mobile terminal

Abstract

This application provides a mobile terminal, including a first housing and a second housing. The first housing has an arcuate portion, and a connecting member is disposed between the first housing and the second housing. The connecting member includes two or more connecting parts, which are rotatably connected. Multiple connecting parts are arranged sequentially along a first direction H. A flexible screen covers the first housing, the connecting member, and the second housing. When transitioning from a flattened state to a folded state, the second housing drives the multiple connecting parts of the connecting member to rotate to cover at least a portion of the arcuate portion. A locking member connects the multiple connecting parts. When the locking member is locked, it restricts the rotation between the connecting parts to maintain the flattened or folded state. When the locking member is released, adjacent connecting parts can rotate. The mobile terminal provided by this application satisfies the requirements of being foldable for portability and unfolded to have a large screen effect, while also achieving a slim and compact design.

Description

Technical Field

[0001] This application relates to the field of electronic product technology, and more particularly to a mobile terminal. Background Technology

[0002] In the mobile communication device market, the emergence of foldable phones allows them to be folded down to the size of traditional phones, making them easy to carry in pockets and bags. When in use, they can be unfolded to create a larger screen for convenient use. However, existing foldable phones generally achieve this folding mechanism through a hinge mechanism. This hinge mechanism occupies a significant amount of internal space, requiring a large internal space to accommodate the hinge mechanism and related electronic components. This results in a thicker phone even before folding, and an even greater thickness and weight after folding, failing to meet users' demands for a slim and compact foldable phone. Summary of the Invention

[0003] The purpose of this application is to provide a mobile terminal that can be folded for easy carrying, unfolded to have a large screen effect, and at the same time achieve the characteristics of being lightweight and compact.

[0004] This application provides a mobile terminal, including a first housing and a second housing. The first housing has an arcuate portion, and a connecting member is provided between the first housing and the second housing. The connecting member includes two or more connecting parts, which are rotatably connected. Multiple connecting parts are arranged sequentially along a first direction H, which is the extension direction between the first housing and the second housing. A flexible screen is covered on the first housing, the connecting member, and the second housing. The mobile terminal includes at least a flattened state and a folded state. When transitioning from the flattened state to the folded state, the second housing drives the multiple connecting parts of the connecting member to rotate to cover at least part of the arcuate portion. The folding design is achieved by using rotating connecting parts to cover the arcuate portion instead of a traditional hinge structure. Because the structure of the rotating connection between the connecting parts is relatively simple, it satisfies the requirements of easy portability in the folded state and a large screen in the flattened state, while avoiding the connecting parts occupying the internal space of the first and second housings. Furthermore, a locking member restricts the rotation between the connecting parts to control the mobile terminal to maintain either the flattened state, the folded state, or a transition between the two states. When the locking component is locked, it can restrict the relative rotation between the connecting parts, thus keeping the mobile terminal in a flat or folded state. When the locking component is unlocked, since there is no longer a restriction from the locking component, the connecting parts can rotate relative to each other, so the mobile terminal can be freely controlled to switch between the flat and folded states. Thus, by setting the locking component on multiple connecting parts, the structural stability of the mobile terminal in the flat and folded states is ensured.

[0005] In one possible design, the locking component has at least a first stable state and a second stable state, and the locking component can switch between the first stable state and the second stable state; the first stable state of the locking component is that it can overcome its own weight and the weight of the connecting part or other forces, and when it can withstand a force within a first preset range, it can maintain the locking component in a straight fixed form, thereby supporting the connecting part to make the flexible screen flat and the mobile terminal maintain a flat state; the second stable state is that it can overcome its own weight and the weight of the connecting part or other forces, and when it can withstand a force within a second preset range, it can maintain the locking component in a bent fixed form, thereby supporting the connecting part to make the flexible screen bend and the mobile terminal maintain a folded state. The forces within the first and second preset ranges are the forces that can be withstood while maintaining the first and second stable states, respectively. Within these ranges, the locking component can maintain the first and second stable states. When the applied force exceeds the forces within the preset range, the corresponding stable state is disrupted, causing the mobile terminal to switch between a flattened state and a folded state. When the mobile terminal is finally switched to a flattened or folded state, the locking component can return to the first or second stable state after the applied force is removed. For example, when the mobile terminal is in a flattened state, the corresponding locking component has a first stable state, which can support the connecting part and the flexible screen to maintain the mobile terminal in a flattened state. When an external force is applied to the second housing, causing the second housing to rotate relative to the first housing, the external force is greater than the force within the first preset range under the first stable state, disrupting the fixed shape of the locking component under the first stable state. The locking component releases the restriction on the connecting part, thereby enabling the mobile terminal to switch from a flattened state to a folded state. When transitioning to the folded state, the locking component is in a fixed position under the second stable state. Upon removal of external force, the force on the locking component returns to a second preset range, thus maintaining the locking component in its fixed position under the second stable state. This supports the connecting parts, keeps the flexible screen in a bent state, and maintains the mobile terminal in a folded state. Furthermore, when the locking component is in the first and second stable states respectively, the mobile terminal can maintain a flattened state and a folded state respectively. When the locking component is adjusted to the first stable state, it restricts rotation between the connecting parts, keeping the mobile terminal in a flattened state. During folding, the first stable state of the locking component is disrupted, allowing relative rotation between the connecting parts. When the locking component is adjusted to the second stable state, it maintains and restricts rotation between the connecting parts, keeping the mobile terminal in a folded state. By changing the stable state of the locking component, the movement between the connecting parts is restricted, allowing the mobile terminal to accurately maintain the corresponding flattened or folded state.

[0006] In one possible design, multiple connecting parts have a first slot on the side facing away from the flexible screen, and the first slots of the multiple connecting parts are connected along a first direction H. The locking component passes through the multiple first slots. When the locking component connects the multiple connecting parts, in order to reduce the space occupied when the two are engaged, and to improve the linkage between the locking component and the connecting parts, so as to ensure the stability of the mobile terminal when folding and flattening, the locking component is passed through the multiple first slots.

[0007] In one possible design, the two ends of the locking component extend into the first housing and the second housing, respectively. The first housing and the second housing are each provided with a second slot for accommodating the ends of the locking component. By inserting the two ends of the locking component into the second slots on different housings, the ends of the locking component will not disengage from the second slots when the mobile terminal is unfolded and folded. This prevents the relative position of the locking component from changing during repeated unfolding and folding operations, and avoids the locking component easily detaching from a connecting part, thus preventing it from effectively restricting rotation between the connecting parts.

