EP0419331A1 - Abgeschirmtes Gehäuse zum Schutz gegen die Störungen von elektromagnetischen Wellen - Google Patents

Abgeschirmtes Gehäuse zum Schutz gegen die Störungen von elektromagnetischen Wellen Download PDF

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Publication number
EP0419331A1
EP0419331A1 EP19900402545 EP90402545A EP0419331A1 EP 0419331 A1 EP0419331 A1 EP 0419331A1 EP 19900402545 EP19900402545 EP 19900402545 EP 90402545 A EP90402545 A EP 90402545A EP 0419331 A1 EP0419331 A1 EP 0419331A1
Authority
EP
European Patent Office
Prior art keywords
chassis
connector part
shielding
opening
conductive
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.)
Granted
Application number
EP19900402545
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English (en)
French (fr)
Other versions
EP0419331B1 (de
Inventor
Jean-Marie Paladel
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.)
Bull SAS
Original Assignee
Bull SAS
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 Bull SAS filed Critical Bull SAS
Publication of EP0419331A1 publication Critical patent/EP0419331A1/de
Application granted granted Critical
Publication of EP0419331B1 publication Critical patent/EP0419331B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6591—Specific features or arrangements of connection of shield to conductive members
    • H01R13/6596—Specific features or arrangements of connection of shield to conductive members the conductive member being a metal grounding panel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S174/00—Electricity: conductors and insulators
    • Y10S174/35—Box or housing mounted on substrate or PCB

