the rotating arm 321 is mounted on the first portion 3171 of the mounting groove 317 of the main shaft 31. The connecting gear 321a of the first end 3211 of the rotating arm 321 is mounted on the second portion 3172 of the mounting groove 317 of the main shaft 31. The second end 3212 of the rotating arm 321 is located outside the main shaft 31 through the first notch 316.

[0182] The arcuate arm 321c of the first end 3211 of the rotating arm 321 cooperates with the first arcuate groove 315 of the main shaft 31, thereby enabling the first end 3211 of the rotating arm 321 to be rotationally connected to the main shaft 31 via a virtual axis. In other embodiments, the first end 3211 of the rotating arm 321 may also be rotationally connected to the main shaft 31 via a physical axis.

[0183] Among them, the cooperation between the connecting rod 321b and the connecting gear 321a of the first end 3211 of the rotating arm 321 and the mounting groove 317 of the main shaft 31 enables the connecting rod 321b and the connecting gear 321a of the first end 3211 of the rotating arm 321 to rotate better relative to the main shaft 31, and also prevents the connecting gear 321a from tilting, so as to improve the connection reliability between the first end 3211 of the rotating arm 321 and the main shaft 31.

[0184] The connecting gear 321a of the first end 3211 of the rotating arm 321 engages the first synchronizing gear 3271 of the synchronizing assembly 327. At this point, the first end 3211 of the rotating arm 321 engages with the first end 3231 of the first connecting arm 323 via the first synchronizing gear 3271 and the second synchronizing gear 3272 of the synchronizing assembly 327. This synchronizes the rotation of the rotating arm 321 and the rotation of the first connecting arm 323 relative to the main shaft 31, allowing them to move toward or away from each other synchronously. Furthermore, the damping assembly 328 provides a damping force for the rotating arm 321 via the first synchronizing gear 3271, resulting in a high degree of structural integration for the folding assembly 3.

[0185] It can be understood that in other embodiments, when the synchronization component 327 and the damping component 328 are not assembled into a modular structure, that is, when the synchronization component 327 and the damping component 328 are separated, the connecting gear 321a of the first end 3211 of the rotating arm 321 can still be connected to the damping component 328 through a gear with a cam surface, so that the damping component 328 can provide damping force for the rotating arm 321.

[0186] In some embodiments, the first end 3241 of the second connecting arm 324 is mounted in the second arcuate slot 3120 of the main shaft 31, while the connecting section 3243 of the second connecting arm 324 and the second end 3242 of the second connecting arm 324 are located outside the main shaft 31. The engagement of the first end 3241 of the second connecting arm 324 with the second arcuate slot 3120 of the main shaft 31 enables a rotational connection between the first end 3241 of the second connecting arm 324 and the main shaft 31 via a virtual axis. In other embodiments, the first end 3241 of the second connecting arm 324 may also be rotationally connected to the main shaft 31 via a physical axis.

[0187] In some embodiments, as shown in Figures 10 and 18, the insertion shaft 323f of the first connecting arm 323 is inserted into one end of the connecting rod 325 to rotate the connecting rod 325. The connecting shaft 326 is inserted into the rotating shaft hole 3243a of the connecting section 3243 of the second connecting arm 324. The connecting shaft 326 is also inserted into the other end of the connecting rod 325, and the second connecting arm 324 rotates the connecting rod 325.

[0188] Please refer to FIG. 20 , which is a schematic structural diagram of the fixing bracket 322 shown in FIG. 10 .

[0189] In some embodiments, the fixing frame 322 may have a first surface 322a, a second surface 322b, a third surface 322c, and a fourth surface 322d. The first surface 322a is disposed opposite the second surface 322b, and the third surface 322c is disposed opposite the fourth surface 322d. The fixing frame 322 may include a first sliding groove 3221, a second sliding groove 3222, an avoidance groove 3223, a first rotation groove 3224, and a second rotation groove 3225. The extension direction of the first sliding groove 3221 is not parallel to the extension direction of the second sliding groove 3222. The openings at both ends of the first sliding groove 3221, which are arranged along its extension direction, may be located on the first surface 322a and the second surface 322b, respectively. The openings at both ends of the second sliding groove 3222, which are arranged along its extension direction, may be located on the third surface 322c and the fourth surface 322d, respectively.

[0190] When a slider or other structure is installed in the first slide groove 3221, it can slide relative to the fixed frame 322 along the extension direction of the first slide groove 3221. When a slider or other structure is installed in the second slide groove 3222, it can slide relative to the fixed frame 322 along the extension direction of the second slide groove 3222. When projected from one end of the fixed frame 322 to the other end, the extension direction of the first slide groove 3221 intersects with the extension direction of the second slide groove 3222. The first slide groove 3221 can extend through both sides of the fixed frame 322; the second slide groove 3222 can be located near one side of the fixed frame 322. The avoidance groove 3223 connects to the second slide groove 3222 and extends through the other side of the fixed frame 322.

[0191] The first rotation groove 3224 and the second rotation groove 3225 can be located at both ends of the fixing frame 322, and both the first rotation groove 3224 and the second rotation groove 3225 are arc-shaped grooves with their center lines coinciding. The first rotation groove 3224 can extend from the first surface 322a to the interior of the fixing frame 322.

[0192] Please refer to Figures 21, 22A and 22B in combination. Figure 21 is a partial structural schematic diagram of the folding device 10 shown in Figure 3, Figure 22A is a cross-sectional structural schematic diagram of the structure shown in Figure 21 along EE, and Figure 22B is a cross-sectional structural schematic diagram of the structure shown in Figure 22A in another usage state.

[0193] In some embodiments, the first end 3211 of the rotating arm 321 is rotatably connected to the main shaft 31, and the second end 3212 of the rotating arm 321 is fixedly connected to the first housing 1. The first housing 1 and the second end 3212 of the rotating arm 321 maintain the same motion state, and the first housing 1 can rotate relative to the main shaft 31 via the rotating arm 321. In other words, the first housing 1 is rotatably connected to the main shaft 31, and the rotation center is the rotation center of the rotating arm 321 relative to the main shaft 31.

[0194] In this embodiment, the folding device 10 realizes the connection between the first shell 1 and the main shaft 31 through the rotating arm 321. The connection relationship is simple, the number of components is small, and it is easy to manufacture and assemble, which is conducive to mass production to reduce the cost of the folding device 10. At the same time, it is also easy to accurately control the movement path of the first shell 1, which is conducive to the accurate control of the movement form of the folding device 10.

[0195] The second end 3212 of the rotating arm 321 can be fixedly connected to the first shell 1 through the first set of connecting members 3291. In other embodiments, the second end 3212 of the rotating arm 321 can also be fixedly connected to the first shell 1 by snapping, bonding or other connection methods, which is not strictly limited in this application.

[0196] Illustratively, the fixing frame 322 is fixedly connected to the second housing 2, and the second housing 2 and the fixing frame 322 maintain the same motion state. Illustratively, the fixing frame 322 can be fixedly connected to the second housing 2 via a second set of connecting members 3292. In other embodiments, the fixing frame 322 can also be fixedly connected to the second housing 2 via snap-fitting, bonding, or other connection methods, which are not strictly limited in this application.

[0197] In this embodiment, during the relative movement between the first housing 1 and the second housing 2 , the rotating arm 321 rotates relative to the main shaft 31 , and the fixing frame 322 moves relative to the main shaft 31 .

[0198] Please refer to Figure 21, Figure 23A and Figure 23B. Figure 23A is a schematic cross-sectional structure diagram of the structure shown in Figure 21 taken along FF, and Figure 23B is a schematic cross-sectional structure diagram of the structure shown in Figure 23A in another usage state.

[0199] In some embodiments, the first end 3231 of the first connecting arm 323 is rotatably connected to the main shaft 31, and the second end 3232 of the first connecting arm 323 is slidably connected to the fixed frame 322. Specifically, the slider 323d (see FIG. 12 ) of the second end 3232 of the first connecting arm 323 can be mounted in the first slide groove 3221 of the fixed frame 322 and can slide relative to the fixed frame 322 along the extension direction of the first slide groove 3221. In other embodiments, a slide groove can be provided on the second end 3232 of the first connecting arm 323, and a slider can be provided on the fixed frame 322. The cooperation between the slide groove and the slider enables the sliding connection between the second end 3232 of the first connecting arm 323 and the fixed frame 322. The embodiments of the present application do not strictly limit the specific structure for achieving the sliding connection between the second end 3232 of the first connecting arm 323 and the fixed frame 322.

[0200] Please refer to Figure 21, Figure 24A and Figure 24B. Figure 24A is a schematic cross-sectional structure diagram of the structure shown in Figure 21 taken along GG, and Figure 24B is a schematic cross-sectional structure diagram of the structure shown in Figure 24A in another use state.

[0201] In some embodiments, the first end 3241 of the second connecting arm 324 is rotationally connected to the main shaft 31, and the second end 3242 of the second connecting arm 324 is slidably connected to the fixed frame 322. The slider of the second end 3242 of the second connecting arm 324 can be mounted in the second slide groove 3222 of the fixed frame 322 and can slide relative to the fixed frame 322 along the extension direction of the second slide groove 3222. In other embodiments, a slide groove can be provided on the second end 3242 of the second connecting arm 324, and a slider can be provided on the fixed frame 322. The cooperation between the slide groove and the slider achieves a sliding connection between the second end 3242 of the second connecting arm 324 and the fixed frame 322. The specific structure for achieving the sliding connection between the second end 3242 of the second connecting arm 324 and the fixed frame 322 is not strictly limited in the embodiments of the present application. The connecting section 3243 of the second connecting arm 324 can be at least partially located in the avoidance groove 3223 of the fixed frame 322.

