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EP1195855A2 - Fiche modulaire et son procédé d'accouplement avec des câbles à pairs torsadées - Google Patents

Fiche modulaire et son procédé d'accouplement avec des câbles à pairs torsadées Download PDF

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Publication number
EP1195855A2
EP1195855A2 EP01402400A EP01402400A EP1195855A2 EP 1195855 A2 EP1195855 A2 EP 1195855A2 EP 01402400 A EP01402400 A EP 01402400A EP 01402400 A EP01402400 A EP 01402400A EP 1195855 A2 EP1195855 A2 EP 1195855A2
Authority
EP
European Patent Office
Prior art keywords
wire
modular plug
plug
bared
wires
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Withdrawn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
EP01402400A
Other languages
German (de)
English (en)
Other versions
EP1195855A3 (fr
Inventor
Robert Laes
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.)
Nexans SA
Original Assignee
Nexans SA
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 EP00402750A external-priority patent/EP1195854A1/fr
Application filed by Nexans SA filed Critical Nexans SA
Priority to EP01402400A priority Critical patent/EP1195855A3/fr
Publication of EP1195855A2 publication Critical patent/EP1195855A2/fr
Publication of EP1195855A3 publication Critical patent/EP1195855A3/fr
Withdrawn legal-status Critical Current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
    • H01R13/02—Contact members
    • H01R13/025—Contact members formed by the conductors of a cable end
    • 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
    • H01R13/646—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00 specially adapted for high-frequency, e.g. structures providing an impedance match or phase match
    • H01R13/6473—Impedance matching
    • H01R13/6474—Impedance matching by variation of conductive properties, e.g. by dimension variations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
    • H01R24/60—Contacts spaced along planar side wall transverse to longitudinal axis of engagement
    • H01R24/62—Sliding engagements with one side only, e.g. modular jack coupling devices
    • H01R24/64—Sliding engagements with one side only, e.g. modular jack coupling devices for high frequency, e.g. RJ 45
    • 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
    • H01R13/646—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00 specially adapted for high-frequency, e.g. structures providing an impedance match or phase match
    • H01R13/6461—Means for preventing cross-talk
    • H01R13/6463—Means for preventing cross-talk using twisted pairs of wires

