Circuit board assembly and electronic device

Abstract

The application discloses a circuit board assembly and an electronic device, which comprise a support, a circuit board, a metal sheet and a first fastener. The support is provided with a first support structure, the first support structure is provided with a first mounting hole, and a metal nut is arranged in the first mounting hole. The circuit board is provided with a third through hole. The metal sheet is arranged between the first support structure and the circuit board, and the metal sheet is provided with a first through hole. The first fastener is sequentially arranged in the third through hole, the first through hole and the first mounting hole, and is connected with the metal nut. Through the connection of the first fastener and the metal nut, when the first support structure is melted due to high temperature caused by the contact of the metal sheet and the circuit board, the metal nut and the first fastener can still make the metal sheet and the circuit board contact well, the contact stability of the metal sheet and the circuit board is enhanced, and the influence of high temperature on the shielding function of the metal sheet is reduced.

Description

Technical Field

[0001] This application relates to the field of electronic equipment technology, and more particularly to a circuit board assembly and an electronic device. Background Technology

[0002] Circuit board shielding is a common design requirement in electronic products, usually achieved by adding a metal plate. In circuit board design, when size is limited, the conductive function of the shielding plate is utilized to facilitate circuit board jumper designs. Related technologies typically use materials such as plastic to connect the metal shielding plate. However, the contact resistance at the interface between the circuit board and the metal shielding plate generates heat. If excessive heat is generated, the plastic may melt, causing unstable contact between the metal shielding plate and the circuit board. Utility Model Content

[0003] This application aims to provide a circuit board assembly and electronic device that improves the contact stability between the metal shielding plate and the circuit.

[0004] In a first aspect, this application proposes a circuit board assembly, including a bracket, a circuit board, a metal sheet, and a first fastener. The bracket has a first support structure with a first mounting hole, and a metal nut is disposed within the first mounting hole. The circuit board is mounted on the bracket and has a third through hole communicating with the first mounting hole. The metal sheet is disposed between the first support structure and the circuit board, and has a first through hole communicating with both the first mounting hole and the third through hole. The first fastener is sequentially inserted through the third through hole, the first through hole, and the first mounting hole, and is threadedly connected to the metal nut.

[0005] In the above scheme, the first support structure of the bracket provides physical support for the circuit board. A first mounting hole is opened in the first support structure, and a metal nut is placed in the first mounting hole. A first through hole and a third through hole are opened on the metal sheet and the circuit board, respectively. A first fastener passes through the third through hole, the first through hole, and the first mounting hole, and finally the first fastener is connected to the metal nut. In this way, the circuit board is stably mounted on the bracket, and the metal sheet is tightly clamped between the circuit board and the bracket, and in close contact with the circuit board. In this design, the contact between the metal sheet and the circuit board can form a protective space on the circuit board locally. As a good conductor, when external electromagnetic waves reach the surface of the metal sheet, they will be reflected by the metal surface, reducing interference to the circuit board. Some electromagnetic waves that penetrate the surface of the metal sheet will be converted into heat energy and consumed inside the metal due to eddy current loss and hysteresis loss, further weakening the energy and reducing interference. By forming a protective space, reflecting external interfering electromagnetic waves, and absorbing electromagnetic radiation, the circuit board is effectively protected and the interference received by the circuit board is reduced. Furthermore, even when the metal sheet and the circuit board generate high temperatures upon contact, causing the first support structure to melt due to the high temperature, the metal nut and the first fastener can still ensure good contact between the metal sheet and the circuit board, enhancing the stability of the bonding contact between the metal sheet and the circuit board and reducing the impact of high temperature on the shielding function of the metal sheet.

