CN115750576A

CN115750576A - Mobile terminal

Info

Publication number: CN115750576A
Application number: CN202111034349.3A
Authority: CN
Inventors: 张续续
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2021-09-03
Filing date: 2021-09-03
Publication date: 2023-03-07

Abstract

The utility model relates to a mobile terminal, including flexible screen and two center, but two center be rotatable coupling each other so that mobile terminal has outer book position and inflection position, the outside surface at two center is laid to the flexible screen, two center are provided with the pivot subassembly respectively at the junction, wherein, each pivot subassembly includes first pivot and drive mechanism, drive mechanism is connected with first pivot and center respectively, and drive mechanism configures to make mobile terminal in the in-process that outer book position and inflection position switch, the center can be close to or keep away from first pivot along the linear direction. Through the technical scheme, in the process of switching the mobile terminal from one folding position to another folding position, in order to adapt to different bending radiuses of the flexible screen under the two folding positions, the rotating shaft assembly drives the middle frame to move along a straight line, so that the flexible screen always has proper tension force, and excessive tension or looseness is avoided.

Description

Mobile terminal

Technical Field

The present disclosure relates to the field of electronic devices, and in particular, to a mobile terminal.

Background

With the continuous development of technology, people no longer satisfy mobile terminal devices with fixed screen sizes in order to adapt to different use scenes. The size of the screen can be changed in a folding manner in general, for example, in an unfolding state, the requirements of large-size multi-interface use in entertainment and office scenes can be met, and in a folding state, the conventional small-screen one-hand easy operation and quick information browsing can be realized. However, during the folding process of the mobile terminal, tension damage caused by the change of the curvature of the folded screen is a problem to be solved for such mobile terminal devices.

Disclosure of Invention

To overcome the problems in the related art, the present disclosure provides a mobile terminal.

According to a first aspect of the embodiments of the present disclosure, there is provided a mobile terminal, including: the mobile terminal comprises a flexible screen and two middle frames, wherein the two middle frames are rotatably connected with each other to enable the mobile terminal to have an outward folding position and an inward folding position, the flexible screen is laid on the outer side surfaces of the two middle frames, the two middle frames are respectively provided with a rotating shaft assembly at the joint, each rotating shaft assembly comprises a first rotating shaft and a transmission mechanism, the transmission mechanisms are respectively connected with the first rotating shaft and the middle frames, and the transmission mechanisms are configured to enable the middle frames to be close to or far away from the first rotating shaft along a linear direction in the switching process of the outward folding position and the inward folding position of the mobile terminal.

Optionally, the transmission mechanism includes a sliding support, and a gear set and a rack that are engaged with each other for transmission, the middle frame is slidably connected to the sliding support, the rack is fixedly disposed on the middle frame, the gear set is disposed on the sliding support, the transmission mechanism is configured to be integrally rotatable around an axis where the first rotating shaft is located, and the gear set and the rack are engaged with each other for transmission in a process of rotating around the first rotating shaft.

Optionally, the gear set includes a first gear, a second gear and a third gear, which are sequentially engaged and fixedly disposed on the sliding support, the first gear has a driving force for driving the second gear to rotate in the process of rotating around the first rotating shaft, and the third gear is respectively engaged with the second gear and the rack.

Optionally, the third gear includes a transmission portion configured in a disk shape for meshing with the second gear, and a swinging portion configured in a fan shape for meshing with the rack, the swinging portion being disposed offset along an end surface of the transmission portion.

Optionally, the sliding support includes a first mounting portion for mounting the middle frame, the first mounting portion is provided with a first bar-shaped groove extending along the moving direction of the middle frame, and the middle frame is provided with a first protruding block which is used for being matched with the first bar-shaped groove and capable of moving in the first bar-shaped groove.

Optionally, the sliding support still includes the second installation department, the edge is seted up to the second installation department the second bar-shaped groove that the direction of motion of center extends, the edge is seted up to the center the direction of motion of center extend and the position with the third bar-shaped groove that the second bar-shaped groove corresponds, the rack is provided with and is used for passing in proper order the second bar-shaped groove with the second lug in third bar-shaped groove.

Optionally, an elastic element is arranged between the sliding support and the middle frame, and the elastic element has an elastic force which enables the middle frame to be far away from the pushing of the sliding support.

