EP1456857A1 - Cable d'interconnexion souple avec des extremites en ruban et procede de fabrication - Google Patents

Cable d'interconnexion souple avec des extremites en ruban et procede de fabrication

Info

Publication number
EP1456857A1
EP1456857A1 EP02763270A EP02763270A EP1456857A1 EP 1456857 A1 EP1456857 A1 EP 1456857A1 EP 02763270 A EP02763270 A EP 02763270A EP 02763270 A EP02763270 A EP 02763270A EP 1456857 A1 EP1456857 A1 EP 1456857A1
Authority
EP
European Patent Office
Prior art keywords
wires
core
sheath
shield
cable
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
EP02763270A
Other languages
German (de)
English (en)
Other versions
EP1456857B1 (fr
Inventor
Arthur Buck
Laurence A. Daane
Malai Hongthong
Cindy Lee Diegel
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.)
Ludlow Co LP
Original Assignee
Ludlow Co LP
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 US10/025,096 external-priority patent/US6580034B2/en
Priority claimed from US10/186,525 external-priority patent/US6651318B2/en
Application filed by Ludlow Co LP filed Critical Ludlow Co LP
Publication of EP1456857A1 publication Critical patent/EP1456857A1/fr
Application granted granted Critical
Publication of EP1456857B1 publication Critical patent/EP1456857B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/08—Flat or ribbon cables
    • H01B7/0892—Flat or ribbon cables incorporated in a cable of non-flat configuration
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/08—Flat or ribbon cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables

