Housing assembly and electronic device

Abstract

The application provides a shell assembly and an electronic device, and relates to the technical field of electronic products. The shell assembly is used to solve the problem that the assembly structure on the shell of the electronic device affects the structural strength of the shell. The shell assembly comprises a middle frame and a back cover. The back cover comprises a body part, a frame part and a turning part. The frame part is fixed to the surface of the body part and extends along the edge of the body part, the middle frame is arranged on the inner side of the frame part, the frame part has a first surface facing the middle frame, the first surface is provided with a recess, and the turning part is arranged on the first surface. The turning part is located on the side of the recess away from the body part, and the turning part is connected with the middle frame.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic products, and in particular to a shell assembly and an electronic device. BACKGROUND

[0002] As a structural framework of an electronic device, a shell provides a mounting basis for electronic devices and protection, so the structural strength of the shell relates to the reliability of the electronic device. At present, based on the functional requirements or assembly requirements of the electronic device, corresponding assembly structures will be provided on the shell, including aperture structures and groove structures; for example, the bezel of the shell of the current mobile phone, tablet computer and other electronic devices will be provided with side key holes, card holder holes and charging ports and other aperture structures. These assembly structures will affect the structural strength of the shell, and thus may affect the reliability of the electronic device. SUMMARY

[0003] The shell assembly and the electronic device provided by the embodiments of the present application are used to solve the problem that the assembly structure on the shell of the electronic device affects the structural strength of the shell.

[0004] To achieve the above-mentioned purpose, the embodiments of the present application adopt the following technical solutions:

[0005] In a first aspect, a shell assembly is provided, which is applied to an electronic device. The shell assembly comprises a middle frame and a back cover. The back cover comprises a body part, a bezel part and a folded edge part. The bezel part is fixed to the surface of the body part and extends around the edge of the body part. The middle frame is arranged on the inner side of the bezel part. The bezel part has a first surface facing the middle frame. The first surface is provided with a recessed part. The folded edge part is arranged on the first surface. The folded edge part is located on the side of the recessed part away from the body part, and the folded edge part is connected with the middle frame.

[0006] The shell assembly provided by the present application sets the folded edge part at the recessed part on the bezel part to solve the problem of insufficient local structural strength of the bezel part due to the recessed part on the bezel part of the back cover. The folded edge part is equivalent to a reinforcing rib arranged at the recessed part, which reinforces the local area at the recessed part on the bezel part, thereby improving the problem of insufficient local structural strength of the bezel part. In the case of user pressing the key and applying pressure to the bezel part, the folded edge part can reduce the risk of deformation such as collapse of the local area at the recessed part on the bezel part under pressure, thereby effectively ensuring the reliability of the shell assembly and even the electronic device.

[0007] In a possible implementation of the first aspect of the present application, the middle frame is provided with an assembly gap, and the turned-up portion extends into the assembly gap. In this way, based on the turned-up portion being accommodated by the assembly gap, on the one hand, the assembly relationship between the assembly gap and the turned-up portion can be used to realize positioning of the middle frame and the rear cover, and on the other hand, the turned-up portion can be avoided from affecting assembly of the rear cover and the middle frame, so that the frame portion of the rear cover can be attached to the middle frame.

[0008] In a possible implementation of the first aspect of the present application, a surface of the middle frame away from the body portion is a second surface, a surface of the turned-up portion away from the body portion is a third surface, and the display screen of the electronic device is supported on the second surface and the third surface. In this way, for the case that the assembly gap forms a gap region on the second surface due to the thin and light design of the electronic device, the turned-up portion extending into the assembly gap can fill the gap region on the second surface, that is, the surface of the turned-up portion away from the body portion replaces the original second surface at the gap region, and plays a role in supporting the display screen, so that the third surface of the turned-up portion and the second surface of the middle frame jointly support the display screen, and on the basis of adapting to the thin and light electronic device, the reliability of assembly of the display screen can be ensured.

[0009] In a possible implementation of the first aspect of the present application, the shell assembly further includes an adhesive layer, the adhesive layer covers at least part of the third surface and at least part of the second surface, and the display screen is fixedly connected to the middle frame through the adhesive layer. In this way, by providing the adhesive layer, the height difference between the third surface and the second surface can be compensated while connecting the display screen, so as to ensure flatness and reliability of assembly of the display screen.

[0010] In a possible implementation of the first aspect of the present application, the adhesive layer includes a first adhesive layer and a second adhesive layer, the first adhesive layer is arranged on the second surface, and the second adhesive layer is arranged on the third surface, and an end portion of the second adhesive layer abuts against an end portion of the first adhesive layer. In this way, dividing the adhesive layer into two parts can adapt to the actual assembly process and improve the flexibility of assembly.

[0011] In a possible implementation of the first aspect of the present application, the first adhesive layer includes a first region and a second region, the second region is arranged at an end portion of the first region, the second adhesive layer includes a third region and a fourth region, and the fourth region is arranged at an end portion of the third region; an end portion of the second region away from the first region abuts against the third region, and an end portion of the fourth region away from the third region abuts against the first region, and the second region and the fourth region are distributed and abut against each other in a direction perpendicular to the first surface. In this way, the joint structure at the abutment position of the first adhesive layer and the second adhesive layer forms a zigzag-shaped second joint, and compared with a linear second joint, the zigzag-shaped second joint has a longer extension path, so that the flow path of liquid can be lengthened, the possibility of liquid entering the inside of the electronic device can be reduced, and the risk of failure of the electronic device due to liquid ingress can be reduced.

[0012] In a possible implementation of the first aspect of the present application, the end of the first adhesive layer covers a partial area of the third surface, or the end of the second adhesive layer covers a partial area of the second surface. In this way, the first adhesive layer or the second adhesive layer can cover the first joint between the middle frame and the folded edge, compensate for the height difference that may exist between the third surface and the second surface, and improve the liquid-proof capability at the first joint.

[0013] In a possible implementation of the first aspect of the present application, the assembly gap penetrates through both side surfaces of the middle frame in the thickness direction of the electronic device. In this way, when the middle frame and the rear cover are assembled, the folded edge can enter the assembly gap through the gap area formed on the surface of the middle frame, thereby avoiding the middle frame and avoiding interference with the middle frame.

[0014] In a possible implementation of the first aspect of the present application, the recessed portion forms an assembly hole through the outer surface of the frame portion, and the housing assembly further includes a key, the key is arranged in the assembly hole, and an end of the key inside the housing assembly extends into the assembly gap. In this way, the assembly gap is used for assembling the folded edge and the key at the same time, which can simplify the assembly structure of the middle frame.

[0015] In a possible implementation of the first aspect of the present application, the assembly hole is provided with a connecting portion, and two ends of the connecting portion are connected with two side walls in the assembly hole, which are distributed in the thickness direction of the electronic device. In this way, the connecting portion can support the crossbeam formed on the frame portion due to the assembly hole, and the pressure acting on the crossbeam can be transmitted to the main body portion through the connecting portion, which is equivalent to using the main body portion to bear part of the pressure acting on the crossbeam, thereby reducing the risk of deformation of the crossbeam under the pressure.

[0016] In a possible implementation of the first aspect of the present application, a relief groove is formed on the surface of the key facing the inside of the housing assembly, and the projection of the connecting portion on the surface of the key is located in the relief groove. In this way, by setting the relief groove on the key, the pressing stroke of the key can be extended on the basis of retaining the connecting portion, so that the user can obviously feel that the key is pressed down, thereby making the user's pressing operation obtain obvious tactile feedback and improving the user's experience.

