Patent Description:
With the advancement in science and technology, an era of a large-screen intelligent terminal is approaching. To resolve a problem that a conventional tablet computer is large in volume and inconvenient to carry, and a problem that a screen of a mobile phone is small, a foldable screen terminal emerges.

The foldable screen terminal implements large-screen display in an unfolded state. When the foldable screen is folded inward, the screen starts to be bent. When the screen is in a folded state, a folded portion of the screen has a specific amount of downward movement compared with the portion of the screen in the unfolded state. If a component in the foldable screen terminal does not avoid the screen here, the screen body will be unreliable. In the conventional technology, many components avoid a middle portion of the screen, and consequently a thickness of the foldable screen terminal is large, and it is difficult to implement lightening and thinning of the foldable screen terminal.

<CIT> Al discusses an electronic device including a hinge assembly. <CIT> discusses a folding mechanism and electronic equipment, and belongs to the field of communication equipment.

Embodiments of this application provide a rotation mechanism, a supporting apparatus, and a foldable screen terminal, so as to reduce a thickness of the foldable screen terminal and facilitate lightening and thinning of the foldable screen terminal.

To achieve the foregoing objective, the following technical solutions are used in embodiments of this application:.

According to a first aspect, and to the present invention, a rotation mechanism is provided according to appended claim <NUM>.

When the first swing arm and the second swing arm are in the unfolded position, the lifting member is supported on the first and second supporting members, and the forcing structure applies a tensile force directed to the shaft cover to the lifting member; and when the first swing arm and the second swing arm swing from the unfolded position to the folded position, the first and second supporting members move toward the shaft cover, and the lifting member descends under an action of the tension force of the forcing structure.

In the rotation mechanism provided in this embodiment of this application, the forcing structure is located between the lifting member and the shaft cover, one end of the forcing structure is connected to the lifting member, and the other end thereof is connected to the shaft cover, that is, the forcing structure is directly connected between the lifting member and the shaft cover. Therefore, a thickness of the rotation mechanism is small, thereby facilitating thinning of the foldable screen terminal.

In a possible implementation of the first aspect, when the first swing arm and the second swing arm swing from the folded position to the unfolded position, the first and second supporting member move toward the lifting member to apply a support force to the lifting member, and the support force can overcome the tensile force of the forcing structure to drive the lifting member to ascend. Therefore, the lifting member can be driven to ascend, to stably support a middle portion of the foldable screen when the first swing arm and the second swing arm are in the unfolded position.

In a possible implementation of the first aspect, the forcing structure is an elastic member, one end that is of the elastic member and that is along a telescopic direction is connected to the lifting member, and the other end thereof along a telescopic direction is connected to the shaft cover; and when the first swing arm and the second swing arm are in the unfolded position, the elastic member applies an elastic tensile force directed to the shaft cover to the lifting member, and when the first swing arm and the second swing arm swing from the unfolded position to the folded position, the lifting member descends under an action of the elastic tensile force of the forcing structure. An elastic structure has good stability, is widely used, and can be easily implemented.

In a possible implementation of the first aspect, the elastic member is a tower spring. Because the tower spring is a spiral spring whose spiral radius gradually decreases, compared with a cylindrical spiral spring, a larger quantity of spiral rings can be formed through spiraling in the tower spring on a premise that a size in the telescopic direction is fixed, so that elasticity of the tower spring is better. In addition, on a premise that the elasticity is the same, a height of the tower spring can be designed to be small, so that a distance between the lifting member and the shaft cover can be reduced, thereby facilitating thinning of the foldable screen terminal.

In a possible implementation of the first aspect, the tower spring includes two ends along the telescopic direction, a smaller-diameter end thereof is connected to the lifting member, and a larger-diameter end thereof is connected to the shaft cover. In this way, space on a peripheral side of the smaller-diameter end of the tower spring is relatively large, so that the first rotating shaft, the second rotating shaft, the first swing arm, and the second swing arm can be avoided, to reduce a width of the rotation mechanism.

In a possible implementation of the first aspect, the forcing structure may alternatively be a cylindrical spiral spring, a spring sheet, a leaf spring, a rubber band, or the like.

In a possible implementation of the first aspect, the forcing structure may alternatively be a magnetic body assembly including a magnetic body and a magnetic conductive member; the magnetic body in the magnetic body assembly includes, but is not limited to, a magnet and a magnetic steel; and one of the magnetic body and the magnetic conductive member is fastened to the lifting member and the other is fastened to the shaft cover, and the magnetic body and the magnetic conductive member are spared apart from each other. In this way, the magnetic body and the magnetic conductive member are attracted to each other to generate a magnetic attraction force, so as to drive the lifting member to descend by using the magnetic attraction force.

In a possible implementation of the first aspect, the lifting member includes a lifting member body and a buckling member; a mounting hole is disposed on the lifting member body, the mounting hole penetrates through the lifting member body along a lifting direction of the lifting member, the mounting hole allows the buckling member to be mounted into the mounting hole from one end that is of the mounting hole and that is away from the elastic member; after the buckling member is mounted into the mounting hole, the mounting hole also prevents the buckling member from being separated from the mounting hole from one end that is of the mounting hole and that is close to the elastic member; and the elastic member is detachably connected to the buckling member. In this way, the lifting member, the forcing structure, and the shaft cover may be assembled as follows: First, one end of the forcing structure is fastened to an inner surface of the shaft cover; next, the lifting member body of the lifting member is disposed on a side that is of the forcing structure and that is away from the shaft cover, and the mounting hole is opposite to the other end of the forcing structure; then, the other end of the forcing structure is pulled out from the mounting hole to a side that is of the lifting member body and that is away from the shaft cover, and is connected to the buckling member; and finally, the buckling member connected to the forcing structure is mounted into the mounting hole of the lifting member body, to complete assembly. This assembly operation is not difficult and can be easily implemented, and operation of mounting the forcing structure in a narrow gap between the lifting member and the shaft cover is avoided.

In a possible implementation of the first aspect, the mounting hole includes a first hole segment and a second hole segment, the second hole segment is located on a side that is of the first hole segment and that is close to the elastic member, and a cross section area of the second hole segment is smaller than a cross section area of the first hole segment; and the buckling member includes a supporting portion and a fastening portion, the supporting portion matches and is accommodated in the first hole segment, and the fastening portion matches and is accommodated in the second hole segment. This structure is simple and can be easily implemented.

In a possible implementation of the first aspect, the rotation mechanism further includes a guide post and a guide sleeve; and one of the guide post and the guide sleeve is disposed on the lifting member, and the other is disposed on the shaft cover, an axis direction of the guide post and an axis direction of the guide sleeve coincide with the lifting direction of the lifting member, the guide post is sleeved in the guide sleeve, and the guide post slides in the guide sleeve relative to the guide sleeve when the lifting member descends or ascends relative to the shaft cover. In this way, the guide post and the guide sleeve can guide a lifting movement of the lifting member, to prevent the lifting member from being misaligned during lifting.

In a possible implementation of the first aspect, a first stop member is fastened on the shaft cover, and the first stop member includes a first surface region; a second stop member is fastened on the lifting member, and the second stop member includes a second surface region; and when the first swing arm and the second swing arm are in the folded position, the first stop member is laminated with the second surface region of the second stop member by using the first surface region. Therefore, the first stop member and the second stop member cooperate with the forcing structure to limit the lifting member, so as to maintain a position of the lifting member when the first swing arm and the second swing arm are in the folded position, and prevent the position of the lifting member from moving due to an external force.

