Welding blank, middle frame, folding screen equipment and electronic equipment

Abstract

The embodiment of the utility model provides a welding blank, a middle frame, folding screen equipment and electronic equipment, relates to the technical field of electronic equipment, and aims to improve the reliability of the welding blank while reducing the weight. The welding blank comprises a center area and a plurality of corner areas arranged around the center area. The central area comprises a first part; a first portion of the central region is disposed between adjacent corner regions of the plurality of corner regions; the welding blank further comprises a first substrate and a second substrate. The first substrate is connected with the second substrate; the first substrate is arranged in the central area; the second substrate is arranged in the corner area; the first substrate comprises a first metal material, and the second substrate comprises a second metal material; the yield strength of the second metal material is higher than that of the first metal material.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of electronic devices, and in particular, to a welding blank, a middle frame, a folding screen device, and an electronic device. Background Art

[0002] With the popularization of portable electronic devices, the weight of electronic devices has a significant impact on their portability. For example, mobile phones are currently the most frequently used portable electronic devices by consumers, and the weight of mobile phones is a key factor affecting their portability. Reducing the weight of mobile phones has always been the direction of continuous iteration and efforts of mobile phone products. In order to reduce the weight of electronic devices, die-castings made of lightweight alloys such as magnesium alloys can be directly used to manufacture the middle frame components in electronic devices. However, magnesium alloys cannot simultaneously meet the requirements of yield strength and weight. Utility Model Content

[0003] The embodiments of the present application provide a welding blank, a middle frame, a folding screen device, and an electronic device, which are used to improve the reliability of electronic devices while reducing weight.

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

[0005] In a first aspect, a welding blank is provided. The welding blank includes: a central region and a plurality of corner regions arranged around the central region; the central region includes a first part; the first part of the central region is arranged between adjacent corner regions among the plurality of corner regions; the welding blank further includes: a first substrate and a second substrate; the first substrate is connected to the second substrate; the first substrate is arranged in the central region; the second substrate is arranged in the corner region; the first substrate includes a first metal material, and the second substrate includes a second metal material; the yield strength of the second metal material is higher than that of the first metal material.

[0006] Considering that during use, the four corners of an electronic device are prone to being knocked, and when the electronic device falls or is impacted, the corners are very likely to be the first parts to contact the ground or other hard objects, which may further cause the screen to break or other damages. For this reason, the welding blank provided by the embodiments of the present application sets a second metal material with a higher yield strength in the corner regions and a first metal material with a lower yield strength in other places. Thus, the drop reliability of the welding blank can be improved on the premise of reducing the weight of the welding blank.

[0007] In some alternative embodiments, the yield strength of the second metal material is greater than or equal to 300 MPa.

[0008] In some alternative embodiments, the second metal material comprises at least one or a combination of more than one of the following: aluminum alloy, magnesium-aluminum laminated composite material, and magnesium alloy. Since the yield strengths of aluminum alloy, magnesium-aluminum laminated composite material, and magnesium alloy are relatively high, the yield strength of the corner region of the welded blank can be ensured. Moreover, after surface treatment, aluminum alloy, magnesium-aluminum laminated composite material, and magnesium alloy can exhibit a high-class luster and feel.

[0009] In some alternative embodiments, the thermal conductivity of the first metal material is higher than that of the second metal material. Thereby, the heat dissipation capacity of the welded blank is improved.

[0010] In some alternative embodiments, the thermal conductivity of the first metal material is greater than or equal to 80 w / m·K. Thereby, it is ensured that the place where the first substrate is provided has good heat dissipation capacity.

[0011] In some alternative embodiments, the first metal material comprises at least one or a combination of more than one of the following: magnesium alloy, magnesium-lithium alloy. Since the densities of magnesium alloy and magnesium-lithium alloy are relatively low and they have good thermal conductivity, the weight of the welded blank can be effectively reduced and the heat dissipation performance of the welded blank can be improved.

[0012] In some alternative embodiments, the corner region includes a first corner region, a second corner region, a third corner region, and a fourth corner region; the central region further includes a second part and a third part; a first part of the central region is provided between the first corner region and the second corner region; a second part of the central region is provided between the second corner region and the third corner region; a third part of the central region is provided between the third corner region and the fourth corner region; the first corner region and the fourth corner region are connected.

[0013] In some alternative embodiments, the corner region includes a first corner region, a second corner region, a third corner region, and a fourth corner region; the first corner region and the second corner region are connected; the third corner region and the fourth corner region are connected; a first part of the central region is provided between the first corner region and the fourth corner region and is also provided between the second corner region and the third corner region.

[0014] In some alternative embodiments, the first substrate and the second substrate are connected by a weld seam.

[0015] In some alternative embodiments, the shape of the weld seam is linear or arc-shaped.

[0016] In some alternative embodiments, when the first substrate and the second substrate are connected by friction stir welding process, the width of the weld seam is 4 - 16 mm.

[0017] Second aspect, a middle frame is provided. The middle frame is formed by preparing a welding blank, and the middle frame includes: a middle plate and a frame disposed on the outer periphery of the middle plate, wherein the middle plate includes a first substrate, and the frame includes a second substrate.

[0018] In some alternative embodiments, the middle plate further includes a part of the second substrate.

[0019] In some alternative embodiments, the middle frame further includes a surface treatment layer, and the surface treatment layer is disposed on the surfaces of the middle plate and the frame.