[0017] In a possible implementation of the first aspect of the present application, the recessed portion and the folded edge both extend along the extension direction of the frame portion. In this way, the recessed portion is arranged as an extended strip-shaped structure, which can meet the corresponding assembly requirements, and the folded edge is also arranged as an extended strip-shaped structure, which can strengthen the structural strength of each local position for the strip-shaped recessed portion.

[0018] In a possible implementation of the first aspect of the present application, the fourth surface is away from the surface of the body part, and at least part of the edge-turning part is located between the surface where the fourth surface is located and the recessed part in the thickness direction of the electronic device. In this way, at least part of the edge-turning part is located between the recessed part and the fourth surface, so that the edge-turning part can effectively strengthen the structural strength of the area between the recessed part and the fourth surface.

[0019] In a possible implementation of the first aspect of the present application, the length of the edge-turning part is greater than or equal to the length of the recessed part in the extension direction of the frame part.

[0020] In a second aspect, an electronic device is provided, which includes the shell assembly described above. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A structural diagram of an electronic device provided by an embodiment of the present application is shown in the figure;

[0022] Figure 2 An exploded view of an electronic device provided by an embodiment of the present application is shown in the figure;

[0023] Figure 3 A structural diagram of a recessed part provided by an embodiment of the present application is shown in the figure;

[0024] Figure 4 Another structural diagram of a recessed part provided by an embodiment of the present application is shown in the figure;

[0025] Figure 5 A Figure 2 A local enlarged view of the recessed part is shown in the figure;

[0026] Figure 6 A local diagram of a rear cover with an edge-turning part provided by an embodiment of the present application is shown in the figure;

[0027] Figure 7 An assembly diagram of the rear cover and the middle frame is shown in the figure;

[0028] Figure 8 A local diagram of the assembly hole and the edge-turning part in the front view is shown in the figure;

[0029] Figure 9 A local diagram of the assembly hole and the edge-turning part in the top view is shown in the figure;

[0030] Figure 10 Another local diagram of the assembly hole and the edge-turning part in the front view is shown in the figure;

[0031] Figure 11 Another local diagram of the assembly hole and the edge-turning part in the top view is shown in the figure;

[0032] Figure 12Another partial view of the assembly hole and the flange portion in the front view;

[0033] Figure 13 Another partial view of the assembly hole and the flange portion in the front view;

[0034] Figure 14 Another partial view of the assembly hole and the flange portion in the front view;

[0035] Figure 15 Another partial view of the assembly hole and the flange portion in the front view;

[0036] Figure 16 Another partial view of the assembly hole and the flange portion in the front view;

[0037] Figure 17 Another partial view of the assembly hole and the flange portion in the front view;

[0038] Figure 18 Another partial view of the assembly hole and the flange portion in the front view;

[0039] Figure 19 Another partial view of the assembly hole and the flange portion in the front view;

[0040] Figure 20 Another partial view of the assembly hole and the flange portion in the front view;

[0041] Figure 21 Another partial view of the assembly hole and the flange portion in the front view; Figure 20 Another partial view of the assembly hole and the flange portion in the front view;

[0042] Figure 22 Another partial view of the assembly hole and the flange portion in the front view;

[0043] Figure 23 Another partial view of the assembly hole and the flange portion in the front view; Figure 22 Another partial view of the assembly hole and the flange portion in the front view;

[0044] Figure 24 Another partial view of the assembly hole and the flange portion in the front view;

[0045] Figure 25 Another partial view of the assembly hole and the flange portion in the front view;

[0046] Figure 26 Another partial view of the assembly hole and the flange portion in the front view;

[0047] Figure 27 Another partial view of the assembly hole and the flange portion in the front view;

[0048] Figure 28 Another partial view of the assembly hole and the flange portion in the front view;

[0049] Reference signs:

[0050] 100 - electronic device

[0051] 10 - back cover, 11 - body part, 12 - frame part, 12a - first surface, 12b - fourth surface, 120 - recessed part, 121 - fitting hole, 1211 - connecting part, 122 - crossbeam, 13 - flange part, 13a - third surface

[0052] 20 - middle frame, 20a - second surface, 21 - fitting gap, 22 - support part, 23 - accommodating groove

[0053] 30 - display screen

[0054] 40 - key, 41 - avoiding groove, 42 - fitting part, 43 - pressing piece

[0055] 50 - first seam

[0056] 60 - reset member

[0057] 70 - circuit board, 71 - pressing contact

[0058] 80 - adhesive layer, 81 - first adhesive layer, 811 - first area, 812 - second area, 82 - second adhesive layer, 821 - third area, 822 - fourth area

[0059] 90 - second seam DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0061] Hereinafter, the terms "first", "second", and the like are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", and the like can explicitly or implicitly include one or more of the features.

[0062] In addition, in the present application, the orientation terms such as "up", "down", and the like are defined with respect to the orientation of the components shown in the drawings. It should be understood that these directional terms are relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the orientation of the components placed in the drawings.

[0063] In the present application, unless specifically defined and limited otherwise, the term "connected" shall be construed as a broad sense, for example, "connected" can be fixed connection, or detachable connection, or integral; can be directly connected, or indirectly connected through intermediate media.

[0064] An electronic device 100 is provided in the present application. Specifically, the electronic device 100 can be a portable electronic device or other types of electronic devices. For example, the electronic device 100 can be a mobile phone, a tablet personal computer, a laptop computer, a personal digital assistant (PDA), a monitor, a camera, a personal computer, a notebook computer, a wearable device, etc. For the convenience of description, the electronic device 100 is taken as a tablet personal computer as an example in the following.

[0065] Please refer to Figure 1 and Figure 2 , Figure 1 The structural diagram of the electronic device 100 provided in the present application is shown in Figure 2 The exploded view of the electronic device 100 provided in the present application is shown in. As can be seen from the above, in the present embodiment, the electronic device 100 is a tablet personal computer, and the electronic device 100 can have an approximately rectangular plate structure. The electronic device 100 can include a back cover 10, a middle frame 20 and a display screen 30.

[0066] For the convenience of the following description, an XYZ coordinate system is established, and the width direction of the electronic device 100 is defined as the X-axis direction, the length direction of the electronic device 100 is defined as the Y-axis direction, and the thickness direction of the electronic device 100 is defined as the Z-axis direction. It can be understood that the coordinate system of the electronic device 100 can be flexibly set according to actual needs, and the present application only gives an example, and cannot be considered as a special limitation to the present application. Figure 1 and Figure 2 Only some components included in the electronic device 100 are schematically shown, and the actual shape, actual size, actual position and actual structure of these components are not limited by Figure 1 and Figure 2 .

[0067] The rear cover 10 wraps the outside of the middle frame 20, so that the rear cover 10 and the middle frame 20 jointly constitute a shell assembly of the electronic device 100. The rear cover 10 and the middle frame 20 can be fixedly connected by bonding, threaded connection, welding, clamping, etc. Exemplarily, the middle frame 20 can be made of plastic material, and the rear cover 10 can be made of metal material (including single metal material and alloy material). The middle frame 20 made of plastic material can reduce the weight of the shell assembly, and the rear cover 10 made of metal material can improve the appearance of the shell assembly. In this way, the shell assembly constituted by the rear cover 10 and the middle frame 20 can make the electronic device 100 have the advantages of light weight and good appearance at the same time.