Based on the foregoing implementation, optionally, when the first swing arm and the second swing arm are in the folded position, the tensile force that is applied by the forcing structure to the lifting member and that is directed to the shaft cover is greater than zero. In this way, the forcing structure presses the lifting member against the first stop member, to improve stability of the position of the lifting member and prevent an external impact force from forcing the position of the lifting member to change.

In a possible implementation of the first aspect, both the first surface region and the second surface region are inclined relative to the lamination surface, and when the first swing arm and the second swing arm are in the folded position, a frictional coefficient between the first surface region and the second surface region is greater than a reciprocal of a tangent value of an inclination angle of the first surface region or the second surface region. In this way, when an outer surface of the shaft cover is impacted by an external force, the external force is transferred to an inner side of the shaft cover to the first stop member, and the first stop member cannot drive the second stop member and the lifting member to move. Therefore, the position of the lifting member is further maintained.

In a possible implementation of the first aspect, a quantity of the first surface regions is two, the two first surface regions are disposed symmetrically with respect to a plane parallel to the lifting direction of the lifting member, a quantity of the second surface regions is also two, and the two second surface regions are disposed symmetrically with respect to the plane parallel to the lifting direction of the lifting member; and when the first swing arm and the second swing arm are in the folded position, the two first surface regions of the first stop member are respectively laminated with the two second surface regions of the second stop member. In this way, forces applied when the first stop member abuts against the second stop member is balanced, to prevent the rotation mechanism from being stuck during lifting of the lifting member.

In the first aspect, the first supporting member is relatively fastened to the first swing arm and the second supporting member is relatively fastened to the second swing arm; when the first swing arm and the second swing arm are in the unfolded position, the lifting member is supported on the first supporting member and the second supporting member; and when the first swing arm and the second swing arm swing from the unfolded position to the folded position, both the first supporting member and the second supporting member move toward the shaft cover. In this way, in the unfolded state, the support force applied to the lifting member is more stable, thereby ensuring stability of the position of the lifting member.

According to a second aspect, some embodiments of this application provide a supporting apparatus, where the supporting apparatus includes a first housing, a second housing, and the rotation mechanism described in any one of the foregoing technical solutions, the rotation mechanism is located between the first housing and the second housing, a first swing arm of the rotation mechanism is connected to the first housing, and a second swing arm of the rotation mechanism is connected to the second housing.

The supporting apparatus provided in this embodiment of this application includes the rotation mechanism described in any one of the foregoing technical solutions, so that both can resolve a same technical problem and achieve a same effect.

According to a third aspect, some embodiments of this application provide a foldable screen terminal, where the foldable screen terminal includes a foldable screen and the supporting apparatus as described in the foregoing technical solution; and the foldable screen includes a first part, a second part, and a third part, the third part is located between the first part and the second part, the first part is supported and fastened on a first housing, the second part is supported and fastened on a second housing, and the third part is supported on a rotation mechanism of the supporting apparatus.

The foldable screen terminal provided in this embodiment of this application includes the supporting apparatus described in any one of the foregoing technical solutions, so that both can resolve a same technical problem and achieve a same effect.

In embodiments of this application, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of technical features indicated. Therefore, the features defined with "first", "second" and "third" may explicitly or implicitly include one or more of the features.

In the embodiments of this application, the term "including", "containing" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such a process, method, article or apparatus. Without further limitation, the element defined by the sentence "including a. " does not exclude that other identical elements are also present in the process, method, article or apparatus including the element.

This application provides a foldable screen terminal, and the foldable screen terminal is a foldable screen terminal with a foldable screen. Specifically, the foldable screen terminal includes, but is not limited to, a mobile phone, a tablet personal computer (tablet personal computer), a laptop computer (laptop computer), a personal digital assistant (personal digital assistant, PDA), and the like.

<FIG> is a perspective view of a foldable screen terminal <NUM> according to some embodiments of this application. This embodiment is described by using a mobile phone as an example of the foldable screen terminal <NUM>. The foldable screen terminal <NUM> includes a foldable screen <NUM> and a supporting apparatus <NUM>. It can be understood that <FIG> shows only some example components included in the foldable screen terminal <NUM>. Actual shapes, actual sizes, actual positions, and actual configurations of these components are not limited by <FIG>.

The foldable screen <NUM> is configured to display an image, a video, and the like. The foldable screen <NUM> may be folded into a first part <NUM> and a second part <NUM>. The foldable screen <NUM> further includes a third part <NUM> located between the first part <NUM> and the second part <NUM>. At least the third part <NUM> of the foldable screen <NUM> is made of a flexible material. The first part <NUM> and the second part <NUM> may be made of a flexible material, or may be made of a rigid material; or a part of the first part <NUM> and the second part <NUM> is made of a rigid material, and the other part thereof is made of a flexible material. This is not specifically limited herein.

Specifically, the foldable screen <NUM> may be an organic light-emitting diode (organic light-emitting diode, OLED) screen, a micro organic light-emitting diode (micro organic light-emitting diode) screen, a quantum dot light emitting diodes (quantum dot light emitting diodes, QLED) screen, a liquid crystal display (liquid crystal display, LCD), or the like.

<FIG> is a front view of the foldable screen terminal <NUM> shown in <FIG>. The foldable screen <NUM> is supported on the supporting apparatus <NUM>. In some embodiments, still referring to <FIG>, the supporting apparatus <NUM> includes a first housing <NUM>, a second housing <NUM>, and a rotation mechanism <NUM>. The first housing <NUM> is configured to fasten and support the first part <NUM> of the foldable screen <NUM>. Specifically, the first housing <NUM> includes a lamination surface M1, and the first housing <NUM> is configured to fasten and support the first part <NUM> of the foldable screen <NUM> in <FIG> by using the lamination surface M1. The second housing <NUM> is configured to fasten and support the second part <NUM> of the foldable screen <NUM> in <FIG>. Specifically, the second housing <NUM> includes a lamination surface M2, and the second housing <NUM> is configured to fasten and support the second part <NUM> of the foldable screen <NUM> in <FIG> by using the lamination surface M2. The rotation mechanism <NUM> is configured to support the third part <NUM> of the foldable screen <NUM>. Specifically, the rotation mechanism <NUM> includes a lamination surface M3, and the rotation mechanism <NUM> is configured to fasten and support the third part <NUM> of the foldable screen <NUM> by using the lamination surface M3. The rotation mechanism <NUM> is connected between the first housing <NUM> and the second housing <NUM>, and the first housing <NUM> and the second housing <NUM> are rotatably connected by using the rotation mechanism <NUM>, to enable the foldable screen terminal <NUM> to rotate between an unfolded state and a folded state.

<FIG> each are a schematic diagram of a structure of the foldable screen terminal <NUM> in the unfolded state. When the foldable screen terminal <NUM> is in the unfolded state, the lamination surface M1, the lamination surface M2, and the lamination surface M3 are coplanar, to open the foldable screen <NUM> and ensure flatness of the foldable screen <NUM>. In this state, large-screen display can be implemented, which can provide richer information to a user and improve user experience.

<FIG> is a schematic diagram of a structure of the foldable screen terminal shown <NUM> in <FIG> in a folded state; When the foldable screen terminal <NUM> is in the folded state, the first part <NUM> is opposite to the second part <NUM>, and the third part <NUM> is in the folded state. The supporting apparatus <NUM> is outside the foldable screen <NUM>, and the user cannot see the foldable screen <NUM>, to prevent the foldable screen <NUM> from being scratched by a hard object.

