Rear cover assembly, metal decoration plate and electronic equipment

Abstract

The embodiment of the invention provides a rear cover assembly, a metal decoration plate and electronic equipment, the rear cover assembly is suitable for being combined on a body of the electronic equipment, a main board is arranged in the body, the rear cover assembly comprises a cover plate, a metal decoration plate and a metal decoration plate, the cover plate is detachably connected with the body, and a mounting opening is formed in the cover plate; the metal decorative plate is connected to the mounting port and is provided with at least one electric connecting end extending towards the mainboard, and the end part of the electric connecting end is provided with a contact part which is used for being connected with a circuit structure on the mainboard; wherein the material hardness of the contact part is different from the material hardness of the metal decorative plate, and the material hardness of the contact part is matched with the material hardness of the circuit structure. In the technical scheme provided by the invention, the material hardness of the contact part on the metal decorative plate is matched with the material hardness of the circuit structure, so that when the metal decorative plate and the main board are in contact, a good electric connection effect between the metal decorative plate and the main board can be ensured, and meanwhile, the problem of abrasion of the circuit structure can be improved.

Description

Technical Field

[0001] This application relates to the technical field of intelligent terminal devices, and particularly to a rear cover assembly, a metal decorative plate, and an electronic device. Background Art

[0002] Currently, in order to achieve the lightweight of the whole machine and enhance the structural strength of the whole machine in the design of electronic devices (such as mobile phones, tablets, etc.), materials with higher strength, such as titanium alloy materials, are usually selected to manufacture key structural components such as the middle frame, shaft cover, and decorative parts of the electronic device.

[0003] However, when these high-strength structural components are electrically connected to the main board, the electrical connection ends on the structural components that contact the main board will wear the circuit structure on the main board, thereby affecting the electrical connection effect between the main board and the electrical connection ends, and the performance of the electronic device will inevitably be affected. Summary of the Invention

[0004] In view of the above problems, this application provides a rear cover assembly, a metal decorative plate, and an electronic device to solve the above problems or at least partially solve the above problems.

[0005] In an embodiment of this application, a rear cover assembly is provided, which is adapted to be combined with the body of an electronic device, and a main board is arranged in the body. The rear cover assembly includes:

[0006] A cover plate, detachably connected to the body, and an installation opening is provided on the cover plate;

[0007] A metal decorative plate, connected to the installation opening, and provided with at least one electrical connection end extending towards the main board. A contact portion is provided at the end of the electrical connection end for connecting with the circuit structure on the main board;

[0008] Wherein, the material hardness of the contact portion is different from that of the metal decorative plate, and the material hardness of the contact portion matches that of the circuit structure.

[0009] Optionally, the circuit structure is a grounding end or a feeding end;

[0010] When the circuit structure is a grounding end, it is used to connect the metal decorative plate to the grounding circuit on the main board;

[0011] When the circuit structure is a feeding end, it is used to output signal current to the metal decorative plate.

[0012] Optionally, the circuit structure further includes a conductive elastic sheet, and the conductive elastic sheet is elastically connected to the contact portion.

[0013] Optionally, the contact portion is a conductive material plating layer, a conductive material curing layer, or a conductive composite material layer.

[0014] Optionally, the composition material of the metal veneer is titanium metal or titanium alloy, and the contact part is a nickel plating layer or a cured conductive silver paste layer.

[0015] Optionally, the contact part is a conductive member, a first connection part is provided on the conductive member, and a second connection part is provided on the electrical connection end;

[0016] The first connection part is cooperatively connected to the second connection part so that the conductive member is connected to the electrical connection end.

[0017] Optionally, the second connection part is a limiting groove, the first connection part is a convex block, and the convex block is fitted into the limiting groove;

[0018] The thickness of the convex block is greater than the depth of the limiting groove.

[0019] Optionally, the limiting groove further includes an avoidance space located on the side wall of the electrical connection end;

[0020] The convex block further includes an extension section, and the extension section is bent and connected to one side of the convex block;

[0021] When the convex block is connected to the limiting groove, the extension section is arranged in the avoidance space.

[0022] Optionally, the contact part further includes a holding section and an elastic arm;

[0023] The holding section is arranged on the electrical connection end, one end of the elastic arm is bent and connected to the holding section, the other end extends away from the electrical connection end and corresponds to the circuit structure.

