WO1996000995A1 - Ecran de blindage electro-conducteur - Google Patents

Ecran de blindage electro-conducteur Download PDF

Info

Publication number
WO1996000995A1
WO1996000995A1 PCT/US1994/010174 US9410174W WO9600995A1 WO 1996000995 A1 WO1996000995 A1 WO 1996000995A1 US 9410174 W US9410174 W US 9410174W WO 9600995 A1 WO9600995 A1 WO 9600995A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductive
comb
header
shield
openings
Prior art date
Application number
PCT/US1994/010174
Other languages
English (en)
Inventor
Christine M. Foster
Robert F. Traver, Jr.
Original Assignee
W. L. Gore & Associates, 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
Application filed by W. L. Gore & Associates, Inc. filed Critical W. L. Gore & Associates, Inc.
Priority to AU76849/94A priority Critical patent/AU7684994A/en
Publication of WO1996000995A1 publication Critical patent/WO1996000995A1/fr

Links

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
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/71—Coupling devices for rigid printing circuits or like structures
    • H01R12/712—Coupling devices for rigid printing circuits or like structures co-operating with the surface of the printed circuit or with a coupling device exclusively provided on the surface of the printed circuit
    • H01R12/716—Coupling device provided on the PCB
    • 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]
    • H01R13/6581—Shield structure
    • H01R13/6585—Shielding material individually surrounding or interposed between mutually spaced contacts