[0006] In some embodiments, the circuit board assembly includes a metal plate disposed between a support and a circuit board. The metal sheet includes a first metal sheet portion and a second metal sheet portion. The first metal sheet portion is connected to the metal plate and extends toward the circuit board. The second metal sheet portion is connected to the end of the first metal sheet portion away from the metal plate, bent in a direction parallel to the circuit board, and abuts against the circuit board. The metal plate is positioned, and the metal sheet is placed on the metal plate, then bent to contact the circuit board. This configuration allows multiple metal sheets to be arranged on the metal plate, thereby providing shielding protection for multiple parts of the circuit board. When multiple metal sheets need to be electrically connected to other parts, the metal plate can be conductive as a whole, simplifying the connection process of multiple metal sheets. Furthermore, as a larger area metal material, the metal plate significantly enhances its ability to absorb electromagnetic waves, helping to reduce interference from external electromagnetic waves to the circuit board.

[0007] In some embodiments, the bracket further includes a second support structure with a second mounting hole. A second through hole is formed in the metal plate, communicating with the second mounting hole. The second support structure passes through the second through hole and supports the circuit board. The circuit board assembly also includes a second fastener, which passes sequentially through the third through hole and the second mounting hole, thus fixing the bracket to the circuit board. By providing a second support structure to the bracket and having a second through hole in the metal plate to avoid the second support structure, and fixing the second support structure to the circuit board using the second fastener, the support points for the circuit board are increased, improving the connection stability between the circuit board and the bracket, and enhancing the stability of the contact between the metal sheet and the circuit board.

[0008] In some embodiments, the outer surface of the metal nut is provided with external threads, and the inner surface of the first mounting hole is provided with a plurality of fitting portions, the fitting portions being at least partially embedded in the external threads. The external threads on the outer surface of the metal nut and the fitting portions within the first mounting hole, where the external threads mate with the fitting portions, increase the friction between the first mounting hole and the metal nut, resulting in a stronger connection between the first support structure and the metal nut, thus improving the connection stability of the metal nut.

[0009] In some embodiments, the external thread includes a first threaded portion and a second threaded portion, which are sequentially arranged along the axial direction of the metal nut. The first threaded portion is inclined toward the opening of the first mounting hole, and the second threaded portion is inclined away from the opening of the first mounting hole. By providing two threaded portions with different inclination directions on the external thread of the metal nut, the first support structure can generate resistance in different directions against the metal nut. This resistance in different directions can reduce the displacement of the metal nut in different directions, thus improving the connection stability of the metal nut.

[0010] In some embodiments, a first groove is provided on the outer surface of the metal nut, and the first groove is located between the first threaded portion and the second threaded portion along the axial direction of the metal nut. Providing the first groove on the outer surface of the metal nut and positioning it between the first threaded portion and the second threaded portion can reduce interference and collision caused by high-temperature expansion of the first and second threaded portions, thus improving the structural stability of the metal nut itself. It is understood that the first groove is provided around the outer surface of the metal nut.

[0011] In some embodiments, a support wall is provided around the outer surface of the bracket, and a protrusion is provided on the surface of the support wall facing the circuit board, the protrusion supporting the circuit board. The support wall surrounding the outer surface of the bracket not only provides protection for the internal structure of the bracket but also distributes the pressure of the circuit board on the first support structure. Protruding portions on the surface of the support wall supporting the circuit board further enhance the support capacity of the support wall for the circuit board, which is beneficial for improving the connection stability between the circuit board and the bracket.

[0012] In some embodiments, the outer surface of the second support structure is provided with reinforcing ribs. Providing reinforcing ribs on the outer surface of the second support structure can enhance its structural strength, reduce deformation or cracking, and improve the stability of the support for the circuit board.

[0013] In some embodiments, the end of the second metal sheet portion away from the first metal sheet portion is chamfered. Chamfering the second metal sheet portion reduces scratching and wear on the circuit board during assembly.

