EP0987720B1 - Coaxial cable, multicore cable, and electronics using them - Google Patents
Coaxial cable, multicore cable, and electronics using them Download PDFInfo
- Publication number
- EP0987720B1 EP0987720B1 EP99910817A EP99910817A EP0987720B1 EP 0987720 B1 EP0987720 B1 EP 0987720B1 EP 99910817 A EP99910817 A EP 99910817A EP 99910817 A EP99910817 A EP 99910817A EP 0987720 B1 EP0987720 B1 EP 0987720B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ribbon
- coaxial
- insulation layer
- element wire
- conductor
- 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.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
- H01B11/1808—Construction of the conductors
- H01B11/183—Co-axial cables with at least one helicoidally wound tape-conductor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
Definitions
- the present invention relates to single-core coaxial element wires or coaxial cables, or multicore coaxial cables which are used for the connection of a liquid crystal display within a notebook computer, or for sensor cables within a medical-purpose ultrasonic wave diagnostic apparatus, and the like, and further, relates to electronic apparatuses using the same.
- Coaxial cables comprising a coaxial element wire, made up of a center conductor, an insulation layer, and an outer conductor, and a jacket disposed over the coaxial element wire have been in use thus far. Included among the types of coaxial cables are a single-core cable formed by providing a single coaxial element wire with a jacket, a multicore cable formed by providing a plurality of single-core cables with a common jacket, and a multicore cable formed by providing a plurality of coaxial element wires with a common jacket.
- a flat-type multicore cable obtained by arranging coaxial element wires or coaxial cables on a plane and a twisted-layer multicore cable obtained by twisting them together.
- a twisted-layer multicore cable obtained by twisting them together.
- a metallic tape or a laminate tape obtained by laminating a metallic tape and an insulating film of polyester or the like is generally used as the outer conductor (shield).
- a braided structure of metallic tapes as disclosed in Japanese Laid-open Utility Model No. Hei 2-47726 (JP-2 047 726 U) and No. Hei 2-47728 (JP-2 047 728 U) is known.
- the advantage of the outer conductor when it is formed of braided metal tapes is that it does not become loose.
- its disadvantage is that removal of the outer conductor is troublesome when, for example, making a terminal treatment.
- FIG. 4 is a side view showing a conventional coaxial cable employing braided metallic tapes.
- reference numeral 11 denotes a center conductor
- 12 denotes an insulation layer
- 13 denotes an outer conductor formed by braiding metallic tapes
- 14 denotes a jacket.
- Metallic tapes obtained by slitting a wide metallic tape are normally used.
- JP-4019923 discloses a coaxial cable with an outer conductor formed by a metal tape wound helically around an insulated center conductor.
- the present invention was made as a result of the various investigations which the inventors had conducted on the above described problems and it can be applied to coaxial cables of various types as described above.
- a coaxial element wire and a coaxial cable being flexible, producing minimal noise when making a mechanical movement, having good mechanical durability, and being small in outer diameter can be obtained by helically wrapping, around the insulation layer, a ribbon-shaped conductor obtained by rolling and flattening a copper or copper alloy wire and thereby constructing an outer conductor.
- the invention can be defined as a method of forming a coaxial element wire comprising a center conductor, an insulating layer, and an outer conductor wherein one or a plurality of ribbon-shaped conductors is spirally wrapped around the insulation layer to form the outer conductor, characterized by forming said insulation layer with a thickness where the thickness is smallest of not greater than 0.15 mm, and pressing a copper or copper alloy round wire into a form of virtually rectangular cross-section with its four corners smoothed to obtain said one or plurality of ribbon-shaped conductors used for wrapping.
- the invention can additionally be defined as a coaxial element wire comprising a center conductor, an insulation layer, and an outer conductor formed as one or a plurality of ribbon-shaped conductors helically wrapped around said insulation layer, the coaxial element wire being characterized in that the thickness of said insulation layer where the thickness is smallest is not greater than 0.15 mm and the or each said ribbon-shaped conductor has a virtually rectangular cross-section with its four corners smoothed.
