WO2016104066A1 - Signal transmission flat cable - Google Patents

Signal transmission flat cable Download PDF

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Publication number
WO2016104066A1
WO2016104066A1 PCT/JP2015/083683 JP2015083683W WO2016104066A1 WO 2016104066 A1 WO2016104066 A1 WO 2016104066A1 JP 2015083683 W JP2015083683 W JP 2015083683W WO 2016104066 A1 WO2016104066 A1 WO 2016104066A1
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Prior art keywords
electrically insulating
thin film
layer
cable
signal transmission
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PCT/JP2015/083683
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French (fr)
Japanese (ja)
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市毛　敏明
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株式会社湘南合成樹脂製作所
株式会社テクノ・コア
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Priority to JP2016566065A priority Critical patent/JPWO2016104066A1/en
Publication of WO2016104066A1 publication Critical patent/WO2016104066A1/en

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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
    • H01B7/08—Flat or ribbon cables
    • 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
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring

Definitions

  • the present invention relates to a flat cable for signal transmission that is thin and has excellent electrical characteristics, and more particularly to a flat cable for signal transmission suitable for internal wiring of a mobile phone, a notebook computer, or the like.
  • Signal transmission flat cables used in high-density wiring electronic devices such as mobile phones and laptop computers are required to be thin and have low transmission loss in the high-frequency band in order to enable wiring in narrow spaces. Is done.
  • a signal transmission flat cable a signal conductor made of a metal thin film, a ground conductor made of a metal thin film, disposed on both sides of the signal conductor in the cable width direction, and an electric insulating base body laminated with the signal conductor and the ground conductor And an upper insulating thin film layer and a lower electrically insulating thin film layer covering these signal conductor, ground conductor and electric insulating base from above and below in the cable thickness direction, and an electrically insulating plastic layer is laminated on one surface of the metal layer,
  • Patent Documents 1 and 2 a coaxial cable provided with an upper insulating thin film layer and a protective shielding layer provided directly on the outer periphery of the lower electrically insulating thin film layer so that the electrically insulating plastic layer is on the outside.
  • the ground conductor made of a metal thin film is formed as a ground pattern and is electrically connected to the metal layer of the protective shielding layer to stabilize the high frequency characteristics.
  • JP 2011-119198 A Japanese Patent No. 5534628
  • a ground pattern serving as a ground conductor and a protective shielding layer are provided, and these are grounded to an external ground via a terminal connector portion. is doing.
  • the ground pattern and the protective shielding layer are provided, the ground pattern is bent at both ends in the width direction for electrical connection thereof, and the bent portion of the protective shielding layer is formed. It was in contact with the metal layer.
  • the ground pattern is made of copper foil and is extremely thin (about 0.01 mm), it is technically difficult to fold the ground pattern, which is a factor that deteriorates workability.
  • a ground conductor is provided between the signal conductors, but the ground conductor between them can be connected to the shield only at the end compared to the ground conductors at both ends.
  • the electrical connection is poor, there is a problem that the high-frequency characteristics are not stable and the quality is lowered due to the floating state.
  • the present invention has been made to solve such problems, and it is an object of the present invention to provide a flat cable for signal transmission that can improve work for grounding and can stabilize high-frequency characteristics.
  • the present invention which achieves the above-described problems
  • One or more signal conductors made of a metal thin film extending in the cable length direction;
  • a protective shielding layer comprising a metal layer and an electrically insulating plastic layer, and surrounding the outer periphery of the upper electrically insulating thin film layer and the lower electrically insulating thin film layer such that the metal layer is located on the inner side and the electrically insulating plastic layer is located on the outer side.
  • An electrical connection to the ground is made through the metal layer of the protective shielding layer.
  • FIG. 1 is a perspective view showing a part of a flat cable 100 for signal transmission showing an embodiment of the present invention in a crossing manner.
  • the flat cable 100 is configured as a multi-core coaxial cable, and two signal conductors 1 and 2 made of a metal thin film are disposed on one surface of the electrically insulating base 3 on a plane.
  • the signal conductors 1 and 2 are arranged extending in the cable length direction in parallel with each other.
  • two signal conductors 1 and 2 are provided.
  • the number of signal conductors is not limited to two, and a plurality of signal conductors can be provided.
  • the cable width direction is a direction indicated by W extending in the left-right direction in FIG. 1 in a direction orthogonal to the cable longitudinal direction indicated by L in FIG. 1 in which the signal transmission flat cable 100 extends.
  • the cable thickness direction is a direction indicated by D extending vertically in FIG.
  • the signal transmission flat cable 100 includes an upper electrically insulating thin film layer 4 and a lower electrically insulating thin film layer 5, and these electrically insulating thin film layers 4 and 5 connect the signal conductors 1 and 2 and the electrically insulating substrate 3 in the cable thickness direction. It is provided so as to cover from above and below.
  • the metal layer 6 of the protective shielding layer 8 is grounded to an external ground via a terminal connector (not shown), and the signal transmission flat cable 100 is interposed via the metal layer 6 of the protective shielding layer 8. Electrical connection to ground is made.
  • the protective shielding layer 8 is formed so as to surround the upper electric insulating thin film layer 4 and the lower electric insulating thin film layer 1 in the cable cross section by making one end face abut the other end edge in the cable longitudinal direction. ing. That is, the protective shielding layer 8 has a butt portion 8a formed by abutting both end edges continuously in the cable longitudinal direction in the vicinity of the upper left corner of the cable cross section.
  • the protective shielding layer 8 is preferably abutted so that the abutting portion 8a is formed as far away from the signal conductors 1 and 2 as possible.
  • the butting portion 8a is located at the left end in FIG. 1, but may be located at the right end. In this way, by separating the butting portion 8a from the signal conductors 1 and 2, the influence on the signal conductor is reduced, and a decrease in signal transmission characteristics in the high frequency band can be suppressed.