[0014] In this application, a metal nut is disposed within a first mounting hole in the first support structure, and the first fastener directly engages with the metal nut rather than directly connecting to the first support structure. When the metal sheet performs its shielding function, the contact with the circuit board and the absorption of electromagnetic waves generate heat, which is transferred to the first support structure, causing it to melt. At this time, the metal nut, being a high-temperature resistant metal, is less affected by the high temperature, and the metal nut and the first fastener can still provide support for the metal sheet. This ensures that the shielding effect of the metal sheet on the circuit board remains stable, which helps to reduce the impact of high temperatures on the shielding function of the metal sheet.

[0015] Secondly, this application provides an electronic device including a circuit board assembly according to any embodiment of the first aspect.

[0016] Additional aspects and advantages of the embodiments of this application will be described, shown, or illustrated in part by way of implementation of the embodiments of this application in the following description. Attached Figure Description

[0017] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are not intended to limit the embodiments, and elements having the same reference numerals in the drawings are designated as similar elements.

[0018] Figure 1 Exploded views of circuit board assemblies according to some embodiments of this application; Figure 2 This is a partial structural cross-sectional view of a circuit board assembly according to some embodiments of this application; Figure 3 This is a partial structural cross-sectional view of a circuit board assembly according to some embodiments of this application; Figure 4 This is a partial structural schematic diagram of a circuit board assembly according to some embodiments of this application; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6This is a schematic diagram of the structure of the bracket according to some embodiments of this application; Figure 7 This is a schematic diagram of the structure of a metal nut according to some embodiments of this application; Figure 8 This is a partial structural cross-sectional view of a circuit board assembly according to some embodiments of this application at high temperature.

[0019] Explanation of reference numerals in the attached drawings: 1. Bracket; 11. First support structure; 111. First mounting hole; 112. Fitting part; 12. Second support structure; 121. Second mounting hole; 122. Reinforcing rib; 13. Support wall; 131. Protrusion; 2. Circuit board; 21. Third through hole; 3. Metal sheet; 31. First through hole; 32. First metal sheet portion; 33. Second metal sheet portion; 331. Chamfer; 41. First fastener; 42. Second fastener; 5. Metal nut; 51. External thread; 511. First threaded portion; 512. Second threaded portion; 52. First groove; 6. Metal plate; 61. Second through hole. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0021] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0022] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0023] The technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0024] Firstly, this application proposes a circuit board assembly, please refer to... Figure 1 It includes a bracket 1, a circuit board 2, a metal sheet 3, and a first fastener 41.

[0025] For the aforementioned bracket 1, bracket 1 provides a relatively stable main support structure for circuit board 2 and needs to have a certain structural strength, which can be designed according to modal stiffness requirements. Under normal circumstances, bracket 1 needs to have insulation to reduce short circuits of components on circuit board 2. Therefore, the material of bracket 1 can be plastic, such as PC (polycarbonate), PA (polyamide), or ABS (acrylonitrile-butadiene-styrene copolymer), etc., and the surface of bracket 1 can be treated to reduce flash and reduce scratches and wear on circuit board 2.

[0026] The aforementioned circuit board 2 serves as a carrier for various components and requires a certain structural strength to minimize deformation or breakage during use. Furthermore, these components typically generate heat during operation, and the circuit board 2 can be designed for heat dissipation, such as by incorporating copper heat dissipation zones or heat dissipation vias.

[0027] For the aforementioned metal sheet 3, and for the circuit board 2 requiring shielding, the metal sheet 3, as a good conductor, reflects external electromagnetic waves upon reaching its surface, reducing interference to the circuit board 2. Electromagnetic waves that partially penetrate the surface of the metal sheet 3 are converted into heat energy within the metal due to eddy current losses and hysteresis losses, further weakening the energy and reducing interference. Typically, grounding the metal sheet 3 allows reflected or absorbed electromagnetic clutter to be conducted to the ground through a grounding path, reducing the accumulation of electromagnetic waves within the metal sheet 3 and the formation of secondary radiation.

[0028] For the first fastener 41 mentioned above, commonly used threaded fasteners such as screws, bolts, and studs can be selected. To reduce the load on the bracket 1, lightweight screws can be used as fasteners.