- the wrapping angle of the ribbon-shaped conductor with respect to the axis of the coaxial element wire may be 45 degrees or more.
- the thickness of the insulation layer is given by the thickness at the portion where the smallest value is obtained in the measurement of the insulation layer thickness in the circumferential direction.
- the ribbon-shaped conductor is made of a metal including copper and the ribbon-shaped conductor is wrapped around the insulation layer under a tension of 30% or more of the tensile strength of the ribbon-shaped conductor.
- coaxial element wire may be provided with a jacket so as to be formed into a single-core coaxial cable.
- a plurality of the above described coaxial element wires may be combined and provided with a common jacket so as to be formed into a multicore cable.
- the aforesaid single-core coaxial cables may be provided with a common jacket to be formed into a multicore cable.
- An electronic apparatus may be characterized in that the above described coaxial element wire, coaxial cable, or multicore cable is disposed therein at a place where the wire or cable is subjected to mechanical rotation or bending of the electronic apparatus.
- the ribbon-shaped conductor used here of a virtually rectangular cross section having its four corners smoothed, can be manufactured with ease and at low cost by rolling and flattening a round wire of copper or a copper alloy.
- the ribbon-shaped conductor has no edge that forms an acute angle at the circumference of the cross-section, and therefore, when the same is helically mounted as the outer conductor, harm to the insulation layer or voltage concentration does not occur.
- such a ribbon-shaped conductor of a virtually rectangular cross section has high mechanical strength and, because it is not braided, it can be removed with no trouble when, for example, making a terminal treatment.
- the noise occurring in a coaxial cable due to rotation or bending at the portion where it is disposed in an electronic apparatus is an electrostatic noise caused by friction between the insulation layer and the outer conductor.
- the outer conductor of the present invention is helically mounted with one long side of the virtually rectangular form of the ribbon-shaped conductor facing the insulation layer, the area of the contact face between the ribbon-shaped conductor and the insulation layer is sufficiently large to increase friction therebetween and, hence impedes the phenomenon of sliding movement of the ribbon-shaped conductor and the insulation layer along each other, thereby suppressing the occurrence of electrostatic noise.
- the coaxial element wire constituting the coaxial cable embodying the present invention basically has an insulation layer with a thickness of 0.15 mm or less, and hence, the coaxial element wire can be made smaller in diameter. Accordingly, positive effects are exhibited especially when it is applied to a coaxial cable or a thin flat type multicore cable for use in wiring in an electronic apparatus which has a small space for wiring and hence requires decrease in the volume of wires and cables occupying the space.
- the coaxial element wire is constructed by using as the outer conductor a ribbon-shaped conductor obtained by pressing and flattening a copper or copper alloy round wire and helically wrapping the ribbon-shaped conductor around the insulation layer.
- Figure 1 is a perspective view schematically showing a single-core coaxial cable employing a typical coaxial element wire embodying the present invention.
- reference numeral 1 denotes a center conductor of copper, copper alloy, or the like
- 2 denotes an insulation layer made of PFA, polyester, polyimide film, or the like
- 3 denotes an outer conductor formed of a ribbon-shaped conductor whose cross-section is virtually a rectangle having its four corners smoothed.
- the ribbon-shaped conductor can be produced by such a method as chamfering four corners of a rectangular conductor. It can also be manufactured by pressing and flattening a copper or copper alloy round wire, which is advantageous in terms of production cost.
- the ribbon-shaped conductor is helically wrapped around the insulation layer 2 to provide the outer conductor 3.
- a tin-plated round wire of a copper alloy of 0.05 mm in outer diameter having a cross section as shown in FIG. 5(A) was pressed and thereby a long ribbon-shaped conductor 0.012 mm thick and 0.18 mm wide having a cross section as shown in FIG. 5(B) was manufactured.