[0008] In one possible design, the locking component is a spring structure. This spring structure can elastically deform under external force. When the locking component connects multiple connecting parts, it can simultaneously act on multiple connecting parts in both the flattened and folded states due to its own elastic force. In the flattened state, the locking component can elastically deform to a first steady state, providing support for the connecting parts and restricting rotation between them, thus maintaining the flattened state. In the folded state, the locking component can elastically deform to a second steady state, providing support for the bent connecting parts, preventing relative rotation between them. The transition between the flattened and folded states is achieved simply by driving the locking component to deform to the other steady state through external force. This allows for control of flattening or folding by changing the steady state of the locking component under external force, resulting in a simple structure and easy operation.

[0009] In one possible design, in the first stable state, the locking component is an arc-shaped structure. The two ends of the locking component extending along a second direction M perpendicular to the first direction H gradually approach the flexible screen, and the locking component provides resistance to the transition from the first stable state to the second stable state. In the second stable state, the locking component is a U-shaped structure, with the opening of the U-shape facing the arc portion, and the locking component provides resistance to the transition from the second stable state to the first stable state. When it is necessary to convert the mobile terminal from a flattened state to a folded state, an external force is needed to overcome the internal stress (resistance) that maintains the arc shape, allowing the locking component to bend along the first direction H, making the arc of the arc structure more gradual and deforming it into a straight line. This achieves the bending of the connecting component, and the locking component moves to form the second stable state, while the mobile terminal remains in the folded state. In this folded state, because the spring is in a straight state where the arc has gradually flattened to a straight line, it is difficult for it to return to the arc shape. At this time, corresponding internal stress (resistance) is generated acting on the bent connecting part, preventing relative rotation between the connecting parts, thus maintaining the folded state. When switching between the flattened and folded states, it is only necessary to overcome the internal stress (resistance) of the spring in the straight and curved structure by external force. Thus, through the cooperation of this simple structure, the locking component 32 can be maintained between the first stable state, the second stable state, or both stable states, so as to fold or unfold as needed. The structure has good stability, is easy to operate, and has low cost.

[0010] In one possible design, the locking component is made of shape memory alloy. The locking component includes a temperature regulating unit that adjusts the temperature of the shape memory alloy. The locking component transitions between a first stable state and a second stable state based on temperature changes. The shape memory alloy is pre-programmed to remember a flat, flat state and a folded, rolled-up state. The temperature regulating unit's action on the locking component causes a temperature change, allowing the shape memory alloy locking component to transition between these two remembered states. This structure is simple; by controlling temperature changes, the locking component can perform corresponding actions to maintain the flat, folded, and transitioning states. It is convenient to operate and does not occupy much internal space.

[0011] In one possible design, the locking component includes a first component and a second component. The first component connects multiple connecting parts. Along a first direction H, the first component has a first end and a second end. The first end is fixedly connected to a second housing, and the second end is movably connected to a second slot in the first housing. The second component is fixedly connected to the second slot in the first housing, and its second end is located on the side of the second component away from the connecting parts. When the second component and the second end of the first component abut, there is a binding force between the second component and the second end to restrict the rotation of adjacent connecting parts. During the transition from a flattened state to a folded state, an external force overcomes the binding force between the second component and the second end, causing the second housing to rotate around the first housing, and the second end to move away from the second component, allowing adjacent connecting parts to rotate to the folded state. In the flattened state, the stretching of the first component brings the connecting parts closer together, restricting their rotation. The cooperation of the first and second components maintains the first component in a stretched state, thereby maintaining the flattened state. When folding is required, the cooperation between the first and second components is released, allowing the first component to release the restriction on the connecting parts, thus enabling relative rotation between the connecting parts to achieve folding. In order to keep the product in a folded state, magnetic components can be provided in the first and second housings as described above, so that the product can be kept in a folded state by the attraction between the two (the resulting binding force).

[0012] In one possible design, the first component and the second component are magnetic. The first and second components are brought together by attraction to maintain a flattened state. In the flattened state, the second ends of the second components are magnetically engaged, and the tension of the first component supports the connecting parts, keeping them flat. When transitioning from the flattened state to a folded state, it is only necessary to push the second housing towards the first housing along the first direction H while simultaneously applying a folding force (a force rotating along the positive direction L) to the second housing. During this process, the movement of the second housing relative to the first housing pushes the second end away from the second component, releasing the attraction between the second end and the second component. Without the restriction of the locking component, the connecting parts can rotate relative to each other, thus achieving folding.

[0013] In one possible design, the connecting part includes a rotating pin and a connecting hole. In two adjacent connecting parts, the rotating pin of one is rotatably connected to the connecting hole of the other, and there is a fitting clearance between the rotating pin and the connecting hole. By setting the rotating pin, when the mobile terminal is folded, adjacent connecting parts can rotate relative to each other about the axis of the rotating pin. The rotating pin can move under the bending force (external force) of folding, thereby achieving the folding state required by the mobile terminal. Simultaneously, the locking member connected to the connecting part also moves to transition to a second stable state. The locking member restricts the rotation between the connecting parts, thus maintaining the folded state. When it is necessary to change the mobile terminal from the folded state to the flattened state, simply release the locking member, disrupting the second stable state of the locking member, allowing the locking member to move with the rotation between the connecting parts. When the locking member moves to the first stable state, it locks, restricting the rotation between the connecting parts, and the mobile terminal is now in the flattened state. By using multiple connecting parts and a rotating pin that rotatably connects adjacent connecting parts, the connecting parts can rotate relative to each other under the action of external force, thereby achieving bending and flattening.

[0014] In one possible design, the connecting part includes a first part and a second part, with the second part located above the first part, forming a stepped structure. The first part has a first abutting surface, and the second part has a second abutting surface. In the flattened state, the first abutting surface of one of two adjacent connecting parts abuts against the second abutting surface of the other. By providing the first and second abutting surfaces, at least some overlap can be achieved between two adjacent connecting parts in the flattened state. The mating first and second abutting surfaces restrict the rotation direction between the connecting parts from the opposite direction, thereby limiting the folding direction to one direction in the flattened state. When the folded mobile terminal needs to be flattened, it can be returned to its original position to achieve the flattened state, thus improving the structural stability of the connecting components, avoiding damage to mating parts caused by multi-directional folding, and increasing service life.

