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WO1997032459A1 - Blindage pour panneaux de ventilation d'appareils electroniques et son procede de fabrication - Google Patents

Blindage pour panneaux de ventilation d'appareils electroniques et son procede de fabrication Download PDF

Info

Publication number
WO1997032459A1
WO1997032459A1 PCT/US1997/002782 US9702782W WO9732459A1 WO 1997032459 A1 WO1997032459 A1 WO 1997032459A1 US 9702782 W US9702782 W US 9702782W WO 9732459 A1 WO9732459 A1 WO 9732459A1
Authority
WO
WIPO (PCT)
Prior art keywords
honeycomb
shielding device
electromagnetic shielding
frame
recited
Prior art date
Application number
PCT/US1997/002782
Other languages
English (en)
Inventor
Walter Andrew Peregrim
Original Assignee
The Whitaker Corporation
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
Application filed by The Whitaker Corporation filed Critical The Whitaker Corporation
Priority to JP53103497A priority Critical patent/JP2001503915A/ja
Priority to EP97906734A priority patent/EP0883978A1/fr
Publication of WO1997032459A1 publication Critical patent/WO1997032459A1/fr

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
    • H05K9/0041—Ventilation panels having provisions for screening

Definitions

  • Braised or welded honeycombs must be made from brass or steel and are expensive to manufacture.
  • Glued honeycombs may be made of the less expensive aluminum strips, but the glue in prior art is insulating and provides sufficient conductivity in one direction only.
  • Glued honeycomb joints do not conduct electricity in a direction perpendicular to the strip of foil and can result in electromagnetic leakage.
  • Omnidirectional conductivity provides optimum performance rendering glued joints less desirable than the welded or braised joints. There is a need, therefore for a less expensive electromagnetic interference and emission shielding device for air flow vents.
  • U.S. Patent #5,032,689 discloses conventional EM1/RFI shielding vent filter media including honeycomb structures, woven screen panels and expanded or perforated metal. All structures disclosed are believed to be metal in order to provide the necessary conductive feature. Expanded metal is disclosed as the preferred media. Disadvantageously, it is difficult to easily control the cell sizes and cell depth of the media in expanded metal and woven screen. Cell size and cell depth together determine air flow volume, cut-off frequency, and attenuation at the cutoff frequency. There is a need, therefore, for a filter media capable of cost effective manufacture wherein the cutoff frequency and attenuation may be reliably controlled.
  • a method of manufacturing an electromagnetic shielding device comprises the steps of forming a plastic honeycomb and applying a conductive coating thereto.
  • a method of fabricating an electromagnetic shielding device comprises the steps of forming a plastic honeycomb, cutting the honeycomb to a desired dimension, disposing a frame around a perimeter of the honeycomb and applying a conductive coating to the honeycomb and frame.
  • Figure 1 is a perspective view of a honeycomb comprising an array of polycarbonate tubes according to the teachings of the present invention.
  • Figure 2 is a cross section of the array pictured in Figure 1 of the drawings.
  • Figure 3 is a perspective view of a iTra e and honeycomb for use with an electromagnetic shielding device according to the teachings of the present invention.
  • Figure 4 is a cross sectional view of the frame and honeycomb pictured in Figure 3.
  • the honeycomb (1) comprises an array of polycarbonate tubes (2) as shown in Figure 1, each tube (2) creating a cell of the honeycomb.
  • the tubes (2) are stacked in staggered lines so that each single tube (2) internal to the array has a joint (3) in common with each of six adjacent tubes (2) .
  • the array is formed by cutting polycarbonate tubes (2) to a uniform and appropriate length.
  • the tubeb (2) are vibrated against a planar member. The vibration results in a configuration comprising staggered lines (4) of tubes (2) stacked on top of each other.
  • the center of each tube (2) is collinear with the center of adjacent tubes (2) in a single direction to form the line (4) .
  • the planar member acts as an alignment guide to create a planar face for the honeycomb (1) .
  • the stacked array of loose tubes (2) is captivated to retain alignment and is immersed in a dissolving solution sufficient to partially dissolve the tubes (2) .
  • the array of partially dissolved tubes (2) is removed from the solution and permitted to cure. Curing of the partially dissolved tubes (2) creates the joint (3) at each point on the tube (2) that touches an adjacent tube (2) .
  • the array (1) of tubes resolidifies in fixed relation to each other to create the honeycomb (1) .
  • An embodiment of the honeycomb (l) for use in a preferred embodiment of an electromagnetic shielding device according to the teachings of the present invention is available from
  • honeycomb core Plascore under the name PC Polycarbonate Honeycomb core.
  • the resulting honeycomb (1) can be cut to appropriate dimensions for mounting over an air flow vent in an electronic instrument.
  • the appropriately dimensioned honeycomb (1) fits into a frame (5) that enables mounting of the shielding device over an air flow vent of an electronic instrument for fixed attachment thereto.
  • the frame (5) is substantially rectangular and has mounting holes (6) around the perimeter of the frame (5) .
  • Each side of the frame (5) comprises a length of polycarbonate material extruded to form a C-shaped cross section as illustrated in Figure 4 of the drawings. Distal ends (7) of the C of the cross section are separated by a distance larger than the thickness of the honeycomb (1) .
  • Frame (5) further comprises compression stop (10) and integral gasket (11) .
  • Each of four lengths comprising the sides of the frame (5) are disposed over the honeycomb (1) to complete the structure of the framed shielding device.
  • the honeycomb (1) and frame (5) are then plated with a conductive coating.
  • the honeycomb (1) and frame (5) are preferably plated with a first layer of copper to provide electrical conductivity.
  • the copper plated honeycomb (1) and frame (5) are then plated with a second layer of nickel to resist corrosion.
  • the copper plating provides conductivity in the X and Y directions simultaneously.
  • the coated frame (5) and honeycomb (1) are mounted over an air flow vent using threaded screws (8) in mounting holes (6) .
  • the integral gasket (11) with the conductive coating is interposed between the frame (5) and the chassis of the electronic instrument.
  • integral gasket (11) faces the air flow vent of the electronic instrument and contacts a perimeter of the vent opening. Due to its cantilevered configuration, the gasket (11) is cammed toward the electronic instrument as the mounting screws (8) are tightened.
  • the resulting force of the biased gasket (11) provides a positive contact when the shielding device is mounted to the instrument.
  • the compression stop (10) provides for a positive stop to prevent overstressing the integral gasket (11) .
  • the biased conductive gasket assures conductivity from the honeycomb (1) through the frame and to chassis which is important for effective shielding.
  • a forward facing side (9) of the frame (5) flares outwardly slightly to create a lead-in for the honeycomb (1) .
  • the honeycomb (1) As the honeycomb (1) is forced into the opening of the frame's (5) cross section, the honeycomb (1) enters an area wherein the thickness of the honeycomb is slightly greater than the opening of the C and is compressed. This compression provides a frictional retention between the honeycomb and the frame.
  • the inner diameter of each cell of the honeycomb (1) determines the cut off frequency for which the shielding device may be used.
  • the most desirable inner diameter dimension for the tubes of a shielding device according to the teachings of the present invention is selected based upon the wave length of a desired cut off frequency and the desired attenuation for the cut off frequency.
  • a high cutoff frequency suggests a small inner diameter for each cell.
  • a large volume of air flow necessary to maintain a stable operating temperature suggests a large inner diameter for each cell.
  • a 40dB attenuation at 90 GHz is achieved using a 1/16 inch inner diameter and 2 inch depth for each cell.