  • the protective shielding layer 8 in which the metal layer 6 and the electrically insulating plastic layer 7 are laminated and integrated is formed on the outer periphery of the upper electrically insulating thin film layer 4 and the lower electrically insulating thin film layer 5, the protective shielding layer 8 is viewed from above and below.
  • heat and pressure hot pressing
  • the upper electric insulating thin film layer 4 and the lower electric insulating thin film layer 5 are softened and melted and integrated with the metal layer 6, thereby causing the protective shielding layer 8 to be deformed. Can be prevented.
  • the thicknesses of the upper electrically insulating thin film layer 4 and the lower electrically insulating thin film layer 5 at the time of heating and pressing are constant over the entire cable width, and the high frequency frequency It is possible to suppress a decrease in signal transmission characteristics in the band.
  • the signal conductors 1 and 2 are made of a highly conductive metal, and specifically, copper (conductivity: 5.76 ⁇ 10 7 Siemens / m), which is commonly used as a highly conductive metal industrially. Can be formed by laminating the foil into the electrically insulating thin film layer 4 or the electrically insulating substrate 3 or by depositing or plating copper on the electrically insulating thin film layer 4 or the electrically insulating substrate 3. As the metal other than copper, aluminum (conductivity: 3.96 ⁇ 10 7 Siemens / m) can be given.
  • the metal layer 6 that forms the protective shielding layer 8 is preferably formed of a highly conductive metal such as copper or aluminum, like the signal conductor 1.
  • the thickness of the upper electrically insulating thin film layer 4 is 0.125 mm
  • the thickness of the electrically insulating base 3 is 0.025 mm
  • the thickness of the lower electrically insulating thin film layer 5 is 0.100 mm.
  • Single-core coaxial flat for signal transmission having the same signal transmission characteristics as a round coaxial cable with characteristic impedance of 50 ⁇ , with the thicknesses of the upper and lower insulators of signal conductors 1 and 2 being equal (each 0.125 mm)
  • the cable 100 is realized.
  • a copper-clad laminate obtained by laminating a 0.025 mm thick electrically insulating base and a copper foil is commercially available. By using such a commercially available product, the cost of a flat cable for signal transmission can be reduced. .
  • the upper electrically insulating thin film layer 4 and the lower electrically insulating thin film layer 5 are made of a thermoplastic resin material having a property of being melt-bonded by heating, and the upper electrically insulating thin film layer 4 and the lower electrically insulating thin film layer 4 are heated by heat applied from the outside of the protective shielding layer 8.
  • the upper electric insulating thin film layer 4 and the lower electric insulating thin film layer 5 and the protective shielding layer 8 are hardly peeled off.
  • the upper electric insulating thin film layer 4 and the lower electric insulating thin film layer 5 and the metal layer 6 are directly bonded without an adhesive which causes an increase in transmission loss. Transmission is possible.
  • the electrically insulating plastic layer 7 is made of polyimide having heat resistance, thin film properties, mechanical strength, and slipperiness.
  • the protective shielding layer 8 is formed by laminating the metal layer 6 on the inner side and the electrically insulating plastic layer 7 on the outer side with an adhesive such as thermoplastic polyimide interposed therebetween.
  • the lower electrically insulating thin film layer 5 is enclosed at once.
  • the upper electrically insulating thin film layer 4, the lower electrically insulating thin film layer 5 and the electrically insulating substrate 3 have a property of being melt-bonded by heating, and are materials having a low dielectric constant and dielectric loss tangent in a high frequency band exceeding 2 GHz.
  • examples of such a material include liquid crystal polymer and polytetrafluoroethylene.
  • the liquid crystal polymer is a thermoplastic resin that exhibits optical anisotropy when melted. Specifically, it is a fully aromatic or semi-aromatic polyester, polyesterimide, polyesteramide, or a resin composition containing these. Among them, a liquid crystal polyester resin composition having (A) a liquid crystal polyester as a continuous phase and (B) a copolymer having a functional group having reactivity with the liquid crystal polyester as a dispersed phase is preferable.
  • the grounding is performed through the metal layer 6 of the protective shielding layer 8, it is not necessary to provide the grounding conductor on the electrically insulating base 3 on which the signal conductors 1 and 2 are laminated. Therefore, the electrical connection work between the grounding conductor for grounding and the metal layer 6 of the protective shielding layer 8 which is conventionally required is eliminated, and the workability is improved. In addition, the instability of the high frequency characteristics due to the poor electrical connection that occurs during such electrical connection work for grounding is eliminated, and the quality can be improved.
  • a copper foil C is laminated on the upper surface of the electrically insulating base 3 (FIG. 2A), and the signal conductors 1 and 2 are formed by etching the copper foil C (FIG. 2B).
  • the upper electric insulating thin film layer 4 is laminated on the signal conductors 1 and 2 and the lower electric insulating thin film layer 5 is provided below the electric insulating substrate 3 (FIG. 2 (c)), FIG. 2 (d).
  • FIG. 4 by covering the outer periphery of the upper electrical insulating thin film layer 4 and the lower electrical insulating thin film layer 5 with a protective shielding layer 8 and applying heat and pressure (hot pressing) from above and below the protective shielding layer 8, The upper electric insulating thin film layer 4 and the lower electric insulating thin film layer 5 are softened and melted and bonded to the metal layer 6 to produce a signal transmission flat cable 100 as shown in FIG.
  • FIG. 3 shows a signal transmission flat cable 200 configured as a single-core coaxial cable.
  • the configuration is the same as that of the signal transmission flat cable 200 according to the first embodiment, except that one signal conductor 10 is provided on the electrical insulating base 3 at substantially the center in the width direction W.
  • the signal transmission flat cable 200 can be manufactured in the same manner as in the first embodiment by the method shown in FIG.
  • no ground conductor is provided on the electrically insulating base 3, and the signal transmission flat cable 200 is electrically connected to the ground via the metal layer 6 of the protective shielding layer 8. Done. Accordingly, it is not necessary to provide a ground conductor on the electrically insulating base 3 as in the first embodiment, so that workability for grounding is improved and high-frequency characteristics can be stabilized and quality can be improved.