Definitions

  • the present invention relates to a modular plug for a cable having a plurality of wires, the plug comprising a housing with a wire receivable cavity adapted for guiding ends of the cable wires towards a contact end of said modular plug.
  • Such a modular plug is generally known in the art, it is for instance a standardized RJ45 [Registered Jack] data transmission plug widely used in telecommunications and data interconnection systems.
  • a common problem with this kind of plug is to satisfy always-increasing data transmission speeds, while maintaining production costs as low as possible.
  • the design of the modular plug is constantly improved.
  • One of these improvements is for instance described in the European Patent Application EP-A2-0 716 477 by Bofill et al, and entitled "Modular plug for high speed data transmission".
  • a wire holder is provided for being inserted in a cavity of the plug.
  • the wire holder is used for arranging and holding the wires of twisted pairs in a predetermined order and to bring, when inserted in the plug, the ends of the wires in a position proximate to a zone of contact where plug contacts can be connected to the wires.
  • the plug contacts are provided with insulation piercing parts that are pressed to pierce through the insulation of the wires in order to contact the conducting strands thereof.
  • the wires of the pairs are maintained twisted in the wire holder and the length of the straightened or untwisted wire ends is as short as possible.
  • the object thereof is to minimize the well-known cross talk effect caused by electromagnetic interferences between the conductors.
  • the insulation piercing parts are relatively large parallel plates facing each other, thereby creating unwanted high capacitive effects that negatively affect the quality of the connector.
  • the modular plug needs to be produced at relatively low cost.
  • documents US-6 010 371 and US-5 564 951 both describe an electrical connector having a plurality of wires, and comprising a housing with a cavity adapted for guiding the ends of cable wires towards a contact end of the connector.
  • the contact end of the connector is provided with a plurality of grooves adapted for receiving the bared ends of the wires, portions of these bared ends forming contact terminals of the conductor.
  • An object of the present invention is to provide a modular plug of the known type but whereof the production cost is dramatically low while being adapted to achieve a connection to a cable for use in high-speed data transmission applications with reduced cross talk.
  • this object is achieved due to the fact that the contact end of said modular plug is provided with a plurality of grooves adapted for receiving bared ends of said wires, portions of said bared ends forming contact terminals of said modular plug, the angle between each of said portions forming a contact terminal and the portion of said bared end that is located between the portion forming a contact terminal and the insulated part of the wire is less than 90°.
  • the present plug is easier to manufacture than the ones of the prior art.
  • the contact can be made directly at the contact end of the modular plug.
  • the plug of the invention is cost-effective because there is no wire holder required, nor plug contact with insulation piercing parts.
  • the removal of the plug contacts not only reduces dramatically the production cost of the modular plug, but also reduces the cross talk effect. Indeed, the plug contacts comprising the insulation piercing parts and constituted by relatively large metallic plates facing each other with a close spacing, resulting in large capacitors, are no longer present.
  • the wire receivable cavity is only used for guiding the ends of the wires towards the contact end of the plug, the length of this cavity may be reduced to a minimal value to reduce even more the unwanted cross talk effect.
  • the angle between the portion of said bared end located between the portion forming a contact terminal and the insulated part of the wire, and said insulated part of the wire is less than 90°.
  • said housing has a fixed part and a removable part, said fixed part having a first wall of the plug housing cavity and said removable part having a second wall, opposite to said first wall, of said plug housing cavity, said first and second walls being adapted to cooperate for holding the wire ends into said plug housing cavity.
  • the ends of the cable may be prepared to fit exactly into the modular plug and to be positioned into the fixed part of the plug prior to mount the removable part there over. This is preferable than inserting by sliding the several straightened wire ends into the wire receivable cavity and then pushing these ends into the grooves while watching that the correct wire order is maintained.
  • said housing is further provided with a plurality of blind holes substantially orthogonal to said grooves, said holes being located at ends of the grooves and being adapted for receiving tips of the bared wire ends.
  • the bared wire ends are so maintained with a tight fit in the grooves between the plug housing cavity and the blind holes. By holding the tips of the wires in the holes, these wires are prevented to move within the grooves and the quality of the contact terminals created thereby is increased.
  • each wire of the cable is an insulated single conductor wire.
  • Single conductor wires are preferred over braided multi-conductor wires because of their rigidity used to constitute contact terminals.
  • Another object of the present invention is to provide a cost effective method of coupling a cable, e.g. with twisted wire pairs, to a modular plug according to the invention in order to provide an arrangement having a relatively low cross talk effect and thus usable in high speed applications.
  • the housing of said modular plug has a fixed part and a removable part, and said method comprises further steps of:
  • the wire ends may be prepared to fit exactly into the fixed part of the modular plug, with the bared portion fitting into the grooves.
  • the next and final step is then to mount the removable part over the positioned wires. This is easier than inserting the many wire ends into the wire receivable cavity and then pushing the straightened wire ends into the grooves.
  • Another characterizing embodiment of the present invention is that said method further comprises steps of:
  • the bared wire ends are prevented to move within the grooves and the quality of the contact terminals is increased.
