WO2012074002A1 - 絶縁電線、同軸ケーブル及び多心ケーブル - Google Patents
絶縁電線、同軸ケーブル及び多心ケーブル Download PDFInfo
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- WO2012074002A1 WO2012074002A1 PCT/JP2011/077665 JP2011077665W WO2012074002A1 WO 2012074002 A1 WO2012074002 A1 WO 2012074002A1 JP 2011077665 W JP2011077665 W JP 2011077665W WO 2012074002 A1 WO2012074002 A1 WO 2012074002A1
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- 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
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- 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
- H01B11/1834—Construction of the insulation between the conductors
- H01B11/1856—Discontinuous insulation
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- 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
-
- 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
-
- 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
- H01B11/20—Cables having a multiplicity of coaxial lines
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- 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
- H01B7/02—Disposition of insulation
- H01B7/0233—Cables with a predominant gas dielectric
Definitions
- the present invention relates to an insulated wire, a coaxial cable, and a multi-core cable used for telecommunication equipment, information equipment, industrial machinery, vehicle wiring, and the like.
- Insulated wires and coaxial cables are used for wiring inside equipment, between equipment, inside machines, and inside vehicles.
- Insulated wires are those in which the center conductor is covered with an insulator, and coaxial cables are usually covered with an insulator in the center conductor, the outer periphery of the insulator is covered with an external conductor, and the outside is covered with a protective covering.
- the central conductor is covered with an insulator having 6 to 9 cross-sectional circular or elliptical gaps continuous in the longitudinal direction, and an outer conductor is arranged on the outer periphery of the insulator to provide a low dielectric constant coaxial cable.
- an insulator having 6 to 9 cross-sectional circular or elliptical gaps continuous in the longitudinal direction
- an outer conductor is arranged on the outer periphery of the insulator to provide a low dielectric constant coaxial cable.
- a coaxial cable having a fan-shaped cross section of the gap is also known (see, for example, Patent Document 2).
- the dielectric constant of the insulator can be reduced and good electrical characteristics can be obtained.
- the void ratio of the void portion is too large, the withstand voltage between the center conductor and the outer conductor is lowered.
- the porosity is large, the strength may be reduced.
- the cross section of the air gap is fan-shaped, the air gap will be easily deformed against bending, and the cable will be crushed by external pressure to ensure stable transmission characteristics. May become difficult.
- An object of the present invention is to provide an insulated wire, a coaxial cable, and a multi-core cable capable of reducing the dielectric constant of an insulator and obtaining good electrical characteristics with a small diameter without causing a decrease in withstand voltage and a decrease in strength. It is to provide.
- the insulated wire of the present invention that can solve the above-mentioned problem is an insulated wire in which the central conductor is covered with an insulator having a continuous void in the longitudinal direction, The gap is formed in a circular or elliptical cross section, and 6 to 8 gaps are evenly arranged on the insulator, and the area of all the gaps and the insulator in the cross section perpendicular to the cable length direction
- the void ratio of all the void portions is 18% or more and 35% or less.
- the coaxial cable of the present invention is a coaxial cable in which a center conductor is covered with an insulator having a continuous gap in the longitudinal direction, and an outer conductor is arranged on the outer periphery of the insulator,
- the gap is formed in a circular or elliptical cross section, and 6 to 8 gaps are evenly arranged on the insulator, and the area of all the gaps and the insulator in the cross section perpendicular to the cable length direction
- the void ratio of all the void portions is 18% or more and 35% or less.
- the insulator is preferably formed from a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer.
- the multi-core cable of the present invention is characterized in that a plurality of the above insulated wires or coaxial cables are accommodated.
- the dielectric constant of the insulator can be reduced, and good electrical characteristics can be obtained with a small diameter. it can. Further, by setting the porosity to 18% or more and 35% or less, it is possible to reliably ensure the withstand voltage between the center conductor and the outer conductor without causing a decrease in strength.
- the coaxial cable 11 includes a central conductor 12 covered with an insulator 13, an outer conductor 15 arranged on the outer periphery of the insulator 13, and an outer cover 16 covered with the outer conductor 15 for protection. This is the configuration.
