Hinge assembly and electronic device

Abstract

The application discloses a hinge assembly and an electronic device, and belongs to the technical field of electronic product design. The hinge assembly comprises a base, a door plate, a connecting support and a hinge cover. The hinge cover and the base are connected through the connecting support. The door plate is rotatably arranged on the base, so that the hinge assembly can be switched between an unfolded state and a folded state. At least one of the door plate and the connecting support is provided with a limiting portion. When the hinge assembly is in the unfolded state, the door plate and the connecting support are limited and matched through the limiting portion, so as to limit the movement of the door plate to the side away from the hinge cover.

Description

Technical Field

[0001] This application belongs to the field of electronic product technology, specifically relating to a hinge assembly and an electronic device. Background Technology

[0002] With the advancement and development of electronic devices, foldable screen electronic devices have become a current trend. Foldable screen electronic devices generally include a first housing, a second housing, and a hinge assembly. The hinge assembly rotatably connects the first and second housings, enabling the electronic device to have folding and unfolding functions.

[0003] In foldable electronic devices, to meet the requirements of a thin and light overall device and a large battery capacity, the flexible circuit board connecting the first and second housings is routed into the hinge cover of the hinge assembly. This maximizes the use of the internal space of the hinge assembly, enabling the battery to be larger and the overall device to be thinner. The hinge assembly is rotatably equipped with a flexible display screen for supporting the electronic device and a door panel for forming the teardrop-shaped folding area of ​​the flexible display screen. During the actual installation process, the flexible circuit board passes through the gap between the door panel and the hinge cover, so that part of the flexible circuit board is routed into the hinge cover.

[0004] However, when the electronic device is in the unfolded state, the flexible circuit board inside the hinge cover will bend and tilt upwards, that is, the flexible circuit board will push the door panel upwards. This will cause local deformation of the door panel, which in turn will cause obvious local bulges on the flexible display screen above the door panel. In other words, the flexible display screen is prone to deformation, which can easily affect the display effect of the flexible display screen. Summary of the Invention

[0005] The purpose of this application is to provide a hinge assembly and an electronic device that can solve the problem that flexible displays of electronic devices in related technologies are prone to deformation.

[0006] This application provides a hinge assembly, including a base, a door panel, a connecting bracket, and a hinge cover.

[0007] The hinge cover and the base are connected by the connecting bracket, and the door panel is rotatably disposed on the base so that the hinge assembly can switch between an unfolded state and a folded state;

[0008] At least one of the door panel and the connecting bracket is provided with a limiting part. When the hinge assembly is in the unfolded state, the door panel and the connecting bracket are limited by the limiting part to restrict the door panel from moving to the side away from the hinge cover.

[0009] This application provides an electronic device including a first housing, a second housing, and the hinge assembly described above. The first housing and the second housing are rotatably connected by the hinge assembly. During the mutual rotation of the first housing and the second housing, the electronic device switches between an unfolded state and a folded state.

[0010] In this embodiment, the hinge assembly's door panel is rotatably mounted on the base, allowing the hinge assembly to switch between an unfolded state and a folded state. Since at least one of the door panel and the connecting bracket is provided with a limiting part, and when the hinge assembly is in the unfolded state, the door panel and the connecting bracket are limited by the limiting part to restrict the door panel from moving away from the hinge cover. That is, when the hinge assembly is in the unfolded state, the connecting bracket can restrict the door panel from moving toward the flexible display screen of the electronic device by the limiting part, so as to avoid large deformation of the flexible display screen caused by the large deformation of the door panel under the action of the flexible circuit board of the electronic device, thus avoiding affecting the overall display effect of the flexible display screen. Attached Figure Description

[0011] Figure 1 This is a partial structural schematic diagram of the first electronic device disclosed in the embodiments of this application;

[0012] Figure 2 and Figure 3 These are schematic diagrams of the door panel with limiting parts and reinforcing members from different perspectives disclosed in the embodiments of this application;

[0013] Figure 4 This is a partial structural schematic diagram of the second electronic device disclosed in an embodiment of this application;

[0014] Figure 5 and Figure 6 This is a partial cross-sectional view of the structure of the second electronic device disclosed in an embodiment of this application;

[0015] Figure 7 This is a partial structural schematic diagram of the third electronic device disclosed in the embodiments of this application;

[0016] Figure 8 and Figure 9 This is a partial cross-sectional view of the third electronic device disclosed in the embodiments of this application.