  • 4A and 4B show a signal transmission flat cable 300 configured as a multi-core coaxial cable and a signal transmission flat cable 400 configured as a single-core coaxial cable.
  • the protective shielding layer 8 has both end edges continuously abutted in the cable longitudinal direction to form the abutting portion 8a.
  • FIGS. 4 (a) and 4 (b) In the embodiment shown in FIG. 1, one end edge 6 a, 7 a of each of the metal layer 6 of the protective shielding layer 8 and the electrically insulating plastic layer 7 is overlaid on the other edge of the electrically insulating plastic device 7. Thereby, in the protective shielding layer 8, one end edge portion along the cable longitudinal direction is overlapped on the outer side of the other end edge portion to form an overlapping portion 8a '.
  • the flat cable 300 and the flat cable 400 are the same as the flat cable 100 and the flat cable 200 shown in the first and second embodiments, respectively.
  • Examples 1, 2, and 3 the example in which the flat cable for signal transmission is mainly used for high-density wiring electronic devices such as mobile phones and notebook computers has been described.
  • the present invention is not limited to this.
  • the present invention can also be applied to a wire harness in which a plurality of signal conductor wires used for power supply and signal communication of automobiles and other electronic devices are bundled.

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  • Insulated Conductors (AREA)

Abstract

Provided is a signal transmission flat cable that is capable of suppressing a decrease in signal transmission characteristics in a high-frequency frequency band. An upper electric insulation thin film layer 4 and a lower electric insulation thin film layer 5 are provided, whereby signal conductors 1, 2 and an electric insulation base body 3 are covered from the top and the bottom in the cable thickness direction. A protective insulation layer 8 comprises a metal layer 6 and an electric insulation plastic layer 7, and surrounds the outer periphery of the upper and lower electric insulation thin film layers in such a manner as to position the metal layer on the inside, and the electric insulation plastic layer on the outside. Grounding of the cable is achieved through the metal layer 6 of the protective insulation layer 8.

Description

信号伝送用フラットケーブルFlat cable for signal transmission
　本発明は、薄型でかつ優れた電気特性を有する信号伝送用フラットケーブル、特に、携帯電話やノートパソコン等の内部配線に適した信号伝送用フラットケーブルに関するものである。 The present invention relates to a flat cable for signal transmission that is thin and has excellent electrical characteristics, and more particularly to a flat cable for signal transmission suitable for internal wiring of a mobile phone, a notebook computer, or the like.
　携帯電話やノートパソコンのような高密度配線電子機器に使用される信号伝送用フラットケーブルには、狭い空間での配線を可能とするために薄型でかつ高周波帯域での伝送損失が小さいことが要求される。 Signal transmission flat cables used in high-density wiring electronic devices such as mobile phones and laptop computers are required to be thin and have low transmission loss in the high-frequency band in order to enable wiring in narrow spaces. Is done.
　このような信号伝送用フラットケーブルとして、金属薄膜からなる信号導体と、信号導体のケーブル幅方向の両側に配置され、金属薄膜からなる接地導体と、信号導体および接地導体が積層された電気絶縁基体と、これらの信号導体、接地導体および電気絶縁基体をケーブル厚さ方向の上下から被覆する上部電気絶縁薄膜層および下部電気絶縁薄膜層と、金属層の一方面に電気絶縁プラスチック層が積層され、電気絶縁プラスチック層が外側となるようにして上部電気絶縁薄膜層および下部電気絶縁薄膜層の直接外周に設けられた保護遮蔽層とを備えた同軸ケーブルが提案されている（特許文献１、２）。 As such a signal transmission flat cable, a signal conductor made of a metal thin film, a ground conductor made of a metal thin film, disposed on both sides of the signal conductor in the cable width direction, and an electric insulating base body laminated with the signal conductor and the ground conductor And an upper insulating thin film layer and a lower electrically insulating thin film layer covering these signal conductor, ground conductor and electric insulating base from above and below in the cable thickness direction, and an electrically insulating plastic layer is laminated on one surface of the metal layer, There has been proposed a coaxial cable provided with an upper insulating thin film layer and a protective shielding layer provided directly on the outer periphery of the lower electrically insulating thin film layer so that the electrically insulating plastic layer is on the outside (Patent Documents 1 and 2). .
　これらの同軸ケーブルでは、金属薄膜からなる接地導体は、グランドパターンとして形成され、保護遮蔽層の金属層と電気的に接続させ、高周波特性を安定化させている。 In these coaxial cables, the ground conductor made of a metal thin film is formed as a ground pattern and is electrically connected to the metal layer of the protective shielding layer to stabilize the high frequency characteristics.
特開２０１１－１１９１９８号公報JP 2011-119198 A 特許第５５３４６２８号公報Japanese Patent No. 5534628
　特許文献１、２に記載された構成では、同軸ケーブルの接地のために、接地導体となるグランドパターンと、保護遮蔽層の二つを設け、これらを端末コネクター部を介して外部のグランドに接地している。このように、従来では、グランドパターンと保護遮蔽層の二つを設けたために、これらの電気的な接続のために、グランドパターンを幅方向の両端部において折り曲げ、その折り曲げ部を保護遮蔽層の金属層と接触させていた。 In the configuration described in Patent Documents 1 and 2, for grounding the coaxial cable, a ground pattern serving as a ground conductor and a protective shielding layer are provided, and these are grounded to an external ground via a terminal connector portion. is doing. Thus, conventionally, since the ground pattern and the protective shielding layer are provided, the ground pattern is bent at both ends in the width direction for electrical connection thereof, and the bent portion of the protective shielding layer is formed. It was in contact with the metal layer.
　しかしながら、グランドパターンは銅箔からなり極めて薄いので（約０.０１ｍｍ）、それを折り曲げることは、技術的に難度が高く、作業性を悪くする要因となっていた。 However, since the ground pattern is made of copper foil and is extremely thin (about 0.01 mm), it is technically difficult to fold the ground pattern, which is a factor that deteriorates workability.
