Shielding cover, circuit module and metal detector

Abstract

The utility model relates to a shielding case, which comprises a first case body, the first case body is provided with a first base part and a first wall arranged around the first base part, the first base part and the first wall define a first accommodating space, the first wall is provided with a first side facing the first accommodating space and a second side opposite to the first side, the first side is provided with a receiving part, and the receiving part is provided with a first opening; the second side is used for accommodating a printed circuit board assembly and is provided with a first matching part; the second cover body is provided with a second base part and a second wall arranged around the second base part, the second base part and the second wall define a second accommodating space, the second wall is provided with a second matching part, and the first matching part is matched with the second matching part, so that the second cover body can be matched with the first cover body in a buckling manner; and the second wall at least partially coincides with the first wall. The shielding case can be mounted and dismounted without additional fasteners or mounting tools, so that the shielding case is prevented from being too loose or too tight. In addition, the utility model also relates to a circuit module and a metal detector.

Description

Technical Field

[0001] This utility model relates to a shielding cover. Additionally, this utility model also relates to a circuit module and a metal detector. Background Technology

[0002] Some printed circuit board assemblies (PCBAs) may contain interference modules that emit electromagnetic interference signals, which may affect the normal operation of nearby electrical components. Therefore, it is necessary to reduce the interference of these signals.

[0003] Existing shields are typically custom-designed to handle interfering signals. For example, a shield is attached to a specific part of a printed circuit board assembly (based on pre-defined mounting features) to enclose the interfering module. Such shields are often non-removable, or their assembly or disassembly is complex or difficult, making them inconvenient for engineers to replace.

[0004] There is still a need to provide an improved shield that can overcome one or more of the disadvantages of the prior art. Utility Model Content

[0005] The purpose of this invention is to provide a shielding cover that can be stably installed and easily disassembled without any installation tools, and avoids or at least partially reduces the technical problems of loosening or being too tight during installation or disassembly.

[0006] According to a first aspect of the present invention, a shielding cover is provided, which may include: a first cover body having a first base and a first wall arranged around the first base, the first base and the first wall defining a first receiving space, wherein the first wall has a first side facing the first receiving space and an opposite second side, the first side having a receiving portion for receiving a printed circuit board assembly, and the second side having a first mating portion; and a second cover body having a second base and a second wall arranged around the second base, the second base and the second wall defining a second receiving space, wherein the second wall has a second mating portion, wherein the first mating portion and the second mating portion cooperate to allow the second cover body to snap into the first cover body, and the second wall and the first wall at least partially overlap in the vertical direction.

[0007] This shielding cover can enclose almost the entire printed circuit board assembly, achieving excellent shielding performance. Furthermore, the cover can be installed and removed without additional fasteners (such as screws) or any additional installation tools, and its overlapping arrangement improves the effectiveness of the snap-fit ​​connection, preventing it from being too loose or too tight. In particular, this shielding cover can be applied to printed circuit board assemblies without pre-drilled mounting features (such as holes or snap-fits).

[0008] According to the above aspects of the present invention, preferably, the first mating part may include a recessed part protruding toward the first receiving space, and the second mating part may include a protruding part protruding toward the second receiving space, the protruding part being able to snap into the recessed part so as to allow the second cover to snap into the first cover.

[0009] Thus, the shielding cover has a structure that facilitates snap-fit ​​installation. The first and second mating parts can interact and tension each other, enabling stable installation and easy disassembly without any tools.

[0010] According to the above aspects of the present invention, preferably, the second mating part can be elastically deformed at least partially so as to press against the first mating part when it is snapped into place.

[0011] In this way, the shielding cover achieves mutual tension through the interaction of elastic buckles, preventing loosening and enabling stable installation and easy disassembly without any tools.

[0012] According to the above aspects of the present invention, preferably, the first mating part may include an inclined section that extends toward the free end of the first wall, wherein the inclined section forms a first angle with the vertical direction, and the first angle may be in the range of 2-10 degrees.

[0013] This arrangement further improves the clamping effect and enables adaptive clamping. For example, when the two covers tend to separate, the clamping force automatically increases as the two covers move further apart, thus preventing loosening or separation.

[0014] According to the above aspects of the present invention, preferably, a first gap can be formed on both sides of the second mating part, so that the second mating part is attached to the second wall in a suspended manner.

[0015] This arrangement allows for elastic deformation of only the second mating part during installation, rather than the entire second wall, which facilitates snap-fit ​​installation and operation.