[0015] In one possible design, in two adjacent connecting parts, the first part of one part has a limiting protrusion, and the second part of the other part has a limiting groove. When the first and second housings are rotated to the folded state, the limiting protrusion and the limiting groove cooperate to restrict the rotation between adjacent connecting parts. Thus, the cooperation of the limiting protrusion and the limiting groove restricts the rotation between the connecting parts after reaching the folded position, and also provides support for the connecting components to keep the flexible screen in this part taut and prevent wrinkles from forming. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a mobile terminal in a folded state, provided in an embodiment of this application;

[0017] Figure 2 for Figure 1 A schematic diagram of the mobile terminal in its flattened state;

[0018] Figure 3 for Figure 1 A schematic diagram of the mobile terminal in its flattened state from another direction;

[0019] Figure 4 This is a schematic diagram of another mobile terminal in a folded state provided in an embodiment of this application;

[0020] Figure 5 for Figure 4 A schematic diagram of the mobile terminal in its flattened state;

[0021] Figure 6 for Figure 1 An exploded view of the mobile terminal in its flattened state;

[0022] Figure 7 for Figure 1 A partial cross-sectional structural diagram of a mobile terminal in a flattened state;

[0023] Figure 8 A front view of a mobile terminal in a flattened state is provided in an embodiment of this application;

[0024] Figure 9 for Figure 8 A partial cross-sectional structural diagram of a mobile terminal in its folded state;

[0025] Figure 10 for Figure 8 The main view of the mobile terminal in the collapsed state;

[0026] Figure 11 This is a schematic diagram of the structure of the connecting part provided in an embodiment of this application;

[0027] Figure 12 for Figure 11 Enlarged view of part A in the middle;

[0028] Figure 13 A schematic diagram of the flattened state structure of a mobile terminal without a flexible screen, as provided in an embodiment of this application;

[0029] Figure 14 for Figure 13 Enlarged view of part B in the middle section;

[0030] Figure 15 for Figure 13 A schematic diagram of the folded state structure of a mobile terminal without a flexible screen;

[0031] Figure 16 for Figure 15 Enlarged view of part C in the middle;

[0032] Figure 17 This is a schematic diagram of a locking component in a first steady state, provided as an embodiment of this application.

[0033] Figure 18 This is a schematic diagram of a locking component in a second steady state, provided as an embodiment of this application.

[0034] Figure 19 A front view of another locking component provided in this application in its flattened state when connected to a mobile terminal;

[0035] Figure 20 for Figure 19 The main view of the folded state when the locking component is connected to the mobile terminal;

[0036] Figure 21 A front view of another locking component provided in this application in its flattened state when connected to a mobile terminal;

[0037] Figure 22 for Figure 21 The main view of the device in its folded state when the locking component is connected to the mobile terminal.

[0038] Figure label:

[0039] 1-First housing; 11-Groove; 12-Arc portion; 2-Flexible screen; 3-Connecting component; 31-Connecting part; 311-Rotating pin; 312-Connecting hole; 313-First slot; 314-First part; 315-Second part; 316-Guide surface; 317-Limiting protrusion; 318-Limiting groove; 319-Second abutting surface; 310-First abutting surface; 32-Locking component; 33-First component; 331-First end; 332-Second end; 34-Second component; 35-Memory alloy; 4-Second housing. Detailed Implementation

[0040] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0041] One embodiment of this application provides a mobile terminal, such as... Figure 1 , Figure 2 and Figure 3 As shown, where, Figure 1 This is a structural diagram of a mobile terminal in a folded state. Figure 2This is a structural diagram illustrating how a mobile terminal can be changed to a flattened state. Figure 3 This is a schematic diagram of the mobile terminal's structure in another direction when it is in a flattened state. (Example) Figure 1 and Figure 2 As shown, the mobile terminal includes a first housing 1 and a second housing 4, with a flexible screen 2 covering the upper surfaces of the first housing 1 and the second housing 4. For ease of use, a large screen is required for operation; therefore, the first housing 1 and the second housing 4 must ensure that all parts of the flexible screen 2 are on the same plane, allowing the flexible screen 2 to be flattened within the plane. At this time, the first housing 1 and the second housing 4 are arranged sequentially on the same horizontal plane, and the mobile terminal is in a flattened state. To facilitate portability and reduce the area occupied by the large screen, the second housing 4 can be driven to move, causing the flexible screen 2 connected to it to rotate relative to the first housing 1. This allows the second housing 4 to at least partially cover the outer surface of the first housing 1, and simultaneously, a portion of the flexible screen 2 also covers the outer surface of the first housing 1 along with the second housing 4. This causes a portion of the flexible screen 2, which originally had a large screen effect, to be folded up and attached to the outer surface of the first housing 1, reducing the area occupied by the flexible screen 2. At this time, the mobile terminal is in a folded state. Therefore, the mobile terminal is designed with a foldable structure that allows it to be folded and unfolded, thus enabling it to have a folding function. When not in use, the mobile terminal can be folded, making it space-saving and easy to carry. When in use, the mobile terminal can be unfolded, allowing it to have a larger screen for user convenience. This mobile terminal can be a mobile phone, tablet, etc., without specific limitations. The following explanation will focus on a foldable mobile phone.

[0042] Optionally, for the mobile terminal being configured, it can be as follows: Figure 1 and Figure 2 The structure shown, which has a first housing 1 and a second housing 4 mating together, can also be configured as a structure having a first housing 1 and at least two second housings 4 mating together, such as... Figure 4 and Figure 5 As shown, a mobile terminal is composed of a first housing 1 and two second housings 4. In this structure, the two second housings 4 are symmetrically arranged on both sides of the first housing 1, and a flexible screen 2 covers the three. In the unfolded state, the first housing 1 and the second housing 4 support the flexible screen 2, so that it is in the unfolded large screen state. When it is folded to the folded state, the second housings 4 on both sides can drive the flexible screen 2 of the connecting part to fit against the outer surface of the first housing 1, so that it can be easily carried by folding.

