Foldable mobile terminal

Abstract

The present application relates to a foldable mobile terminal, including a shell assembly, a display screen and a folding mechanism. The shell assembly includes a first shell and a second shell. The display screen is arranged in combination with the first shell and the second shell. The folding mechanism includes a bearing plate, a first cover plate, a second cover plate, a first rotating arm and a second rotating arm, the bearing plate has a first side rotatably connected to the first cover plate, and a second side rotatably connected to the second cover plate, the first cover plate is slidably connected to the first shell, the second cover plate is slidably connected to the second shell, the two ends of the first rotating arm are respectively rotatably connected to the second side of the bearing plate and the first shell, and the two ends of the second rotating arm are respectively rotatably connected to the first side of the bearing plate and the second shell. The above foldable mobile terminal can smoothly switch between the unfolded state and the folded state, and is conducive to reducing the thickness of the foldable mobile terminal.

Description

Technical Field

[0001] The present application relates to the technical field of mobile terminals, and in particular to a foldable mobile terminal. Background Art

[0002] Existing foldable mobile terminals provide various folding mechanisms to meet the length difference change caused when the two sides of the mobile terminal switch between the unfolded state and the folded state. These folding mechanisms occupy a large space, which is not conducive to the miniaturization of the size of the mobile terminal. Summary of the invention

[0003] A technical problem solved by the present application is how to make a foldable mobile terminal have a smaller size.

[0004] A foldable mobile terminal, comprising:

[0005] A shell assembly including a first shell and a second shell;

[0006] A display screen, combined with the first shell and the second shell;

[0007] A folding mechanism includes a supporting plate, a first cover plate, a second cover plate, a first rotating arm and a second rotating arm, the supporting plate having a first side rotatably connected to the first cover plate, and a second side rotatably connected to the second cover plate, the first cover plate is slidably connected to the first shell, the second cover plate is slidably connected to the second shell, the two ends of the first rotating arm are respectively rotatably connected to the second side of the supporting plate and the first shell, and the two ends of the second rotating arm are respectively rotatably connected to the first side of the supporting plate and the second shell.

[0008] In the above foldable mobile terminal, the first cover plate can rotate relative to the carrier plate, and the first shell can slide and retract relative to the first cover plate, and the second cover plate can rotate relative to the carrier plate, and the second shell can slide and retract relative to the second cover plate, so that in the process of unfolding and closing, the length of the shell assembly can be increased or decreased to meet the change of the length difference between the display screen and the shell assembly, so that the foldable mobile terminal can be smoothly unfolded and closed. Since the two ends of the first rotating arm are respectively rotatably connected to the second side of the carrier plate and the first shell, and the two ends of the second rotating arm are respectively rotatably connected to the first side of the carrier plate and the second shell, the projections of the first rotating arm and the second rotating arm in the closed state can be cross-shaped. This arrangement makes the folding part formed by the first rotating arm and the second rotating arm in the closed state for accommodating the display screen smaller, which is conducive to the compact arrangement of the components of the foldable mobile terminal and the thinning of the thickness of the foldable mobile terminal in the closed state. The above-mentioned arrangement of the first rotating arm and the second rotating arm can also reduce the tensile stress of the shell assembly on the display screen during the rotation of the foldable mobile terminal, so as to prevent the display screen from being pulled and deformed during the rotation process, thereby extending the service life of the display screen.

[0009] A foldable mobile terminal, comprising:

[0010] Flexible screen;

[0011] A shell assembly, comprising a first shell and a second shell, wherein the first shell and the second shell are respectively connected to the flexible screen; and

[0012] The folding mechanism comprises a carrying plate, a first cover plate, a second cover plate, a first rotating arm and a second rotating arm, wherein the first cover plate and the second cover plate are respectively rotatably connected to the carrying plate; two ends of the first rotating arm are respectively rotatably connected to the carrying plate and the first shell, and two ends of the second rotating arm are respectively rotatably connected to the carrying plate and the second shell;

[0013] When the foldable mobile terminal switches between an unfolded state and a folded state, the first shell can drive the first cover plate to rotate relative to the supporting plate, and the first shell can slide and retract relative to the first cover plate; the second shell can drive the second cover plate to rotate relative to the supporting plate, and the second shell can slide and retract relative to the second cover plate; in the folded state, the orthographic projections of the first rotating arm and the second rotating arm on a reference plane intersect, and the reference plane is a geometric plane perpendicular to the rotation axis of the first cover plate.

[0014] In the above foldable mobile terminal, since the first shell can drive the first cover plate to rotate relative to the carrier plate and make the first shell slide and retract relative to the first cover plate, and the second shell can drive the second cover plate to rotate relative to the carrier plate and make the second shell slide and retract relative to the second cover plate, during the process of unfolding and closing, the length of the side of the shell assembly facing away from the flexible screen can be increased or reduced to meet the change of the length difference between the flexible screen and the shell assembly, so that the foldable mobile terminal can be smoothly unfolded and closed. Since the orthographic projections of the first rotating arm and the second rotating arm on the reference plane intersect in the closed state, this arrangement makes the accommodation space for the folding part of the flexible screen formed by the first rotating arm and the second rotating arm in the closed state smaller, which is conducive to the compact arrangement of the components of the foldable mobile terminal and the thinning of the thickness of the foldable mobile terminal in the closed state. The above-mentioned arrangement of the first rotating arm and the second rotating arm can also reduce the tensile stress of the shell assembly on the flexible screen during the rotation of the foldable mobile terminal to prevent the flexible screen from being pulled and deformed during the rotation process, thereby extending the service life of the flexible screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 is a three-dimensional diagram of a foldable mobile terminal in an unfolded state in an embodiment;

[0017] Figure 2 for Figure 1 An exploded view of the foldable mobile terminal shown;

[0018] Figure 3 for Figure 1 A three-dimensional diagram of the foldable mobile terminal in a folded state;

[0019] Figure 4 for Figure 3 An exploded view of the foldable mobile terminal shown;

[0020] Figure 5 for Figure 3 A three-dimensional diagram of a folding mechanism of the foldable mobile terminal with some components removed;

[0021] Figure 6 for Figure 1 A three-dimensional diagram of a folding mechanism of the foldable mobile terminal with some components removed;

[0022] Figure 7 for Figure 5 A three-dimensional diagram of the folding mechanism of the foldable mobile terminal after being assembled with the first housing;

[0023] Figure 8 for Figure 7 A three-dimensional view of the foldable mobile terminal after the folding mechanism and the first housing are assembled from another perspective;

[0024] Fig. 9 for Figure 7 A perspective view of a first cover plate of the foldable mobile terminal being removed from a carrying plate;

[0025] Fig.10 for Fig. 9 A three-dimensional diagram of the foldable mobile terminal after the first cover plate and the carrying plate are assembled;