Optionally, the rotating shaft assembly further includes two fourth gears engaged with each other, the fourth gears are rotatably sleeved on the first rotating shaft, the first gear includes a first engaging portion engaged with the second gear and a second engaging portion engaged with the fourth gear, and the second engaging portion is disposed along an end face of the first engaging portion in an offset manner.

Optionally, the mobile terminal further includes a first transfer plate and a second transfer plate respectively sleeved outside the two rotation shaft assemblies, and a third transfer plate sleeved outside the two fourth gears, and the first transfer plate and the third transfer plate are hinged to each other and the second transfer plate and the third transfer plate are hinged to each other.

Optionally, the mobile terminal is a folding screen mobile phone.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: the mobile terminal is provided with two folding positions capable of meeting different requirements of a user, and in the process that the mobile terminal is switched from the outward folding position to the inward folding position, the rotating shaft assembly drives the middle frame to move along a straight line so as to enable the flexible screen to have proper tension all the time and avoid excessive tension or looseness.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

FIG. 1 is a block diagram illustrating a mobile terminal in accordance with an exemplary embodiment, wherein the mobile terminal is in a folded-out position;

fig. 2 is a schematic view of the mobile terminal of fig. 1 with the flexible screen removed;

fig. 3 is a schematic structural view of the mobile terminal of fig. 2 after the rotating riding board is removed;

FIG. 4 is a front view of the spindle assembly shown in accordance with an exemplary embodiment;

FIG. 5 is a rear view of the spindle assembly shown in accordance with an exemplary embodiment;

FIG. 6 is an enlarged partial schematic view of FIG. 5;

FIG. 7 is a schematic diagram illustrating a third gear according to an exemplary embodiment;

FIG. 8 is a schematic structural view of a rack shown in accordance with an exemplary embodiment;

FIG. 9 is a schematic structural view of a sliding bracket shown in accordance with an exemplary embodiment;

FIG. 10 is a schematic view of the assembly of the middle frame and the sliding support shown in accordance with an exemplary embodiment;

FIG. 11 is a schematic view of the assembly of the middle frame and the sliding support of FIG. 10 at another angle;

FIG. 12 is a simplified schematic diagram of a mobile terminal shown in a folded-out position in accordance with an exemplary embodiment;

fig. 13 is a simplified schematic illustration of a mobile terminal shown in a folded-in position according to an example embodiment.

Description of the reference numerals

1-flexible screen, 2-middle frame, 21-first lug, 22-third strip-shaped groove, 3-rotating shaft component, 31-first rotating shaft, 32-transmission mechanism, 321-first gear, 3211-first meshing part, 3212-second meshing part, 322-second gear, 323-third gear, 3231-transmission part, 3232-swinging part, 324-rack, 3241-rack part, 3242-second lug, 3243-elastic member first mounting seat, 3244-anchoring point, 33-sliding support, 331-first mounting part, 3311-first strip-shaped groove, 332-second mounting part, 3321-second strip-shaped groove, 3322-elastic member second mounting seat, 34-fourth gear, 35-elastic member, 36-second rotating shaft, 37-swinging arm, 41-first rotating plate, 42-second rotating plate, 43-third rotating plate.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

Unless otherwise specified, use of the terms of orientation such as "upper, lower, left, right" are defined according to the directions indicated in the respective drawings, and "inner" and "outer" refer to the inner and outer of the contours of the respective parts themselves. Furthermore, the terms "first," "second," and the like, as used herein, are intended to distinguish one element from another, and not necessarily to distinguish between order and importance.

As shown in fig. 1 to 13, the present disclosure provides a mobile terminal, which includes, but is not limited to, an electronic device such as a mobile phone, a notebook computer, and a tablet computer, and in particular, an electronic device having a foldable screen. The mobile terminal comprises a flexible screen 1, two middle frames 2. Wherein, two middle frames 2 are rotatably connected with each other to make the mobile terminal have a folded-out position and a folded-in position, and the flexible screen 1 is laid on the outer side surfaces of the two middle frames 2. Fig. 12 and 13 are schematic views of the mobile terminal in a folded-out position and a folded-in position, respectively, in which the two middle frames 2 are folded in half and the flexible screen 1 is exposed out of the mobile terminal, and at this time, the folding radius of the flexible screen is represented as R1; in the folded position, the two middle frames 2 are folded in half, and the flexible screen is hidden in the mobile terminal, and at this time, the folding radius of the flexible screen is represented as R2. Different folding positions that mobile terminal has can satisfy user's different demands, for example, in the position of rolling over outward, can realize that conventional miniaturized one-hand operation is information quick browse, at the internal position, can form the protection or be equipped with the functional component that the degree of dependence is little to the screen to flexible screen 1.

