Hinge mechanism and electronic device
By designing the coordinated movement of the bearing and support components in the hinge mechanism, the problems of reverse folding and creases during the folding process of flexible displays have been solved, resulting in a smoother folding and unfolding process and improving the display's usability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- VIVO MOBILE COMM CO LTD
- Filing Date
- 2022-12-20
- Publication Date
- 2026-05-12
AI Technical Summary
Existing hinge mechanisms are prone to causing reverse folding during the folding process of flexible displays, and as the number of folds increases, the flexible displays develop obvious creases in the bending area.
Design a hinge mechanism in which the bearing drives the support to move away from or closer to the floating plate during different state switching processes, so as to avoid restricting the movement of the floating plate, reserve a smaller or no safety gap to prevent folding, and quickly push the floating plate to support the display screen through the support to reduce creases.
It effectively prevents the flexible display from folding backwards and reduces the appearance of creases, thereby improving the lifespan of the flexible display and the user experience.
Smart Images
Figure CN115929771B_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of electronic product technology, specifically relating to a hinge mechanism and an electronic device. Background Technology
[0002] With the advancement and development of electronic devices, flexible displays have become a development trend. Among these, the hinge mechanism is a key functional component that enables foldable electronic devices. The hinge mechanism may include a virtual swing arm, a floating plate, and a floating plate compression spring. During the folding process, the virtual swing arm rotates, causing the floating plate compression spring, which is under tension, to drive the floating plate to move with the virtual swing arm, thereby realizing the folding and unfolding process of the flexible display.
[0003] However, during the folding process of electronic devices, the virtual swing arm restricts the movement of the floating plate to a certain extent. That is, the virtual swing arm makes the descent speed of the floating plate relatively slow, which affects the normal bending of the screen in the bending area, making it easy for the screen to fold backward. Therefore, in order to avoid the above phenomenon, a certain safety gap needs to be reserved between the floating plate and the flexible display screen in the specific design. Even if the descent speed of the floating plate is relatively slow, the screen in the bending area can first enter the safety gap, and then as the floating plate descends, the screen in the bending area is completely bent, thereby avoiding the screen in the bending area from folding backward.
[0004] However, as the number of folds a flexible display increases, stress is generated in the bending area during bending. After the screen is flattened, this stress deformation is not fully released, and over time, creases appear in the bending area. Furthermore, due to the presence of safety gaps, these creases become more pronounced. Therefore, the hinge mechanism involved in this technology suffers from the problem of noticeable creases on flexible displays. Summary of the Invention
[0005] The purpose of this application is to provide a hinge mechanism and electronic device that can solve the problem that the hinge mechanism involved in the related technology has obvious creases on the flexible display screen.
[0006] This application provides a hinge mechanism for rotatably connecting a first housing and a second housing of an electronic device. The hinge mechanism includes a base, a swing arm, a support member, and a floating plate.
[0007] The first end of the swing arm is connected to the first housing or the second housing, and the second end of the swing arm is provided with a bearing bush, which is slidably engaged with the base.
[0008] The bearing bush is provided with a first sliding groove, the support member slides in the first sliding groove, and the floating plate can be opposite to the flexible display screen.
[0009] During the process of switching the electronic device from an unfolded state to a folded state, the bearing bush drives the support member away from the floating plate, so that the floating plate is away from the flexible display screen; during the process of switching the electronic device from a folded state to an unfolded state, the bearing bush drives the support member to move, so that the support member drives the floating plate closer to the flexible display screen.
[0010] This application provides an electronic device, including the hinge mechanism described above, a first housing, and a second housing, wherein the first housing and the second housing are rotatably connected by the hinge mechanism.