[0026] Fig.11 for Fig.10 A three-dimensional diagram of the foldable mobile terminal after the first housing and the folding mechanism are assembled;

[0027] Fig.12 for Figure 3 A front view of the foldable mobile terminal shown;

[0028] Fig.13 for Fig.12 A cross-sectional view of the foldable mobile terminal along AA;

[0029] Fig.14 for Fig.13 An enlarged schematic diagram of point B of the foldable mobile terminal shown;

[0030] Fig.15 for Fig.12 A cross-sectional view of the foldable mobile terminal along CC;

[0031] Fig.16 for Fig.13 A schematic diagram showing the geometric relationship of various components of the foldable mobile terminal;

[0032] Fig.17 for Fig.16 A schematic diagram of a geometric model of various components of the foldable mobile terminal shown;

[0033] Fig.18 for Figure 4 A schematic diagram of the matching relationship between the damping assembly and the first rotating shaft of the foldable mobile terminal;

[0034] Fig.19 for Figure 1 A cross-sectional view of the foldable mobile terminal shown;

[0035] Fig. 20 for Fig.12 The foldable mobile terminal is shown in a cross-sectional view along DD. DETAILED DESCRIPTION

[0036] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0037] As used herein, "terminal equipment" refers to a device that can receive and / or send communication signals, including but not limited to a device that is connected via any one or more of the following connection methods:

[0038] (1) Connection via wired lines, such as Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, and direct cable connection;

[0039] (2) Via wireless interfaces, such as cellular networks, wireless local area networks (WLAN), digital television networks such as DVB-H networks, satellite networks, and AM-FM broadcast transmitters.

[0040] Terminal devices configured to communicate via a wireless interface may be referred to as "mobile terminals". Examples of mobile terminals include, but are not limited to, the following electronic devices:

[0041] (1) Satellite phone or cellular phone;

[0042] (2) Personal Communications System (PCS) terminals that can combine cellular radio telephones with data processing, fax, and data communications capabilities;

[0043] (3) Radiotelephone, pager, Internet / intranet access, Web browser, notepad, calendar, Personal Digital Assistant (PDA) equipped with a Global Positioning System (GPS) receiver;

[0044] (4) conventional laptop and / or palmtop receivers;

[0045] (5) Conventional laptop and / or palmtop radio telephone transceivers, etc.

[0046] refer to Figure 1 and Figure 2 In one embodiment, the foldable mobile terminal 10 is a smart phone. The foldable mobile terminal 10 includes a display screen 100, a housing assembly 200 and a folding mechanism 300. Figure 3 and Figure 4 The shell assembly 200 includes a first shell 210 and a second shell 220, and the first shell 210 and the second shell 220 are respectively connected to the display screen 100. The display screen 100 can be used to display information and provide an interactive interface for the user. The display screen 100 can be fixedly connected to the first shell 210 and the second shell 220 by dispensing or other methods. The first shell 210 and the second shell 220 can respectively form an installation space for installing electronic components such as circuit boards, batteries, receivers, speakers, and cameras of the foldable mobile terminal 10. Among them, the circuit board can integrate electronic components such as the main controller, storage unit, antenna module, and power management module of the foldable mobile terminal 10, and the battery can power the electronic components such as the display screen 100, circuit boards, receivers, speakers, and cameras. In other embodiments, the foldable mobile terminal 10 can also be a tablet computer, etc.

[0047] Also refer to Figure 3 and Figure 4 The housing assembly 200 can realize the switching of the foldable mobile terminal 10 between the unfolded state and the folded state through the folding mechanism 300. The folding mechanism 300 includes a carrier plate 310, a first cover plate 320, a second cover plate 330, a first rotating arm 340 and a second rotating arm 350. The first cover plate 320 and the second cover plate 330 are in the shape of strip blocks, and the first cover plate 320 and the second cover plate 330 are respectively rotatably connected to the carrier plate 310. Figure 5 and Figure 6 , the first rotating arm 340 and the second rotating arm 350 are substantially L-shaped. Figure 7 and Figure 8 , the two ends of the first rotating arm 340 are rotatably connected to the supporting plate 310 and the first shell 210, respectively, and the two ends of the second rotating arm 350 are rotatably connected to the supporting plate 310 and the second shell 220, respectively. Further, the side of the first rotating arm 340 facing away from the display screen 100 can adopt a smooth transition of an arc surface, so that at least a part of the cross section of the first rotating arm 340 is roughly an elliptical arc. Similarly, the side of the second rotating arm 350 facing away from the display screen 100 can also adopt a smooth transition of an arc surface, so that at least a part of the cross section of the second rotating arm 350 is roughly an elliptical arc. In other embodiments, the cross section of the first rotating arm 340 and the cross section of the second rotating arm 350 can also be other similar curves.

[0048] Also refer to Fig. 9 , Fig.10 and Fig.11When the foldable mobile terminal 10 switches between the unfolded state and the closed state, the first housing 210 can drive the first cover plate 320 to rotate relative to the carrier plate 310, and the first housing 210 can slide and retract relative to the first cover plate 320, and the second housing 220 can drive the second cover plate 330 to rotate relative to the carrier plate 310, and the second housing 220 can slide and retract relative to the second cover plate 330. Specifically, in the process of the foldable mobile terminal 10 switching from the unfolded state to the closed state, the first housing 210 can slide relative to the first cover plate 320, the second housing 220 can slide relative to the second cover plate 330, and the length of the shell assembly 200 can be adaptively extended. In the process of the foldable mobile terminal 10 switching from the closed state to the unfolded state, the first housing 210 can slide relative to the first cover plate 320, the second housing 220 can slide relative to the second cover plate 330, and the length of the shell assembly 200 can be adaptively shortened.

[0049] Since the first shell 210 can slide and retract relative to the first cover plate 320, and the second shell 220 can slide and retract relative to the second cover plate 330, during the unfolding and folding process of the foldable mobile terminal 10, the length of the shell assembly 200 can be adaptively increased or decreased to meet the length difference between the display screen 100 and the shell assembly 200, thereby enabling the foldable mobile terminal 10 to be smoothly unfolded and folded.