[0024] Optionally, it further includes an inner lining plate arranged on the metal decorative plate or the inner wall surface of the cover plate, and through holes are arranged on the inner lining plate;

[0025] When the metal veneer is combined on the outer wall surface of the cover plate, the electrical connection end passes through the through hole and extends towards the inner wall surface of the cover plate;

[0026] An electrical connector is arranged on the side of the inner lining plate facing the metal veneer, and the end of the electrical connector is connected to the metal veneer.

[0027] Optionally, the electrical connector is a metal elastic member, a carving structure is arranged on a partial surface of the metal veneer corresponding to the metal elastic member, and the metal elastic member contacts the carving structure.

[0028] In an embodiment of the present application, a metal veneer is further provided, which can be applied to the back cover of an electronic device, including:

[0029] Plate body;

[0030] Electric connection terminal, which is arranged on the inner surface of the plate body and extends away from the plate body;

[0031] Wherein, a contact part is arranged at the end of the electric connection terminal for connecting with the circuit structure on the electronic device;

[0032] The material hardness of the contact part is different from that of the plate body, and the material hardness of the contact part matches that of the circuit structure.

[0033] In another embodiment of the present application, an electronic device is further provided, including a device body and the above-mentioned metal decorative plate. The device includes a main body and a rear cover, and the rear cover is detachably connected to the main body;

[0034] The metal decorative plate is connected to the rear cover, and a main board is further arranged in the main body, and the contact part is connected to the circuit structure on the main board.

[0035] In still another embodiment of the present application, an electronic device is further provided, including a main body and the above-mentioned rear cover assembly, and the rear cover assembly is detachably connected to the main body.

[0036] In the technical solution provided by the present application, by using titanium alloy as the material of the metal decorative plate, not only can the electronic device have the lightweight characteristics of titanium alloy, effectively reducing the overall weight of the electronic device, but also the overall strength is improved. In addition, the material hardness of the contact part on the metal decorative plate matches that of the circuit structure. When the two are in contact, not only can a good electrical connection effect between the metal decorative plate and the main board be ensured, but also the wear problem of the circuit structure can be improved. Description of the Drawings

[0037] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0038] Figure 1 It is a schematic diagram of the electronic device provided by the embodiment of the present application;

[0039] Figure 2 It is a schematic diagram of the rear cover assembly provided by the embodiment of the present application;

[0040] Figure 3 It is an exploded schematic diagram of the rear cover assembly provided by the embodiment of the present application;

[0041] Figure 4 It is a partial cross-sectional view of the rear cover assembly provided by the embodiment of the present application;

[0042] Figure 5 A partial enlarged schematic view of an electrical connection end provided in an embodiment of the present application;

[0043] Figure 6 A partial cross-sectional view of an electrical connection end provided in an embodiment of the present application;

[0044] Figure 7 A partial cross-sectional view of a rear cover assembly provided in an embodiment of the present application;

[0045] Figure 8 A partial cross-sectional view of a rear cover assembly provided in another embodiment of the present application;

[0046] Figure 9 A partial cross-sectional view of a rear cover assembly provided in other embodiments of the present application;

[0047] Figure 10 An exploded schematic view of a rear cover assembly provided in an embodiment of the present application from another perspective;

[0048] Figure 11 A partial cross-sectional view of a metal decorative plate and an inner lining plate provided in an embodiment of the present application. Detailed implementation manners

[0049] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and the corresponding drawings. Apparently, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0050] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, such that a process, method, commodity or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, commodity or device including the said element.

[0051] See Figures 1 to 4, in an embodiment of the present application, a rear cover assembly 11 is provided. The rear cover assembly 11 is adapted to be coupled to the body 12 of the electronic device 1, and a main board 15 is disposed within the body 12 of the electronic device 1. The main board 15 is an integrated circuit board, integrating various electronic chips, electronic components, etc. The electronic device 1 includes, but is not limited to: mobile phones, tablet computers, smart watches, laptop computers, etc., and is not limited to a specific type. Hereinafter, the electronic device 1 being a mobile phone will be taken as an example for a detailed introduction.