- PFA tetrafluoroethelene-perfluoroalkylvinylether copolymer resin was extruded to cover the periphery of a center conductor of 0.09 mm in outer diameter (seven tin-plated copper-alloy wires of 30 ⁇ m in outer diameter being stranded ) by a known extruding and covering method so that a circular profile of 0.23 mm in outer diameter is formed. Then, the above described tape-shaped conductor was helically wrapped around the same, so as to form an angle of 68 degrees with respect to the axis of the coaxial element wire, by open wrapping as shown in FIG. 2(A), spaced apart at a pitch of 0.29 mm, under a tension of 0.59N (60 gf) per piece, and thereby a coaxial element wire was manufactured.
- Mandrel bending test The testing method is schematically shown in FIG. 6. Having a coaxial element wire 20 held, at its center portion, between two metallic bars 22 of 5 mm in outer diameter and having a load 21 of 0.49N (50 gf) attached to its lower end, the upper end portion was bent so as to be wrapped around the metallic bar on one side at 90 degrees, then straightened, and then wrapped around the metallic bar on the other side at 90 degrees. Counting a set of bending to one side and the other side as one cycle, 1000 cycles of the bending operation was carried out at a rate of 30 cycles/minute. Thereafter, the withstand voltage test as described above was carried out on the article, in which no inferiority in withstand voltage was observed. Thus, it has been confirmed that the coaxial element wire has excellent characteristics against repeated bending.
- Torsion test The testing method is schematically shown in FIG. 7.
- a coaxial element wire 20 of a length of 20 cm was vertically hanged down having the upper end thereof fixed to an upper end fixing point 24 and having a load 23 of 0.49N (50 gf) attached to the lower end thereof.
- the load 23 was caused to alternately turn 180 degrees around the center axis of the coaxial cable clockwise and counterclockwise.
- Counting a set of twisting clockwise and counterclockwise as one cycle 1000 cycles of the twisting operation were carried out at the rate of 30 cycles/minute.
- the withstand voltage test as described above was carried out on the coaxial element wire, in which no inferiority in withstand voltage was observed.
- the coaxial element wire has excellent characteristics against repeated twisting.
- Electrostatic noise characteristic In order to further evaluate the value of the electrostatic noise produced at the time when an abrupt deformation is caused to a coaxial element wire, a coaxial element wire of a length of 50 cm was horizontally stretched, a cotton wire of a length of 20 cm was attached to the center thereof, and a load of 0.20N (20 gf) was attached to the other end of the cotton wire. While the voltage between the center conductor and the outer conductor of the coaxial element wire was measured with a voltmeter, the weight was allowed to fall by its own weight from the altitude of the coaxial element wire, and the electrostatic noise characteristic was measured as the maximum value of the voltage variation.
- the maximum value of the voltage variation was as high as 100 mV. From this result, it has been confirmed that substatial improvement in attenuating the electrostatic noise can be obtained by utilizing the present invention.
- Example 1 a coaxial element wire was produced by helical wrapping of a ribbon-shaped conductor under a tension of 0.54N (55 gf) per piece, at a pitch of 0.18 mm, at an angle of 75 degrees, and in a butt-joined manner as shown in FIG. 2(B).
- This coaxial element wire was excellent in all of the withstand voltage characteristics, bending characteristics, torsion characteristics, and electrostatic noise characteristics.
- a single-core coaxial cable, a flat type multicore cable, and a multicore cable were produced in the same manner as in Example 1.
- Example 1 a coaxial element wire was produced by helical wrapping of ribbon-shaped conductors under a tension of 0.64N (65 gf) per piece, at a pitch of 0.29 mm, and at an angle of 68 degrees (double sheets were wrapped, each in open wrapping, in the same direction) as shown in FIG. 2(C).
- the coaxial element wire shown in FIG. 2(D) was also produced by wrapping ribbon-shaped conductors at a pitch of 0.29 mm and at an angle of 68 degrees, with the second one wrapped in the opposite direction.