[0050] refer to Figure 1 and Figure 2 In one embodiment, the foldable mobile terminal 10 is roughly rectangular in shape when in the unfolded state. The unfolded state of the foldable mobile terminal 10 can be used as a reference to establish a coordinate system, and the length direction of the foldable mobile terminal 10 is defined as the x-axis, the width direction is the y-axis, and the thickness direction is the z-axis. Figure 5 and Figure 6 , the first rotating arm 340 and the second rotating arm 350 are spaced apart in the y-axis direction, and the first rotating arm 340 and the second rotating arm 350 are arranged in pairs, that is, one first rotating arm 340 and one second rotating arm 350 form a pair. Figure 5 and Figure 6 In the illustrated embodiment, the foldable mobile terminal 10 includes two first rotating arms 340 and two second rotating arms 350, which can be formed into two pairs in the above-mentioned form, one pair of which is arranged at one end of the carrying plate 310, and the other pair of which is arranged at the other end of the carrying plate 310. Taking one pair as an example, in the width direction of the foldable mobile terminal 10, the first rotating arm 340 is closer to the edge of the display screen 100 than the second rotating arm 350. Of course, in other embodiments, the foldable mobile terminal 10 can be provided with only one first rotating arm 340 and one second rotating arm 350, and the two are respectively arranged at the two ends of the carrying plate 310. Alternatively, the foldable mobile terminal 10 can also be provided with more than two pairs of first rotating arms 340 and second rotating arms 350.

[0051] In one embodiment, when the foldable mobile terminal 10 is fully unfolded, the display screen 100 is flattened, and the foldable mobile terminal 10 has a large-screen display effect. Figure 3 In the closed state, the first housing 210 is stacked on the second housing 220, and the display screen 100 is sandwiched between the first housing 210 and the second housing 220. Fig.12 , Fig.13 and Fig.14 , the display screen 100 is a flexible screen, the flexible screen includes a bendable portion 110 and a plane area 120 connected to both sides of the bendable portion 110, and the flattened state of the flexible screen is used as the reference zero position of the angle. Since the flexible screen has a limited bending radius, when the foldable mobile terminal 10 is folded, the angle between the plane areas 120 on both sides of the bendable portion 110 of the flexible screen can be an acute angle, or the plane areas 120 on both sides are parallel to each other. Of course, in other embodiments, the display screen 100 may include two LCD (Liquid Crystal Display) screens, the two LCD screens are respectively connected to the first shell 210 and the second shell 220, and the two LCD screens are connected by a flexible material such as silicone for easy bending. Alternatively, the display screen 100 may include two OLED (Organic Light-Emitting Diode) screens, the two OLED screens are respectively connected to the first shell 210 and the second shell 220, and the two OLED screens are connected by a flexible material such as silicone for easy bending.

[0052] refer to Fig.12 , Fig.13 , Fig.14 and Fig.15, a geometric plane perpendicular to the width direction (y-axis direction) of the foldable mobile terminal 10 is made, and this geometric plane is used as a reference plane. Of course, the rotation axis of the first cover plate 320 or the second cover plate 330 can also be used as a reference to make a geometric plane perpendicular to the rotation axis of the first cover plate 320 or the second cover plate 330, and the above-mentioned reference plane can also be obtained. In the closed state, the orthographic projections of the first rotating arm 340 and the second rotating arm 350 on the reference plane intersect. When the cross section of the first rotating arm 340 is roughly elliptical arc-shaped, and the cross section of the second rotating arm 350 is roughly elliptical arc-shaped or other similar curves, in the closed state, the side of the first rotating arm 340 and the second rotating arm 350 facing the display screen 100 can be closer to the display screen 100 to form a receiving space adapted to the bending shape of the display screen 100, and the distance between the end of the first rotating arm 340 connected to the first shell 210 and the end of the second rotating arm 350 connected to the second shell 220 can be smaller. In the folded state, the curved first rotating arm 340 and the curved second rotating arm 350 can form a smaller opening width, so that the arrangement of components can be more compact, so that the foldable mobile terminal 10 has a thinner thickness in the folded state.

[0053] In the above foldable mobile terminal 10, since the orthographic projections of the first rotating arm 340 and the second rotating arm 350 on the reference plane intersect when in the folded state, this arrangement makes the accommodation space for the bendable portion 110 of the flexible screen formed by the first rotating arm 340 and the second rotating arm 350 in the folded state smaller, which is conducive to the compact arrangement of the components of the foldable mobile terminal 10 and the thinning of the thickness of the foldable mobile terminal 10 in the folded state. Since the two ends of the first rotating arm 340 rotate relative to the first shell 210 and the carrier plate 310 respectively, and the two ends of the second rotating arm 350 rotate relative to the second shell 220 and the carrier plate 310 respectively, during the rotation process of the foldable mobile terminal 10, the above structure can prevent the flexible screen from sliding relative to the first shell 340 or the second shell 350, so as to reduce the tensile stress of the shell assembly 200 on the flexible screen, and prevent the flexible screen from being pulled and deformed during the rotation process, thereby extending the service life of the flexible screen.

[0054] Refer to Figure 5 and Figure 6In one embodiment, the folding mechanism 300 includes a first rotating shaft 312 and a second rotating shaft 313 rotatably connected to the carrier plate 310, a first rotating arm 340 connected to the second rotating shaft 313, and a second rotating arm 350 connected to the first rotating shaft 312. The first rotating arm 340 can rotate relative to the carrier plate 310 through the second rotating shaft 313, and the second rotating arm 350 can rotate relative to the carrier plate 310 through the first rotating shaft 312. Further, the folding mechanism 300 includes a third rotating shaft 314 and a fourth rotating shaft 315 connected to the carrier plate 310, and a first gear 316 connected to the first rotating shaft 312, a second gear 317 connected to the second rotating shaft 313, a third gear 318 connected to the third rotating shaft 314, and a fourth gear 319 connected to the fourth rotating shaft 315, the first gear 316 and the fourth gear 319 are respectively meshed with the third gear 318, and the second gear 317 is meshed with the fourth gear 319. The first housing 210 can drive the second gear 317 to rotate via the first rotating arm 340, and the second housing 220 can drive the first gear 316 to rotate via the second rotating arm 350. The folding mechanism 300 of the above structure can realize synchronous rotation of the first housing 210 and the second housing 220.

[0055] Specifically, in one embodiment, the first gear 316, the second gear 317, the third gear 318, and the fourth gear 319 are incomplete gears, the first gear 316 is fixedly connected to the first rotating shaft 312, the second gear 317 is fixedly connected to the second rotating shaft 313, the third gear 318 is fixedly connected to the third rotating shaft 314, and the fourth gear 319 is fixedly connected to the fourth rotating shaft 315. The first gear 316 can be integrally formed with the first rotating shaft 312 or detachably connected, the second gear 317 can be integrally formed with the second rotating shaft 313 or detachably connected, the third gear 318 can be integrally formed with the third rotating shaft 314 or detachably connected, and the fourth gear 319 can be integrally formed with the fourth rotating shaft 315 or detachably connected. The first rotating shaft 312, the second rotating shaft 313, the third rotating shaft 314, and the fourth rotating shaft 315 are rotatably connected to the bearing plate 310 respectively. The first rotating arm 340 is fixedly connected to the second rotating shaft 313, and the second rotating arm 350 is fixedly connected to the first rotating shaft 312. The first shell 210 can drive the second gear 317 to rotate through the first rotating arm 340 and the second rotating shaft 313, and then drive the fourth gear 319 and the fourth rotating shaft 315 to rotate. The second shell 220 can drive the first gear 316 to rotate through the second rotating arm 350 and the first rotating shaft 312, and then drive the third gear 318 and the third rotating shaft 314 to rotate, thereby realizing the synchronous rotation of the first shell 210 and the second shell 220.