[0029] Please refer to Figures 1 to 3The bracket 1 is provided with a first support structure 11, which has a first mounting hole 111. A metal nut 5 is disposed in the first mounting hole 111. The metal nut 5 can be placed in the mold in which the bracket 1 is formed, so that the metal nut 5 is embedded in it when the bracket 1 is melted and formed. Alternatively, after the bracket 1 is formed, the metal nut 5 can be heated, and the high temperature of the metal nut 5 melts the inner surface of the first mounting hole 111, allowing it to be embedded after solidification. A circuit board 2 is disposed on the bracket 1, and a third through hole 21 is provided on the circuit board 2, which communicates with the first mounting hole 111. It is understood that the number and position of the first mounting hole 111 and the third through hole 21 can be set according to the actual needs of the circuit board 2. A metal sheet 3 is disposed between the first support structure 11 and the circuit board 2, and the metal sheet 3 has a first through hole 31, which communicates with both the first mounting hole 111 and the third through hole 21. Understandably, the number and position of the metal sheets 3 are related to the parts of the circuit board 2 that need to provide shielding. The first fastener 41 is sequentially inserted into the third through hole 21, the first through hole 31 and the first mounting hole 111, and the first fastener 41 is threadedly connected to the metal nut 5.

[0030] In the above scheme, the first support structure 11 of the bracket 1 provides physical support for the circuit board 2. A first mounting hole 111 is formed in the first support structure 11, and a metal nut 5 is placed in the first mounting hole 111. A first through hole 31 and a third through hole 21 are formed on the metal sheet 3 and the circuit board 2, respectively. A first fastener 41 passes through the third through hole 21, the first through hole 31, and the first mounting hole 111, and finally the first fastener 41 is connected to the metal nut 5. In this way, the circuit board 2 is stably set on the bracket 1, and the metal sheet 3 is tightly clamped between the circuit board 2 and the bracket 1 and in close contact with the circuit board 2. This design can effectively protect the circuit board 2 and reduce the interference to the circuit board 2 by forming a protective space, reflecting external interference electromagnetic waves, and absorbing electromagnetic radiation. Furthermore, even when the metal sheet 3 and the circuit board 2 come into contact with high temperatures, causing the first support structure 11 to melt due to the high temperature, the metal nut 5 and the first fastener 41 can still ensure good contact between the metal sheet 3 and the circuit board 2, thereby enhancing the stability of the contact between the metal sheet 3 and the circuit board 2 and reducing the impact of high temperature on the shielding function of the metal sheet 3.

[0031] In some embodiments, please refer to Figure 4 and Figure 5The circuit board assembly includes a metal plate 6 disposed between the bracket 1 and the circuit board 2. The metal sheet 3 includes a first metal sheet portion 32 and a second metal sheet portion 33. The first metal sheet portion 32 is connected to the metal plate 6 and extends towards the circuit board 2. The second metal sheet portion 33 is connected to the end of the first metal sheet portion 32 away from the metal plate 6. The second metal sheet portion 33 is bent in a direction parallel to the circuit board 2 and is in contact with the circuit board 2. The metal plate 6 is set, and the metal sheet 3 is placed on the metal plate 6, contacting the circuit board 2 by bending the metal sheet 3. This arrangement allows for multiple metal sheets 3 to be placed on the metal plate 6, providing shielding protection for multiple parts of the circuit board 2. When multiple metal sheets 3 need to be connected to other parts for conduction, such as grounding or other possible electrical connections, connecting multiple metal sheets 3 separately is inconvenient. The metal plate 6 can be used as a whole for conduction, making it more convenient to connect and conduct multiple metal sheets 3. Furthermore, as a larger metal material, the metal plate 6 has a greater ability to absorb electromagnetic waves, which helps to reduce the interference of external electromagnetic waves on the circuit board 2.

