GB2601333A - Electromagnetic interference shield device - Google Patents
Electromagnetic interference shield device Download PDFInfo
- Publication number
- GB2601333A GB2601333A GB2018617.7A GB202018617A GB2601333A GB 2601333 A GB2601333 A GB 2601333A GB 202018617 A GB202018617 A GB 202018617A GB 2601333 A GB2601333 A GB 2601333A
- Authority
- GB
- United Kingdom
- Prior art keywords
- base
- planar section
- plane
- side portion
- extending
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/002—Casings with localised screening
- H05K9/0022—Casings with localised screening of components mounted on printed circuit boards [PCB]
- H05K9/0024—Shield cases mounted on a PCB, e.g. cans or caps or conformal shields
- H05K9/0026—Shield cases mounted on a PCB, e.g. cans or caps or conformal shields integrally formed from metal sheet
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0009—Casings with provisions to reduce EMI leakage through the joining parts
Abstract
An electromagnetic interference shield 10 includes a base portion 14 extending within a base plane 16, a first side portion 18 integrally formed with the base portion 14 and extending within a first plane 22 perpendicular to the base plane, a second side portion 20 integrally formed with the base portion and extending within a second plane 24 perpendicular to the first plane and the base plane, and a corner portion 26. The corner portion includes a first planar section 28 extending within the first plane and a second planar section 30 extending within the second plane, wherein the first planar section transitions into the second planar section via a curved section 32. The first planar section is integrally formed with the first side portion. An end face 36 of the second planar section and an end face 38 of the second side portion form a gap of less than 1 mm between them.
Description
Description
Electromagnetic interference shield device The present invention relates to an electromagnetic interference shield device for shielding components mounted on a printed circuit board from electromagnetic interference.
Electronic equipment may include electrical components and circuits mounted on a substrate such as a printed circuit board. Electronic equipment may be sensitive to electromagnetic interference. Such electromagnetic interference may originate, for example, from internal sources within the electronic equipment and/or from external sources. Interference can affect the signals of electrical components which may result in the electronic equipment being inefficient or in the worst case inoperable.
Thus, electronic equipment usually includes a kind of electromagnetic interference shield device. The shield device reduces electromagnetic interference and ensures that the electronic equipment functions properly.
The electromagnetic interference shield device is usually affixed to the printed circuit board, covers the electronic components mounted on the printed circuit board and forms a kind of Faraday cage around the electronic components for shielding the same.
Known electromagnetic interference shield devices are often made of a bent sheet metal. The bending process, however, often results in open corners between adjacent side walls of the shield device. It was found that these open corners allow for transmission of electromagnetic waves, reducing the overall performance of the shield device which is unfavorable.
Thus, it is an object of the present invention to provide an electromagnetic interference shield device having an improved shielding performance.
This object is solved by an electromagnetic interference shield device according to claim 1. Further advantages and developments are given in the dependent claims.
According to an aspect of the present invention, an electromagnetic interference shield device is provided. The shield device comprises a base member including a base portion extending within a base plane, a first side portion integrally formed with the base portion and extending within a first plane perpendicular to the base plane, a second side portion different from the first side portion and integrally formed with the base portion, the second side portion extending within a second plane perpendicular to the first plane and perpendicular to the base plane, and a corner portion including a first planar section extending within the first plane and a second planar section extending within the second plane, wherein the first planar section transitions into the second planar section via a curved section integrally formed with the first planar section and the second planar section, wherein the first planar section is integrally formed with first side portion and an end face of the second planar section and an end face of the second side portion from a gap of less than 1 mm between them.
The present invention is at least partially based on the idea that a corner gap formed between the first side portion and the second side portion can be minimized by a dedicated corner portion. The present invention is further based on the idea that the corner portion should provide a smooth transition between the first side portion and the adjacent second side portion extending basically perpendicular to the first side portion. The present invention is further based on the idea that in order to provide such smooth transition, the dedicated corner portion includes a curved portion. The curve portion enables the first planar section that is integrally formed or connected with the first side portion to transition smoothly into the second planar section aligned with the second side portion as both the second planar section and the second side portion extend within the second plane. The present invention is further based on the idea that the second planar section is selected such that the end faces of the second planar section and the second side portion which face each other form a gap of less than 1 mm, preferably less than 0.5 mm, more preferably less than 0.2 mm, between them. By ensuring that the gap between opposite end faces of the second planar section and the second side portion is less than 1 mm, any electromagnetic transmission through the gap is essentially cut to a minimum. Thus, a shield device with an improved shielding performance can be provided.