[0202] Please refer to FIG. 23A to FIG. 24B and FIG. 25 . FIG. 25 is a schematic diagram showing the mechanism of relative motion among the first connecting arm 323 , the second connecting arm 324 and the fixing frame 322 shown in FIG. 21 .

[0203] In this embodiment, the first end 3231 of the first connecting arm 323 is rotatably connected to the main shaft 31, and the second end 3232 of the first connecting arm 323 is slidably connected to the fixed frame 322 to form a connecting rod slider mechanism; the first end 3241 of the second connecting arm 324 is rotatably connected to the main shaft 31, and the second end 3242 of the second connecting arm 324 is slidably connected to the fixed frame 322 to form a connecting rod slider mechanism.

[0204] Furthermore, the rotation center 32310 of the first end 3231 of the first connecting arm 323 (i.e., the rotation center of the first connecting arm 323 when rotating relative to the main shaft 31) can be located within the main shaft 31, for example, below the support surface 314 of the main shaft 31. The rotation center 32410 of the first end 3241 of the second connecting arm 324 (i.e., the rotation center of the second connecting arm 324 when rotating relative to the main shaft 31) can be located outside the main shaft 31, for example, above the support surface 314 of the main shaft 31. The rotation center 32410 of the first end 3241 of the second connecting arm 324 does not coincide with the rotation center 32310 of the first end 3231 of the first connecting arm 323. Because the flexible display 20 is located above the main shaft 31, the rotation center 32410 of the first end 3241 of the second connecting arm 324 is closer to the flexible display than the rotation center 32310 of the first end 3231 of the first connecting arm 323.

[0205] In addition, the extension direction of the first sliding groove 3221 of the fixing frame 322 is not parallel to the extension direction of the second sliding groove 3222, and the sliding direction of the second end 3232 of the first connecting arm 323 relative to the fixing frame 322 is not parallel to the sliding direction of the second end 3242 of the second connecting arm 324 relative to the fixing frame 322.

[0206] Therefore, in this embodiment, the connection between the second housing 2 and the main shaft 31 is achieved through the cooperation of the double-link slider mechanism, allowing the second housing 2 to move relative to the main shaft 31. This reduces the number of components, simplifies the coordination relationship and positioning, and makes the components easy to manufacture and assemble, thus facilitating mass production and reducing the cost of the folding device 10. Furthermore, because the main shaft 31 is linked to the fixed frame 322 via the first connecting arm 323 and the second connecting arm 324, the movement path of the second housing 2 is accurate, facilitating accurate control of the movement of the folding device 10, and providing the folding device 10 with excellent mechanical tensile and compressive resistance.

[0207] Furthermore, in this embodiment, by rationally designing the extension directions of the first and second slide slots 3221 and 3222, the rotation angles of the first and second connecting arms 323 and 324 relative to the main shaft 31 are each no greater than 90°. Compared to existing solutions, this effectively reduces the rotation angle of the second connecting arm 324. This allows for a thicker wall in the local structure of the second connecting arm 324 (e.g., the structure within the dashed box of the second connecting arm 324 shown in FIG17 ). This wall thickness design satisfies structural strength requirements, thereby improving the structural reliability of the second connecting arm 324. Furthermore, due to the relatively small rotation angles of the first and second connecting arms 323 and 324, the need to reduce the thickness of some components of the electronic device 100 to accommodate the rotation of the first and second connecting arms 323 and 324 can be effectively avoided, thereby improving the overall structural reliability of the electronic device 100.

[0208] 22A to 24B , in this embodiment, the folding assembly 3 of the folding device 10 adopts an asymmetric structure. The first shell 1 is rotatably connected to the main shaft 31 through the rotating arm 321, and the second shell 2 is movably connected to the main shaft 31 through the first connecting arm 323, the second connecting arm 324 and the fixing frame 322 to achieve relative movement between the first shell 1 and the second shell 2. The folding assembly 3 has fewer parts, a simpler structure and a lower cost.

[0209] In addition, since the first shell 1 is rotatably connected to the main shaft 31 via the rotating arm 321, after the first shell 1 rotates relative to the main shaft 31 to a closed state, no concave space is reserved at the connection between the first shell 1 and the main shaft 31 for accommodating the flexible display 20. The second shell 2 is connected to the main shaft 31 via the first connecting arm 323 and the second connecting arm 324, for example, by a double-link slider mechanism. After the second shell 2 rotates relative to the main shaft 31 to a closed state, a concave space for accommodating the flexible display 20 can be reserved at the connection between the second shell 2 and the main shaft 31. Therefore, when the first shell 1 and the second shell 2 are folded relative to each other to a closed state, a receiving space 30 offset toward the second shell 2 is formed between the first shell 1 and the second shell 2 and inside the folding assembly 3. Based on the shape of the receiving space 30 offset to one side, compared with the symmetrical space of the traditional foldable electronic device 100, the portion of the flexible display 20 accommodated in the receiving space 30 can have fewer bending positions, thereby reducing the risk of damage to the flexible display 20, improving the reliability of the flexible display 20, and extending the service life of the flexible display 20. The specific shape changes of the flexible display screen 20 in the open state and the closed state are described in the relevant embodiments below.

[0210] Please refer to FIG. 26 , which is a schematic diagram showing the positional relationship among the first housing 1 , the second housing 2 and the main shaft 31 shown in FIG. 21 .

[0211] As can be seen from the foregoing description, the folding assembly 3 employs an asymmetric structure. The first housing 1 is rotationally connected to the main shaft 31, and the second housing 2 is movably connected to the main shaft 31. During the relative motion of the first housing 1 and the second housing 2, the motion paths of the first housing 1 and the second housing 2 are asymmetric, and the motion strokes of the first housing 1 and the second housing 2 relative to the main shaft 31 are asymmetric. Specifically, the motion path of the first housing 1 relative to the main shaft 31 is an arc, while the motion path of the second housing 2 relative to the main shaft 31 is a spline curve.

[0212] As shown in Figure 26, during the relative movement of the first shell 1 and the second shell 2, the first shell 1 can rotate around the first rotation center O-1 relative to the main shaft 31, and the second shell 2 can rotate approximately around the second rotation center O-2 relative to the main shaft 31, and the second rotation center O-2 is lower than the first rotation center O-1. In the process of the first shell 1 and the second shell 2 moving from the open state (corresponding to the solid line position) to the closed state (corresponding to the dotted line position), the first shell 1 moves a larger stroke above the support surface 314 of the main shaft 31, and the second shell 2 moves a smaller stroke above the support surface 314 of the main shaft 31. Combined with Figures 22B, 23B and 24B, when the second shell 2 is in the closed state, the receiving space 30 inside the second shell 2 and the folding component 3 is larger to better accommodate the flexible display screen 20.

[0213] For example, as shown in FIG26 , the main shaft 31 further includes an outer surface 3140. The outer surface 3140 of the main shaft 31 is disposed away from the support surface 314 of the main shaft 31, that is, away from the flexible display screen 20. When the first shell 1 and the second shell 2 are unfolded relative to each other to an open state, the first shell 1 and the second shell 2 are spliced ​​together and jointly shield the outer surface 3140 of the main shaft 31. When the first shell 1 and the second shell 2 are folded relative to each other to a closed state, a portion of the outer surface 3140 of the main shaft 31 is exposed relative to the first shell 1 and the second shell 2, and the two side edges of the outer surface 3140 of the main shaft 31 are shielded by the first shell 1 and the second shell 2.

[0214] In this embodiment, when the first shell 1 and the second shell 2 are in the open state, the two shells are spliced ​​together and jointly shield the main shaft 31, so that the electronic device 100 has no obvious broken structure or gap at the connection between the two shells, and the appearance of the electronic device 100 is relatively complete. When the first shell 1 and the second shell 2 are in the closed state, the two shells surround the two side edges of the main shaft 31, and there is no obvious cut structure or gap at the connection between the two shells and the main shaft 31, so the appearance of the electronic device 100 is relatively complete. Therefore, the electronic device 100 has a relatively good appearance integrity in both the open and closed states, and external debris is not easily infiltrated into the inner side of the folding assembly 3, which is conducive to improving the reliability of the electronic device 100.

[0215] It should be noted that, referring to Figures 1 and 26, when the first shell 1 and the second shell 2 are in the open state, the splicing of the first shell 1 and the second shell 2 may include a situation where the first shell 1 and the second shell 2 partially or completely abut each other, or a situation where a small gap exists between the first shell 1 and the second shell 2. In this embodiment, the splicing of the first shell 1 and the second shell 2 can limit the relative unfolding angle of the first shell 1 and the second shell 2 to a certain extent, realize the stop position of the unfolding action of the first shell 1 and the second shell 2, and prevent the electronic device 100 from being over-folded during the unfolding process, thereby ensuring that the flexible display 20 is in a flat state so that the user can use it with the maximum width. At the same time, it can also reduce the force on the flexible display 20 and improve the reliability of the flexible display 20 and the electronic device 100.