　また、特に信号導体が複数ある場合（多芯の場合）、信号導体間に接地導体が設けられるが、その間の接地導体は、両端の接地導体と比較して、端末部でしかシールドと接続せず、電気的な接続が悪いため、高周波的に浮いた状態となって高周波特性が安定せず、品質を低下させるという問題があった。 Also, especially when there are multiple signal conductors (multi-core), a ground conductor is provided between the signal conductors, but the ground conductor between them can be connected to the shield only at the end compared to the ground conductors at both ends. In addition, since the electrical connection is poor, there is a problem that the high-frequency characteristics are not stable and the quality is lowered due to the floating state.
　本発明は、このような問題点を解決するためになされたもので、接地のための作業を改善でき、高周波特性を安定させることができる信号伝送用フラットケーブルを提供することを課題とする。 The present invention has been made to solve such problems, and it is an object of the present invention to provide a flat cable for signal transmission that can improve work for grounding and can stabilize high-frequency characteristics.
　上記課題を達成する本発明は、
　ケーブル長さ方向に延びる金属薄膜からなる一つ又は複数の信号導体と、
　前記信号導体が積層された電気絶縁基体と、
　前記信号導体および電気絶縁基体をケーブル厚さ方向の上下から被覆する上部電気絶縁薄膜層および下部電気絶縁薄膜層と、
　金属層と電気絶縁プラスチック層からなり、金属層が内側に、電気絶縁プラスチック層が外側に位置するように前記上部電気絶縁薄膜層および下部電気絶縁薄膜層の外周を包囲する保護遮蔽層と、を備え、
　前記保護遮蔽層の金属層を介してグランドとの電気的な接続が行われることを特徴とする。 The present invention which achieves the above-described problems
One or more signal conductors made of a metal thin film extending in the cable length direction;
An electrically insulating substrate on which the signal conductor is laminated;
An upper electrically insulating thin film layer and a lower electrically insulating thin film layer covering the signal conductor and the electrically insulating base from above and below in the cable thickness direction;
A protective shielding layer comprising a metal layer and an electrically insulating plastic layer, and surrounding the outer periphery of the upper electrically insulating thin film layer and the lower electrically insulating thin film layer such that the metal layer is located on the inner side and the electrically insulating plastic layer is located on the outer side. Prepared,
An electrical connection to the ground is made through the metal layer of the protective shielding layer.
　このような構成では、保護遮蔽層の金属層を介して接地が行われるので、信号導体が積層される電気絶縁基体上に接地導体を設けて接地を行う必要がなくなり、従来必要であった接地のための接地導体と保護遮蔽層の金属層との電気的接続作業がなくなって作業性が改善する。また、このような接地のための電気的接続作業を行っていたとき発生した電気的接続不良による高周波特性の不安定さがなくなり、品質を向上させることができる。 In such a configuration, since the grounding is performed through the metal layer of the protective shielding layer, it is not necessary to provide a grounding conductor on the electrically insulating base on which the signal conductors are laminated, and the grounding which has been conventionally required Therefore, the electrical connection work between the grounding conductor and the metal layer of the protective shielding layer is eliminated, and the workability is improved. In addition, the instability of the high frequency characteristics due to the poor electrical connection that occurs during such electrical connection work for grounding is eliminated, and the quality can be improved.
本発明の信号伝送用フラットケーブルの一部を横断して示した斜視図である。It is the perspective view which showed a part of flat cable for signal transmission of the present invention transversely. 信号伝送用フラットケーブルの製造方法を説明する説明図である。It is explanatory drawing explaining the manufacturing method of the flat cable for signal transmission. 信号伝送用フラットケーブルの他の実施例を示す斜視図である。It is a perspective view which shows the other Example of the flat cable for signal transmission. （ａ）、（ｂ）は信号伝送用フラットケーブルの更に他の実施例を示す斜視図である。(A), (b) is a perspective view which shows other Example of the flat cable for signal transmission.
　以下、図面に示す実施例に基づいて本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
　図１は本発明の一実施例を示す信号伝送用フラットケーブル１００の一部を横断で示した斜視図である。フラットケーブル１００は多芯同軸ケーブルとして構成されており、電気絶縁基体３の一方面に金属薄膜からなる２つの信号導体１、２が平面上に配置されている。信号導体１、２は、互いに平行してケーブル長さ方向に延びて配置される。図１では、２つの信号導体１、２が設けられているが、信号導体は、２つに限定されるものでなく、それ以上の複数の信号導体を設けることもできる。 FIG. 1 is a perspective view showing a part of a flat cable 100 for signal transmission showing an embodiment of the present invention in a crossing manner. The flat cable 100 is configured as a multi-core coaxial cable, and two signal conductors 1 and 2 made of a metal thin film are disposed on one surface of the electrically insulating base 3 on a plane. The signal conductors 1 and 2 are arranged extending in the cable length direction in parallel with each other. In FIG. 1, two signal conductors 1 and 2 are provided. However, the number of signal conductors is not limited to two, and a plurality of signal conductors can be provided.
　本明細書において、ケーブル幅方向とは、信号伝送用フラットケーブル１００が長く延びる図１でＬで示したケーブル長手方向と直交する方向で、図１で左右に延びるＷで示した方向である。また、ケーブル厚さ方向は、Ｌ、Ｗと直交する図１で上下に延びるＤで示した方向である。 In this specification, the cable width direction is a direction indicated by W extending in the left-right direction in FIG. 1 in a direction orthogonal to the cable longitudinal direction indicated by L in FIG. 1 in which the signal transmission flat cable 100 extends. The cable thickness direction is a direction indicated by D extending vertically in FIG.