Definitions

  • This invention relates to multiple wire cables, and more particularly to small gauge coaxial wiring.
  • Certain demanding applications require miniaturized multi-wire cable assemblies. To avoid undesirably bulky cables when substantial numbers of conductors are required, very fine conductors are used. To limit electrical noise and interference, coaxial wires having shielding are used for the conductors. A dielectric sheath surrounds a central conductor, and electrically separates it from the conductive shielding. A bundle of such wires is surrounded by a conductive braided shield, and an outer protective sheath.
  • a cable be very flexible, supple, or "floppy."
  • a stiff cable with even moderate resistance to flexing can make ultrasound imaging difficult.
  • the bundle of wires may be undesirably rigid.
  • cable assemblies having a multitude of conductors may be time- consuming and expensive to assemble with other components.
  • wires When individual wires are used in a bundle, one can not readily identify which wire end corresponds to a selected wire at the other end of the bundle, requiring tedious continuity testing.
  • the wire ends at one end of the cable are connected to a component such as a connector or printed circuit board, and the connector or board is connected to a test facility that energizes each wire, one-at-a-time, so that an assembler can connect the identified wire end to the appropriate connection on a second connector or board.
  • a ribbon cable in which the wires are in a sequence that is preserved from one end of the cable to the other may address this particular problem.
  • the wires of the ribbon welded together, they resist bending, creating an undesirably stiff cable.
  • a ribbon folded along multiple longitudinal fold lines may tend not to generate a compact cross section, undesirably increasing bulk, and may not provide a circular cross section desired in many applications.
  • the present invention overcomes the limitations of the prior art by providing a cable assembly and method of manufacturing.
  • the method includes providing a core, and wrapping a conductive shield element about the core.
  • An insulating sheath layer is extruded about the core to encompass the shield element, and a multi-wire cable component having ribbonized ends and detached intermediate portions is connected to an end of the core.
  • the core is removed from the sheath to insert the cable component into the sheath.
  • the resulting assembly has intermediate portions of the cable component that are loosely received within the shield and sheath.
  • Figure 1 is a perspective view of a cable assembly according to a preferred embodiment of the invention.
  • Figure 2 is a perspective view of wiring components according to the embodiment of Figure 1.
  • Figure 3 is an enlarged sectional view of an end portion of a wiring component according to the embodiment of Figure 1.
  • Figure 4 is an enlarged sectional view of the cable assembly according to the embodiment of Figure 1.
  • Figure 5 is an enlarged sectional view of the cable assembly in a flexed condition according to the embodiment of Figure 1.
  • Figure 6 is a simplified side view of a first process in a preferred method of manufacturing a cable assembly.
  • Figures 7A and 7B are a cross sectional views of a cable sheath component of the preferred embodiment of the invention.
  • Figure 8 is a side view of a cable assembly in a selected stage of manufacturing according to the method of claim 6.
  • Figure 9 is a side view of a cable assembly in a selected stage of manufacturing according to the method of claim 6.
  • Figure 10 is a side view of a cable assembly in a selected stage of manufacturing according to the method of claim 6.
  • Figure 11 is a side view of a cable assembly after manufacturing according to the method of claim 6. Detailed Description of a Preferred Embodiment
  • Figure 1 shows a cable assembly 10 having a connector end 12, a transducer end 14, and a connecting flexible cable 16.
  • the connector end and transducer ends are shown as examples of components that can be connected to the cable 16.
  • the connector end includes a circuit board 20 with a connector 22 for connection to an electronic instrument such as an ultrasound imaging machine.
  • the connector end includes a connector housing 24, and strain relief 26 that surrounds the end of the cable.
  • an ultrasound transducer 30 is connected to the cable.
  • the cable 16 includes a multitude of fine coaxially shielded wires 32. As also shown in Figure 2, the wires are arranged into groups 33, with each group having a ribbonized ribbon portion 34 at each end, and an elongated loose portion 36 between the ribbon portions and extending almost the entire length of the cable. Each ribbon portion includes a single layer of wires arranged side-by-side, adhered to each other, and trimmed to expose a shielding layer and center conductor for each wire. In the loose portion, the wires are unconnected to each other except at their ends. The shielding and conductor of each wire are connected to the circuit board, or to any electronic component or connector by any conventional means, as dictated by the needs of the application for which the cable is used.
  • the loose portions 36 of the wires extend the entire length of the cable between the strain reliefs, through the strain reliefs, and into the housing where the ribbon portions are laid out and connected.
  • the ribbon portions 34 are each marked with unique indicia to enable assemblers to correlate the opposite ribbon portions of a given group, and to correlate the ends of particular wires in each group.
  • a group identifier 40 is imprinted on the ribbon portion, and a first wire identifier 42 on each ribbon portion assures that the first wire in the sequence of each ribbon is identified on each end. It is important that each group have a one-to-one correspondence in the sequence of wires in each ribbon portion.
  • FIG. 3 shows a cross section of a representative end portion, with the wires connected together at their outer sheathing layers 44 at weld joints 46, while the conductive shielding 50 of each of the wires remains electrically isolated from the others, and the inner dielectric 52 and central conductors 54 remain intact and isolated.
  • the ribbon portions may be secured by the use of adhesive between abutting sheathing layers 44, by adhesion of each sheathing layer to a common strip or sheet, or by a mechanical clip.
  • Figure 4 shows the cable cross section throughout most of the length of the cable, away from the ribbon portions, reflecting the intermediate portion.