<FIG> is a schematic diagram showing relative positions of a foldable screen <NUM> in the foldable screen terminal <NUM> shown in <FIG> in an unfolded state and a folded state. In <FIG>, the foldable screen <NUM> is in the unfolded state as shown by a dotted line, and the foldable screen <NUM> is in the folded state as shown by a solid line. A middle portion (that is, the third part <NUM>) of the foldable screen <NUM> in the folded state has a specific amount of downward movement compared with the middle portion of the foldable screen <NUM> in the unfolded state. If the rotation mechanism <NUM> in the supporting apparatus <NUM> does not avoid the portion of the foldable screen <NUM>, the foldable screen <NUM> will be unreliable.

To avoid the middle portion of the foldable screen <NUM>, referring to <FIG> is a schematic diagram of a structure of a rotation mechanism <NUM> according to this application. The rotation mechanism <NUM> includes a lifting member <NUM>, a fastening base <NUM>, a screw <NUM>, a forcing structure <NUM>, a first swing arm <NUM>, a second swing arm <NUM>, a first supporting member <NUM>, and a second supporting member <NUM>.

The first swing arm <NUM> and the second swing arm <NUM> are respectively located on two opposite sides of the lifting member <NUM>. The first swing arm <NUM> is connected to the first housing <NUM> in <FIG> and <FIG>, the second swing arm <NUM> is connected to the second housing <NUM> in <FIG> and <FIG>, and both the first swing arm <NUM> and the second swing arm <NUM> are rotatable relative to the fastening base <NUM>. Relative positions of the fastening base <NUM> and each of a rotation axis of the first swing arm <NUM> and a rotation axis of the second swing arm <NUM> are fixed. In this way, the first housing <NUM> is rotatably connected to the second housing <NUM>, so that the foldable screen terminal can rotate between the unfolded state and the folded state.

Based on this, a lamination surface M3 is formed on the lifting member <NUM>. The fastening base <NUM> and the screw <NUM> are located on a side that is of the lifting member <NUM> and that is away from a lamination surface M3. The screw <NUM> is fastened to the lifting member <NUM>, and the screw <NUM> and a part of the lifting member <NUM> slidably penetrate into the fastening base <NUM> along a lifting direction of the lifting member <NUM>. The forcing structure <NUM> is connected between the fastening base <NUM> and the screw <NUM>, and the forcing structure <NUM> is a compression spring. The first supporting member <NUM> is fastened on the first swing arm <NUM>, and optionally, the first supporting member <NUM> and the first swing arm <NUM> are an integral structural member. The second supporting member <NUM> is fastened on the second swing arm <NUM>, and optionally, the second supporting member <NUM> and the second swing arm <NUM> are an integral structural member.

When the foldable screen terminal is in the unfolded state, referring to <FIG>, the lifting member <NUM> is supported on the first supporting member <NUM> and the second supporting member <NUM>, and the forcing structure <NUM> is in a compressed state, to apply an elastic tensile force F away from the lifting member <NUM> to the screw <NUM>. When the foldable screen terminal is rotated from the unfolded state to the folded state, the first swing arm <NUM> and the second swing arm <NUM> swing upward along a direction a1 and a direction a2 respectively, the first supporting member <NUM> and the second supporting member <NUM> swing downward along a direction b1 and a direction b2 respectively, and the screw <NUM> and the lifting member <NUM> descend under an action of the elastic tensile force of the forcing structure <NUM>. When the foldable screen terminal is in the folded state, the forcing structure <NUM> is in a free state. Then, when the foldable screen terminal is rotated from the folded state to the unfolded state, the first supporting member <NUM> and the second supporting member <NUM> swing upward along an opposite direction of the direction b1 and an opposite direction of the direction b2 respectively, to drive the lifting member <NUM> to ascend. In addition, the forcing structure <NUM> compresses, to accumulate an elastic tensile force, thereby facilitating a next descending operation of the lifting member <NUM>.

The rotation mechanism <NUM> includes many components, and a thickness of the rotation mechanism <NUM> (that is, a size along a direction of Z axis in <FIG>) is a superposition of a partial lifting member <NUM>, a partial screw <NUM>, a partial fastening base <NUM>, the forcing structure <NUM>, and a lifting stroke of the lifting member <NUM>. Consequently, a thickness of the rotation mechanism <NUM> is large, which does not facilitate lightening and thinning of the foldable screen terminal.

To resolve the foregoing problem, referring to <FIG>, <FIG> is a perspective view of a rotation mechanism <NUM> according to some embodiments of this application; <FIG> is an exploded view of the rotation mechanism <NUM> shown in <FIG>; <FIG> is a top view of the rotation mechanism <NUM> shown in <FIG>; and <FIG> is a schematic diagram of a structure of a cross section of the rotation mechanism <NUM> shown in <FIG> at line A-A. The rotation mechanism <NUM> described in this embodiment includes a lifting member <NUM>, a shaft cover <NUM>, a first swing arm <NUM>, a second swing arm <NUM>, a forcing structure <NUM>, a first supporting member <NUM>, and a second supporting member <NUM>.

To facilitate description of the following embodiments, an XYZ coordinate system is established, and a length direction of the rotation mechanism <NUM> is defined as the X axis direction, a width direction of the rotation mechanism <NUM> is defined as the Y axis direction, and the thickness direction of the rotation mechanism <NUM> is defined as the Z axis direction. It may be understood that a coordinate system of the rotation mechanism <NUM> may be flexibly set according to an actual need, and this application only shows an example, which cannot be considered as a special limitation to this application.

The first swing arm <NUM> and the second swing arm <NUM> are respectively located on two opposite sides of the lifting member <NUM>. The first swing arm <NUM> is connected to the first housing <NUM> in <FIG> and <FIG>, and the second swing arm <NUM> is connected to the second housing <NUM> in <FIG> and <FIG>. Specifically, the first swing arm <NUM> and the first housing <NUM>, and the second swing arm <NUM> and the second housing <NUM> may be fixedly connected, may be slidably connected, or is rotatably connected. This is not limited in this embodiment of this application. In addition, the first swing arm <NUM> and the first housing <NUM>, and the second swing arm <NUM> and the second housing <NUM> may be directly connected, or may be indirectly connected by using another middle structure. This is not specifically limited herein, provided that, when the foldable screen terminal rotates between an unfolded state and a folded state, a swing direction of the first swing arm <NUM> coincides with a rotation direction of the first housing <NUM> and a swing direction of the second swing arm <NUM> coincides with a rotation direction of the second housing <NUM>.

The first swing arm <NUM> and the second swing arm <NUM> can swing between an unfolded position and a folded position relative to the shaft cover (<NUM>). When the first swing arm <NUM> and the second swing arm <NUM> are in the unfolded position, the foldable screen terminal is in the unfolded state; or when the first swing arm <NUM> and the second swing arm <NUM> are in the folded position, the foldable screen terminal is in the folded state.

In some embodiments, relative positions of the shaft cover <NUM> and each of a rotation axis of the first swing arm <NUM> and a rotation axis of the second swing arm <NUM> are fixed. To meet this condition, referring to <FIG> is an assembly diagram of a first swing arm <NUM>, a second swing arm <NUM>, a shaft cover <NUM> and a base <NUM> in <FIG>. The rotation mechanism <NUM> further includes the base <NUM>, and the base <NUM> is fastened to the shaft cover <NUM>. The first swing arm <NUM> is rotatably connected to the base <NUM> by using a first rotating shaft 23a, and the second swing arm <NUM> is rotatably connected to the base <NUM> by using a second rotating shaft 23b. In this way, the relative positions of the shaft cover <NUM> and each of the rotation axis of the first swing arm <NUM> and the rotation axis of the second swing arm <NUM> are fixed by using the base <NUM>, the first rotating shaft 23a, and the second rotating shaft 23b.