  • the modular plug of which a longitudinal cross-section sided view is represented at Fig. 1 is of the standardized type RJ45 [Registered Jack].
  • Such a modular plug is widely used in telecommunications and computer interconnection systems for ending cables adapted for the transmission of high speed data.
  • the plug is designed to satisfy the requirements of the Categories 5, 6 and 7 standards and the cables generally, but not necessarily, comprise several twisted pairs of wires.
  • An example thereof is the known UTP [Unshielded Twisted Pair] cable comprising for instance eight wires arranged in four pairs of two twisted wires each.
  • the contacts terminals of the plug, adapted to be engaged within a cooperating receiving jack, are formed by bared portions of the cable or wire conductors themselves, as will become clear from the description below.
  • the modular plug has a housing with a receivable cavity 1 adapted to receive untwisted ends of the wire pairs of the cable between a lower wall 2 and an upper wall 3.
  • the plug housing cavity 1 ends with an opening 4 extending to the bottom part of the plug.
  • the opening 4 is almost as large as the plug and ends at grooves generally indicated by an arrow 5, separated from each other by walls 13 as shown in Fig. 3 and located on the bottom of the plug.
  • the grooves 5 are parallel to each other and extend from the opening 4 to the front end of the plug at the left of Figs. 1 and 2.
  • the grooves 5 are adapted to receive bared ends 14 of the wires that will form the contacts of the plug.
  • eight grooves are provided at the bottom of the plug.
  • the walls 13 are used to hold the bared ends 14 of the wires in the cavity 1 as well as to guide the contacts of the jack (not shown) during its insertion in the plug.
  • a blind hole such as 6, is made in each of the grooves.
  • the holes are upward with respect to the Figs. 1 and 3 and the diameter of these holes is chosen to accommodate the insertion of the bared cable conductor.
  • FIG. 4 A longitudinal cross-section sided view of an assembly comprising the plug and the wires is shown at Fig. 4.
  • the wires of the cable are untwisted and arranged in an horizontal plane prior to be engaged in the plug housing or wire receivable cavity 1.
  • the end of the insulated part of each wire generally indicated by numeral 7, abuts against the end of the cavity and is maintained between the walls 2 and 3 delimiting the wire receivable cavity 1.
  • the bared ends 14 of the wires 7 are engaged in the opening 4 at the end of the cavity 1 and are so guided between walls 13 towards the bottom grooves 5.
  • Straightened portions 8 of these bared wire ends are then engaged with a tight fit into the grooves 5 and their tips 12 are inserted in the holes 6.
  • the straightened bared portions 8 of the wires are so prevented to move within the grooves 5.
  • These straightened bared portions 8 of the wires form the contact terminals of the plug.
  • the angle ⁇ between the straightened bared portion 8 that forms the contact terminal of the plug and the portion 11 of the bared wire that is located between this straightened bared portion 8 and the insulated part of the wire 7 is less than 90° as illustrated in Fig. 4. This avoids too long parallel lengths of bared wire ends within the plug, that would increase the capacitive effect in the plug.
  • the angle ⁇ should be as small as possible and the length of the straightened bared portion 8 as short as possible in order to minimize the length of the bared wires that are in parallel to each other.
  • the angle ⁇ between the tip 12 of the bared portion 14 and the straightened bared portion 8 that forms the contact terminal is less than 90°, and preferably as small as possible but sufficient to ensure good retention of the wire tip 12 in the hole 6.
  • the modular plug is constituted by a fixed part 9 and a removable part 10.
  • the fixed part 9 of the plug of which a longitudinal cross-section side view is represented at Fig. 5, comprises almost all the items of the plug except the lower wall 2 of the plug housing cavity 1.
  • This lower wall 2 belongs to the removable part 10 of the plug as shown at Fig. 6.
  • the wires may be pre-formatted to mate the shape of the fixed part 9 of the plug.
  • Such a prepared wire 7 is shown at Fig. 7 with its bared portion having a straightened part 8 adapted to form a contact terminal of the plug.
  • the prepared wires of the cable are then placed into the fixed part 9 of the plug, as indicated by an arrow between the Figs. 7 and 5, and the wire tips 12 are engaged in the holes 6.
  • the removable part 10 is then afterwards placed onto the fixed part 9, as indicated by an arrow between the Figs. 6 and 7, in order to maintain the insulated parts of the wires between the walls 3 and 2 as for the plug shown at Fig. 4.
  • the opening 4' of the cavity 1' is such that the portion 8' of the wire that forms the contact terminal of the plug is a curved portion linked to the insulated part of the wire 7 by a straightened portion 11'; according to the invention, the angle ⁇ ' between the straightened portion 11' and the curved portion 8' is 45° or less, and at least less than 90° while the straightened bare portion 11' is as short as possible for the same reasons as mentioned above.
  • the angle ⁇ ' between the tip 12 of the bared portion 14' and the straightened bared portion 11' that forms the contact terminal is less than 90°, and preferably as small as possible but sufficient to ensure good retention of the wire tip 12 in the hole 6 whose position is adapted accordingly.
  • the rest of the modular plug of Fig. 8 is unchanged in its principle with respect to the one of Figs. 1 to 7. In other words, it may also be constituted by a fixed part and a removable part that comprises the lower wall 2' of the plug.
  • each wire preferably has a single conductor rather than braided multi-conductors because of the rigidity needed to form the straightened contact terminals of the plug.
  • plug contacts which are thus directly made by the cable wires, may be metallised, coated and/or plated in any known manner in order to achieve better electrical contact requirements and proper low-resistance contact during the plug's lifetime.
  • the plug of the invention may be adapted to receive a cable having a plurality of pairs of twisted wires or a cable having a plurality of parallel or substantially parallel wires (either in a plane or free in a sheath).