[0068] The display screen 30 is used to display images, videos, etc. The display screen 30 is fixed on the shell assembly constituted by the rear cover 10 and the middle frame 20, so that the display screen 30 and the shell assembly jointly enclose a containing cavity inside the electronic device 100, which is used to arrange corresponding functional components (such as a mainboard, a battery, etc.) of the electronic device 100 and provide protection for the corresponding functional components. Exemplarily, the mainboard of the electronic device 100 is arranged in the containing cavity and fixed on the middle frame 20.

[0069] In addition, on the one hand, the display screen 30 can be a touch screen or a non-touch screen; on the other hand, the display screen 30 can be a flexible display screen or a rigid display screen. For example, the display screen 30 can be an organic light-emitting diode (OLED) display screen, an active-matrix organic light-emitting diode (AMOLED) display screen, a mini light-emitting diode display screen, a micro light-emitting diode display screen, a micro organic light-emitting diode display screen, a quantum dot light emitting diode (QLED) display screen, or a liquid crystal display (LCD).

[0070] Further, please continue to refer to Figure 1 and Figure 2The back cover 10 comprises a body part 11 and a frame part 12, the frame part 12 is arranged on the surface of the body part 11 and extends along the edge of the body part 11, that is, the frame part 12 has a ring structure. Thus, the body part 11 and the frame part 12 jointly form an installation space, and the middle frame 20 is assembled in the installation space, that is, the middle frame 20 is arranged on the inner side of the frame part 12. Exemplarily, the middle frame 20 can be attached to the first surface 12a of the frame part 12 (that is, the inner side surface of the frame part 12) facing the middle frame 20, so as to be connected to each other by adhesion.

[0071] In addition, please continue to refer to Figure 2 and further refer to Figure 3 and Figure 4 , Figure 3 is a structure schematic view of a recess 120 provided by an embodiment of the present application, Figure 4 is a structure schematic view of another recess 120 provided by an embodiment of the present application. The recess 120 is arranged on the first surface 12a and is used to provide an assembly space for a functional component of the electronic device 100. The recess 120 can be a hole structure (penetrating the frame part 12) or a groove structure (not penetrating the frame part 12).

[0072] Exemplarily, the recess 120 can be a through hole penetrating the frame part 12, which can be used to assemble a functional component such as a key 40 (for example, a power key, a volume key, etc.) or a card holder (for example, a phone card holder, a storage card holder, etc.), or the through hole can be used as a functional interface such as a charging interface or a data transmission interface. The recess 120 can also be a groove for accommodating a corresponding functional component (for example, an antenna) or as a relief structure of the frame part 12 to avoid interference between the frame part 12 and the functional component.

[0073] Based on this, the recess 120 arranged on the first surface 12a is equivalent to removing part of the material of the frame part 12 on the first surface 12a, which will affect the local structural strength of the frame part 12 at the recess 120, causing the frame part 12 to easily deform locally at the recess 120, thereby easily affecting the reliability of the shell assembly and even the electronic device 100. Hereinafter, the recess 120 is taken as an example of a through hole for assembling a key 40.

[0074] Specifically, please refer to Figure 5 , Figure 5 is Figure 2A local enlarged view of the concave portion 120. A through hole (hereinafter referred to as the assembly hole 121) is provided in the concave portion 120 for assembling the key 40. During use of the electronic device 100, the key 40 is frequently pressed by the user, and the user also exerts pressure on the local portion of the frame portion 12 corresponding to the assembly hole 121 when pressing the key 40. Therefore, the structural strength of the frame portion 12 at the assembly hole 121 is weakened due to the presence of the assembly hole 121. In particular, the structural strength of the local area of the frame portion 12 on the side of the assembly hole 121 away from the body portion 11 is most obviously affected by the assembly hole 121. The local area forms a structure with a certain span and similar to a beam (hereinafter referred to as the beam 122) due to the presence of the assembly hole 121, and the structural strength of the beam 122 is relatively low compared to other areas of the frame portion 12. Therefore, the beam 122 is prone to deformation such as collapse under pressure.

[0075] To solve the above problems, in some embodiments, the middle frame 20 can be used to strengthen the local structural strength of the frame portion 12 at the assembly hole 121. For example, based on the adhesive connection between the back cover 10 and the middle frame 20, the area around the assembly hole 121 on the first surface 12a of the frame portion 12 can be further bonded with the surface of the middle frame 20, so that the frame portion 12 and the middle frame 20 are integrated, thereby strengthening the structural strength of the frame portion 12 at the assembly hole 121 through the middle frame 20, reducing the risk of deformation of the frame portion 12 at the assembly hole 121, and ensuring the reliability of the shell assembly and the electronic device 100.

[0076] However, based on the current trend of thin and light design of electronic devices 100, the thickness of the electronic device 100 is very thin, and therefore the width of the frame portion 12 in the thickness direction (i.e., the Z-axis direction) of the electronic device 100 is also very limited. In this case, after the assembly hole 121 is formed on the first surface 12a of the frame portion 12, the local area of the first surface 12a on the side of the assembly hole 121 away from the body portion 11 (i.e., the area where the beam 122 is located) has a more limited width in the Z-axis direction, making it difficult to implement the bonding process.

[0077] At the same time, in order to ensure the operation experience of the user pressing the key 40, the width of the key 40 in the Z-axis direction is designed to be as wide as possible, which requires the width of the assembly hole 121 in the Z-axis direction to be as wide as possible, thereby occupying most of the space of the frame portion 12 in the Z-axis direction. At this time, even if the width of the frame portion 12 in the Z-axis direction is relatively wide (i.e., the thickness of the electronic device 100 is relatively thick), after the assembly hole 121 is formed, the local area of the first surface 12a on the side of the assembly hole 121 away from the body portion 11 has a very limited width in the Z-axis direction, making it difficult to implement the bonding process.

[0078] In other scenarios, if the rear cover 10 and the middle frame 20 are connected by means other than adhesion, there may also be a problem that the local structural strength at the assembly hole 121 cannot be effectively strengthened, i.e., the middle frame 20 cannot effectively strengthen the local structural strength of the bezel portion 12 at the assembly hole 121.

[0079] Taking the case where the rear cover 10 and the middle frame 20 are connected by the aforementioned threaded connecting pieces (e.g., screws) as an example, the connection mode of the rear cover 10 and the middle frame 20 is multi-point connection, i.e., a plurality of threaded connecting pieces are distributed at different positions between the rear cover 10 and the middle frame 20. In this case, there may be no threaded connecting piece distributed on the first surface 12a of the bezel portion 12 near the assembly hole 121, and in fact, due to the existence of the assembly hole 121, the space of the bezel portion 12 near the assembly hole 121 is very limited, and a threaded connecting piece is usually not provided. This will result in that although the rear cover 10 and the middle frame 20 are connected as a whole by the threaded connecting pieces, the local area of the bezel portion 12 where the assembly hole 121 is located is not connected with the middle frame 20, so the structural strength of the local area cannot be strengthened by the middle frame 20.

