EP0852108A1 - Blindage hf pour carte imprimee - Google Patents

Blindage hf pour carte imprimee

Info

Publication number
EP0852108A1
EP0852108A1 EP96931560A EP96931560A EP0852108A1 EP 0852108 A1 EP0852108 A1 EP 0852108A1 EP 96931560 A EP96931560 A EP 96931560A EP 96931560 A EP96931560 A EP 96931560A EP 0852108 A1 EP0852108 A1 EP 0852108A1
Authority
EP
European Patent Office
Prior art keywords
casing
fingers
side walls
shield
circuit card
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.)
Withdrawn
Application number
EP96931560A
Other languages
German (de)
English (en)
Other versions
EP0852108A4 (fr
Inventor
Matthew P. Casebolt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metricom Inc
Original Assignee
Metricom Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US08/569,403 external-priority patent/US5774344A/en
Application filed by Metricom Inc filed Critical Metricom Inc
Publication of EP0852108A1 publication Critical patent/EP0852108A1/fr
Publication of EP0852108A4 publication Critical patent/EP0852108A4/fr
Withdrawn legal-status Critical Current

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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Casings For Electric Apparatus (AREA)

Abstract

Cette invention concerne un blindage en plastique métallisé contre les parasites radioélectriques et électromagnétiques (RFI/EMI) destiné à une carte imprimée (32). Ce blindage est constitué d'une enceinte de type boîte présentant deux moitiés de boîtier conçues pour enfermer ladite carte (32), la première moitié de boîtier comportant des parois latérales à rebord solide entourant ladite carte (32) et la seconde moitié de boîtier (24) présentant un rebord (26) constitué de doigts (28) plats, de type plaque et très rapprochés, lesdits doigts faisant face à sensiblement tout le pourtour des parois latérales de la première moitié de boîtier, pourtour avec lequel ces doigts sont accouplés sur toute leur longueur et en contact électrique. Les doigts (28) sont, de préférence, espacés d'une distance inférieure au quart de la longueur d'onde de toute harmonique mesurable de la fréquence de service voulue, typiquement jusqu'à la dixième harmonique. On peut prévoir une fente (18) destinée à loger les doigts (28) sur le côté extérieur des parois latérales, ainsi que de broches de mise à la masse très rapprochées, réparties sur le pourtour de la carte (32) qui sont disposées d'une moitié de boîtier à l'autre au travers de perforations (34) ayant un revêtement de mise à la masse arrangées le long du bord des parois latérales.
EP96931560A 1995-09-22 1996-09-11 Blindage hf pour carte imprimee Withdrawn EP0852108A4 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US419795P 1995-09-22 1995-09-22
US4197 1995-09-22
US08/569,403 US5774344A (en) 1995-12-06 1995-12-06 RF shield for circuit card having a solid first flange
US569403 1995-12-06
PCT/US1996/014711 WO1997011592A1 (fr) 1995-09-22 1996-09-11 Blindage hf pour carte imprimee

Publications (2)

Publication Number Publication Date
EP0852108A1 true EP0852108A1 (fr) 1998-07-08
EP0852108A4 EP0852108A4 (fr) 1999-05-26

Family

ID=26672740

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96931560A Withdrawn EP0852108A4 (fr) 1995-09-22 1996-09-11 Blindage hf pour carte imprimee

Country Status (6)

Country Link
EP (1) EP0852108A4 (fr)
JP (1) JPH11511595A (fr)
CN (1) CN1196870A (fr)
CA (1) CA2231150A1 (fr)
MX (1) MX9802266A (fr)
WO (1) WO1997011592A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29914661U1 (de) * 1999-08-13 1999-11-11 Detewe-Deutsche Telephonwerke Ag & Co, 10997 Berlin Abschirmung zum Verhindern des Durchtritts elektromagnetischer Strahlung
US6443768B1 (en) * 2001-09-14 2002-09-03 Molex Incorporated Small form factor connector cage
CN101166412B (zh) * 2006-10-16 2011-11-30 英华达(上海)电子有限公司 一种屏蔽盖的制造方法和利用该方法制造的屏蔽盖
JP2009130181A (ja) 2007-11-26 2009-06-11 Ｎｅｃディスプレイソリューションズ株式会社 電子回路基板、電子回路基板のシールド方法および構造
CN102122766A (zh) * 2010-12-24 2011-07-13 向荣集团有限公司 一种管型母线的连接器
KR20170019023A (ko) * 2015-08-10 2017-02-21 에스케이하이닉스 주식회사 전자기 간섭 차폐부를 갖는 반도체 패키지 및 제조 방법
CN206251571U (zh) * 2016-11-30 2017-06-13 广州视源电子科技股份有限公司 静电屏蔽装置
CN109392295A (zh) * 2017-08-03 2019-02-26 深圳市道通智能航空技术有限公司 电磁屏蔽结构及具有此电磁屏蔽结构的电子设备
KR20200114709A (ko) * 2019-03-29 2020-10-07 엘지전자 주식회사 기판 구조체 및 그 제어 방법

Family Cites Families (1)

* Cited by examiner, † Cited by third party
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 (2)

* Cited by examiner, † Cited by third party
Title
No further relevant documents disclosed *
See also references of WO9711592A1 *

Also Published As

Publication number Publication date
CA2231150A1 (fr) 1997-03-27
WO1997011592A1 (fr) 1997-03-27
MX9802266A (es) 1998-11-29
EP0852108A4 (fr) 1999-05-26
CN1196870A (zh) 1998-10-21
JPH11511595A (ja) 1999-10-05

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