[0016] According to the above aspects of the present invention, preferably, the second mating part may include a first segment and a second segment, and a second gap may be formed between the first segment and the second segment.

[0017] This segmented arrangement further facilitates the assembly and disassembly of the second cover and makes it easier to control the magnitude of the elastic force.

[0018] According to the above aspects of the present invention, preferably, the receiving portion can extend at least partially along the circumferential direction and can include a first protrusion, a second protrusion spaced vertically from the first protrusion, and an intermediate portion formed between the first protrusion and the second protrusion, wherein at least a portion of the periphery of the printed circuit board assembly can be accommodated in the intermediate portion.

[0019] This arrangement allows the printed circuit board components to fit better into the shielding cover and simplifies the installation process.

[0020] According to the above aspects of this utility model, preferably, the first protrusion and the second protrusion can taper toward the first receiving space, so that at least a portion of the periphery of the circuit board can be clamped in the middle portion. In this way, the printed circuit board assembly can be stably fixed on the shielding cover without loosening.

[0021] According to the above aspects of the present invention, in order to further increase the support strength of the shielding cover for the printed circuit board assembly, preferably, the first wall may include at least four wall segments that are adjacent to each other to form a complete circumferential wall, and the receiving portion may be provided on at least two opposing wall segments.

[0022] According to the above aspects of the present invention, preferably, there may be a separation portion between two adjacent wall segments in at least four wall segments to allow relative displacement between the two adjacent wall segments.

[0023] This arrangement allows for changes in the distance between the wall segments, enabling the printed circuit board assembly to be snap-fitted into the first housing, further improving installation efficiency without the need for additional installation tools.

[0024] According to the above aspects of the present invention, preferably, the receiving part and the first mating part can be aligned in the vertical direction.

[0025] This arrangement enables elastic clamping at the receiving part after the printed circuit board assembly is installed into the shield, thereby improving the force balance of the printed circuit board assembly and holding it more securely.

[0026] According to the above aspects of the present invention, preferably, the first wall may be provided with a third mating part, which extends flatly along the second side of the first wall or protrudes from the second side so as to contact the second mating part.

[0027] This arrangement minimizes the gap between the first and second shields, improving the reliability of electrical conduction and thus enhancing the electromagnetic shielding performance of the shield.

[0028] According to the above aspects of this utility model, preferably, the first and second covers can be manufactured using metal sheets through stamping or bending processes. This reduces processing costs and enhances electromagnetic shielding performance.

[0029] According to the above aspects of the present invention, preferably, in order to further enhance the strength and reliability of the shielding cover, the first wall has a first thickness, the second wall has a second thickness, and the first thickness may be greater than the second thickness.

[0030] According to a second aspect of the present invention, a circuit module is provided, which may include: a shielding cover as described in the first aspect, and a printed circuit board assembly, the printed circuit board assembly including an interference module capable of emitting electromagnetic interference signals, wherein the printed circuit board assembly is housed within the shielding cover such that the electromagnetic interference signals emitted by the interference module are attenuated to below a predetermined threshold level by the shielding cover. This circuit module can meet predetermined EMC / EMI requirements through the shielding cover without re-processing mounting features (such as holes, clips) on the printed circuit board assembly, and without requiring additional mounting or disassembly tools.

[0031] According to the above aspects of the present invention, in order to achieve a better electromagnetic shielding effect, preferably, there is one or more gaps between the shielding cover and the mounting structure or printed circuit board assembly, the one or more gaps connecting the internal space of the shielding cover and the external space of the shielding cover, wherein the shielding cover is configured such that the width of the one or more gaps can be less than 1 / 20 of the wavelength of the electromagnetic wave emitted by the interference module of the printed circuit board assembly.

[0032] According to a third aspect of the present invention, a metal detector comprising the circuit module described in the second aspect is proposed.

[0033] Therefore, the shielding cover of this utility model can meet the usage requirements, overcome the shortcomings of the prior art, and achieve the intended purpose. Attached Figure Description

[0034] To further clarify the shielding cover according to the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. In the accompanying drawings:

[0035] Figure 1 A schematic diagram of a circuit module according to a non-limiting embodiment of the present invention is shown;

[0036] Figure 2 Shown Figure 1 A schematic cross-sectional view of the circuit module shown;

[0037] Figure 3 Shown Figure 2 A schematic enlarged view of a portion of the circuit module shown;

[0038] Figure 4 Shown Figure 3 A schematic enlarged view of a portion of the circuit module shown;

[0039] Figure 5 A schematic diagram of the first cover of the shielding cover according to a non-limiting embodiment of the present invention is shown;

[0040] Figure 6 A schematic diagram of the second cover of the shielding cover according to a non-limiting embodiment of the present invention is shown; and

[0041] Figure 7 Shown Figure 6 A schematic enlarged view of a portion of the second enclosure shown.