Definitions

  • the present invention relates to a shielding chassis for the protection, against the effects of electromagnetic radiation, of an electrical circuit placed inside this chassis.
  • a peripheral device such as a disk drive
  • a central processing and control unit is housed in a shielding frame different from that in which this is located.
  • central unit this way of operating allowing the operator, when this peripheral device becomes faulty, to proceed quickly to the replacement of this device, without thereby causing a prolonged stop of operation of this central unit.
  • the electrical connection between this peripheral device and this central unit is then ensured by means of a screened conductive cable which, fixed at one of its ends to the own electrical circuits of this device, is provided, at its other end, a shielded connector which allows this cable to be connected to the electrical circuits of this central unit.
  • this shielded connector is, in general, of the type which has been described and represented in the patent of the United States of America n ° 4 337 989, this connector being made up, on the one hand of a first part of connector which, fixed to the end of the screened conducting cable, comprises an insulating body provided housings in which are inserted contact elements of a first type (for example female), these elements being connected to the conductors of the cable, this insulating body being coated with a shielding element electrically connected to the shielding sheath of this cable, on the other hand from a second connector part which, fixed to one of the faces of a circuit board of the central unit, comprises an insulating body provided with housings in which are inserted contact elements d '' a second type (for example male) intended to be brought into contact with the contact elements of the first type when these two connector parts are coupled to each other, these contact elements of the second type being connected és the circuits of the circuit card
  • this second connector part which is mounted on the circuit board so that its coupling face is perpendicular to the plane of this board, is coated, on its face opposite to that which is in contact with this card, as well as on its two lateral faces which are adjacent to its coupling face, of a metal cover which, projecting from the ends of the contact elements which start from this coupling face, makes it possible to form a cavity in which can be engaged the first part of the connector.
  • This cover which thus ensures correct guiding of this first connector part during this engagement, also serves as shielding for the contact elements.
  • this cover is provided with metal tabs which are fixed on conductive areas formed on one of the faces of the circuit card, these conductive areas themselves being electrically grounded.
  • this grounding is obtained by simply connecting these conductive zones to the metal parts which, mounted at inside this chassis, are provided to support this assembly.
  • this chassis is naturally provided with an opening opposite which the second connector part is positioned. , this opening having dimensions greater than those of this first connector part, which allows the operator to conveniently perform, without being hindered, the coupling of these two connector parts.
  • the metal cover which covers the second connector part is further provided with elastic conductive fingers which, when the first connector part is coupled to this second connector part, come into contact with the shielding element of this first part.
  • this shielding element and the cable shielding sheath are both earthed, through, successively , elastic fingers, metal cover, conductive areas of the circuit card, metal parts for fixing this card to the chassis and finally, conductors which normally connect this chassis to earth.
  • the circuit card comprises, in addition to the usual conductors used for the transmission of electrical signals or for the application of electrical potentials of given values, particular conductive zones which allow the shielding cover to on the one hand to be firmly fixed on this card, on the other hand to be electrically connected to the chassis.
  • the presence of these conductive zones has the drawback of requiring a relatively large space on the surface of the card, which leads either to significantly increase the dimensions of this card, or to greatly increase the density of the other conductors implanted. on this one.
  • these conductive areas which are located close to these other conductors, present the risk of being involuntarily brought into contact with them and thus causing short-circuits.
  • the conductive portion of the circuit which is constituted by the shielding element of the first connector part, the elastic fingers, the metal cover, the conductive zones and the metal parts for fixing the card to the chassis, has substantially the form of a loop which is located almost entirely inside the chassis.
  • the present invention overcomes the drawbacks of the prior art and proposes a shielding chassis capable of effectively ensuring the protection, against external electromagnetic radiation, of an electrical circuit which, placed inside this chassis, is connected to a shielded conductive cable outside this chassis, via a connector comprising two complementary parts, one of which, shielded, is fixed to one end of the cable and the another, placed inside the chassis, is connected to this electrical circuit.
  • This effective protection is ensured even in the case where this other connector part is itself coated with a shielding cover connected to the chassis by means of a circuit portion extending inside this chassis.
  • the present invention relates to a shielding chassis intended to ensure the protection, against external electromagnetic radiation, of at least one electrical circuit placed inside this chassis, this chassis being connected to earth and being provided with '' at least one opening for the passage of a first shielded connector part fixed to one end of a shielded electrical cable, so that this first part can be coupled to a second connector part which, complementary to said first part, is connected to said electrical circuit and is placed, inside said chassis, opposite this opening, this chassis being characterized in that it is further provided with an elastic conductive connecting element which is fixed on this chassis so to be moved by the first connector part before the end of the movement made by this first part when it is engaged da ns said opening to be coupled to said second connector part, the displacement undergone by this connecting element allowing the latter to come to bear, under the effect of the elastic deformation undergone, on the shielding element of this first connector part, so that the parasitic currents induced by said electromagnetic radiation pass directly from said shielding element to said chassis without penetrating inside this chassis.