[0011] In this embodiment, when the electronic device switches from an unfolded state to a folded state, the bearing rotates, causing the support to move away from the floating plate. This allows the swing arm and support to not restrict the floating plate's movement away from the flexible display screen, thus preventing the flexible display screen from folding backward. Therefore, in this case, since the swing arm and support do not restrict the floating plate's movement, a smaller safety gap, or even no safety gap, can be provided between the floating plate and the flexible display screen to prevent folding. When the electronic device switches from a folded state to an unfolded state, the bearing rotates, causing the support to move. This allows the support to quickly push the floating plate closer to the flexible display screen to support it. Therefore, in this case, the support allows the floating plate to more reliably support the flexible display screen, reducing creases on the flexible display screen. Thus, this arrangement avoids the problem of noticeable creases on the flexible display screen. Attached Figure Description
[0012] Figure 1 This is a partial structural schematic diagram of the hinge mechanism disclosed in the embodiments of this application;
[0013] Figure 2 for Figure 1 Enlarged view of point A in the middle;
[0014] Figure 3 This is a schematic diagram of the electronic device disclosed in the embodiments of this application in its unfolded state.
[0015] Explanation of reference numerals in the attached figures:
[0016] 110 - First housing, 120 - Second housing;
[0017] 200 - Base;
[0018] 300-swing arm, 310-bearing bush, 311-first slide groove, 3111-first inner surface, 3112-second inner surface, 312-first tooth groove, 320-first swing arm, 330-second swing arm;
[0019] 400 - Support member, 410 - First outer surface, 411 - Second tooth groove, 420 - Second outer surface, 430 - First support member, 440 - Second support member;
[0020] 500-Floating Plate;
[0021] 600-Flexible display screen;
[0022] 700 - First Gear;
[0023] 800 - Second gear;
[0024] 900 - Elastic component. 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 mechanism 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 1-3 This application discloses a hinge mechanism, which includes a base 200, a swing arm 300, a support member 400, and a floating plate 500.
[0029] The hinge mechanism disclosed in this application is applied to an electronic device to rotatably connect a first housing 110 and a second housing 120 of the electronic device. Specifically, the hinge mechanism allows at least a portion of the first housing 110 and at least a portion of the second housing 120 of the electronic device to move closer to or further away from each other, so as to realize the folding or unfolding function of the electronic device.
[0030] The base 200 is the basic component of the hinge mechanism, which can provide a mounting base for other components of the hinge mechanism, such as the swing arm 300, the support 400 and the floating plate 500, and the base 200 can protect the above-mentioned components.
[0031] Specifically, the swing arm 300 is the main component for realizing the folding and unfolding functions of the electronic device. The first end of the swing arm 300 is connected to the first housing 110 or the second housing 120. This arrangement allows the swing arm 300 to move synchronously with the first housing 110 or the second housing 120. That is, when the user folds or unfolds the electronic device, the swing arm 300 can rotate around the rotation axis of the swing arm 300 along with the first housing 110 or the second housing 120 to realize the folding or unfolding of the electronic device.
[0032] The base 200 is used to protect at least a portion of the swing arm 300. Specifically, the second end of the swing arm 300 is provided with a bearing 310, which is slidably engaged with the base 200. That is, the base 200 has a groove in which the bearing 310 is slidably disposed. When the first housing 110 or the second housing 120 rotates relative to the hinge mechanism, the bearing 310 can slide along the groove. At the same time, the base 200 can protect the bearing 310. Optionally, the bearing 310 has an arc-shaped structure, and the groove is an arc-shaped groove.
[0033] Optionally, the base 200 may include a hinge cover and a bracket, which together form the aforementioned groove. That is, the hinge cover and the bracket can jointly protect the bearing 310, and the hinge cover is a peripheral component of the hinge mechanism.
[0034] The bearing bush 310 is provided with a first sliding groove 311, and the support member 400 is slidably engaged with the first sliding groove 311. The floating plate 500 can be opposite to the flexible display screen 600, that is, the floating plate 500 can be used to support the flexible display screen 600, and the support member 400 can be used to support the floating plate 500.
[0035] Specifically, during the process of switching the electronic device from an unfolded state to a folded state, the first housing 110 or the second housing 120 drives the swing arm 300 to rotate, which in turn drives the bearing 310 to slide relative to the base 200. At the same time, the bearing 310 drives the support member 400 away from the floating plate 500, so that the floating plate 500 is away from the flexible display screen 600, so as to avoid the floating plate 500 affecting the folding of the flexible display screen 600. During the process of switching the electronic device from a folded state to an unfolded state, the bearing 310 drives the support member 400 to move, so that the support member 400 drives the floating plate 500 closer to the flexible display screen 600.