[0020] Third aspect, a folding screen device is provided. The folding screen device includes a display screen, a rotating shaft, and a plurality of middle frames. The rotating shaft is connected between two middle frames, and the display screen is connected to the middle frames; the display screen includes a plurality of display areas and a bending area located between adjacent display areas, the display areas correspond to the middle frames one by one, and the rotating shaft corresponds to the bending area.

[0021] Fourth aspect, an electronic device is provided. The electronic device includes a display screen, a rear cover, and a middle frame. The display screen is connected to one side of the middle frame, and the rear cover is connected to the other side of the middle frame.

[0022] Wherein, for the technical effects brought by any possible implementation manner in the second aspect to the fourth aspect, reference may be made to the technical effects brought by different implementation manners in the first aspect above, which will not be elaborated herein. Description of the Drawings

[0023] Figure 1 Schematic structural diagram of the electronic device provided by the embodiment of the present application;

[0024] Figure 2 Schematic structural diagram of the electronic device provided by another embodiment of the present application;

[0025] Figure 3 Schematic structural diagram of the middle frame provided by the embodiment of the present application;

[0026] Figure 4 Schematic structural diagram of the middle frame provided by another embodiment of the present application;

[0027] Figure 5 Schematic structural diagram of the middle frame provided by another embodiment of the present application;

[0028] Figure 6 Schematic structural diagram of the welding blank provided by the embodiment of the present application;

[0029] Figure 7 Schematic structural diagram of the welding blank provided by the embodiment of the present application;

[0030] Figure 8 Schematic structural diagram of the welding blank provided by another embodiment of the present application;

[0031] Figure 9 Schematic diagram of the welding blank provided by another embodiment of the present application;

[0032] Figure 10 Schematic diagram of the welding blank provided by another embodiment of the present application;

[0033] Figure 11 Schematic diagram of the welding blank provided by another embodiment of the present application;

[0034] Figure 12 Schematic diagram of the welding blank provided by another embodiment of the present application;

[0035] Figure 13 Schematic diagram of the welding blank provided by another embodiment of the present application;

[0036] Figure 14 Schematic diagram of the welding blank provided by another embodiment of the present application;

[0037] Figure 15 Schematic diagram of the folding screen device provided by an embodiment of the present application;

[0038] Figure 16 Schematic diagram of the folding screen device provided by another embodiment of the present application. Detailed implementation manners

[0039] In order to make the objectives, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings.

[0040] Hereinafter, terms such as "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0041] In addition, in the embodiments of the present application, orientation terms such as "upper" and "lower" are defined relative to the orientation in which the components in the drawings are schematically placed. It should be understood that these directional terms are relative concepts, and they are used for relative description and clarification, and they may change accordingly with the change of the orientation in which the components in the drawings are placed.

[0042] An embodiment of the present application provides an electronic device. The electronic device may be a network video recorder (NVR), a digital video recorder (DVR), a computer host, a server, a tablet computer, a mobile phone, an e-reader, a remote control, a personal computer (PC), a laptop, a personal digital assistant (PDA), a vehicle-mounted device, a network TV, a wearable device, a TV set, and other products, as well as intelligent display wearable products such as smart watches and smart bracelets. The embodiment of the present application does not impose special restrictions on the form of the above-mentioned electronic devices. For the convenience of description, the following embodiments are all exemplified by taking the electronic device as a mobile phone.

[0043] As Figure 1 shown, the electronic device 100 includes a display module 10, a middle frame 11, and a rear cover (or called a rear shell) 12. The middle frame 11 is located between the display module 10 and the rear cover 12. The display module 10, the middle frame 11, and the rear cover 12 may be respectively disposed on different layers in the thickness direction of the electronic device, and these layers may be parallel to each other. The plane where each layer is located may be called the X-Y plane, and the direction perpendicular to the X-Y plane may be called the Z direction. That is to say, the display module 10, the middle frame 11, and the rear cover 12 may be distributed in layers in the Z direction.

[0044] The display module 10 is used to display information such as images, texts, and videos, and provide information interaction. The display module 10 may be a light-emitting diode display screen, a liquid crystal display screen, or the like, and is not limited thereto. The display module 10 may be a flexible screen with a bending characteristic, that is, a folding screen, or a rigid display screen. Exemplarily, after the flexible printed circuit (FPC) 101 as Figure 1 shown passes through the middle frame 11, it is connected to the printed circuit board (PCB) 110 disposed on the middle frame 11. Thus, display data can be transmitted to the display module 10 to control the display module 10 to display information such as images, texts, and videos.

[0045] The rear cover 12 forms the rear housing of the electronic device 100. The rear cover 12 is used to protect the electronic components inside the electronic device 100 from water and dust, and ensure the appearance neatness of the electronic device 100. The forming material of the rear cover 12 may be a conductive material such as metal, or a non-conductive material such as glass or plastic. When the forming material of the rear cover 12 is a conductive material such as metal, the rear cover 12 may be used as the reference ground of the electronic components or radio frequency components inside the electronic device 100.

[0046] The middle frame 11 is located between the display module 10 and the rear cover 12. The rear cover 12 is connected to the middle frame 11 to form a receiving cavity, and a plurality of electronic devices are encapsulated in this cavity, so as to prevent external moisture and dust from invading the receiving cavity and affecting the performance of the internal electronic devices.