Landscapes

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

Abstract

L'invention porte sur un connecteur électrique comportant un boîtier diélectrique présentant une cavité recevant une borne et une ouverture s'étendant dans le boîtier faisant un angle avec la cavité et s'ouvrant dans la cavité; elle porte également sur une borne insérable dans la cavité et présentant une surface de montage de composants conçue pour être alignée avec l'ouverture lorsque la borne est dans la cavité. La borne et la cavité comportent des surfaces complémentaires qui guident la borne lors de son insertion dans la cavité pour éviter que la surface de montage des composants n'entre en contact avec le boîtier lors de l'insertion et empecher la contamination de la surface de montage des composants. L'invention porte enfin sur un procédé de fabrication d'un blindage électromagnétique pour orifices de ventilation d'appareils électroniques consistant à constituer un nid d'abeilles sur lequel on applique un revêtement conducteur.
PCT/US1997/002782 1996-02-28 1997-02-26 Blindage pour panneaux de ventilation d'appareils electroniques et son procede de fabrication WO1997032459A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP53103497A JP2001503915A (ja) 1996-02-28 1997-02-26 電子機器の換気パネル用シールド装置及びその製造方法
EP97906734A EP0883978A1 (fr) 1996-02-28 1997-02-26 Blindage pour panneaux de ventilation d'appareils electroniques et son procede de fabrication

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US60833896A 1996-02-28 1996-02-28
US60834196A 1996-02-28 1996-02-28
US08/608,341 1996-02-28
US08/608,338 1996-02-28

Publications (1)

Publication Number Publication Date
WO1997032459A1 true WO1997032459A1 (fr) 1997-09-04

Family

ID=27085735

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/002782 WO1997032459A1 (fr) 1996-02-28 1997-02-26 Blindage pour panneaux de ventilation d'appareils electroniques et son procede de fabrication

Country Status (3)