[0056] Of course, in other embodiments, the third gear 318 is rotatably connected to the third rotating shaft 314, and the third rotating shaft 314 is fixedly connected to the bearing plate 310; the fourth gear 319 is rotatably connected to the fourth rotating shaft 315, and the fourth rotating shaft 315 is fixedly connected to the bearing plate 310. Compared with the structure in which both ends of the third rotating shaft 314 and the fourth rotating shaft 315 are both bearing and rotating, the above arrangement can separate the bearing function from the rotating function, thereby enhancing the stability of the structure and preventing the third rotating shaft 314 or the fourth rotating shaft 315 from being damaged by excessive rotation force.

[0057] refer to Fig.18 The foldable mobile terminal 10 may further include a damping assembly 400, which is connected to the folding mechanism 300. When the foldable mobile terminal 10 switches between the unfolded state and the folded state, the damping assembly 400 can change the rotation damping of the housing assembly 200. Specifically, refer to Fig.18 The damping assembly 400 includes an elastic member 410 sleeved on the first rotating shaft 312, a movable cam 420 sleeved on the first rotating shaft 312 and capable of sliding along the first rotating shaft 312, and a bearing plate 310 (reference Figure 5 and Figure 6 ) is fixedly connected to the fixed cam 430. One end of the elastic member 410 abuts the first rotating shaft 312, and the other end abuts the movable cam 420. Of course, the elastic member 410 can also abut against the carrier plate 310 at one end, and abut against the movable cam 420 at the other end. In one embodiment, the elastic member is a spring. When the foldable mobile terminal 10 switches between the unfolded state and the closed state, the second shell 220 drives the first rotating shaft 312 to rotate relative to the carrier plate 310 through the second rotating arm 350, and the first rotating shaft 312 drives the movable cam 420 to rotate and abut against the fixed cam 430. The elastic member 410 is in a compressed state so that the movable cam 420 can squeeze the fixed cam 430. During the unfolding and closing process of the foldable mobile terminal 10, the friction between the movable cam 420 and the fixed cam 430 can be used for the instant positioning of the first shell 210 and the second shell 220. Of course, it is understandable that the damping assembly 400 may also be disposed on the second rotating shaft 313 , or the third rotating shaft 314 , or the fourth rotating shaft 315 , so as to achieve a stuttering effect when the foldable mobile terminal 10 is unfolded and folded.

[0058] Further, a first protrusion 421 is provided on the side of the movable cam 420 facing the fixed cam 430, and a second protrusion 431 is provided on the side of the fixed cam 430 facing the movable cam 420. When the foldable mobile terminal 10 switches between the unfolded state and the folded state, the first protrusion 421 can slide on the second protrusion 431 to change the squeezing force of the elastic member 410 on the movable cam 420, thereby changing the rotation damping of the shell assembly 200. The cooperation of the first protrusion 421 and the second protrusion 431 can be used to achieve the effect of stuck positioning at a specific angle. For example, by designing the starting position and the ending position of the first protrusion 421 and the second protrusion 431, the movable cam 420 slides along the first rotating shaft 312 at the starting position and the ending position, so that the squeezing of the movable cam 420 on the fixed cam 430 is suddenly reduced, thereby providing clear and timely feedback to the user. For example, multiple first protrusions 421 or multiple second protrusions 431 may be provided to provide a clear and timely pause feeling when the two plane areas 120 of the display screen 100 are at an angle of 30 degrees, 60 degrees, 90 degrees or 120 degrees.

[0059] refer to Figure 5 and Figure 6 The carrier plate 310 is provided with a receiving groove 360, and the first gear 316, the second gear 317, the third gear 318, the fourth gear 319, the first rotating shaft 312, the second rotating shaft 313, the third rotating shaft 314, and the fourth rotating shaft 315 are located in the receiving groove 360. Figure 6 In the unfolded state, the first rotating arm 340 and the second rotating arm 350 are received in the receiving groove 360. Figure 7 and Figure 8 Compared with the unfolded state, in the closed state, the end of the first rotating arm 340 connected to the first housing 210 is further away from the bottom of the receiving groove 360, and the end of the second rotating arm 350 connected to the second housing 220 is further away from the bottom of the receiving groove 360. Further, in one embodiment, in the closed state, the end of the first rotating arm 340 connected to the first housing 210 extends out of the receiving groove 360, and the end of the second rotating arm 350 connected to the second housing 220 extends out of the receiving groove 360.

[0060] Specifically, refer to Figure 5 and Figure 6 The carrier plate 310 may include a bottom wall 311a, a first side wall 311b and a second side wall 311c disposed opposite to each other, and a first end wall 311d and a second end wall 311e disposed opposite to each other (refer to Figure 7). The first side wall 311b and the second side wall 311c are respectively connected to the two side edges of the bottom wall 311a, the first end wall 311d is connected to one end of the bottom wall 311a, the first side wall 311b and the second side wall 311c, the second end wall 311e is connected to the other end of the bottom wall 311a, the first side wall 311b and the second side wall 311c, and the first side wall 311b, the first end wall 311d, the second side wall 311c, the second end wall 311e and the bottom wall 311a are surrounded to form a receiving groove 360. In one embodiment, the carrier plate 310 can be divided into two sides, i.e., a first side and a second side, from the middle part of the bottom wall 311a along the y-axis direction. The first side wall 311b is located on the first side of the carrier plate 310, the second side wall 311c is located on the second side of the carrier plate 310, the bottom wall 311a, the first end wall 311d, and half of the second end wall 311e are located on the first side, and the other half of the bottom wall 311a, the first end wall 311d, and the second end wall 311e are located on the second side. The first cover plate 320 is rotatably connected to the first side of the carrier plate 310, and the second cover plate 330 is rotatably connected to the second side of the carrier plate 310. The first cover plate 320 is slidably connected to the first shell 210, and the second cover plate 330 is slidably connected to the second shell 220. The two ends of the first rotating arm 340 are rotatably connected to the second side of the carrier plate 310 and the first shell 210, respectively, and the two ends of the second rotating arm 350 are rotatably connected to the first side of the carrier plate 310 and the second shell 220, respectively.