[0216] Referring to Figures 2 and 26, when the first shell 1 and the second shell 2 are in a closed state, the first shell 1 and the second shell 2 can be completely closed. It should be noted that when the first shell 1 and the second shell 2 are closed, the first shell 1 and the second shell 2 may partially or completely abut against each other, or there may be a small gap between the first shell 1 and the second shell 2. In this embodiment, there is only a space in the middle between the first shell 1 and the second shell 2 to accommodate the flexible display 20, and there is no large gap at the edge, so as to enhance the beautification of the appearance of the shell and the electronic device 100, and also prevent foreign objects outside the electronic device 100 from entering the closed electronic device 100, thereby improving the reliability of the electronic device 100.

[0217] For example, as shown in FIG26 , the outer surface 3140 of the main shaft 31 includes a first region 3140a, a second region 3140b, and a third region 3140c. The second region 3140b is connected between the first and third regions 3140a and 3140c. The first region 3140a is located near the first housing 1, and the third region 3140c is located near the second housing 2. The first region 3140a may be an arcuate surface, the center of which may coincide with the first rotation center O-1 of the first housing 1. This allows for better aesthetics while avoiding rotation of the first housing 1 and ensuring the reliability of the mechanism. The third region 3140c may be a curved surface, the cross-section of which along the width of the main shaft 31 is a spline curve. This spline curve can conform to the motion path of the second housing 2 relative to the main shaft 31. This allows for better aesthetics while avoiding rotation of the second housing 2 and ensuring the reliability of the mechanism. The second region 3140b may be a plane, and there is a smooth transition between the second region 3140b and the first region 3140a, and there is a smooth transition between the second region 3140b and the third region 3140c.

[0218] In some embodiments, as shown in FIG26 , the first housing 1 may further include a first end surface 13 proximate to the main axis 31, and the second housing 2 may further include a second end surface 23 proximate to the main axis 31. For example, when the first housing 1 and the second housing 2 are relatively unfolded to an open state, the first end surface 13 faces the second end surface 23. The first end surface 13 and the second end surface 23 are in contact, and even if there is a slight gap between the first end surface 13 and the second end surface 23, the first end surface 13 and the second end surface 23 are considered to be in contact.

[0219] Exemplarily, when the first shell 1 and the second shell 2 are folded relative to each other to a closed state, the first end face 13 and the second end face 23 are oriented in the same direction, and in the thickness direction of the main shaft 31, the distance between the first end face 13 and the outer surface 3140 of the main shaft 31 is greater than the distance between the second end face 23 and the outer surface 3140 of the main shaft 31. Among them, the distance between the first end face 13 and the outer surface 3140 of the main shaft 31 refers to the maximum distance between the center point of the first end face 13 and the outer surface 3140 of the main shaft 31 in the thickness direction of the main shaft 31. For example, in this embodiment, the distance can be the distance S1 between the center point of the first end face 13 and the second area 3140b of the outer surface 3140 of the main shaft 31; the distance between the second end face 23 and the outer surface 3140 of the main shaft 31 refers to the maximum distance between the center point of the second end face 23 and the outer surface 3140 of the main shaft 31 in the thickness direction of the main shaft 31. For example, in this embodiment, the distance can be the distance S2 between the center point of the second end face 23 and the second area 3140b of the outer surface 3140 of the main shaft 31.

[0220] Among them, when the first shell 1 and the second shell 2 are in the open state, the first end face 13 and the second end face 23 can be tilted relative to the thickness direction of the main axis 31; when the first shell 1 and the second shell 2 are in the closed state, the first end face 13 and the second end face 23 can be flush with each other to improve the appearance experience and grip feel of the electronic device 100.

[0221] In some embodiments, as shown in Figures 18, 24A, and 24B, one end of the connecting rod 325 is rotatably connected to the first connecting arm 323, and the other end of the connecting rod 325 is rotatably connected to the second connecting arm 324. In this way, the first connecting arm 323, the connecting rod 325, the second connecting arm 324, and the main shaft 31 can form a four-bar linkage. This prevents the first connecting arm 323 and the second connecting arm 324 from jamming during the relative rotation of the first housing 1 and the second housing 2, thereby improving the reliability of the mechanism.

[0222] Referring again to Figures 22A and 23A, in some embodiments, the synchronization assembly 327 engages the first end 3211 of the rotating arm 321 and the first end 3231 of the first connecting arm 323. Specifically, the first synchronization gear 3271 engages the connecting gear 321a of the rotating arm 321 to engage the first end 3211 of the rotating arm 321. The second synchronization gear 3272 engages the first synchronization gear 3271 and the first end 3231 of the first connecting arm 323. In this embodiment, the synchronization assembly 327 synchronizes the rotation of the rotating arm 321 relative to the main shaft 31 and the rotation of the first connecting arm 323 relative to the main shaft 31, thereby improving the user's operating experience of the mechanism.

[0223] For example, as shown in Figures 23A and 23B, the first synchronization gear 3271 is located below the connecting gear 321a in the thickness direction of the main shaft 31. Since the flexible display 20 is located above the main shaft 31, the first synchronization gear 3271 is located on the side of the connecting gear 321a facing away from the flexible display 20 in the thickness direction of the main shaft 31. In this embodiment, the vertical arrangement of the connecting gear 321a and the first synchronization gear 3271 fully utilizes the thickness of the main shaft 31. The first synchronization gear 3271 and the connecting gear 321a reuse part of the width of the main shaft 31, which helps reduce the width of the main shaft 31 and achieve miniaturization of the main shaft 31.

[0224] The pitch circle diameter of the second synchronous gear 3272 can be different from the pitch circle diameter of the first synchronous gear 3271 to better match the position of the first synchronous gear 3271 and the first end 3231 of the first connecting arm 323, thereby achieving meshing transmission. Furthermore, since the second synchronous gear 3272 is a partial gear, the position of the teeth and the toothless area of ​​the second synchronous gear 3272 can be adjusted to minimize the space required for movement while ensuring meshing connection. This reduces the space required for the spindle 31, for example, the space required in the thickness direction of the spindle 31, thereby facilitating a thinner spindle 31.

[0225] For example, as shown in FIG23A , when the first housing 1 and the second housing 2 are relatively unfolded to an open state, the tooth portion 321e of the connecting gear 321a faces the first synchronization gear 3271 and is located within the main shaft 31. The supporting surface 321f of the connecting gear 321a is flush with the supporting surface 314 of the main shaft 31. In this state, the connecting gear 321a can be used together with the main shaft 31 to support the flexible display 20, thereby increasing the integrity and flatness of the supporting environment for the flexible display 20. Furthermore, the connecting gear 321a is an incomplete gear, which reduces its own size while satisfying the connection relationship. This helps reduce the thickness of the main shaft 31 on which the connecting gear 321a is mounted, thereby facilitating a thinner main shaft 31.

[0226] As shown in FIG23B , when the first housing 1 and the second housing 2 are folded relative to each other into a closed state, the connecting gear 321a rotates relative to the main shaft 31, and the tooth portion 321e of the connecting gear 321a partially rotates out of the main shaft 31, with the supporting surface 321f of the connecting gear 321a facing the receiving space 30. At this time, the connecting gear 321a can move in the space above the main shaft 31, so that the main shaft 31 only needs to reserve a portion of space for the connecting gear 321a to move, which helps to reduce the thickness of the main shaft 31 and achieve miniaturization of the main shaft 31.

[0227] For example, as shown in Figures 23A and 23B , in the width direction of the main shaft 31, the rotation center 32710 of the first synchronous gear 3271 is farther away from the second synchronous gear 3272 relative to the rotation center 32110 of the connecting gear 321a. In this embodiment, the positions of the rotation center 32710 of the first synchronous gear 3271 and the rotation center 32110 of the connecting gear 321a ensure that the first synchronous gear 3271 and the connecting gear 321a are always in meshing, preventing idling and improving the reliability of the folding device 10. In some embodiments, when the first shell 1 and the second shell 2 are in an open state, the projection of the rotation center 32710 of the first synchronous gear 3271 on the support surface 314 of the main shaft 31 is a first projection, the projection of the rotation center 32110 of the connecting gear 321a on the support surface 314 of the main shaft 31 is a second projection, and the projection of the rotation center of the second synchronous gear 3272 on the support surface 314 of the main shaft 31 is a third projection, and the distance between the first projection and the third projection is greater than the distance between the second projection and the third projection.

[0228] For example, as shown in FIG22A , when the first shell 1 and the second shell 2 are relatively unfolded to an open state, the support surface of the rotating arm 321 can be flush with the third support surface 12 of the first shell 1 and the support surface 314 of the main shaft 31, thereby jointly providing a flat support environment for the flexible display 20. The support surface of the rotating arm 321 can be shown in FIG11B , and can include a support surface 321k of the second end 3212 of the rotating arm 321, a support surface 321j of the arc-shaped arm 321c, a support surface 321h of the connecting rod 321b, and a support surface 321f of the connecting gear 321a. In other embodiments, a portion or the entire support surface of the rotating arm 321 may not be flush with the third support surface 12 of the first shell 1 and the support surface 314 of the main shaft 31. For example, the support surface may be slightly lower so as not to lift up the flexible display 20 while still providing a certain amount of structural support.