[0017] Explanation of reference numerals in the attached figures:

[0018] 100 - Base, 110 - First hinge body, 120 - Second hinge body;

[0019] 200-Door panel, 210-First surface, 211-Limiting groove, 220-First door panel, 230-Second door panel;

[0020] 300 - Connecting bracket;

[0021] 400 - Hinge cover; 410 - Flexible circuit board accommodating space;

[0022] 500 - Limiting part, 510 - First limiting part, 520 - Second limiting part, 530 - Third limiting part, 540 - Fourth limiting part;

[0023] 600 - Reinforcing member, 610 - Raised rib;

[0024] 710 - Flexible circuit board, 720 - First housing, 730 - Second housing. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0026] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] The hinge assembly disclosed in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0028] Please refer to Figures 1-9 This application discloses a hinge assembly, which includes a base 100, a door panel 200, a connecting bracket 300, and a hinge cover 400.

[0029] The hinge assembly disclosed in this application is applied to an electronic device. The hinge assembly can be rotatably connected to the first housing 720 and the second housing 730 of the electronic device described below, so that the electronic device can switch between a folded state and an unfolded state via the hinge assembly.

[0030] The base 100 is the fundamental component of the hinge assembly. The base 100 may include a first hinge body 110 and a second hinge body 120 spaced apart. A connecting bracket 300 connects the first hinge body 110 and the second hinge body 120, and simultaneously fixes the first hinge body 110, the second hinge body 120, and the hinge cover 400 together with screws. That is, the hinge cover 400 and the base 100 are connected via the connecting bracket 300. The door panel 200 is rotatably mounted on the base 100, meaning it is rotatably mounted on the first hinge body 110 and the second hinge body 120, allowing the hinge assembly to switch between an unfolded state and a folded state. Specifically, the door panel 200 is rotatably mounted on the base 100 via a sliding groove structure. Optionally, to reduce the overall weight of the hinge assembly, the door panel 200 is generally made of a low-density plastic material.

[0031] The door panel 200 and the connecting bracket 300 can be used together to support the flexible display screen of the electronic device, and the door panel 200 can be used to form the folding area of ​​the teardrop-shaped flexible display screen, while the hinge cover 400 can be used to protect other components within the hinge assembly.

[0032] At least one of the door panel 200 and the connecting bracket 300 is provided with a limiting part 500. When the hinge assembly is in the unfolded state, that is, when the electronic device is in the unfolded state, the door panel 200 and the connecting bracket 300 are limited by the limiting part 500 to restrict the door panel 200 from moving away from the hinge cover 400. That is, the limiting part 500 can restrict the door panel 200 from moving toward the side where the flexible display screen is located, so as to prevent the door panel 200 from pressing the flexible display screen and causing the flexible display screen to deform.

[0033] Specifically, during the transition of the hinge assembly from the folded state to the unfolded state, the door panel 200 rotates relative to the base 100, so that the door panel 200 and the connecting bracket 300 gradually engage through the limiting part 500. During the transition of the hinge assembly from the unfolded state to the folded state, the door panel 200 rotates relative to the base 100, so that the door panel 200 and the connecting bracket 300 gradually disengage from the limiting part 500, that is, they no longer engage through the limiting part 500.

[0034] In this application, since the door panel 200 is rotatably mounted on the base 100 via the sliding groove structure, the sliding groove structure also has a certain limiting effect on the door panel 200. Thus, under the combined limitation of the sliding groove structure and the limiting part 500, the door panel 200 is more stably mounted on the hinge assembly, that is, it is less likely to deform.