　信号伝送用フラットケーブル１００は上部電気絶縁薄膜層４および下部電気絶縁薄膜層５を有し、これらの電気絶縁薄膜層４、５は、信号導体１、２および電気絶縁基体３をケーブル厚さ方向の上下から被覆するように設けられている。また、上部電気絶縁薄膜層４および下部電気絶縁薄膜層５の直接外周には、金属層６の一方面に電気絶縁プラスチック層７が積層された保護遮蔽層８が、電気絶縁プラスチック層７が外側となるようにして設けられている。 The signal transmission flat cable 100 includes an upper electrically insulating thin film layer 4 and a lower electrically insulating thin film layer 5, and these electrically insulating thin film layers 4 and 5 connect the signal conductors 1 and 2 and the electrically insulating substrate 3 in the cable thickness direction. It is provided so as to cover from above and below. In addition, a protective shielding layer 8 in which an electrically insulating plastic layer 7 is laminated on one surface of a metal layer 6 is provided on the outer periphery of the upper electrically insulating thin film layer 4 and the lower electrically insulating thin film layer 5. It is provided as follows.
　本実施例では、保護遮蔽層８の金属層６は、端末コネクター部（不図示）を介して外部のグランドに接地され、信号伝送用フラットケーブル１００は保護遮蔽層８の金属層６を介してグランドとの電気的な接続が行われる。 In this embodiment, the metal layer 6 of the protective shielding layer 8 is grounded to an external ground via a terminal connector (not shown), and the signal transmission flat cable 100 is interposed via the metal layer 6 of the protective shielding layer 8. Electrical connection to ground is made.
　保護遮蔽層８は、ケーブル長手方向において一方の端縁部を他方の端縁部に突き合わせることにより上部電気絶縁薄膜層４および下部電気絶縁薄膜層５をケーブル横断面において一周包囲して形成されている。すなわち、保護遮蔽層８は、ケーブル横断面の左上隅付近において両端縁部がケーブル長手方向に連続して突き合わされて突合せ部８ａを形成している。 The protective shielding layer 8 is formed so as to surround the upper electric insulating thin film layer 4 and the lower electric insulating thin film layer 1 in the cable cross section by making one end face abut the other end edge in the cable longitudinal direction. ing. That is, the protective shielding layer 8 has a butt portion 8a formed by abutting both end edges continuously in the cable longitudinal direction in the vicinity of the upper left corner of the cable cross section.
　保護遮蔽層８は、突合せ部８ａが可能な限り信号導体１、２から離間した位置に形成されるように、突き合わせるのが好ましい。突合せ部８ａは、図１では、左側の端部に位置しているが、右側の端部に位置させるようにしてもよい。このように、突合せ部８ａを信号導体１、２から離間させることにより、信号導体に与える影響が少なくなり、高周波周波数帯域における信号伝送特性の低下を抑止することができる。 The protective shielding layer 8 is preferably abutted so that the abutting portion 8a is formed as far away from the signal conductors 1 and 2 as possible. The butting portion 8a is located at the left end in FIG. 1, but may be located at the right end. In this way, by separating the butting portion 8a from the signal conductors 1 and 2, the influence on the signal conductor is reduced, and a decrease in signal transmission characteristics in the high frequency band can be suppressed.
　金属層６と電気絶縁プラスチック層７とを積層一体化した保護遮蔽層８を上部電気絶縁薄膜層４および下部電気絶縁薄膜層５の外周に被覆形成した状態で、保護遮蔽層８の上下方向から加熱加圧（ホットプレス）を施すことにより、上部電気絶縁薄膜層４および下部電気絶縁薄膜層５が軟化溶融されて金属層６と接着一体化され、これによって、保護遮蔽層８の形崩れを防止できる。また、保護遮蔽層８の両端縁部を突き合わせるようにしているので、加熱加圧時における上部電気絶縁薄膜層４および下部電気絶縁薄膜層５の厚さがケーブル幅全体において一定となり、高周波周波数帯域における信号伝送特性の低下を抑止することが可能となる。 In a state where the protective shielding layer 8 in which the metal layer 6 and the electrically insulating plastic layer 7 are laminated and integrated is formed on the outer periphery of the upper electrically insulating thin film layer 4 and the lower electrically insulating thin film layer 5, the protective shielding layer 8 is viewed from above and below. By applying heat and pressure (hot pressing), the upper electric insulating thin film layer 4 and the lower electric insulating thin film layer 5 are softened and melted and integrated with the metal layer 6, thereby causing the protective shielding layer 8 to be deformed. Can be prevented. Further, since both end edges of the protective shielding layer 8 are abutted with each other, the thicknesses of the upper electrically insulating thin film layer 4 and the lower electrically insulating thin film layer 5 at the time of heating and pressing are constant over the entire cable width, and the high frequency frequency It is possible to suppress a decrease in signal transmission characteristics in the band.
　信号導体１、２は、良導電性の金属で形成されており、具体的には、産業的に良導電性金属として一般的である銅（導電率：５．７６×１０７ジーメンス／ｍ）を箔状に加工したものを電気絶縁薄膜層４あるいは電気絶縁基体３に積層することにより、または銅を電気絶縁薄膜層４あるいは電気絶縁基体３に蒸着あるいはめっきを施すことにより形成することができ、銅以外の金属としてはアルミニウム（導電率：３．９６×１０７ジーメンス／ｍ）をあげることができる。 The signal conductors 1 and 2 are made of a highly conductive metal, and specifically, copper (conductivity: 5.76 × 10 7 Siemens / m), which is commonly used as a highly conductive metal industrially. Can be formed by laminating the foil into the electrically insulating thin film layer 4 or the electrically insulating substrate 3 or by depositing or plating copper on the electrically insulating thin film layer 4 or the electrically insulating substrate 3. As the metal other than copper, aluminum (conductivity: 3.96 × 10 7 Siemens / m) can be given.