[0032] In some embodiments, please refer to Figure 1 and Figure 6 The bracket 1 is also provided with a second support structure 12, which has a second mounting hole 121. The metal plate 6 has a second through hole 61, which communicates with the second mounting hole 121. The second support structure 12 passes through the second through hole 61 and supports the circuit board 2. The circuit board assembly also includes a second fastener 42, which passes through the third through hole 21 and the second mounting hole 121 in sequence, so that the bracket 1 and the circuit board 2 are fixed together. By providing the second support structure 12 on the bracket 1 and opening the second through hole 61 on the metal plate 6 to avoid the second support structure 12, the second support structure 12 is fixed to the circuit board 2 by the second fastener 42. This increases the support points of the bracket 1 for the circuit board 2, improves the connection stability between the circuit board 2 and the bracket 1, and helps to improve the stability of the contact between the metal sheet 3 and the circuit board 2.

[0033] In some embodiments, please refer to Figure 2 and Figure 7The outer surface of the metal nut 5 is provided with an external thread 51, and the inner surface of the first mounting hole 111 is provided with a plurality of fitting portions 112, each fitting portion 112 being at least partially embedded in the external thread 51. The external thread 51 on the outer surface of the metal nut 5 and the fitting portions 112 within the first mounting hole 111, where the external thread 51 mates with the fitting portions 112, increase the friction between the first mounting hole 111 and the metal nut 5, resulting in a stronger connection between the first support structure 11 and the metal nut 5, thus improving the connection stability of the metal nut 5. It should be noted that the fitting portions 112 within the first mounting hole 111 can be threads, or they can be portions of the first support structure 11 that have solidified after melting and flowing into the spaces between the teeth of the external thread 51.

[0034] In some embodiments, please refer to Figure 7 The external thread 51 includes a first threaded portion 511 and a second threaded portion 512, which are sequentially arranged along the axial direction of the metal nut 5. The first threaded portion 511 is inclined toward the opening of the first mounting hole 111, and the second threaded portion 512 is inclined away from the opening of the first mounting hole 111. By providing two threaded portions with different inclination directions on the external thread 51 of the metal nut 5, the first support structure 11 can generate resistance in different directions on the metal nut 5. This resistance in different directions can reduce the displacement of the metal nut 5 in different directions, which is beneficial to improving the connection stability of the metal nut 5.

[0035] In some embodiments, please refer to Figure 7 A first groove 52 is provided on the outer surface of the metal nut 5. Along the axial direction of the metal nut 5, the first groove 52 is located between the first threaded portion 511 and the second threaded portion 512. Providing the first groove 52 on the outer surface of the metal nut 5 and positioning it between the first threaded portion 511 and the second threaded portion 512 can reduce interference and collision caused by high-temperature expansion of the first threaded portion 511 and the second threaded portion 512, thus improving the structural stability of the metal nut 5. It can be understood that the first groove 52 is provided around the outer surface of the metal nut 5.

[0036] In some embodiments, please refer to Figure 6 A support wall 13 is provided around the outer surface of the bracket 1. A protrusion 131 protrudes from the surface of the support wall 13 facing the circuit board 2, supporting the circuit board 2. The support wall 13 not only protects the internal structure of the bracket 1 but also distributes the pressure exerted by the circuit board 2 on the first support structure 11. The protrusion 131 on the surface of the support wall 13 further enhances its support capacity for the circuit board 2, thus improving the connection stability between the circuit board 2 and the bracket 1.

[0037] In some embodiments, please refer to Figure 6 The outer surface of the second support structure 12 is provided with reinforcing ribs 122. The reinforcing ribs 122 on the outer surface of the second support structure 12 can enhance the structural strength of the second support structure 12, reduce the deformation or cracking of the second support structure 12, and help improve the stability of the bracket 1 supporting the circuit board 2.