[0035] In this embodiment, the hinge assembly door panel 200 is rotatably disposed on the base 100 to allow the hinge assembly to switch between an unfolded state and a folded state. Since at least one of the door panel 200 and the connecting bracket 300 is provided with a limiting part 500, and when the hinge assembly is in the unfolded state, the door panel 200 and the connecting bracket 300 are limited by the limiting part 500 to restrict the door panel 200 from moving away from the hinge cover 400. That is, when the hinge assembly is in the unfolded state, the connecting bracket 300 can restrict the door panel 200 from moving toward the flexible display screen of the electronic device by the limiting part 500, so as to avoid large deformation of the flexible display screen caused by the large deformation of the door panel 200 under the action of the flexible circuit board 710 of the electronic device, thus avoiding affecting the overall display effect of the flexible display screen.

[0036] Alternatively, please refer to Figures 4-6 The door panel 200 is provided with a limiting part 500, which is connected to the door panel 200 and protrudes towards the connecting bracket 300. That is, in the width direction of the hinge assembly, the limiting part 500 protrudes relative to the connecting bracket 300. When the hinge assembly is in the unfolded state, in the first direction, the limiting part 500 and the connecting bracket 300 are mutually limiting and engaged. That is, when the hinge assembly is in the unfolded state, the door panel 200 contacts the connecting bracket 300 through the limiting part 500 and is mutually limiting and engaged with the connecting bracket 300. The first direction is the direction from the hinge cover 400 to the connecting bracket 300. That is, in the first direction, the connecting bracket 300 restricts the movement of the door panel 200 away from the hinge cover 400 by restricting the movement of the limiting part 500.

[0037] Specifically, the connecting bracket 300 has a second surface facing the hinge cover 400, and the limiting portion 500 can abut against this second surface to achieve a limiting fit between the limiting portion 500 and the connecting bracket 300. Optionally, the limiting portion 500 and the connecting bracket 300 can be configured as an interference fit; however, this embodiment does not impose specific limitations on this.

[0038] Optionally, the connecting bracket 300 may have a groove on the side facing the hinge cover 400. The bottom surface of the groove may be the aforementioned second surface. That is, when the hinge assembly is in the unfolded state, at least a portion of the limiting part 500 may be located within the groove, and the limiting part 500 abuts against the bottom surface of the groove to achieve a limiting engagement between the limiting part 500 and the connecting bracket 300. Of course, in other embodiments, the edge of the second surface abuts against the limiting part 500. This edge may be a flat surface, meaning that a groove is not required for abutment against the limiting part 500.

[0039] Optionally, the side of the limiting part 500 facing away from the hinge cover 400 can be coplanar with the side of the door panel 200 facing away from the hinge cover 400. That is, in the thickness direction of the electronic device, the height of the side of the limiting part 500 facing away from the hinge cover 400 is equal to the height of the side of the door panel 200 facing away from the hinge cover 400, and the side of the limiting part 500 facing away from the hinge cover 400 is used for limiting cooperation with the connecting bracket 300.

[0040] In another embodiment, the side of the limiting part 500 facing away from the hinge cover 400 is recessed relative to the side of the door panel 200 facing away from the hinge cover 400. That is, in the thickness direction of the electronic device, the height of the side of the limiting part 500 facing away from the hinge cover 400 is less than the height of the side of the door panel 200 facing away from the hinge cover 400. This allows the limiting part 500 to engage with the connecting bracket 300 while not increasing the height of the connecting bracket 300. In other words, the height of the surface of the door panel 200 supporting the flexible display screen and the height of the surface of the connecting bracket 300 supporting the flexible display screen can be the same, thereby ensuring that the door panel 200 and the connecting bracket 300 can stably support the flexible display screen together.