[0047] In some examples, as Figure 2 shown, the electronic devices can be received in the cavity. The electronic devices can include components such as a printed circuit board 110, a battery 112, a camera 113, a speaker 114, etc. The electronic devices also include a processor 120, a power management integrated circuit (PMIC) 140, at least one power amplifier (PA) 141, at least one envelope tracking modulator (ETM) 151 for powering the power amplifier, a switching switch 153, and an antenna circuit 154, etc. Among them, different power amplifiers 141 support different frequency bands and are used to amplify transmission signals of different frequency bands. Different envelope tracking modulators ETM151 support different bandwidths. The printed circuit board 110 also includes a PPG sensor 160, where the PPG sensor 160 includes a detector 161 and a light emitting device driving circuit 162; the detector 161 is used to detect the test optical signal of the light emitting device of the light emitting device driving circuit 162 reflected and / or scattered by the detection object. In addition, the internal components can also include components such as couplers, filters, low noise amplifiers, audio codecs, internal memories, sensors, inductors, and capacitors. For the sake of clearly showing this embodiment, filters, low noise amplifiers, audio codecs, internal memories, sensors, inductors, and capacitors are not Figure 2 shown in

[0048] In some embodiments, the components on the printed circuit board 110 can be arranged on one side of the printed circuit board 110 (for example, the side facing the rear cover 12). In some embodiments, the components on the printed circuit board 110 can be arranged on both sides of the printed circuit board 110 (for example, on the side facing the rear cover 12 and the side facing the display module 10 respectively).

[0049] In addition, the structure schematically shown in the embodiments of the present application does not constitute a specific limitation on the electronic device 100. The electronic device 100 can include more or fewer components than Figure 1 and Figure 2 shown, or combine certain components, or split certain components, or have different component arrangements.

[0050] Next, refer toFigures 3 to 14 , the middle frame 11 of the embodiments of the present disclosure will be described in detail.

[0051] An embodiment of the present application provides a middle frame 11, as Figure 3 shown, the middle frame 11 includes a middle plate 22 and a frame 21 disposed on the outer periphery of the middle plate 22. Alternatively, the middle plate 22 may also be referred to as an inner frame. The middle plate 22 includes a first metal material, and the frame 21 includes a second metal material. Exemplarily, the first metal material is a magnesium alloy, and the second metal material is an aluminum alloy. Thus, the middle plate 22 and the frame 21 can be connected by riveting or welding.

[0052] In this embodiment, the middle plate 22 and the frame 21 use different metal materials respectively, so as to improve the mechanical strength of the middle frame 11 and be able to dissipate heat well while ensuring the electrical conductivity of the middle frame 11. However, compared with the first metal material, the density of the second metal material in the frame 21 is relatively large. For example, the density of aluminum is 2.7 g / cm 3 , and the density of magnesium is 1.8 g / cm 3 , so the weight reduction amplitude of the middle frame 11 provided in this embodiment is limited and cannot meet the user's requirements.

[0053] In order to further reduce the weight of the middle frame 11, in some alternative embodiments, the middle plate 22 and the frame 21 are made of the same material with a relatively light weight. For example, the frame 21 and the middle plate 22 are made of a rare earth magnesium alloy with a high yield strength, or the frame 21 and the middle plate 22 are made of a magnesium alloy with high thermal conductivity. The yield strength of the rare earth magnesium alloy with a high yield strength is 300-350 Mpa, and it has good reliability. However, the raw material price of the rare earth magnesium alloy with this yield strength is relatively expensive, and applying it to the middle frame 11 will increase the cost. Moreover, the thermal conductivity coefficient of the rare earth magnesium alloy with a high yield strength is less than 70 w / m·k, and its thermal conductivity is poor. The thermal conductivity coefficient of the magnesium alloy with high thermal conductivity is greater than or equal to 80 w / m·k, and it has good thermal conductivity. However, its yield strength is not good and it is difficult to meet the reliability requirements of electronic devices.

[0054] Therefore, an embodiment of the present application further provides a middle frame 11, which is prepared from the welding blank provided in the following embodiments. As Figure 4 shown, the middle frame 11 includes a middle plate 22 and a frame 21 disposed on the outer periphery of the middle plate 22. Among them, the middle plate 22 includes a first substrate 230, and the frame 21 includes a second substrate 240. The first substrate 230 includes a first metal material, and the second substrate 240 includes a second metal material; the yield strength of the second metal material is higher than that of the first metal material.

[0055] In some alternative examples, the shape of the border 21 can be approximately rectangular. Correspondingly, the shape of the middle plate 22 can be approximately rectangular. Then, as Figure 5 shown, the border 21 includes four corner regions 23 and an edge region 24 connecting the four corner regions 23. The middle plate 22 includes four corner regions 25 and a central region 26. The first substrate 230 can be disposed in the central region 26 of the middle plate 22 and the edge region 24 of the border 21. The second substrate 240 is disposed in the four corner regions 23 of the border 21 and the four corner regions 25 of the middle plate 22. That is, the middle plate 22 includes a part of the first substrate 230 and a part of the second substrate 240, and the border 21 includes another part of the first substrate 230 and another part of the second substrate 240. Since the yield strength of the second metal material in the second substrate 240 is greater than that of the first metal material in the first substrate 230, the middle frame 11 provided in this embodiment improves the drop reliability of the middle frame 11 by providing a second metal material with a higher yield strength at the vulnerable parts and a first metal material with a lower yield strength in the remaining parts.