[0052] The electronic device 1 includes a rear cover assembly 11 and a body 12. The rear cover assembly 11 is detachably connected to the body 12, and the body 12 is provided with structures such as a middle frame, a display screen, and a main board 15. Among them, the middle frame is used to fix and support various components on the electronic device 1. The display screen is for the electronic device 1 to display images, texts, and other contents for users to view and operate. The main board 15 is the core electronic component of the electronic device 1, including a processor, a memory, a battery management circuit, as well as various sensors and interfaces, enabling the electronic device 1 to perform various functions and tasks. In addition, the main board 15 is provided with a circuit structure 4.

[0053] Further, the rear cover assembly 11 includes a cover plate 13 and a metal decorative plate 2. The cover plate 13 is detachably connected to the body 12. The cover plate 13 is used to form a protective shell to prevent the interior of the electronic device 1 from being damaged by external forces such as scratches, squeezes, or impacts, and an installation opening 14 is provided on the cover plate 13. The metal decorative plate 2 is connected to the installation opening 14. The metal decorative plate 2 can be detachably connected to the cover plate 13 or fixedly connected. In addition, at least one electrical connection end 3 extending toward the main board 15 is provided on the metal decorative plate 2, and a contact portion 31 is provided at the end of the electrical connection end 3 for connecting to at least one circuit structure 4 on the main board 15.

[0054] In a specific embodiment, the cover plate 13 is the rear cover of the mobile phone, and the metal decorative plate 2 is a decorative part of the mobile phone camera module. Usually, the decorative part made of metal can also be used as the antenna structure of the mobile phone. Therefore, the metal decorative plate 2 needs to be connected to the circuit structure 4, and the circuit structure 4 is the radio frequency signal circuit of the antenna. When the metal decorative plate 2 is connected to the circuit structure 4, the metal decorative plate 2 can radiate electromagnetic waves corresponding to the radio frequency signal. Therefore, the stability of the connection between the metal decorative plate 2 and the circuit structure 4 is an important factor in ensuring the stability of the antenna signal.

[0055] In addition, in order to effectively reduce the overall weight of the electronic device 1 and improve the overall strength, the frame, the cover plate 13 and the metal decorative plate 2 are made of a lightweight and high-strength titanium alloy. Since the material hardness of the titanium alloy is usually relatively high, while the material hardness of the circuit structure 4 on the main board 15 is relatively low, for example: metals such as copper, gold, and silver. If the contact portion 31 of the metal decorative plate 2 directly contacts the circuit structure 4, it is easy to cause wear of the circuit structure 4. Therefore, in the technical solution provided in this application, the material hardness of the contact portion 31 is different from that of the metal decorative plate 2, and the material hardness of the contact portion 31 matches the material hardness of the circuit structure 4, thereby effectively solving the problem of wear of the circuit structure 4.

[0056] It should be noted that the material hardness of the contact portion 31 matches the material hardness of the circuit structure 4, which can be understood as that the material of the contact portion 31 is the same as that of the circuit structure 4, or the material hardness of the contact portion 31 is approximately the same as that of the circuit structure 4.

[0057] In an embodiment provided in this application, the electrical connection terminals 3 on the metal decorative plate 2 can be one or more. The electrical connection terminals 3 can be used to connect to the signal output terminals on the main board 15, or can be used to connect to the grounding line on the main board 15. For example, in order to enable the metal decorative plate 2 to emit electromagnetic wave signals of different frequency bands, multiple electrical connection terminals 3 on the metal decorative plate 2 are connected to the circuit structures 4 corresponding to different frequency band signals on the main board 15, for outputting signal current to the metal decorative plate 2. It can be understood that the circuit structures 4 of different frequency band signals are the output terminals corresponding to different frequency band signals. In addition, one electrical connection terminal 3 on the metal decorative plate 2 is also connected to the circuit structure 4 that is the grounding terminal, for grounding the metal decorative plate 2.