[0080] Therefore, in order to overcome the defects of the above solutions, the embodiments of the present application provide a shell assembly applied to the electronic device 100 described above, please refer to Figure 6 With Figure 7 , Figure 6 a partial view of a rear cover 10 with a turned-up portion 13 provided by the embodiments of the present application, Figure 7 an assembly view of the rear cover 10 and the middle frame 20. The first surface 12a of the bezel portion 12 is provided with an assembly hole 121 and a turned-up portion 13, the turned-up portion 13 is located on the side of the assembly hole 121 away from the body portion 11, i.e., the turned-up portion 13 and the assembly hole 121 are distributed on the first surface 12a along the Z-axis direction, and the turned-up portion 13 is connected with the middle frame 20.

[0081] Since the turned-up portion 13 is located on the side of the assembly hole 121 away from the body portion 11, i.e., the turned-up portion 13 is located at the aforementioned cross beam 122, so the turned-up portion 13 is equivalent to a reinforcing rib provided on the cross beam 122, which thickens the cross beam 122. In this way, based on the cross beam 122 being the position where the pressure applied by the user pressing the key 40 on the bezel portion 12, after thickening the cross beam 122 by the turned-up portion 13, the structural strength of the cross beam 122 can be effectively improved, the risk of deformation such as collapse of the cross beam 122 under pressure can be reduced, thereby the reliability of the shell assembly and even the electronic device 100 can be effectively guaranteed.

[0082] It can be understood that the above describes the effect of the reinforcing portion 13 on the structural strength of the frame portion 12 of the back cover 10 by taking the recessed portion 120 as an example of the assembly hole 121 for assembling the key 40. When the recessed portion 120 is configured as an orifice structure for assembling other functional components or as a groove structure, the corresponding technical effects are also achieved, which will not be described here.

[0083] In addition, the following content related to the recessed portion 120 is described by taking the recessed portion 120 as an example of the assembly hole 121. That is, when the following content related to the recessed portion 120 is described, the assembly hole 121 is referred to. When the recessed portion 120 is configured as other orifice structures or groove structures, the related content can be referred to the example of the recessed portion 120 configured as the assembly hole 121.

[0084] In some examples, please refer to Figure 8 and Figure 9 , Figure 8 FIG. 13 is a partial schematic view of the assembly hole 121 and the reinforcing portion 13 from a front view perspective, Figure 9 FIG. 14 is a partial schematic view of the assembly hole 121 and the reinforcing portion 13 from a top view perspective. The assembly hole 121 is configured to extend along the extension direction of the frame portion 12. Here, the assembly hole 121 extends along the Y-axis direction, that is, the assembly hole 121 is configured as a strip-shaped hole to meet the corresponding assembly requirements. Correspondingly, the reinforcing portion 13 is also configured as a strip-shaped structure extending along the Y-axis direction to strengthen the structural strength of the strip-shaped cross beam 122 formed by the strip-shaped assembly hole 121.

[0085] In addition, in order to ensure that the reinforcing portion 13 can effectively strengthen the structural strength of the cross beam 122, at least a part of the reinforcing portion 13 is located on the cross beam 122. Specifically, taking the surface of the frame portion 12 away from the body portion 11 as a reference, that is, the fourth surface 12b, in the Z-axis direction, at least a part of the reinforcing portion 13 is located between the surface where the fourth surface 12b is located and the assembly hole 121, that is, it can be ensured that at least a part of the reinforcing portion 13 is located on the cross beam 122.

[0086] In addition, in order to further improve the strengthening effect on the structural strength of the cross beam 122, the length of the reinforcing portion 13 extending along the Y-axis direction is greater than or equal to the length of the assembly hole 121, that is, greater than or equal to the length of the cross beam 122. Based on this, the positional relationship between the reinforcing portion 13 and the assembly hole 121 can include several different cases, so that the reinforcing portion 13 can strengthen the structural strength of the cross beam 122 from multiple aspects.

[0087] Specifically, the first case corresponds to Figure 8 and Figure 9In the structure shown, the length of the flange portion 13 extending along the Y-axis direction is equal to the length of the assembly hole 121, that is, the length of the flange portion 13 is the same as the length of the cross beam 122, and in this case, the entire flange portion 13 is located between the surface on which the fourth surface 12b is located and the assembly hole 121, that is, the entire flange portion 13 is located on the cross beam 122. In this way, the structure strength of each position of the cross beam 122 as a whole can be enhanced by the thickening of the flange portion 13.

[0088] In the second case, referring to Figure 10 and Figure 11 , Figure 10 is another partial view of the assembly hole 121 and the flange portion 13 from the front view angle, Figure 11 is another partial view of the assembly hole 121 and the flange portion 13 from the top view angle. In this case, a part of the flange portion 13 is located between the surface on which the fourth surface 12b is located and the assembly hole 121, and a part of the flange portion 13 is located outside the region between the surface on which the fourth surface 12b is located and the assembly hole 121, that is, a part of the flange portion 13 is located on the cross beam 122 and a part of the flange portion 13 is located outside the cross beam 122. In this way, the flange portion 13 not only thickens the cross beam 122 to enhance the structure strength of the cross beam 122, but also enhances the structure strength of the part where the cross beam 122 is connected to other regions of the frame portion 12, thereby enhancing the structure strength of the cross beam 122 and the regions near the cross beam 122 as a whole.

[0089] In this case, the length of the flange portion 13 along the Y-axis direction can be greater than or equal to the length of the assembly hole 121, that is, the length of the flange portion 13 can be greater than or equal to the length of the cross beam 122. In this case, the length of the part of the flange portion 13 located on the cross beam 122 can be the same as the length of the cross beam 122, or can be less than the length of the cross beam 122. Of course, in the case where a part of the flange portion 13 is located on the cross beam 122 and a part of the flange portion 13 is located outside the cross beam 122, the length of the flange portion 13 can also be less than the length of the cross beam 122, that is, the length of the flange portion 13 can be less than the length of the assembly hole 121.

[0090] Exemplarily, referring to Figure 12 and Figure 13 , Figure 12 is still another partial view of the assembly hole 121 and the flange portion 13 from the front view angle, Figure 13Another partial view of the back cover 10 provided by the embodiments of the present application is shown in FIG. 6, which is a partial view of the back cover 10 provided by the embodiments of the present application, and shows the assembly hole 121 and the flange portion 13 from a top view. In this view, the length of the flange portion 13 along the Y-axis is greater than the length of the assembly hole 121, i.e., the length of the flange portion 13 is greater than the length of the crossbeam 122, and the middle of the flange portion 13 is located on the crossbeam 122, and the two ends are located outside the crossbeam 122. In this case, the length of the portion of the flange portion 13 located on the crossbeam 122 is the same as the length of the crossbeam 122. In this way, the flange portion 13 can not only strengthen the structural strength of the crossbeam 122 at various positions, but also strengthen the structural strength of the portions of the crossbeam 122 at the two ends connected to other areas of the frame portion 12, so as to further expand the range of the areas with strengthened structural strength, and improve the overall structural strength of the frame portion 12 in the area near the assembly hole 121.

[0091] In some embodiments, for the crossbeam 122 formed by the frame portion 12 at the assembly hole 121, in order to reduce the risk of deformation under pressure, in addition to the structural strength of the crossbeam 122 being strengthened by the flange portion 13 described above, other means can also be combined to further reduce the risk of deformation of the crossbeam 122.