[0042] The above figures are for illustrative purposes only and are not drawn to scale.

[0043] The reference numerals in the figures are listed in the figures and embodiments:

[0044] 1000 - Circuit module, including:

[0045] 100 - Shielding cover, including:

[0046] 10 - The first enclosure includes:

[0047] 10A – First Accommodation Space;

[0048] 11 – First base;

[0049] 12 - The first wall includes:

[0050] 12A – First side;

[0051] 12B – Second side;

[0052] 121-lower anterior wall;

[0053] 122 – Lower posterior wall, including:

[0054] 122A – Notch;

[0055] 123 - Lower left wall;

[0056] 124 - Lower right wall;

[0057] 13 - Reception Department, including:

[0058] 13A-The first convex part;

[0059] 13B-The second convex part;

[0060] 13C – Middle section;

[0061] 14 - First Coordination Section;

[0062] 15 - Inclined section;

[0063] 16 - Free end;

[0064] 17 - Third Coordination Unit;

[0065] 20 - Second cover, including:

[0066] 20A – Second Accommodation Space;

[0067] 21 – Second base;

[0068] 22 – The second wall includes:

[0069] 221 – Upper anterior wall;

[0070] 222 – Upper posterior wall;

[0071] 223 - Upper left wall;

[0072] 224 – Upper right wall;

[0073] 23 – Second coordination unit, including:

[0074] 23A – Part One;

[0075] 23B – Part Two;

[0076] 24 – First gap;

[0077] 25 – Second gap;

[0078] 30 – Separation section;

[0079] 200 – Printed circuit board assemblies, including:

[0080] 200A - Submodule;

[0081] 300 - Gap;

[0082] D – Gap width;

[0083] α – First angle;

[0084] V – Vertical direction;

[0085] C – Circumferential direction. Detailed Implementation

[0086] It should be understood that, unless explicitly stated otherwise, the present invention may employ various alternative orientations and sequences of steps. It should also be understood that the specific devices shown in the drawings and described in the specification are merely exemplary embodiments of the inventive concept disclosed and defined herein. Therefore, unless expressly stated otherwise, the specific orientations, directions, or other features involved in the various disclosed embodiments should not be considered limiting.

[0087] In industries such as food and pharmaceuticals, metal detectors or detectors are commonly used to detect or identify the presence of residual metals. These metal detectors typically employ multi-frequency scanning technology, utilizing accurate frequency spectra and advanced signal processing techniques to detect metal contaminants in food or pharmaceuticals. To achieve this, circuit modules including radio frequency modules are usually required. For example, circuit modules using the Modbus protocol often include interference modules capable of emitting electromagnetic interference signals. For instance, a Modbus-based circuit module might contain a communication module that emits electromagnetic interference. The electromagnetic signals emitted by these interference modules can affect the normal operation of surrounding circuits / electrical components.

[0088] Therefore, in order to reduce the interference of these interference signals, technicians have housed the printed circuit board assembly in a shield, so that the electromagnetic interference signals emitted by the interference module are attenuated to below a predetermined threshold level by the shield.

[0089] The inventors of this invention have discovered that, for new product development, space constraints sometimes prevent the design of shielding mounting features on printed circuit board assemblies. Additionally, some older products were not originally designed with mounting features (such as holes, clips, etc.). Therefore, upgrading older products or replacing electronic components on the PCBA may lead to EMC / EMI issues. Thus, adding shielding without making any design changes to the existing structure or PCBA presents a challenge for engineers.

[0090] Furthermore, the inventors of this invention have discovered that common shielding structures often suffer from being too tight or too loose during installation or disassembly. Loose installation may cause some electronic components on the PCBA to experience performance issues due to vibration, while overly tight installation may damage the shielding during disassembly. Therefore, there is an urgent need to provide an improved shielding.

[0091] Figure 1 A schematic diagram of a circuit module 1000 according to a non-limiting embodiment of the present invention is shown, while Figure 2 It shows Figure 1 A schematic cross-sectional view of the circuit module 1000 shown.