The base member of the shield device according to the present invention can be made of a sheet metal which is bent to form the shield device. As the bending process is subject to manufacturing limitations, the bending of the sheet metal may result in small variations of the gap between end faces of the second planar section and the second side portion. Thus, it is possible that the end face of the second planar section and the end face of the second side portion may at least partially abut each other. Within this disclosure, therefore, the wording "a gap of less than 1 mm" also includes configurations where the two opposite end faces may at least partially abut each other.
Moreover, within this disclosure, the wording "integrally formed with" means that, e.g. the first side portion, the second side portion, the corner portion and the base portion are made from a unitary single sheet metal which -through bending -forms the first side portion, the second side portion, the corner portion and the base portion. In other words, the first side portion, the second side portion, the corner portion and the base portion are no separate members or separate parts, but portions of a unitary single part. This unitary single part can be the base member which -through bending -includes the various parts.
According to a preferred embodiment of the present invention, the base member includes a further (another) corner portion in addition to the already described corner portion, wherein the first planar section of the further corner portion and the first planar section of the already described corner portion are integrally formed on opposite ends of the first side portion.
The preferred embodiment is at least partially based on the idea that using two corner portions on opposite distal ends of the first side portion, the two corner portions can be integrally formed with the first side portion. In addition, due to this arrangement, complexity during the bending process of the sheet metal is reduced.
Thus, for example, in a first step, the second side portion is bent to extend perpendicular to the base plane. Then, in a second step, the corner portion and the further corner portion which are integrally formed with the first side portion are bent along respective axes with respect to the first side portion so that the respective second planar section of the respective corner portion extends perpendicular to the first plane. At this stage, the first side portion extends within the base plane, i.e. is not bent relative to the base plane. Then, in a third step, the first side portion is bent along an axis with respect to the base portion such that the side portion extends perpendicular to the base plane. By bending the side portion to extend perpendicular to the base plane, the already bent corner portions align with the second side portion and form the gap of less than 1 mm, as described. Thus, the preferred embodiment enables an easy and cost-effective way of producing the shield device through a technical bending process.
According to another preferred embodiment of the present invention, the curved section of the corner portion includes a radius in a range of about 0.1 mm to about 0.8 mm. This preferred embodiment is at least partially based on the idea that the radius of the curved section is in the range of a thickness of the sheet metal that is used to form the base member. The radius is the smallest feasible radius which can be achieved using a sheet metal having a thickness in the range of about 0.1 mm to about 0.8 mm.
According to another preferred embodiment of the present invention, the base portion of the base member includes an opening extending through the base portion and the shield device further comprises a cover member arranged on top of the base member, wherein the cover member includes a base wall, a first side wall and a second side wall adjacent the first side wall, the first side wall and the second side each extending perpendicular to the base wall, the first side wall and the second side wall also extending perpendicular to each other, wherein, when the cover member is arranged on top of the base member, the first side wall overlaps at least partially with the first side portion, the second side wall overlaps at least partially with the second side portion and a gap formed between distal ends of the first side wall and the second side wall overlaps at least partially with the corner portion of the base member.
This preferred embodiment is at least partially based on the idea that due to manufacturing reasons, it is of advantage to have an opening extending through the base portion of the base member. For example, in order to mount electronic components on a PCB connected to a bottom side of the base member. The opening, however, would reduce the shielding performance. Thus, in order to not reduce the shielding performance of the shield device, the shield device includes a cover member arranged on top of the base member. The preferred embodiment is further based on the idea that although the cover member may have a gap between adjacent side walls, for example due to a bending process of the cover member, this gap is closed at least partially by an at least partial overlap with the corner portion of the base member. The preferred embodiment therefore produces not only a shield device with an increased shielding performance but also a shield device that allows for an easy and cost-effective mounting of electronic components on a PCB.