[0229] Referring again to Figures 19 and 21 , since the damping assembly 328 is connected to the synchronization assembly 327 and the first end 3231 of the first connecting arm 323, the synchronization assembly 327 is connected to the first end 3211 of the rotating arm 321, the second end 3212 of the rotating arm 321 is fixed to the first housing 1, and the second end 3232 of the first connecting arm 323 is connected to the second housing 2 via the fixing bracket 322, the damping assembly 328 can provide a damping force during the relative expansion or folding of the first housing 1 and the second housing 2, allowing the user to sense resistance and thrust when expanding or folding the electronic device 100, thereby providing a better opening and closing experience and improving the mechanical operation experience of the electronic device 100. In addition, in some embodiments, the damping assembly 328 can also cause the rotating arm 321 and the first connecting arm 323 to remain in certain positions, thereby allowing the first housing 1 and the second housing 2 to remain in certain positions, thereby improving the user's usage experience.

[0230] In other embodiments, as long as the pivot arm 321 satisfies the connection relationship with the main shaft 31, the synchronization assembly 327, and the damping assembly 328, the pivot arm 321 may not be provided with the connecting rod 321b, and the connecting gear 321a may be directly fixedly connected to the curved arm 321c. In this case, a second curved surface 321i may be provided on the connecting gear 321a, with the second curved surface 321i facing away from the support surface 321f of the connecting gear 321a. The second curved surface 321i may be located on one side or in the middle of the tooth portion 321e of the connecting gear 321a. The specific structure of the pivot arm 321 is not strictly limited in this embodiment of the present application.

[0231] Please refer to FIG. 27 , which is a schematic structural diagram of the support plate 35 shown in FIG. 5 at another angle.

[0232] In some embodiments, the support plate 35 may include a plate body 352 and a plurality of connector groups, wherein the plurality of connector groups are fixed to the same side panel surface protruding from the plate body 352 and arranged along the extension direction of the plate body 352. The number of connector groups corresponds to the number of connector components (32, 33, 34) of the folding assembly 3. The connector groups may include a first rotating block 353, a second rotating block 354, and a sliding block 355. The first rotating block 353 includes an arcuate arm, and the second rotating block 354 includes an arcuate arm. The centers of the arcuate arms of the first rotating block 353 and the second rotating block 354 coincide with each other. The sliding block 355 is provided with a sliding groove 3551. Among them, the arc-shaped arm of the first rotating block 353 is fixed to the non-support surface of the plate body 352, and the non-support surface of the plate body 352 is arranged opposite to the support surface of the plate body 352. The support surface of the plate body 352 is used to support the flexible display screen 20 when the first shell 1 and the second shell 2 are relatively unfolded to the open state, that is, the support surface of the support plate 35. Therefore, the arc-shaped arm of the first rotating block 353 is fixed to the side of the plate body 352 facing away from the flexible display screen 20.

[0233] The support plate 35 may further be provided with a plurality of compensation blocks 356 , which are protruded from the side of the plate body 352 , and the number of compensation blocks 356 corresponds to the number of connecting components ( 32 , 33 , 34 ) of the folding component 3 .

[0234] The plate body 352 may be provided with a plurality of avoidance notches 357 , which run through the thickness direction of the plate body 352 , and the number of the avoidance notches 357 corresponds to the number of the connecting components ( 32 , 33 , 34 ) of the folding component 3 .

[0235] Please refer to Figures 28 to 30B. Figure 28 is a schematic structural diagram of the folding device 10 shown in Figure 3 at another angle, Figure 29A is a schematic cross-sectional structural diagram of the folding device 10 shown in Figure 28 taken along HH, Figure 29B is a schematic cross-sectional structural diagram of the structure shown in Figure 29A in another usage state, Figure 30A is a schematic cross-sectional structural diagram of the folding device 10 shown in Figure 28 taken along II, and Figure 30B is a schematic cross-sectional structural diagram of the structure shown in Figure 30A in another usage state.

[0236] In some embodiments, as shown in Figure 28, when the first shell 1 and the second shell 2 are in the open state, the support plate 35 is located between the main shaft 31 and the second shell 2, and the support plate 35 blocks the gap between the main shaft 31 and the second shell 2. The first shell 1, the main shaft 31, the support plate 35 and the second shell 2 can be used to jointly support the flexible display screen 20 (see Figure 3).

[0237] The compensation block 356 of the support plate 35 can be at least partially located in the second notch 319 (see FIG. 7 ) of the main shaft 31 to increase the support area of ​​the support plate 35. The second end 3242 of the second connecting arm 324 can be at least partially located in the avoidance notch 357 of the support plate 35, allowing the second end 3242 of the second connecting arm 324 to have sufficient room for movement and to compensate for the support area of ​​the support plate 35, thereby increasing support for the flexible display 20.

[0238] 29A and 29B , the first rotation block 353 of the support plate 35 is mounted in the first rotation slot 3224 of the fixing frame 322, so that the support plate 35 is rotatably connected to the fixing frame 322. The second rotation block 354 (see FIG. 27 ) of the support plate 35 can be correspondingly mounted in the second rotation slot 3225 (see FIG. 20 ) of the fixing frame 322, thereby making the rotational connection between the support plate 35 and the fixing frame 322 more stable and reliable.

[0239] 30A and 30B , the sliding block 355 of the support plate 35 is at least partially located in the avoidance space 324b of the second connecting arm 324. The connecting shaft 326, which is inserted into the second connecting arm 324, is inserted into the sliding groove 3551 of the sliding block 355 and is capable of sliding in the sliding groove 3551. The support plate 35 is slidably connected to the second connecting arm 324. The extending direction of the sliding groove 3551 of the sliding block 355 of the support plate 35 can be a straight line, an arc, a spline curve, etc., which is not strictly limited in the embodiments of the present application.

[0240] In this embodiment, since the support plate 35 is rotatably connected to the fixed frame 322 and slidably connected to the second connecting arm 324, during the relative movement of the first shell 1 and the second shell 2, the support plate 35 moves under the drive of the fixed frame 322 and the second connecting arm 324, and the movement path is accurate to meet the support requirements of the folding device 10 for the flexible display screen 20 in different forms.

[0241] As shown in Figures 29A and 29B , the first surface 322a of the fixing frame 322 is positioned toward the support plate 35. Since the flexible display 20 is positioned above the support plate 35, the first surface 322a of the fixing frame 322 is positioned between the flexible display 20 and the second surface 322b of the fixing frame 322. Furthermore, the third surface 322c of the fixing frame 322 is positioned between the main shaft 31 and the fourth surface 322d of the fixing frame 322.

[0242] Illustratively, when the first shell 1 and the second shell 2 are relatively unfolded to an open state, a first angle is formed between the first surface 322a and the support plate 35, and the distance between the end of the first surface 322a closer to the main shaft 31 and the support plate 35 is greater than the distance between the end of the first surface 322a farther from the main shaft 31 and the support plate 35; that is, the opening of the first angle is arranged toward the main shaft 31. When the first shell 1 and the second shell 2 are relatively folded to a closed state, the support plate 35 rotates relative to the fixing frame 322 and approaches the first surface 322a, forming a second angle between the first surface 322a and the support plate 35, the second angle being smaller than the first angle. In some embodiments, when the first shell 1 and the second shell 2 are relatively folded to a closed state, the first surface 322a may contact the support plate 35 to provide support for the support plate 35.

[0243] 29A and 29B , the arcuate arm of the first rotating block 353 of the support plate 35 extends from the plate body 352 in a direction away from the main shaft 31. When the first housing 1 and the second housing 2 are relatively unfolded, a portion of the arcuate arm of the first rotating block 353 rotates out of the first rotating groove 3224. When the first housing 1 and the second housing 2 are relatively folded, a portion of the arcuate arm of the first rotating block 353 rotates into the first rotating groove 3224.

[0244] Please refer to FIG. 31A , which is a schematic diagram of the internal structure of the electronic device 100 shown in FIG. 2 .

[0245] In some embodiments, when the first housing 1 and the second housing 2 are folded relative to each other to a closed state, the first portion 201 of the flexible display 20 is disposed opposite the second portion 202 of the flexible display 20, and the middle portion of the third portion 203 of the flexible display 20 is offset toward the second housing 2. In this embodiment, as the receiving space 30 is offset toward the second housing 2, the flexible display 20 deforms along with the receiving space 30, and the third portion 203 of the flexible display 20 deviates toward the second housing 2. Compared to the symmetrical deformation of conventional flexible displays 20, the third portion 203 of the flexible display 20 of this application has fewer bends, thereby reducing the risk of damage to the flexible display 20, improving the reliability of the flexible display 20, and extending the service life of the flexible display 20.

[0246] Exemplarily, the support plate 35 includes a first end 35a close to the main axis 31 and a second end 35b away from the main axis 31. When the first shell 1 and the second shell 2 are folded relative to each other to a closed state, the distance between the first end 35a of the support plate 35 and the first shell 1 is greater than the distance between the second end 35b of the support plate 35 and the first shell 1, so as to form a receiving space 30 between the support plate 35 and the first shell 1. The receiving space 30 is a space that is narrow at the top and wide at the bottom, and is biased toward the second shell 2. The third part 203 of the flexible display screen 20 is at least partially received in the receiving space 30.