[0058] Furthermore, the circuit structure 4 can be a printed circuit on the main board 15, and the contact portion 31 on the electrical connection terminal 3 directly contacts the printed circuit. In order to make the connection between the electrical connection terminal 3 and the circuit structure 4 stable, usually the circuit structure 4 is a conductive elastic member. For example, see Figure 4 ., the conductive elastic member is provided on the main board 15 and is connected to the printed circuit on the main board 15. Usually, there will be a certain error when the metal decorative plate 2 is installed on the cover plate 13, and this error will cause the distances between the ends of the electrical connection terminals 3 and the main board 15 to be different, while the conductive elastic member can effectively adapt to this situation and ensure contact between the conductive elastic member and the electrical connection terminal 3. The conductive elastic member includes but is not limited to: springs, elastic sheets, conductive foam, conductive silicone, etc.

[0059] In an embodiment provided in this application, the contact portion 31 of the metal decorative plate 2 can be made in a variety of different ways, including but not limited to a conductive material plating layer, a conductive material curing layer, or a conductive composite material layer, etc. See Figure 4, in a specific embodiment, the metal decorative plate 2 and the electrical connection end 3 are integrally formed of titanium metal (with a high content of titanium metal elements, which can be considered pure titanium) or titanium alloy (a metal alloy material of titanium and other metals). The conductive material can be formed on the end face of the electrical connection end 3 facing the main board 15 by means of chemical deposition or coating and curing, or conductive particles (such as carbon nanotubes, silver particles, etc.) and resin (or other polymers) are combined into a conductive composite material, and are formed on the end face of the electrical connection end 3 facing the main board 15 by means of coating and curing or printing, so as to become a contact part 31 with a material hardness similar to that of the material of the electrical connection end 3.

[0060] By increasing the conductive medium (contact part 31), not only the electrical connection between the metal decorative plate 2 and the circuit structure 4 is ensured to be stable, but also the wear problem between the titanium alloy and the circuit structure 4 can be improved. For example, conductive silver paste or nickel plating is transferred on the surface of the titanium alloy of the electrical connection end 3, so that the contact part 31 forms a nickel plating layer or a conductive silver paste curing layer. The material hardness of the nickel plating layer or the conductive silver paste curing layer is similar to that of the material of the circuit structure 4, thus effectively avoiding abrasion to the circuit structure 4. As Figure 4 shown, in this embodiment, there is a spring piece on the circuit structure 4, and after the metal decorative plate 2 is combined with the mounting opening 14 of the cover plate 13, the contact part 31 of the electrical connection end 3 passes through the mounting opening 14 and contacts the spring piece. In this way, the metal decorative plate 2 can be electrically connected to the circuit structure 4.

[0061] In addition to adding a conductive medium layer on the electrical connection end 3, a conductive part 32 can also be installed at the end of the electrical connection end 3, and the material hardness of the conductive part 32 is usually matched with that of the circuit structure. In an embodiment provided by the present application, the contact part 31 is the conductive part 32, and the conductive part 32 is provided with a first connection part, and the electrical connection end 3 is provided with a second connection part. The first connection part is cooperatively connected to the second connection part so that the conductive part 32 is connected to the electrical connection end 3. The electrical connection end 3 is connected to the circuit structure 4 (spring piece) through the conductive part 32, thus effectively avoiding abrasion of the circuit structure 4.

[0062] As Figures 5 to 7 shown, in an embodiment provided by the present application, the second connection part is a limiting groove, and the first connection part on the conductive part 32 is a convex block, and the convex block is fitted into the limiting groove. The conductive part 32 can be, but is not limited to, metals such as copper or copper alloy with high electrical conductivity and low hardness, and is made into a block shape, so as to abut between the limiting groove 5 and the circuit structure 4, or is fixed in the limiting groove 5 by means of welding or clamping.

[0063] In addition, to ensure a good contact effect between the contact portion 31 and the circuit structure 4, in some embodiments, in the projection direction of the limiting groove 5, the thickness of the conductive member 32 is greater than the depth of the limiting groove 5. In this way, when the conductive member 32 is disposed in the limiting groove 5, at least a part of it can be exposed from the end face of the electrical connection end 3, and the block design can ensure that after the contact portion 31 contacts the circuit structure 4, there is sufficient contact area, and the electrical connection end 3 and the circuit structure 4 can maintain an appropriate distance to avoid the titanium alloy from wearing the circuit structure 4.

