CN219459665U - Electromagnetic shielding structure and printed circuit board assembly - Google Patents
Electromagnetic shielding structure and printed circuit board assembly Download PDFInfo
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- CN219459665U CN219459665U CN202320374600.9U CN202320374600U CN219459665U CN 219459665 U CN219459665 U CN 219459665U CN 202320374600 U CN202320374600 U CN 202320374600U CN 219459665 U CN219459665 U CN 219459665U
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Abstract
The utility model relates to an electromagnetic shield structure and printed circuit board assembly, wherein, electromagnetic shield structure includes printed circuit board, a plurality of elasticity conductive piece, a plurality of conductive point and shield cover, the printed circuit board includes that electronic components sets up the region, elasticity conductive piece with the conductive point is fixed in on the printed circuit board, and around electronic components sets up regional interval ground layout, elasticity conductive piece with conductive point all with the interference fit of shield cover. The technical scheme can improve the electromagnetic compatibility of the electronic equipment and is convenient to assemble and disassemble.
Description
Technical Field
The present disclosure relates to the field of electromagnetic shielding technologies, and in particular, to an electromagnetic shielding structure and a printed circuit board assembly.
Background
Conventionally, electronic devices such as mobile phones and computers are easily affected by noise such as electromagnetic waves from the main substrate and the outside due to miniaturization, high-speed processing, and the like. Accordingly, there is an increasing demand for printed circuit boards including shield cans having an electromagnetic shielding function.
Currently, the existing shielding cases generally adopt the following modes: firstly, welding a shielding cover on a printed circuit board, and disassembling the shielding cover if an electronic element needs to be overhauled, wherein the electronic element on the printed circuit board is easy to damage due to high disassembling difficulty, and even the printed circuit board is scrapped; secondly, the shield cover is fixed by bolts after being placed on the printed circuit board, and the connection part of the shield cover and the printed circuit board is not tightly connected due to the tolerance between the shield cover and the printed circuit board, so that electromagnetic leakage is caused, and the electromagnetic compatibility of the electronic equipment is reduced.
Disclosure of Invention
In order to solve the technical problems, the present disclosure provides an electromagnetic shielding structure and a printed circuit board assembly, so as to improve the problem of electromagnetic leakage, ensure a good shielding function of a shielding case, and improve electromagnetic compatibility of electronic equipment.
The utility model provides an electromagnetic shielding structure, including printed circuit board, a plurality of elasticity conductive piece, a plurality of conductive point and shield cover, the printed circuit board includes that electronic components sets up the region, elasticity conductive piece and the conductive point is fixed in on the printed circuit board, and around electronic components sets up regional interval ground layout, elasticity conductive piece and the conductive point all with the shield cover interference fit, elasticity conductive piece with the initial state's of conductive point height all is greater than the printed circuit board with the interval between the shield cover, and after interference fit the elasticity conductive piece with the height of conductive point all is less than the printed circuit board with the interval between the shield cover.
In the present disclosure, the printed circuit board further includes a connector setting area, and a part of the conductive points and all of the elastic conductive members are disposed at the periphery of the connector setting area.
In the present disclosure, at least one conductive point is disposed between two adjacent elastic conductive members.
In the present disclosure, the distance between two adjacent elastic conductive elements is less than or equal to 9mm.
In the present disclosure, the shielding case includes a plurality of grooves corresponding to the elastic conductive members, the elastic conductive members are disposed in the grooves, and the depth of the grooves is smaller than the longitudinal height of the elastic conductive members in a natural state.
In the present disclosure, along the arrangement direction of the elastic conductive element and the conductive point, the difference between the length of the groove and the length of the elastic conductive element is less than or equal to 2mm.
In the present disclosure, the elastic conductive member is an elastic member having conductive properties, or is an insulating elastic member having a conductive film layer coated on the surface.
In the present disclosure, the elastic modulus of the elastic conductive member is between 0.4Mpa and 20Mpa, the elastic modulus of the conductive point is between 250Mpa and 2000Mpa, and the elastic modulus of the conductive point is 100 to 500 times that of the elastic conductive member.
The height of the elastic conductive piece is 2 to 5 times of the distance between the printed circuit board and the shielding cover, and the height of the conductive point is 1.2 to 1.5 times of the distance between the printed circuit board and the shielding cover.
The present disclosure provides a printed circuit board assembly including an electronic component and the electromagnetic shielding structure provided by the present disclosure, the electronic component is disposed in an electronic component disposition area of the printed circuit board.
The present disclosure provides an electronic device including the printed circuit board assembly provided by the present disclosure.