[0247] For example, as shown in FIG31A , the third portion 203 of the flexible display 20 includes a first segment 2031, a second segment 2032, a third segment 2033, and a fourth segment 2034, which are sequentially connected. The first segment 2031 connects to the first portion 201 of the flexible display 20, and the fourth segment 2034 connects to the second portion 202 of the flexible display 20. When the first housing 1 and the second housing 2 are folded relative to each other into a closed state, the second segment 2032 and the fourth segment 2034 are curved segments, and the second segment 2032 and the third segment 2033 are offset toward the second housing 2. The flexible display 20 is bent between the second segment 2032 and the fourth segment 2034. The middle of the third portion 203 of the flexible display 20 can be approximately located in the third segment 2033. When the first housing 1 and the second housing 2 are folded relative to each other into a closed state, the first segment 2031 and the third segment 2033 can be straight segments.

[0248] Please refer to FIG. 31A and FIG. 31B in combination. FIG. 31B is a structural diagram of a fixing scheme of the flexible display screen 20 and the folding device 10 of the electronic device 100 shown in FIG. 1 in some embodiments.

[0249] In some embodiments, the first section 2031 of the third portion 203 of the flexible display 20 is positioned corresponding to the third support surface 12 of the first housing 1 and the second ends 3212 of the pivoting arms 321 of the plurality of connecting components. The third support surface 12 of the first housing 1 can be flat or approximately flat to provide a smooth support environment for the first section 2031 of the third portion 203 of the flexible display 20. The third section 2033 of the third portion 203 of the flexible display 20 is positioned corresponding to the support plate 35. The support surface 351 of the support plate 35 can be flat or approximately flat to provide a smooth support environment for the third section 2033 of the third portion 203 of the flexible display 20. The second section 2032 of the third portion 203 of the flexible display 20 is positioned near the main axis 31, forming one of the bending positions of the third portion 203 of the flexible display 20. The fourth section 2034 of the third portion 203 of the flexible display screen 20 is provided corresponding to the connection between the support plate 35 and the second shell 2 , forming another bending position of the third portion 203 of the flexible display screen 20 .

[0250] In this embodiment, when the electronic device 100 is in the closed state, the flexible display screen 20 forms two bending positions at its third portion 203 . The flexible display screen 20 has fewer bending positions, which is beneficial to improving the reliability of the flexible display screen 20 .

[0251] Referring to FIG. 31B , in some embodiments, the electronic device 100 may further include an adhesive layer assembly 40, which may include first to fourth adhesive layers (401 to 404). The first adhesive layer 401 may be fixed to the first supporting surface 11 of the first housing 1 and may also be fixedly connected to the first portion 201 of the flexible display 20. The second adhesive layer 402 may be fixed to the second supporting surface 21 of the second housing 2 and may also be fixedly connected to the second portion 202 of the flexible display 20. The third adhesive layer 403 may be fixed to the third supporting surface 12 of the first housing 1 and may also be fixedly connected to the first segment 2031 of the third portion 203 of the flexible display 20. The fourth adhesive layer 404 may be fixed to the supporting surface 351 of the support plate 35 and may also be fixedly connected to the third segment 2033 of the third portion 203 of the flexible display 20. No adhesive layer is provided on the support surface 314 of the main shaft 31, and the main shaft 31 is not fixed to the second section 2032 of the third portion 203 of the flexible display 20. No adhesive layer is provided at the intersection of the support plate 35 and the second housing 2, and this intersection is not fixed to the fourth section 2034 of the third portion 203 of the flexible display 20.

[0252] In this embodiment, the first section 2031 of the flexible display screen 20 is fixedly connected to the first shell 1, the second section 2032 of the flexible display screen 20 is not fixed to the main axis 31, and the third section 2033 of the flexible display screen 20 is fixedly connected to the support plate 35, so that the flexible display screen 20 can be bent into a desired shape during the process of switching the electronic device 100 from the unfolded state to the closed state, thereby reducing the risk of the flexible display screen 20 arching and improving the reliability and service life of the flexible display screen 20.

[0253] In some other embodiments, the adhesive layer assembly 40 may not be provided with the fourth adhesive layer 404, and the third section 2033 of the third portion 203 of the flexible display screen 20 and the supporting surface 351 of the supporting plate 35 may not be bonded and fixed, and the two may move relatively.

[0254] In the above embodiment, each adhesive layer of the adhesive layer assembly 40 can be a continuous adhesive layer, a disconnected adhesive layer, or an adhesive layer with hollowed-out areas. For example, it can be a whole surface / net-shaped adhesive layer, or include multiple adhesive blocks / dots, or include multiple adhesive strips, etc., and this embodiment of the present application is not strictly limited to this. Different adhesive layers can have the same or different hardness, and this embodiment of the present application is not strictly limited to this.

[0255] Please refer to FIG. 31B and FIG. 32 in combination. FIG. 32 is a schematic diagram of the exploded structure of the flexible display screen 20 shown in FIG. 31B .

[0256] In some embodiments, the flexible display screen 20 may include a flexible display panel 20a and a carrier plate 20b. The carrier plate 20b is fixed to the non-display side of the flexible display panel 20a. The display side of the flexible display panel 20a is used to emit light to achieve display. The carrier plate 20b has a greater rigidity than the flexible display panel 20a. The carrier plate 20b is used to provide rigid support for the flexible display panel 20a and is bendable to increase the support strength of the flexible display screen 20.

[0257] The support plate 20b is made of a material having a certain strength, hardness, and rigidity, and capable of bending under external force. For example, the support plate 20b can be made of stainless steel, aluminum alloy, magnesium alloy, titanium alloy, copper alloy, or the like. Alternatively, the support plate 20b can be made of a metal-based composite material, such as a particle-reinforced aluminum-based or magnesium-based composite material such as silicon carbide, aluminum oxide, boron carbide, carbon nanotubes, graphene, chromium carbide, silicon boride, titanium boride, or titanium carbide.

[0258] For example, the supporting plate 20b includes a first plate portion 20b-1 located in the first section 2031, a second plate portion 20b-2 located in the second section 2032, a third plate portion 20b-3 located in the third section 2033, and a fourth plate portion 20b-4 located in the fourth section 2034. The first plate portion 20b-1 and the third plate portion 20b-3 have greater rigidity than the second plate portion 20b-2 and the fourth plate portion 20b-4. In this case, the second plate portion 20b-2 and the fourth plate portion 20b-4 have weaker rigidity and can bend more easily while supporting the flexible display panel 20a.

[0259] For example, the supporting plate 20b may further include a fifth plate portion 20b-5 located in the first portion 201 and a sixth plate portion 20b-6 located in the second portion 202. The strength of the fifth plate portion 20b-5 and the sixth plate portion 20b-6 may be the same as or similar to that of the first plate portion 20b-1.

[0260] The support plate 20b can be an integrally formed structure, with the multiple plate portions of the support plate 20b interconnected and each being part of the support plate 20b, thereby enhancing the connection strength between the multiple plate portions. The multiple plate portions are exemplarily distinguished by dashed lines in the drawings of this application. In other embodiments, the multiple plate portions of the support plate 20b can also be connected and fixed to each other by welding or clamping.

[0261] In some embodiments, the first plate portion 20b-1 and the third plate portion 20b-3 can adopt the same or similar design, for example, they can both be complete plate structures. For example, the second plate portion 20b-2 and the fourth plate portion 20b-4 can reduce the rigidity by providing through holes, grooves, thinning the thickness, splicing soft plastic parts, etc., so as to obtain better bending performance and tensile properties. For example, the second plate portion 20b-2 can be provided with at least one groove or at least one through hole, or the thickness of the second plate portion 20b-2 can be less than the thickness of the first plate portion 20b-1, or the second plate portion 20b-2 can adopt a splicing structure of metal plates and soft plastic parts, etc. This application does not strictly limit the specific material and structure of the second plate portion 20b-2. For example, the fourth plate portion 20b-4 may be provided with at least one groove or at least one through hole, or the thickness of the fourth plate portion 20b-4 may be smaller than the thickness of the first plate portion 20b-1, or the fourth plate portion 20b-4 may adopt a splicing structure of metal plates and soft rubber parts, etc. This application does not strictly limit the specific material and structure of the fourth plate portion 20b-4.

[0262] When the second plate portion 20b-2 and the fourth plate portion 20b-4 are provided with a plurality of grooves or through holes, the grooves or through holes may be arranged spaced apart from each other from the top to the bottom of the plate portion. The shapes of the grooves or through holes may be diamond, square, dumbbell, or round, and are not strictly limited in this application.

[0263] Please refer to FIG. 33 , which is a schematic diagram of the simplified structure of a portion of the folding assembly 3 shown in FIG. 4 in other embodiments.

[0264] In the above embodiment, the support plate 35 of the folding assembly 3 is slidably connected to the second connecting arm 324 (see Figure 30A). In other embodiments, as shown in Figure 33, the above connection relationship can be replaced by: the support plate 35 of the folding assembly 3 is slidably connected to the second end 3232 of the first connecting arm 323. Among them, the extension direction of the sliding groove 3551 of the sliding block 355 of the support plate 35 can be a straight line, an arc shape, a spline curve shape, etc. At this time, the first end 3231 of the first connecting arm 323 is still rotationally connected to the main shaft 31. Among them, in order to achieve a sliding connection with the support plate 35, the first connecting arm 323 can refer to the structure of the second connecting arm 324 in the above embodiment for adaptive adjustment, which will not be repeated here. Other structures of the folding assembly 3 in this embodiment can also refer to the above embodiment, which will not be repeated here.