Exemplary embodiments of the invention are described by the accompanying drawings, which are incorporated herein and constitute a part of the specification. In 20 the drawings: FIG 1 is a schematic view of an electromagnetic interference shield device according to a first embodiment of the present invention, FIG 2 is a detailed schematic view of a corner configuration of the electromagnetic interference shield device of FIG 1, FIG 3 is a schematic view of an electromagnetic interference shield device according to a second embodiment of the present invention, FIG 4 is another schematic view of the electromagnetic interference shield device according to the second embodiment of the present invention, and FIG 5 is a detailed schematic view of the electromagnetic interference device according to the second embodiment of the present invention.
Within this disclosure, the same reference numbers refer to the same components.
FIG 1 shows an electromagnetic interference shield device 10 according to a first embodiment of the present invention. Shield device 10 includes a base member 12. Base member 12 may be a sheet metal having a thickness in a range of about 0.1 mm to about 0.8 mm. Base member 12 includes a base portion 14 which is extending within a base plane 16. In the exemplary embodiment shown, base plane 16 extends essentially horizontally.
Base member 12 further includes a first side portion 18 and a second side portion 20 adjacent first side portion 18. First side portion 18 is integrally formed with base portion 14 and extends within first plane 22 extending essentially perpendicular to base plane 16. First side portion 18 may be bent along an axis such that, after bending, first side portion 18 extends essentially perpendicular to base portion 14. Second side portion 20 is also integrally formed with base portion 14 and extends within second plane 24. Second plane 24 extends essentially perpendicular to first plane 22 and perpendicular to base plane 16. Second side portion 20 may be bent along another axis such that, after bending, second side portion 20 extends essentially perpendicular to base portion 14 and essentially perpendicular to first side portion 18. First side portion 18 and second side portion 20 are therefore arranged in a kind of corner configuration.
Referring now to FIG 2, a detailed schematic view of the corner configuration of FIG 1 is shown.
As can be seen in FIG 2, base member 12 not only includes base portion 14, first side portion 18 and second side portion 20. Base member 12 further includes a corner portion 26. Corner portion 26 is configured to almost entirely close a gap between first side portion 18 and second side portion 20 that would otherwise result during a bending process of base member 12.
Corner portion 26 includes a first planar section 28 and a second planar section 30.
First planar section 26 extends within first plane 22. First planar section 28 is integrally formed with first side portion 18. In other words, first planar section 28 is a kind of extension of first side portion 18 extending within first plane 22. As can be further seen, second planar section 30 extends within second plane 24. Second planar section 30 is thus aligned with second side portion. First planar section 28 transitions into second planar section 30 via a curved section 32. Curved section 32 is interconnected between first planar section 28 and second planar section 30. In addition, curved section 32 is integrally formed with first planar section 28 and second planar section 30. Curved section 32 allows for a smooth transition between first planar section 28 and second planar section 30 such that first planar section 28 can align with first plane 22 and second planar section 30 can align with second plane 24. As first planar section 28 is integrally formed with first side portion 18, as curved section 32 is integrally formed with first planar section 28 and as second planar section 30 is integrally formed with first planar section 28, base member 12 may be bent along a further axis to basically form corner portion 26.
As can be further seen in FIG 2, curved section 32 of corner portion 26 includes a radius 34, more precisely an inner radius. Radius 34 is in a range of about 0.1 mm to about 0.8 mm which is the thickness of the sheet metal of base member 12. Radius 34 is a result of the additional bending process that forms corner portion 26. Radius 34 is also the smallest radius feasible for a given thickness of the sheet material of base member 12. Radius 34 ensures the smooth transition from the first planar section 28 to the second planar section 30.
As can be also seen in FIG 2, second planar section 30 is selected such that a gap is formed between an end face 36 of second planar section 30 and an end face 38 of second side portion 20. Second planar section 30 is selected such that the gap between these opposite end faces 36, 38 is less than 1 mm, preferably less than 0.5 mm, more preferably less than 0.2 mm. A gap of less than 1 mm, preferably less than 0.5 mm, more preferably less than 0.2 mm, ensures that any electromagnetic transmission through the gap between opposite end faces 36 and 38 is effectively minimized, resulting in a sufficiently high and improved electromagnetic shielding performance.