[0092] Specifically, referring to FIG. 7, Figure 14 and FIG. 8, Figure 15 , Figure 14 is another partial view of the back cover 10 provided by the embodiments of the present application, which is a partial view of the back cover 10 provided by the embodiments of the present application, and shows the assembly hole 121 and the flange portion 13 from a top view, Figure 15 is a cross-sectional view of the back cover 10 at the flange portion 13. In this view, the assembly hole 121 on the frame portion 12 of the back cover 10 is provided with a connecting portion 1211, and the two ends of the connecting portion 1211 are connected to the two side hole walls of the assembly hole 121 along the Z-axis, i.e., one end of the connecting portion 1211 is connected to the crossbeam 122, and the other end is indirectly connected to the body portion 11 of the back cover 10.

[0093] In this way, the connecting portion 1211 actually plays a supporting role for the crossbeam 122, and the pressure acting on the crossbeam 122 can be transmitted to the body portion through the connecting portion 1211, which is equivalent to using the body portion to bear part of the pressure acting on the crossbeam 122, so as to reduce the risk of deformation of the crossbeam 122 under pressure from the perspective of force.

[0094] Therefore, by combining the strengthening of the structural strength of the crossbeam 122 by the flange portion 13 described above and the supporting of the crossbeam 122 by the connecting portion 1211, the risk of deformation of the crossbeam 122 under pressure is reduced from the perspectives of structural strength and force, so as to minimize the risk.

[0095] In some examples, referring to FIG. 9, Figure 14 and FIG. 10, Figure 15, the connection part 1211 is arranged in the assembling hole 121, in order to avoid the connection part 1211 affecting the normal pressing of the key 40, that is, to avoid the connection part 1211 excessively affecting the pressing stroke of the key 40, the thickness of the connection part 1211 in the X-axis direction is less than the width of the assembling hole 121, and the connection part 1211 is spaced from the outer side surface of the frame part 12 (that is, the surface away from the first surface 12a) in the X-axis direction. In this way, a spacing space is formed between the connection part 1211 and the outer surface of the frame part 12, which can provide a pressing movement space for the key 40.

[0096] In addition, the connection part 1211 is flush with the inner side surface of the frame part 12 (that is, the first surface 12a), that is, the surface of the connection part 1211 is coplanar with the first surface 12a, so that the connection part 1211 does not protrude from the first surface 12a, avoiding interference with other components inside the frame part 12.

[0097] Further, the key 40 is provided with a relief groove 41 for cooperating with the connection part 1211, the relief groove 41 is located on the surface of the key 40 facing the inside of the shell assembly (that is, the inside of the electronic device 100), and the projection of the connection part 1211 on the surface of the key 40 is located in the relief groove 41, that is, the relief groove 41 can accommodate the connection part 1211, thereby reducing or even eliminating the influence of the connection part 1211 on the pressing stroke of the key 40, and improving the operation experience of the user when pressing the key 40.

[0098] Specifically, when the key 40 is not provided with the relief groove 41, the pressing stroke of the key 40 is the distance between the surface of the key 40 facing the connection part 1211 and the surface of the connection part 1211 in the X-axis direction, that is, when the key 40 is pressed, it moves along the assembling hole 121 to abut against the surface of the connection part 1211, that is, reaches the end of the stroke. If there is no connection part 1211 in the assembling hole 121, the key 40 can obviously move further, so as mentioned above, the setting of the connection part 1211 will shorten the pressing stroke of the key 40. If the pressing stroke is too short, from the user's point of view, it means that the user has not felt that the key 40 has been pressed obviously, but has triggered the corresponding control instruction through the key 40, resulting in that the triggering time of the control instruction does not match the user's expected time, and the user's pressing operation does not get obvious tactile feedback, ultimately leading to poor user experience.

[0099] Therefore, by arranging the avoiding groove 41 on the key 40, the pressing stroke of the key 40 can be prolonged on the basis of reserving the connecting part 1211, that is, when the connecting part 1211 is relatively moved into the avoiding groove 41 and abuts against the bottom wall of the avoiding groove 41, the end point of the pressing stroke is reached. Based on this, the process of the key 40 being pressed can be relatively prolonged, so that the user can obviously feel that the key 40 is pressed down, thereby making the user's pressing operation can obviously get the hand feeling feedback, improving the user's experience.

[0100] In addition, in other examples, please continue to refer to Figure 15 , the flange part 13 is spaced apart from the assembly hole 121 in the Z-axis direction, that is, based on the orientation shown in Figure 15 , the height at which the lower surface (that is, the surface facing the body part 11) of the flange part 13 is located is higher than the upper hole of the assembly hole 121. The purpose of such design is to make the lower surface of the flange part 13 not in contact with the key 40 in the assembly hole 121, so as to avoid the key 40 being pressed to be subjected to the frictional resistance of the flange part 13, thereby avoiding the pressing resistance of the key 40 being too large to affect the user's pressing operation.

[0101] In some embodiments, for the connection relationship between the aforementioned flange part 13 and the middle frame 20, please refer to Figure 16 and Figure 17 , Figure 16 is a partial assembly drawing of the rear cover 10 and the middle frame 20, Figure 17 is a partial schematic view of the rear cover 10 and the middle frame 20 at the flange part 13 from a top view. The middle frame 20 is provided with an assembly gap 21, and when the rear cover 10 and the middle frame 20 are assembled, the flange part 13 extends into the assembly gap 21, and the part of the flange part 13 extending into the assembly gap 21 can also abut against the wall surface of the assembly gap 21. In this way, based on accommodating the flange part 13 by using the assembly gap 21, on the one hand, the positioning of the middle frame 20 and the rear cover 10 can be realized by using the assembly relationship between the assembly gap 21 and the flange part 13, and on the other hand, the flange part 13 can be avoided to affect the assembly of the rear cover 10 and the middle frame 20.

[0102] Specifically, for the assembly of the rear cover 10 and the middle frame 20, after accommodating the flange part 13 by using the assembly gap 21, the flange part 13 will not abut against the surface of the middle frame 20 facing the bezel part 12, so that the surface of the middle frame 20 facing the bezel part 12 can be attached to the first surface 12a of the bezel part 12. Then, the middle frame 20 and the bezel part 12 can be directly connected and assembled by adhesion, without being affected by the flange part 13.

[0103] In some examples, please continue to refer to Figure 16 and Figure 17The two ends of the portion of the flange portion 13 extending into the assembly gap 21 abut against the side walls on both sides of the assembly gap 21, wherein the abutment of the ends of the flange portion 13 against the side walls of the assembly gap 21 is treated for liquid ingress prevention.

[0104] Specifically, the length of the flange portion 13 in the Y-axis direction gradually decreases in the direction in which the flange portion 13 protrudes from the first surface 12a, i.e., in the direction perpendicular to the first surface 12a and pointing towards the middle frame 20 (i.e., in the direction of the X-axis and pointing towards the middle frame 20). Also, the width of the portion of the assembly gap 21 accommodating the flange portion 13 in the Y-axis direction gradually decreases in the direction of the X-axis and pointing towards the middle frame 20. At this time, the abutment of the ends of the flange portion 13 against the side walls of the assembly gap 21 forms a first seam 50, and the extension path of the first seam 50 is in a meandering shape, such as the curved first seam 50 shown in Figure 17

[0105] In this way, compared with the linear first seam 50, the curved first seam 50 has a longer extension path, and when external liquid (such as rainwater) flows from the assembly hole 121 into the inside of the electronic device 100, the liquid can flow through the first seam 50. Since the curved first seam 50 has a longer path, the flow path of the liquid can be lengthened, and the possibility of the liquid eventually entering the inside of the electronic device 100 is reduced, thereby reducing the risk of failure of the electronic device 100 due to liquid ingress.