[0041] Optionally, the connecting bracket 300 is provided with a limiting part 500, that is, the limiting part 500 is connected to the connecting bracket 300 and the limiting part 500 protrudes towards the door panel 200, that is, in the width direction of the hinge assembly, the limiting part 500 protrudes relative to the door panel 200. The side of the door panel 200 facing away from the hinge cover 400 is a first surface 210, which is the surface of the door panel 200 that supports the flexible display screen. The first surface 210 can be a relatively smooth surface. When the hinge assembly is in the unfolded state, in a first direction, the limiting part 500 can be limited and cooperated with the first surface 210. The first direction is the direction from the hinge cover 400 to the connecting bracket 300. That is, at this time, in the thickness direction of the electronic device, the height of the limiting part 500 is greater than the height of the first surface 210. That is, between the limiting part 500 and the door panel 200, the limiting part 500 is set closer to the flexible display screen.

[0042] In another embodiment, please refer to Figures 7-9A limiting groove 211 is formed on the first surface 210. When the hinge assembly is in the unfolded state, the limiting part 500 is located within the limiting groove 211 and is limited and engaged with the limiting groove 211 in the first direction. That is, at this time, in the thickness direction of the electronic device, since the limiting part 500 is located within the limiting groove 211, the height of the side of the limiting part 500 away from the hinge cover 400 is equal to or less than the height of the first surface 210, so that the limiting part 500 will not protrude from the door panel 200. In other words, the limiting part 500 will not push up the flexible display screen, and the entire area of ​​the door panel 200 can support the flexible display screen, thereby not affecting the display effect of the flexible display screen. Optionally, the limiting part 500 and the limiting groove 211 can be configured as an interference fit. Of course, this embodiment does not impose specific limitations on this.

[0043] Optionally, in the width direction of the hinge assembly, the length of the portion of the limiting part 500 that engages with the limiting groove 211 can be 0.3 to 0.8 mm. This ensures the reliability of the limiting without affecting the movement of the door panel 200 when the electronic device switches to a folded state. Of course, this embodiment does not impose specific limitations on this.

[0044] Optionally, the connecting bracket 300 has a surface facing away from the hinge cover 400, which is used to support the flexible display screen, and this surface is not coplanar with the surface of the limiting part 500 facing away from the hinge cover 400. That is, in the thickness direction of the electronic device, the height of the surface of the limiting part 500 facing away from the hinge cover 400 is less than the height of the surface of the connecting bracket 300 facing away from the hinge cover 400.

[0045] In another embodiment, the side of the limiting part 500 facing away from the hinge cover 400 is coplanar with the side of the connecting bracket 300 facing away from the hinge cover 400. That is, in the thickness direction of the electronic device, the height of the side of the limiting part 500 facing away from the hinge cover 400 is equal to the height of the side of the connecting bracket 300 facing away from the hinge cover 400. At this time, the height of the side of the limiting part 500 facing away from the hinge cover 400 is equal to the height of the first surface 210. This allows the door panel 200, the limiting part 500, and the connecting bracket 300 to jointly support the flexible display screen, so as to prevent the flexible display screen from collapsing at the limiting part 500.

[0046] Optionally, the number of limiting parts 500 can be one, that is, only one limiting part 500 is provided on the door panel 200 and / or the connecting bracket 300.

[0047] In another embodiment, the number of limiting parts 500 is at least two, including a first limiting part 510 and a second limiting part 520. The first limiting part 510 and the second limiting part 520 are spaced apart in the direction of the rotation axis of the hinge assembly. When the hinge assembly is in the unfolded state, the door panel 200 and the connecting bracket 300 are limited and engaged by the first limiting part 510 and the second limiting part 520. It can be seen that the limiting part 500 can enhance the limiting ability of the connecting bracket 300 on the door panel 200. That is, the door panel 200 is less likely to deform under the action of the flexible circuit board 710 described later, and thus less likely to cause the flexible display screen to deform.

[0048] Alternatively, the door panel 200 can resist deformation solely through its own rigidity.