Compared with the prior art, the technical scheme provided by the disclosure has the following advantages:
according to the technical scheme, the elastic conductive elements and the conductive points are distributed at intervals on the periphery of the electronic component arrangement area of the printed circuit board, and the elastic conductive elements, the conductive points and the shielding cover are in interference fit, so that after the shielding cover is connected with the printed circuit board, the elastic conductive elements can be compressed, good connection between the shielding cover and the printed circuit board is ensured by means of elasticity of the elastic conductive elements, namely, gaps are avoided in connection between the shielding cover and the printed circuit board at the elastic conductive elements; meanwhile, the conductive points are made of good ductility, so that the conductive points are pressed and then spread to the periphery, and gaps between the shielding cover and the printed circuit board can be effectively filled. So, this disclosed technical scheme is through setting up elasticity conductive piece and conductive point on printed circuit board, through elasticity conductive piece and conductive point and shield cover interference fit, can reduce the gap between shield cover and the printed circuit board greatly for the shield cover is connected with printed circuit board's is good, thereby has improved the problem of electromagnetic leakage, has guaranteed the good shielding function of shield cover, has promoted electronic equipment's electromagnetic compatibility. Meanwhile, the arrangement mode is convenient to assemble, saves the assembly space between the shielding cover and the printed circuit board, is convenient to detach when the printed circuit board needs to be overhauled, and is not easy to damage electronic components in the detaching process.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of an electromagnetic shielding structure provided in an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an elastic conductive element and a conductive point when the elastic conductive element and the conductive point are in interference fit with a shielding case according to an embodiment of the disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.
Fig. 1 is a schematic structural diagram of an electromagnetic shielding structure provided by an embodiment of the disclosure, and fig. 2 is a schematic structural diagram of an elastic conductive member and a conductive point when the conductive point is in interference fit with a shielding case provided by an embodiment of the disclosure. As shown in fig. 1 and 2, the electromagnetic shielding structure includes a printed circuit board 1, a plurality of elastic conductive members 2, a plurality of conductive points 3 and a shielding case 4, the printed circuit board 1 includes an electronic component setting area 11, the elastic conductive members 2 and the conductive points 3 are fixed on the printed circuit board 1 and are distributed around the electronic component setting area 11 at intervals, the elastic conductive members 2 and the conductive points 3 are in interference fit with the shielding case 4, the heights of the elastic conductive members 2 and the conductive points 3 in the initial state are larger than the interval between the printed circuit board 1 and the shielding case 4, and after interference fit, the heights of the elastic conductive members 2 and the conductive points 3 are smaller than the interval between the printed circuit board 1 and the shielding case 4.
In the embodiment of the present disclosure, the printed circuit board 1 is any circuit board that needs to be provided with a shielding function. The elastic conductive member 2 has good elasticity, and may be an elastic member having conductive property, or an insulating elastic member coated with a conductive film layer on the surface. The conductive dots 3 may be made of a metal having good conductivity and ductility, and may be formed on the printed circuit board 1 in the form of solder joints. The shield 4 is typically a metallic structural member.
In the electromagnetic shielding structure, since the elastic conductive member 2 has elasticity, and the elastic conductive member 2 and the shielding case 4 are arranged in an interference fit, after the shielding case 4 is assembled on the printed circuit board 1, the elastic conductive member 2 is compressed by the pressing of the shielding case 4 and the printed circuit board 1, so that the shielding case 4 and the elastic conductive member 2, and the printed circuit board 1 and the elastic conductive member 2 are tightly attached at the elastic conductive member 2, and the elastic conductive member 2 has conductivity, so that the elastic conductive member 2 can be regarded as a part of the shielding case 4, and therefore, at the elastic conductive member 2, the joint of the shielding case 4 and the printed circuit board 1 is seamless. Meanwhile, the conductive points 3 are made of good ductility, and the conductive points 3 and the shielding cover 4 are in interference fit, so that after the shielding cover 4 is assembled on the printed circuit board 1, the conductive points 3 are extruded by the shielding cover 4 and the printed circuit board 1 to extend to the periphery, and gaps at the connection positions of the shielding cover 4 and the printed circuit board 1 near the conductive points 3 can be effectively filled. Thus, with the electromagnetic shielding structure, the gap at the connection part of the shielding cover 4 and the printed circuit board 1 caused by product tolerance can be greatly reduced with lower cost, so that the problem of electromagnetic leakage is improved. In addition, this mode of setting is convenient for assemble, saves the assembly space between shield cover 4 and the printed circuit board 1, and dismantles conveniently when the printed circuit board needs to be overhauld, is difficult for damaging electronic components in the dismantlement process.