Specifically, a rotatable connection manner of the first swing arm <NUM> is the same as a rotatable connection manner of the second swing arm <NUM>, and the following only uses the rotatable connection manner of the first swing arm <NUM> as an example for description. Specifically, the rotatable connection manner of the first swing arm <NUM> may include the following Example <NUM> and Example <NUM>.

Referring to <FIG>, the first swing arm <NUM> is fixedly connected to the first rotating shaft 23a. Optionally, the first swing arm <NUM> is provided with a flat hole a, and the first rotating shaft 23a includes a flat shaft section b. The first swing arm <NUM> is sleeved onto the flat shaft section b of the first rotating shaft 23a by using the flat hole a, to prevent the first swing arm <NUM> from rotating around the first rotating shaft 23a, so that the first swing arm <NUM> is fixedly connected to the first rotating shaft 23a. The "flat hole" described in this embodiment and the following embodiments refers to a hole whose inner wall includes a plane portion. Correspondingly, the flat shaft is a shaft on which a plane portion is formed through milling or the like on a side surface. The flat hole cooperates with the flat shaft, to prevent the hole and the shaft from relatively rotating. In some other embodiments, the first swing arm <NUM> and the first rotating shaft 23a may alternatively be fastened together through interference fitting between a rotating shaft and a hole, welding, or the like. Based on this, the first rotating shaft 23a is rotatably connected to the base <NUM> by using the first rotating shaft 23a as an axis. Specifically, in some embodiments, still referring to <FIG>, a first rotation hole <NUM> is disposed on the base <NUM>, and the first rotating shaft 23a penetrates into the first rotation hole <NUM> and can rotate in the first rotation hole <NUM>.

In the foregoing example, when the first swing arm <NUM> rotates relative to the base <NUM>, the first rotating shaft 23a rotates accordingly. Because the rotatable connection manner of the second swing arm <NUM> is the same as the rotatable connection manner of the first swing arm <NUM>, when the second swing arm <NUM> rotates relative to the base <NUM>, the second rotating shaft 23b rotates accordingly. Based on this, a transmission gear may be disposed on each of the first rotating shaft 23a and the second rotating shaft and 23b. For example, referring to <FIG> is a schematic diagram of a structure of each of a first rotating shaft 23a and a second rotating shaft 23b in a rotation mechanism <NUM> according to some embodiments of this application. A first gear 23c is fastened on the first rotating shaft 23a. A center axis of the first gear 23c is collinear with a center axis of the first rotating shaft 23a. A second gear 23d is fastened on the second rotating shaft 23b. A center axis of the second gear 23d is collinear with a center axis of the second rotating shaft 23b. A diameter of the first gear 23c is equal to that of the second gear 23d. The first gear 23c is engaged with the second gear 23d for transmission. Alternatively, an even quantity of middle gears are disposed between the first gear 23c and the second gear 23d, and the first gear 23c, the even quantity of middle gears, and the second gear 23d are sequentially engaged for transmission. In this way, the first swing arm <NUM> and the second swing arm <NUM> can be driven to swing synchronously along opposite directions by using the first gear 23c and the second gear 23d, or by using the first gear 23c, the even quantity of middle gears, and the second gear 23d.

In the foregoing embodiment, a quantity of the middle gears may be two, four, six, or the like, and as the quantity of the middle gears increases, a diameter of the middle gear, a diameter of the first gear 23c, and a diameter of the second gear 23d may be designed small, to reduce a height of the rotation mechanism <NUM> in the Z axis direction. However, as the quantity of middle gears increases, structural complexity of the rotation mechanism <NUM> increases. Therefore, to balance the height and the structural complexity of the rotation mechanism <NUM>, in some embodiments, referring to <FIG> is an assembly diagram of a first gear 23c, a middle gear 23e, and a second gear 23d in a rotation mechanism <NUM> according to some embodiments of this application. In this embodiment, the quantity of the middle gears 23e is two. In this way, the quantity of middle gears 23e is moderate, to balance the height and the structural complexity of the rotation mechanism <NUM>.

A rotation hole (not shown in the figure) is disposed on the first swing arm <NUM>, the first swing arm <NUM> is sleeved onto the first rotating shaft 23a by using the rotation hole and can rotate around the first rotating shaft 23a, and the first rotating shaft 23a is fastened to the base <NUM>. In this way, when the first swing arm <NUM> rotates relative to the base <NUM>, the first rotating shaft 23a is fixed relative to the base <NUM>. This structure is simple and can be easily implemented.

Based on the foregoing descriptions, the first housing <NUM> is rotatably connected to the second housing <NUM> by using the rotation mechanism <NUM>, so that the foldable screen terminal can rotate between the unfolded state and the folded state.

Based on the foregoing, referring back to <FIG>, the lifting member <NUM> includes the lamination surface M3, the lamination surface M3 is the lamination surface M3 in the foldable screen terminal shown in <FIG> and <FIG>, and the lamination surface M3 is used for lamination with the third part <NUM> of the foldable screen <NUM>. The shaft cover <NUM> is located on the side that is of the lifting member <NUM> and that is away from the lamination surface M3. The shaft cover <NUM> is configured to prevent moving parts (such as the first rotating shaft 23a, the second rotating shaft 23b, the first swing arm <NUM>, and the second swing arm <NUM>) in the rotation mechanism <NUM> from being disturbed by the outside. A surface that is of the shaft cover <NUM> and that is away from the lifting member <NUM> forms an outer surface of the rotation mechanism <NUM>.

The forcing structure <NUM> is located between the lifting member <NUM> and the shaft cover <NUM>, one end of the forcing structure <NUM> is connected to the lifting member <NUM>, and the other end thereof is connected to the shaft cover <NUM>. The forcing structure <NUM> is configured to apply a tensile force directed to the shaft cover <NUM> to the lifting member <NUM>, to drive the lifting member <NUM> to descend. In some embodiments, still referring to <FIG>, the forcing structure <NUM> is an elastic member. Optionally, the elastic member is a tower spring. The tower spring is a spiral spring whose spiral radius gradually decreases. One end that is of the tower spring and that is along a telescopic direction is connected to the lifting member <NUM>, and the other end that is of the tower spring and that is along the telescopic direction is connected to the shaft cover <NUM>. When the tower spring is stretched and deformed, an elastic tension force directed to the shaft cover <NUM> may be applied to the lifting member <NUM>. The lifting member <NUM> can be driven to descend by using the elastic tension force of the tower spring. Because the tower spring is a spiral spring whose spiral radius gradually decreases, compared with a cylindrical spiral spring, a larger quantity of spiral rings can be formed through spiraling in the tower spring on a premise that a size in the telescopic direction (that is, the height H in <FIG>) is fixed, so that elasticity of the tower spring is better. In addition, on a premise that the elasticity is the same, the height H of the tower spring can be designed to be small, so that a distance between the lifting member <NUM> and the shaft cover <NUM> can be reduced, thereby facilitating thinning of the foldable screen terminal.