[0043] In existing technologies, mobile terminals include a first housing and a second housing connected by a hinge structure. The hinge structure allows the first and second housings to rotate relative to each other, causing a flexible screen covering both housings to move, thus achieving folding or flattening. However, in this hinge-connected design, the internal components are complex to fit together, and the deformation during folding and flattening occupies significant space. Furthermore, some connecting parts of the hinge structure extend at least partially into the first and / or second housings, resulting in a compact internal space. Electronic components are then tightly packed within the first and second housings, requiring additional flexible circuit boards or cables for electrical connection. Repeated folding and flattening can easily damage the flexible circuit boards and cables, reducing product reliability. Moreover, the overall thickness of the first and second housings is substantial, and with the first housing below the second after folding, the combined thickness of both constitutes the total thickness of the folded mobile terminal, making it too thick to meet the requirements for a slim and compact foldable phone.

[0044] The mobile terminal designed in this application adopts a new structure to replace the original hinge structure, in order to meet the requirements of a foldable phone that is thin, light, and compact. Specifically, as shown in... Figure 6 The image shown is an exploded view of the mobile terminal. Figure 7 The diagram shown is a partial cross-sectional view of the mobile terminal in its flattened state. The portion exposed in the partial cross-section is the connecting component 3, which replaces the traditional hinge structure in this application. Figure 8 The image shown is the main view of the mobile terminal in its flattened state. Figure 9 The diagram shown is a partial cross-sectional view of the mobile terminal in its folded state. The exposed portion of the cross-section is the connecting component 3. Figure 7 and Figure 8 The first housing 1 and the second housing 4 are connected by a connecting component 3. The first housing 1 has an arcuate portion 12, which is located on the sidewall of the first housing 1 near the second housing 4. Optionally, the arcuate portion 12 is an arcuate surface covering the sidewall. The connecting component 3 includes two or more connecting parts 31, which are rotatably connected to each other. Multiple connecting parts 31 are arranged sequentially along a first direction H, which is the extension direction between the first housing 1 and the second housing 4. The flexible screen 2 covers the first housing 1, the connecting component 3, and the second housing 4. Optionally, the first housing 1, the connecting component 3, and the second housing 4 are fixedly connected to the contact surfaces of the flexible screen 2. When the contact points of the first housing 1, the connecting component 3, and the second housing 4 with the flexible screen 2 deform, the flexible screen 2 can deform accordingly without compromising its integrity or performance. Continuing... Figure 8 and Figure 9 As shown, in the flattened state, at least one end of the first housing 1 and the end of the second housing 4, which are located on the side with the flexible screen 2, are on the same horizontal plane. When converting it from the flattened state to the folded state, the relative rotation between any one or more adjacent connecting parts 31 causes the connected second housing 4 to rotate around the first housing 1. This allows the second housing 4 to rotate the multiple connecting parts 31 of the connecting component 3 to cover at least part of the arc portion 12. The folding design is achieved by using rotating connecting parts 31 to cover the arc portion 12 instead of the traditional pivot structure. Furthermore, since the rotating connection structure between the connecting parts 31 is relatively simple, it satisfies the requirements of easy portability in the folded state and a large screen in the flattened state, while avoiding the connecting parts 31 occupying the internal space of the first housing 1 and the second housing 4. In addition, the space used to house electronic components is not occupied by the folded components, so all electronic components can be housed within the first housing 1 without the need for additional cables or flexible circuit boards to electrically connect the electronic components in the two housings. The second shell 4 is used to support the flexible screen 2 to unfold and obtain a large screen when it is flat. The way it is set up without electronic components inside allows the thickness of the second shell 4 to be less than the thickness of the first shell 1. Thus, when it is folded, the combined thickness of the first shell 1 and the second shell 4 is reduced, which reduces the weight of the product and can meet the requirements of foldable phones to be thin, light and compact.

[0045] Specifically, in order to ensure the stability of the relative positions of the first shell 1 and the second shell 4 in the folded state and to ensure that the connecting component 3 can maintain a good bending state and adhere to the arc portion 12 in the folded state, the mobile terminal also includes a magnetic part. The magnetic part is respectively disposed on the first shell 1 and the second shell 4 so that after changing from the flattened state to the folded state, the first shell 1 and the second shell 4, which are arranged along the thickness direction (the direction perpendicular to the first direction H, along which the first shell 1 in the flattened state is located below the flexible screen 2), can maintain the folded state. In this state, the first shell 1 and the second shell 4 are arranged up and down along the thickness direction, and the connecting component 3 is attached to the arc portion 12. The magnetic part can at least partially abut the first shell 1 and the second shell 4 under the action of magnetic force, so as to ensure a good folding effect and reduce the fit gap in the thickness direction between the first shell 1 and the second shell 4 through magnetic attraction, thereby reducing the total thickness of the folded product.

[0046] More specifically, to further reduce the overall thickness of the product in the folded state, the first housing 1 is provided with a groove 11, and the second housing 4 is housed within the groove 11 in the folded state. Through the design of the groove 11, the second housing 4 can at least partially extend into the groove 11 when folded, and along the thickness direction, the second housing 4 will not protrude relative to the lower surface of the first housing 1. This ensures that the maximum thickness of the product remains unchanged before and after folding, and the thickness of the first housing 1 becomes the thickness of the product, meeting the requirements for a thin and compact foldable phone.

[0047] As one specific implementation of this application, such as Figure 6 , Figure 8 and Figure 10 As shown, Figure 10 for Figure 8 The mobile terminal shown in the front view of its folded state includes a locking component 32 to maintain it in either a flat or folded state. The locking component 32 connects multiple connecting parts 31. When locked, the locking component 32 restricts rotation between the connecting parts 31, maintaining the flat or folded state. When unlocked, adjacent connecting parts 31 can rotate. The locking component 32 connects multiple connecting parts 31, and in either the flat or folded state, it locks, thus restricting relative rotation between the connected parts 31 and maintaining them in a relatively fixed state. This locking component allows the mobile terminal to maintain either a flat or folded state. When it is necessary to change the usage state of the mobile terminal, i.e., to switch between the flat and folded states, the locking component 32 is unlocked, allowing relative rotation between the connecting parts 31, thus enabling the switching between the flat and folded states.