[0092] As shown in the figure and as a non-limiting example, the circuit module 1000 may mainly include a shield 100 and a printed circuit board assembly 200.

[0093] As described above, the printed circuit board assembly 200 may include an interference module capable of emitting electromagnetic interference signals. According to an embodiment of the present invention, the printed circuit board assembly 200 can be housed within a shielding cover 100, such that the electromagnetic interference signals emitted by the interference module are attenuated below a predetermined threshold level by the shielding cover 100. This threshold level is, for example, a level that allows surrounding electrical components to operate normally without being interfered with by the electromagnetic interference signals emitted by the interference module.

[0094] It should be understood that those skilled in the art can determine, based on well-known radiation testing standards in various countries or industries, such as FCC Class A, 1) which components on printed circuit board assemblies are interference modules, or 2) set a predetermined threshold to ensure that the electromagnetic interference signals emitted by the interference module are effectively shielded by the shielding cover.

[0095] For example, to comply with FCC Class A requirements, the electromagnetic interference (EMI) of electronic devices must be below specified limits within a particular frequency range. Specifically, FCC Class A limits on electromagnetic interference are as follows:

[0096] • In the range from 10 kHz to 30 MHz: the field strength of radiated emissions must not exceed 100 microvolts per meter (μV / m).

[0097] • In the range of 30MHz to 230MHz: the field strength of radiated emissions must not exceed 30 microvolts per meter (μV / m).

[0098] • In the range from 230 MHz to 1 GHz: the field strength of radiated emissions must not exceed 37 microvolts per meter (μV / m).

[0099] Based on this standard (or other common industry standards), it is possible to determine which printed circuit board components are emitting electromagnetic interference signals, and whether the interference signals are attenuated after the shield 100 is installed.

[0100] The shield 100 can be a multi-piece split structure, for example, a two-piece split structure, and can include a first shield 10 and a second shield 20.

[0101] like Figure 2 As shown in detail, the first cover 10 and the second cover 20 may each have a generally U-shaped cross-section and an opening at one end, such that the first cover 10 and the second cover 20 can be fitted together through the respective openings to form a generally enclosed receiving space. The printed circuit board assembly 200 can be received within the receiving space defined or enclosed by the first cover 10 and the second cover 20.

[0102] As used in this article, "forming a generally enclosed containment space" or "the containment space defined or enclosed" means that the space formed by the combination of the first cover 10 and the second cover 20 is not completely enclosed. Figure 1 As schematically illustrated, the printed circuit board assembly 200 typically includes corresponding sub-modules 200A, such as adapter modules or connection modules, for providing power to the printed circuit board assembly 200 or for transmitting various signals between the printed circuit board assembly 200 and other circuit modules. Furthermore, as described in more detail below, the first cover 10 and the second cover 20 do not form a completely tight fit after mating. For example, the first cover 10 and the second cover 20 are not tightly engaged at every location along the circumferential direction C.

[0103] Thus, one or more gaps 300 may exist between the shield 100 and the mounting structure (e.g., a fixing structure or connector) or the printed circuit board assembly 200. These one or more gaps 300 may connect the internal space of the shield 100 with the external space of the shield 100.

[0104] According to an embodiment of the present invention, the shield 100 may be configured such that the width D of one or more gaps 300 is less than 1 / 20 of the wavelength of the electromagnetic wave emitted by the interference module of the printed circuit board assembly 200, thereby avoiding or minimizing the leakage of electromagnetic waves to the outside of the shield 100 through the gaps 300.

[0105] As an example, the wavelength range of the electromagnetic waves emitted by the interference module is between 30mm and 1,000mm. Furthermore, when determining the width D of the slit 300, both the wavelength and the slit can be measured in millimeters (mm).

[0106] Continue to refer to Figure 2 The first cover 10 may be provided with a first base 11 and a first wall 12 arranged around the first base 11, and the first base 11 and the first wall 12 may define a first receiving space 10A. Similarly, the second cover 20 may be provided with a second base 21 and a second wall 22 arranged around the second base, and the second base 21 and the second wall 22 may define a second receiving space 20A.

[0107] Thus, the first cover 10 and the second cover 20 each form a cover with an opening at one end. Figure 2In the illustrated embodiment, the height of the first cover 10 in the vertical direction V can be greater than the height of the second cover 20, and the outer circumferential dimension of the first cover 10 in the circumferential direction C can be smaller than the outer circumferential dimension of the second cover 20, so that the second cover 20 can snap into the first cover 10, and the second wall 22 at least partially overlaps with the first wall 12. Thus, the second cover 20 can cover the first cover 10, and the first receiving space 10A and the second receiving space 20A at least partially overlap.