　なお、携帯電話やノートパソコンのように２ＧＨｚを越えるような高周波信号が伝送される電子機器では、所謂表皮効果と呼ばれる現象によって数ミクロンの表面層に電流が集中するので、導電率が銅やアルミニウムより小さいニッケルのようなめっき層は伝送損失を増大させることから、このようなめっき層を信号導体１、２の表面に形成しないようにする必要がある。 In electronic devices that transmit high-frequency signals exceeding 2 GHz, such as mobile phones and laptop computers, current concentrates on the surface layer of several microns due to a phenomenon called the skin effect, so that the conductivity is copper or aluminum. Since a smaller plating layer such as nickel increases transmission loss, it is necessary not to form such a plating layer on the surfaces of the signal conductors 1 and 2.
　保護遮蔽層８を形成する金属層６は、信号導体１と同様に、銅またはアルミニウムのような良導電性の金属で形成することが好ましい。 The metal layer 6 that forms the protective shielding layer 8 is preferably formed of a highly conductive metal such as copper or aluminum, like the signal conductor 1.
　本実施例では、上部電気絶縁薄膜層４の厚さを０．１２５ｍｍ、電気絶縁基体３の厚さを０．０２５ｍｍとし、下部電気絶縁薄膜層５の厚さを０．１００ｍｍとすることにより、信号導体１、２の上部と下部の絶縁体の厚さを等しくして（各々０．１２５ｍｍ）、特性インピーダンスが５０Ωの丸型同軸ケーブルと同様の信号伝送特性を有する信号伝送用単芯同軸フラットケーブル１００を実現している。厚さ０．０２５ｍｍの電気絶縁基体と銅箔とを積層した銅張積層板は市販されており、このような市販品を使用することにより、信号伝送用フラットケーブルのコストダウンをはかることができる。 In this example, the thickness of the upper electrically insulating thin film layer 4 is 0.125 mm, the thickness of the electrically insulating base 3 is 0.025 mm, and the thickness of the lower electrically insulating thin film layer 5 is 0.100 mm. Single-core coaxial flat for signal transmission having the same signal transmission characteristics as a round coaxial cable with characteristic impedance of 50Ω, with the thicknesses of the upper and lower insulators of signal conductors 1 and 2 being equal (each 0.125 mm) The cable 100 is realized. A copper-clad laminate obtained by laminating a 0.025 mm thick electrically insulating base and a copper foil is commercially available. By using such a commercially available product, the cost of a flat cable for signal transmission can be reduced. .
　上部電気絶縁薄膜層４および下部電気絶縁薄膜層５は、加熱によって溶融接着する性質を有する熱可塑性樹脂材料からなっており、保護遮蔽層８の外側から加えられる熱によって上部電気絶縁薄膜層４および下部電気絶縁薄膜層５と金属層６とが溶融接着されることにより、上部電気絶縁薄膜層４および下部電気絶縁薄膜層５と保護遮蔽層８とが剥離されにくくなり、保護遮蔽層８の形崩れを防止でき、また、上部電気絶縁薄膜層４および下部電気絶縁薄膜層５と金属層６とは伝送損失の増加要因となる接着剤の介在なしに直接接着されているので、低損失での伝送が可能となる。 The upper electrically insulating thin film layer 4 and the lower electrically insulating thin film layer 5 are made of a thermoplastic resin material having a property of being melt-bonded by heating, and the upper electrically insulating thin film layer 4 and the lower electrically insulating thin film layer 4 are heated by heat applied from the outside of the protective shielding layer 8. By melting and bonding the lower electric insulating thin film layer 5 and the metal layer 6, the upper electric insulating thin film layer 4 and the lower electric insulating thin film layer 5 and the protective shielding layer 8 are hardly peeled off. The upper electric insulating thin film layer 4 and the lower electric insulating thin film layer 5 and the metal layer 6 are directly bonded without an adhesive which causes an increase in transmission loss. Transmission is possible.
　電気絶縁プラスチック層７は、耐熱性、薄膜性、機械的強度、滑り性のあるポリイミドからなっている。保護遮蔽層８は、金属層６を内側、電気絶縁プラスチック層７を外側にして両者を熱可塑性ポリイミドなどの接着剤を介在させて積層形成した状態でケーブル横断面において上部電気絶縁薄膜層４および下部電気絶縁薄膜層５を一括包囲している。 The electrically insulating plastic layer 7 is made of polyimide having heat resistance, thin film properties, mechanical strength, and slipperiness. The protective shielding layer 8 is formed by laminating the metal layer 6 on the inner side and the electrically insulating plastic layer 7 on the outer side with an adhesive such as thermoplastic polyimide interposed therebetween. The lower electrically insulating thin film layer 5 is enclosed at once.
　上部電気絶縁薄膜層４、下部電気絶縁薄膜層５および電気絶縁基体３は加熱によって溶融接着する性質を有し、かつ、２ＧＨｚを越えるような高周波帯域での誘電率および誘電正接が小さい材料であることが好ましく、このような材料としては、液晶ポリマーやポリテトラフルオロエチレンをあげることができる。 The upper electrically insulating thin film layer 4, the lower electrically insulating thin film layer 5 and the electrically insulating substrate 3 have a property of being melt-bonded by heating, and are materials having a low dielectric constant and dielectric loss tangent in a high frequency band exceeding 2 GHz. Preferably, examples of such a material include liquid crystal polymer and polytetrafluoroethylene.
　液晶ポリマーは、溶融時に光学的異方性を示す熱可塑性樹脂であり、具体的には、全芳香族系もしくは半芳香族系のポリエステル、ポリエステルイミド、ポリエステルアミド、あるいはこれらを含有する樹脂組成物があげられ、なかでも（Ａ）液晶ポリエステルを連続相とし（Ｂ）液晶ポリエステルと反応性を有する官能基を有する共重合体を分散相とする液晶ポリエステル樹脂組成物が好ましい。 The liquid crystal polymer is a thermoplastic resin that exhibits optical anisotropy when melted. Specifically, it is a fully aromatic or semi-aromatic polyester, polyesterimide, polyesteramide, or a resin composition containing these. Among them, a liquid crystal polyester resin composition having (A) a liquid crystal polyester as a continuous phase and (B) a copolymer having a functional group having reactivity with the liquid crystal polyester as a dispersed phase is preferable.