[0049] In another embodiment, please refer to Figures 1-3 The hinge assembly also includes a reinforcing member 600, which is disposed on the door panel 200. The reinforcing member 600 increases the structural strength of the door panel 200 to enhance its resistance to deformation. The reinforcing member 600 can be embedded inside the door panel 200 or disposed on the surface of the door panel 200 facing the hinge cover 400 or away from the hinge cover 400. In this case, in order to avoid increasing the overall thickness of the door panel 200, this application can thin the door panel 200 and then provide the reinforcing member 600 on the surface of the door panel 200.

[0050] Optionally, reinforcements 600 may be provided at various points on the door panel 200.

[0051] In another embodiment, a flexible circuit board receiving space 410 is provided between the connecting bracket 300 and the hinge cover 400. This flexible circuit board receiving space 410 is used to accommodate a portion of the flexible circuit board 710, while the other portions of the flexible circuit board 710 are connected to the first housing 720 and the second housing 730, respectively. The reinforcing member 600 is disposed towards the flexible circuit board receiving space 410, that is, the reinforcing member 600 is only disposed in the area of ​​the door panel 200 facing the flexible circuit board 710. This arrangement can reduce the production cost of the door panel 200 and also reduce the weight of the door panel 200, thereby reducing the overall weight of the hinge assembly.

[0052] Optionally, the reinforcing member 600 can be a metal part, which has a greater resistance to deformation, and thus the door panel 200 has a greater resistance to deformation. The surface of the reinforcing member 600 can be a plane.

[0053] In another embodiment, to further improve the rigidity of the reinforcing member 600, a rib 610 is provided on the reinforcing member 600, that is, a reinforcing rib is provided on the reinforcing member 600. The rib 610 can further improve the deformation resistance of the reinforcing member 600, that is, improve the rigidity of the reinforcing member 600, thereby improving the rigidity of the door panel 200, so that the door panel 200 is less likely to deform.

[0054] Optionally, there are at least two door panels 200, including a first door panel 220 and a second door panel 230. Both the first door panel 220 and the second door panel 230 are used to support the flexible display screen. The first door panel 220 and the second door panel 230 are rotatably disposed on opposite sides of the base 100. The hinge assembly can be folded and unfolded through the first door panel 220 and the second door panel 230, thereby realizing the folding and unfolding of the electronic device. There can be one limiting part 500. When the hinge assembly is in the unfolded state, the first door panel 220 and the connecting bracket 300 can be limited and cooperated by the limiting part 500, or the second door panel 230 and the connecting bracket 300 can be limited and cooperated by the limiting part 500.

[0055] In another embodiment, the number of limiting parts 500 is at least two, including a third limiting part 530 and a fourth limiting part 540. When the hinge assembly is in the unfolded state, the first door panel 220 and the connecting bracket 300 are limited and engaged by the third limiting part 530, and the second door panel 230 and the connecting bracket 300 are limited and engaged by the fourth limiting part 540. That is, both the first door panel 220 and the second door panel 230 can be limited by the connecting bracket 300. Therefore, even if the flexible circuit board 710 applies a force to the first door panel 220 and the second door panel 230, the first door panel 220 and the second door panel 230 are not easily deformed. That is, both the first door panel 220 and the second door panel 230 can stably support the flexible display screen.

[0056] Optionally, the number of third limiting portions 530 can be one or at least two, and the number of fourth limiting portions 540 can also be one or at least two. In the direction of the rotation axis of the hinge assembly, the plurality of third limiting portions 530 and the plurality of fourth limiting portions 540 are spaced apart. That is, the first door panel 220 and the connecting bracket 300 are mutually limitingly engaged by the plurality of third limiting portions 530, and the second door panel 230 and the connecting bracket 300 are mutually limitingly engaged by the plurality of fourth limiting portions 540, so that the connecting bracket 300 has a better limiting effect on the first door panel 220 and the second door panel 230. In other words, the third limiting portion 530 here can include the first limiting portion 510 and the second limiting portion 520 mentioned above, and the fourth limiting portion 540 can also include the first limiting portion 510 and the second limiting portion 520 mentioned above.