[0108] Figure 3 It shows Figure 2 A schematic enlarged view of a portion of the circuit module 1000 shown.

[0109] As shown in the figure, the first wall 12 has a first side 12A facing the first receiving space 10A and an opposite second side 12B. As an example, the first side 12A may be provided with a receiving portion 13 for receiving the printed circuit board assembly 200, while the second side 12B is provided with a first mating portion 14.

[0110] Preferably, the first mating portion 14 may include a recessed portion protruding toward the first receiving space 10A. Thus, the first mating portion 14 may have a protruding portion on the first side 12A and a recessed portion on the second side 12B. In other words, when viewed from the first side 12A, the first mating portion 14 protrudes from the first side 12A, while when viewed from the second side 12B, the first mating portion 14 is recessed into the second side 12B, such as... Figure 3 It can be clearly seen in the text.

[0111] As a preferred embodiment and as Figure 3 As shown, the receiving part 13 and the first mating part 14 can be approximately aligned in the vertical direction V and are spaced apart from each other. Figure 3 As shown, the receiving portion 13 can be vertically positioned below the first mating portion 14. It should be understood that the alignment or approximate alignment of the receiving portion 13 and the first mating portion 14 in this context may mean that the receiving portion 13 and the first mating portion 14 at least partially overlap along the circumferential direction C, or more preferably, that their circumferential or lateral midpoints are aligned in the vertical direction V.

[0112] like Figure 2 and 3 As schematically shown, the second wall 22 may be provided with a second mating portion 23. The second mating portion 23 may include a protrusion projecting toward the second receiving space 20A. For example, the second mating portion 23 may have a generally V-shaped opening, and the generally V-shaped opening in... Figure 3 and 4 It opens to the right from the center.

[0113] In this way, the protrusion of the second mating part 23 can engage with the recess of the first mating part 14, allowing the second cover 20 to engage with the first cover 10. In other words, the first mating part 14 and the second mating part 23 engage so that the second cover 20 can engage with the first cover 10, and as shown in the figure, the second wall 22 and the first wall 12 at least partially overlap, especially the end portions of the second wall 22 and the first wall 12.

[0114] It should be understood that the “protrusions” and “recesses” described herein in conjunction with the accompanying drawings are merely examples for describing the working principle of the first mating part 14 and the second mating part 23. Those skilled in the art can provide the opposite arrangement or other alternative arrangements, as long as they allow for the elastic snap-fit ​​between the first mating part 14 and the second mating part 23.

[0115] For example, as an alternative embodiment, the first mating portion 14 may include a protrusion (i.e., protruding outward from the second side 12B of the first wall 12) that protrudes away from the first receiving space 10A, while the second mating portion 23 may include a recess (i.e., protruding from the second receiving space 20A) that protrudes away from the second receiving space 20A. Figure 3 and 4 The difference shown is that the generally V-shaped opening faces left, so as to allow the same elastic snap-fit ​​engagement between the first mating part 14 and the second mating part 23. In this case, it is preferable that the end of the second wall 22 is still spaced apart from the second side 12B of the first wall 12 to facilitate manual operation, especially disassembly.

[0116] exist Figure 2 and 3 In the illustrated embodiment, after the first cover 10 and the second cover 20 are engaged, the first cover 10 can be inside, while the second cover 20 can be outside. It should be understood that the dimension of the first engaging portion 14 in the vertical direction V is set to allow the second engaging portion 23 to move downwards a sufficient distance so that the upper free end 16 of the first wall 12 can abut against the second base 21 of the second cover 20. Furthermore, preferably and as shown, the thickness of the first cover 10 can be greater than the thickness of the second cover 20.

[0117] According to an embodiment of the present invention, the second mating part 23 can be at least partially elastically deformed so as to press against the first mating part 14 when it is snapped into place. In this way, the first cover 10 can apply an elastic clamping force to the second cover 20.

[0118] Figure 4 Shown Figure 3 A schematic enlarged view of a portion of the circuit module 1000 shown.