It can be known through comparison that the folding radius R1 corresponding to the fold-out position is greater than the folding radius R2 corresponding to the fold-in position, because the overall dimension of the flexible screen 1 is constant, the flexible screen 1 is in an over-tensioned state due to a large folding radius at the fold-out position, and the flexible screen 1 is in an over-relaxed state due to a small folding radius at the fold-in position, so that the flexible screen needs to have a proper tension all the time in the switching process of the two folding positions. For this reason, the mobile terminal of the present disclosure is provided with two rotating shaft assemblies 3 at the junction of two middle frames 2, and one middle frame 2 is correspondingly connected with one rotating shaft assembly 3 respectively. Each rotating shaft assembly 3 comprises a first rotating shaft 31 and a transmission mechanism 32, and the transmission mechanism 32 is connected with the first rotating shaft 31 and the middle frame 2 respectively. The transmission mechanism 32 is configured to enable the middle frame 2 to approach or move away from the first rotating shaft 31 in a linear direction during the switching process of the mobile terminal between the folded-out position and the folded-in position.

It should be understood that, in order to improve the stability of the transmission, a plurality of sets of the rotating shaft assemblies 3 may be provided at a plurality of positions at the junction of the center frames 2, for example, fig. 2 and 3 are shown with the rotating shaft assemblies 3 provided at both ends along the turning axis. Of course, the rotating shaft assemblies 3 may not be limited to two sets, and are specifically configured according to actual needs.

In the process of switching the mobile terminal between the fold-out position and the fold-in position, the dynamic balance of the tension of the flexible screen 1 is realized through the movement of the middle frame 2. For example, in the process of switching from the inward folding position to the outward folding position, the folding radius is gradually increased, the tension applied to the flexible screen 1 is also gradually increased, at this time, the middle frame 2 is close to the first rotating shaft 31 along the linear direction, and then the flexible screen 1 originally in the over-tensioned state is driven to be restored to the proper tensioned state. The principle of switching from the outward folding position to the inward folding position is the same as that described above, but the process is the reverse, and the description is omitted here. It should be noted that, between the two folded states, there is also an unfolded state to satisfy the user's requirement for large screen display.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: the mobile terminal is provided with two folding positions capable of meeting different requirements of a user, in the process that the mobile terminal is switched from the outward folding position to the inward folding position, in order to adapt to different bending radiuses of the flexible screen 1 at the two folding positions, the rotating shaft assembly 3 drives the middle frame 2 to move along a straight line, specifically, the transmission mechanism 32 drives the middle frame 2 to be close to or far away from the first rotating shaft 31 along the straight line direction, so that the flexible screen 1 always has proper tensioning force, and excessive tensioning or looseness is avoided.

The present disclosure is not limited to the embodiment in which the transmission mechanism 32 drives the middle frame 2 to move in the linear direction, and any structure or method capable of achieving this function can be applied to the present disclosure. According to an embodiment of the present disclosure, referring to fig. 4 to 6, the transmission mechanism 32 may include a sliding bracket 33, and a gear set and a rack 324 engaged with each other, the middle frame 2 is slidably connected to the sliding bracket 33, the rack 324 is fixedly disposed on the middle frame 2, and the gear set is disposed on the sliding bracket 33. It should be noted that the position of the sliding bracket 33 in the linear direction relative to the first rotating shaft 31 is fixed, that is, the sliding bracket 33 does not approach or move away from the first rotating shaft 31 with the switching of the folding position, and the middle frame 2 is slidably mounted on the sliding bracket 33 relative to the sliding bracket 33. The transmission mechanism 32 is configured to be rotatable integrally about the axis of the first rotation shaft 31, and the gear set and the rack 324 are in meshing transmission with each other during rotation about the first rotation shaft 31.