  • the wires are loosely contained within a flexible cylindrical cable sheath 60.
  • a conductive braided shield 62 surrounds all the wires, and resides at the interior surface of the sheath to define a bore 64.
  • the bore diameter is selected to be somewhat larger than required to closely accommodate all the wires. This provides the ability for the cable to flex with minimal resistance to a tight bend, as shown in Figure 5, as the wires are free to slide to a flattened configuration in which the bore cross section is reduced from the circular cross section it has when held straight, as in Figure 4.
  • the wires preferably have an exterior diameter of .016 inch, although this and other dimensions may range to any size, depending on the application.
  • the cable has an overall exterior diameter of the jacket portion 60 of .330 inch and the sheath has a bore diameter of .270 inch. As the loose wires tend to pack to a cross-sectional area only slightly greater than the sum of their areas, there is significant extra space in the bore in normal conditions.
  • a bend radius of .75 inch or about 2 times the cable diameter, is provided with minimal bending force, such as if the cable is folded between two fingers and allowed to bend to a natural radius.
  • the bend radius, and the supple lack of resistance to bending is limited by little more than the total bending resistance of each of the components. Because each wire is so thin, and has minimal resistance to bending at the radiuses on the scale of the cable diameter, the sum of the wire's resistances adds little to the bending resistance of the sheath and shield, which thus establish the total bending resistance.
  • FIG. 6 shows a sheath manufacturing facility 70 including a shield braiding or weaving machine 72 and an extruder 74.
  • a nylon core tube 76 with a smooth exterior surface with a diameter of 0.250 inch has a bore diameter of 0.200 inch.
  • the core tube may be of any of a wide range of alternative materials, and may have a solid core.
  • the tube is fed into the braiding machine, which wraps fine conductive metal strands 80 about the tube to form the shield 62.
  • the shielded core is fed into the extruder 74, which extrudes the sheath 60 about the shielded core tube to form a resulting sheath component 82, which is shown in cross section in Figures 7A and 7B.
  • the sheath material is flexible PNC, with alternative materials including thermoplastic elastomer, or polyurethane.
  • the shield is extruded at a limited low temperature so that the sheath material maintains viscosity, does not excessively penetrate the pores or gaps between shield wires, and does not appreciably contact the core, except as minimally shown in Figure 7B. This avoids adhesion that would make core tube extraction difficult.
  • the sheath material partly encapsulates some of the shield wires, by at least partly encompassing them, and in selected embodiments, penetrating through interstices between the wires to contact or approach the surface of the core.
  • the sheath material at least partly encapsulates the shield wires, generating adhesion that helps to maintain the shield and sheath interior in contact with each other throughout the length, without detaching during manufacture, assembly, or use of the cable. Consequently, the shield wires do not fall away from the sheath, but remain adhered along the entire length. This provides elastic resistance to tension, and facilitates restoration of its original length when tension is removed.
  • the shield wires provide an elongation limit as they folly compress about the wires within to resist increasing tension, after which the elasticity of the sheath returns the shield to its original length and diameter about the wires within to provide the desired flexibility as discussed above. In some applications, these functions and benefits may be achieved if the shield detaches from the sheath, as long as the sheath is loose with respect to the cable wires, and remains attached to the sheath at each end.
  • Figure 8 shows the sheath segment 82 (which includes the core, shield, and sheath) cut to provide an end 86.
  • An opposed end (not shown) is similarly cut.
  • the sheath layer is cut on lines 90 for removal of an end portion 92 comprising about 6 inches of the segment on each end, while leaving the shield wires and core intact.
  • the end portion is removed, and the shield wires 62 are folded back into a cylindrical shape against the exterior of the sheath 60, and secured at the end by a band of adhesive tape 94.
  • the ends of the shield may optionally be secured to the sheath by attachment of a strain relief element 96.
  • the strain relief element may be an over-molded elastomer that covers the folded back portion of the shield wires, or may be a rigid clamping type device that pinches the shield and sheath end in an annular gap or nip. Even without the strain relief element, the folded-back shield end resists dislodgment from the sheath by axial tension forces from the opposite end.
  • the cable ribbons 33 are connected at their ends to an end of the core 76 by a woven sheath 100 that collapses about its contents as tension is applied.
  • Alternative embodiment such as clips, tape, or other hooks may be employed, as long as they are slim enough to readily pass through the bore of the sheath, and to protect the ribbonized ends of the wires as the pass through the sheath, all without damaging the shielding in the sheath.
  • the core 76 is pulled from the end opposite the connected ribbons 33, until an approximately equal length of cable is exposed at each end of the sheath, and the core is detached from the ribbons, as shown in Figure 11, which shows the resulting cable component.
  • the cable component has ribbonized ends exposed at each end, and indicia identifying each group at each end, and the first wire in each group for subsequent operations.
  • the wires are laser stripped to expose the central conductors and shielding in each wire, enabling connection to connectors of circuit elements as discussed above.
  • the strain reliefs may be added after ribbon insertion, and the folded back shield wires may be trimmed.
  • the shield wires may be effectively adhered to the sheath interior during the sheath extrusion, so that folding back and end taping is not needed to prevent the shield from slipping out or necking down during ribbon insertion.
  • the shield may be loose or readily separable from the sheath interior, necessitating the illustrated folding back of the shield ends.