Definitions

  • a conductive shield with optionally exterior insulative surfaces is provided for use with a right angle header of a high performance connector assembly.
  • the conductive shield may be attached to ground or be left floating so as not to be attached to ground.
  • U.S. Patent 4,914,062 relates to a shielded right angled header having a plurality of signal connecting posts and grounding posts in an evenly ordered pre-arranged manner.
  • Each signal post is incorporated in thermoplastic insulation and covered by a shielding metallic shell.
  • Each metallic shell is also attached to a ground post.
  • the units of the shielded insulated signal post and ground post are held together by a plastic shroud to form a complete header.
  • This type of unit is specifically designed for a particular arrangement of signals and is not adaptable to new arrangements without requiring the redesign of the entire header. No variability is provided.
  • this right-angled header is not easily adaptable to multirow connections.
  • U.S. Patent 4,867,707 relates to a shielded integrated contact connector assembly for coaxial and twin axial cables having housing and retention means for plugging into an array of closely spaced standard male pins in rows of a printed circuit board and other high density grouped signal configurations.
  • This device is designed for a specific application and provides for no variability to suit other applications.
  • Other connectors such as RF connectors provide shields that allow for some variability, all require a connection to ground and do not allow the shield to float. Many of these connectors also require a significant amount of board space.
  • a conductive shield with optional exterior insulative surfaces is provided for mechanical attachment to a connector header having an array of right angled contact and ground pins including: a) a conductive comb having a top, a front face, optional rear wall and sides wherein the front face is provided with a plurality of openings and conductive columns between the openings, b) an insulative comb further including a series of insulating caps that fit within the openings and cover exposed inside surfaces of the columns of the front face, and c) a means of attaching the conductive comb and insulative comb to a connector header wherein the signal and ground pins of the header fit within the individual openings of the combs and are electrically isolated from each other by the insulating caps.
  • the conductive comb is constructed from a material selected from the group including copper, copper alloys and aluminum or from a conductive plastic.
  • the conductive plastic may include an engineering grade thermoplastic such as polyester that has been impregnated with a conductive metal such as copper, nickel, or stainless steel.
  • the insulative comb may be constructed from a thermoplastic material.
  • the means for attaching may include nuts and bolts, screws, and snap-in locks.
  • the conductive comb may optionally be coated with an insulative material such as an epoxy or paint so as to render its exterior surfaces nonconductive.
  • the insulative comb may be a separate component from the conductive comb. Alternatively, the insulative comb may be an integral part of the conductive comb.
  • FIG. 1 is an exploded perspective of the conductive shield with separate insulative comb of the present invention having a four row header and printed circuit board.
  • Figure 1a is a cross-sectional side view of the conductive shield assembly taken across line A-A of Figure 1 wherein line A-A is cut through the contact pins.
  • Figure 1b is a cross-sectional view of the conductive shield assembly taken across line B-B of Figure 1 wherein line B-B is cut through columns between the contact pins.
  • Figure 1c is a front sectional view of the conductive shield assembly shown in Figure 1.
  • Figure 1d is a close up perspective of a means for mounting showing a snap-in design.
  • Figure 1e is a partial top view of the assembled shield and header and front view of where the assembly is attached to a printed circuit board.
  • Figure 2 is an exploded perspective of the conductive shield wherein the insulative comb is an integral part of the shield of the present invention with a four row header and printed circuit board.
  • Figure 3 is an exploded perspective of the conductive shield wherein the insulative comb is an integral part of the shield of the present invention with a two-row header and printed circuit board.
  • Figure 4 is a printout of cross-talk data in a connector having a conventional 2 row header.
  • Figure 5 is a printout of cross-talk data in a connector with the inventive shield and 2 row header.
  • a conductive shield with optionally insulative exterior surfaces is provided for use with a right angle header of a high performance connector assembly.
  • Such a shield is desirable as it facilitates connection without electrical transmission interruption or transmission interference to a female connector with minimal effort or expense. No special treatment is required for the contact pins for use with this shield.
  • this shield can be added to a previously installed header as a means to increase the electrical performance of the header.
  • This shield provides significant flexibility over existing systems as the ground pins do not need to be in a predetermined location so that grounding can be achieved. Rather, this shield allows for the ground pins to be located anywhere in the array of contact pins. Grounding of the shield is optional.
  • Figure 1 shows an exploded view of the shield 2 with conductive comb 12, and a separate insulative comb 4 to be attached to a header 6 and printed circuit board 8.
  • the shield 2 is also provided with means for attaching 10 the assembly to a right angle header 6.
  • the right angle header 6 comprises a housing with an array of right angled signal and ground pins collectively identified as contact pins 26 that are subsequently attached to a printed circuit board 8.
  • the header 6 is a conventional four (4) row right angle header.
  • Figure 3 shows a two row right angle header with the shield 2.
  • the conductive shield comprises a conductive comb 12 having a top surface 3, two sides 5a and 5b, and a front face 7 provided with an upper surface 11 and a plurality of conductive columns or fins 16 located below the upper surface 11.
  • An optional rear wall 9 as shown in Figure 1a may also be provided. Openings 14 in the front face 7 are positioned between each conductive column 16.
  • the top 3, two sides 5a and 5b, optional rear wall 9, and upper front surface 11 may be comprised of a conductive material.
  • the exterior surfaces of the comb 12 may optionally be covered with an insulative coating or paint so as to render the outer surface nonconductive.
  • the top 3, two sides 5a and 5b, optional rear wall 9, and upper front surface 11 may be comprised of a nonconductive material.
  • the columns 16 must be comprised of a conductive material.
  • a separate insulative comb 4 is also provided for the embodiment shown in Figure 1.
  • This insulative comb 4 comprising a series of insulating caps 18 that fit within the openings 14 and over the columns 16 so as to electrically insulate the inner surfaces of the columns 16 from each other.
  • the contact pins 26 are designed to be located within the openings 14 of the combs 12 and 4.
  • the ground pins may be floating (i.e., not touching the surface so as to not be grounded) or may be touching the surface so as to be grounded.
  • the conductive comb 12 is preferably constructed of a conductive material including but not limited to copper, copper alloys, aluminum, and conductive plastics.
  • a conductive material including but not limited to copper, copper alloys, aluminum, and conductive plastics.
  • Preferable plastics include polyetherimides, polyamides, acetals, polycarbonates end engineering grade thermoplastics such as polyethylene terephthalate, polybutylene terephthalate, and liquid crystal polymer. These plastics are rendered conductive by loading or impregnation with metal fillers such as fillers of copper, nickel, or stainless steel.
  • An optional coating of epoxy or paint may cover the side walls 5a and b, top 3, optional rear wall 9 and upper front surface 11.
  • the conductive comb 12 may have sides 5a and b, top 3, optional rear wall 9, and the upper front surface 11 be comprised of a plastic such as those identified above so that these parts of the comb are not conductive.
  • the columns 16 of the front face 7 however must be comprised of a conductive material such as those identified above.
  • the insulative comb 4 is constructed of a nonconductive material such as engineering grade thermoplastics including polyethylene terephthalate, polybutylene terephthalate and liquid crystal polymers.
  • the insulative comb 4 is designed to fit within the spaces between the columns 16 so that the caps 18 of the insulative comb 4 fit snugly against the walls of the columns 16 of the conductive comb and remains intact when the header is then connected to the shield.
  • the insulative comb 4 is necessary to prevent incidental contact between the contact pins 26 and the conductive comb 12 when the system is assembled.
  • the means for attaching 10 in Figure 1 include a mounting bracket 20 and mounting screw 22 that is attached from the header side to a nut 24.
  • the mounting bracket may also be provided with screws for attachment to the printed circuit board 8.
  • the means for attaching 10 may be mounting brackets with a snap-in design wherein the shielded and insulating comb assembly are snapped in place onto the header without the use of additional nuts and bolts.
  • Such an attaching means is shown in Figure 1d.
  • Other means include female threads on the conductive comb 12 so that the bracket can be eliminated thereby providing for the shield to be screwed directly to the header.
  • Figure 1a shows a side view of the assembled system taken along line A-A that cuts through the contact pins.
  • the assembled conductive shield 2 with insulative comb 4 fit adjacent to the header shroud 6 so that the angle of the right angle contact pins 26 are within the openings of the caps 18 of the insulative comb 4.
  • Figure 1b shows a side view of the assembled system taken along line B-B that cuts adjacent the contact pins 26.
  • the insulative face of a cap 18 separates each column of 4 contact pins from each other.
  • Figure 1c shows a front view of the assembly where once again the insulating comb 4 separates and isolates each column of 4 contact pins. Contrary to conventional technology requirements, the ground pins may be located anywhere within the pin column.
  • Figure 2 shows a second embodiment of the invention wherein the conductive shield 2 has an insulative section as integral part of it thus eliminating the need for a separate insulative comb 4.
  • all surfaces of the comb 12' are conductive except for the exposed internal surfaces of the columns 16' and openings 14' which are rendered nonconductive by treating the originally conductive surface. This is accomplished by applying to the surface of the comb a nonconductive material such as epoxy or paint. Conventional coating treatments are suitable and include dip coating, electrostatically applications and painting. These parts may then be heated to cure the insulative layer applied. Alternatively, all surfaces of the shield are treated so as to be rendered nonconductive.
  • the columns 16' are treated so as to have nonconductive surfaces but are internally conductive.
  • a most preferred construction of this embodiment includes a conductive comb 12' constructed from aluminum that has been treated so that all surfaces have an epoxy thermoset coating.
  • any of the conductive materials described above may be used and then treated so that the exterior surfaces are rendered nonconductive.
  • this conductive shield with interior combed nonconductive surface is mounted onto a conventional header by means for attachment 10 such as nuts and bolts, screws, or snap locks.
  • Example A conventional 2 row right angle header was constructed having a specific grounding arrangement for which a specially designed shielding arrangement would be required.
  • Cross-talk without the conductive shield was measured using a pulse generator to drive up to four (4) lines surrounding a quiet line which was sensed using a sampling oscilloscope.
  • a readout of the cross-talk with the standard header but no conductive shield is shown in Figure 4.
  • a conductive shield was made for a two row right angle header.
  • a conductive comb was manufactured from aluminum and had a front face of columns and openings similar to that shown in Figure 3.
  • An insulative comb was molded from polyimide to form a tape having caps and openings to match the columns and openings of the conductive comb and was fitted within the openings and columns of the aluminum comb of the housing.
  • This conductive shield was then attached to a standard right angle header. Testing procedures for measuring cross-talk were identical to those described above and results are shown in Figure 5. As can be seen by comparing Figures 4 and 5, the cross-talk was reduced by 50% with the addition of the conductive shield.

