JP4908667B2 - Wire processed products and manufacturing method thereof - Google Patents

Wire processed products and manufacturing method thereof Download PDF

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Publication number
JP4908667B2
JP4908667B2 JP2000115328A JP2000115328A JP4908667B2 JP 4908667 B2 JP4908667 B2 JP 4908667B2 JP 2000115328 A JP2000115328 A JP 2000115328A JP 2000115328 A JP2000115328 A JP 2000115328A JP 4908667 B2 JP4908667 B2 JP 4908667B2
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Prior art keywords
solder
conductor
wire
inner conductor
exposed
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JP2001307556A (en
Inventor
貴朗 市川
量 松井
正義 青山
正史 国井
薫 荒川
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Hitachi Cable Ltd
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Hitachi Cable Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、電線の端末加工品およびその製造方法、特に、パソコンの液晶ディスレイ、あるいは高解像度を要求される超音波診断装置のディスプレイなどの周辺配線材として使用される極細同軸ケーブルの加工品および加工品の製造方法に関するものである。
【0002】
【従来の技術】
従来、ノート型パソコン、超音波診断装置などに使用されるLCD(液晶ディスプレイ)の周辺配線材としては、主にFPC(フレキシブルプリント基板)が用いられてきた。また、近年LCDの高画質化のために、画像信号の高速化が求められるようになり、これに対応するために、FPCに代わって、極細同軸ケーブルがLCD周辺の配線材に適用されるようになった。
【0003】
一方、ノート型パソコン、携帯用パソコンの需要拡大にともなって、パソコンは、ますます、小型化、薄肉化、軽量化が求められている。
【0004】
【発明が解決しようとする課題】
しかし、極細同軸ケーブルを使用すると、FPC、PCB(プリント基板)の各種回路基板、またはコネクタ端子に接続する場合、極細同軸ケーブルの内部導体、例えば、42AWG(導体構成、7本/素線径0.03mm)サイズの極細導体と、端子を確実に、はんだ付けする必要があり、極細導体と端子の接続部の信頼性を確保するために、はんだ付け作業に多くの労力を要するという問題が残されていた。
【0005】
それ故、本発明の目的は、極細同軸ケーブルの内部導体と、各種回路基板、あるいは各種コネクタ端子とのはんだ付けが容易に行うことができる電線加工品を提供することにある。
【0006】
本発明の他の目的は、極細同軸ケーブルの内部導体を接続するのに必要とされるはんだめっきの付着量を十分に確保できる加工が容易な電線加工品の製造方法を提供することにある。
【0007】
【課題を解決するための手段】
この発明は、上記の目的を達成するため、700MPa以上の引張り強さを有する複数の素線を1.5mm以上、かつ線径比で50倍以上のピッチで撚り合わせた導体と、所定の長さの前記導体の先端を露出させて残して前記導体を被覆する絶縁体と、露出した前記導体の前記複数の素線間にはんだが充填されて施されたはんだめっきと、を有し、前記導体は、同軸ケーブルの内部導体であり、前記同軸ケーブルは、所定のピッチで平行に配置され、両面から接着テープで挟持された複数の同軸ケーブルより構成されたテープ状の同軸ケーブルであり、前記接着テープは、一端において剥離されることによって前記複数の同軸ケーブルに前記内部導体を露出させた複数の内部導体露出部とともに外部導体を露出させた複数の外部導体露出部を形成し、前記複数の外部導体露出部は、グランドバーと接続はんだによって一括して接続されていることを特徴とする電線加工品を提供する。