[0119] As shown in the figure and as a non-limiting example, the first mating portion 14 may include an inclined section 15 extending toward the free end 16 of the first wall 12. For example, the inclined section 15 may extend outward ( Figure 4 It tilts upwards and to the right (from the center), and can form a first angle α with the vertical direction V. Specifically, this first angle α is... Figure 4 The image is shown by two dashed lines. The vertical dashed line on the left represents the vertical direction V, while the sloping dashed line on the right extends along the outer surface of the second side 12B of the first wall 12. In other words, the sloping dashed line extends along the sloping section 15, that is, along the outer contour of the second side 12B (in...). Figure 4 The projection of the plane (normal direction) extends from the plane shown. Preferably, the first angle α can be in the range of 2-10 degrees.

[0120] After installation, if the first cover 10 and the second cover 20 tend to separate from each other due to vibration or other reasons, then the first cover 10 and the second cover 20 will move away from each other. For example, in Figure 4 In the example shown, the first cover 10 may have a tendency to move upward relative to the second cover 20, and the second mating part 23 will correspondingly have a tendency to move upward. However, this tendency to move is suppressed by the inclined section 15. Specifically, as the first cover 10 moves away from the second cover 20, the elastic force of the inclined section 15 acting on the second mating part 23 will gradually increase, thereby suppressing the movement of the first cover 10.

[0121] In addition, such as Figure 4 As shown, the slope of the inclined section 15 and the first wall 12 above it can be different, so that the inclination of the portion near the free end 16 of the first wall 12 is reduced to form an installation guide, thereby further facilitating the fitting installation between the first cover 10 and the second cover 20.

[0122] Figure 5 A schematic diagram of the first cover 10 of a shield 100 according to a non-limiting embodiment of the present invention is shown.

[0123] The first cover 10 may have a generally rectangular shape. As shown, the first cover 10 may have a generally planar first base 11 and a first wall 12. The first cover 10 may have an opening at the top and the first wall 12 may include at least four wall segments that are adjacent to each other to form a complete circumferential wall.

[0124] For example, at least four wall segments can be the lower front wall 121, lower rear wall 122, lower left wall 123, and lower right wall 124 shown in the figures. A separation portion 30 may exist between any two adjacent wall segments to allow relative displacement between adjacent wall segments. For example, in... Figure 5In the illustrated embodiment, four separation sections 30 may be provided, i.e., one separation section 30 is provided at each corner. As an example, the first cover 10 can be made from metal sheet by stamping or bending processes. In this way, the separation sections 30 can be directly formed using stamping or bending processes.

[0125] like Figure 2 , 3 As schematically shown in Figure 5, the receiving portion 13 extends at least partially along the circumferential direction C, for example, it may extend substantially parallel to the first base 11, so that after receiving the printed circuit board assembly 200, the printed circuit board assembly 200 may remain substantially parallel to the first base 11.

[0126] As an example, the receiving portion 13 may include a first protrusion 13A, a second protrusion 13B spaced apart from the first protrusion 13A in the vertical direction V, and an intermediate portion 13C formed between the first protrusion 13A and the second protrusion 13B. As shown in the figure, the first protrusion 13A, the second protrusion 13B, and the intermediate portion 13C may each be parallel to each other and extend substantially parallel to the first base 11. In this way, at least a portion of the periphery of the printed circuit board assembly 200 can be accommodated in the intermediate portion 13C.

[0127] In a preferred embodiment, the first protrusion 13A and the second protrusion 13B can taper toward the first receiving space 10A to form a peak-shaped arrangement, so that at least a portion of the periphery of the circuit board can be clamped in the middle portion 13C.

[0128] Continue to refer to Figure 5 In order to stably hold the printed circuit board assembly 200, the receiving part 13 is provided on at least two opposing wall sections, and more preferably on each wall section.

[0129] A notch may be provided on at least one wall segment of the first wall 12. For example, such as Figure 5 As can be seen more clearly, three notches can be provided on the lower rear wall 122 for mating with the corresponding sub-module 200A of the printed circuit board assembly 200.

[0130] For example, a third mating portion 17 may be formed between the two notches on the right side of the first wall 12. This third mating portion 17 may extend flatly along the second side 12B of the first wall 12 to contact the second mating portion 23. In an alternative embodiment not shown, the third mating portion 17 may also protrude from the second side 12B. For example, it may protrude outwards along the outer surface of the generally planar second side 12B.

[0131] Figure 6 A schematic diagram of the second cover 20 of a shielding cover 100 according to a non-limiting embodiment of the present invention is shown; while Figure 7 It shows Figure 6 A schematic enlarged view of a portion of the second enclosure 20 shown.