[0106] In other examples, please continue to refer to Figure 16 and Figure 17 The assembly gap 21 can also be used to assemble the key 40 at the same time. The main body of the key 40 is accommodated in the assembly hole 121, and in the direction of the X-axis, one end of the key 40 is located outside the bezel portion 12 for user pressing, and the other end of the key 40 is located inside the bezel portion 12 and extends into the assembly gap 21. In this way, the assembly gap 21 is used to assemble the flange portion 13 and the key 40 at the same time, which can simplify the assembly structure of the middle frame 20.

[0107] ​It can be understood that, in the case that the assembly gap 21 is used for accommodating the turn-up portion 13 and simultaneously used for accommodating the key 40, the interior of the assembly gap 21 comprises a first accommodating area and a second accommodating area, the first accommodating area is used for accommodating the turn-up portion 13, the second accommodating area is used for accommodating the key 40, and the second accommodating area is opposite to the assembly hole 121 in the X-axis direction. Then, according to the aforementioned several positional relationships between the turn-up portion 13 and the assembly hole 121 (i.e. the crossbeam 122), the sizes and relative positions of the first accommodating area and the second accommodating area also have several cases, which can be summarized as follows: the widths of the first accommodating area and the second accommodating area in the Y-axis direction can be the same or different, and the first accommodating area and the second accommodating area can be completely overlapped or partially overlapped, partially not overlapped in the Z-axis direction. For details, please refer to the aforementioned several positional relationships between the turn-up portion 13 and the assembly hole 121, which will not be further elaborated here.

[0108] Further, the assembly gap 21 can also be used for installing the related functional components matched with the key 40, please refer to Figure 18 and Figure 19 , Figure 18 is a partial view of the middle frame 20 at the assembly gap 21, Figure 19 is an assembly view of the key 40 at the assembly gap 21. The reset member 60 matched with the key 40 and the circuit board 70 are arranged in the assembly gap 21, the reset member 60 is used for realizing the reset of the key 40 after being pressed, and the circuit board 70 is used for cooperating with the key 40 to trigger the related control instructions when the key 40 is pressed.

[0109] Among them, for the reset member 60, the reset member 60 is arranged in a U-shaped structure and can be made of a metal material. The two ends of the surface of the key 40 towards the middle frame 20 are located in the assembly part 42 which extends into the assembly gap 21, and the assembly part 42 is arranged in a hook-shaped structure. The reset member 60 cooperates with one of the assembly parts 42, specifically, the reset member 60 is located between the assembly part 42 and the bottom wall of the assembly gap 21 (i.e. the surface of the assembly gap 21 towards the key 40) in the pressing direction of the key 40, when the key 40 is pressed, the reset member 60 will be extruded by the assembly part 42 to produce deformation, thereby generating the elastic force for driving the reset of the key 40. The other assembly part 42 of the key 40 is buckled at the corresponding side wall of the assembly gap 21, specifically, buckled at the limiting protrusion extending out of the side wall of the assembly gap 21, for avoiding the key 40 from being separated from the middle frame 20 and the back cover 10.

[0110] For the circuit board 70, which is arranged on the bottom wall of the assembly gap 21, the bottom wall of the assembly gap 21 is provided with a support portion 22 at a position close to the body portion 11 of the rear cover 10, the support portion 22 is arranged in a bent structure, and cooperates with the bottom wall of the assembly gap 21 to form a gap, the circuit board 70 is limited in the gap and supported by the support portion 22. The circuit board 70 is provided with a pressing contact 71, and the button 40 is provided with a pressing piece 43 on the surface facing the middle frame 20. When the button 40 is pressed, the pressing piece 43 contacts and presses the pressing contact 71, thereby generating an electrical signal on the circuit board 70 and triggering a related control instruction.

[0111] Exemplarily, the pressing piece 43 can be detachably assembled to the button 40, for example, the button 40 is provided with a recess on the surface facing the middle frame 20, and the pressing piece 43 is installed in the recess in a threaded or interference fit manner.

[0112] In other examples, please continue to refer to Figure 18 With Figure 19 , the assembly gap 21 penetrates the middle frame 20 in the Z-axis direction, that is, the assembly gap 21 extends to the two side surfaces of the middle frame 20 in the Z-axis direction respectively, and forms a gap area on the two side surfaces of the middle frame 20 respectively, which has the technical effect of facilitating the assembly of the middle frame 20 and the rear cover 10.

[0113] Specifically, based on the fact that the body portion 11 and the frame portion 12 of the rear cover 10 form a semi-open mounting space, the middle frame 20 can only be assembled into the mounting space in the Z-axis direction. However, since the inner side surface (i.e. the first surface 12a) of the frame portion 12 is provided with the flange portion 13, which protrudes from the inner side surface of the frame portion 12, it may hinder the assembly of the middle frame 20. Therefore, the assembly gap 21 is arranged to penetrate the middle frame 20 in the Z-axis direction, so that when the middle frame 20 is assembled with the rear cover 10, the flange portion 13 can enter the assembly gap 21 through the gap area formed on the surface of the middle frame 20 by the assembly gap 21, thereby avoiding the middle frame 20 and avoiding interference with the middle frame 20.

[0114] In some embodiments, please refer to Figure 20 With Figure 21 , Figure 20 is an assembly drawing of the shell assembly composed of the middle frame 20 and the rear cover 10 and the display screen 30, Figure 21 is Figure 20 a partial enlarged view of the flange portion 13. The flange portion 13 extends into the assembly gap 21 and is also used to assemble the display screen 30, that is, the flange portion 13 and the middle frame 20 jointly serve as the assembly basis of the display screen 30.

[0115] Specifically, the overall assembly manner of the display screen 30 on the shell assembly composed of the middle frame 20 and the back cover 10 is that the display screen 30 is supported on the surface (i.e., the second surface 20a) of the middle frame 20 away from the body part 11 of the back cover 10, and the part of the frame part 12 of the back cover 10 higher than the second surface 20a surrounds the display screen 30, for example, the part of the frame part 12 of the back cover 10 higher than the second surface 20a can be attached to the outer circumferential surface of the display screen 30. Due to the setting of the turn-up part 13, the assembly gap 21 for accommodating the turn-up part 13 is formed on the middle frame 20, and in some cases, due to the thin and light design of the electronic device 100, the thickness of the middle frame 20 in the Z-axis direction is limited, so the assembly gap 21 is arranged at the corner of the surface of the middle frame 20 towards the frame part 12 and the surface (i.e., the second surface 20a) towards the display screen 30, that is, the assembly gap 21 forms a gap area on the surface of the middle frame 20 towards the frame part 12 and the second surface 20a at the same time, and the gap area on the second surface 20a makes the second surface 20a discontinuous locally.

[0116] Therefore, the turn-up part 13 extending into the assembly gap 21 fills the gap area on the second surface 20a, that is, the surface (i.e., the third surface 13a) of the turn-up part 13 away from the body part 11 replaces the original second surface 20a at the gap area, and plays a role in supporting the display screen 30. In this way, the third surface 13a of the turn-up part 13 and the second surface 20a of the middle frame 20 are used to support the display screen 30 together, and on the basis of the electronic device 100 adapting to the thin and light design, the assembly reliability of the display screen 30 can be ensured.