[0036] In this embodiment, when the electronic device switches from an unfolded state to a folded state, the bearing 310 rotates, causing the support member 400 to move away from the floating plate 500. This allows the swing arm 300 and the support member 400 to not restrict the floating plate 500 from moving away from the flexible display screen 600, thereby preventing the flexible display screen 600 from folding backward. Therefore, in this case, since the swing arm 300 and the support member 400 do not restrict the movement of the floating plate 500, a smaller safety gap, or even no safety gap, can be reserved between the floating plate 500 and the flexible display screen 600 to prevent the flexible display screen 600 from folding backward. When the electronic device switches from a folded state to an unfolded state, the rotation of the bearing 310 can drive the support member 400 to move, thereby causing the support member 400 to quickly push the floating plate 500 towards the flexible display screen 600 to support the flexible display screen 600. Therefore, in this case, the support member 400 can make the floating plate 500 more reliably support the flexible display screen 600, reducing creases on the flexible display screen 600. Therefore, this configuration can avoid the problem of noticeable creases on the flexible display screen 600.
[0037] Optionally, during the transition of the electronic device from a folded state to an unfolded state, the bearing 310 can use the support member 400 to move the floating plate 500 closer to the flexible display screen 600, and eventually bring the floating plate 500 into contact with the flexible display screen 600. At this time, the floating plate 500 can provide good support for the flexible display screen 600. During the transition of the electronic device from an unfolded state to a folded state, the support member 400 moves away from the floating plate 500 so that the floating plate 500 can move away from the flexible display screen 600 under its own weight. However, this arrangement may result in the electronic device folding too quickly while the floating plate 500 descends too slowly, which makes the floating plate 500 more likely to affect the folding of the electronic device.
[0038] To avoid the aforementioned effects, in another embodiment, the hinge mechanism further includes an elastic element 900. The floating plate 500 is connected to the base 200 via the elastic element 900. Specifically, the floating plate 500 is connected to the hinge cover of the base 200 via the elastic element 900. When the electronic device is in the unfolded state, i.e., under the action of the support member 400, the floating plate 500 contacts the flexible display screen 600 to support the flexible display screen 600. At this time, the elastic element 900 accumulates elastic potential energy. During the process of the electronic device switching from the unfolded state to the folded state, the support member 400 moves away from the floating plate 500, and the elastic element 900 can drive the floating plate 500 away from the flexible display screen 600, i.e., the elastic element 900 releases elastic potential energy to drive the floating plate 500 away from the flexible display screen 600. Thus, during the process of the electronic device switching from the unfolded state to the folded state, the floating plate 500 can move away from the flexible display screen 600 more quickly under the combined action of its own gravity and the elastic element 900, thereby avoiding affecting the folding of the electronic device.
[0039] Optionally, the elastic element 900 can be a component with elastic properties, such as a spring.
[0040] Optionally, the hinge mechanism further includes a first gear 700 and a second gear 800 rotatably disposed on the base 200. Specifically, the first gear 700 and the second gear 800 are rotatably disposed on the support of the base 200. The first gear 700 and the second gear 800 mesh with each other and are both disposed in the first sliding groove 311. The first gear 700 meshes with the tooth groove of the bearing 310, and the second gear 800 meshes with the tooth groove of the support member 400. The number of teeth of the first gear 700 may be less than or equal to the number of teeth of the second gear 800.
[0041] Therefore, it can be seen that the bearing 310 can drive the support 400 to slide in the first groove 311 through the first gear 700 and the second gear 800. However, since the number of teeth of the first gear 700 is less than or equal to the number of teeth of the second gear 800, the movement speed of the support 400 is less than or equal to the movement speed of the bearing 310. That is, the movement speed of the support 400 is relatively small. This may result in the support 400 being unable to drive the floating plate 500 closer to the flexible display screen 600 in time or being more likely to restrict the floating plate 500 from moving away from the flexible display screen 600.