- the central conductor 12 and the insulator 13 of the coaxial cable 11 have the same configuration in the insulated wire of the present invention.
- the insulator 13 has eight gap portions 14 that are continuous in the longitudinal direction. These voids 14 are formed in a circular cross section with an outer diameter D3, and are uniformly arranged in the circumferential direction on the insulator 13. Further, the center conductor 12 and the insulator 13 and the outer conductor 15 and the insulator 13 are in close contact.
- the central conductor 12 is formed of a single wire or a stranded wire made of silver-plated or tin-plated annealed copper wire or copper alloy wire.
- a stranded wire for example, an outer diameter D2 obtained by twisting seven wires having a wire conductor diameter of 0.030 mm is 0.090 mm (equivalent to AWG (American Wire Gauge) # 40), or a wire conductor diameter. 7 having an outer diameter D2 of 0.075 mm (equivalent to AWG # 42) is used.
- a fluororesin made of PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer) is used for the insulator 13, and the insulator 13 is formed by extruding this fluororesin.
- PFA has a low dielectric constant among insulating resins (relative dielectric constant at 1 MHz is about 2.1), so that the insulator can be made thin while keeping the same capacitance as compared to the case of using other resins. .
- the insulator 13 has an outer diameter D1 of about 0.2 mm, and has a relatively high capacitance of 90 to 120 pF / m.
- the external conductor 15 is a bare copper wire (an annealed copper wire or a copper alloy wire), a silver-plated or tin-plated anodized copper wire or a copper alloy wire having the same thickness as that of the wire conductor used for the center conductor 12. It is formed on the outer periphery with a horizontal winding or a braided structure. Further, in order to improve the shielding function, a metal foil tape may be provided in the layer immediately outside the outer conductor 15.
- the jacket 16 is formed by extruding a resin material such as a fluororesin or winding a resin tape such as a polyester tape.
- the outer diameter of the coaxial cable 11 that is the outer diameter of the jacket 16 is about 0.31 mm.
- the coaxial cable 11 is used for, for example, a cellular phone or a notebook personal computer for antenna wiring, wiring for connecting an LCD (Liquid Crystal Display) and a CPU (Central Processing Unit), or for connecting a sensor and a device. It is often used as a core cable, and the miniaturization and thinning of these terminal devices require a reduction in the diameter of the coaxial cable and a reduction in the diameter of the multi-core cable.
- the coaxial cable 11 needs to have a predetermined impedance (50 ⁇ , 75 ⁇ , or 80 to 90 ⁇ ), and has a diameter as small as possible. For this purpose, it is necessary to reduce the dielectric constant of the insulating layer between the center conductor 12 and the outer conductor 15. In the present embodiment, by providing the gap portion 14 in the insulator 13, the dielectric constant of the insulator 13 can be reduced, and the coaxial cable 11 can have a small diameter and good electrical characteristics.
- the insulator 13 is thin with a small diameter, the strength is reduced, and it may not be able to withstand external pressure and bending applied to the cable.
- the ratio of the void portion 14 to the sum of the area of all the void portions 14 and the area of the insulator 13 is defined as the void ratio
- the void ratio of all the void portions 14 is 18%.
- the withstand voltage between the center conductor 12 and the outer conductor 15 is reliably ensured without causing a decrease in strength.
- the eight gaps 14 formed in a circular cross section are uniformly arranged on the insulator 13 made of PFA, high strength can be maintained while reducing the diameter and reducing the dielectric constant of the insulator 13. Can do.
- the center conductor 12 can be thickened by thinning the insulator 13, and the transmission efficiency is improved by reducing the conductor resistance. Can be achieved.
- the center conductor 12 of AWG # 40 can be used. If the outer diameter of the central conductor 12 is the same, the outer diameter of the coaxial cable 11 can be reduced by reducing the thickness of the insulator 13. Even if the insulated wire does not have the external conductor 15, the same effect as that of the coaxial cable 11 can be obtained by configuring the insulator 13 as described above.