[0117] In some examples, in the Z-axis direction, the third surface 13a of the turn-up part 13 and the second surface 20a of the middle frame 20 can be flush, or due to the size of the parts and the assembly error between the parts, there can be a height difference between the third surface 13a and the second surface 20a within a permissible range. For example, within the permissible range, the third surface 13a can be higher than or lower than the second surface 20a in the Z-axis direction, and at this time, the height difference between the third surface 13a and the second surface 20a can be compensated by a corresponding medium material. For example, adhesive material can be arranged on the third surface 13a and the second surface 20a, which is used to connect the display screen 30 and compensate for the height difference between the third surface 13a and the second surface 20a, so as to ensure the flatness and reliability of the assembly of the display screen 30.

[0118] Therefore, in some embodiments, the adhesive layer 80 formed by the adhesive material arranged on the second surface 20a and the third surface 13a, please refer to Figure 22 to Figure 24 , Figure 22 the exploded view of the adhesive layer 80 arranged on the second surface 20a and the third surface 13a, Figure 23 isFigure 22 a local enlarged view at the third surface 13a, Figure 24 Fig. 8 is a schematic view of the display screen 30 with the adhesive layer 80 attached to the second surface 20a and the third surface 13a. The adhesive layer 80 covers at least a portion of the second surface 20a and at least a portion of the third surface 13a. Thus, the second surface 20a and the third surface 13a can be attached to the display screen 30 via the adhesive layer 80, and the assembly of the display screen 30 can be achieved. In addition, the adhesive layer 80 can compensate for the height difference between the third surface 13a and the second surface 20a.

[0119] For example, the adhesive layer 80 covers the entire third surface 13a and a portion of the second surface 20a. The portion of the adhesive layer 80 attached to the second surface 20a is continuous with the portion of the adhesive layer 80 attached to the third surface 13a, i.e., the adhesive layer 80 covers the first joint 50 between the third surface 13a and the second surface 20a. In this way, the adhesive layer 80 can further compensate for the height difference between the third surface 13a and the second surface 20a.

[0120] In addition, the adhesive layer 80 can be formed by dispensing or by using an adhesive tape. The dispensing method refers to applying an adhesive material (e.g., glue) to a predetermined position (e.g., the second surface 20a and the third surface 13a) by using a dispensing device, and then connecting the parts by the adhesive material. After the adhesive material is cured, the adhesive layer 80 is formed. The adhesive tape refers to a tape made of an adhesive material and a corresponding auxiliary material. The adhesive tape is attached to a predetermined position.

[0121] In some examples, the adhesive layer 80 includes a first adhesive layer 81 and a second adhesive layer 82. The first adhesive layer 81 covers the second surface 20a, and the second adhesive layer 82 covers the third surface 13a. The end portions of the first adhesive layer 81 and the second adhesive layer 82 abut each other, so as to achieve the continuity of the adhesive layer 80. In this way, the adhesive layer 80 is divided into two parts, which can adapt to the actual assembly process and improve the flexibility of assembly.

[0122] Specifically, since the middle frame 20 and the back cover 10 are connected as a whole by assembling rather than being directly integrally formed, the middle frame 20 and the back cover 10 are respectively formed separately. Therefore, for example, the first adhesive layer 81 and the second adhesive layer 82 described above can be respectively arranged on the second surface 20a and the third surface 13a before the middle frame 20 and the back cover 10 are assembled, and then the first adhesive layer 81 and the second adhesive layer 82 abut against each other to form the complete adhesive layer 80 after the middle frame 20 and the back cover 10 are assembled. In addition, the first adhesive layer 81 and the second adhesive layer 82 can also be arranged respectively after the middle frame 20 and the back cover 10 are assembled. Therefore, based on the structure of the adhesive layer 80 composed of two parts, various assembly sequences can be met, thereby improving the flexibility of assembly.

[0123] Of course, in some cases, the adhesive layer 80 can also not adopt the structure composed of two parts, but directly adopt a monolithic structure. At this time, for the adhesive layer 80, it can only be arranged integrally on the second surface 20a and the third surface 13a after the middle frame 20 and the back cover 10 are assembled.

[0124] Meanwhile, based on the fact that the adhesive layer 80 can be formed in a dispensing manner or in a back adhesive manner, the first adhesive layer 81 and the second adhesive layer 82 can be formed in the same or different manner.

[0125] It should be noted that according to the distribution of the third surface 13a and the second surface 20a, the adhesive layer 80 can include a plurality of first adhesive layers 81. For example, the second surface 20a has an adhesive area for bonding the display screen 30, and the gap area formed by the assembly gap 21 is located in the adhesive area, so that the gap area can divide the adhesive area into two spaced sub-areas. At this time, the first adhesive layer 81 is arranged on each of the two sub-areas, so that the adhesive layer 80 includes two first adhesive layers 81. Of course, one end of the above two sub-areas is spaced by the gap area, and the other end can extend along the circumference of the middle frame 20 in the plane perpendicular to the Z axis to connect to each other, that is, the two sub-areas are connected as a whole, so that the adhesive layer 80 can include only one first adhesive layer 81.

[0126] Based on the fact that the adhesive layer 80 includes the first adhesive layer 81 and the second adhesive layer 82, in order to ensure that the adhesive layer 80 covers the first joint 50 between the third surface 13a and the second surface 20a, the first adhesive layer 81 or the second adhesive layer 82 needs to cover the first joint 50, that is, the end of the first adhesive layer 81 arranged on the second surface 20a can cover part of the third surface 13a, or the end of the second adhesive layer 82 arranged on the third surface 13a can cover part of the second surface 20a.

[0127] In other examples, please continue to refer toFigure 22 to Figure 24 For example, the part area of the second surface 20a covered by the end of the second adhesive layer 82 is recessed relative to the other part of the second surface 20a, i.e. a structure similar to a groove (hereinafter referred to as the accommodating groove 23) is formed, for accommodating the end of the second adhesive layer 82. At this time, in the Z-axis direction, the third surface 13a has a height difference with the second surface 20a, specifically, the height of the third surface 13a is lower than that of the second surface 20a, i.e. the third surface 13a is closer to the body part 11 of the back cover 10 in the Z-axis direction.

[0128] In this way, based on the accommodating groove 23 provided on the second surface 20a for accommodating the end of the second adhesive layer 82, the second adhesive layer 82 can be positioned, so as to facilitate determining the area of the second surface 20a that needs to be covered by the second adhesive layer 82, thereby facilitating the setting of the second adhesive layer 82. At the same time, the accommodating groove 23 can also limit the second adhesive layer 82, i.e. limit the possible deviation of the second adhesive layer 82 in the plane perpendicular to the Z-axis direction, thereby reducing the risk of deviation of the display screen 30 in the plane perpendicular to the Z-axis direction.

[0129] In addition, due to the presence of the accommodating groove 23, the height of the third surface 13a in the Z-axis direction is lower than that of the second surface 20a, so compared with the first adhesive layer 81, the thickness of the second adhesive layer 82 in the Z-axis direction can be set to be thicker. Based on the fact that the second adhesive layer 82 covers both the third surface 13a and the second surface 20a, it actually plays a role of connecting the middle frame 20 and the flip part 13, so the thicker second adhesive layer 82 can strengthen the reliability of the connection between the middle frame 20 and the flip part 13, and the thicker second adhesive layer 82 itself can also play a role of auxiliary strengthening of the structural strength of the flip part 13, and further strengthen the structural strength of the bezel part 12 at the assembly hole 121 together with the flip part 13.