[0057] Optionally, the door panel 200 is provided with a limiting part 500, and the door panel 200 and the limiting part 500 can be provided separately.

[0058] In another embodiment, the door panel 200 and the limiting part 500 are integrally formed to prevent the connection between the limiting part 500 and the door panel 200 from breaking easily due to excessive force on the limiting part 500 when it is in limiting engagement with the connecting bracket 300.

[0059] And / or, optionally, the connecting bracket 300 is provided with a limiting part 500, and the connecting bracket 300 and the limiting part 500 can be separately provided.

[0060] In another embodiment, the connecting bracket 300 and the limiting part 500 are integrally formed to prevent the connection between the limiting part 500 and the connecting bracket 300 from breaking easily due to excessive force on the limiting part 500 when it is in limiting engagement with the door panel 200.

[0061] Optionally, when both the door panel 200 and the connecting bracket 300 are provided with limiting portions 500, that is, when the number of limiting portions 500 is at least two, a portion of the at least two limiting portions 500 can be provided on the door panel 200, and another portion of the at least two limiting portions 500 can be provided on the connecting bracket 300. The limiting portion 500 on the door panel 200 can engage with the limiting portion 500 on the connecting bracket 300, or the limiting portion 500 on the door panel 200 can engage with the connecting bracket 300, and the limiting portion 500 on the connecting bracket 300 can engage with the door panel 200. Of course, the embodiments of this application do not impose specific limitations on this.

[0062] Optionally, this application also discloses an electronic device, which includes a first housing 720, a second housing 730, and the hinge assembly described above. The first housing 720 and the second housing 730 are rotatably connected by the hinge assembly. During the mutual rotation of the first housing 720 and the second housing 730, the electronic device switches between an unfolded state and a folded state. Specifically, the first door panel 220 described above is disposed on the first housing 720, and the second door panel 230 is disposed on the second housing 730, so that the first housing 720 and the second housing 730 are rotatably disposed on the hinge assembly.

[0063] Optionally, the electronic device further includes a flexible circuit board 710, which is disposed on the first housing 720 and the second housing 730 to provide power to the electronic devices on the first housing 720 and the second housing 730. Simultaneously, the flexible circuit board 710 can be used to enable signal communication between the first housing 720 and the second housing 730. In the thickness direction of the electronic device, there may be no gap between the orthographic projection of the limiting portion 500 and the orthographic projection of the flexible circuit board 710.

[0064] In another embodiment, the door panel 200 is provided with a limiting part 500, and the flexible circuit board 710 is disposed on the side of the door panel facing the hinge cover 400. In this case, during the rotation of the door panel 200, the limiting part 500 rotates with the door panel 200. In order to prevent the limiting part 500 from interfering with other components of the electronic device, that is, to prevent the limiting part 500 from scratching the flexible circuit board 710, there is a gap between the orthographic projection of the limiting part 500 and the orthographic projection of the flexible circuit board 710 in the thickness direction of the electronic device. That is, this gap is a safety gap. This makes it less likely for the limiting part 500 to scratch the flexible circuit board 710 when the limiting part 500 rotates with the door panel 200, and thus will not cause damage to the flexible circuit board 710.

[0065] And / or, the connecting bracket 300 is provided with a limiting part 500. During the folding process of the electronic device, the flexible circuit board 710 will gradually wrap around the connecting bracket 300. In order to prevent the limiting part 500 on the connecting bracket 300 from abutting against the flexible circuit board 710 and causing the flexible circuit board 710 to be torn, the above-mentioned gap must also exist between the orthographic projection of the limiting part 500 and the orthographic projection of the flexible circuit board 710 in the thickness direction of the electronic device, so as to prevent the limiting part 500 on the connecting bracket 300 from damaging the flexible circuit board 710.