To illustrate, the transmission mechanism 32 can integrally revolve around the axis of the first rotating shaft 31 during the process of switching the folding position of the mobile terminal, and meanwhile, the gears of the gear set are engaged with each other through rotation, and the gear at the tail end of the gear set is engaged with the rack 324. Since the rack 324 is fixedly arranged on the middle frame 2, the middle frame 2 connected with the rack 324 can be driven to move together in the process that the rack 324 is driven by the gear set. Besides the use of a rack gear to transmit power, in other embodiments, the transmission mechanism 32 may also use a four-bar linkage mechanism, for example, which can also achieve the purpose of driving the middle frame 2 to approach or move away from the first rotating shaft 31 in a linear direction, and will not be described in detail herein.

With continued reference to fig. 4 to 6, the gear set may include a first gear 321, a second gear 322, and a third gear 323 sequentially engaged and fixedly disposed on the sliding bracket 33, the first gear 321 has a driving force for driving the second gear 322 to rotate during the rotation process around the first rotating shaft 31, and the third gear 323 is engaged with the second gear 322 and the rack 324, respectively. In order to improve the reliability of meshing transmission of all gears in the gear set, two adjacent gears can be connected through a swing arm 37.

The first gear 321 has a function of driving a gear to provide power for the operation of the whole gear set, and the power source of the first gear 321 may be generated by meshing with the fourth gear 34 in the following embodiments during the folding process, or a long shaft which can rotate during the folding process may be provided on the first gear 321, and the first gear 321 is sleeved and can rotate together with the long shaft. For example, when the folded position is switched from the folded-in position to the folded-out position, as shown in fig. 4 to 6, the first gear 321 rotates counterclockwise, the second gear 322 engaged therewith rotates clockwise, and the third gear 323 engaged with the second gear 322 rotates clockwise, and the rack 324 engaged with the third gear 323 is driven to move in a linear direction by the rotation of the third gear 323.

As shown in fig. 7, the third gear 323 may include a transmission portion 3231 configured in a disc shape for engaging with the second gear 322, and a swing portion 3232 configured in a fan shape for engaging with the rack 324, the swing portion 3232 being disposed offset along an end surface of the transmission portion 3231. This design for the third gear 323 enables the same gear to achieve both meshing with the adjacent second gear 322 and driving the rack 324, so as to reduce the number of parts required, save space occupied, and provide the possibility of further reducing the thickness of the mobile terminal. In addition, the adjustment of the movement distance of the driving rack 324 can be realized according to the arc length design of the swinging part 3232. The transmission portion 3231 and the swinging portion 3232 may be integrally formed by injection molding or the like, or may be assembled by two separate components, which is not limited herein.

As an embodiment capable of achieving the sliding connection of the sliding bracket 33 and the middle frame 2, referring to fig. 9 to 11, the sliding bracket 33 may include a first mounting portion 331 for mounting the middle frame 2, the first mounting portion 331 being opened with a first bar-shaped groove 3311 extending in a moving direction of the middle frame 2, and the middle frame 2 being provided with a first protrusion 21 for being engaged with the first bar-shaped groove 3311 and being movable in the first bar-shaped groove 3311. Here, the first bar-shaped groove 3311 and the first protrusion 21 function like a slide rail and a slider, and the first protrusion 21 is inserted into the first bar-shaped groove 3311 and can slide in a linear direction in the first bar-shaped groove 3311, that is, the first bar-shaped groove 3311 provides a restriction space for the sliding of the first protrusion 21, thereby restricting the moving direction of the entire center frame 2. In addition, the length of the first bar-shaped slot 3311 may be designed to limit the sliding distance of the middle frame 2, as shown in fig. 4 to 6, when the mobile terminal is in the folded-out position, the middle frame 2 is located at the right extreme position. Likewise, it is possible to design the middle frame 2 to be in the extreme position right when the mobile terminal is in the folded-in position.