【0008】
また、この発明は、上記の目的を達成するため、前記はんだめっきは、純Snはんだ、Sn―Cuはんだ、Sn―Agはんだ、Sn―Ag―Cuはんだ、およびSn―Ag―Cu―Biはんだから選択された1つの鉛フリーはんだからなることを特徴とする電線加工品を提供する。
【0009】
さらに、この発明は、上記目的を達成するため、700MPa以上の引張り強さを有する複数の素線を1.5mm以上、かつ線径比で50倍以上のピッチで撚り合わせた導体を内部導体として複数の同軸ケーブルを準備し、前記複数の同軸ケーブルを所定のピッチで平行に配置し、両面から接着テープで挟持することによりテープ状の同軸ケーブルを準備し、前記テープ状同軸ケーブルの一端において、前記接着テープ、外被、外部導体、および絶縁体を段剥ぎして所定の長さの前記内部導体を露出させると共に、前記外部導体上にグランドバーを乗せて前記外部導体と前記グランドバーとを接続はんだにより一括して接続し、露出した前記内部導体をはんだ浴に浸漬して前記内部導体の前記複数の素線間にはんだを充填することではんだめっきを施すことを特徴とする電線加工品の製造方法を提供する。
【0010】
また、この発明は、上記の目的を達成するため、前記内部導体をはんだ浴に浸漬するステップは、前記内部導体を前記はんだ浴に複数回にわたって浸漬するステップを含むことを特徴とし、前記内部導体をはんだ浴に浸漬するステップは、純Snはんだ、Sn―Cuはんだ、Sn―Agはんだ、Sn―Ag―Cuはんだ、およびSn―Ag―Cu―Biはんだから選択された1つの鉛フリーはんだを有するはんだ浴に浸漬するステップを含むことを特徴とする電線加工品の製造方法を提供する。
【0011】
【発明の実施の形態】
この発明の実施の形態として、LCD(液晶ディスプレイ)などの配線材として最も多く使用されている極細同軸ケーブルの場合について説明する。
(電線加工品の実施の形態)
図1は、本発明の実施の形態による加工途上の電線加工品を示す平面説明図である。
図1において、極細同軸ケーブル6は、硬銅線からなる7本の導体素線1を撚り合わせた内部導体3を有し、その周りに、絶縁体4、外部導体5(シールド線)、および外被(図示省略)を設けて構成される。
電線加工品10は、ケーブル端末部分の外被(符号省略)、外部導体5、絶縁体4を順次段剥ぎして除去し、内部導体3を露出した極細同軸ケーブル6を、例えば、内部導体3の端末部分を揃えて11本並列させて接着テープ7により固定するとともに、絶縁体4の周上の露出された外部導体5(シールド線)は、接続はんだ8により一括して接続され、さらに並列配置されている外部導体5(シールド線)にグランドバー9を直角に乗せて、外部導体5とグランドバー9を一括して電気的に接続している。
【0012】
図2は、本発明の実施の形態による完成後の電線加工品を示す平面説明図である。
図2において、ケーブル端末部分の外被(図示省略)、外部導体5、および絶縁体4を順次段剥ぎして除去し、内部導体3、および外部導体5を、それぞれ、露出した極細同軸ケーブル6は、所定の本数、例えば、11本を並列させ、内部導体3の端末部分を揃えた状態で接着テープ7により挟持し固定されている。露出された内部導体3の硬銅線からなる7本の導体素線1の端末部分は、素線間に充填されたはんだめっき2を有する。
導体素線1の素線間にはんだめっき2を充填された撚り線からなる内部導体3を有する極細同軸ケーブル6は、絶縁体4の周上の露出された外部導体5(シールド線)が、接続はんだ8と、外部導体5(シールド線)に直角に乗せたグランドバー9により一括して電気的に接続されている。
【0013】
図2の導体素線1の素線間のはんだめっき2は、溶融はんだめっき法により施される。はんだめっきに際しては、はんだ付着量を十分に得るために、はんだめっき浴槽の中に7本の導体素線1を1回あるいは複数回浸漬して溶融はんだ付けを実施することが望まれる。7本の導体素線1に、はんだめっき2を適量付着させるには、内部導体3を構成する7本の導体素線1として、700MPa以上の引張り強さを有し、導体素線1の撚りピッチが1.5mm以上である銅線もしくは銅合金線を用いることが適切である。700MPaの引張り強さを有し、導体素線1の撚りピッチが1.5mm以上である硬銅線を用いると、内部導体3の周上の絶縁体4を除去したときに、7本の導体素線1の撚り合わせが適度にばらけて、撚り線が弛み、撚り合わせの間隙に適量の溶融はんだめっきを浸透させて、素線間にはんだを充填させ、所望のはんだめっき2を付着させることが実現される。
【0014】