According to the electromagnetic shielding structure provided by the embodiment of the disclosure, the elastic conductive elements and the conductive points are distributed at intervals on the periphery of the electronic component arrangement area of the printed circuit board, and the elastic conductive elements, the conductive points and the shielding cover are in interference fit, so that after the shielding cover is connected with the printed circuit board, the elastic conductive elements are compressed, good connection between the shielding cover and the printed circuit board is ensured by means of elasticity of the elastic conductive elements, namely, gaps are avoided in connection between the shielding cover and the printed circuit board at the elastic conductive elements; meanwhile, the conductive points have good ductility, so that the conductive points extend to the periphery after being pressed, and gaps between the shielding cover and the printed circuit board can be effectively filled. So, this disclosed technical scheme is through setting up elasticity conductive piece and conductive point on printed circuit board, through elasticity conductive piece and conductive point and shield cover interference fit, can reduce the gap between shield cover and the printed circuit board greatly for the shield cover is connected with printed circuit board's is good, thereby has improved the problem of electromagnetic leakage, has guaranteed the good shielding function of shield cover, has promoted electronic equipment's electromagnetic compatibility. And meanwhile, the assembly and the disassembly are convenient.
In some embodiments, referring to fig. 1, the printed circuit board 1 further includes a connector setting area 12, and a part of the conductive dots 3 and all of the elastic conductive elements 2 are disposed at the periphery of the connector setting area 12. In view of the fact that the face of the printed circuit board is more prone to irregularities in the vicinity of the connector on the printed circuit board, there may be larger and irregular gaps between the shield and the printed circuit board in the vicinity of the connector. In this regard, the elastic conductive member and the conductive points need to be disposed near the connector, and the connection reliability of the shield can and the printed circuit board near the connector can be effectively improved by combining the characteristics of the elastic conductive member and the conductive points, so as to reduce the connection gap. In addition, the other areas are provided with conductive points 3 which are arranged continuously and at intervals.
In some embodiments, at least one conductive point is disposed between two adjacent elastic conductive elements. Thus, gaps which cannot be filled near the elastic conductive elements can be filled by the conductive points, so that the elastic conductive elements are matched with the conductive points, and gaps between the shielding cover and the printed circuit board are further reduced. In some embodiments, the spacing between adjacent two elastic conductive elements is less than or equal to 9mm. When the distance between two adjacent elastic conductive pieces is smaller than or equal to 9mm, the gap between the shielding cover and the printed circuit board can be ensured to be small enough, and electromagnetic interference can be ignored.
In some embodiments, referring to fig. 2 (conductive points are not shown because they are substantially flattened due to their good ductility), the shield 4 includes a plurality of grooves 41 corresponding to the elastic conductive members 2, the elastic conductive members 2 are disposed in the grooves 41, and the depth of the grooves 41 is smaller than the longitudinal height of the elastic conductive members 2 in a natural state. In this way, when the shield case 4 is assembled on the printed circuit board 1, the elastic conductive element 2 is compressed under the constraint of the depth of the groove 41, so that the interference fit between the elastic conductive element 2 and the shield case 4 is realized, and the shield case 4 is well connected with the printed circuit board 1.
In some embodiments, the difference between the length of the groove and the length of the elastic conductive element is less than or equal to 2mm along the arrangement direction of the elastic conductive element and the conductive points. The length of the elastic conductive piece in the arrangement direction of the elastic conductive piece and the conductive points can be set, so that after the shielding cover is assembled on the printed circuit board, the gap between the groove and the elastic conductive piece is smaller than or equal to 2mm, and the gap is small enough, and electromagnetic interference can be ignored.
In some embodiments, the elastic conductive member 2 is made of foam material, and has an elastic modulus of 0.4 Mpa-20 Mpa, for example, 0.4Mpa, 10Mpa, 15Mpa, 20Mpa, etc.; the conductive points are made of metal, the elastic modulus of the conductive points is between 250Mpa and 2000Mpa, for example, the elastic modulus can be 250Mpa, 500Mpa, 1000Mpa, 2000Mpa and the like, and the elastic modulus of the conductive points 3 is 100 times to 500 times of the elastic modulus of the elastic conductive piece. After the elastic conductive piece 2 and the conductive point 3 are in interference fit with the shielding case 4, the heights of the elastic conductive piece 2 and the conductive point 3 are smaller than the interval between the printed circuit board 1 and the shielding case 4.
In some embodiments, the elastic conductive member is SMT conductive foam and the conductive dots are tin dots. Wherein, the SMT conductive foam is made of flame-retardant sponge made of polyurethane or EPDM, and a layer of conductive cloth is processed outside the foam. Because the electronic components on the printed circuit board can be processed by adopting a surface mounting technology, the SMT conductive foam is adopted as the elastic conductive piece, so that the SMT conductive foam and the electronic components can be completed in the same automatic mounting production line without manual operation, and the production process is not needed, and the good stability and consistency are ensured based on the automatic production process. In addition, the SMT conductive foam can flexibly select the position of the feeding part according to the actual test result, so that the design flexibility is improved.