[0265] Please refer to Figures 34A to 34C, Figure 34A is a schematic diagram of the motion mechanism of the partial structure of the folding component 3 shown in Figure 4 in other embodiments, Figure 34B is a brief structural schematic diagram of the partial structure of the motion mechanism shown in Figure 34A in some implementations, and Figure 34C is a brief structural schematic diagram of the partial structure of the motion mechanism shown in Figure 34A in other implementations.

[0266] In the aforementioned embodiment, as shown in FIG25 , the first connecting arm 323 of the folding assembly 3 is rotatably connected to the main shaft 31 and slidably connected to the fixed frame 322; the second connecting arm 324 is rotatably connected to the main shaft 31 and slidably connected to the fixed frame 322. In other embodiments, as shown in FIG34A , the above connection relationship can be changed to: the first connecting arm 323 of the folding assembly 3 is rotatably connected to the main shaft 31 and slidably connected to the fixed frame 322; the second connecting arm 324 is rotatably connected to the main shaft 31 and rotatably connected to the fixed frame 322. Specifically, as shown in FIG34B , the first end 3241 of the second connecting arm 324 can be rotatably connected to the main shaft 31 via a virtual axis connection, and the second end 3242 of the second connecting arm 324 can be rotatably connected to the fixed frame 322 via a virtual axis connection. As shown in FIG34C , the first end 3241 of the second connecting arm 324 can be rotatably connected to the main shaft 31 via a virtual axis connection, and the second end 3242 of the second connecting arm 324 can be rotatably connected to the fixed frame 322 via a physical axis connection. In some other embodiments, the first end 3241 of the second connecting arm 324 can also be rotatably connected to the main shaft 31 through a physical shaft connection. Other structures of the folding assembly 3 in this embodiment can also refer to the previous embodiments and will not be repeated here.

[0267] It will be appreciated that the preceding embodiments illustrate an electronic device 100 having a two-fold structure, i.e., the electronic device 100 includes two housings that can bend relative to each other. In other embodiments, the electronic device 100 may also have a three-fold or more-fold structure, i.e., the electronic device 100 may include three or more housings that bend relative to each other, with any two adjacent housings connected by a folding assembly 3. When the electronic device 100 has a three-fold or more-fold structure, the structure of the electronic device 100 may be adaptively designed with reference to the description of the two structures in this embodiment.

[0268] Please refer to Figure 35, which is a structural diagram of the electronic device 100 provided in some other embodiments of the embodiment of the present application.

[0269] In some embodiments, the electronic device 100 can be a three-fold structure. The folding device 10 of the electronic device 100 includes a first shell 1, a folding assembly 3, a second shell 2, a third shell 4, and a second folding assembly 5. Among them, the first shell 1, the folding assembly 3, and the second shell 2 can adopt the structures described in the previous embodiments, which will not be repeated here. The second folding assembly 5 is connected to the side of the first shell 1 away from the second shell 2, and the second folding assembly 5 is also connected to the third shell 4. That is, the first shell 1, the folding assembly 3, the second shell 2, the third shell 4, and the second folding assembly 5 of the electronic device 100 are connected in sequence.

[0270] When the electronic device 100 is in the closed state, the third housing 4, the first housing 1, and the second housing 2 are folded into an S-shape, with the first housing 1 located between the third housing 4 and the second housing 2. When the electronic device 100 is in the fully opened state, the first housing 1, the second housing 2, and the third housing 4 are flattened. The electronic device 100 can also have a partially opened state, in which the first housing 1 and the second housing 2 are relatively unfolded to the opened state, and the first housing 1 and the third housing 4 are relatively folded to the closed state.

[0271] For example, the first shell 1 , the second shell 2 and the third shell 4 may be designed with equal thickness or with unequal thickness. For example, the thickness of the first shell 1 may be smaller than that of the second shell 2 or the third shell 4 .

[0272] Exemplarily, the flexible display 20 includes a first portion 201, a second portion 202, a third portion 203, a fourth portion 204, and a fifth portion 205. The first portion 201 to the third portion 203 of the flexible display 20 can employ the structures described in the previous embodiments and are not further described here. The fourth portion 204 of the flexible display 20 is connected to the side of the third portion 203 of the flexible display 20 away from the second portion 202. The fourth portion 204 of the flexible display 20 is also connected to the fifth portion 205 of the flexible display 20. In other words, the first portion 201 to the fifth portion 205 of the flexible display 20 are connected in sequence.

[0273] The fourth portion 204 of the flexible display 20 is positioned corresponding to the second folding assembly 5, and the fifth portion 205 of the flexible display 20 is positioned corresponding to the third housing 4. The portion of the flexible display 20 corresponding to the third housing 4 is fixed to the third housing 4. During the relative unfolding or folding of the first housing 1 and the third housing 4, the portion of the flexible display 20 corresponding to the second folding assembly 5 deforms. When the electronic device 100 is in the closed state, the first to third portions 201 to 203 of the flexible display 20 are concealed by the folding device 10, leaving the fourth and fifth portions 204 and 205 of the flexible display 20 exposed, enabling display and / or touch operations. When the electronic device 100 is in the open state, the flexible display 20 is fully flattened, enabling full-screen display and / or touch operations. The electronic device 100 may also include a partially open state, in which the flexible display 20 changes shape with the folding device 10.

[0274] When the electronic device 100 is in the open state, the flexible display 20 is located on the same side of the first housing 1, the second housing 2, and the third housing 4, and the first housing 1, the second housing 2, and the third housing 4 jointly support the flexible display 20. When the electronic device 100 is in the closed state, in the direction from the third housing 4 to the second housing 2, the portion of the flexible display 20 corresponding to the third housing 4, the third housing 4, the first housing 1, the portion of the flexible display 20 corresponding to the first housing 1, the portion of the flexible display 20 corresponding to the second housing 2, and the second housing 2 are stacked in sequence.

[0275] The above embodiments are only used to illustrate part of the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electronic device (100), characterized in that It comprises a folding device (10) and a flexible display screen (20); The folding device (10) comprises a first shell (1), a second shell (2) and a folding assembly (3), wherein the folding assembly (3) connects the first shell (1) and the second shell (2); The flexible display screen (20) and the corresponding portion of the first shell (1) are fixed to the first shell (1), and the corresponding portion of the flexible display screen (20) and the second shell (2) are fixed to the second shell (2), and during the process of relative expansion or relative folding of the first shell (1) and the second shell (2), the corresponding portion of the flexible display screen (20) and the folding assembly (3) are deformed; The folding assembly (3) comprises a main shaft (31), a fixing frame (322), a rotating arm (321), a first connecting arm (323) and a second connecting arm (324); The first end (3211) of the rotating arm (321) is rotatably connected to the main shaft (31), and the second end (3212) of the rotating arm (321) is fixedly connected to the first shell (1); The fixing frame (322) is fixedly connected to the second shell (2); The first end (3231) of the first connecting arm (323) is rotatably connected to the main shaft (31), and the second end (3232) of the first connecting arm (323) is slidably connected to the fixing frame (322); The first end (3241) of the second connecting arm (324) is rotatably connected to the main shaft (31), the rotation center of the first end (3241) of the second connecting arm (324) does not coincide with the rotation center of the first end (3231) of the first connecting arm (323), and the second end (3242) of the second connecting arm (324) is slidably connected or rotatably connected to the fixed frame (322).

2. The electronic device (100) according to claim 1, characterized in that The folding assembly (3) further comprises a synchronization assembly (327), wherein the synchronization assembly (327) engages with the first end (3211) of the rotating arm (321) and engages with the first end (3231) of the first connecting arm (323).

3. The electronic device (100) according to claim 2, characterized in that The first end (3211) of the rotating arm (321) includes a connecting gear (321a), and the synchronization component (327) includes a first synchronization gear (3271) and a second synchronization gear (3272). The first synchronization gear (3271) engages with the connecting gear (321a). In the thickness direction of the main shaft (31), the first synchronization gear (3271) is located on the side of the connecting gear (321a) facing away from the flexible display screen (20), and the second synchronization gear (3272) engages with the first synchronization gear (3271) and the first end (3231) of the first connecting arm (323).

4. The electronic device (100) according to claim 3, characterized in that The connecting gear (321a) is an incomplete gear, and the connecting gear (321a) includes a supporting surface (321f) and a tooth portion (321e) disposed opposite to each other; When the first housing (1) and the second housing (2) are relatively unfolded to an open state, the tooth portion (321e) of the connecting gear (321a) faces the first synchronous gear (3271) and is located inside the main shaft (31), and the supporting surface (321f) of the connecting gear (321a) is flush with the supporting surface (314) of the main shaft (31); When the first shell (1) and the second shell (2) are folded relative to each other to a closed state, the connecting gear (321a) rotates relative to the main shaft (31), the tooth portion (321e) of the connecting gear (321a) partially rotates out of the main shaft (31), and the supporting surface (321f) of the connecting gear (321a) faces the flexible display screen (20).