図2のはんだめっき2に使用されるはんだの組成としては、純Snはんだ、Sn―Cuはんだ、Sn―Agはんだ、Sn―Ag―Cuはんだ、Sn―Ag―Cu―Biはんだから選択された1つのはんだが用いられる。鉛を使用しないこれらのはんだ組成は、環境上の影響も少ない。
【0015】
図3は、本発明の実施の形態による電線加工品の内部導体を拡大した横断面組織図である。
図3において、引張り強さ800MPa、42AWGサイズ(導体構成、7本/素線径0.03mm、撚り合わせピッチ1.5mm)の硬銅線の導体素線1は、周上の絶縁体が除去されることにより、7本の導体素線1の撚り合わせが適度にばらけて、撚りが弛み、撚り合わせの間隙に適量の溶融はんだめっき2を浸透させ、素線間にはんだが充填された撚り線からなる複数の導体素線1の内部導
体3を得ることができる。
【0016】
図4は、本発明の他の実施の形態による電線加工品の内部導体を拡大した横断面組織図である。
図4において、42AWGサイズ(導体構成、7本/素線径0.03mm、撚り合わせピッチ3.3mm)を構成する硬銅線の導体素線1は引張り強さが700MPaであり、周上の絶縁体が除去されることにより、7本の導体素線1の撚り合わせが適度にばらけて、撚りが弛み、撚り合わせの間隙に十分な量の溶融はんだめっき2を浸透させ、素線間にはんだが充填された撚り線からなる複数の導体素線1の内部導体3を得ることができる。
【0017】
【実施例】
表1は、本発明の実施例による電線加工品の内部導体と、コネクタ端子との接続部のピール強度の評価結果を示している。
(電線加工品の構成は、図1、図2に示した実施の形態の電線加工品の構成とほとんど同じにつき、以下、説明中の符号の記載は省略する。)
【0018】
(本発明の電線加工品の実施例1ないし実施例
実施例に使用された極細同軸ケーブルの内部導体は、所定の引張り強さとして、700MPa、800MPa、あるいは850MPaの引張り強さを有する直径0.03mmの錫―銅合金線(Cu―0.3Wt%Sn合金線)の撚り線からなる導体が用いられている。撚線は、所定の撚りピッチとして、1.5mm(線径比50倍)、2.5mm(線径比83倍)、あるいは3.3mm(線径比110倍)の撚りピッチを有し、それぞれ7本撚りにした内部導体に構成されている。この7本の撚り線からなる導体の周囲には、厚さ0.08mmのフツ素系樹脂(PFA)からなる絶縁体が被覆され、その上に引張強さ800MPaを有する直径0.0254mmの錫めき銅合金線(Cu―0.3Wt%Sn合金線)を横巻きした外部導体(シールド線)を有し、さらに外被(ジャケット)としてポリエステルテープを重ね巻きして設け、外径0.34mmの極細同軸ケーブルに仕上げられている。外被(ジャケット)、外部導体(シールド線)、絶縁体を順次段剥ぎして除去して、露出された7本撚りの内部導体には、素線間に充填されたはんだめっきが施こされている。また、はんだめっきは、内部導体を、はんだ浴槽の中に1回、あるいは2回浸漬して行なわれた。素線間に充填されたはんだを有する撚り線を、金めっきが施されているコネクタ端子(幅0.25mm、長さ2.5mm、厚さ0.15mm、ピッチ0.3mm)にパルスヒーター(熱板)を用いて熱圧着した。
【0019】
次に、はんだめっきが施こされた撚り線を端子面の垂直方向へ引張る引張り試験を行い、ピール強度を測定した。ピール強度評価結果は、表1の実施例の欄の通りである。
【0020】
(比較例)
表1の比較例1〜5は、比較のために作成された電線加工品である。比較例1〜4に使用された極細同軸ケーブルの内部導体は、260MPaあるいは350MPaの引張り強さを有する直径0.03mmの錫−銅合金線(Cu−0.3Wt%Sn合金線)の撚線からなる導体が用いられている。撚線は、0.5mm(線径比17倍)あるいは1.5mm(線径比33倍)の撚りピッチを有し、それぞれ7本撚りにした内部導体に構成されている。表1の比較例5は、はんだめっきを行わない硬銅線の撚り線を使用した内部導体と、コネクタ端子との接続部のピール強度の評価結果を示している。
【0021】
比較例の内部導体として、はんだめっきを行わない硬銅線の撚線を使用した。内部導体の構成としては、引張り強さ800MPa、直径0.03mmの硬銅線を、撚りピッチ2.5mm(線径比83倍)で7本撚りにした。
比較例1〜5の各々について、得られた内部導体を、金めっきが施されている端子を有するコネクタに熱圧着した。内部導体と端子の接続部の信頼性を確認するために、内部導体を端子面の垂直方向へ引張る引張り試験を行い、ピール強度を測定した。
【0022】
(実施例の評価結果)