In some embodiments, the height of the elastic conductive member 2 is 2 to 5 times the distance between the printed circuit board 1 and the shield case 4, and the height of the conductive point 3 is 1.2 to 1.5 times the distance between the printed circuit board 1 and the shield case 4. For example, the distance between the printed circuit board 1 and the shielding case 4 is 1mm, the height of the elastic conductive piece 2 is 2mm-5mm, optionally 2mm, 3mm and 5mm, the height of the conductive point 3 (generally, the radius of the conductive point) is 1.2mm-1.5mm, optionally 1.2mm, 1.3mm and 1.5mm, the elastic conductive piece 2 and the conductive point 3 are in interference fit with the shielding case 4, the elastic conductive piece 2 is compressed, the conductive point 3 extends around, and the heights of the elastic conductive piece 2 and the conductive point 3 after the elastic conductive piece 2 and the conductive point 3 are in interference fit with the shielding case 4 are smaller than the distance between the printed circuit board 1 and the shielding case 4 by 1mm, so that the gap between the shielding case and the printed circuit board can be effectively filled.
The embodiment of the disclosure provides a printed circuit board assembly, which comprises an electronic component and an electromagnetic shielding structure provided by the embodiment of the disclosure, wherein the electronic component is arranged in an electronic component arrangement area of a printed circuit board.
The printed circuit board assembly disclosed in the above embodiment includes the electromagnetic shielding structure provided in the embodiment of the disclosure, and has the same or corresponding beneficial effects, and in order to avoid repetition, the description is omitted here.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides an electromagnetic shield structure, its characterized in that includes printed circuit board, a plurality of elasticity conductive piece, a plurality of conductive point and shield cover, the printed circuit board includes that electronic components sets up the region, elasticity conductive piece and the conductive point is fixed in on the printed circuit board, and around electronic components sets up regional interval ground layout, elasticity conductive piece and the conductive point all with the shield cover interference fit, elasticity conductive piece with the initial state's of conductive point height all is greater than the printed circuit board with the interval between the shield cover, and after interference fit the elasticity conductive piece with the height of conductive point all is less than the printed circuit board with the interval between the shield cover.
2. The electromagnetic shielding structure of claim 1, wherein the printed circuit board further comprises a connector arrangement region, and a portion of the conductive dots and all of the elastic conductive members are disposed at a periphery of the connector arrangement region.
3. The electromagnetic shielding structure of claim 2, wherein at least one of said conductive points is disposed between two adjacent ones of said elastic conductive members.
4. An electromagnetic shielding structure according to claim 3, wherein the spacing between adjacent ones of said elastic conductive members is less than or equal to 9mm.
5. The electromagnetic shielding structure of claim 1, wherein the shielding case includes a plurality of grooves provided corresponding to the elastic conductive members, the elastic conductive members are disposed in the grooves, and a depth of the grooves is smaller than a longitudinal height of the elastic conductive members in a natural state.
6. The electromagnetic shielding structure of claim 5, wherein a difference between a length of the groove and a length of the elastic conductive member along a layout direction of the elastic conductive member and the conductive point is less than or equal to 2mm.
7. The electromagnetic shielding structure of claim 1, wherein the elastic conductive member is an elastic member having conductive properties or an insulating elastic member having a surface coated with a conductive film layer.
8. The electromagnetic shielding structure of claim 1, wherein the elastic modulus of the elastic conductive member is between 0.4Mpa and 20Mpa, the elastic modulus of the conductive point is between 250Mpa and 2000Mpa, and the elastic modulus of the conductive point is 100 times to 500 times that of the elastic conductive member.
9. The electromagnetic shielding structure of claim 1, wherein the height of the elastic conductive member is 2 to 5 times the distance between the printed circuit board and the shield can, and the height of the conductive point is 1.2 to 1.5 times the distance between the printed circuit board and the shield can.
10. A printed circuit board assembly comprising an electronic component and an electromagnetic shielding structure according to any one of claims 1 to 9, the electronic component being disposed in an electronic component placement area of the printed circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320374600.9U CN219459665U (en) | 2023-02-24 | 2023-02-24 | Electromagnetic shielding structure and printed circuit board assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320374600.9U CN219459665U (en) | 2023-02-24 | 2023-02-24 | Electromagnetic shielding structure and printed circuit board assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219459665U true CN219459665U (en) | 2023-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320374600.9U Active CN219459665U (en) | 2023-02-24 | 2023-02-24 | Electromagnetic shielding structure and printed circuit board assembly |
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| Country | Link |
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| CN (1) | CN219459665U (en) |
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- 2023-02-24 CN CN202320374600.9U patent/CN219459665U/en active Active
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