5. The electronic device (100) according to claim 4, characterized in that In the width direction of the main shaft (31), the rotation center of the first synchronous gear (3271) is away from the rotation center of the second synchronous gear (3272) relative to the rotation center of the connecting gear (321a), and the width direction of the main shaft (31) is perpendicular to the thickness direction of the main shaft (31) and perpendicular to the extension direction of the main shaft (31).

6. The electronic device (100) according to any one of claims 3 to 5, characterized in that The first end (3211) of the rotating arm (321) further includes an arc-shaped arm (321c), wherein the arc-shaped arm (321c) is fixed to one side of the connecting gear (321a), and the central axis of the arc-shaped arm (321c) is colinear with the central axis of the connecting gear (321a), and the arc-shaped arm (321c) is installed in the arc-shaped groove of the main shaft (31) to rotatably connect to the main shaft (31).

7. The electronic device (100) according to any one of claims 1 to 6, characterized in that The rotation center of the first end (3241) of the second connecting arm (324) is closer to the flexible display screen (20) than the rotation center of the first end (3231) of the first connecting arm (323).

8. The electronic device (100) according to any one of claims 1 to 7, characterized in that When the second end (3242) of the second connecting arm (324) is slidably connected to the fixing frame (322), the direction in which the second end (3242) of the second connecting arm (324) slides relative to the fixing frame (322) is not parallel to the direction in which the second end (3232) of the first connecting arm (323) slides relative to the fixing frame (322).

9. The electronic device (100) according to claim 8, characterized in that The fixing frame (322) has a first surface (322a), a second surface (322b), a third surface (322c) and a fourth surface (322d), wherein the first surface (322a) and the second surface (322b) are disposed opposite to each other, and the first surface (322a) is located between the flexible display screen (20) and the second surface (322b), and the third surface (322c) and the fourth surface (322d) are disposed opposite to each other, and the third surface (322c) is located between the main shaft (31) and the fourth surface (322d); The fixing frame (322) includes a first slide groove (3221) and a second slide groove (3222), the extension direction of the second slide groove (3222) is not parallel to the extension direction of the first slide groove (3221), the openings at both ends of the first slide groove (3221) are respectively located on the first surface (322a) and the second surface (322b), and the openings at both ends of the second slide groove (3222) are respectively located on the third surface (322c) and the fourth surface (322d); The slider at the second end (3232) of the first connecting arm (323) is installed in the first sliding groove (3221) and is capable of sliding relative to the fixing frame (322) along the extension direction of the first sliding groove (3221); The slider at the second end (3242) of the second connecting arm (324) is installed in the second sliding groove (3222) and can slide relative to the fixing frame (322) along the extension direction of the second sliding groove (3222).

10. The electronic device (100) according to claim 8 or 9, characterized in that The folding assembly (3) further comprises a connecting rod (325), one end of which is rotatably connected to the first connecting arm (323), and the other end of which is rotatably connected to the second connecting arm (324).

11. The electronic device (100) according to any one of claims 1 to 8, characterized in that The folding assembly (3) further comprises a support plate (35), wherein the support plate (35) is connected to the fixing frame (322), and the support plate (35) is also connected to the first connecting arm (323) or the second connecting arm (324); When the first shell (1) and the second shell (2) are relatively unfolded to an open state, the first shell (1), the main shaft (31), the support plate (35) and the second shell (2) jointly support the flexible display screen (20); The support plate (35) includes a first end (35a) close to the main axis (31) and a second end (35b) away from the main axis (31). When the first shell (1) and the second shell (2) are folded relative to each other to a closed state, the distance between the first end (35a) of the support plate (35) and the first shell (1) is greater than the distance between the second end (35b) of the support plate (35) and the first shell (1), so as to form a receiving space (30) between the support plate (35) and the first shell (1), and the flexible display screen (20) is at least partially received in the receiving space (30).

12. The electronic device (100) according to claim 11, characterized in that The fixing frame (322) has a first surface (322a), and the first surface (322a) is arranged toward the supporting plate (35); When the first shell (1) and the second shell (2) are relatively unfolded to an open state, a first angle is formed between the first surface (322a) and the support plate (35), and the distance between the end of the first surface (322a) close to the main shaft (31) and the support plate (35) is greater than the distance between the end of the first surface (322a) away from the main shaft (31) and the support plate (35); When the first shell (1) and the second shell (2) are folded relative to each other to a closed state, the support plate (35) rotates relative to the fixing frame (322) and approaches the first surface (322a), and a second angle is formed between the first surface (322a) and the support plate (35), and the second angle is smaller than the first angle.

13. The electronic device (100) according to claim 12, characterized in that The fixing frame (322) further has a first rotation groove (3224), which is an arc-shaped groove and extends from the first surface (322a) to the inside of the fixing frame (322); The support plate (35) comprises a plate body (352) and a first rotating block (353); the plate body (352) is used to support the flexible display screen (20) when the first shell (1) and the second shell (2) are relatively unfolded to an open state; the first rotating block (353) is fixed to a side of the plate body (352) facing away from the flexible display screen (20); and an arc-shaped arm of the first rotating block (353) extends from the plate body (352) in a direction away from the main axis (31); The arc-shaped arm of the first rotating block (353) is installed in the first rotating groove (3224). During the relative expansion of the first shell (1) and the second shell (2), a part of the arc-shaped arm of the first rotating block (353) rotates out of the first rotating groove (3224). During the relative folding of the first shell (1) and the second shell (2), a part of the arc-shaped arm of the first rotating block (353) rotates into the first rotating groove (3224).

14. The electronic device (100) according to claim 11, characterized in that The flexible display screen (20) comprises a first part (201), a second part (202) and a third part (203), wherein the third part (203) is connected between the first part (201) and the second part (202), the first part (201) is fixed to the first housing (1), and the second part (202) is fixed to the second housing (2); When the first shell (1) and the second shell (2) are folded relative to each other to a closed state, the third part (203) is at least partially accommodated in the accommodation space (30), and the middle part of the third part (203) is offset in a direction close to the second shell (2).

15. The electronic device (100) according to claim 14, characterized in that The third portion (203) includes a first section (2031), a second section (2032), a third section (2033), and a fourth section (2034) connected in sequence, wherein the first section (2031) is connected to the first portion (201), and the fourth section (2034) is connected to the second portion (202); When the first shell (1) and the second shell (2) are folded relative to each other to a closed state, the second section (2032) and the fourth section (2034) are curved sections, and the second section (2032) and the third section (2033) are offset in a direction close to the second shell (2).

16. The electronic device (100) according to claim 15, characterized in that The flexible display screen (20) comprises a flexible display panel (20a) and a carrier plate (20b), wherein the carrier plate (20b) is fixed to the non-display side of the flexible display panel (20a), and the rigidity of the carrier plate (20b) is greater than the rigidity of the flexible display panel (20a); The supporting plate (20b) includes a first plate portion (20b-1) located in the first section (2031), a second plate portion (20b-2) located in the second section (2032), a third plate portion (20b-3) located in the third section (2033), and a fourth plate portion (20b-4) located in the fourth section (2034), wherein the stiffness of the first plate portion (20b-1) and the third plate portion (20b-3) is greater than the stiffness of the second plate portion (20b-2) and the fourth plate portion (20b-4).

17. The electronic device (100) according to claim 16, characterized in that The second plate portion (20b-2) is provided with at least one groove or at least one through hole; Alternatively, the thickness of the second plate portion (20b-2) is smaller than the thickness of the first plate portion (20b-1).

18. The electronic device (100) according to any one of claims 15 to 17, characterized in that The first section (2031) is fixedly connected to the first shell (1), the second section (2032) is not fixed to the main shaft (31), and the third section (2033) is fixedly connected to the support plate (35).

19. The electronic device (100) according to any one of claims 1 to 18, characterized in that The main shaft (31) includes an outer surface (3140) facing away from the flexible display screen (20); When the first shell (1) and the second shell (2) are relatively unfolded to an open state, the first shell (1) and the second shell (2) are spliced ​​together and jointly shield the outer surface (3140) of the main shaft (31); When the first shell (1) and the second shell (2) are folded relative to each other to a closed state, a portion of the outer surface (3140) of the main shaft (31) is exposed relative to the first shell (1) and the second shell (2), and the two side edges of the outer surface (3140) of the main shaft (31) are shielded by the first shell (1) and the second shell (2).

20. The electronic device (100) according to claim 19, characterized in that The first housing (1) includes a first end surface (13) close to the main shaft (31), and the second housing (2) includes a second end surface (23) close to the main shaft (31); When the first shell (1) and the second shell (2) are relatively unfolded to an open state, the first end surface (13) faces the second end surface (23); When the first shell (1) and the second shell (2) are folded relative to each other to a closed state, the first end face (13) and the second end face (23) are oriented in the same direction, and in the thickness direction of the main shaft (31), the distance between the first end face (13) and the outer surface (3140) of the main shaft (31) is greater than the distance between the second end face (23) and the outer surface (3140) of the main shaft (31).