[0061] In one embodiment, reference Figure 5 and Figure 6 The carrier plate 310 includes a mounting plate 311f connecting the first side wall 311b and the second side wall 311c. The extending direction of the mounting plate 311f is substantially parallel to the first end wall 311d and the second end wall 311e. The two ends of the mounting plate 311f can be integrally formed with the bottom wall 311a, the first side wall 311b, and the second side wall 311c. The first rotating shaft 312 is rotatably connected to one end of the mounting plate 311f close to the first side wall 311b, and the second rotating shaft 313 is rotatably connected to one end of the mounting plate 311f close to the second side wall 311c. The third rotating shaft 314 and the fourth rotating shaft 315 are mounted on the mounting plate 311f, and the mounting plate 311f can support the first rotating shaft 312, the second rotating shaft 313, the third rotating shaft 314, and the fourth rotating shaft 315.

[0062] Further, refer to Fig.19The first rotating arm 340 may include an integrally formed extension section 341, a bending section 343 and a connecting section 345, the bending section 343 is located between the extension section 341 and the connecting section 345, the extension section 341 is connected to the first shell 210, and the connecting section 345 is connected to the second rotating shaft 313. The bottom wall 311a is provided with a groove 361 connected to the accommodating groove 360, the cross-sectional curvature of the groove 361 is greater than the cross-sectional curvature of the accommodating groove 360, and the cross-sectional curvature of the bending section 343 is substantially the same as the cross-sectional curvature of the accommodating groove 360. In the unfolded state, the bending section 343 is accommodated in the groove 361. The above structure enables the foldable mobile terminal 10 to have a thinner thickness in the unfolded state. The structure of the second rotating arm 350 may be similar to that of the first rotating arm 340. Specifically, as Fig.15 As shown in , the second rotating arm 350 may include an integrally formed extension section 341, a bending section 343 and a connecting section 345, the bending section 343 is located between the extension section 341 and the connecting section 345, the extension section 341 of the second rotating arm 350 is connected to the second housing 220, and the connecting section 345 of the second rotating arm 350 is connected to the first rotating shaft 312. The bottom wall 311a is provided with a groove 361 connected to the receiving groove 360, the cross-sectional curvature of the groove 361 is greater than the cross-sectional curvature of the receiving groove 360, the cross-sectional curvature of the bending section 343 of the second rotating arm 350 is substantially the same as the cross-sectional curvature of the receiving groove 360, and in the unfolded state, the bending section 343 of the second rotating arm 350 is accommodated in the groove 361, so that the foldable mobile terminal 10 has a thinner thickness in the unfolded state.

[0063] Refer to Figure 4 In one embodiment, the folding mechanism 300 includes a baffle 380, which includes an integrally formed plate body 381 and two pins 383, one of which penetrates the carrier plate 310 and the first cover plate 320, and the other pin 383 penetrates the carrier plate 310 and the second cover plate 330, and the first cover plate 320 and the second cover plate 330 are rotatably connected to the carrier plate 310 through the pins 383. Specifically, in combination with Fig. 9 and Fig.10 Taking the baffle 380 connected to the first end wall 311d as an example, one pin 383 passes through the first end wall 311d and the first cover plate 320, and the other pin 383 passes through the first end wall 311d and the second cover plate 330. The first cover plate 320 and the second cover plate 330 are rotatably connected to the first end wall 311d through the pin 383. The baffle 380 can also be set at the second end wall 311e. Its structure and function correspond to those of the baffle 380 at the first end wall 311d, and will not be repeated here. Further, refer to Fig. 9 , Fig.19The first cover plate 320 and the second cover plate 330 may be provided with step structures 322 correspondingly, so that when the foldable mobile terminal 10 is unfolded to a flat state, the step structures 322 of the first cover plate 320 and the second cover plate 330 can abut against the carrier plate 310 to limit the continued rotation of the first shell 210 and the second shell 220. Figure 5 and Figure 6 The supporting plate 310 may include two extension arms 311g, and the two extension arms 311g are respectively connected to the first end wall 311d and the second end wall 311e. Specifically, one of the extension arms 311g can be integrally formed with the first end wall 311d, and the other extension arm 311g can be integrally formed with the second end wall 311e. When the baffle 380 is installed on the first end wall 311d or the second end wall 311e, the side of the extension arm 311g facing the baffle 380 can abut against the baffle 380 to support the baffle 380.

[0064] refer to Figure 4 , Fig.10 The folding mechanism 300 includes a fixing plate 370 fixedly connected to the carrying plate 310. The fixing plate 370 is in a strip-shaped block shape and covers a portion of the accommodating groove 360. Fig.19 The display screen 100 includes a display surface and a non-display surface that are disposed opposite to each other. When in the unfolded state, the fixing plate 370 abuts against the non-display surface of the display screen 100. Fig.14 and Fig.15 , in the closed state, there is a gap between the fixing plate 370 and the display screen 100. The above arrangement prevents the display screen 100 from being squeezed by the fixing plate 370 in the closed state, thereby preventing the display screen 100 from being damaged. Of course, it can be known from the above contents that the cross section of the first rotating arm 340 can be in the shape of an elliptical arc, and the cross section of the second rotating arm 350 can be in the shape of an elliptical arc. The structural arrangement of the first rotating arm 340 and the second rotating arm 350 can avoid squeezing the display screen 100 in the closed state, and this arrangement can prevent the display screen 100 from being improperly squeezed, thereby preventing the life of the display screen 100 from being damaged.

[0065] Specifically, refer to Fig.16 and Fig.17 , taking the first rotating arm 340 as an example, a geometric model is established. The parameters in the model are defined as follows:

[0066] O 11 : The rotation center of the first rotating shaft 312;

[0067] O 21 : The rotation center of the second rotating shaft 313;

[0068] O 22 : The rotation center of the connection between the first rotating arm 340 and the first shell 210;

[0069] R:O 22 Around O 21 The radius of the circle of rotation;

[0070] r: bending radius of the flexible screen;

[0071] D: rotation center O of the first rotating shaft 312 11 The rotation center O of the second rotation axis 313 21 The distance between

[0072] m: The difference between the orthographic projection of the bending center of the flexible screen in the plane area of ​​the flexible screen and O 22 The distance between the orthographic projections of the planar area;

[0073] L: O when closed 22 The vertical distance between the non-display surface corresponding to the plane area of ​​the flexible screen; when the flexible screen is unfolded, O 22 The trajectory reaches O 23 At the position where the non-display surface of the flexible screen abuts against the upper surface of the fixing plate 370, the distance L is equal to O 23 A distance from the upper surface of the fixing plate 370;

[0074] h: The flexible screen is flattened when unfolded, O 22 The trajectory reaches O 23 O 23 With O 11 The height between

[0075] α: the angle between the two plane areas of the flexible screen when closed;

[0076] H: O when closed 22 With O 21 The height between

[0077] θ: the angle between the plane area of ​​the flexible screen and the vertical direction when in the folded state;

[0078] d: O in the expanded state 23 With O 11 The horizontal distance between.