[0042] To avoid the above problems, in another embodiment, the number of teeth of the first gear 700 is greater than the number of teeth of the second gear 800, that is, the movement speed of the support member 400 is greater than the movement speed of the bearing 310. This makes the movement speed of the support member 400 faster, which in turn allows the support member 400 to move the floating plate 500 closer to the flexible display screen 600 or further away from the floating plate 500 more quickly, so as to avoid restricting the floating plate 500 from moving away from the flexible display screen 600.
[0043] Optionally, different electronic devices can use a first gear 700 with a different number of teeth and a second gear 800 with a different number of teeth, and the number of teeth of the first gear 700 is greater than the number of teeth of the second gear 800. This configuration can meet the usage needs of different electronic devices.
[0044] Optionally, the support member 400 and the bearing bush 310 can be arranged sequentially, that is, the first groove 311 is a groove opened on the surface of the bearing bush 310 that slides with the base 200, and the first groove 311 has a bottom surface. The support member 400 has a first outer surface 410 and a second outer surface 420 arranged opposite to each other. At least a part of the bottom surface is arranged opposite to the first outer surface 410. The first gear 700 meshes with the tooth groove on the bottom surface, and the second gear 800 meshes with the second tooth groove 411 of the first outer surface 410. This arrangement enables the support member 400 to slide with the first groove 311 through the first gear 700 and the second gear 800. However, opening a groove on the surface of the bearing bush 310 that slides with the base 200 can easily affect the stability of the sliding engagement between the bearing bush 310 and the base 200.
[0045] To avoid affecting the sliding stability of the bearing 310 relative to the base 200, in another embodiment, the first groove 311 has a first inner surface 3111 and a second inner surface 3112 that are disposed opposite to each other, and the first inner surface 3111, the second inner surface 3112 and the surface of the bearing 310 that slides with the base 200 are disposed sequentially. At least a portion of the first inner surface 3111 is disposed opposite to the first outer surface 410, at least a portion of the second inner surface 3112 is disposed opposite to the second outer surface 420, the first gear 700 meshes with the first tooth groove 312 of the first inner surface 3111, and the second gear 800 meshes with the second tooth groove 411 of the first outer surface 410.
[0046] Therefore, in this embodiment, the first groove 311 is formed inside the bearing bush 310, that is, the first groove 311 is not formed on the surface of the bearing bush 310 that slides with the base 200. This makes the first groove 311 less likely to affect the stability of the sliding fit between the bearing bush 310 and the base 200. At the same time, when the support member 400 slides in the first groove 311, at least a part of the support member 400 can be located in the first groove 311, that is, at least a part of the support member 400 can enter the interior of the bearing bush 310. This allows the bearing bush 310 to protect at least a part of the support member 400.
[0047] Optionally, the support member 400 and the bearing bush 310 can be rotatably connected only by the first gear 700 and the second gear 800. However, to further improve the rotational stability of the support member 400 within the first slide groove 311, in another embodiment, the hinge mechanism further includes a third gear and a fourth gear. Both the third and fourth gears are rotatably mounted on the base 200, meshing with each other and both located within the first slide groove 311. The third gear meshes with the third tooth groove of the second inner surface 3112, and the fourth gear meshes with the fourth tooth groove of the second outer surface 420. The number of teeth on the third gear is greater than the number of teeth on the fourth gear. Thus, the bearing bush 310 drives the support member 400 to slide within the first slide groove 311 via two sets of gears. This results in better sliding stability of the support member 400 within the first slide groove 311, allowing the support member 400 to more stably move the floating plate 500 closer to the flexible display screen 600.
[0048] Furthermore, for ease of manufacturing, the number of teeth of the first gear 700 can be the same as the number of teeth of the third gear, and the number of teeth of the second gear 800 can be the same as the number of teeth of the fourth gear.