- the eight gaps 14 are formed in the insulator 13, but the number of the gaps 14 is not limited to eight and may be six or seven. Moreover, although the case where the cross-sectional circle-shaped space
- coaxial cable 11 has been described as an example of a single-core wire, the coaxial cable 11 or a multi-core cable in which a plurality of insulated wires are bundled may be used.
- the multi-core cable may include only a coaxial cable, may include only an insulated wire, or may include both. Furthermore, it is good also as a multi-core coaxial cable which shielded the coaxial cable or the insulated wire with the common shield conductor.
- the coaxial cable 11 or the insulated wire can be manufactured using an extruder 30 in which a die 31 and a point 41 are combined.
- a member 45 having a columnar outer shape is provided at the point 41 by the number of the gap portions 14 and is combined with the die 31 having the circular outlet 33 to push out the resin from between the point 41 and the die 31 (channels 51 and 52).
- the central conductor 12 is pulled out from the central hole 44 of the cylindrical portion 43 of the point 41.
- the extruded resin is coated on the central conductor 12.
- the resin may be coated by a pulling-down method in which the resin exiting the die 31 is stretched to reduce the diameter. Resin does not flow through the cylindrical member 45, and this portion becomes the gap portion 14. If the air hole 46 is provided in the member 45, the void portion 14 through which the resin does not flow is secured in the resin extruded from the die 31, and the cross section becomes circular or elliptical.
- the porosity of the insulator 13 can be easily adjusted by the diameter of the columnar member 45 provided at the point 41.
- the thing with a low porosity has a high freedom degree of the combination of the die
- an example product and a comparative example product of the present invention were manufactured and tested.
- a stranded wire having an outer diameter of 0.09 mm obtained by twisting seven tin-plated copper alloy wires having an outer diameter of 0.03 mm is used as the central conductor.
- a fluororesin (PFA) was extrusion coated to form an insulator having an outer diameter of 0.20 mm.
- the cylindrical member 45 that forms the void as shown in FIG. 2 is used to uniformly form eight voids having a circular section in the longitudinal direction in the insulator. did.
- a tin-plated annealed copper wire having an outer diameter of 0.03 mm was horizontally wound, and a jacket made of polyester tape was formed thereon to form an AWG # 40 coaxial cable having an outer diameter of 0.31 mm.
- the overall porosity of the voids in the insulator is 18% (capacitance 110 pF / m) in Example 1, 35% (capacitance 100 pF / m) in Example 2, and 40% (static) in Comparative Example 1.
- the capacitance was 95 pF / m).
- Comparative Example 2 a coaxial cable without a void (void ratio 0%) was produced.
- a stranded wire having an outer diameter of 0.075 mm obtained by twisting seven silver-plated copper alloy wires having an outer diameter of 0.025 mm is used as the central conductor, and fluororesin (PFA) is extrusion coated thereon.
- PFA fluororesin
- an insulator having an outer diameter of 0.20 mm was obtained.
- As the outer conductor a tin-plated annealed copper wire having an outer diameter of 0.03 mm was wound horizontally, and a jacket made of polyester tape was formed thereon to form an AWG # 42 coaxial cable having an outer diameter of 0.31 mm.
- the capacitance was 110 pF / m.
- the coaxial cable of each test product was subjected to the following test three times, and each coaxial cable was evaluated.
- (1) Withstand voltage test An AC voltage was applied between the center conductor and the outer conductor, and a voltage value was measured when the insulator was broken and the center conductor and the outer conductor were short-circuited.
- (2) Dynamic cut-through From the top of the outer sheath of the coaxial cable, it is crushed by applying pressure with a round blade, and the load when the center conductor and the outer conductor are short-circuited is measured.
- the round blade was made of SUS and the tip diameter r was 1 mm.
- Table 1 shows the test results.
- the numerical value of Table 1 is an average value of a test result of every 3 times.
- the withstand voltage was 5.6 kV on average and the load of dynamic cut-through was 27.7 N on average.