[0079] According to the geometric relationship, we know that: θ = α / 2;

[0080] According to the Pythagorean theorem, we get: (D+d) 2 +h 2 =R 2 (1)

[0081] According to the length correspondence between the folded state and the unfolded state of the flexible screen, it can be known that:

[0082]

[0083] In the closed state, in order to make the gap between the flexible screen and the fixed plate 370 greater than or equal to 0, the following geometric relationship should be satisfied:

[0084] HhL-(m cosθ+r+r sinθ)≥0 (3)

[0085] Specifically, in formula (3), the left side of the inequality corresponds to the gap between the flexible screen and the fixed plate 370; the orthographic projection of the bending center of the flexible screen on the plane area of ​​the flexible screen in the closed state is equal to O 22 When the distance m between the orthographic projections of the plane area is projected in the vertical direction, the corresponding length is m cosθ; when in the folded state, the vertical height between the orthographic projection of the bending center of the flexible screen in the plane area of ​​the flexible screen and the bending center of the flexible screen is rsinθ.

[0086] Combining the above equations (1), (2), and (3), it can be seen that in the design process of the foldable mobile terminal 10, the flexible screen should be flattened in the unfolded state, and the gap between the flexible screen and the fixing plate 370 should be greater than or equal to 0 in the folded state, so as to prevent the flexible screen from being improperly squeezed and causing the life of the flexible screen to be damaged. The parameters should satisfy the following relationship: During the design process, the structure of each component can be designed according to this relationship. It is worth noting that when the value of α is small, the two plane areas of the flexible screen are approximately parallel in the folded state, and the above relationship can be simplified to:

[0087] Further, refer to Fig.10 , the edges of the fixed plate 370 on opposite sides are respectively provided with a first notch 371 and a second notch 373. In the closed state, the first rotating arm 340 is provided with the first notch 371, and the second rotating arm 350 is provided with the second notch 373. The provision of the first notch 371 and the second notch 373 can provide an escape space for the rotation of the first rotating arm 340 and the second rotating arm 350, and can make the part of the first rotating arm 340 protruding from the fixed plate 370 and the part of the second rotating arm 350 protruding from the fixed plate 370 as close as possible in the closed state, so that the foldable mobile terminal 10 can have a thinner thickness in the closed state.

[0088] refer to Fig.11 The first housing 210 includes a first support plate 211 and a first connecting plate 213 fixedly connected to the first support plate 211. The first connecting plate 213 is rotatably connected to the first rotating arm 340 and is slidably connected to the first cover plate 320. The second housing 220 includes a second support plate 221 and a second connecting plate 223 fixedly connected to the second support plate 221 (refer to Figure 4), the second connecting plate 223 is rotatably connected to the second rotating arm 350 and is slidably connected to the second cover plate 330. Further, refer to Fig. 9 , Fig.10 , Fig. 20 The first connecting plate 213 is provided with a first slide groove 214, and the first cover plate 320 is provided with a first guide rail 321. The first guide rail 321 is accommodated in the first slide groove 214 and can slide in the first slide groove 214. The first slide groove 214 can limit and guide the sliding of the first guide rail 321. In the process of the first support plate 211 rotating, the first support plate 211 can drive the first cover plate 320 to rotate relative to the bearing plate 310 through the first connecting plate 213. A rotating space is formed between the first connecting plate 213 and the first cover plate 320 for the first rotating arm 340 to rotate relative to the first connecting plate 213. At the same time, refer to Fig. 20 The second connecting plate 223 is provided with a second slide groove 224, and the second cover plate 330 is provided with a second guide rail 331. The second guide rail 331 is accommodated in the second slide groove 224 and can slide in the second slide groove 224. The second slide groove 224 can limit and guide the sliding of the second guide rail 331, and during the rotation of the second support plate 221, the second support plate 221 can drive the second cover plate 330 to rotate relative to the supporting plate 310 through the second connecting plate 223, and a rotation space is formed between the second connecting plate 223 and the second cover plate 330 for the second rotating arm 350 to rotate relative to the second connecting plate 223.

[0089] Further, refer to Figure 4 The first connecting plate 213 includes a first body 215 and a first boss 217 integrally formed with the first body 215. Figure 2 The second connecting plate 223 includes a second body 225 and a second boss 227 integrally formed with the second body 225. Figure 2 In the unfolded state, the first boss 217 is embedded with a first notch 371, and the second boss 227 is embedded with a second notch 373. Fig.19 , in the unfolded state, the side of the first body 215 facing the display screen 100 and the side of the second body 225 facing the display screen 100 are respectively flush with the side of the fixing plate 370 facing the display screen 100. The cooperation between the first boss 217 and the first notch 371, and the cooperation between the second boss 227 and the second notch 373, enable the bendable portion 110 of the display screen 100 and the plane area 120 connected to the bendable portion 110 to be continuously supported when the foldable mobile terminal 10 is in the unfolded state, so that the display screen 100 can be unfolded more smoothly and is convenient for users to use. For example, when the bendable portion 110 of the display screen 100 displays an interactive graphical interface, the user touches this area, which will not cause the display screen 100 to sag, and can better protect the display screen 100.

[0090] refer to Fig. 20 In one embodiment, the first body 215 is provided with a first sinking groove 218, a part of the structure of the first support plate 211 is accommodated in the first sinking groove 218, and the side of the first support plate 211 facing the display screen 100 is flush with the side of the first body 215 facing the display screen 100. Figure 4 , Fig. 20 The second body 225 is provided with a second sinking groove 228, and part of the structure of the second support plate 221 is accommodated in the second sinking groove 228. Fig.19 , the side of the second support plate 221 facing the display screen 100 is flush with the side of the second body 225 facing the display screen 100. The provision of the first sink groove 218 and the second sink groove 228 facilitates the assembly of the first support plate 211 and the first connecting plate 213, and facilitates the assembly of the second support plate 221 and the second connecting plate 223. Since the side of the first support plate 211 facing the display screen 100 is flush with the side of the first body 215 facing the display screen 100, and the side of the second support plate 221 facing the display screen 100 is flush with the side of the second body 225 facing the display screen 100, the above provision enables the display screen 100 to obtain effective support when in the unfolded state, and facilitates the display screen 100 to unfold more smoothly.

[0091] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A foldable mobile terminal, characterized in that: include: A shell assembly, comprising a first shell and a second shell, wherein the first shell and the second shell are respectively formed with installation spaces for installing electronic components of the foldable mobile terminal; A display screen, combined with the first shell and the second shell; A folding mechanism includes a supporting plate, a first cover plate, a second cover plate, a first rotating arm and a second rotating arm, the supporting plate having a first side rotatably connected to the first cover plate, and a second side rotatably connected to the second cover plate, the first cover plate is slidably connected to the first shell, the second cover plate is slidably connected to the second shell, the two ends of the first rotating arm are respectively rotatably connected to the second side of the supporting plate and the first shell, and the two ends of the second rotating arm are respectively rotatably connected to the first side of the supporting plate and the second shell.