[0066] Optionally, the number of limiting parts 500 can be at least two. In this case, the multiple limiting parts 500 are spaced apart in the direction of the rotation axis of the hinge assembly, and the multiple limiting parts 500 are located on both sides of the flexible circuit board 710. That is, in the thickness direction of the electronic device, the orthographic projection of the multiple limiting parts 500 is located on both sides of the orthographic projection of the flexible circuit board 710.

[0067] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A hinge assembly, characterized in that, The hinge assembly includes a base, a door panel, a connecting bracket, and a hinge cover. The hinge cover and the base are connected by the connecting bracket. The door panel is rotatably disposed on the base so that the hinge assembly can switch between an unfolded state and a folded state. There is a flexible circuit board accommodating space between the connecting bracket and the hinge cover. The flexible circuit board accommodating space is used to accommodate the flexible circuit board of the electronic device, and the side of the door panel facing the hinge cover is used to house the flexible circuit board. At least one of the door panel and the connecting bracket is provided with a limiting part. When the hinge assembly is in the unfolded state, the door panel and the connecting bracket are limited by the limiting part to restrict the door panel from moving away from the hinge cover. In the thickness direction of the electronic device, there is a gap between the orthographic projection of the limiting part and the orthographic projection of the flexible circuit board.

2. The hinge assembly according to claim 1, characterized in that, The door panel is provided with the limiting part, and the limiting part protrudes towards the connecting bracket. When the hinge assembly is in the unfolded state, the limiting part and the connecting bracket are in a limiting engagement in the first direction. Wherein, the first direction is the direction in which the hinge cover points to the connecting bracket.

3. The hinge assembly according to claim 2, characterized in that, The side of the limiting part opposite to the hinge cover is recessed relative to the side of the door panel opposite to the hinge cover.

4. The hinge assembly according to claim 1, characterized in that, The connecting bracket is provided with the limiting part, and the limiting part protrudes towards the door panel. The side of the door panel away from the hinge cover is a first surface. A limiting groove is formed on the first surface. When the hinge assembly is in the unfolded state, the limiting part is located in the limiting groove and is limited and engaged with the limiting groove in the first direction. Wherein, the first direction is the direction in which the hinge cover points to the connecting bracket.

5. The hinge assembly according to claim 4, characterized in that, The side of the limiting part that is away from the hinge cover is coplanar with the side of the connecting bracket that is away from the hinge cover.

6. The hinge assembly according to claim 1, characterized in that, The number of limiting parts is at least two, including a first limiting part and a second limiting part. The first limiting part and the second limiting part are spaced apart in the direction of the rotation axis of the hinge assembly. When the hinge assembly is in the unfolded state, the door panel and the connecting bracket are limited and engaged by the first limiting part and the second limiting part.

7. The hinge assembly according to claim 1, characterized in that, The hinge assembly also includes a reinforcement member disposed on the door panel, the reinforcement member facing the flexible circuit board receiving space.

8. The hinge assembly according to claim 7, characterized in that, The reinforcing member is a metal part, and the reinforcing member is provided with raised ribs.

9. The hinge assembly according to claim 1, characterized in that, The number of door panels is at least two, including a first door panel and a second door panel. The first door panel and the second door panel are rotatably disposed on opposite sides of the base. The number of limiting parts is at least two, including a third limiting part and a fourth limiting part. When the hinge assembly is in the unfolded state, the first door panel and the connecting bracket are limited and engaged by the third limiting part, and the second door panel and the connecting bracket are limited and engaged by the fourth limiting part.

10. An electronic device, characterized in that, The device includes a first housing, a second housing, and a hinge assembly according to any one of claims 1-9, wherein the first housing and the second housing are rotatably connected by the hinge assembly, and the electronic device switches between an unfolded state and a folded state during the mutual rotation of the first housing and the second housing.

11. The electronic device according to claim 10, characterized in that, The electronic device also includes a flexible circuit board disposed on the side of the door panel facing the hinge cover. In the thickness direction of the electronic device, there is a gap between the orthographic projection of the limiting portion and the orthographic projection of the flexible circuit board.

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