Because the tower spring is a spiral spring whose spiral radius gradually decreases, the tower spring includes a smaller-diameter end and a larger-diameter end along the telescopic direction of the tower spring, and a diameter of the larger-diameter end is greater than a diameter of the smaller-diameter end. Optionally, still referring to <FIG>, the smaller-diameter end of the tower spring is connected to the lifting member <NUM>, and the larger-diameter end of the tower spring is connected to the shaft cover <NUM>. In this way, space on a peripheral side of the smaller-diameter end of the tower spring is relatively large, and the first rotating shaft 23a, the second rotating shaft 23b, the first swing arm <NUM>, and the second swing arm <NUM> can be avoided, to reduce a width of the rotation mechanism <NUM> in the Y axis direction. In some other embodiments, the smaller-diameter end of the tower spring may alternatively be connected to the lifting member <NUM>, and in this case, the larger-diameter end of the tower spring is connected to the shaft cover <NUM>.

The tower spring and the shaft cover <NUM>, and the tower spring and the lifting member <NUM> may be detachably connected, or may be non-detachably connected. This is not specifically limited herein.

In some embodiments, <FIG> is a perspective view of a shaft cover <NUM> in the rotation mechanism <NUM> shown in <FIG>. An inner surface of the shaft cover <NUM> is provided with a fastening block <NUM>, and the fastening block <NUM> is a rectangular parallelepiped structure. In some other embodiments, the fastening block <NUM> may alternatively be a cylindrical structure. A fastening hole <NUM> is disposed on the fastening block <NUM>. An axis direction of the fastening hole <NUM> extends along the Y axis direction. <FIG> is a schematic diagram of an assembly structure of a shaft cover <NUM> and a tower spring in the rotation mechanism <NUM> shown in <FIG>. A part of the larger-diameter end of the tower spring penetrates into the fastening hole <NUM>, and a remaining part is fastened to the inner surface of the shaft cover <NUM> by using an adhesive. In this way, the fastening block <NUM> with high stability fastens and holds the part of the larger-diameter end of the tower spring, and the remaining part of the larger-diameter end is fastened to the shaft cover <NUM> by using an adhesive or the like, so that both the fastening stability and operation convenience can be achieved. Certainly, the larger-diameter end of the tower spring may be fastened to the inner surface of the shaft cover <NUM> as a whole by using an adhesive. This is not specifically limited herein. In this embodiment, the fastening manner of the tower spring and the shaft cover <NUM> is a non-detachable connection manner, to facilitate connection stability.

<FIG> is a perspective view of a lifting member <NUM> in the rotation mechanism <NUM> shown in <FIG>. A surface that is of the lifting member <NUM> and that faces away from the lamination surface M3 is provided with a protrusion portion 231a, and the protrusion portion 231a is cylindrical. In some other embodiments, the protrusion portion 231a may alternatively be square. A hanging hole 231a1 is disposed on the protrusion portion 231a. The hanging hole 231a1 extends along the x axis and penetrates through the protrusion portion 231a. <FIG> is a schematic diagram of an assembly structure of a lifting member <NUM> and a tower spring in the rotation mechanism <NUM> shown in <FIG>. The smaller-diameter end of the tower spring is hooked in the hanging hole 231a1. In this way, the tower spring is detachablely connected to the lifting member <NUM>, to facilitate a connection operation. In some other embodiments, in addition to a hooking connection, the tower spring and the lifting member <NUM> may be detachablely connected by using a clamping connection, a threaded connection, or the like. This is not specifically limited herein.

Based on the foregoing embodiment, because the distance between the lifting member <NUM> and the shaft cover <NUM> is small, if the tower spring is directly connected between the lifting member <NUM> and the shaft cover <NUM>, problems such as much assembling difficulty and mounting inconvenience may be caused due to narrow operation space.

To resolve the foregoing problem, referring to <FIG> is an exploded view of a lifting member <NUM> in the rotation mechanism <NUM> shown in <FIG>. The lifting member <NUM> includes a lifting member body <NUM> and a buckling member <NUM>. The lifting member body <NUM> includes a first surface m1 and a second surface m2. The first surface m1 is used for lamination with a part of the foldable screen <NUM>, and the second surface m2 is opposite to the first surface m1. When the lifting member <NUM> is applied to the rotation mechanism <NUM> shown in <FIG>, the first surface m1 is a surface that is of the lifting member body <NUM> and that is away from the tower spring, and the second surface m2 is a surface that is of the lifting member body <NUM> and that is close to the tower spring.

A mounting hole 2311a is disposed on the lifting member body <NUM>. The mounting hole 2311a penetrates through the lifting member body <NUM> along a lifting direction of the lifting member <NUM>, one end of the mounting hole 2311a is located on the first surface m1, and the other end of the mounting hole 2311a is located on the second surface m2. The mounting hole 2311a allows the buckling member <NUM> to be mounted into the mounting hole 2311a from one end that is of the mounting hole 2311a and that is located on the first surface m1. After the buckling member <NUM> is mounted into the mounting hole 2311a, the mounting hole 2311a also prevents the buckling member <NUM> from being separated from the mounting hole 2311a from one end that is of the mounting hole 2311a and that is located on the second surface m2.

To achieve the foregoing objective, in some embodiments, still referring to <FIG>, the mounting hole 2311a includes a first hole segment 2311a1 and a second hole segment 2311a2. The first hole segment 2311a1 is located between the first surface m1 and the second hole segment 2311a2, and the second hole segment 2311a2 is located between the first hole segment 2311a1 and the second surface m2. When the lifting member <NUM> is applied to the rotation mechanism <NUM> shown in <FIG>, the second hole segment 2311a2 is located on a side that is of the first hole segment 2311a1 and that is close to the tower spring. A cross section area of the second hole segment 2311a2 is smaller than a cross section area of the first hole segment 2311a1.

Based on the foregoing embodiment, still referring to <FIG>, the buckling member <NUM> includes a supporting portion 2312a and a fastening portion 2312b fastened to the supporting portion 2312a. The supporting portion 2312a matches and is accommodated in the first hole segment 2311a1, and the fastening portion 2312b matches and is accommodated in the second hole segment 2311a2. In this way, the mounting hole 2311a allows the buckling member <NUM> to be mounted into the mounting hole 2311a from one end that is of the mounting hole 2311a and that is located on the first surface m1. Based on this, a step surface is formed between an inner wall of the first hole segment 2311a1 and an inner wall of the second hole segment 2311a2, and the supporting portion 2312a of the buckling member <NUM> is stopped and limited by using the step surface, so that the buckling member <NUM> can be prevented from being separated from the mounting hole 2311a from one end that is of the mounting hole 2311a and that is located on the second surface m2. Certainly, the mounting hole 2311a and the buckling member <NUM> may be in another structural from provided that the foregoing objective is achieved. This is not specifically limited herein.

Based on the foregoing embodiment, the smaller-diameter end of the tower spring is detachably connected to the buckling member <NUM> in the lifting member <NUM>. Specifically, still referring to <FIG>, when the buckling member <NUM> is mounted into the mounting hole 2311a, a part of the fastening portion 2312b protrudes from the mounting hole 2311a from the second surface m2, and the part protruding from the mounting hole 2311a forms the protrusion portion 231a in <FIG> and <FIG>. The smaller-diameter end of the tower spring is hooked to the hanging hole 231a1 in the protruding portion 231a, so that the tower spring is detachablely connected to the buckling member <NUM>. In some other embodiments, the smaller-diameter end of the tower spring may alternatively be non-detachably connected to the lifting member <NUM>. This is not specifically limited herein.