21. The electronic device (100) according to any one of claims 1 to 20, characterized in that The electronic device (100) further comprises a third housing (4) and a second folding assembly (5), wherein the second folding assembly (5) is connected to a side of the first housing (1) away from the second housing (2), and the second folding assembly (5) is further connected to the third housing (4); when the electronic device (100) is in a closed state, the first housing (1) is located between the third housing (4) and the second housing (2); The portion of the flexible display screen (20) corresponding to the third shell (4) is fixed to the third shell (4), and during the relative unfolding or folding of the first shell (1) and the third shell (4), the portion of the flexible display screen (20) corresponding to the second folding assembly (5) is deformed; When the electronic device (100) is in an open state, the flexible display screen (20) is located on the same side of the first shell (1), the second shell (2), and the third shell (4), and the first shell (1), the second shell (2), and the third shell (4) jointly support the flexible display screen (20); When the electronic device (100) is in a closed state, in the direction from the third shell (4) to the second shell (2), the portion of the flexible display screen (20) corresponding to the third shell (4), the third shell (4), the first shell (1), the portion of the flexible display screen (20) corresponding to the first shell (1), the portion of the flexible display screen (20) corresponding to the second shell (2), and the second shell (2) are stacked and arranged in sequence.

22. A folding assembly (3), characterized in that: The folding assembly (3) is applied to a foldable electronic device (100), and is used to connect a first housing (1) and a second housing (2) of the electronic device (100) to jointly support a flexible display screen (20) of the electronic device (100); The folding assembly (3) comprises a main shaft (31), a fixing frame (322), a rotating arm (321), a first connecting arm (323) and a second connecting arm (324). arm (324); The first end (3211) of the rotating arm (321) is rotatably connected to the main shaft (31), and the second end (3212) of the rotating arm (321) is fixedly connected to the first shell (1); The fixing frame (322) is used for fixedly connecting to the second shell (2); The first end (3231) of the first connecting arm (323) is rotatably connected to the main shaft (31) around the first axis, and the second end (3232) of the first connecting arm (323) is slidably connected to the fixing frame (322); The first end (3241) of the second connecting arm (324) is rotatably connected to the main shaft (31) around a second axis, and the second end (3242) of the second connecting arm (324) is slidably connected or rotatably connected to the fixing frame (322), and the second axis does not coincide with the first axis.

23. The folding assembly (3) according to claim 22, characterized in that The folding assembly (3) further comprises a synchronization assembly (327), wherein the synchronization assembly (327) engages with the first end (3211) of the rotating arm (321) and engages with the first end (3231) of the first connecting arm (323).

24. The folding assembly (3) according to claim 23, characterized in that The first end (3211) of the rotating arm (321) includes a connecting gear (321a), and the synchronous assembly (327) includes a first synchronous gear (3271) and a second synchronous gear (3272). The first synchronous gear (3271) engages with the connecting gear (321a). In the thickness direction of the main shaft (31), the first synchronous gear (3271) is located on the side of the connecting gear (321a) that is away from the supporting surface (314) of the main shaft (31). The second synchronous gear (3272) engages with the first synchronous gear (3271) and the first end (3231) of the first connecting arm (323).

25. The folding assembly (3) according to claim 24, characterized in that The connecting gear (321a) is an incomplete gear, and the connecting gear (321a) includes a supporting surface (321f) and a tooth portion (321e) disposed opposite to each other; When the first housing (1) and the second housing (2) are relatively unfolded to an open state, the tooth portion (321e) of the connecting gear (321a) faces the first synchronous gear (3271) and is located inside the main shaft (31), and the supporting surface (321f) of the connecting gear (321a) is flush with the supporting surface (314) of the main shaft (31); When the first shell (1) and the second shell (2) are folded relative to each other to a closed state, the connecting gear (321a) rotates relative to the main shaft (31), and the tooth portion (321e) of the connecting gear (321a) partially rotates out of the main shaft (31).

26. The folding assembly (3) according to claim 25, characterized in that In the width direction of the main shaft (31), the rotation center of the first synchronous gear (3271) is away from the rotation center of the second synchronous gear (3272) relative to the rotation center of the connecting gear (321a), and the width direction of the main shaft (31) is perpendicular to the thickness direction of the main shaft (31) and perpendicular to the extension direction of the main shaft (31).

27. The folding assembly (3) according to any one of claims 24 to 26, characterized in that The first end (3211) of the rotating arm (321) further includes an arc-shaped arm (321c), wherein the arc-shaped arm (321c) is fixed to one side of the connecting gear (321a), and the central axis of the arc-shaped arm (321c) is colinear with the central axis of the connecting gear (321a), and the arc-shaped arm (321c) is installed in the arc-shaped groove of the main shaft (31) to rotatably connect to the main shaft (31).

28. The folding assembly (3) according to any one of claims 22 to 27, characterized in that The rotation center of the first end (3241) of the second connecting arm (324) is closer to the flexible display screen (20) of the electronic device (100) than the rotation center of the first end (3231) of the first connecting arm (323).

29. The folding assembly (3) according to any one of claims 22 to 28, characterized in that When the second end (3242) of the second connecting arm (324) is slidably connected to the fixing frame (322), the direction in which the second end (3242) of the second connecting arm (324) slides relative to the fixing frame (322) is not parallel to the direction in which the second end (3232) of the first connecting arm (323) slides relative to the fixing frame (322).

30. The folding assembly (3) according to claim 29, characterized in that The fixing frame (322) has a first surface (322a), a second surface (322b), a third surface (322c), and a fourth surface (322d); the first surface (322a) and the second surface (322b) are arranged opposite to each other, and the first surface (322a) is located between the flexible display screen (20) of the electronic device (100) and the second surface (322b); the third surface (322c) and the fourth surface (322d) are arranged opposite to each other, and the third surface (322c) is located between the main shaft (31) and the fourth surface (322d); The fixing frame (322) includes a first slide groove (3221) and a second slide groove (3222), the extension direction of the second slide groove (3222) is not parallel to the extension direction of the first slide groove (3221), the openings at both ends of the first slide groove (3221) are respectively located on the first surface (322a) and the second surface (322b), and the openings at both ends of the second slide groove (3222) are respectively located on the third surface (322c) and the fourth surface (322d); The slider at the second end (3232) of the first connecting arm (323) is installed in the first sliding groove (3221) and is capable of sliding relative to the fixing frame (322) along the extension direction of the first sliding groove (3221); The slider of the second end (3242) of the second connecting arm (324) is installed in the second sliding groove (3222) and can move along the second sliding groove. The extending direction of the groove (3222) is sliding relative to the fixing frame (322).

31. The folding assembly (3) according to claim 29 or 30, characterized in that The folding assembly (3) further comprises a connecting rod (325), one end of which is rotatably connected to the first connecting arm (323), and the other end of which is rotatably connected to the second connecting arm (324).

32. The folding assembly (3) according to any one of claims 22 to 29, characterized in that The folding assembly (3) further comprises a support plate (35), wherein the support plate (35) is connected to the fixing frame (322), and the support plate (35) is also connected to the first connecting arm (323) or the second connecting arm (324); When the first shell (1) and the second shell (2) are relatively unfolded to an open state, the first shell (1), the main shaft (31), the support plate (35) and the second shell (2) are used to jointly support the flexible display screen (20) of the electronic device (100); The support plate (35) includes a first end (35a) close to the main axis (31) and a second end (35b) away from the main axis (31); when the first shell (1) and the second shell (2) are folded relative to each other to a closed state, the distance between the first end (35a) of the support plate (35) and the first shell (1) is greater than the distance between the second end (35b) of the support plate (35) and the first shell (1), so as to form a receiving space (30) between the support plate (35) and the first shell (1); and the flexible display screen (20) of the electronic device (100) is at least partially received in the receiving space (30).

33. The folding assembly (3) according to claim 32, characterized in that The fixing frame (322) has a first surface (322a), and the first surface (322a) is arranged toward the supporting plate (35); When the first shell (1) and the second shell (2) are relatively unfolded to an open state, a first angle is formed between the first surface (322a) and the support plate (35), and the distance between the end of the first surface (322a) close to the main shaft (31) and the support plate (35) is greater than the distance between the end of the first surface (322a) away from the main shaft (31) and the support plate (35); When the first shell (1) and the second shell (2) are folded relative to each other to a closed state, the support plate (35) rotates relative to the fixing frame (322) and approaches the first surface (322a), and a second angle is formed between the first surface (322a) and the support plate (35), and the second angle is smaller than the first angle.

34. The folding assembly (3) according to claim 33, characterized in that The fixing frame (322) further has a first rotation groove (3224), which is an arc-shaped groove and extends from the first surface (322a) to the inside of the fixing frame (322); The support plate (35) comprises a plate body (352) and a first rotating block (353); the plate body (352) is used to support the flexible display screen (20) when the first shell (1) and the second shell (2) are relatively unfolded to an open state; the first rotating block (353) is fixed to a side of the plate body (352) facing away from the flexible display screen (20); and an arc-shaped arm of the first rotating block (353) extends from the plate body (352) in a direction away from the main axis (31); The arc-shaped arm of the first rotating block (353) is installed in the first rotating groove (3224). During the relative expansion of the first shell (1) and the second shell (2), a part of the arc-shaped arm of the first rotating block (353) rotates out of the first rotating groove (3224). During the relative folding of the first shell (1) and the second shell (2), a part of the arc-shaped arm of the first rotating block (353) rotates into the first rotating groove (3224).

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