[0132] The second cover 20 can similarly have a generally rectangular shape. As shown, the second cover 20 can have a generally planar second base 21 and a second wall 22. The second cover 20 can have an opening at the bottom and the second wall 22 can include at least four wall segments that are adjacent to each other to form a complete circumferential wall.

[0133] For example, at least four wall segments can be the upper front wall 221, upper rear wall 222, upper left wall 223, and upper right wall 224 shown in the figures. Separation portions can also exist between adjacent wall segments to allow relative displacement between adjacent wall segments. For example, in Figure 6 In the illustrated embodiment, four separation sections may be provided. As an example, the second cover 20 can be manufactured using a metal sheet through a stamping or bending process. In this way, the separation sections can be directly formed using a stamping or bending process.

[0134] A notch may be provided on at least one wall segment of the second wall 22. For example, such as Figure 1 and 6 As can be seen more clearly, three notches can be provided on the upper rear wall 222 to cooperate with the three notches on the lower rear wall 122 and the corresponding sub-module 200A of the printed circuit board assembly 200.

[0135] In addition, Figure 6 A second mating part 23 can be provided between two adjacent notches shown. For example, Figure 6 The second mating part 23 on the left side can mate with the first mating part 14 of the first cover 10, while the second mating part 23 on the right side can mate with the third mating part 17.

[0136] like Figure 7 As shown in more detail, first gaps 24 may be formed on both sides of the second mating portion 23 of the second wall 22, such that the second mating portion 23 is attached to the second wall 22 in a suspended manner. Preferably, each second mating portion 23 may also include a first segment 23A and a second segment 23B, and a second gap 25 may be formed between the first segment 23A and the second segment 23B.

[0137] The two-piece shield 100 according to this invention can be fixed or held onto the printed circuit board assembly 200 by means of elastic clips. After installation, the mating structure of the first shield 10 and the second shield 20 can interact and tension with each other, thereby achieving stable installation and easy disassembly.

[0138] During installation / use, the printed circuit board assembly 200 can first be clipped into the first cover 10. As an example, due to the presence of the separation part 30, the lower front wall 121, lower rear wall 122, lower left wall 123 and lower right wall 124 can be slightly displaced relative to each other, thereby widening the opening of the first cover 10 to facilitate the insertion of the printed circuit board assembly 200 into the receiving part 13, and elastically returning to its original position after insertion.

[0139] Then, the second cover 20 can be installed. For example, the second cover 20 can be installed on top of the first cover 10, and the first cover 10 can more firmly clamp the printed circuit board assembly 200, making the shield 100 more stable and preventing loosening or vibration. The installed circuit module 1000 is as follows: Figure 1 and 2 As shown.

[0140] Thus, the shielding cover 100 according to this invention can enclose or accommodate the entire printed circuit board assembly 200 (as described above, except where submodules 200A or mounting structures are provided), ensuring good shielding performance. Furthermore, the installation and removal of the shielding cover 100 requires no additional fasteners (e.g., screws) or any additional installation tools.

[0141] The terms “upper side” or “lower side” used herein to indicate orientation or direction, and the terms “first”, “second”, etc. used to indicate sequence, are merely to enable those skilled in the art to better understand the concept of the present invention as shown in the preferred embodiments, and are not intended to limit the present invention. Unless otherwise stated, all sequences, orientations, or directions are used only to distinguish one element / component / structure from another, and unless otherwise stated, do not indicate any particular order, sequence of operations, direction, or orientation. For example, in an alternative embodiment, “first cover” may be “second cover”, and “upper side” may instead refer to “lower side”. Furthermore, it should be understood that terms such as “vertical direction” and “circumferential direction” used herein are directions given illustratively based on the accompanying drawings and are not necessarily consistent with or the same as the directions in actual application.

[0142] As used herein, unless otherwise specified, the terms “approximately” and “about” are interpreted as indicating a value or range of values ​​plus or minus five percent, or a deviation of the shape and / or position from the value by plus or minus five percent.

[0143] In summary, the shielding cover 100 and circuit module 1000 according to the embodiments of this utility model overcome the shortcomings of the prior art and achieve the intended purpose of the utility model.

[0144] Although the circuit module of this utility model has been described above with reference to preferred embodiments, those skilled in the art should recognize that the above examples are merely illustrative and should not be construed as limiting the utility model. Therefore, various modifications and variations can be made to this utility model within the spirit and scope of the claims, and all such modifications and variations will fall within the scope claimed by the claims of this utility model.