[0038] In some embodiments, please refer to Figure 5 The second metal sheet portion 33 has a chamfer 331 at the end away from the first metal sheet portion 32. The chamfer 331 on the second metal sheet portion 33 of the metal sheet 3 reduces scratching and wear on the circuit board 2 during the assembly process between the metal sheet 3 and the circuit board 2.

[0039] Please refer to the following in this application: Figure 3 and Figure 8 The metal nut 5 is disposed in the first mounting hole 111 of the first support structure 11. The first fastener 41 is directly connected to the metal nut 5, but not directly connected to the first support structure 11. When the metal sheet 3 performs its shielding function, the contact with the circuit board 2 and the absorption of electromagnetic waves generate heat. The high temperature is transferred to the first support structure 11, causing the first support structure 11 to melt. At this time, the metal nut 5, as a high-temperature resistant metal, is less affected by the high temperature. The metal nut 5 and the first fastener 41 can still provide support for the metal sheet 3, thus ensuring that the shielding effect of the metal sheet 3 on the circuit board 2 remains stable, which helps to reduce the impact of high temperature on the shielding function of the metal sheet 3.

[0040] Secondly, this application provides an electronic device including a circuit board assembly according to any embodiment of the first aspect.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above, which are not provided in detail for the sake of brevity; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A circuit board assembly, characterized in that, include; The bracket is provided with a first support structure, the first support structure has a first mounting hole, and a metal nut is provided in the first mounting hole; A circuit board is mounted on the bracket, and a third through hole is provided on the circuit board, which communicates with the first mounting hole; A metal sheet is disposed between the first support structure and the circuit board. The metal sheet has a first through hole, which communicates with the first mounting hole and the third through hole. The first fastener is sequentially inserted into the third through hole, the first through hole, and the first mounting hole, and is threadedly connected to the metal nut.

2. The circuit board assembly according to claim 1, characterized in that, The circuit board assembly includes a metal plate disposed between the bracket and the circuit board; The metal sheet includes a first metal sheet portion and a second metal sheet portion. The first metal sheet portion is connected to the metal plate and extends toward the circuit board. The second metal sheet portion is connected to the end of the first metal sheet portion away from the metal plate. The second metal sheet portion is bent in a direction parallel to the circuit board and is attached to the circuit board.

3. The circuit board assembly according to claim 2, characterized in that, The bracket is also provided with a second support structure, the second support structure having a second mounting hole, the metal plate having a second through hole, the second through hole communicating with the second mounting hole; the second support structure passes through the second through hole and supports the circuit board; The circuit board assembly further includes a second fastener, which is sequentially inserted through the third through hole and the second mounting hole, thereby fixing the bracket to the circuit board.

4. The circuit board assembly according to claim 1, characterized in that, The outer surface of the metal nut is provided with an external thread, and the inner surface of the first mounting hole is provided with a plurality of fitting portions, wherein the fitting portions are at least partially embedded in the external thread.

5. The circuit board assembly according to claim 4, characterized in that, The external thread includes a first threaded portion and a second threaded portion, which are arranged sequentially along the axial direction of the metal nut. The first threaded portion is inclined toward the opening of the first mounting hole, and the second threaded portion is inclined away from the opening of the first mounting hole.

6. The circuit board assembly according to claim 5, characterized in that, The outer surface of the metal nut is provided with a first groove, which is located between the first threaded portion and the second threaded portion along the axial direction of the metal nut.

7. The circuit board assembly according to claim 1, characterized in that, The outer surface of the bracket is surrounded by a support wall, and the surface of the support wall facing the circuit board has a protrusion that supports the circuit board.

8. The circuit board assembly according to claim 3, characterized in that, The outer surface of the second support structure is provided with reinforcing ribs.

9. The circuit board assembly according to claim 2, characterized in that, The end of the second metal sheet portion away from the first metal sheet portion has a chamfer.

10. An electronic device, characterized in that, Includes the circuit board assembly as claimed in any one of claims 1 to 9.

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