- the coaxial cable of Example 1 was found to have sufficient withstand voltage and strength, and the reliability evaluation was good ( ⁇ ).
- the withstand voltage was an average value of 4.4 kV
- the dynamic cut-through load was an average value of 25.2 N.
- the coaxial cable of Example 2 was found to have sufficient withstand voltage and strength, and the evaluation of reliability was good ( ⁇ ).
- the coaxial cable of Comparative Example 2 in which the void ratio of the void portion is 0% has the same capacitance as that of Example 1.
- the withstand voltage and the load of dynamic cut-through are the same as in Example 1.
- the coaxial cable of the comparative example 2 is AWG and is one size smaller than the coaxial cable of the first embodiment in terms of allowable current and conductor resistance.
- the outer diameter is 0.34 mm, the outer diameter is increased by about 10%, and does not satisfy the demand for reducing the diameter. .
- the coaxial cable of AWG # 40 was evaluated.
- the void ratio of the entire void portion was 18%. In the case of 35%, the evaluation was good.
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- Communication Cables (AREA)
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Abstract
Description
しかし、空隙部の空隙率が大き過ぎると、中心導体と外部導体との間の耐電圧が低下してしまう。また、空隙率が大きいと強度低下を招くおそれもあり、特に、空隙部の断面が扇状であると、曲げに対して空隙部が変形しやすくなり、外圧によってケーブルが潰れて伝送特性の安定確保が難しくなるおそれがある。
前記空隙部は断面が円形または楕円形状に形成され、6~8個の前記空隙部が前記絶縁体に均等に配され、ケーブル長さ方向に垂直な断面において全ての空隙部の面積と絶縁体の面積の和に対する空隙部の面積の割合を空隙率とするときに、全部の空隙部を合わせた空隙率を18%以上35%以下としたことを特徴とする。
本発明の同軸ケーブルは、中心導体を、長手方向に連続する空隙部を有する絶縁体で覆い、前記絶縁体の外周に外部導体を配した同軸ケーブルであって、
前記空隙部は断面が円形または楕円形状に形成され、6~8個の前記空隙部が前記絶縁体に均等に配され、ケーブル長さ方向に垂直な断面において全ての空隙部の面積と絶縁体の面積の和に対する空隙部の面積の割合を空隙率とするときに、全部の空隙部を合わせた空隙率を18%以上35%以下としたことを特徴とする。
図1に示すように、本実施形態に係る同軸ケーブル11は、中心導体12を絶縁体13で覆い、絶縁体13の外周に外部導体15を配し、その外側を外被16で覆って保護した構成である。同軸ケーブル11の中心導体12と絶縁体13の部分は、本発明の絶縁電線においても同じ構成である。
絶縁体13は、その外径D1が約0.2mmとされており、また、静電容量は、90~120pF/mと比較的高くされている。
そして、この外被16の外径である同軸ケーブル11の外径は、約0.31mmとされている。
中心導体12の外径を同じとすれば、絶縁体13の薄肉化により同軸ケーブル11の外径を小さくできる。
外部導体15を有しない絶縁電線であっても、絶縁体13を上記の構成とすることにより上記の同軸ケーブル11と同様の効果を享受することができる。
ポイント41に外形が円柱状の部材45を空隙部14の数だけ設け、円形の出口33を有するダイス31に組み合わせてポイント41とダイス31の間(流路51,52)から樹脂を押し出す。ポイント41の円筒部43の中心孔44から中心導体12を引き出す。押し出された樹脂が中心導体12に被覆される。ダイス31の出口を出た樹脂を引き伸ばして径を小さくして被覆する引き落とし方法により樹脂を被覆してもよい。円柱状の部材45には樹脂が流れず、この部分が空隙部14となる。この部材45に通気孔46を設けておくとダイス31から押し出された樹脂中に樹脂が流れない空隙部14が確保され、その断面が円形または楕円形となる。
(1)耐電圧試験