In this way, the lifting member <NUM>, the tower spring and the shaft cover <NUM> may be assembled as follows: First, the larger-diameter end of the tower spring is fastened to the inner surface of the shaft cover <NUM>; next, the lifting member body <NUM> of the lifting member <NUM> is disposed on a side that is of the tower spring and that is away from the shaft cover <NUM>, and the mounting hole 2311a is opposite to the smaller-diameter end of the tower spring; then, the smaller-diameter end of the tower spring is pulled out from the mounting hole 2311a to a side that is of the lifting member body <NUM> and that is away from the shaft cover <NUM>, and is hooked to the buckling member <NUM>; and finally, the buckling member <NUM> hooked with the tower spring is mounted into the mounting hole 2311a of the lifting member body <NUM>, to complete assembly. This assembly operation is not difficult and can be easily implemented, and operation of mounting the tower spring in a narrow gap between the lifting member <NUM> and the shaft cover <NUM> is avoided.

In the foregoing embodiment, because the tower spring forms the forcing structure <NUM>, the smaller-diameter end of the tower spring is connected to the buckling member <NUM>, and the diameter of the smaller-diameter end of the tower spring is smaller, a size of the cross section of the mounting hole 2311a can be designed to be small while the smaller-diameter end of the tower spring can penetrate through the mounting hole 2311a to be hooked to the buckling member <NUM>, so as to ensure structural strength of the lifting member body <NUM>.

Still referring to <FIG>, on the buckling member <NUM>, a surface that is of the supporting portion 2312a and that is away from the fastening portion 2312b is a third surface m3, and the third surface m3 is joined to the first surface m1 of the lifting member body <NUM>, to form the lamination surface M3 of the lifting member <NUM>. In some embodiments, after the buckling member <NUM> is mounted into the mounting hole 2311a in the lifting member body <NUM>, the third surface m3 is flush with the first surface m1, to ensure flatness of the lamination surface M3. In some other embodiments, the third surface m3 may alternatively be located in the mounting hole 2311a, or may protrude outside the mounting hole 2311a.

In some other embodiments, the tower spring may be replaced with a cylindrical spiral spring, a spring sheet, a leaf spring, a rubber band, or the like. In some other embodiments, the tower spring may alternatively be replaced with a magnetic body assembly including a magnetic body and a magnetic conductive member; the magnetic body in the magnetic body assembly includes, but is not limited to a magnet and a magnetic steel; and one of the magnetic body and the magnetic conductive member is fastened to the lifting member <NUM> and the other is fastened to the shaft cover <NUM>, and the magnetic body and the magnetic conductive member are spaced apart from each other. In this way, the magnetic body and the magnetic conductive member are attracted to each other to generate a magnetic attraction force, so as to drive the lifting member <NUM> to descend by using the magnetic attraction force.

To cooperate with the tower spring to drive the lifting member <NUM> to ascend or descend, referring back to <FIG> and <FIG>, the first supporting member <NUM> is relatively fastened to the first swing arm <NUM>. Specifically, the first supporting member <NUM> may be fastened to the first swing arm <NUM> by using an adhesive, or the first supporting member <NUM> and the first swing arm <NUM> may be an integral structural member. The second supporting member <NUM> is relatively fastened to the second swing arm <NUM>. Specifically, the second supporting member <NUM> may be fastened to the second swing arm <NUM> by using an adhesive, or the second supporting member <NUM> and the second swing arm <NUM> may be an integral structural member.

<FIG> is a schematic diagram of structures of the rotation mechanism <NUM> shown in <FIG> when a first swing arm <NUM> and a second swing arm <NUM> rotate from an unfolded position to a folded position. (a) in <FIG> is a schematic diagram of the structure of the rotation mechanism <NUM> when the first swing arm <NUM> and the second swing arm <NUM> are in the unfolded position. In this position, the lifting member <NUM> is supported on the first supporting member <NUM> and the second supporting member <NUM>, and the tower spring is stretched and deformed, to apply an elastic tension force F directed to the shaft cover <NUM> to the lifting member <NUM>. When the first swing arm <NUM> and the second swing arm <NUM> swing along the direction a1 and the direction a2 respectively, from the unfolded position to the folded position, the first supporting member <NUM> and the second supporting member <NUM> move along the direction b1 and the direction b2 respectively, toward the shaft cover <NUM>, and the lifting member <NUM> descends under an action of the elastic tension force F of the tower spring. (b) in <FIG> is a schematic diagram of the structure of the rotation mechanism <NUM> when the first swing arm <NUM> and the second swing arm <NUM> are in the folded position. In this position, the lifting member <NUM> descends to a lowest position, so as to avoid a middle portion of the foldable screen and avoid a damage to the foldable screen.

In contrast to the foregoing process, when the first swing arm <NUM> and the second swing arm <NUM> swing from the folded position to the unfolded position, the first supporting member <NUM> and the second supporting member <NUM> move toward the lifting member <NUM>, to apply a support force to the lifting member <NUM>, and the support force can overcome the elastic tensile force of the tower spring, to drive the lifting member <NUM> to ascend, so as to support the middle portion of the foldable screen.

Therefore, the first supporting member <NUM> and the second supporting member <NUM> cooperate with the tower spring to ascend or descend to drive the lifting member <NUM>, so as to stably support the middle portion of the foldable screen when the first swing arm <NUM> and the second swing arm <NUM> are in the unfolded position, and avoid the middle portion of the foldable screen when the first swing arm <NUM> and the second swing arm <NUM> are in the folded position.

In some other embodiments, the rotation mechanism <NUM> may alternatively include only the first supporting member <NUM> but not include the second supporting member <NUM>. Based on this, the first supporting member <NUM> may be relatively fastened to the second swing arm <NUM> in addition to the first swing arm <NUM>. In this way, when the first swing arm <NUM> and the second swing arm <NUM> are in the unfolded position, the lifting member <NUM> is supported only on the first supporting member <NUM>. When the first swing arm <NUM> and the second swing arm <NUM> swing from the folded position to the unfolded position, the first supporting member <NUM> moves toward the lifting member <NUM>, to apply a support force to the lifting member <NUM>. In still some other embodiments, the rotation mechanism <NUM> may alternatively include only the second supporting member <NUM>, but not include the first supporting member <NUM>.

In the rotation mechanism <NUM> provided in this embodiment of this application, because the tower spring is directly connected between the lifting member <NUM> and the shaft cover <NUM>, the thickness of the rotation mechanism <NUM> is small, thereby facilitating thinning of the foldable screen terminal.

When the first swing arm <NUM> and the second swing arm <NUM> are in the folded position, to maintain a position of the lifting member <NUM> and prevent the lifting member <NUM> from moving due to an external force or a gravity of the lifting member <NUM>, referring back to <FIG>, a first stop member <NUM> is fastened on the shaft cover <NUM>. The first stop member <NUM> includes a first surface region 2324a. A quantity of first surface regions 2324a is two, and the two first surface regions 2324a are disposed symmetrically with respect to a first plane (not shown in the figure). The first plane is parallel to the Z axis. For example, the first plane is parallel to an XZ plane. In some other examples, the first plane may alternatively be parallel to an YZ plane.

Correspondingly, referring to <FIG>, a second stop member 231c is fastened on the lifting member <NUM>. The second stop member 231c includes a second surface region 231c1. A quantity of second surface regions 231c1 is two, and the two second surface regions 231c1 are disposed symmetrically with respect to a second plane (not shown in the figure). The second plane is parallel to the lifting direction (that is, the Z axis direction) of the lifting member <NUM>, for example, the second plane is parallel to the XZ plane. In some other examples, the second plane may alternatively be parallel to the YZ plane.