  • the shielding frame 10 which has been partially represented in FIG. 4 essentially consists of a metal case 11 closed at its upper part by a removable cover 12 which can be removed in order to allow access to the interior of the housing.
  • This box contains an electrical circuit which, in the embodiment shown in FIG.
  • this connector 15 which is of the type which has been described and represented in the aforementioned patent of the United States of America No. 4,337,989, comprises two parts, one 15A is fixed to one end of the shielded cable 14 and the other 15B of which is mounted on one of the faces of the circuit card 13.
  • the connector part 15A which has also been shown in FIG. 1, comprises, as can be seen with reference to this last figure, an insulating body 16A, of parallelepiped shape, provided with housings in which are inserted contact elements 17, of female type, which are connected to the electrical conductors 18 of the cable bl indie 14.
  • the insulating body 16A is coated with a shielding element 19 which, as shown in FIG. 4, is in contact with the metallic shielding sheath 20 of the cable 14.
  • the connector part 15B which is represented on the FIG. 4 comprises an insulating body 16B which is provided with housings into which are inserted contact elements 21, of the male type, these contact elements protruding on a coupling face 22 of the insulating body 16B and being established so as to be brought into contact with the contact elements 17 of the connector part 15A when these two parts are coupled to each other.
  • This insulating body 16B is mounted on the circuit card 13 so that its coupling face 22 is perpendicular to the plane of this card. In the example illustrated in FIG.
  • the circuit card 13 is arranged horizontally and, consequently, the insulating body 16B, which is mounted on the upper face of this card, is placed in a position in which its face coupling 22 is vertical.
  • the contact elements 21 pass entirely through the insulating body 16B and, thus projecting from the face 23 of this body which is opposite to the coupling face 22, are extended by portions which are bent at right angles so as to be engaged in holes in the card 13 to be soldered to conductors carried by this card.
  • FIG. 4 also shows that the insulating body 16B is coated, on its upper face and on its two vertical lateral faces which are adjacent to the coupling face 22, with a metal cover 25.
  • This cover which has, in a direction perpendicular to the figure plane, a U-shaped cross section overturned, extends beyond the ends of the contact elements 21 which start from the coupling face 22 and thus defines a cavity 26 which, intended to receive the connector part 15A, ensures the correct guiding of this connector part when the latter is engaged in this cavity to be coupled to the connector part 15B.
  • the cover 25 is provided, at its lower part, with metal tabs 27 which are fixed, by means of screws or by welding, on conductive zones 28 of the circuit board 13, and which allow this cover to be held firmly attached to this card.
  • this opening 30 has dimensions greater than those of the connector part 15A, so that this opening does not hinder the passage of this connector part and allows the operator to carry out conveniently the coupling of the two connector parts 15A and 15B. Furthermore, the continuity of the shielding between the two connector parts 15A and 15B is ensured by elastic conductive fingers which form part of the metal cover 25, these fingers, one of which 31 has been shown in FIG. 4, being formed on the edges of the cover which are located near the open end of the cavity 26 and being folded inwards of this cavity, as indicated in the figure, so as to come to be applied on the shielding element 19 of the connector part 15A which has been introduced into this cavity.
  • this chassis which has great similarities to that of Figure 4, consists of a housing 11 closed by a cover 12 and containing an electrical circuit formed on a circuit board 13.
  • This circuit is intended to be connected to a shielded electrical cable (not shown), of the type shown in FIG. 4, via a connector made up of two parts, one of which 15A, is fixed to one end of this cable, and the other 15B of which is mounted on the circuit board 13.
  • the connector part 15A is similar to that which has been described above. In the embodiment illustrated in FIG.
  • the connector part 15B comprises an insulating body 16B having a recess 26 dimensioned so as to allow the connector part 15A to be engaged with a small clearance in this recess, the bottom of it constituting the coupling face of the connector part 15B.
  • the contact elements 21, of the male type, which protrude on this coupling face 22, are established so as to be brought into contact with the contact elements 17 of the connector part 15A when these two parts 15A and 15B are coupled to each other.
  • the contact elements 21, which pass entirely through the insulating body 16B, protrude from the face 23 of this body which is opposite to the coupling face 22 and are extended by conductive portions which are bent at right angles so as to be able be connected to the conductors of the card 13.
  • Figure 1 shows that the connector part 15B is positioned so that its recess 26 is located opposite the opening 30 of the housing 11, the fixing of this connector part on the card 13 being produced in a known manner, for example by means of screws 32 which, engaged in holes in the card 13, are screwed into corresponding threaded housings of the insulating body 16B.
  • the opening 30 is made so as to have dimensions greater than those of the cross section of the connector part 15A, so that this part can pass without being obstructed by this opening to be coupled to the connector part 15B. This characteristic appears moreover in FIG.
  • the housing 11 is provided with a non-metallic elastic conductive connecting element which, in the example described, is in the form of a membrane 35 , this membrane being fixed on this housing, around the opening 30, so as to come into contact with the shielding element 19 of the connector part 15A when the latter is coupled to the connector part 15B.
  • the membrane 35 is kept applied to the wall of the housing which is close to the opening 30, by means of a hollow plate 36 which is fixed to the housing 11 at the using rivets 37.
  • This membrane 35 is provided with a central opening 38 which, like the opening 30, is rectangular in shape, but has dimensions smaller than those of the cross section of the connector part 15A, this opening 38 being indeed limited by an edge 39 which, as shown in FIG. 2, is located inside the contour formed by the line 33 representative of the position occupied, in opening 30, by this cross section.