2. The foldable mobile terminal according to claim 1, characterized in that: The folding mechanism includes a first rotating shaft rotatably connected to a first side of the supporting plate, a second rotating shaft rotatably connected to a second side of the supporting plate, the first rotating arm is connected to the second rotating shaft, and the second rotating arm is connected to the first rotating shaft.

3. The foldable mobile terminal according to claim 2, characterized in that: The folding mechanism includes a third rotating shaft and a fourth rotating shaft connected to the supporting plate, and a first gear connected to the first rotating shaft, a second gear connected to the second rotating shaft, a third gear connected to the third rotating shaft, and a fourth gear connected to the fourth rotating shaft. The first gear and the fourth gear are respectively meshed with the third gear, and the second gear is meshed with the fourth gear. The first shell can drive the second gear to rotate through the first rotating arm, and the second shell can drive the first gear to rotate through the second rotating arm.

4. The foldable mobile terminal according to claim 1, characterized in that: The supporting plate is provided with a receiving groove, and in the expanded state, the first rotating arm and the second rotating arm are accommodated in the receiving groove; compared with the expanded state, in the closed state, the end of the first rotating arm connected to the first shell is farther away from the bottom of the receiving groove, and the end of the second rotating arm connected to the second shell is farther away from the bottom of the receiving groove.

5. The foldable mobile terminal according to claim 4, characterized in that: In the closed state, one end of the first rotating arm connected to the first shell extends out of the accommodating groove, and one end of the second rotating arm connected to the second shell extends out of the accommodating groove.

6. The foldable mobile terminal according to claim 4, characterized in that: The carrying plate includes a bottom wall, a first side wall and a second side wall disposed opposite to each other, and a first end wall and a second end wall disposed opposite to each other, the first side wall and the second side wall are respectively connected to two side edges of the bottom wall, the first end wall is connected to one end of the bottom wall, the first side wall and the second side wall, the second end wall is connected to the other ends of the bottom wall, the first side wall and the second side wall, and the first side wall, the first end wall, the second side wall, the second end wall and the bottom wall enclose the containing groove; The first side wall of the carrying plate is located at the first side, and the second side wall of the carrying plate is located at the second side.

7. The foldable mobile terminal according to claim 6, characterized in that: The first rotating arm includes an integrally formed extension section, a bending section and a connecting section, the bending section is located between the extension section and the connecting section, the extension section is connected to the first shell, and the connecting section is connected to the second side wall; the bottom wall is provided with a groove connected to the accommodating groove, the cross-sectional curvature of the groove is greater than the cross-sectional curvature of the accommodating groove, the cross-sectional curvature of the bending section is substantially the same as the cross-sectional curvature of the accommodating groove, and in the unfolded state, the bending section is accommodated in the groove.

8. The foldable mobile terminal according to claim 6, characterized in that: The second rotating arm includes an integrally formed extension section, a bending section and a connecting section, the bending section is located between the extension section and the connecting section, the extension section is connected to the second shell, and the connecting section is connected to the first side wall; the bottom wall is provided with a groove connected to the accommodating groove, the cross-sectional curvature of the groove is greater than the cross-sectional curvature of the accommodating groove, the cross-sectional curvature of the bending section is substantially the same as the cross-sectional curvature of the accommodating groove, and in the unfolded state, the bending section is accommodated in the groove.

9. The foldable mobile terminal according to claim 6, characterized in that: The supporting plate also includes a mounting plate connecting the first side wall and the second side wall, the folding mechanism includes a first rotating shaft rotatably connected to one end of the mounting plate close to the first side wall, and a second rotating shaft rotatably connected to one end of the mounting plate close to the second side wall, the first rotating arm is connected to the second rotating shaft, and the second rotating arm is connected to the first rotating shaft.

10. The foldable mobile terminal according to claim 1, characterized in that: The folding mechanism comprises a fixing plate fixedly connected to the carrying plate. In an unfolded state, the fixing plate abuts against the display screen. In a folded state, there is a gap between the fixing plate and the display screen.

11. The foldable mobile terminal according to claim 10, characterized in that: The edges of the fixing plate on opposite sides are respectively provided with a first notch and a second notch. In a closed state, the first rotating arm passes through the first notch, and the second rotating arm passes through the second notch.

12. The foldable mobile terminal according to claim 11, characterized in that: The first shell includes a first support plate and a first connecting plate fixedly connected to the first support plate, the first connecting plate is rotatably connected to the first rotating arm and is slidably connected to the first cover plate; the second shell includes a second support plate and a second connecting plate fixedly connected to the second support plate, the second connecting plate is rotatably connected to the second rotating arm and is slidably connected to the second cover plate.

13. The foldable mobile terminal according to claim 12, characterized in that: The first connecting plate is provided with a first sliding groove, the first cover plate is provided with a first guide rail, the first guide rail is accommodated in the first sliding groove and can slide in the first sliding groove, and the first support plate can drive the first cover plate to rotate relative to the supporting plate through the first connecting plate; the second connecting plate is provided with a second sliding groove, the second cover plate is provided with a second guide rail, the second guide rail is accommodated in the second sliding groove and can slide in the second sliding groove, and the second support plate can drive the second cover plate to rotate relative to the supporting plate through the second connecting plate.

14. The foldable mobile terminal according to claim 12, characterized in that: The first connecting plate includes a first body and a first boss integrally formed on the first body, and the second connecting plate includes a second body and a second boss integrally formed on the second body. In the unfolded state, the first boss is embedded in the first notch, and the second boss is embedded in the second notch.

15. The foldable mobile terminal according to claim 1, characterized in that: The foldable mobile terminal comprises a damping component, the damping component is connected to the folding mechanism, and when the foldable mobile terminal switches between an unfolded state and a folded state, the damping component can change the rotation damping of the housing component.

16. The foldable mobile terminal according to claim 15, characterized in that: The folding mechanism includes a first rotating shaft rotatably connected to a first side of the supporting plate, a second rotating shaft rotatably connected to a second side of the supporting plate, the first rotating arm is connected to the second rotating shaft, the second rotating arm is connected to the first rotating shaft, the damping assembly includes an elastic member, a movable cam and a fixed cam, the movable cam is slidably arranged on the first rotating shaft or the second rotating shaft, the fixed cam is arranged on the supporting plate, and the elastic member elastically abuts between the supporting plate and the movable cam so that the movable cam abuts against the fixed cam.