[0056] It can be understood that the shapes of the middle plate 22 and the border 21 provided in the embodiments of the present application are not limited to this, and the shapes of the middle frame 11 and the border 21 can be set arbitrarily according to design requirements.

[0057] In some alternative embodiments, the middle frame 11 further includes a surface treatment layer, and the surface treatment layer is disposed on the surface of the welding blank.

[0058] In some specific examples, the process of forming the above surface treatment layer includes: performing multiple polishing treatments on the border 21. For example, after three polishing treatments, the precision of the polishing treatment is gradually improved. Then, electrophoretic treatment is performed on the entire middle frame 11, that is, an electrophoretic coating is formed on the border 21 and the middle plate 22. Thus, a protective film that is corrosion-resistant and oxidation-resistant is formed on the surface of the middle plate 22, which can improve the corrosion resistance and oxidation resistance of the middle frame 11 and extend the service life of the electronic device. Finally, a color effect layer is formed on the electrophoretic coating of the border 21 by physical vapor deposition (PVD) process. The color effect layer can be a multi-layer structure, such as a primer layer, an intermediate layer, and a surface color layer. Thus, the middle frame 11 can present different color effects and has a gloss.

[0059] In some other specific examples, the process of forming the above surface treatment layer includes: performing multiple polishing treatments on the frame 21, for example, three polishing treatments, and the precision of the polishing treatment is gradually improved. Then, electroplating zinc deposition treatment is performed on the entire middle frame 11, that is, a metal zinc layer is formed on the frame 21 and the middle plate 22. Next, electrophoretic treatment is performed on the entire middle frame 11, that is, an electrophoretic coating is formed on the metal zinc layer. Finally, a color effect layer is formed on the metal zinc layer of the frame 21 through a physical vapor deposition (PVD) process. The color effect layer can be a multi-layer structure, for example, including a primer layer, an intermediate layer, and a surface color layer, so that the middle frame 11 can present different color effects and has a sense of luster.

[0060] In some other specific examples, the process of forming the above surface treatment layer includes: performing multiple polishing treatments on the frame 21, for example, three polishing treatments, and the precision of the polishing treatment is gradually improved. Then, electroplating zinc deposition treatment is performed on the entire middle frame 11, that is, a metal zinc layer is formed on the frame 21 and the middle plate 22. Electroplating treatment is performed on the frame 21 to form an electroplated layer on the frame 21. The electroplated layer can be a composite multi-layer structure, for example, a copper (Cu) / nickel (Ni) / chromium (Cr) composite three-layer structure, or a copper (Cu) / nickel (Ni) composite two-layer structure, or can also be a single-layer structure, for example, a nickel (Ni) layer. The thickness of the electroplated layer can be 5-25 micrometers. Finally, a color effect layer is formed on the electroplated layer of the frame 21 through a physical vapor deposition (PVD) process. The color effect layer can be a multi-layer structure, for example, including a primer layer, an intermediate layer, and a surface color layer, so that the middle frame 11 can present different color effects and has a sense of luster.

[0061] An embodiment of the present application provides a welding blank 200. As Figure 6 shown, the welding blank 200 includes: a central region 220 and a plurality of corner regions 210 disposed around the central region 220. The central region 220 includes a first part; the first part of the central region 220 is disposed between adjacent corner regions 210 among the plurality of corner regions 210.

[0062] As Figure 7 shown, the welding blank 200 further includes: a first substrate 230 and a second substrate 240; the first substrate 230 is connected to the second substrate 240; the first substrate 230 is disposed in Figure 6 the central region 220 shown; the second substrate 240 is disposed in Figure 6 the corner region 210 shown; the first substrate 230 includes a first metal material, and the second substrate 240 includes a second metal material; the yield strength of the second metal material is higher than that of the first metal material.

[0063] It can be understood that the yield strength refers to the ability of a metallic material to undergo measurable plastic deformation when the stress reaches a certain value during a mechanical test and maintain a certain stable plastic deformation for a period of time. The greater the yield strength of a metallic material, the higher the reliability of the metallic material.

[0064] Considering that during use, the four corners of the electronic device 100 are prone to being bumped, and when the electronic device falls or is impacted, the corners are very likely to be the first parts to come into contact with the ground or other hard objects, thereby causing the screen to break or other damages. For this reason, in the welding blank 200 provided in the embodiments of the present application, a second metallic material with a higher yield strength is provided in the corner regions, and a first metallic material with a lower yield strength is provided in other places. Thus, on the premise of reducing the weight of the welding blank 200, the drop reliability of the welding blank 200 can be improved.

[0065] Taking the shape of the welding blank 200 as a plate-like structure similar to a rectangle as an example, each part in the welding blank 200 in the above embodiments will be described below.

[0066] As Figure 8 shown, the welding blank 200 is a plate-like structure similar to a rectangle. Then, the welding blank 200 includes a first side 201, a second side 202, a third side 203, and a fourth side 204. The first side 201 is parallel to the third side 203, and the second side 202 is parallel to the fourth side 204. The first side 201 is connected to the second side 202 to form a first corner 205, the second side 202 is connected to the third side 203 to form a second corner 206, the third side 203 is connected to the fourth side 204 to form a third corner 207, and the fourth side 204 is connected to the first side 201 to form a fourth corner 208. The area near the first corner 205 of the welding blank 200 can be referred to as a first corner region 211. Correspondingly, the area near the second corner 206 of the welding blank 200 can be referred to as a second corner region 212, the area near the third corner 207 of the welding blank 200 can be referred to as a third corner region 213, and the area near the fourth corner 208 of the welding blank 200 can be referred to as a fourth corner region 214.