- These coaxial element wires had excellent withstand voltage characteristics, bending characteristics, torsion characteristics, and electrostatic noise characteristics and especially excellent shielding characteristics of the outer conductor layer. Also by the use of these coaxial element wires, a single-core coaxial cable, a flat type multicore cable, and a multicore cable were produced in the same manner as in Example 1.
- a coaxial element wire is produced by using a ribbon-shaped conductor of a virtually rectangular cross-section with four corners thereof smoothed as the outer conductor and wrapping the ribbon-shaped conductor around the insulation layer to provide the outer conductor, a small-diameter coaxial cable being flexible and excellent in mechanical durability can be provided by the use of the coaxial element wire.
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- Communication Cables (AREA)
Description
Claims (13)
- A coaxial element wire comprising a center conductor (1), an insulation layer (2), and an outer conductor (3) formed as one or a plurality of ribbon-shaped conductors (3) helically wrapped around said insulation layer (2), the coaxial element wire being characterized in that the thickness of said insulation layer where the thickness is smallest is not greater than 0.15 mm and the or each said ribbon-shaped conductor (3) has a virtually rectangular cross-section with its four corners smoothed.
- A coaxial element wire according to Claim 1, wherein the wrapping angle of said ribbon-shaped conductor (3) with respect to the axis of said coaxial element wire is 45 degrees or more.
- A coaxial element wire according to Claim 1 or Claim 2, wherein said ribbon-shaped conductor (3) is made of a metal including copper and is wrapped around said insulation layer (2) under a tension of 30% or more of the tensile strength of said ribbon-shaped conductor.
- A coaxial element wire according to any of Claims 1 to 3, wherein said ribbon-shaped conductor (3) is formed from a copper or copper alloy round wire pressed into a flat form having a virtually rectangular cross-section with its forms corners smoothed.
- A coaxial element wire according to any of Claims 1 to 4, wherein said thickness of said insulation layer is 0.03 mm or more.
- A coaxial cable comprising one piece of said coaxial element wire set forth in any of Claims 1 to 5 provided with a jacket (4).
- A multicore cable comprising an assembly of a plurality of said coaxial cables set forth in Claim 6 provided with a common jacket.
- A multicore cable comprising an assembly of a plurality of said coaxial element wires set forth in any of Claims 1 to 5 provided with a common jacket.
- An electronic apparatus characterized in that it has at least one of said coaxial cables set forth in Claim 6 or said multicore cables set forth in Claim 7 or Claim 8 disposed at a portion where said at least one coaxial cable or multicore cable is subjected to mechanical rotation or bending of said electronic apparatus.
- A method of forming a coaxial element wire comprising a center conductor (1), an insulating layer (2), and an outer conductor (3) wherein one or a plurality of ribbon-shaped conductors (3) is spirally wrapped around the insulation layer (2) to form the outer conductor, characterized by forming said insulation layer with a thickness where the thickness is smallest not greater than 0.15 mm, and pressing a copper or copper alloy round wire into a form of virtually rectangular cross-section with its four corners smoothed to obtain said one or plurality of ribbon-shaped conductors used for wrapping.
- A method according to Claim 10, wherein the ribbon-shaped conductor (3) is wrapped around the insulation layer (2) at a wrapping angle of 45 degrees or more.
- A method according to Claim 10 or Claim 11, wherein said ribbon-shaped conductor (3) is wrapped under a tension of 30% or more of the tensile strength of said ribbon-shaped conductor.