[0048] Specifically, the locking component 32 has at least a first stable state and a second stable state, and the locking component 32 can switch between the first stable state and the second stable state. It should be emphasized here that the first stable state of the locking component 32 is that it can overcome its own weight and the weight or other forces of the connecting part 31, and when the force it can withstand is within a first preset range, it can maintain the locking component 32 in a straight fixed form, thereby supporting the connecting part 31 to make the flexible screen 2 flat and the mobile terminal maintain a flat state; the second stable state is that it can overcome its own weight and the weight or other forces of the connecting part 31, and when the force it can withstand is within a second preset range, it can maintain the locking component 32 in a bent fixed form, thereby supporting the connecting part 31 to make the flexible screen 2 bend and the mobile terminal maintain a folded state. The forces within the first and second preset ranges are the forces that can be sustained while maintaining the first and second stable states, respectively. Within these ranges, the locking component 32 can maintain the first and second stable states. When the applied force exceeds the forces within the preset range, the corresponding stable state is disrupted, causing the mobile terminal to switch between a flattened state and a folded state. When the mobile terminal is finally switched to a flattened or folded state, the locking component 32 can return to the first or second stable state after the applied force is removed. For example, when the mobile terminal is in a flattened state, the corresponding locking component 32 has a first stable state, which can support the connecting part 31 and the flexible screen 2 to maintain the mobile terminal in a flattened state. When an external force is applied to the second housing 4, causing the second housing 4 to rotate relative to the first housing 1, the external force is greater than the force within the first preset range under the first stable state, disrupting the fixed shape of the locking component 32 under the first stable state. The locking component 32 releases the restriction on the connecting part 31, thereby enabling the mobile terminal to switch from a flattened state to a folded state. When transitioning to the folded state, the locking component 32 is in a fixed state under the second stable condition. Upon removal of the external force, the force of the locking component 32 returns to the second preset range, thus maintaining the locking component 32 in the fixed state under the second stable condition. This supports the connecting part 31, the flexible screen 2 in the bent state, and the mobile terminal in the folded state. Furthermore, after the locking component 32 connects multiple connecting parts 31, in order to control the mobile terminal to remain in the flat or folded state, adjusting the locking component 32 to the first or second stable state restricts the movement between the connecting parts 31. When the locking component 32 is adjusted to the first stable state, it restricts the rotation between the connecting parts 31, keeping the mobile terminal in the flat state. During folding, the first stable state of the locking component 32 is disrupted, allowing relative rotation between the connecting parts 31. When the locking component 32 is adjusted to the second stable state, it maintains and restricts the rotation between the connecting parts 31, keeping the mobile terminal in the folded state.

[0049] More specifically, for the locking component 32 that connects multiple connecting parts 31, in order to facilitate the installation and removal of the locking component 32 and avoid interference between the locking component 32 and the flexible screen 2, each of the multiple connecting parts 31 has a first slot 313 on the side facing away from the flexible screen 2, and the first slots 313 of the multiple connecting parts 31 are connected along the first direction H. The locking component 32 passes through the multiple first slots 313. Through the setting of the first slots 313, the locking component 32 connects the multiple connecting parts 31, and the first slots 313 can restrict the locking component 32, improve the structural stability of the locking component 32, and enable it to better restrict the connecting parts 31 under different steady states, so as to more stably maintain the flat and folded states of the mobile terminal.

[0050] In addition, such as Figure 6 As shown, the locking component 32, after being installed on the mobile terminal, is arranged along the first direction H in its length direction. The two ends of the locking component 32 along its length direction can be respectively set in the first slots 313 in the outermost end connecting parts 31. Whether in the folded or flattened state, the two ends of the locking component 32 will not come out of the mating first slots 313. Alternatively, the two ends of the locking component 32 can also extend to the first housing 1 and the second housing 4 respectively. The first housing 1 and the second housing 4 are respectively provided with second slots for accommodating the ends of the locking component 32. The two ends of the locking component 32 extend into the second slots on different housings respectively. When the mobile terminal is flattened and folded, the ends of the locking component 32 will not come out of the second slots. This is to avoid the locking component 32 changing its relative position during the repeated flattening and folding of the mobile terminal, or even causing the locking component 32 to fall off from a certain connecting part 31, so that the locking component 32 cannot achieve the purpose of restricting the rotation between the connecting parts 31.

[0051] The connecting component 3 and the locking component 32 described above will be further explained in detail below.

[0052] like Figure 11 The diagram shown is a schematic of a single connecting part. Figure 12 As shown, Figure 11 A magnified view of part A in the connecting section, as shown below. Figure 16 The image shown is a partially enlarged view of the connection parts when they are in contact. Each connection part 31 includes a rotating pin 311 and a connecting hole 312. In two adjacent connection parts 31, the rotating pin 311 of one is rotatably connected to the connecting hole 312 of the other. The rotating pin 311 is configured to ensure that when the mobile terminal is folded, adjacent connection parts 31 are aligned with the rotating pin 311 as an axis (this axis direction is...). Figure 12The connecting parts 31 rotate relative to each other (parallel to the direction of the second direction M), and the rotating pin 311 can move under the bending force (external force) of the folding, thereby realizing the folding state required by the connecting parts 3 to the mobile terminal. At the same time, the locking part 32 connected to the connecting part 31 will also move to switch to the second stable state. The locking part 32 restricts the rotation between the connecting parts 31, thereby maintaining the folded state. When it is necessary to switch the mobile terminal from the folded state to the flattened state, simply unlock the locking part 32. The second stable state of the locking part 32 is broken by the external force overcoming the force within the second preset range. The locking part 32 can move with the rotation between the connecting parts 31. When the locking part 32 moves to the first stable state, the locking part 32 locks, thus restricting the rotation between the connecting parts 31. The mobile terminal is then maintained in the flattened state. Through the arrangement of multiple cooperating connecting parts 31 and the rotating pin 311 that rotatably connects adjacent connecting parts 31, the connecting parts 31 can rotate relative to each other under the action of external force to achieve bending and flattening.