[0067] The area of the welding blank 200 other than the first corner region 211, the second corner region 212, the third corner region 213, and the fourth corner region 214 can be regarded as the central region of the welding blank 200. The central region includes a first part 221, a second part 222, a third part 223, a fourth part 224, and a fifth part 225.

[0068] The first part 221 of the central area is arranged between the first corner area 211 and the second corner area 212; the second part 222 of the central area is arranged between the first corner area 211 and the fourth corner area 214; the third part of the central area is arranged between the second corner area 212 and the third corner area 213; the fourth part of the central area is arranged between the third corner area 213 and the fourth corner area 214. The fifth part 225 of the central area is the area of ​​the central area other than the first part 221, the second part 222, the third part 223 and the fourth part 224.

[0069] It should be noted that the corner area of ​​the welded embryo 200 in the embodiment of the present application is the sum of the four corner areas 23 of the frame 21 and the four corner areas 25 of the middle frame 11 provided in the above embodiment, and the central area of ​​the welded embryo 200 is Figure 5 The sum of the central area 26 of the center plate 22 and the edge area 24 of the frame 21 is shown.

[0070] Considering that the four corners of the electronic device are prone to bumps during use, and when the electronic device falls or hits, the corners are likely to be the first part to contact the ground or other hard objects, which may cause the screen to break or other damage. At the same time, considering that multiple electronic devices, such as batteries 112, processors 120, etc., need to be set in the central area of ​​the welded embryo 200 in the future, these multiple electronic devices will consume electrical energy and generate corresponding heat during operation. If this heat cannot be effectively dissipated, it will cause the internal temperature of the mobile phone to rise, and may even cause performance degradation, accelerated battery aging, or even damage.

[0071] To this end, in some optional embodiments, such as Figure 9 As shown, in Figure 8 The second substrate 240 is set in the first corner area 211, the second corner area 212, the third corner area 213 and the fourth corner area 214 of the welding embryo 200 shown, and the first substrate 230 is set in the central area of ​​the welding embryo 200. The first substrate 230 includes a first metal material, and the second substrate 240 includes a second metal material. The yield strength of the second metal material is greater than that of the first metal material, and the thermal conductivity of the first metal material is greater than that of the second metal material. That is, the second metal material with higher strength is set in the corner area that is easy to bump, and the first metal material with better thermal conductivity is set in the central area where heat dissipation is required. In this way, the strength requirements and thermal conductivity requirements of electronic equipment can be met at the same time, and the reliability of electronic equipment is improved.

[0072] In some alternative embodiments, the yield strength of the second metal material is greater than or equal to 300 MPa. The second metal material includes at least one or a combination of more than one of the following: aluminum alloy, magnesium-aluminum laminated composite material, and magnesium alloy. The aluminum alloy, magnesium-aluminum laminated composite material, and magnesium alloy have relatively high yield strengths, thus ensuring that the yield strength of the corner region of the welded blank 200 can meet the reliability requirements. Moreover, after surface treatment, the aluminum alloy, magnesium-aluminum laminated composite material, and magnesium alloy can exhibit a high-class luster and feel, enabling the middle frame 11 to reveal a high-class luster and feel. When using an aluminum alloy, its price is low, so it can not only ensure a high-class luster and feel in appearance but also reduce the manufacturing cost.

[0073] In some alternative embodiments, the thermal conductivity of the first metal material is greater than or equal to 80 w / m·k. The first metal material includes at least one or a combination of more than one of the following: magnesium alloy, magnesium-lithium alloy. Since the magnesium alloy and magnesium-lithium alloy have relatively low densities and good thermal conductivity, they can effectively reduce the weight of the welded blank 200 and improve the heat dissipation of the welded blank 200.

[0074] For example, the magnesium alloy can be magnesium alloy ZK60 with high thermal conductivity. In magnesium alloy ZK60, magnesium (Mg) is the main component with a content greater than 93%, the content of zinc (Zn) is about 4 - 6%, the content of zirconium (Zr) is about 0.45 - 0.90%, and the content of aluminum (Al) is about 0.45 - 1.5%. The thermal conductivity of this magnesium alloy ZK60 is greater than or equal to 110 w / m·k, having good thermal conductivity.

[0075] In some alternative embodiments, the first metal material and the second metal material are connected by a weld material. The weld material is the material formed by the first metal material and the second metal material during the welding process. Exemplarily, the first metal material is magnesium alloy ZK60, and the second metal material is aluminum alloy. The first substrate 230 and the second substrate 240 can be welded by friction stir welding process. The friction stir welding process generates frictional heat on the joint surface of the first substrate 230 and the second substrate 240 through a rotating non-consumable welding pin (Pin). This frictional heat locally heats and softens the surfaces of the first substrate 230 and the second substrate 240 but does not cause melting. As the welding pin advances, the first metal material and the second metal material are stirred together, thereby forming a weld between the first substrate 230 and the second substrate 240. Then, the weld material in this embodiment is the intermetallic compound formed by the aluminum-magnesium mixture and aluminum-magnesium metal. In some specific examples, the weld has a width of 4 - 16 mm.