Country Link
EP (1) EP0883978A1 (fr)
JP (1) JP2001503915A (fr)
WO (1) WO1997032459A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0843512A3 (fr) * 1996-11-15 1999-07-07 Digital Equipment Corporation Blindage électromagnétique haute fréquence avec aération pour l'enveloppe d'un dispositif électronique
WO1999041963A1 (fr) * 1998-02-17 1999-08-19 Parker-Hannifin Corporation Panneau de ventilation blinde contre les interferences electromagnetiques et procede associe
WO2001013695A1 (fr) * 1999-08-17 2001-02-22 Parker-Hannifin Corporation Panneau d'event de mise a la terre des interferences electromagnetiques
EP1196765A4 (fr) * 1999-06-25 2002-11-13 Venturedyne Ltd Chambre d'essai environnemental
WO2003049521A1 (fr) * 2001-12-04 2003-06-12 Laird Technologies, Inc. Procedes et appareil de blindage emi
US6710241B2 (en) 2002-05-16 2004-03-23 Parker-Hannifin Corporation EMI shielding vent panel
EP2844054A2 (fr) 2013-08-27 2015-03-04 Parker Hannifin Corporation Panneau de ventilation EMI homogène
US9345182B2 (en) 2013-08-27 2016-05-17 Parker-Hannifin Corporation EMI shielding vent panel frame
WO2017048745A1 (fr) * 2015-09-15 2017-03-23 Parker-Hannifin Corporation Évent intelligent à protection contre les interférences électromagnétiques (emi)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016171138A (ja) * 2015-03-11 2016-09-23 株式会社国際電気通信基礎技術研究所 シールド構造体

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3231663A (en) * 1962-11-01 1966-01-25 Schwartz Edward Electromagnetic shield having multiple electroconductive passages
AT364441B (de) * 1980-06-13 1981-10-27 Siemens Ag Oesterreich Elektromagnetische abschirmung fuer durchtrittsoeffnungen
NL8401200A (nl) * 1984-04-13 1985-11-01 Fokker Bv Ventilatie-element voor ventilatie-openingen van elektromagnetisch afgeschermde ruimten.
US5032689A (en) * 1989-08-15 1991-07-16 Halligan Brian S EMI/RFI shielding vent and method of use

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3231663A (en) * 1962-11-01 1966-01-25 Schwartz Edward Electromagnetic shield having multiple electroconductive passages
AT364441B (de) * 1980-06-13 1981-10-27 Siemens Ag Oesterreich Elektromagnetische abschirmung fuer durchtrittsoeffnungen
NL8401200A (nl) * 1984-04-13 1985-11-01 Fokker Bv Ventilatie-element voor ventilatie-openingen van elektromagnetisch afgeschermde ruimten.
US5032689A (en) * 1989-08-15 1991-07-16 Halligan Brian S EMI/RFI shielding vent and method of use

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0843512A3 (fr) * 1996-11-15 1999-07-07 Digital Equipment Corporation Blindage électromagnétique haute fréquence avec aération pour l'enveloppe d'un dispositif électronique
WO1999041963A1 (fr) * 1998-02-17 1999-08-19 Parker-Hannifin Corporation Panneau de ventilation blinde contre les interferences electromagnetiques et procede associe
US6211458B1 (en) 1998-02-17 2001-04-03 Parker-Hannifin Corporation EMI shielded vent panel and method
US6362417B2 (en) 1998-02-17 2002-03-26 Parker-Hannifin Corporation EMI shielded vent panel and method
EP1196765A4 (fr) * 1999-06-25 2002-11-13 Venturedyne Ltd Chambre d'essai environnemental
WO2001013695A1 (fr) * 1999-08-17 2001-02-22 Parker-Hannifin Corporation Panneau d'event de mise a la terre des interferences electromagnetiques
US6426459B1 (en) 1999-08-17 2002-07-30 Parker-Hannifin Corporation EMI shielding vent panel for high volume applications
USRE42512E1 (en) 2001-12-04 2011-07-05 Laird Technologies, Inc. Methods and apparatus for EMI shielding
US6870092B2 (en) 2001-12-04 2005-03-22 Laird Technologies, Inc. Methods and apparatus for EMI shielding
EP1799023A1 (fr) * 2001-12-04 2007-06-20 Laird Technologies, Inc. Procédés et appareils de blindage contre les interférences électromagnétiques
USRE41594E1 (en) 2001-12-04 2010-08-31 Laird Technologies, Inc. Methods and apparatus for EMI shielding
WO2003049521A1 (fr) * 2001-12-04 2003-06-12 Laird Technologies, Inc. Procedes et appareil de blindage emi
US6710241B2 (en) 2002-05-16 2004-03-23 Parker-Hannifin Corporation EMI shielding vent panel
EP2844054A2 (fr) 2013-08-27 2015-03-04 Parker Hannifin Corporation Panneau de ventilation EMI homogène
US9345182B2 (en) 2013-08-27 2016-05-17 Parker-Hannifin Corporation EMI shielding vent panel frame
US9370132B2 (en) 2013-08-27 2016-06-14 Parker-Hannifin Corporation Homogeneous EMI vent panel and method for preparation thereof
WO2017048745A1 (fr) * 2015-09-15 2017-03-23 Parker-Hannifin Corporation Évent intelligent à protection contre les interférences électromagnétiques (emi)
US10477740B2 (en) 2015-09-15 2019-11-12 Parker-Hannifin Corporation Smart EMI vent

Also Published As

Publication number Publication date
EP0883978A1 (fr) 1998-12-16
JP2001503915A (ja) 2001-03-21

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