<FIG> is a schematic diagram showing relative positions of a first stop member <NUM> and a second stop member 231c in the rotation mechanism <NUM> shown in <FIG> when a first swing arm <NUM> and a second swing arm <NUM> are in an unfolded position and a folded position. (a) in <FIG> is a schematic diagram showing the relative position of the first stop member <NUM> and the second stop member 231c in the rotation mechanism <NUM> when the first swing arm <NUM> and the second swing arm <NUM> are in the unfolded position. In this position, the first stop member <NUM> and the second stop member 231c are spaced apart from each other, and the first surface region 2324a of the first stop member <NUM> and the second surface region 231c1 of the second stop member 231c are spaced apart from each other.

When the first swing arm <NUM> and the second swing arm <NUM> swing from the unfolded position to the folded position, the second stop member 231c moves toward the first stop member <NUM>, to drive the second surface region 231c1 to move toward the first surface region 2324a.

(b) in <FIG> is a schematic diagram showing the relative position of the first stop member <NUM> and the second stop member 231c in the rotation mechanism <NUM> when the first swing arm <NUM> and the second swing arm <NUM> are in the folded position. In this position, the two first surface regions 2324a of the first stop member <NUM> are respectively laminated with the two second surface regions 231c1 of the second stop member 231c. In this way, the two second surface regions 231c1 of the second stop member 231c are stopped by the two first surface regions 2324a of the first stop member <NUM>, to prevent the lifting member <NUM> from descending further. Based on this, because the tower spring is connected between the lifting member <NUM> and the shaft cover <NUM>, and the tower spring can resist deformation, the tower spring can prevent the lifting member <NUM> from moving away from the shaft cover <NUM>. Therefore, the first stop member <NUM> and the second stop member 231c cooperate with the tower spring to limit the lifting member <NUM>, so as to maintain the position of the lifting member <NUM> when the first swing arm <NUM> and the second swing arm <NUM> are in the folded position, and prevent the position of the lifting member <NUM> from moving due to an external force.

Based on the foregoing embodiment, optionally, the tower spring may be in a free state when the first swing arm <NUM> and the second swing arm <NUM> are in the folded position. In this way, the first stop member <NUM> and the second stop member 231c cooperate with the tower spring to limit the lifting member <NUM> to a fixed position, so as to maintain the position of the lifting member <NUM> to some extent, and prevent an external impact force from forcing the position of the lifting member <NUM> to change.

Optionally, when the first swing arm <NUM> and the second swing arm <NUM> are in the folded position, the tower spring only restores partial deformation and does not completely restore to be in the free state, that is, the tower spring is still in tensile deformation. Therefore, an elastic tension force that is applied by the tower spring to the lifting member <NUM> and that is directed to the shaft cover <NUM> is greater than zero. The elastic tensile force presses the lifting member <NUM> against the first stop member <NUM>, to improve stability of the position of the lifting member <NUM> and prevent the external impact force from forcing the position of the lifting member <NUM> to change. In addition, in this embodiment, it is unnecessary to accurately calculate an elasticity amount and a telescopic amount of the tower spring, so as to ensure that the first surface region 2324a is laminated with the second surface region 231c1 while the tower spring is just restored to the free state, thereby facilitating selection and production of the tower spring.

Based on the foregoing embodiment, to avoid that when the foldable screen terminal is impacted by the external force, the shaft cover <NUM> in the rotation mechanism <NUM> transfers the external impact force to the lifting member <NUM> through the first stop member <NUM> and the second stop member 231c, thereby forcing the lifting member <NUM> to move relative to the shaft cover <NUM>. In some embodiments, referring to <FIG>, both the first surface region 2324a and the second surface region 231c1 are inclined relative to the lamination surface M3 of the lifting member <NUM>, and an inclination angle is θ. When the first swing arm <NUM> and the second swing arm <NUM> are in the folded position, the two first surface regions 2324a are respectively laminated with the two second surface regions 231c1, and a frictional coefficient µ between each first surface region 2324a and the corresponding second surface region 231c1 is greater than a reciprocal of a tangent value of the inclination angle θ of the first surface region 2324a or the second surface region 231c1. That is, µ > <NUM>/tanθ. In this way, when an outer surface of the shaft cover <NUM> is impacted by an external force, the external force is transferred to an inner side of the shaft cover <NUM> to the first stop member <NUM>, and the first stop member <NUM> cannot drive the second stop member 231c and the lifting member <NUM> to move. Therefore, the position of the lifting member <NUM> is further maintained.

In the foregoing embodiment, the quantity of the first surface regions 2324a on the first stop member <NUM> and the quantity of the second surface regions 231c1 on the second stop member 231c are both two, the two first surface regions 2324a are disposed symmetrically, and the second surface regions 231c1 are disposed symmetrically. Therefore, forces applied when the first stop member <NUM> abuts against the second stop member 231c are balanced, to prevent the rotation mechanism <NUM> from being stuck during lifting of the lifting member <NUM>.

In some other embodiments, the quantity of first surface regions 2324a on the first stop member <NUM> may alternatively be one, three, four, or more. Correspondingly, the quantity of the second surface regions 231c1 on the second stop member 231c may be one, three, four, or more.

For example, <FIG> is a schematic diagram showing relative positions of a first stop member <NUM> and a second stop member 231c in a rotation mechanism <NUM> according to some other embodiments of this application when a first swing arm <NUM> and a second swing arm <NUM> are in an unfolded position and a folded position. (a) in <FIG> is a schematic diagram showing the relative position of the first stop member <NUM> and the second stop member 231c in the rotation mechanism <NUM> when the first swing arm <NUM> and the second swing arm <NUM> are in the unfolded position. (b) in <FIG> is a schematic diagram showing the relative position of the first stop member <NUM> and the second stop member 231c in the rotation mechanism <NUM> when the first swing arm <NUM> and the second swing arm <NUM> are in the folded position. A difference between the first stop member <NUM> and the second stop member 231c in this embodiment and the first stop member <NUM> and the second stop member 231c in the rotation mechanism <NUM> shown in <FIG> is as follows: In this embodiment, the quantity of the first surface regions 2324a on the first stop member <NUM> is one, and the quantity of the second surface regions 231c1 on the second stop member 231c is also one.

Based on the rotation mechanism <NUM> described in any one of the foregoing embodiments, to prevent the lifting member <NUM> from being misaligned during lifting, in some embodiments, referring back to <FIG>, the rotation mechanism <NUM> further includes a guide post <NUM>. The guide post <NUM> is disposed on the shaft cover <NUM>, and an axis direction of the guide post <NUM> coincides with the lifting direction of the lifting member. A quantity of the guide posts <NUM> is two, and the two guide posts <NUM> are spaced apart from each other along a length direction of the shaft cover <NUM> (that is, the X axis direction). In some other embodiments, the quantity of the guide posts <NUM> may alternatively be one, three, four, or the like. This is not specifically limited herein.

Correspondingly, referring to <FIG>, the rotation mechanism <NUM> further includes a guide sleeve 231b. The guide sleeve 231b is disposed on the lifting member <NUM>, and an axis direction of the guide sleeve 231b coincides with the lifting direction of the lifting member <NUM>. A quantity of the guide sleeves 231b is two. When the quantity of the guide posts <NUM> is one, three, or four, correspondingly, the quantity of the guide sleeves 231b is also one, three, or four.