[0130] Further, in some cases, the two sides of the third surface 13a respectively have a sub-area of the second surface 20a, i.e. the two ends of the second adhesive layer 82 respectively cover part areas of the sub-areas of the second surface 20a, at this time, the two sub-areas can be respectively provided with the above-mentioned accommodating groove 23 to respectively accommodate the two ends of the second adhesive layer 82.

[0131] In yet some examples, please continue to refer to Figure 24Since the end portions of the first adhesive layer 81 and the second adhesive layer 82 abut each other, a second joint 90 is formed at the abutting position, and the second joint 90 can have a risk of liquid entering. For example, external liquid (such as rainwater) can flow to the adhesive layer 80 from the gap between the display screen 30 and the frame portion 12 of the rear cover 10, and then further enter the inside of the middle frame 20 through the second joint 90. Therefore, the second joint 90 needs to be designed to prevent liquid from entering.

[0132] For example, referring to Figure 25 to Figure 27 , Figure 25 FIG. 1 is a structural schematic diagram of the first adhesive layer 81, Figure 26 FIG. 2 is a structural schematic diagram of the second adhesive layer 82, Figure 27 FIG. 3 is a partial schematic diagram of the abutting position of the end portions of the first adhesive layer 81 and the second adhesive layer 82. The first adhesive layer 81 includes a first region 811 and a second region 812. The first region 811 is the main body of the first adhesive layer 81, and the second region 812 is an extension structure arranged in a partial region at the end portion of the first region 811. Similarly, the second adhesive layer 82 includes a third region 821 and a fourth region 822. The third region 821 is the main body of the second adhesive layer 82, and the fourth region 822 is an extension structure arranged in a partial region at the end portion of the third region 821. When the first adhesive layer 81 and the second adhesive layer 82 abut, the end portion of the second region 812 abuts the end portion of the third region 821, the end portion of the fourth region 822 abuts the end portion of the first region 811, and the second region 812 and the fourth region 822 are distributed and abut each other in a direction perpendicular to the first surface 12a (i.e., the X-axis direction), so that the abutting position of the first adhesive layer 80 and the second adhesive layer 82 forms a joint structure.

[0133] In this way, the joint structure at the abutting position of the first adhesive layer 81 and the second adhesive layer 82 forms a zigzag second joint 90. Compared with a straight-line second joint 90, the zigzag second joint 90 has a longer extension path, so that the flow path of the liquid can be lengthened, and the possibility of the liquid finally entering the inside of the electronic device 100 can be reduced, thereby reducing the risk of failure of the electronic device 100 due to liquid entering.

[0134] Based on the above-mentioned adhesive layer 80 covering the first joint 50 between the third surface 13a and the second surface 20a, for example, the end portion of the second adhesive layer 82 arranged on the third surface 13a covers a partial region of the second surface 20a. At this time, the second adhesive layer 82 covers the above-mentioned first joint 50, and the position of the above-mentioned second joint 90 is staggered with the position of the first joint 50 in a plane perpendicular to the Z-axis direction. This can avoid the external liquid flowing directly through the first joint 50 and the second joint 90, and can also lengthen the flow path of the liquid and reduce the possibility of the liquid finally entering the inside of the electronic device 100.

[0135] In some embodiments, the application further provides a method for manufacturing the back cover 10 with the flange part 13, referring to Figure 28 , Figure 28 FIG. 1 is a schematic diagram of a manufacturing process of the back cover 10 with the flange part 13 according to an embodiment of the application, and the manufacturing method comprises the following steps:

[0136] S100: stamping the raw material plate to manufacture the back cover 10 with the body part 11 and the frame part 12.

[0137] S200: extruding the frame part 12 along the Z-axis direction to compress the height of the frame part 12 in the Z-axis direction and increase the thickness of the frame part 12 in the X-axis direction.

[0138] S300: performing a closing process on the frame part 12 at a predetermined position to preliminarily form the flange part 13.

[0139] S400: removing the excess part on the body part 11, the frame part 12 and the flange part 13 by numerical control machining (the part in dotted line in FIG. 4 represents the removed part), and finally obtaining the finished back cover 10 with the flange part 13. Figure 28

[0140] In the description of the present specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0141] The above description is merely specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.​

Claims

1. A housing assembly used in an electronic device, characterized in that, The housing assembly comprises a middle frame and a back cover, the back cover comprises a body part and a frame part, the frame part is fixed to the surface of the body part and extends along the edge of the body part, the middle frame is arranged on the inner side of the frame part, the frame part has a first surface facing the middle frame, and a recess is formed on the first surface; The back cover further comprises a turning part, the turning part is arranged on the first surface, the turning part is located on the side of the recess away from the body part, and the turning part is connected with the middle frame.

2. The housing assembly of claim 1, wherein, The middle frame is provided with an assembly notch, and the turning part extends into the assembly notch.

3. The housing assembly of claim 2, wherein, The surface of the middle frame away from the body part is a second surface, the surface of the turning part away from the body part is a third surface, and the display screen of the electronic device is supported on the second surface and the third surface.

4. The housing assembly of claim 3, wherein, The housing assembly further comprises an adhesive layer, the adhesive layer covers at least part of the third surface and at least part of the second surface, and the display screen is fixedly connected with the middle frame through the adhesive layer.

5. The housing assembly of claim 4, wherein, The adhesive layer comprises a first adhesive layer and a second adhesive layer, the first adhesive layer is arranged on the second surface, the second adhesive layer is arranged on the third surface, and the end of the second adhesive layer abuts against the end of the first adhesive layer.

6. The housing assembly of claim 5, wherein, The first adhesive layer comprises a first region and a second region, the second region is arranged at the end of the first region, the second adhesive layer comprises a third region and a fourth region, and the fourth region is arranged at the end of the third region; The end of the second region away from the first region abuts against the third region, the end of the fourth region away from the third region abuts against the first region, the second region and the fourth region are distributed in the direction perpendicular to the first surface and abut against each other.

7. The housing assembly of claim 5, wherein, The end of the first adhesive layer covers part of the third surface; Alternatively, the end of the second adhesive layer covers part of the second surface.

8. The housing assembly of claim 2, wherein, The assembly notch penetrates through the two side surfaces of the middle frame in the thickness direction of the electronic device.

9. The housing assembly of any one of claims 2 to 8, wherein, The recess forms an assembly hole through the outer surface of the frame part, the housing assembly further comprises a key, the key is arranged in the assembly hole, and one end of the key inside the housing assembly extends into the assembly notch.

10. The housing assembly of claim 9, wherein, The assembly hole is provided with a connecting part, and the two ends of the connecting part are respectively connected with the two side walls in the assembly hole distributed in the thickness direction of the electronic device.

11. The housing assembly of claim 10, wherein, The key is provided with a avoiding slot on the surface facing the inside of the housing assembly, and the projection of the connecting part on the surface of the key is located in the avoiding slot.

12. The housing assembly of any one of claims 1 to 8, wherein, The recess and the turning part both extend along the extension direction of the frame part.

13. The housing assembly of claim 12, wherein, The surface of the frame part away from the body part is a fourth surface, and at least part of the turning part is located between the fourth surface and the recess in the thickness direction of the electronic device.

14. The housing assembly of claim 13, wherein, In the extension direction of the frame part, the length of the turning part is greater than or equal to the length of the recess.

15. An electronic device, comprising: The housing assembly comprises the housing assembly according to any one of claims 1 to 14.

Images