[0076] Alternatively, when the first metal material is magnesium alloy ZK60 and the second metal material is magnesium-aluminum laminated composite material or magnesium alloy, the first substrate 230 and the second substrate 240 can be welded by friction stir welding process, laser welding process or diffusion welding. When using the laser welding process, the laser beam is focused on the surfaces of the first substrate 230 and the second substrate 240, and the generated heat energy causes partial melting of the first substrate 230 and the second substrate 240, thereby forming a weld between the first substrate 230 and the second substrate 240. Then, the weld material in this embodiment is the intermetallic compound formed by aluminum-magnesium mixture and aluminum-magnesium metal.

[0077] It should be noted that when the second metal material is magnesium-aluminum laminated composite material, the magnesium-aluminum laminated composite material includes magnesium material and aluminum material arranged in a stacked manner, and the magnesium material and the aluminum material can be welded together by explosion welding to form the magnesium-aluminum laminated composite material. The magnesium material in the magnesium-aluminum laminated composite material can be connected to the first metal material by welding, so as to realize the connection between the first substrate 230 and the second substrate 240. The specific welding methods and steps can refer to the description in the foregoing embodiments, and will not be elaborated in the embodiments of the present application.

[0078] The embodiments of the present application do not limit the shape of the weld, and the shape of the weld can be Figure 9 the straight line type shown, or can be Figure 10 the arc type shown.

[0079] Considering that in addition to the corners, the parts where sensitive devices are set or there are openings in the electronic device are also vulnerable to external forces and damaged. Therefore, in the embodiments of the present application, it is also possible to, as shown in Figure 11 , Figure 12 and Figure 13 , increase the area of the second substrate 240 set to further improve the reliability of the electronic device.

[0080] In an optional example, in the welding embryo 200 shown in Figure 11 , the welding embryo 200 includes: a plurality of corner regions and a central region 220. Among them, the corner regions include a first corner region 211, a second corner region 212, a third corner region 213, and a fourth corner region 214; the central region 220 includes a first part 221, a second part 222, and a third part 223; a first part 221 of the central region 220 is provided between the first corner region 211 and the second corner region 212; a second part 222 of the central region 220 is provided between the second corner region 212 and the third corner region 213; a third part 223 of the central region 220 is provided between the third corner region 213 and the fourth corner region 214; the first corner region 211 and the fourth corner region 214 are connected.

[0081] Considering that during the subsequent preparation process of the electronic device, openings will be made in the area near the first side of the welding embryo 200. For example, heat dissipation holes for dissipating heat of the electronic device are provided on the first side, which will reduce the impact resistance of the first side, and the openings and the surrounding areas are also prone to damage. Therefore, in this embodiment, as Figure 12 shown, a second substrate 240 is provided in the communication area between the first corner area 211, the second corner area 212, the third corner area 213 and the fourth corner area 214 shown respectively in Figure 11 and the remaining part is provided with a first substrate 230. That is, in addition to providing the second substrate 240 in the areas near the first corner 205, the second corner 206, the third corner 207 and the fourth corner 208 of the welding embryo 200, the second substrate 240 is also provided near the first side 201 of the welding embryo 200. Since the first substrate 230 has good thermal conductivity and the second substrate 240 has good strength, the welding embryo 200 provided in this embodiment can meet the heat dissipation and weight reduction requirements of the electronic device through the first substrate 230, and meet the reliability requirements of the electronic device through the second substrate 240.

[0082] In another alternative example, in the welding embryo 200 shown in Figure 13 the welding embryo 200 includes: a plurality of corner areas and a central area 220, wherein the corner areas include a first corner area 211, a second corner area 212, a third corner area 213 and a fourth corner area 214; the first corner area 211 and the second corner area 212 are connected; the third corner area 213 and the fourth corner area 214 are connected, and a first part 221 of the central area 220 is provided between the first corner area 211 and the fourth corner area 214; a first part 221 of the central area 220 is provided between the second corner area 212 and the third corner area 213, that is, the central area 220 separates the first corner area 211 from the third corner area 213 and the fourth corner area 214, and at the same time separates the second corner area 212 from the third corner area 213 and the fourth corner area 214. In this embodiment, the first part 221 of the central area 220 is the entire central area 220.

[0083] Considering that sensitive devices will be installed in the areas near the second side 202 and the fourth side 204 of the welding embryo 200 of the electronic device. For example, an antenna is provided near the second side 202 of the welding embryo 200, and devices such as a speaker and a charging interface are provided near the fourth side 204 of the welding embryo 200. These sensitive devices are easily damaged by external forces. Therefore, in this embodiment, as Figure 14 shown, in Figure 14A second substrate 240 is provided in the communication area between the first corner area 211 and the second corner area 212 shown, and in the communication area between the third corner area 213 and the fourth corner area 214. The remaining part is provided with a first substrate 230. That is, in addition to providing the second substrate 240 in the areas near the first corner 205, the second corner 206, the third corner 207, and the fourth corner 208 of the welding blank 200, the second substrate 240 is also provided in the areas near the second side 202 and the fourth side 204 of the welding blank 200. Since the first substrate 230 has good heat conduction performance and the second substrate 240 has good strength, the welding blank 200 provided in the embodiment of the present application can meet the heat dissipation and weight reduction requirements of the electronic device through the first substrate 230, and meet the reliability requirements of the electronic device through the second substrate 240.