　本実施例では、保護遮蔽層８の金属層６を介して接地が行われるので、信号導体１、２が積層される電気絶縁基体３上に接地導体を設けて接地を行う必要がなくなる。従って、従来必要であった接地のための接地導体と保護遮蔽層８の金属層６との電気的接続作業がなくなり作業性が改善する。また、このような接地のための電気的接続作業を行っていたとき発生した電気的接続不良による高周波特性の不安定さがなくなり、品質を向上させることができる。 In the present embodiment, since the grounding is performed through the metal layer 6 of the protective shielding layer 8, it is not necessary to provide the grounding conductor on the electrically insulating base 3 on which the signal conductors 1 and 2 are laminated. Therefore, the electrical connection work between the grounding conductor for grounding and the metal layer 6 of the protective shielding layer 8 which is conventionally required is eliminated, and the workability is improved. In addition, the instability of the high frequency characteristics due to the poor electrical connection that occurs during such electrical connection work for grounding is eliminated, and the quality can be improved.
　次に、本実施例の信号伝送用フラットケーブルの製造方法を図２に基づいて説明する。電気絶縁基体３の上面に銅箔Ｃを積層し（図２（ａ））、銅箔Ｃをエッチングすることにより信号導体１、２を形成する（図２（ｂ））。 Next, a method for manufacturing a flat cable for signal transmission according to this embodiment will be described with reference to FIG. A copper foil C is laminated on the upper surface of the electrically insulating base 3 (FIG. 2A), and the signal conductors 1 and 2 are formed by etching the copper foil C (FIG. 2B).
　次に、信号導体１、２の上部に上部電気絶縁薄膜層４を積層すると共に、電気絶縁基体３の下部に下部電気絶縁薄膜層５を設け（図２（ｃ））、図２（ｄ）に示すように、上部電気絶縁薄膜層４および下部電気絶縁薄膜層５の外周に保護遮蔽層８を被覆形成し、保護遮蔽層８の上下方向から加熱加圧（ホットプレス）を施すことにより、上部電気絶縁薄膜層４および下部電気絶縁薄膜層５が軟化溶融されて金属層６と接着されて、図１に示すような信号伝送用フラットケーブル１００が作製される。 Next, the upper electric insulating thin film layer 4 is laminated on the signal conductors 1 and 2 and the lower electric insulating thin film layer 5 is provided below the electric insulating substrate 3 (FIG. 2 (c)), FIG. 2 (d). As shown in FIG. 4, by covering the outer periphery of the upper electrical insulating thin film layer 4 and the lower electrical insulating thin film layer 5 with a protective shielding layer 8 and applying heat and pressure (hot pressing) from above and below the protective shielding layer 8, The upper electric insulating thin film layer 4 and the lower electric insulating thin film layer 5 are softened and melted and bonded to the metal layer 6 to produce a signal transmission flat cable 100 as shown in FIG.
　図３は、単芯同軸ケーブルとして構成された信号伝送用フラットケーブル２００を示す。電気絶縁基体３上に、信号導体１０が一つ幅方向Ｗのほぼ中央に設けられることを除き、実施例１の信号伝送用フラットケーブル２００と同様の構成である。また、信号伝送用フラットケーブル２００は、図２に示す方法で、実施例１と同様に製造することができる。 FIG. 3 shows a signal transmission flat cable 200 configured as a single-core coaxial cable. The configuration is the same as that of the signal transmission flat cable 200 according to the first embodiment, except that one signal conductor 10 is provided on the electrical insulating base 3 at substantially the center in the width direction W. The signal transmission flat cable 200 can be manufactured in the same manner as in the first embodiment by the method shown in FIG.
　この実施例２においても、電気絶縁基体３上には、接地導体は設けられておらず、信号伝送用フラットケーブル２００は保護遮蔽層８の金属層６を介してグランドとの電気的な接続が行われる。従って、実施例１と同様に、接地導体を電気絶縁基体３上に設ける必要がなくなるので、接地のための作業性が改善されるとともに、高周波特性が安定して品質を向上させることができる。 Also in the second embodiment, no ground conductor is provided on the electrically insulating base 3, and the signal transmission flat cable 200 is electrically connected to the ground via the metal layer 6 of the protective shielding layer 8. Done. Accordingly, it is not necessary to provide a ground conductor on the electrically insulating base 3 as in the first embodiment, so that workability for grounding is improved and high-frequency characteristics can be stabilized and quality can be improved.
　図４（ａ）、（ｂ）は、多芯同軸ケーブルとして構成された信号伝送用フラットケーブル３００、単芯同軸ケーブルとして構成された信号伝送用フラットケーブル４００を示す。 4A and 4B show a signal transmission flat cable 300 configured as a multi-core coaxial cable and a signal transmission flat cable 400 configured as a single-core coaxial cable.
　実施例１、２に示す実施例では、保護遮蔽層８は、両端縁部がケーブル長手方向に連続して突き合わされて突合せ部８ａを形成していたが、図４（ａ）、（ｂ）に示す実施例では、保護遮蔽層８の金属層６、電気絶縁プラスチック層７のそれぞれの一方の端縁部６ａ、７ａが電気絶縁プラスチック装置７の他方の端縁部上に重ねられる。これにより、保護遮蔽層８は、ケーブル長手方向に沿った一方の端縁部が他方の端縁部の外側に重ね合わされ、重ね合わせ部８ａ’が形成される。その他の構成は、フラットケーブル３００、フラットケーブル４００は、それぞれ実施例１、２に示すフラットケーブル１００、フラットケーブル２００と同様である。 In the examples shown in Examples 1 and 2, the protective shielding layer 8 has both end edges continuously abutted in the cable longitudinal direction to form the abutting portion 8a. FIGS. 4 (a) and 4 (b) In the embodiment shown in FIG. 1, one end edge 6 a, 7 a of each of the metal layer 6 of the protective shielding layer 8 and the electrically insulating plastic layer 7 is overlaid on the other edge of the electrically insulating plastic device 7. Thereby, in the protective shielding layer 8, one end edge portion along the cable longitudinal direction is overlapped on the outer side of the other end edge portion to form an overlapping portion 8a '. In other configurations, the flat cable 300 and the flat cable 400 are the same as the flat cable 100 and the flat cable 200 shown in the first and second embodiments, respectively.