Further, the sliding support 33 may further include a second mounting portion 332, the second mounting portion 332 is provided with a second strip-shaped groove 3321 extending along the moving direction of the middle frame 2, the middle frame 2 is provided with a third strip-shaped groove 22 extending along the moving direction of the middle frame 2 and corresponding to the second strip-shaped groove 3321, and the rack 324 is provided with a second protrusion 3242 for sequentially passing through the second strip-shaped groove 3321 and the third strip-shaped groove 22. As shown in fig. 8, the rack 324 may be configured in a bar shape, and the second projection 3242 and the rack portion 3241 for engaging with the third gear 323 are integrally formed in the bar. Wherein the rack portion 3241 is formed on the bottom surface of the bar and the second projection 3242 is formed on the side surface. Since the second protrusion 3242 is configured to be inserted in a direction perpendicular to the strip-shaped groove, and therefore has a tendency to slide along an extending direction of the strip-shaped groove with respect to the strip-shaped groove, in order to relatively fix the position of the rack 324 with respect to the middle frame 2, an anchoring point 3244 may be provided, which includes a bar formed on the rack and a slot formed on the middle frame 2, and the bar is inserted into the slot in a direction perpendicular to the extending direction of the strip-shaped groove, so that the fixed connection of the middle frame 2 and the rack 324 can be realized by the cooperation of the second protrusion 3242 and the anchoring point 3244 without affecting the movement of the middle frame with respect to the sliding bracket 33.

An elastic member 35 may be disposed between the sliding bracket 33 and the middle frame 2, and the elastic member 35 has an elastic force urging the middle frame 2 away from the sliding bracket 33. Alternatively, the elastic member 35 may be a compression spring. To facilitate the installation of the elastic member 35, as shown in fig. 9 and 10, an elastic member second installation seat 3322 is provided on the sliding bracket 33, and correspondingly, an elastic member first installation seat 3243 is provided on the rack 324, and the elastic member 35 is interposed between the first installation seat 3243 and the second installation seat 3322 after the assembly. Can provide the helping hand for mobile terminal switches from a folding position to another folding position through being provided with elastic component 35, it is more light laborsaving during folding. Further, the number of parts can be reduced by forming the mounting portion for mounting the elastic member 35 by the slide holder 33 and the rack 324, respectively.

In order to enable the two middle frames 2 to rotate synchronously, according to an embodiment of the present disclosure, as shown in fig. 4 to 6, the rotating shaft assembly 3 may further include two fourth gears 34 engaged with each other, the fourth gears 34 may be rotatably sleeved on the first rotating shaft 31, where the two fourth gears 34 function as synchronous gears, so that the two middle frames 2 can rotate synchronously. The first gear 321 includes a first meshing portion 3211 for meshing with the second gear 322 and a second meshing portion 3212 for meshing with the fourth gear 34, the second meshing portion 3212 being disposed offset along an end surface of the first meshing portion 3211. Like the third gear 323, the first gear 321 is designed to be able to mesh with the second gear 322 and drive the fourth gear 34 to rotate, thereby reducing the number of parts required.

When the mobile terminal is switched from one folding position to another folding position, the specific transmission process is as follows: the gear set including the first gear 321 "revolves" around the first rotation axis 31 as a whole, and the "rotation" of the first gear 321 drives the second gear 322 and the fourth gear 34 to rotate, so that the two middle frames 2 can synchronously rotate through meshing transmission between the two fourth gears 34.

As shown in fig. 3, the fourth gear 34 is sleeved on the first rotating shaft 31, the first gear 321 is sleeved on the second rotating shaft 36, and such first rotating shaft 31 and second rotating shaft 36 can be regarded as mounting shafts, which are not used for realizing the self-rotation around the shaft. Referring also to fig. 2, the mobile terminal may further include a first transfer board 41 and a second transfer board 42 respectively fitted over the two rotary shaft assemblies 3, and a third transfer board 43 fitted over the two fourth gears 34, wherein the first transfer board 41 and the third transfer board 43 and the second transfer board 42 and the third transfer board 43 are hinged, that is, the two middle frames 2 are structurally and rotatably connected as a whole terminal by the hinged transfer boards. The rotary boards can be hinged through a hinge structure. Referring to fig. 5 and 6 together, both end portions of the turning plate are folded and wound around the rotation shaft, for example, both end portions of the first turning plate 41 and the second turning plate 42 are folded and wound around the first rotation shaft 31 and the second rotation shaft 36, respectively, and both end portions of the third turning plate 43 are folded and wound around the adjacent two first rotation shafts 31, respectively.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A mobile terminal, characterized in that the mobile terminal comprises: the mobile terminal comprises a flexible screen (1) and two middle frames (2), wherein the two middle frames (2) are rotatably connected with each other to enable the mobile terminal to have an outward folding position and an inward folding position, the flexible screen (1) is laid on the outer side surfaces of the two middle frames (2), the two middle frames (2) are respectively provided with a rotating shaft assembly (3) at the connection position, each rotating shaft assembly (3) comprises a first rotating shaft (31) and a transmission mechanism (32), the transmission mechanisms (32) are respectively connected with the first rotating shaft (31) and the middle frames (2), and the transmission mechanisms (32) are configured to enable the middle frames (2) to be close to or far away from the first rotating shaft (31) along a straight line direction in the process of switching the outward folding position and the inward folding position of the mobile terminal.