Claims

1. A shielding cover (100), characterized in that, The shielding cover (100) includes: A first cover (10) is provided with a first base (11) and a first wall (12) arranged around the first base. The first base (11) and the first wall (12) define a first receiving space (10A). The first wall (12) has a first side (12A) facing the first receiving space (10A) and an opposing second side (12B). The first side (12A) is provided with a receiving portion (13) for receiving a printed circuit board assembly (200), and the second side (12B) is provided with a first mating portion (14). A second cover (20) is provided with a second base (21) and a second wall (22) arranged around the second base. The second base (21) and the second wall (22) define a second receiving space (20A). The second wall (22) is provided with a second mating part (23). The first mating part (14) and the second mating part (23) cooperate to allow the second cover (20) to snap into the first cover (10), and the second wall (22) and the first wall (12) at least partially overlap in the vertical direction (V).

2. The shielding cover (100) according to claim 1, characterized in that, The first mating part (14) includes a recess protruding toward the first receiving space (10A), and the second mating part (23) includes a protruding part protruding toward the second receiving space (20A). The protruding part can snap into the recess to allow the second cover (20) to snap into the first cover (10).

3. The shielding cover (100) according to claim 2, characterized in that, The second mating part (23) is at least partially elastically deformable so as to press against the first mating part (14) in a snap-fit ​​state.

4. The shielding cover (100) according to claim 3, characterized in that, The first mating part (14) includes an inclined section (15) that extends toward the free end (16) of the first wall (12), wherein the inclined section (15) forms a first angle (α) with the vertical direction (V), and the first angle is in the range of 2-10 degrees.

5. The shielding cover (100) according to claim 3, characterized in that, A first gap (24) is formed on both sides of the second mating part (23), so that the second mating part (23) is attached to the second wall (22) in a suspended manner.

6. The shielding cover (100) according to claim 3, characterized in that, The second mating part (23) includes a first section (23A) and a second section (23B), forming a second gap (25) between the first section and the second section.

7. The shielding cover (100) according to claim 1, characterized in that, The receiving portion (13) extends at least partially along the circumferential direction (C) and includes a first protrusion (13A), a second protrusion (13B) spaced apart from the first protrusion in the vertical direction (V), and an intermediate portion (13C) formed between the first protrusion and the second protrusion, wherein at least a portion of the periphery of the printed circuit board assembly (200) can be accommodated in the intermediate portion (13C).

8. The shielding cover (100) according to claim 7, characterized in that, The first protrusion (13A) and the second protrusion (13B) taper toward the first receiving space (10A) such that at least a portion of the periphery of the circuit board can be clamped in the middle portion (13C).

9. The shielding cover (100) according to claim 8, characterized in that, The first wall (12) includes at least four wall segments that are adjacent to each other to form a complete circumferential wall, and the receiving portion (13) is provided on at least two opposing wall segments.

10. The shielding cover (100) according to claim 9, characterized in that, There is a separation portion (30) between two adjacent wall segments of the at least four wall segments to allow relative displacement between the two adjacent wall segments.

11. The shielding cover (100) according to any one of claims 1-10, characterized in that, The receiving part (13) is aligned with the first mating part (14) in the vertical direction.

12. The shielding cover (100) according to any one of claims 1-10, characterized in that, The first wall (12) is provided with a third mating part (17), which extends flat along the second side (12B) of the first wall (12) or protrudes from the second side (12B) so as to contact the second mating part (23).

13. The shielding cover (100) according to any one of claims 1-10, characterized in that, The first cover (10) and the second cover (20) are made of metal sheets by stamping or bending processes.

14. A circuit module (1000), characterized in that, The circuit module (1000) includes: a shielding cover (100) according to any one of claims 1-13, and A printed circuit board assembly (200) includes an interference module capable of emitting electromagnetic interference signals. The printed circuit board assembly (200) is housed in the shield (100), such that the electromagnetic interference signal emitted by the interference module is attenuated to below a predetermined threshold level via the shield (100).

15. The circuit module (1000) according to claim 14, characterized in that, One or more gaps (300) exist between the shielding cover (100) and the mounting structure or the printed circuit board assembly (200), the one or more gaps (300) connecting the internal space of the shielding cover (100) with the external space of the shielding cover (100). The shield (100) is configured such that the width (D) of the one or more gaps (300) is less than 1 / 20 of the wavelength of the electromagnetic wave emitted by the interference module of the printed circuit board assembly (200).

16. A metal detector, characterized in that, The metal detector includes the circuit module (1000) according to claim 14 or 15.

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