[0053] During the relative rotation between the connecting parts 31, in order to adapt their rotation to the folding of the corresponding mobile terminal, so that the folded second housing 4 can be bent along the bending direction and placed below the first housing 1, multiple connecting parts 31 are arranged along the first direction H in the flattened state. The two outermost connecting parts 31 are respectively connected to the first housing 1 and the second housing 4. Furthermore, rotating pins 311 and connecting holes 312 are respectively arranged on both sides of the connecting parts 31 symmetrically along their length direction. Figure 12 As shown), each end of the same connecting part 31 is provided with a rotating pin 311 and a connecting hole 312. When two adjacent connecting parts 31 are connected, the rotating pin 311 of the previous one is connected to the connecting hole 312 of the next one, so that the connected part 31 can rotate in the second direction relative to the axis of the rotating pin 311. Thus, when an external force acts on the first housing 1 or the second housing 4 along the thickness direction of the mobile terminal, under its pressure, it can drive any adjacent connecting part 311 to rotate in the second direction relative to the axis of the rotating pin 311. At the same time, the rotating pin 311 generates vertical movement (thickness direction of the mobile terminal) under the drive of the external force, so as to realize the bending of the connecting part 3, thereby realizing the folding of the second housing 4 relative to the first housing 1. By adopting this kind of connection part 31 and rotating pin 311, the second housing 4 can rotate relative to the first housing 1 to achieve the purpose of product folding or flattening. At the same time, this kind of connection structure is simple and easy to operate. The folded or flattened state can be maintained by locking or unlocking the locking part 32. It will not occupy too much internal space of the product, thereby reducing the thickness of the product and achieving the requirement of lightness and thinness.

[0054] In order to achieve better structural stability and facilitate folding and flattening, the connecting part 31 can be set as a strip-shaped plate structure. Each plate structure is a single unit, and its length depends on the size of the first shell 1 and the second shell 4 to be connected. Multiple units are connected by rotating pins 311 to form a chain-like structure.

[0055] Optionally, for the individual units, high-strength and rigid metal components should be selected to ensure the structural stability of the product under repeated folding and prevent damage. Furthermore, the number of connecting components 3 formed by the individual units can be increased or decreased according to the overall size of the mobile terminal, and no specific limit is imposed here.

[0056] When the mobile terminal is in both flattened and folded states, the length formed on the surface of the flexible screen 2 between the two outermost connecting parts 31 after folding will inevitably be greater than the length when flattened. In order to compensate for the length difference between the two states and to ensure that the flexible screen 2 is not squeezed or stretched during movement, there is a fitting gap between the rotating pin 311 and the connecting hole 312. The fitting gap is used to compensate for the length difference and ensure the stability of repeated folding.

[0057] Specifically, such as Figure 13 , Figure 14 , Figure 15 and Figure 16 As shown, Figure 13 A schematic diagram of the structure of a mobile terminal in its flattened state after the flexible screen is removed. Figure 14 for Figure 13 Enlarged view of part B in the middle section. Figure 15 A schematic diagram of the folded state of a mobile terminal without the flexible screen. Figure 16 for Figure 15 Enlarged view of part C. The desired folding or unfolding is achieved through the cooperation of the rotating pin 311 and the connecting hole 312 in the connecting part 31. This requires only rotating the second housing 4 relative to the first housing 1 in the same direction until folding (e.g.,...). Figure 13As shown, the second housing 4 can rotate in the direction indicated by arrow L (i.e., forward rotation) and then in the reverse direction (i.e., reverse rotation) from the folded position to its original position to reach the flattened state. This allows the second housing 4 to rotate relative to the first housing 1 in two opposite directions without needing to be in the flattened state. Along the first direction H, the connecting portion 31 includes a first part 314 and a second part 315; the second part 315 is located above the first part 314, forming a stepped structure; the first part 314 has a first abutting surface 310, and the second part 315 has a second abutting surface 319; in the flattened state, in two adjacent connecting portions 31, the first abutting surface 310 of one abuts against the second abutting surface 319 of the other. The abutting surfaces 310 and 319 in the flattened state restrict rotation between the connecting portions 31 in the opposite direction to the forward rotation. By setting the first abutment surface 310 and the second abutment surface 319, at least two adjacent connecting parts 31 can overlap in the flattened state. The rotation direction between the connecting parts 31 can be restricted by the cooperation of the first abutment surface 310 and the second abutment surface 319. Thus, in the flattened state, the folding direction is restricted to one direction. When the folded mobile terminal is flattened, it can be reset to the original path to achieve the flattened state. This improves the structural stability of the connecting parts 3, avoids damage to the mating parts caused by multi-directional folding, and improves the service life.

[0058] Furthermore, when the first contact surface 310 and the second contact surface 319 contact, the mobile terminal can be kept in a flattened state, and the rotation direction between the connecting parts 31 of the connecting component 3 is limited to one direction when folded, and can be reset along the original path when unfolded. The unidirectional rotation direction of the connecting component 3 when folded is positive (direction indicated by L), while the rotation direction for resetting along the original path when unfolded is negative (direction indicated by F). In order to facilitate the transition of the mobile terminal between the flattened and folded states and save effort, the second part 315 is provided with an arc-shaped guide surface; when transitioning from the flattened state to the folded state, the positive rotation between the connecting parts 31 allows the guide surface 316 to rotate relative to the first contact surface 310. The arc-shaped guide surface 316 facilitates the relative rotation between two adjacent connecting parts 31, thereby ensuring the structural stability and convenience of the connecting component 3 when transitioning between different states.

[0059] Optional, such as Figure 14 and Figure 16As shown, regarding the cooperation between the connecting parts 31 provided above, during the folding process, the relative rotation between the connecting parts 31 is used to ultimately stack the first component 33 and the second component 34 together along the thickness direction, that is, it can rotate 180 degrees. In this rotation, the 180-degree rotation angle is distributed to the rotation angle between each adjacent connecting part 31 and stacked. In order to ensure that the connecting part 3 can support the bent part of the flexible screen 2 after folding and avoid wrinkles in the flexible screen 2, the connecting parts 31 need to be kept taut after folding. Therefore, in order to achieve this purpose, the required rotation angle between adjacent connecting parts 31 is determined according to the number and layout of the connecting parts 31. In two adjacent connecting parts 31, the first part 314 of one is provided with a limiting protrusion 317, and the second part 315 of the other is provided with a limiting groove 318. When the first housing 1 and the second housing 4 rotate to the folded state, the limiting protrusion 317 and the limiting groove 318 can cooperate to restrict the rotation between adjacent connecting parts 31, and the connecting part 3 moves to the folded state. Thus, the cooperation of the limiting protrusion 317 and the limiting groove 318 can restrict the rotation between the connecting parts 31 after reaching the folded position, and the cooperation of the two provides support for the connecting parts 3, so that the flexible screen 2 of this part is taut and wrinkles are avoided.