2. The mobile terminal according to claim 1, wherein the transmission mechanism (32) comprises a sliding bracket (33), and a gear set and a rack (324) which are in meshing transmission, the middle frame (2) is slidably connected with the sliding bracket (33), the rack (324) is fixedly arranged on the middle frame (2), the gear set is arranged on the sliding bracket (33), the transmission mechanism (32) is configured to be capable of rotating around an axis of the first rotating shaft (31) as a whole, and the gear set and the rack (324) are in meshing transmission with each other in the process of rotating around the first rotating shaft (31).

3. The mobile terminal according to claim 2, wherein the gear set comprises a first gear (321), a second gear (322) and a third gear (323) which are sequentially engaged and fixedly arranged on the sliding bracket (33), the first gear (321) has a driving force for driving the second gear (322) to rotate in the process of rotating around the first rotating shaft (31), and the third gear (323) is respectively engaged with the second gear (322) and the rack (324).

4. The mobile terminal according to claim 3, wherein the third gear (323) comprises a transmission portion (3231) configured in a disc shape for engaging with the second gear (322), and a swinging portion (3232) configured in a fan shape for engaging with the rack (324), the swinging portion (3232) being disposed offset along an end surface of the transmission portion (3231).

5. The mobile terminal according to claim 2, characterized in that the sliding bracket (33) comprises a first mounting portion (331) for mounting the middle frame (2), the first mounting portion (331) defining a first linear slot (3311) extending in a direction of movement of the middle frame (2), the middle frame (2) being provided with a first protrusion (21) for cooperating with the first linear slot (3311) and being movable in the first linear slot (3311).

6. The mobile terminal of claim 5, wherein the sliding bracket (33) further comprises a second mounting portion (332), the second mounting portion (332) defines a second strip-shaped groove (3321) extending along the moving direction of the middle frame (2), the middle frame (2) defines a third strip-shaped groove (22) extending along the moving direction of the middle frame (2) and corresponding to the second strip-shaped groove (3321), and the rack (324) is provided with a second protrusion (3242) for sequentially passing through the second strip-shaped groove (3321) and the third strip-shaped groove (22).

7. The mobile terminal according to claim 2, wherein an elastic member (35) is disposed between the sliding support (33) and the middle frame (2), and the elastic member (35) has an elastic force urging the middle frame (2) away from the sliding support (33).

8. The mobile terminal of claim 3, wherein the rotation shaft assembly (3) further comprises two mutually meshed fourth gears (34), the fourth gears (34) are rotatably sleeved on the first rotation shaft (31), the first gear (321) comprises a first meshing portion (3211) for meshing with the second gear (322) and a second meshing portion (3212) for meshing with the fourth gear (34), and the second meshing portion (3212) is arranged along an end face of the first meshing portion (3211) in an offset manner.

9. The mobile terminal according to claim 8, further comprising a first rotary board (41) and a second rotary board (42) respectively fitted over the two rotary shaft assemblies (3), and a third rotary board (43) fitted over the two fourth gears (34), wherein the first rotary board (41) and the third rotary board (43) are hinged to each other, and the second rotary board (42) and the third rotary board (43) are hinged to each other.

10. The mobile terminal of claim 1, wherein the mobile terminal is a folding screen handset.