  • the portion of this membrane which, around the opening 38, is located on the path followed by this part 15A connector is pushed back into the housing by this connector part and thereby undergoes bending.
  • the membrane 35 since the membrane 35 is elastic, this portion tends to resume its original shape and it therefore comes to be applied, as can be seen in FIG.
  • the shielding element 19 is connected to earth via the membrane 35 and the housing 11. It is then understood that if the housing 11 and the shielded cable 14 which is connected to the electrical circuit contained in this box is located in a region where electromagnetic radiation prevails, the parasitic electric currents which are induced by this radiation in the shielding sheath 20 of this cable circulate, as indicated by the arrows represented in FIG. 3, passing successively through the shielding element 19, the membrane 35 and the housing 11, to finally flow towards the ground. These parasitic currents, which therefore do not circulate in any portion of the circuit located inside the housing 11, are not likely to generate electromagnetic radiation inside this housing.
  • the material which is used to make the membrane 35 is a non-metallic elastic conductive material, that is to say a conductive material which, not being composed entirely of metal, has a significantly higher mechanical flexibility than that of a metal or a metal alloy.
  • This material consists of a conductive elastomer, that is to say an elastomer in which metallic conductive particles have been incorporated, for example silver, gold, nickel or aluminum, the percentage, in volume, of these conductive particles in this elastomer generally being between 30% and 70%.
  • this elastomer preferably consists of a silicone rubber loaded with fine flakes or fine spherical granules of nickel or aluminum, this conductive elastomer having an electrical resistivity not exceeding 0.2 ohm-cm and one elongation at break less than 300%. Furthermore, the thickness of the membrane 35 is between 0.5 and 3 mm, the value preferably adopted being practically equal to 1 mm.
  • this opening 38 is dimensioned so that the distance D which separates its edge 39 from the line 33 representative of the position occupied, in the opening 30, by the cross section of this connector part, is at most equal to 3 mm. It should also be noted that, as can be seen with reference to FIG. 2, the opening 30 of the housing 11 is dimensioned so that its edge 34, which is situated outside the contour formed by this line 33 , is at a very small distance L from this contour, this distance L being in fact at most equal to 3 mm.
  • this resistance is, taking into account the values of r and L mentioned above, at most equal to 0.12 ohm for a membrane having a thickness of 1 mm.
  • the connector part 15B has been established so as to prevent the shielding element 19 of the connector part 15A is connected to the earth by means of the metal parts 29, the housing 11 which has been shown in these two figures 1 and 3 can also be used to protect, against the effects of electromagnetic radiation, the circuits of a card to circuits 13 which would be provided with a connector part 15B similar to that which is shown in FIG. 4.
  • the shielding element 19 of the connector part 15A is then connected to the housing 11, on the one hand via a circuit portion which, located inside this housing, comprises, as we saw above, the elastic fingers 31, the metal cover 25, the tabs 27, the conductive zones 28 and the metal parts 29, on the other hand via the portion of the membrane 35 which is between the edge 34 and the line 33.
  • the portion of the circuit which is located at the interior of the housing has, due to its relatively large length and the reduced section of the fingers 31 and the tabs 27, an electrical resistance of the order of 0.03 ohm.
  • This portion of the circuit also has an impedance due to the inductance resulting from the loop made by the parasitic electric currents, this impedance having a value substantially equal to 0.1 ohm when the frequency of these currents is 10 megahertz and a value close to 1 ohm when the frequency of these currents is 100 megahertz. Since the frequency of these currents is generally greater than 10 megahertz, it can therefore be seen that this portion of the circuit has a total impedance greater than 0.11 ohm.
  • the membrane 35 is made of a silicone rubber loaded with fine particles of nickel or aluminum and having an electrical resistivity at most equal to 0.01 ohm-cm.
  • the portion of the membrane 35 which is between the edge 34 and the line 33 has, taking into account the numerical values indicated above, an electrical resistance at most equal to 0.006 ohm, this portion of the membrane thus having an impedance which is at least 20 times weaker than that of the circuit portion located inside the housing.
  • the housing 11 is provided with several openings , each of these openings being established so as to leave a passage allowing each of these connector parts to be introduced inside the housing to be coupled to a complementary connector part.
  • these openings can be located on the same face of the housing. This has been shown, by way of example, in FIG.
  • one 40 of the enclosure plates of the housing 11 is provided with three openings 30A, 30B and 30C, one of which, 30A, is of rectangular shape, of which another, 30B, is circular, and of which the last 30C, is of square shape, these three shapes corresponding to the shapes of the straight sections of the connector parts intended to be engaged in these openings.
  • these openings are relatively close to one another, it may be advantageous to provide, for these three openings, not three, but only one membrane 35 of elastic conductive material, this membrane being dimensioned so as to extend , when it is fixed to the enclosure plate 40, on all of these three openings, this membrane 35 being itself provided with three openings 38A, 38B, 38C centered, each respectively, on each of the openings 30A, 30B and 30C of the plate 40, in a manner similar to that which is represented in FIG. 2.
  • the opening 38 of this membrane can be produced without requiring rigorous machining tolerances, the only condition necessary for the application of this membrane all around of the shielding element 19 being in fact that the edge 39 of this opening is located inside the contour formed by the line 33 which represents the position occupied, in this opening, by the cross section of this shielding element.
  • the circuit card 13 can be mounted inside the chassis 10 without requiring precise positioning, provided, however, that the condition which has just been stated is observed.