[0084] It can be understood that the above examples are only examples listed for better understanding the technical solutions of the embodiments of the present invention, and are not the only limitations on the embodiments of the present invention. The shape of the welding blank 200 provided in the embodiments of the present application is not limited to this, and the shape of the welding blank 200 can be set arbitrarily according to design needs. At the same time, the area size and position of the first substrate 230 and the second substrate 240 provided in the welding blank 200 can also be adjusted according to design requirements, so that the prepared welding blank 200 meets the requirements of the electronic device for heat conduction and reliability.

[0085] The embodiment of the present application also provides a folding screen device 300, which can be an electronic device with a folding screen such as a mobile phone, a tablet computer, a personal computer (PC), etc. The specific form of the electronic device is not particularly limited in the embodiment of the present application.

[0086] As Figure 15 and Figure 16 shown, the folding screen device 300 (such as a folding screen mobile phone) includes a display screen 301, a rotating shaft 302, and a plurality of middle frames 11 provided in the foregoing embodiments. Figure 15 The display screen 301 shown in Figure 16 is connected to the middle frame 11 shown, and adjacent two middle frames 11 are connected by a rotating shaft 302.

[0087] The display screen 301 can be folded or unfolded. Correspondingly, the folding screen device 300 has two device forms, namely the folded state and the unfolded state. Optionally, the middle frame 11 of the folding screen device 300 can rotate along the rotation axis 302 (which can also be described as the folding edge or folding axis), thereby driving the display screen 301 to fold to form a plurality of display areas 310, and the display areas 310 correspond to the middle frame 11 one by one. For example, if there is only one rotation axis 302 in the folding screen device, correspondingly, the middle frame 11 includes a first middle frame 11-1 and a second middle frame 11-2, and the first middle frame 11-1 and the middle frame 11-2 are connected by the rotation axis 302. The first middle frame 11-1 and the second middle frame 11-2 rotate along the rotation axis 302, thereby driving the display screen 301 to fold, and folding a whole screen into two independently displayable display areas 310, such as a first display area 310a and a second display area 310b. It can be understood that the display screen located in the first display area 310a corresponds to the first middle frame 11-1, and the display screen located in the second display area 310b corresponds to the second middle frame 11-2.

[0088] Considering that the folding screen device 300 will have an opening on the side of the first middle frame 11-1 away from the second middle frame 11-2. For example, heat dissipation holes for dissipating heat of electronic devices are provided on the frame on the side of the first middle frame 11-1 away from the second middle frame 11-2, which will reduce the impact resistance of the first middle frame 11-1. At the same time, the side of the first middle frame 11-1 close to the rotation axis 302 is often squeezed by the display screen. Therefore, in some alternative embodiments, the first middle frame 11-1 is prepared from a welded blank as Figure 16 shown. The welded blank includes a first corner area 211, a second corner area 212, a third corner area 213, a fourth corner area 214, and a central area 220, wherein the first corner area 211 communicates with the fourth corner area 214, and the second corner area 212 communicates with the third corner area 213.

[0089] The welded blank is provided with a second substrate 240 in the communication areas between the first corner area 211 and the fourth corner area 214 and between the second corner area 212 and the fourth corner area 214, and a first substrate 230 is provided in the remaining parts. That is, the first middle frame 11-1 formed by preparing the welded blank 200 is provided with the second substrate 240 near the frame on the side away from the second middle frame 11-2 and near the frame on the side close to the rotation axis, and the first substrate 230 is provided in other places. Since the first substrate 230 has good heat conduction performance and the second substrate 240 has good strength, the first middle frame in the folding screen device provided in this embodiment has good reliability and heat dissipation ability.

[0090] Considering that the folding screen device is often squeezed by the display screen on the side of the second middle frame 11-2 close to the rotating shaft 302. Therefore, in some alternative embodiments, the second middle frame 11-2 is prepared from a welded blank as Figure 16 shown. The welded blank includes a first corner area 211, a second corner area 212, a third corner area 213, a fourth corner area 214 and a central area 220, wherein the first corner area 211 is connected to the fourth corner area 214, and the second corner area 212, the third corner area 213 and the connected first corner area 211 and fourth corner area 214 are separated by the central area 220. For the specific structure, reference can be made to the welded blank 200 shown in Figure 9 the foregoing embodiments, which will not be elaborated in the embodiments of the present application.

[0091] The second substrate 240 is provided in the connected areas of the second corner area 212, the third corner area 213, and the first corner area 211 and the fourth corner area 214 of the welded blank, and the first substrate 230 is provided in the remaining parts. That is, the second middle frame 11-2 formed by preparing the welded blank 200 is provided with the second substrate 240 in the second corner area 212, the third corner area 213, and near the frame on the side close to the rotating shaft. Since the first substrate 230 has good heat conduction performance and the second substrate 240 has good strength, the first middle frame in the folding screen device provided in this embodiment has good reliability and heat dissipation capacity.

[0092] It can be understood that the above examples are only examples listed for better understanding the technical solutions of the embodiments of the present invention and do not serve as the sole limitation to the embodiments of the present invention. The first middle frame and the second middle frame provided in this embodiment can be any one of the middle frames provided in the foregoing embodiments. Therefore, the foregoing embodiments and the beneficial effects brought thereby are equally applicable to this embodiment, and the same parts will not be elaborated.