<FIG> is a schematic diagram showing relative positions of a guide post <NUM> and a guide sleeve 231b in the rotation mechanism <NUM> shown in <FIG> when a first swing arm <NUM> and a second swing arm <NUM> are in an unfolded position and a folded position. (a) in <FIG> is a schematic diagram showing the relative position of the guide post <NUM> and the guide sleeve 231b in the rotation mechanism <NUM> when the first swing arm <NUM> and the second swing arm <NUM> are in the unfolded position. (b) in <FIG> is a schematic diagram showing the relative position of the guide post <NUM> and the guide sleeve 231b in the rotation mechanism <NUM> when the first swing arm <NUM> and the second swing arm <NUM> are in the folded position. The guide sleeve 231b is disposed outside the guide post <NUM>, and the guide post <NUM> slides in the guide sleeve 231b relative to the guide sleeve 231b when the lifting member <NUM> descends or ascends relative to the shaft cover <NUM>. In this way, the guide post <NUM> and the guide sleeve 231b can guide a lifting movement of the lifting member <NUM>, to prevent the lifting member <NUM> from being misaligned during lifting.

In some other embodiments, a disposed position of the guide post <NUM> and a disposed position of the guide sleeve 231b are interchangeable, that is, the guide post <NUM> is disposed on the lifting member <NUM>, and the guide sleeve 231b is disposed on the shaft cover <NUM>.

<FIG> is a schematic diagram of structures of a rotation mechanism <NUM> according to some other embodiments of this application when a first swing arm <NUM> and a second swing arm <NUM> rotate from an unfolded position to a folded position. (a) in <FIG> is a schematic diagram of the structure of the rotation mechanism <NUM> when the first swing arm <NUM> and the second swing arm <NUM> are in the unfolded position. (b) in <FIG> is a schematic diagram of the structure of the rotation mechanism <NUM> when the first swing arm <NUM> and the second swing arm <NUM> are in the folded position. A difference between the rotation mechanism <NUM> shown in this embodiment and the rotation mechanism <NUM> shown in <FIG> is as follows: In this embodiment, the forcing structure <NUM> is a cylindrical spiral spring. A movement manner and a forcing manner of the cylindrical spiral spring during lifting of the lifting member <NUM> are the same as the movement manner and the forcing manner of the tower spring described above.

<FIG> is a schematic diagram of structures of a rotation mechanism <NUM> according to still some other embodiments of this application when a first swing arm <NUM> and a second swing arm <NUM> rotate from an unfolded position to a folded position. A difference between the rotation mechanism <NUM> shown in this embodiment and the rotation mechanism <NUM> shown in <FIG> is as follows: In this embodiment, the forcing structure <NUM> is a magnetic body assembly including a magnetic body <NUM> and a magnetic conductive member <NUM>. The magnetic body <NUM> in the magnetic body assembly includes, but is not limited to, a magnet and a magnetic steel. The magnetic body <NUM> is fastened on the shaft cover <NUM>, and the magnetic conductive member <NUM> is fastened on the lifting member <NUM>.

When the first swing arm <NUM> and the second swing arm <NUM> are in the unfolded position, (a) in <FIG> is a schematic diagram of the structure of the rotation mechanism <NUM> when the first swing arm <NUM> and the second swing arm <NUM> are in the unfolded position. The magnetic body <NUM> and the magnetic conductive member <NUM> are spaced apart from each other, and the magnetic body <NUM> and the magnetic conductive member <NUM> are attracted to each other, to generate a magnetic attraction force F. When the first swing arm <NUM> and the second swing arm <NUM> swing along the direction a1 and the direction a2 respectively, from the unfolded position to the folded position, the first supporting member <NUM> and the second supporting member <NUM> respectively move along the direction b1 and the direction b2, toward the shaft cover <NUM>, and the lifting member <NUM> descends under an action of the magnetic attraction force F, to drive the magnetic conductive member <NUM> to move toward the magnetic body <NUM>. (b) in <FIG> is a schematic diagram of the structure of the rotation mechanism <NUM> when the first swing arm <NUM> and the second swing arm <NUM> are in the folded position. In this position, the magnetic conductive member <NUM> and the magnetic body <NUM> attract each other, and the lifting member <NUM> descends to a lowest position. Therefore, the middle portion of the foldable screen can be avoided, to avoid the damage to the foldable screen.

In contrast to the foregoing process, when the first swing arm <NUM> and the second swing arm <NUM> swing from the folded position to the unfolded position, the first supporting member <NUM> and the second supporting member <NUM> move toward the lifting member <NUM>, to apply a support force to the lifting member <NUM>, and the support force can overcome the elastic tensile force between the magnetic conductive member <NUM> and the magnetic body <NUM>, to drive the lifting member <NUM> to ascend, so as to support the middle portion of the foldable screen.

Therefore, the first supporting member <NUM> and the second supporting member <NUM> cooperate with the magnetic conductive member <NUM> and the magnetic body <NUM> to drive the lifting member <NUM> to ascend or descend, so as to stably support the middle portion of the foldable screen when the first swing arm <NUM> and the second swing arm <NUM> are in the unfolded position, and avoid the middle portion of the foldable screen when the first swing arm <NUM> and the second swing arm <NUM> are in the folded position.

In some other embodiments, a disposing position of the magnetic bodies <NUM> and a disposing position of the magnets <NUM> are interchangeable. That is, the magnetic body <NUM> is disposed on the lifting member <NUM>, and the magnetic conductive member <NUM> is disposed on the shaft cover <NUM>.

Based on descriptions of the foregoing embodiments, in the rotation mechanism <NUM> provided in this embodiment of this application, because the forcing structure <NUM> is directly connected between the lifting member <NUM> and the shaft cover <NUM>, the thickness of the rotation mechanism <NUM> is small, thereby facilitating thinning of the foldable screen terminal.

Claim 1:
A rotation mechanism (<NUM>), comprising a lifting member (<NUM>), a shaft cover (<NUM>), a first swing arm (<NUM>), a second swing arm (<NUM>), a forcing structure (<NUM>), a first supporting member (<NUM>), and a second supporting member (<NUM>); wherein
the lifting member (<NUM>) comprises a lamination surface (M3), and the lamination surface (M3) is configured for lamination with a flexible part (<NUM>) of a foldable screen (<NUM>) such that the lamination surface (M3) fastens and supports the flexible part (<NUM>) of the foldable screen (<NUM>) to the lifting member (<NUM>); and the shaft cover (<NUM>) is located on a side that is of the lifting member (<NUM>) and that is away from the lamination surface (M3);
the first swing arm (<NUM>) and the second swing arm (<NUM>) are respectively located on two opposite sides of the lifting member (<NUM>), and the first swing arm (<NUM>) and the second swing arm (<NUM>) are each configured such that, when in use, they swing between an unfolded position and a folded position relative to the shaft cover (<NUM>);
the forcing structure (<NUM>) is located between the lifting member (<NUM>) and the shaft cover (<NUM>), one end of the forcing structure (<NUM>) is connected to the lifting member (<NUM>), and the other end thereof is connected to the shaft cover (<NUM>); and the first supporting member (<NUM>) is fastened to the first swing arm (<NUM>) and the second supporting member (<NUM>) is fastened to the second swing arm (<NUM>); wherein the rotation mechanism (<NUM>) is configured such that:
when the first swing arm (<NUM>) and the second swing arm (<NUM>) are in the unfolded position, the lifting member (<NUM>) is supported on the first supporting member (<NUM>) and the second supporting member (<NUM>), and the forcing structure (<NUM>) is configured such that, when in use, it applies a tensile force directed to the shaft cover (<NUM>) to the lifting member (<NUM>); and when the first swing arm (<NUM>) and the second swing arm (<NUM>) swing from the unfolded position to the folded position, the first supporting member (<NUM>) and the second supporting member (<NUM>) are each configured such that, when in use, they move toward the shaft cover (<NUM>), and the lifting member (<NUM>) is configured such that, when in use, it descends under an action of the tension force of the forcing structure (<NUM>).