WO1997011592A1 - Rf shield for circuit card - Google Patents
Rf shield for circuit card Download PDFInfo
- Publication number
- WO1997011592A1 WO1997011592A1 PCT/US1996/014711 US9614711W WO9711592A1 WO 1997011592 A1 WO1997011592 A1 WO 1997011592A1 US 9614711 W US9614711 W US 9614711W WO 9711592 A1 WO9711592 A1 WO 9711592A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- casing
- fingers
- side walls
- shield
- circuit card
- Prior art date
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
- H05K9/003—Shield cases mounted on a PCB, e.g. cans or caps or conformal shields made from non-conductive materials comprising an electro-conductive coating
Definitions
- This invention relates to electromagnetic shielding problems confronting radio frequency circuits. More particularly, the invention relates to a manufacturable shielding enclosure for circuit cards which emit unwanted electromagnetic radiation.
- a metallized plastic RFI/EMI shield is provided against electromagnetic energy for a circuit card
- the shield is formed of a box enclosure with two casing halves to enclose the card, the first casing half having a solid flange side walls surrounding the card and the second casing half having a flange formed by flat, plate- like closely-spaced fingers, the fingers confronting, being in electrical contact with and mating in full length with substantially the entire periphery of the side walls of the first casing half.
- the fingers are preferably spaced with a 4 this embodiment, closely-spaced protrusions 30 or pins are disposed along the inward faces of the walls 120 and which mate with indentations in the first casing half 10.
- the alternative is also equivalent.
- the perforations 34 must be plated-through or the periphery must be edge plated to form a grounded boundary at and along the edge of the circuit card 32.
- the protrusions 30 provide a conductive path between the casing halves and the circuit card at the isolation walls 120 and 20 and along the inside of the flange 14. This structure further enhances internal as well as external r.f. shielding.
- FIG. 2 there is a perspective view of a second casing half 24 of an r.f shield according to the invention. Together the casing halves 10 and 24 form an effective box enclosure r.f. shield according to the invention.
- the second casing half 24 mates intimately with the first casing half 10 to form the desired level of shielding.
- the structure of the second casing half 24 is instructive.
- a second flange 26 all along the periphery which is formed of closely-spaced fingers 28.
- the fingers 28 are generally flat, flexible plates wherein the inwardly-disposed surface conforms closely with the contour of the outer surface of the flange 16 of the mating first casing half 10.
- the fingers 28 and the flange 16 slidably contact one another when the two casing halves are mated.
- the fingers 28 extend into the optional slot 18 to establish the circuitous path for r.f.
- the fingers 28 are closely spaced to one another, typically having narrow slots with side-to-side spacing of far less than a quarter wavelength. Preferably the spacing is less than 1/4 wavelength of the highest measurable harmonic of the operating frequency of the fundamental of the r.f. emission. A typical spacing is 1/4 wavelength at the tenth harmonic (1/8 wavelength of the fifth harmonic) .
- the narrow spacing has been found to be adequate to provide an effective r.f. seal to the edges which providing a good mechanical slide fit.
- the plate-like fingers 28 produce a flexible, self- sustaining lateral pressure fit against the solid flange 14.
- the material forming the shield may be metal or metallized plastic, that is, plastic coated or plated with copper and nickel.
- the copper provides electromagnetic shielding and the nickel provides abrasion resistance.
- Various processes are known in the art to achieve a substantially uniform effective coating.
- the enclosure is for enclosing a circuit card 32 (in phantom in Fig. 2) wherein the circuit card 32 conforms with the enclosure.
- the second casing half 24 is provided with isolation walls 120 which align with the isolation walls 20 of the opposing half.
- said electromagnetic circuit card has a plated periphery and further including a plurality of closely-spaced pins mating to said periphery and protruding from said first casing into said second casing through said periphery.
- said electromagnetic circuit card has a periphery of grounded perforations and said first casing further includes a plurality of closely-spaced pins mating to said perforations and protruding from said first casing into said second casing through said periphery.