As already mentioned, due to the bending process of the sheet metal, the gap between end faces 36 and 38 may vary slightly. Thus, it is possible that after bending, end faces 36, 38 may abut each other at least partially.
Referring again to FIG 1, it can be seen that first side portion 18 is not only connected to a single corner portion 26 but is connected to two corner portions 26.
These two corner portions 26 are essentially connected to opposite distal ends of first planar portion 18. That is, a respective first planar section of a respective corner portion 26 is integrally formed with a respective end portion of first side portion 18, as indicated in FIG 1. This kind of arrangement reduces complexity during the bending process. Thus, it is possible to first bend second side portion 20 so that second plane 24 extends perpendicular to base plane 16. In a second step, opposite end portions of first side portion 18 are bent such that the two corner portions 26 are formed. During the second step, first side portion 18 still aligns with base plane 16 of base portion 14, i.e. is not bent relative to base portion 14. Then, in a third step, first side portion 18 is bent along a further axis with respect to base portion, so that first plane 22 extends perpendicular to base plane 16. As a result, corner portions 26 align with the second side portion 20 forming the gap of less than 1 mm, preferably less than 0.5 mm, more preferably less than 0.2 mm.
Referring now to FIG 3, a schematic view of electromagnetic interference shield 25 device 10 according to a second embodiment of the present invention is shown.
In the second embodiment of the present invention, base portion 14 of base member 12 includes an opening 40. Opening 40 extends through base portion 14 so that electronic components can be mounted through opening 40 on, for example, a PCB connected to a bottom side of base member 12. Opening 40 makes mounting of electronic components easier but reduces shielding performance. Thus, in order to not loose shielding performance, shield device 10 according to the second embodiment of the present invention includes a cover member 42 which is configured to be arranged on top of base member 12 and essentially closes opening 40.
Referring now to FIG 4, cover member 42 is shown. Cover member 42 is placed on 5 top of base member 12 and closes opening 40. Shield device 10 according to the second embodiment of this invention is a two-part shield device, wherein base member 12 is essentially a frame member covered by cover member 42 Referring now to FIGS, a detailed schematic view of shield device 10 according to the second embodiment of the present invention is shown. As can be seen, cover member 42 is arranged on top of base member 12. Cover member 42 further includes a base wall 44, a first side wall 46 and a second side wall 48 adjacent first side wall 46. First side wall 46 and second side wall 48 extend perpendicular to each other and each extend perpendicular to base wall 44 forming a corner configuration.
Again, cover member 42 may be a bent sheet metal.
As can be clearly seen in FIG 5, due to the bending process a gap 50 is formed between distal ends 52 of first and second side wall 46, 48. Once cover member 42 is placed and arranged on top of base member 12, gap 50 is, however, at least partially overlapped with corner portion 26. Thus, even though gap 50 exists, due to the at least partial overlap with corner portion 26, transmission of electromagnetic radiation waves through gap 50 is essentially minimized and shielding performance losses due to gap 50 are cut to a minimum.
Electromagnetic interference shield device 10 provides a high shielding performance and uses a dedicated corner portion 26 to reduce a gap which would otherwise be formed between first and second side portions 18, 20.
As indicated in FIGs 1 to 5, base member 12 may be a rectangular base member having essentially two first side portions 18 and two second side portions 20 arranged opposite to each other 12. A corner portion 26 is arranged in between respective pairs of first and second side portions 18, 22 to form a corner configuration on every corner of base member 12. In addition, and as already mentioned with reference to FIG 1, two corner portions 26 may be connected on opposite ends of every first side portion 18, allowing for a less complex and more cost-effective bending process when producing electromagnetic interference shield device 10.