- A method according to any of Claims 10 to 12, wherein said thickness of said insulation layer is 0.03 mm or more.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10108450A JPH11297132A (en) | 1998-04-06 | 1998-04-06 | Coaxial cable and multicore cable using it |
JP10845098 | 1998-04-06 | ||
PCT/JP1999/001744 WO1999052116A1 (en) | 1998-04-06 | 1999-04-01 | Coaxial cable, multicore cable, and electronics using them |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0987720A1 EP0987720A1 (en) | 2000-03-22 |
EP0987720A4 EP0987720A4 (en) | 2002-03-20 |
EP0987720B1 true EP0987720B1 (en) | 2005-02-16 |
Family
ID=14485097
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99910817A Expired - Lifetime EP0987720B1 (en) | 1998-04-06 | 1999-04-01 | Coaxial cable, multicore cable, and electronics using them |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0987720B1 (en) |
JP (1) | JPH11297132A (en) |
KR (1) | KR100613954B1 (en) |
DE (1) | DE69923740T2 (en) |
TW (1) | TW424241B (en) |
WO (1) | WO1999052116A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR200445224Y1 (en) * | 2008-11-26 | 2009-07-08 | 권정태 | The cable for transmission of voice signal |
JP2012227055A (en) * | 2011-04-21 | 2012-11-15 | Hitachi Cable Fine Tech Ltd | Flat cable and cable harness using the same |
CH707152A8 (en) * | 2012-10-26 | 2014-07-15 | Huber+Suhner Ag | Microwave cable and method for making and using such a microwave cable. |
CN103680694A (en) * | 2013-11-08 | 2014-03-26 | 东莞讯滔电子有限公司 | Round cable |
DE102014013555B4 (en) * | 2014-09-18 | 2016-09-22 | Hartmut Bayer | Cable for signal transmission, method for its manufacture and use of such a cable for the transmission of audio signals |
CN105355341B (en) * | 2015-12-04 | 2017-01-11 | 北京玻钢院复合材料有限公司 | Solid core rod, insulator and manufacturing method |
JP6380873B1 (en) * | 2017-11-28 | 2018-08-29 | 日立金属株式会社 | Braided shielded cable |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4365109A (en) * | 1980-01-25 | 1982-12-21 | The United States Of America As Represented By The Secretary Of The Air Force | Coaxial cable design |
DE8804552U1 (en) * | 1988-04-06 | 1988-06-09 | Sun Audio Unterhaltungselektronik Vertriebs GmbH, 8000 München | Electrical conductor cable for the transmission of audio frequency signals in the audio range |
JP2658498B2 (en) * | 1990-05-11 | 1997-09-30 | 日立電線株式会社 | Coaxial cable manufacturing method |
JP2567300Y2 (en) * | 1992-04-17 | 1998-04-02 | 東京特殊電線株式会社 | Small diameter curled cable |
JPH07169334A (en) * | 1993-10-08 | 1995-07-04 | Furukawa Electric Co Ltd:The | Foamed fluororesin insulated cable and manufacture thereof |
JPH08195130A (en) * | 1995-01-17 | 1996-07-30 | Hitachi Cable Ltd | Cable for vehicle |
EP0759624A1 (en) * | 1995-08-19 | 1997-02-26 | Alcatel Kabel AG & Co. | Electrical telecommunications cable |
-
1998
- 1998-04-06 JP JP10108450A patent/JPH11297132A/en active Pending
-
1999
- 1999-04-01 EP EP99910817A patent/EP0987720B1/en not_active Expired - Lifetime
- 1999-04-01 DE DE69923740T patent/DE69923740T2/en not_active Expired - Lifetime
- 1999-04-01 KR KR1019997011217A patent/KR100613954B1/en not_active IP Right Cessation
- 1999-04-01 WO PCT/JP1999/001744 patent/WO1999052116A1/en not_active Application Discontinuation
- 1999-04-02 TW TW088105294A patent/TW424241B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP0987720A1 (en) | 2000-03-22 |
DE69923740D1 (en) | 2005-03-24 |
EP0987720A4 (en) | 2002-03-20 |
JPH11297132A (en) | 1999-10-29 |
DE69923740T2 (en) | 2006-01-19 |
WO1999052116A1 (en) | 1999-10-14 |
TW424241B (en) | 2001-03-01 |
KR20010013227A (en) | 2001-02-26 |
KR100613954B1 (en) | 2006-08-18 |
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