[0060] The locking component 32 can be used to maintain the mobile terminal in a flat or folded state, or to switch between the two states, by locking and unlocking it. To achieve this, the locking component 32 can include various implementations; the structures of several locking components 32 are described in detail below.

[0061] In one embodiment, the locking component 32 is a spring structure, such as... Figure 17 and Figure 18 The figures shown are schematic diagrams of the reed structure in the flattened and folded states of the mobile terminal, respectively. Figure 6The diagram shows an exploded view of the locking component 32 in the mobile terminal, which is configured as a spring structure. Along the first direction H, the locking component 32 connects multiple connecting parts 31. The locking component 32 is elastically deformable, and the elastic force of the locking component 32 can maintain it in a first stable state or a second stable state. The locking component 32 connects multiple connecting parts 31. Under the elastic force of the locking component 32, it can simultaneously act on multiple connecting parts 31 in both the flattened and folded states. In the flattened state, the locking component 32 can elastically deform to a first stable state to provide support for the connecting parts 31 and restrict rotation between them, thus maintaining the flattened state. In the folded state, the locking component 32 can elastically deform to a second stable state to provide support for the bent connecting parts 31, preventing relative rotation between them. When switching between the flattened and folded states, the locking component 32 can be deformed to another stable state by external force. The flattening or folding can be controlled by changing the stable state of the locking component 32 under the action of external force. The structure is simple and easy to operate.

[0062] For details, please refer to [link / reference]. Figure 17 and Figure 18To enable the locking component 32 to support and restrict the connecting parts 31 through its own elasticity in both the first and second stable states, and to allow the connecting parts 31 to rotate relative to each other by external force for folding or flattening, the following measures are implemented: In the first stable state, the locking component 32 has an arc-shaped structure, with its two ends extending towards the flexible screen 2 along a second direction M perpendicular to the first direction H, and providing resistance to the transition from the first to the second stable state. In the second stable state, the locking component 32 has a U-shaped structure, with the opening of the U-shape facing the arc portion 12, and providing resistance to the transition from the second to the first stable state. In the unfolded state of the mobile terminal, the cross-section of the locking component 32 at any position along its length is U-shaped; in the folded state, the cross-section of the locking component 32 at any position along its length is straight, and the locking component 32 has a U-shaped structure that at least partially covers the arc portion 12. This arrangement, through which the locking component 32 passes through multiple connecting portions 31, ensures that in the unfolded state, the locking component 32 maintains a U-shaped arc structure at any position along its length in the first stable state. When connected to the connecting portion 31, the internal stress in the arc-shaped extension direction of the locking component 32 acts on the connecting portion 31 in this state. The arc-shaped setting direction and the connection direction between the connecting portions 31 are perpendicular to each other, allowing the arc-shaped structure to exert its internal stress on the connecting portion 31. The internal stress generated by the arc-shaped structure when connected to the connecting portion 31 prevents the locking component 32 from bending along its length, thus preventing relative rotation between the connecting portions 31 and maintaining it in the unfolded state. When the mobile terminal needs to be switched from a flattened state to a folded state, an external force is required to overcome the internal stress of the arc-shaped structure, allowing the locking component 32 to bend along the first direction H. This flattens the arc of the structure, deforming it into a straight shape, thus bending the connecting component 3. The locking component 32 then moves to form a second stable state, and the mobile terminal remains in the folded state. In this folded state, because the spring's cross-section is in a straight, straight state, it is difficult for it to return to the arc-shaped structure. At this time, corresponding internal stress is generated, acting on the bent connecting part 31, preventing relative rotation between the connecting parts 31, thereby maintaining the folded state. When switching between the flattened and folded states, it is only necessary to overcome the internal stresses that maintain the U-shaped and straight cross-sections. Through this simple structural cooperation, the locking component 32 can be switched between the first stable state, the second stable state, or both stable states, thus enabling folding or unfolding as needed. The structure has good stability, is easy to operate, and has low cost.

[0063] In another embodiment, such as Figure 19 and Figure 20The figures show the front views of the unfolded and folded states of the mobile terminal when another locking component is installed. The locking component 32 includes a first component 33 and a second component 34. The first component 33 connects multiple connecting parts 31. Along the first direction H, the first component 33 has a first end 331 and a second end 332. The first end 331 is fixedly connected to the second housing 4, and the second end 332 is movably connected to the second slot in the first housing 1. The second component 34 is fixedly connected to the second slot in the first housing 1, and the second end 332 is located on the side of the second component 34 away from the connecting parts 31. When the second component 34 and the second end 332 of the first component 33 abut, there is a binding force between the second component 34 and the second end 332 to restrict the rotation of adjacent connecting parts 31. During the transition from the flattened state to the folded state, the external force overcomes the binding force between the second component 34 and the second end 332, the second housing 4 rotates around the first housing 1, and the second end 332 moves away from the second component 34, allowing adjacent connecting parts 31 to rotate to the folded state. In the flattened state, the stretching of the first component 33 brings the connecting parts 31 closer together, restricting their rotation. The cooperation of the first component 33 and the second component 34 keeps the first component 33 in a stretched state, thus maintaining the flattened state. When folding is required, the cooperation of the first component 33 and the second component 34 is released, allowing the first component 33 to release its restriction on the connecting parts 31, thus enabling relative rotation between the connecting parts 31 and achieving folding. To keep the product in a folded state, magnetic components can be provided in the first housing 1 and the second housing 4 as described above, so that the product can be held in a folded state by the attraction between the two components.

[0064] Optionally, the first component 33 and the second component 34 that are configured to cooperate can be configured as magnetic attracting components. The first component 33 and the second component 34 abut against each other under the action of attraction to maintain a flattened state. The magnetic attraction between the two components achieves the bonding force or the release force of the first component 33 and the second component 34. The structure is simple and easy to operate. Specifically, in the flattened state, the second ends 332 of the second component 34 are magnetically engaged with each other, and the tension of the first component 33 is used to support the connecting part 31, so that all parts are kept in a flattened state. When it is necessary to change from a flattened state to a folded state, it is only necessary to push the second housing 4 towards the first housing 1 along the first direction H while providing a folding force to the second housing 4 (a force for positive rotation along the direction of arrow L). During this process, the movement of the second housing 4 relative to the first housing 1 pushes the second end 332 to move away from the second component 34, thereby releasing the binding force between the second end 332 and the second component 34. Without the restriction of the locking component 32, the connecting parts 31 can rotate relative to each other, thereby realizing folding.