Landscapes

  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
EP01402400A 2000-10-05 2001-09-19 Fiche modulaire et son procédé d'accouplement avec des câbles à pairs torsadées Withdrawn EP1195855A3 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01402400A EP1195855A3 (fr) 2000-10-05 2001-09-19 Fiche modulaire et son procédé d'accouplement avec des câbles à pairs torsadées

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP00402750A EP1195854A1 (fr) 2000-10-05 2000-10-05 Fiche modulaire et procédé pour son couplage avec un câble à paire de fils torsadés
EP00402750 2000-10-05
EP01402400A EP1195855A3 (fr) 2000-10-05 2001-09-19 Fiche modulaire et son procédé d'accouplement avec des câbles à pairs torsadées

Publications (2)

Publication Number Publication Date
EP1195855A2 true EP1195855A2 (fr) 2002-04-10
EP1195855A3 EP1195855A3 (fr) 2002-12-18

Family

ID=26073589

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01402400A Withdrawn EP1195855A3 (fr) 2000-10-05 2001-09-19 Fiche modulaire et son procédé d'accouplement avec des câbles à pairs torsadées

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EP (1) EP1195855A3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2924865A1 (fr) * 2007-12-10 2009-06-12 Integral Process Sarl Dispositif de connexion et systeme medical d'acquisition de signaux electriques equipe d'un tel dispositif de connexion

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3189864A (en) * 1961-05-12 1965-06-15 Angele Wilhelm Electrical connector for flat cables
US4195898A (en) * 1977-12-27 1980-04-01 Bunker Ramo Corporation Patchcord connector
US4267542A (en) * 1978-09-21 1981-05-12 Norbert Weiner Thermal fuse for electrical apparatus
US5176535A (en) * 1990-05-30 1993-01-05 Amp Incorporated Electrical connector and cable utilizing spring grade wire
US6010369A (en) * 1996-02-13 2000-01-04 Citizen Watch Co., Ltd. Small size male multi-contact connector and small size female multi-contact connector

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3189864A (en) * 1961-05-12 1965-06-15 Angele Wilhelm Electrical connector for flat cables
US4195898A (en) * 1977-12-27 1980-04-01 Bunker Ramo Corporation Patchcord connector
US4267542A (en) * 1978-09-21 1981-05-12 Norbert Weiner Thermal fuse for electrical apparatus
US5176535A (en) * 1990-05-30 1993-01-05 Amp Incorporated Electrical connector and cable utilizing spring grade wire
US6010369A (en) * 1996-02-13 2000-01-04 Citizen Watch Co., Ltd. Small size male multi-contact connector and small size female multi-contact connector

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2924865A1 (fr) * 2007-12-10 2009-06-12 Integral Process Sarl Dispositif de connexion et systeme medical d'acquisition de signaux electriques equipe d'un tel dispositif de connexion
WO2009103873A2 (fr) * 2007-12-10 2009-08-27 Integral Process Dispositif de connexion et système médical d'acquisition de signaux électriques équipé d'un tel dispositif de connexion
WO2009103873A3 (fr) * 2007-12-10 2009-10-22 Integral Process Dispositif de connexion et système médical d'acquisition de signaux électriques équipé d'un tel dispositif de connexion
US8313339B2 (en) 2007-12-10 2012-11-20 Integral Process Connection device and medical system for acquiring electric signals provided with such a connection device

Also Published As

Publication number Publication date
EP1195855A3 (fr) 2002-12-18

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