Landscapes

  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

La présente invention concerne un écran de blindage électro-conducteur constitué, d'une part d'un peigne présentant une face avant munie d'ouvertures et de colonnes électro-conductrices, et d'autre part d'un peigne isolant s'adaptant dans les peignes électro-conducteurs de façon à rendre non-électro-conductrices les colonnes électro-conductrices. Ce peigne isolant est fixé sur une embase à angle droit par un dispositif de fixation. Le reste du peigne peut être électro-conducteur, ou, le cas échéant, enduit d'un revêtement ou d'une peinture comportant une substance isolante, de façon à rendre non-électro-conductrices les surfaces extérieures.
PCT/US1994/010174 1994-06-30 1994-09-09 Ecran de blindage electro-conducteur WO1996000995A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU76849/94A AU7684994A (en) 1994-06-30 1994-09-09 A conductive shield

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US26918994A 1994-06-30 1994-06-30
US08/269,189 1994-06-30

Publications (1)

Publication Number Publication Date
WO1996000995A1 true WO1996000995A1 (fr) 1996-01-11

Family

ID=23026175

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1994/010174 WO1996000995A1 (fr) 1994-06-30 1994-09-09 Ecran de blindage electro-conducteur

Country Status (2)

Country Link
AU (1) AU7684994A (fr)
WO (1) WO1996000995A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008040406A1 (fr) * 2006-09-29 2008-04-10 Adc Gmbh ÉLÉMENT de raccordement pour la technique de communication et de l'informatique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4914062A (en) * 1989-02-15 1990-04-03 W. L. Gore & Associates, Inc. Shielded right angled header
US5055069A (en) * 1990-06-08 1991-10-08 E. I. Du Pont De Nemours And Company Connectors with ground structure
EP0460975A1 (fr) * 1990-06-08 1991-12-11 Connector Systems Technology N.V. Connecteurs avec structure de mise à la terre

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4914062A (en) * 1989-02-15 1990-04-03 W. L. Gore & Associates, Inc. Shielded right angled header
US5055069A (en) * 1990-06-08 1991-10-08 E. I. Du Pont De Nemours And Company Connectors with ground structure
EP0460975A1 (fr) * 1990-06-08 1991-12-11 Connector Systems Technology N.V. Connecteurs avec structure de mise à la terre

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008040406A1 (fr) * 2006-09-29 2008-04-10 Adc Gmbh ÉLÉMENT de raccordement pour la technique de communication et de l'informatique

Also Published As

Publication number Publication date
AU7684994A (en) 1996-01-25

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