[0049] Optionally, the first gear 700 and the second gear 800 have a thickness equal to the length of the first gear 700 and the second gear 800 in the direction of the rotation axis of the support member 400. The support member 400 has a length equal to the length of the support member 400 in the direction of its rotation axis. The thickness of at least one of the first gear 700 and the second gear 800 can be less than the length of the support member 400. That is, the length of the support member 400 is relatively long, and the thickness of at least one of the first gear 700 and the second gear 800 is relatively thin. This results in a smaller contact area between the first gear 700 and the bearing bush 310 and / or a smaller contact area between the second gear 800 and the support member 400. Therefore, this arrangement may result in an unstable connection between the support member 400 and the bearing bush 310, that is, an unstable sliding phenomenon of the support member 400 within the first groove 311.
[0050] To avoid the above phenomenon, in another embodiment, the thickness of at least one of the first gear 700 and the second gear 800 is equal to the length of the support member 400 in the direction of its rotation axis, so as to maximize the contact area between the first gear 700 and the bearing 310 and / or the contact area between the second gear 800 and the support member 400, thereby ensuring the connection stability of the support member 400 and the bearing 310, that is, ensuring the sliding stability of the support member 400 in the first groove 311.
[0051] Optionally, the first gear 700 and the support member 400 may contact each other but not transmit force; for example, the first gear 700 may contact the smooth surface of the support member 400 facing the first gear 700. Similarly, the second gear 800 and the bearing 310 may contact each other but not transmit force; for example, the second gear 800 may contact the smooth surface of the bearing 310 facing the second gear 800. In this case, the first gear 700 and the support member 400, as well as the second gear 800 and the bearing 310, are prone to wear.
[0052] To avoid the aforementioned effects, in another embodiment, please refer to... Figure 1 A first gap exists between the first gear 700 and the support member 400, and a second gap exists between the second gear 800 and the bearing 310. This prevents wear caused by contact between the first gear 700 and the support member 400, and also prevents wear caused by contact between the second gear 800 and the bearing 310. Furthermore, the first and second gaps can be controlled within a small range so that the first gear 700 meshes with the tooth groove on the bearing 310 while being positioned as close as possible to the support member 400, and the second gear 800 meshes with the tooth groove on the support member 400 while being positioned as close as possible to the bearing 310. In the length direction of the electronic device, the orthographic projections of the first gear 700 and the second gear 800 have a significant overlap. This results in a smaller size for the first groove 311 in the thickness direction of the electronic device, and consequently, a smaller size for the first groove 311 on the bearing 310. This avoids affecting the structural strength of the bearing 310.
[0053] Optionally, to further prevent the support member 400 from restricting the movement of the floating plate 500, the arc length of the first groove 311 in the rotation direction of the support member 400 can be greater than the arc length of the support member 400, so that the entire support member 400 can slide into the first groove 311 to avoid restricting the movement of the floating plate 500. However, this will result in the first groove 311 of the bearing 310 being too large, affecting the structural strength of the bearing 310.
[0054] To avoid the aforementioned effects, in another embodiment, the arc length of the first slide groove 311 is equal to the arc length of the support member 400 in the rotation direction of the support member 400, so that the entire support member 400 slides into the first slide groove 311 without wasting the space in the first slide groove 311. Therefore, this embodiment can appropriately reduce the size of the first slide groove 311 to avoid restricting the movement of the floating plate 500 while ensuring the structural strength of the bearing bush 310.
[0055] Optionally, the number of swing arms 300 is at least two, including a first swing arm 320 and a second swing arm 330. The first swing arm 320 is connected to the first housing 110, and the second swing arm 330 is connected to the second housing 120. The first swing arm 320 can rotate around the rotation axis of the first housing 110, and the second swing arm 330 can rotate around the rotation axis of the second housing 120, so as to realize the folding or unfolding of the electronic device. The number of support members 400 can be one, that is, the floating plate 500 is driven to approach the flexible display screen 600 by only one support member 400. This may cause the floating plate 500 to be unstable in supporting the flexible display screen 600.