[0093] The above content is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A welding embryo, characterized in that: include: a central area and a plurality of corner areas disposed around the central area; The central area includes a first portion; the first portion of the central area is disposed between adjacent corner areas among the plurality of corner areas; The welding embryo also includes: a first substrate and a second substrate; the first substrate is connected to the second substrate; The first substrate is arranged in the central area; the second substrate is arranged in the corner area; The first substrate comprises a first metal material, and the second substrate comprises a second metal material; The yield strength of the second metal material is higher than the yield strength of the first metal material.

2. The welding embryo body according to claim 1, characterized in that: The yield strength of the second metal material is greater than or equal to 300 MPa.

3. The welding embryo body according to claim 2, characterized in that: The second metal material includes at least one or more of the following combinations: aluminum alloy, magnesium-aluminum layered composite material and magnesium alloy.

4. The welding embryo body according to claim 2, characterized in that: The second metal material includes a magnesium-aluminum layered composite material, wherein the magnesium-aluminum layered composite material includes a magnesium material, and the magnesium material is connected to the first metal material by welding.

5. The welding embryo body according to any one of claims 1 to 3, characterized in that: The thermal conductivity of the first metal material is higher than the thermal conductivity of the second metal material.

6. The welding embryo body according to claim 4, characterized in that: The thermal conductivity of the first metal material is greater than or equal to 80w / mk.

7. The welding embryo body according to claim 5, characterized in that: The first metal material includes at least one or more of the following combinations: one or more of magnesium alloy and magnesium-lithium alloy.

8. The welding embryo body according to any one of claims 1-4, 6 and 7, characterized in that: The corner regions include a first corner region, a second corner region, a third corner region and a fourth corner region; The central area also includes a second portion and a third portion; A first portion of the central area is disposed between the first corner area and the second corner area; A second portion of the central area is disposed between the second corner area and the third corner area; A third portion of the central area is disposed between the third corner area and the fourth corner area; The first corner area and the fourth corner area are connected.

9. The welding embryo body according to claim 5, characterized in that: The corner regions include a first corner region, a second corner region, a third corner region and a fourth corner region; The central area also includes a second portion and a third portion; A first portion of the central area is disposed between the first corner area and the second corner area; A second portion of the central area is disposed between the second corner area and the third corner area; A third portion of the central area is disposed between the third corner area and the fourth corner area; The first corner area and the fourth corner area are connected.

10. The welding embryo body according to any one of claims 1-4, 6 and 7, characterized in that: The corner regions include a first corner region, a second corner region, a third corner region and a fourth corner region; The first corner area is connected to the second corner area; The third corner area is connected to the fourth corner area; A first portion of the central region is disposed between the first corner region and the fourth corner region and between the second corner region and the third corner region.

11. The welding embryo body according to claim 5, characterized in that: The corner regions include a first corner region, a second corner region, a third corner region and a fourth corner region; The first corner area is connected to the second corner area; The third corner area is connected to the fourth corner area; A first portion of the central region is disposed between the first corner region and the fourth corner region and between the second corner region and the third corner region.

12. The welding embryo body according to any one of claims 1-4, 6, 7, 9, and 11, characterized in that: The first substrate and the second substrate are connected via a weld.

13. The welding embryo body according to claim 5, characterized in that: The first substrate and the second substrate are connected via a weld.

14. The welding embryo body according to claim 8, characterized in that: The first substrate and the second substrate are connected via a weld.

15. The welding embryo body according to claim 10, characterized in that: The first substrate and the second substrate are connected via a weld.

16. The welding embryo body according to claim 12, characterized in that: The shape of the weld is straight line or arc.

17. The welding embryo body according to any one of claims 13 to 15, characterized in that: The shape of the weld is straight line or arc.

18. The welding embryo body according to claim 12, characterized in that: When the first substrate and the second substrate are connected by a friction stir welding process, the width of the weld is 4-16 mm.

19. The welding embryo body according to any one of claims 13 to 16, characterized in that: When the first substrate and the second substrate are connected by a friction stir welding process, the width of the weld is 4-16 mm.

20. The welding embryo body according to claim 17, characterized in that: When the first substrate and the second substrate are connected by a friction stir welding process, the width of the weld is 4-16 mm.

21. A middle frame, the middle frame being prepared by the welded embryo body according to any one of claims 1 to 20, characterized in that: include: A middle plate and a frame arranged on the periphery of the middle plate, wherein the middle plate includes a first substrate and the frame includes a second substrate.

22. The middle frame according to claim 21, characterized in that: The midplane also includes a portion of the second substrate.

23. The middle frame according to claim 21 or 22, characterized in that: The middle frame further includes a surface treatment layer, and the surface treatment layer is arranged on the surfaces of the middle plate and the frame.

24. A folding screen device, characterized in that: It comprises a display screen, a rotating shaft, and a plurality of middle frames as claimed in any one of claims 21 to 23, wherein the rotating shaft is connected between two middle frames, and the display screen is connected to the middle frames; The display screen includes a plurality of display areas and a bending area between adjacent display areas. The display areas correspond to the middle frame one by one, and the rotating shaft corresponds to the bending area.

25. An electronic device, characterized in that: It comprises a display screen, a back cover and a middle frame as described in any one of claims 21 to 23, wherein the display screen is connected to one side of the middle frame, and the back cover is connected to the other side of the middle frame.

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