Landscapes

  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
EP90402545A 1989-09-19 1990-09-14 Abgeschirmtes Gehäuse zum Schutz gegen die Störungen von elektromagnetischen Wellen Expired - Lifetime EP0419331B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8912287 1989-09-19
FR8912287A FR2652228B1 (fr) 1989-09-19 1989-09-19 Chassis de blindage pour la protection, contre les effets de rayonnements electromagnetiques, d'un circuit electrique place a l'interieur de ce chassis.

Publications (2)

Publication Number Publication Date
EP0419331A1 true EP0419331A1 (de) 1991-03-27
EP0419331B1 EP0419331B1 (de) 1995-07-19

Family

ID=9385647

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90402545A Expired - Lifetime EP0419331B1 (de) 1989-09-19 1990-09-14 Abgeschirmtes Gehäuse zum Schutz gegen die Störungen von elektromagnetischen Wellen

Country Status (6)

Country Link
US (1) US5064388A (de)
EP (1) EP0419331B1 (de)
JP (1) JPH03149899A (de)
DE (1) DE69020993T2 (de)
ES (1) ES2077658T3 (de)
FR (1) FR2652228B1 (de)

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US5334798A (en) * 1993-01-08 1994-08-02 Allied-Signal Inc. Interconnect cable with built-in shielding and method of use
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JP3271178B2 (ja) * 1995-03-03 2002-04-02 矢崎総業株式会社 金属シールドの接続構造
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US6830465B2 (en) * 2001-08-24 2004-12-14 Adc Telecommunications, Inc. Interconnect chassis and module
US6511330B1 (en) 2001-08-24 2003-01-28 Adc Telecommunications, Inc. Interconnect module
TW585390U (en) * 2002-01-18 2004-04-21 Coretronic Corp Installation slot with a slanted conductive board
MY147054A (en) * 2008-03-07 2012-10-15 Joinset Co Ltd Solderable elastic electric contact terminal
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EP2645510B1 (de) * 2010-11-26 2018-07-11 Mitsubishi Electric Corporation Elektrischer verbinder, zugauskunftssende-/empfangssystem, und verfahren zum anschliessen eines elektrischen verbinders
US8294043B2 (en) * 2010-12-07 2012-10-23 Honeywell International Inc. Integrated connector shield ring for shielded enclosures
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JP5797601B2 (ja) * 2012-04-27 2015-10-21 オートリブ ディベロップメント エービー 車載回路基板収容筐体
JP2014007133A (ja) * 2012-05-28 2014-01-16 Auto Network Gijutsu Kenkyusho:Kk コネクタ
JP2019033011A (ja) * 2017-08-09 2019-02-28 矢崎総業株式会社 機器直付用シールドコネクタの取付構造
JP7314556B2 (ja) * 2019-03-22 2023-07-26 京セラドキュメントソリューションズ株式会社 コネクター

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EP0073112A1 (de) * 1981-08-17 1983-03-02 AMP INCORPORATED (a New Jersey corporation) Ausrüstung für die Umwandlung einer Schalttafelöffnung in eine abgeschirmte Steckdose
DE8419252U1 (de) * 1984-06-27 1984-09-27 Triumph-Adler Aktiengesellschaft für Büro- und Informationstechnik, 8500 Nürnberg Steckverbinder mit Massekontaktierung
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US4571012A (en) * 1984-12-21 1986-02-18 Molex Incorporated Shielded electrical connector assembly

Also Published As

Publication number Publication date
DE69020993T2 (de) 1995-11-23
US5064388A (en) 1991-11-12
DE69020993D1 (de) 1995-08-24
ES2077658T3 (es) 1995-12-01
FR2652228B1 (fr) 1996-05-24
EP0419331B1 (de) 1995-07-19
JPH03149899A (ja) 1991-06-26
FR2652228A1 (fr) 1991-03-22

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