- a shield against electromagnetic energy for an electromagnetic circuit card comprising: a box enclosure for said electromagnetic circuit card, said box enclosure having a first casing and a second casing, said second casing being formed of metallized plastic, said first casing having a solid first flange of a first contour defining side walls surrounding said electromagnetic circuit card and said second casing having a second flange of a second contour defining side walls, wherein said second contour is formed by closely-spaced fingers, said fingers confronting, being in electrical contact with and mating in full length with said first contour along substantially the entire periphery of said side walls, wherein said fingers are flat plates having a face for flexibly confronting said first contour and are spaced from one another at a distance substantially less than 1/4 wavelength of a measurable harmonic of a fundamental operating frequency of said electromagnetic circuit
- said first casing further includes a lip disposed in parallel to said side walls to define a receiving slot for said fingers.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96931560A EP0852108A4 (en) | 1995-09-22 | 1996-09-11 | Rf shield for circuit card |
JP9512792A JPH11511595A (en) | 1995-09-22 | 1996-09-11 | High frequency shield for circuit card |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US419795P | 1995-09-22 | 1995-09-22 | |
US60/004,197 | 1995-09-22 | ||
US08/569,403 | 1995-12-06 | ||
US08/569,403 US5774344A (en) | 1995-12-06 | 1995-12-06 | RF shield for circuit card having a solid first flange |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997011592A1 true WO1997011592A1 (en) | 1997-03-27 |
Family
ID=26672740
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1996/014711 WO1997011592A1 (en) | 1995-09-22 | 1996-09-11 | Rf shield for circuit card |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0852108A4 (en) |
JP (1) | JPH11511595A (en) |
CN (1) | CN1196870A (en) |
CA (1) | CA2231150A1 (en) |
MX (1) | MX9802266A (en) |
WO (1) | WO1997011592A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001013694A1 (en) * | 1999-08-13 | 2001-02-22 | Detewe-Deutsche Telephonwerke Ag & Co. | Screen that prevents the penetration of electromagnetic radiation |
US8362370B2 (en) | 2007-11-26 | 2013-01-29 | Nec Display Solutions, Ltd. | Electronic circuit board and electronic circuit board shield method and construction |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6443768B1 (en) * | 2001-09-14 | 2002-09-03 | Molex Incorporated | Small form factor connector cage |
CN101166412B (en) * | 2006-10-16 | 2011-11-30 | 英华达(上海)电子有限公司 | A manufacturing method for shielding cover and shielding cover manufactured based on this method |
CN102122766A (en) * | 2010-12-24 | 2011-07-13 | 向荣集团有限公司 | Connector of tubular bus bar |
KR20170019023A (en) * | 2015-08-10 | 2017-02-21 | 에스케이하이닉스 주식회사 | Semiconductor package including EMI shielding and manufacturing method for the same |
CN206251571U (en) * | 2016-11-30 | 2017-06-13 | 广州视源电子科技股份有限公司 | Electrostatic screen device |
CN109392295A (en) * | 2017-08-03 | 2019-02-26 | 深圳市道通智能航空技术有限公司 | Electromagnetic armouring structure and electronic equipment with this electromagnetic armouring structure |
KR20200114709A (en) * | 2019-03-29 | 2020-10-07 | 엘지전자 주식회사 | Substrate structure and method the same |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5354951A (en) * | 1993-03-15 | 1994-10-11 | Leader Tech, Inc. | Circuit board component shielding enclosure and assembly |
-
1996
- 1996-09-11 EP EP96931560A patent/EP0852108A4/en not_active Withdrawn
- 1996-09-11 CA CA 2231150 patent/CA2231150A1/en not_active Abandoned
- 1996-09-11 CN CN 96197100 patent/CN1196870A/en active Pending
- 1996-09-11 WO PCT/US1996/014711 patent/WO1997011592A1/en not_active Application Discontinuation
- 1996-09-11 JP JP9512792A patent/JPH11511595A/en active Pending
-
1998
- 1998-03-23 MX MX9802266A patent/MX9802266A/en unknown
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5354951A (en) * | 1993-03-15 | 1994-10-11 | Leader Tech, Inc. | Circuit board component shielding enclosure and assembly |
Non-Patent Citations (1)
Title |
---|
See also references of EP0852108A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001013694A1 (en) * | 1999-08-13 | 2001-02-22 | Detewe-Deutsche Telephonwerke Ag & Co. | Screen that prevents the penetration of electromagnetic radiation |
US8362370B2 (en) | 2007-11-26 | 2013-01-29 | Nec Display Solutions, Ltd. | Electronic circuit board and electronic circuit board shield method and construction |
Also Published As
Publication number | Publication date |
---|---|
CA2231150A1 (en) | 1997-03-27 |
JPH11511595A (en) | 1999-10-05 |
CN1196870A (en) | 1998-10-21 |
MX9802266A (en) | 1998-11-29 |
EP0852108A4 (en) | 1999-05-26 |
EP0852108A1 (en) | 1998-07-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5774344A (en) | RF shield for circuit card having a solid first flange | |
US5165055A (en) | Method and apparatus for a PCB and I/O integrated electromagnetic containment | |
US4567317A (en) | EMI/RFI Protected enclosure | |
US6037846A (en) | Surface mount EMI gasket filter | |
US6821149B2 (en) | Electrical connector having improved shielding member and method of making the same | |
US6624432B1 (en) | EMI containment apparatus | |
US5696669A (en) | Shielding system for PC cards | |
US5959244A (en) | Front and rear contacting EMI gasket | |
US5083945A (en) | Shielded electrical connector assembly | |
US5724234A (en) | Slotted shield can | |
EP0090539A2 (en) | Shielded connector | |
EP0608418A4 (en) | Cartridge for electronic apparatus. | |
US6320122B1 (en) | Electromagnetic interference gasket | |
US9831612B1 (en) | High speed electrical connector with improved EMI suppression and mechanical retention shield | |
GB2420911A (en) | RF shielding liner having protrusions | |
EP0852108A1 (en) | Rf shield for circuit card | |
ZA200605484B (en) | Electronic apparatus and enclosure employing substantially co-planar portions with mating crenellations | |
US5610368A (en) | Clip plate bulkhead mounting for EMI filters | |
US5170321A (en) | Enclosure system for environmental isolation of RF circuitry | |
US8462519B2 (en) | Method of shielding a circuit board, circuit board, electromagnetic shield and method of manufacturing same | |
US5682299A (en) | PCMCIA module having multiple point grounding | |
EP0342971B1 (en) | Electric device | |
US6203373B1 (en) | Shielded electrical connector | |
US5686695A (en) | Resilient plate for a computer interface card | |
WO2002052916A1 (en) | Emi and rfi containment enclosure for electronic devices |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 96197100.2 Country of ref document: CN |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CA CN JP MX |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
ENP | Entry into the national phase |
Ref document number: 2231150 Country of ref document: CA Ref document number: 2231150 Country of ref document: CA Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 1997 512792 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: PA/a/1998/002266 Country of ref document: MX |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1996931560 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1996931560 Country of ref document: EP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1996931560 Country of ref document: EP |