[0064] Furthermore, the electrical connection end 3 on the metal decorative plate 2 can be a square columnar structure or a cylindrical structure. The shape of the conductive member 32 can be square, circular, or polygonal. For example, in a specific embodiment, the electrical connection end 3 is a cylindrical structure, the second connection portion on the connection end is a screw hole, the conductive member 32 is a flat head screw, and the first connection portion is a stud. The stud can be connected to the screw hole so that the conductive member 32 is disposed at the end of the electrical connection end 3, thereby avoiding the contact between the electrical connection end 3 of the titanium alloy structure and the circuit structure 4.

[0065] As Figure 8 shown, in some other embodiments of the present application, the limiting groove 5 on the electrical connection end 3 further includes an avoidance space 51. The avoidance space 51 is located on the side wall of the electrical connection end 3 and extends from the end of the electrical connection end 3 towards the starting end. The length of the avoidance space 51 is less than the length of the limiting groove, so that the limiting groove 5 and the avoidance space 51 form an L-shaped groove. The conductive member 32 further includes an extension section 321. The extension section 321 is bent and connected to one side of the convex block. The length of the extension end is less than the length of the convex block, and the appearance of the conductive member 32 is in a corresponding L shape. When the convex block on the conductive member 32 is connected to the limiting groove 5, the extension section 321 is disposed in the avoidance space 51, and there is a gap between the end of the extension section 321 and the bottom of the avoidance space 51. The width of the gap is equal to or slightly less than the length of the extension section 321.

[0066] Furthermore, when the conductive member 32 is disposed in the limiting groove, the convex block is fixed in the limiting groove and is disposed corresponding to the circuit structure 4 of the main board 15. The conductive member 32 can be welded in the limiting groove 5. For example, it is welded to the bottom of the limiting groove 5 through the convex block, or welded to the side wall surface of the avoidance space 51 through the extension section 321. In addition, the conductive member 32 can also be connected to the limiting groove through fasteners (such as screws, buckles, etc.). For example, a connection hole is provided on the extension section 321, and the fastener passes through the connection hole to connect the extension section 321 to the avoidance space 51, thereby also firmly connecting the conductive member 32 to the limiting groove.

[0067] It can be understood that the external dimensions of the conductive member 32 need to conform to the dimensions of the limiting groove 5 to ensure proper installation. In this embodiment, through the design of the extension section 321 extending into the avoidance space 51, the contact portion 31 can be limited. Therefore, the size of the bump can be adjusted according to actual needs without strictly corresponding to the size of the limiting groove 5, making the structural design of the bump more flexible. For example, the length of the bump can be less than the length of the limiting groove 5, and it only needs to reach the position where it contacts the elastic piece.

[0068] See Figure 9 , in an embodiment provided by the present application, the contact portion 31 of the electrical connection end 3 can also be an elastic sheet structure and includes a holding section 301 and an elastic arm 302. The holding section 301 is provided on the electrical connection end 3. One end of the elastic arm 302 is bent and connected to the holding section 301, and the other end extends away from the electrical connection end 3 and corresponds to the circuit structure 4 of the main board 15. The contact portion 31 can be, but is not limited to, an elastic piece made of a metal material such as copper or copper alloy. The holding section 301 can be fixed to the end face of the electrical connection end 3 by welding or by fasteners, and the elastic arm 302 extends obliquely away from the electrical connection end 3, so that the elastic arm 302 can elastically contract by the elasticity of the material itself when contacting the circuit structure 4 of the main board 15. It should be noted that the circuit structure 4 referred to in this embodiment is a partial area on the top surface of the main board 15, and the elastic arm 302 of the contact portion 31 directly contacts the top surface of the main board 15 with its end, and the contact area is relatively small, which can reduce the wear of the circuit structure 4. For this situation, the circuit structure 4 can be a printed circuit on the main board 15, and the end of the elastic arm 302 directly contacts the printed circuit, and there is no need to provide the conductive elastic member described above on the printed circuit.