　実施例１、２に示すように、保護遮蔽層８を突き合わせて突合せ部８ａを形成する場合、突き合わせが不十分な箇所では、保護遮蔽層８の幅方向に隙間が発生する箇所が発生する恐れがあるが、実施例３に示す例では、保護遮蔽層８の端縁部が重ね合わされるので、その幅方向に隙間が発生する恐れが少なくなり、また、ケーブルの形崩れが防止できる、という利点がある。 As shown in Examples 1 and 2, in the case where the protective shielding layer 8 is abutted to form the abutting portion 8a, a location where a gap is generated in the width direction of the protective shielding layer 8 may occur at a location where the abutting is insufficient. However, in the example shown in Example 3, since the edge portions of the protective shielding layer 8 are overlapped, there is less possibility that a gap is generated in the width direction, and the cable can be prevented from being deformed. There are advantages.
　なお、実施例１、２、３において、信号伝送用フラットケーブルが、主に携帯電話やノートパソコンのような高密度配線電子機器に使用される例を説明したが、本発明は、これに限定されず、例えば、自動車やその他の電子機器の電源供給や信号通信に用いられる複数の信号導体線を束にしたワイヤーハーネスにも適用できるものである。 In Examples 1, 2, and 3, the example in which the flat cable for signal transmission is mainly used for high-density wiring electronic devices such as mobile phones and notebook computers has been described. However, the present invention is not limited to this. For example, the present invention can also be applied to a wire harness in which a plurality of signal conductor wires used for power supply and signal communication of automobiles and other electronic devices are bundled.
　１、２、１０　信号導体
　３　電気絶縁基体
　４　上部電気絶縁薄膜層
　５　下部電気絶縁薄膜層
　６　金属層
　７　電気絶縁プラスチック層
　８　保護遮蔽層
　８ａ　突合せ部
　８ａ’　重ね合わせ部 1, 2, 10 Signal conductor 3 Electrically insulating base 4 Upper electrically insulating thin film layer 5 Lower electrically insulating thin film layer 6 Metal layer 7 Electrically insulating plastic layer 8 Protective shielding layer 8a Butt portion 8a 'Overlapping portion

Claims (4)

  1. 　ケーブル長さ方向に延びる金属薄膜からなる一つ又は複数の信号導体と、
    　前記信号導体が積層された電気絶縁基体と、
    　前記信号導体および電気絶縁基体をケーブル厚さ方向の上下から被覆する上部電気絶縁薄膜層および下部電気絶縁薄膜層と、
    　金属層と電気絶縁プラスチック層からなり、金属層が内側に、電気絶縁プラスチック層が外側に位置するように前記上部電気絶縁薄膜層および下部電気絶縁薄膜層の外周を包囲する保護遮蔽層と、を備え、
    　前記保護遮蔽層の金属層を介してグランドとの電気的な接続が行われることを特徴とする信号伝送用フラットケーブル。     One or more signal conductors made of a metal thin film extending in the cable length direction;
    An electrically insulating substrate on which the signal conductor is laminated;
    An upper electrically insulating thin film layer and a lower electrically insulating thin film layer covering the signal conductor and the electrically insulating base from above and below in the cable thickness direction;
    A protective shielding layer comprising a metal layer and an electrically insulating plastic layer, and surrounding the outer periphery of the upper electrically insulating thin film layer and the lower electrically insulating thin film layer such that the metal layer is located on the inner side and the electrically insulating plastic layer is located on the outer side. Prepared,
    A flat cable for signal transmission, wherein electrical connection with a ground is made through a metal layer of the protective shielding layer.
  2. 　前記保護遮蔽層は、ケーブル長手方向に沿った一方の端縁部と他方の端縁部が突き合わされて前記外周を包囲し、その突合せ部が信号導体上の位置から離れた位置に形成されることを特徴とする請求項１に記載の信号伝送用フラットケーブル。 The protective shielding layer is formed at a position where one end edge portion and the other end edge portion along the longitudinal direction of the cable are abutted to surround the outer periphery, and the abutting portion is separated from the position on the signal conductor. The flat cable for signal transmission according to claim 1.
  3. 　前記保護遮蔽層は、ケーブル長手方向において一方の端縁部が他方の端縁部の外側に重ね合わされて前記外周を包囲することを特徴とする請求項１に記載の信号伝送用フラットケーブル。 2. The flat cable for signal transmission according to claim 1, wherein the protective shielding layer surrounds the outer periphery with one end edge portion being overlapped with the outside of the other end edge portion in the cable longitudinal direction.
  4. 　上部電気絶縁薄膜の厚さを、電気絶縁基体の厚さと下部電気絶縁薄膜の厚さとを加えた厚さと等しくなるようにして、信号導体の上部と下部の絶縁体の厚さを等しくするようにしたことを特徴とする請求項１から３のいずれか１項に記載の信号伝送用フラットケーブル。 Make the thickness of the upper and lower insulators equal so that the thickness of the upper electrically insulating thin film is equal to the thickness of the electrically insulating substrate plus the thickness of the lower electrically insulating thin film. The flat cable for signal transmission according to any one of claims 1 to 3, wherein the flat cable is for signal transmission.
PCT/JP2015/083683 2014-12-25 2015-12-01 Signal transmission flat cable WO2016104066A1 (en)

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JP2014236174A (en) * 2013-06-05 2014-12-15 ソニー株式会社 Transmission module, shielding method, transmission cable and connector
JP5534628B1 (en) * 2013-09-19 2014-07-02 株式会社湘南合成樹脂製作所 Flat cable for signal transmission

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