[0056] To avoid the above phenomenon, in another embodiment, the number of support members 400 is at least two, including a first support member 430 and a second support member 440. The first support member 430 is slidably engaged with the first groove 311 of the first swing arm 320, and the second support member 440 is slidably engaged with the first groove 311 of the second swing arm 330. The first end of the first support member 430 and the first end of the second support member 440 are both connected to the floating plate 500. That is, the floating plate 500 supports the flexible display screen 600 under the action of at least two support members 400. This makes the floating plate 500 more evenly stressed, and thus the floating plate 500 can support the flexible display screen 600 more stably and reliably.
[0057] Optionally, this application also discloses an electronic device, which includes the hinge mechanism, the first housing 110 and the second housing 120 described above. The first housing 110 and the second housing 120 are rotatably connected by the hinge mechanism, that is, the electronic device can realize the folding function and the unfolding function through the hinge mechanism.
[0058] 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 mechanism for rotatably connecting a first housing and a second housing of an electronic device, characterized in that, The hinge mechanism includes a base, a swing arm, a support member, and a floating plate. The first end of the swing arm is connected to the first housing or the second housing, and the second end of the swing arm is provided with a bearing bush, which is slidably engaged with the base. The bearing bush is provided with a first sliding groove, the support member slides in the first sliding groove, and the floating plate can be opposite to the flexible display screen. The hinge mechanism further includes a first gear and a second gear rotatably disposed on the base. The first gear and the second gear mesh with each other and are both disposed in the first groove. The first gear meshes with the tooth groove of the bearing bush, and the second gear meshes with the tooth groove of the support member. The number of teeth of the first gear is greater than the number of teeth of the second gear, so that the movement speed of the support member is greater than the movement speed of the bearing bush. During the process of the electronic device switching from an unfolded state to a folded state, the bearing bush drives the support member away from the floating plate, so that the floating plate is away from the flexible display screen; during the process of the electronic device switching from a folded state to an unfolded state, the bearing bush drives the support member to move, so that the support member drives the floating plate closer to the flexible display screen.
2. The hinge mechanism according to claim 1, characterized in that, The hinge mechanism also includes an elastic element, and the floating plate is connected to the base through the elastic element. When the electronic device is in the unfolded state, the floating plate contacts the flexible display screen. During the process of the electronic device switching from an unfolded state to a folded state, the elastic element can move the floating plate away from the flexible display screen.
3. The hinge mechanism according to claim 1, characterized in that, The first groove has a first inner surface and a second inner surface disposed opposite to each other, and the support member has a first outer surface and a second outer surface disposed opposite to each other. At least a portion of the first inner surface is disposed opposite to the first outer surface, and at least a portion of the second inner surface is disposed opposite to the second outer surface, wherein: The first gear meshes with the first tooth groove on the first inner surface, and the second gear meshes with the second tooth groove on the first outer surface.
4. The hinge mechanism according to claim 3, characterized in that, The hinge mechanism further includes a third gear and a fourth gear, which mesh with each other and are both located in the first groove. The third gear meshes with the third tooth groove on the second inner surface, and the fourth gear meshes with the fourth tooth groove on the second outer surface. The number of teeth on the third gear is greater than the number of teeth on the fourth gear.
5. The hinge mechanism according to claim 1, characterized in that, The thickness of at least one of the first gear and the second gear is equal to the length of the support member in the direction of its rotation axis.
6. The hinge mechanism according to claim 1, characterized in that, The first gear has a first gap with the support member, and the second gear has a second gap with the bearing bush.
7. The hinge mechanism according to claim 1, characterized in that, In the rotational direction of the support member, the arc length of the first groove is equal to the arc length of the support member.
8. The hinge mechanism according to claim 1, characterized in that, The number of swing arms is at least two, including a first swing arm and a second swing arm. The first swing arm is connected to the first housing, and the second swing arm is connected to the second housing. The number of support members is at least two, including a first support member and a second support member. The first support member is slidably engaged with the first groove of the first swing arm, and the second support member is slidably engaged with the first groove of the second swing arm. The first end of the first support member and the first end of the second support member are both connected to the floating plate.
9. An electronic device, characterized in that, It includes the hinge mechanism of any one of claims 1-8, the first housing and the second housing, wherein the first housing and the second housing are rotatably connected by the hinge mechanism.