[0069] See Figure 10 and Figure 11 , in an embodiment provided by the present application, the rear cover assembly 11 further includes an inner lining plate 6. The cover plate 13 has opposite outer wall surfaces 131 and inner wall surfaces 132, and the inner lining plate 6 is provided on the metal decorative plate 2 or the inner wall surface 132 of the cover plate 13. For example, in Figure 10 , the inner lining plate 6 is connected to the inner wall surface 132 of the cover plate 13, and then the metal decorative plate 2 can be combined and connected with the inner lining plate 6. For another example, as shown in Figure 2 , the inner lining plate 6 is combined and connected with the metal decorative plate 2 to form an assembly, and then the assembly is fitted and connected to the installation opening 14 on the cover plate 13. In the technical solution provided by the present application, the inner lining plate 6 can be made of a metal material or a plastic material. Usually, in order to reduce the overall weight of the rear cover assembly 11, the plastic inner lining plate 6 better meets the usage requirements.

[0070] In addition, to facilitate the connection between the electrical connection terminals 3 on the metal decorative plate 2 and the circuit structure 4 on the main board 15, a through hole 61 is provided on the inner lining plate 6. When the metal decorative plate 2 is combined with the outer wall surface 131 of the cover plate 13, the electrical connection terminals 3 of the metal decorative plate 2 pass through the through hole 61 and extend towards the inner wall surface 132 of the cover plate 13. Thus, when the cover plate 13 is combined with the main body of the electronic device, the electrical connection terminals 3 can be connected to the circuit structure 4 on the main board 15.

[0071] Further, refer to Figure 10 and Figure 11 On the side of the inner lining plate 6 facing the metal decorative plate 2, an electrical connector 7 is provided, and the end of the electrical connector 7 is connected to the metal decorative plate 2. In addition, a carving structure 8 is provided on a partial surface of the metal decorative plate 2 corresponding to the electrical connector 7, and the electrical connector 7 of the inner lining plate 6 contacts the carving structure 8. For example, the electrical connector 7 of the inner lining plate 6 can be a metal spring piece made of a metal material such as copper or copper alloy, and a rough surface or a non-planar structure with unevenness is formed on the partial surface of the metal decorative plate 2 corresponding to the electrical connector 7 by laser carving to reduce the contact area between the electrical connector 7 and the metal decorative plate 2. Therefore, through the above structural design, not only can the grounding connection be achieved, but also the wear of the titanium alloy material of the metal decorative plate 2 on the electrical connector 7 can be reduced.

[0072] Refer to Figures 1 to 4 In an embodiment of the present application, a metal decorative plate 2 is further provided. The metal decorative plate 2 can be applied to the rear cover of an electronic device. The metal decorative plate 2 includes a plate body and electrical connection terminals 3. The plate body has an inner surface and an outer surface arranged opposite to each other. The electrical connection terminals 3 are provided on the inner surface of the plate body and extend in a direction away from the plate body. Among them, a contact portion 31 is provided at the end of the electrical connection terminal 3 for connecting to the circuit structure 4 on the electronic device. The material hardness of the contact portion 31 is different from that of the plate body, and the material hardness of the contact portion 31 is matched with the material hardness of the circuit structure 4. The metal decorative plate 2 can be a decorative member of the camera module of the electronic device mentioned above, or a decorative member on the rear cover of the electronic device. For the specific structure of the metal decorative plate 2, reference can be made to the description above, and details will not be repeated here.

[0073] Refer to Figure 1 In an embodiment of the present application, an electronic device is further provided. The electronic device includes a device body and the metal decorative plate 2 described above. The device body includes a main body 12 and a rear cover, and the rear cover is detachably connected to the main body 12. The metal decorative plate 2 is connected to the rear cover, and there is still a main board 15 in the main body 12. The contact portion 31 is connected to the circuit structure 4 on the main board 15. For example, refer to Figures 1 to 3 The electronic device is a smart phone, the rear cover is the battery cover plate of the smart phone, and the metal decorative plate 2 is a decorative member of the camera module on the rear cover.

[0074] In summary, in the technical solution provided by the present application, by using titanium alloy as the material of the metal decorative plate 2, not only can the electronic device have the lightweight characteristics of titanium alloy, effectively reducing the overall weight of the electronic device, but also the overall strength is improved. In addition, the material hardness of the contact portion 31 on the metal decorative plate 2 matches the material hardness of the circuit structure 4. When the two are in contact, not only can a good electrical connection effect between the metal decorative plate 2 and the main board 15 be ensured, but also the wear problem of the circuit structure 4 can be improved.