中心導体と外部導体との間に交流の電圧を印加し、絶縁体が破壊して中心導体と外部導体との間がショートした際の電圧値を測定した。
(2)ダイナミックカットスルー
同軸ケーブルの外被の上から、丸刃で圧をかけて潰していき、中心導体と外部導体とがショートした際の荷重を測定する。なお、丸刃は、材質をSUSとし、先端径rを1mmとした。
なお、実施例1と同寸法の中心導体を使用して空隙部のない同軸ケーブルを作製するとその外径は0.34mmとなり、外径が1割程度大きくなり、細径化の要求を満たさない。
Claims (5)
- 中心導体を、長手方向に連続する空隙部を有する絶縁体で覆った絶縁電線であって、
前記空隙部は断面が円形または楕円形状に形成され、6~8個の前記空隙部が前記絶縁体に均等に配され、ケーブル長さ方向に垂直な断面において全ての空隙部の面積と絶縁体の面積の和に対する空隙部の面積の割合を空隙率とするときに、全部の空隙部を合わせた空隙率を18%以上35%以下としたことを特徴とする絶縁電線。 - 請求項1に記載の絶縁電線であって、
前記絶縁体は、テトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体から形成されていることを特徴とする絶縁電線。 - 中心導体を、長手方向に連続する空隙部を有する絶縁体で覆い、前記絶縁体の外周に外部導体を配した同軸ケーブルであって、
前記空隙部は断面が円形または楕円形状に形成され、6~8個の前記空隙部が前記絶縁体に均等に配され、ケーブル長さ方向に垂直な断面において全ての空隙部の面積と絶縁体の面積の和に対する空隙部の面積の割合を空隙率とするときに、全部の空隙部を合わせた空隙率を18%以上35%以下としたことを特徴とする同軸ケーブル。 - 請求項3に記載の同軸ケーブルであって、
前記絶縁体は、テトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体から形成されていることを特徴とする同軸ケーブル。 - 請求項1もしくは2に記載の絶縁電線または請求項3もしくは4に記載の同軸ケーブルを、複数本収納してなることを特徴とする多心ケーブル。
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JP2012520603A JP6164844B2 (ja) | 2010-12-01 | 2011-11-30 | 絶縁電線、同軸ケーブル及び多心ケーブル |
CN2011800044131A CN102687208A (zh) | 2010-12-01 | 2011-11-30 | 绝缘电线、同轴电缆及多芯电缆 |
KR1020127010929A KR101852205B1 (ko) | 2010-12-01 | 2011-11-30 | 절연 전선, 동축 케이블 및 다심 케이블 |
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US20150162854A1 (en) * | 2013-12-10 | 2015-06-11 | Rps International | System and Method for Stimulating Rainfall |
JP6015705B2 (ja) * | 2014-04-16 | 2016-10-26 | 住友電気工業株式会社 | 生地及び装着具 |
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JP2004119060A (ja) * | 2002-09-24 | 2004-04-15 | Sumitomo Electric Ind Ltd | ディジタル信号差動伝送用ケーブル、その製造方法およびこれを用いたハーネス |
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WO2010035762A1 (ja) * | 2008-09-24 | 2010-04-01 | 住友電気工業株式会社 | 同軸ケーブルおよび多心同軸ケーブル |
WO2010064579A1 (ja) * | 2008-12-02 | 2010-06-10 | 株式会社フジクラ | 伝送ケーブル及びそれを用いた信号伝送ケーブル |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2021106131A (ja) * | 2019-12-26 | 2021-07-26 | 住友電気工業株式会社 | 電気絶縁ケーブル |
JP7443766B2 (ja) | 2019-12-26 | 2024-03-06 | 住友電気工業株式会社 | 電気絶縁ケーブル |
Also Published As
Publication number | Publication date |
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JP6164844B2 (ja) | 2017-07-19 |
CN105788748A (zh) | 2016-07-20 |
CN102687208A (zh) | 2012-09-19 |
JPWO2012074002A1 (ja) | 2014-05-19 |
KR101852205B1 (ko) | 2018-04-25 |
KR20140001728A (ko) | 2014-01-07 |
CN105788748B (zh) | 2018-10-02 |
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