Claims (4)
- Patent claims 1. An electromagnetic interference shield (10) device comprising: - a base member (12) including: a base portion (14) extending within a base plane (16), a first side portion (18) integrally formed with the base portion (14) and extending within a first plane (22) perpendicular to the base plane (16), - a second side portion (20) integrally formed with the base portion (14) and extending within a second plane (24) perpendicular to the first plane (22) and perpendicular to the base plane (16), and a corner portion (26) including a first planar section (28) extending within the first plane (22) and a second planar section (30) extending within the second plane (24), wherein the first planar section (28) transitions into the second planar section (30) via a curved section (32), wherein - the first planar section (28) is integrally formed with the first side portion (18) and an end face (36) of the second planar section (30) and an end face (38) of the second side portion (24) form a gap of less than 1 mm between them.
- 2. The shield device (10) of claim 1, wherein the base member (12) includes a further corner portion (26) and the first planar section of the further corner portion (26) and the first planar section (28) of the corner portion (26) are integrally formed on opposite ends of the first side portion (18).
- 3. The shield device (10) of any one of claims 1 or 2, wherein the curved section (32) includes a radius (34) in a range of about 0.1 mm to about 30 0.8 mm
- 4. The shield device (10) of any one of claims 1 to 3, wherein the base portion (14) includes an opening (40) extending through the base portion (14) and the shield device (10) further comprises: a cover member (42) arranged on top of the base member (12), wherein the cover member (42) includes a base wall (44), a first side wall (46) and a second side wall (48) adjacent the first side wall (46), the first side wall (46) extending perpendicular to the second side wall (48) and the first side wall (46) and the second side wall (48) each extending perpendicular to the base wall (44), wherein, when the cover member (42) is arranged on top of the base member (12), the first side wall (46) overlaps at least partially with the first side portion (18), the second side wall (48) overlaps at least partially with the second side portion (20) and a gap (50) formed between distal ends (52) of the first side wall (46) and the second side wall (48) overlaps at least partially with the corner portion (26).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2018617.7A GB2601333A (en) | 2020-11-26 | 2020-11-26 | Electromagnetic interference shield device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2018617.7A GB2601333A (en) | 2020-11-26 | 2020-11-26 | Electromagnetic interference shield device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB202018617D0 GB202018617D0 (en) | 2021-01-13 |
| GB2601333A true GB2601333A (en) | 2022-06-01 |
Family
ID=74099697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2018617.7A Pending GB2601333A (en) | 2020-11-26 | 2020-11-26 | Electromagnetic interference shield device |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2601333A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5608188A (en) * | 1994-09-02 | 1997-03-04 | Motorola, Inc. | Multi compartment electromagnetic energy shield |
| EP1890526A1 (en) * | 2006-08-18 | 2008-02-20 | Research In Motion Limited | Handheld electronic device including multi-compartment shielding container and associated methods |
| EP1951021A1 (en) * | 2007-01-25 | 2008-07-30 | Laird Technologies, Inc. | Electromagnetic interference shielding apparatus and methods of making the same |
| EP2285200A1 (en) * | 2009-08-07 | 2011-02-16 | Cinterion Wireless Modules GmbH | One-piece shielding hood with one or more pins |
| CN110461138A (en) * | 2019-08-02 | 2019-11-15 | 华为技术有限公司 | Circuit board assemblies and electronic equipment |
-
2020
- 2020-11-26 GB GB2018617.7A patent/GB2601333A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5608188A (en) * | 1994-09-02 | 1997-03-04 | Motorola, Inc. | Multi compartment electromagnetic energy shield |
| EP1890526A1 (en) * | 2006-08-18 | 2008-02-20 | Research In Motion Limited | Handheld electronic device including multi-compartment shielding container and associated methods |
| EP1951021A1 (en) * | 2007-01-25 | 2008-07-30 | Laird Technologies, Inc. | Electromagnetic interference shielding apparatus and methods of making the same |
| EP2285200A1 (en) * | 2009-08-07 | 2011-02-16 | Cinterion Wireless Modules GmbH | One-piece shielding hood with one or more pins |
| CN110461138A (en) * | 2019-08-02 | 2019-11-15 | 华为技术有限公司 | Circuit board assemblies and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| GB202018617D0 (en) | 2021-01-13 |
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