[0065] In yet another embodiment, such as Figure 21 and Figure 22 The images show the front views of the flattened and folded states when a locking component is installed on the mobile terminal. The locking component 32 is made of shape memory alloy 35 and includes a temperature regulating part that can adjust the temperature of the shape memory alloy 35. The locking component 32 can switch between a first stable state and a second stable state according to temperature changes. Specifically, the shape memory alloy 35 is fixedly connected to the second slots in the first housing 1 and the second housing 4 at both ends along the first direction H. Along the first direction, the locking component 32 connects multiple connecting parts 31, pre-setting the shape memory alloy 35 to remember a flattened state and a folded state. The temperature of the locking component 32 is changed by the action of the temperature regulating part, causing the locking component 32 of the shape memory alloy 35 to switch between the two remembered states. This structure is simple; by controlling the temperature change, the locking component 32 can perform corresponding actions to maintain the flattened state, maintain the folded state, and switch between the two states. It is convenient and easy to operate, and does not occupy much internal space.

[0066] In summary, as long as the structure of the locking component 32 described above can maintain the folded state, maintain the flat state, and allow the two states to be freely switched as needed, without occupying too much external space, it can be set in the structure of the connecting component 3. This minimizes the space occupied and is beneficial to the product's need for lightness and thinness. Based on this, other structures of locking components 32 can also be used, and no specific limitations are made here.

[0067] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A mobile terminal, characterized in that, include: The first housing (1) is provided with an arc-shaped portion (12); Second shell (4); A connecting component (3) is disposed between the first housing (1) and the second housing (4); The connecting component (3) includes two or more connecting parts (31), adjacent connecting parts (31) are rotatably connected, and multiple connecting parts (31) are arranged sequentially along a first direction H, where the first direction H is the extension direction between the first housing (1) and the second housing (4); A flexible screen (2) covers the first housing (1), the connecting component (3), and the second housing (4); The mobile terminal includes at least a flattened state and a folded state. When the flattened state is converted to the folded state, the second housing (4) drives the multiple connecting parts (31) of the connecting component (3) to rotate to cover at least part of the arc portion (12). A locking component (32) connects a plurality of the connecting parts (31). When the locking component (32) is locked, it restricts the rotation between the connecting parts (31) to maintain the flattened state or the folded state. When the locking component (32) is unlocked, adjacent connecting parts (31) can rotate. Each of the multiple connecting parts (31) has a first slot (313) on the side opposite to the flexible screen (2), and the first slots (313) of the multiple connecting parts (31) are connected along the first direction H, and the locking member (32) passes through the multiple first slots (313).

2. The mobile terminal according to claim 1, characterized in that, The locking component (32) has at least a first stable state and a second stable state, and the locking component (32) can switch between the first stable state and the second stable state; When the locking component (32) is in the first stable state and the second stable state respectively, the mobile terminal can be maintained in the flattened state and the folded state respectively.

3. The mobile terminal according to any one of claims 1-2, characterized in that, The locking component (32) extends to the first housing (1) and the second housing (4) at both ends, respectively. The first housing (1) and the second housing (4) are respectively provided with a second slot for accommodating the end of the locking component (32).

4. The mobile terminal according to any one of claims 2, characterized in that, The locking component (32) is a spring structure.

5. The mobile terminal according to claim 4, characterized in that, In the first steady state, the locking component (32) has an arc-shaped structure, and the two ends of the locking component (32) extending along the second direction M perpendicular to the first direction H gradually approach the flexible screen (2), and the locking component (32) provides resistance to the transition from the first steady state to the second steady state.

6. The mobile terminal according to claim 5, characterized in that, In the second steady state, the locking member (32) has a U-shaped structure with the opening of the U-shaped structure facing the arc portion (12), and the locking member (32) provides resistance to the transition from the second steady state to the first steady state.

7. The mobile terminal according to any one of claims 2, characterized in that, The locking component (32) is made of shape memory alloy (35); The locking component (32) includes a temperature regulating section that regulates the temperature of the shape memory alloy (35), and the locking component (32) switches between a first steady state and a second steady state according to the temperature change.

8. The mobile terminal according to claim 3, characterized in that, The locking component (32) includes: A first component (33) connects the plurality of connecting portions (31); Along the first direction H, the first component (33) has a first end (331) and a second end (332), the first end (331) is fixedly connected to the second housing (4), and the second end (332) is movably connected to the second slot in the first housing (1); The second component (34) is fixedly connected to the second slot in the first housing (1), and the second end (332) is located on the side of the second component (34) away from the connecting part (31). When the second component (34) and the second end (332) of the first component (33) abut, there is a binding force between the second component (34) and the second end (332) to restrict the rotation of the adjacent connecting parts (31). During the transition from the flattened state to the folded state, the external force overcomes the binding force between the second component (34) and the second end (332), the second housing (4) rotates around the first housing (1), the second end (332) moves away from the second component (34), and the adjacent connecting parts (31) can rotate to the folded state.

9. The mobile terminal according to claim 8, characterized in that, The first component (33) is a magnetic component, and the second component (34) is a magnetic component. The first component (33) and the second component (34) abut against each other under the action of attraction to maintain the flattened state.

10. The mobile terminal according to any one of claims 4-9, characterized in that, The connecting part (31) includes a rotating pin (311) and a connecting hole (312). In two adjacent connecting parts (31), the rotating pin (311) of one is rotatably connected to the connecting hole (312) of the other, and there is a fitting clearance between the rotating pin (311) and the connecting hole (312).

11. The mobile terminal according to claim 9, characterized in that, The connecting part (31) includes a first part (314) and a second part (315), the second part (315) being located above the first part (314) to form a stepped structure; The first part (314) is provided with a first contact surface (310), and the second part (315) is provided with a second contact surface (319); In the flattened state, in two adjacent connecting parts (31), the first abutting surface (310) of one abuts against the second abutting surface (319) of the other.

12. The mobile terminal according to claim 11, characterized in that, In two adjacent connecting portions (31), the first part (314) of one of them is provided with a limiting protrusion (317), and the second part (315) of the other is provided with a limiting groove (318); When the first housing (1) and the second housing (4) are rotated to the folded state, the limiting protrusion (317) and the limiting groove (318) cooperate to restrict the rotation between adjacent connecting parts (31).

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