[0075] The above are only the embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A rear cover assembly, characterized in that, it is adapted to be combined with the body of an electronic device, and a main board is provided in the body. The rear cover assembly includes: a cover plate, detachably connected to the body, and an installation opening is provided on the cover plate; a metal decorative plate, connected to the installation opening, and provided with at least one electrical connection end extending towards the main board. A contact portion is provided at the end of the electrical connection end for connecting with a circuit structure on the main board; wherein, the material hardness of the contact portion is different from that of the metal decorative plate, and the material hardness of the contact portion matches that of the circuit structure.

2. The rear cover assembly according to claim 1, characterized in that, the circuit structure is a ground terminal or a feeding terminal; when the circuit structure is a ground terminal, it is used to connect the metal decorative plate to the ground circuit on the main board; when the circuit structure is a feeding terminal, it is used to output signal current to the metal decorative plate.

3. The rear cover assembly according to claim 2, characterized in that, the circuit structure further includes a conductive elastic sheet, and the conductive elastic sheet is elastically connected to the contact portion.

4. The rear cover assembly according to claim 3, characterized in that, the contact portion is a conductive material plating layer, a conductive material curing layer or a conductive composite material layer.

5. The rear cover assembly according to claim 4, characterized in that, the composition material of the metal decorative plate is titanium metal or titanium alloy, and the contact portion is a nickel plating layer or a conductive silver paste curing layer.

6. The rear cover assembly according to claim 3, characterized in that, the contact portion is a conductive member, a first connection portion is provided on the conductive member, and a second connection portion is provided on the electrical connection end; the first connection portion is cooperatively connected to the second connection portion to connect the conductive member to the electrical connection end.

7. The rear cover assembly according to claim 6, characterized in that, the second connection portion is a limiting groove, the first connection portion is a convex block, and the convex block is fitted into the limiting groove; the thickness of the convex block is greater than the depth of the limiting groove.

8. The rear cover assembly according to claim 7, characterized in that, the limiting groove further includes an avoidance space, and the avoidance space is located on the side wall of the electrical connection end; the convex block further includes an extension section, and the extension section is bent and connected to one side of the convex block; when the convex block is connected to the limiting groove, the extension section is arranged in the avoidance space.

9. The rear cover assembly according to claim 2, characterized in that, the contact portion further includes a holding section and an elastic arm; the holding section is arranged on the electrical connection end, one end of the elastic arm is bent and connected to the holding section, and the other end extends towards the side away from the electrical connection end and is arranged corresponding to the circuit structure.

10. The rear cover assembly according to claim 1, characterized in that, it further includes an inner lining plate, arranged on the metal decorative plate or the inner wall surface of the cover plate, and a through hole is provided on the inner lining plate; when the metal decorative plate is combined with the outer wall surface of the cover plate, the electrical connection end passes through the through hole and extends towards the inner wall surface of the cover plate; An electrical connector is provided on one side of the inner lining plate facing the metal decorative plate, and the end of the electrical connector is connected to the metal decorative plate.

11. The rear cover assembly according to claim 10, wherein, the electrical connector is a metal elastic member, a carving structure is provided on a partial surface of the metal decorative plate corresponding to the metal elastic member, and the metal elastic member contacts the carving structure.

12. A metal decorative plate, wherein, it can be applied to the rear cover of an electronic device, and includes: a plate body; an electrical connection end, which is provided on the inner surface of the plate body and extends away from the plate body; wherein, a contact portion is provided at the end of the electrical connection end for connecting with a circuit structure on the electronic device; the material hardness of the contact portion is different from that of the plate body, and the material hardness of the contact portion matches that of the circuit structure.

13. An electronic device, wherein, it includes a device body and the metal decorative plate according to claim 12, the device includes a main body and a rear cover, and the rear cover is detachably connected to the main body; the metal decorative plate is connected to the rear cover, a main board is further provided in the main body, and the contact portion is connected to the circuit structure on the main board.

14. An electronic device, wherein, it includes a main body and the rear cover assembly according to any one of claims 1 to 11, and the rear cover assembly is detachably connected to the main body.

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