17. The foldable mobile terminal according to claim 16, characterized in that: A first protrusion is provided on a side of the movable cam facing the fixed cam, and a second protrusion is provided on a side of the fixed cam facing the movable cam. When the foldable mobile terminal switches between an unfolded state and a folded state, the first protrusion can slide on the second protrusion to change the squeezing force of the elastic member on the movable cam.

18. The foldable mobile terminal according to claim 1, characterized in that: The display screen is a flexible screen, and in a folded state, the display screen is sandwiched between the first shell and the second shell.

19. A foldable mobile terminal, characterized in that: include: Flexible screen; A shell assembly, comprising a first shell and a second shell, wherein the first shell and the second shell are respectively connected to the flexible screen, and the first shell and the second shell are respectively formed with installation spaces for installing electronic components of the foldable mobile terminal; and The folding mechanism comprises a carrying plate, a first cover plate, a second cover plate, a first rotating arm and a second rotating arm, wherein the first cover plate and the second cover plate are respectively rotatably connected to the carrying plate; two ends of the first rotating arm are respectively rotatably connected to the carrying plate and the first shell, and two ends of the second rotating arm are respectively rotatably connected to the carrying plate and the second shell; When the foldable mobile terminal switches between an unfolded state and a folded state, the first shell can drive the first cover plate to rotate relative to the supporting plate, and the first shell can slide and retract relative to the first cover plate; the second shell can drive the second cover plate to rotate relative to the supporting plate, and the second shell can slide and retract relative to the second cover plate; in the folded state, the orthographic projections of the first rotating arm and the second rotating arm on a reference plane intersect, and the reference plane is a geometric plane perpendicular to the rotation axis of the first cover plate.

20. The foldable mobile terminal according to claim 19, characterized in that: The folding mechanism includes a first rotating shaft and a second rotating shaft rotatably connected to the supporting plate, the first rotating arm is connected to the second rotating shaft, and the second rotating arm is connected to the first rotating shaft.

21. The foldable mobile terminal according to claim 20, characterized in that: The folding mechanism includes a third rotating shaft and a fourth rotating shaft connected to the supporting plate, and a first gear connected to the first rotating shaft, a second gear connected to the second rotating shaft, a third gear connected to the third rotating shaft, and a fourth gear connected to the fourth rotating shaft. The first gear and the fourth gear are respectively meshed with the third gear, and the second gear is meshed with the fourth gear. The first shell can drive the second gear to rotate through the first rotating arm, and the second shell can drive the first gear to rotate through the second rotating arm.

22. The foldable mobile terminal according to claim 19, characterized in that: The supporting plate is provided with a receiving groove. In a closed state, one end of the first rotating arm connected to the first shell extends out of the receiving groove, and one end of the second rotating arm connected to the second shell extends out of the receiving groove; in an expanded state, the first rotating arm and the second rotating arm are accommodated in the receiving groove.

23. The foldable mobile terminal according to claim 22, characterized in that: The folding mechanism includes a fixing plate fixedly connected to the carrying plate. In an unfolded state, the fixing plate abuts against the flexible screen. In a folded state, a gap exists between the fixing plate and the flexible screen.

24. The foldable mobile terminal according to claim 23, characterized in that: The edges of the fixing plate on opposite sides are respectively provided with a first notch and a second notch. In a closed state, the first rotating arm passes through the first notch, and the second rotating arm passes through the second notch.

25. The foldable mobile terminal according to claim 24, characterized in that: The first shell includes a first support plate and a first connecting plate fixedly connected to the first support plate, the first connecting plate is rotatably connected to the first rotating arm and is slidably connected to the first cover plate; the second shell includes a second support plate and a second connecting plate fixedly connected to the second support plate, the second connecting plate is rotatably connected to the second rotating arm and is slidably connected to the second cover plate.

26. The foldable mobile terminal according to claim 25, characterized in that: The first connecting plate is provided with a first sliding groove, the first cover plate is provided with a first guide rail, the first guide rail is accommodated in the first sliding groove and can slide in the first sliding groove, and the first support plate can drive the first cover plate to rotate relative to the supporting plate through the first connecting plate; the second connecting plate is provided with a second sliding groove, the second cover plate is provided with a second guide rail, the second guide rail is accommodated in the second sliding groove and can slide in the second sliding groove, and the second support plate can drive the second cover plate to rotate relative to the supporting plate through the second connecting plate.

27. The foldable mobile terminal according to claim 25, characterized in that: The first connecting plate includes a first body and a first boss integrally formed on the first body, and the second connecting plate includes a second body and a second boss integrally formed on the second body. In the unfolded state, the first boss is embedded in the first notch, and the second boss is embedded in the second notch.

28. The foldable mobile terminal according to claim 27, characterized in that: In the unfolded state, the side of the first body facing the flexible screen and the side of the second body facing the flexible screen are respectively flush with the side of the fixing plate facing the flexible screen.

29. The foldable mobile terminal according to claim 27, characterized in that: The first body is provided with a first groove, in which part of the structure of the first support plate is accommodated, and the side of the first support plate facing the flexible screen is flush with the side of the first body facing the flexible screen; the second body is provided with a second groove, in which part of the structure of the second support plate is accommodated, and the side of the second support plate facing the flexible screen is flush with the side of the second body facing the flexible screen.

30. The foldable mobile terminal according to claim 20, characterized in that: The foldable mobile terminal comprises a damping component, the damping component is connected to the folding mechanism, and when the foldable mobile terminal switches between an unfolded state and a folded state, the damping component can change the rotation damping of the housing component.

31. The foldable mobile terminal according to claim 30, characterized in that: The damping assembly includes a spring sleeved on the first rotating shaft, a movable cam sleeved on the first rotating shaft and capable of sliding along the first rotating shaft, and a fixed cam fixedly connected to the supporting plate; one end of the spring abuts against the first rotating shaft, and the other end abuts against the movable cam; when the foldable mobile terminal switches between the unfolded state and the folded state, the movable cam abuts against the fixed cam.

32. The foldable mobile terminal according to claim 31, characterized in that: A first protrusion is provided on a side of the movable cam facing the fixed cam, and a second protrusion is provided on a side of the fixed cam facing the movable cam. When the foldable mobile terminal switches between an unfolded state and a folded state, the first protrusion can slide on the second protrusion to change the squeezing force of the spring on the movable cam.

33. The foldable mobile terminal according to claim 19, characterized in that: The folding mechanism includes a baffle, which includes an integrally formed plate body and two pins, one of which passes through the supporting plate and the first cover plate, and the other of which passes through the supporting plate and the second cover plate; the first cover plate and the second cover plate are rotatably connected to the supporting plate via the pins respectively.

34. The foldable mobile terminal according to claim 19, characterized in that: In the folded state, the flexible screen is sandwiched between the first shell and the second shell.

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