Landscapes

  • Insulated Conductors (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Electric Cables (AREA)

Abstract

La présente invention concerne un câble d'interconnexion souple fabriqué par un procédé qui consiste à prendre une âme et à envelopper un élément de blindage conducteur autour de cette âme. Une couche de gainage isolante est extrudée autour de l'âme de façon à entourer l'élément de blindage et un élément de câble à fils multiples possédant des extrémités en ruban ainsi que des partie intermédiaires détachées est connecté à une extrémité de l'âme. Cette âme est retirée du gainage de façon à introduire l'élément de câble dans ce gainage. L'ensemble qui en résulte possède des parties intermédiaires de cet élément de câble qui sont reçues de manière lâche à l'intérieur du blindage et du gainage.
EP02763270.2A 2001-12-18 2002-07-11 Cable d'interconnexion souple avec des extremites en ruban et procede de fabrication Expired - Lifetime EP1456857B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US186525 1998-11-05
US10/025,096 US6580034B2 (en) 2001-03-30 2001-12-18 Flexible interconnect cable with ribbonized ends
US25096 2001-12-18
US10/186,525 US6651318B2 (en) 2001-03-30 2002-06-28 Method of manufacturing flexible interconnect cable
PCT/US2002/022172 WO2003052772A1 (fr) 2001-12-18 2002-07-11 Cable d'interconnexion souple avec des extremites en ruban et procede de fabrication

Publications (2)

Publication Number Publication Date
EP1456857A1 true EP1456857A1 (fr) 2004-09-15
EP1456857B1 EP1456857B1 (fr) 2019-02-13

Family

ID=26699267

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02763270.2A Expired - Lifetime EP1456857B1 (fr) 2001-12-18 2002-07-11 Cable d'interconnexion souple avec des extremites en ruban et procede de fabrication

Country Status (7)

Country Link
EP (1) EP1456857B1 (fr)
JP (1) JP4624674B2 (fr)
KR (1) KR100974412B1 (fr)
CN (1) CN1293574C (fr)
AU (1) AU2002327238A1 (fr)
IL (1) IL162551A0 (fr)
WO (1) WO2003052772A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7271340B2 (en) * 2005-01-06 2007-09-18 Precision Interconnect, Inc. Flexible interconnect cable with insulated shield and method of manufacturing
CN102227856B (zh) * 2009-11-27 2014-11-26 住友电气工业株式会社 细径同轴电缆束及其制造方法
JP5463953B2 (ja) * 2010-02-26 2014-04-09 住友電気工業株式会社 細径同軸ケーブルハーネス及びその製造方法
EP2784785A1 (fr) * 2013-03-26 2014-10-01 Tyco Electronics Nederland B.V. Ensemble de câble
JP6755147B2 (ja) * 2016-08-29 2020-09-16 オリンパス株式会社 ケーブル、超音波プローブ、及び超音波内視鏡
CN110391563A (zh) * 2018-04-21 2019-10-29 富士康(昆山)电脑接插件有限公司 电互连系统
CN118173312A (zh) * 2024-04-25 2024-06-11 江苏赛德电气有限公司 一种高柔性控制电缆及其生产设备

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JPS6062008A (ja) 1983-08-31 1985-04-10 ミネソタ　マイニング　アンド　マニユフアクチユアリング　コンパニー 円形被覆ケーブル
JPS61142607A (ja) * 1984-12-14 1986-06-30 三菱電線工業株式会社 バスケ−ブル及びその製造方法
DE3721085A1 (de) * 1987-06-26 1989-01-05 Kabelmetal Electro Gmbh Verfahren zur herstellung eines elektrischen kabels
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Also Published As

Publication number Publication date
JP2005513716A (ja) 2005-05-12
KR100974412B1 (ko) 2010-08-05
CN1605108A (zh) 2005-04-06
AU2002327238A1 (en) 2003-06-30
WO2003052772A1 (fr) 2003-06-26
IL162551A0 (en) 2005-11-20
JP4624674B2 (ja) 2011-02-02
CN1293574C (zh) 2007-01-03
KR20040062997A (ko) 2004-07-09
EP1456857B1 (fr) 2019-02-13

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