表1に示すように、本発明の実施例1ないし実施例は、いずれも、引張特性が良好であり、ピール強度(N)の評価試験に合格していることが判る。はんだめっき後の撚り線からなる内部導体の外観および横断面組織を調査した結果、本発明がピール強度において優れているのは、はんだめっき時のはんだ付着量が、十分に確保されているためであることが判った。図3および図4は横断面組織の調査結果に基づいて作成されたものである。本発明の実施例によると、鉛フリーはんだを使用しても、従来のSn―Pbはんだと同様の効果が得られることを確認でき、鉛フリーはんだが実用上適用可能であることが判った。
【0023】
(比較例の評価結果)
一方、比較例1〜5の場合のピール強度は、いずれも、表1から明らかなように、実施例1〜6と比べて1/3以下のピール強度であり、十分なピール強度でないことが分かる。
【0024】
【表1】

Figure 0004908667
【0025】
【発明の効果】
本発明の電線加工品およびその製造方法によると、700MPa以上の引張り強さを有する複数の素線を1.5mm以上のピッチで撚り合わせた導体を使用しているため、露出したときにばらけ易く、絶縁体を剥離してはんだ浴に浸漬するとばらけた素線間にはんだが充填される。このため、内部導体と、各種回路基板、あるいは各種コネクタの端子とのはんだ付けを容易に行うことができる。
【図面の簡単な説明】
【図1】本発明の実施の形態による加工途上の電線加工品を示す平面説明図である。
【図2】本発明の実施の形態による完成後の電線加工品を示す平面説明図である。
【図3】本発明の実施の形態による電線加工品の内部導体を拡大した横断面組織図である。(撚りピッチ1.5mm)
【図4】本発明の実施の形態による電線加工品の内部導体を拡大した横断面組織図である。(撚りピッチ3.3mm)
【符号の説明】
1 導体素線
2 はんだめっき
3 内部導体
4 絶縁体
5 外部導体(シールド線)
6 極細同軸ケーブル
7 接着テープ
8 接続はんだ
9 グランドバー
10 電線加工品[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a processed product of a terminal of an electric wire and a manufacturing method thereof, in particular, a processed product of an ultrafine coaxial cable used as a peripheral wiring material such as a liquid crystal display of a personal computer or a display of an ultrasonic diagnostic apparatus requiring high resolution, and The present invention relates to a method for manufacturing a processed product.
[0002]
[Prior art]
Conventionally, an FPC (flexible printed circuit board) has been mainly used as a peripheral wiring material for LCDs (liquid crystal displays) used in notebook personal computers, ultrasonic diagnostic apparatuses, and the like. In recent years, in order to improve the image quality of LCDs, it has become necessary to increase the speed of image signals. In order to meet this demand, instead of FPC, ultra-fine coaxial cables are applied to wiring materials around LCDs. Became.
[0003]
On the other hand, with increasing demand for notebook computers and portable computers, personal computers are increasingly required to be smaller, thinner and lighter.
[0004]
[Problems to be solved by the invention]
However, when a micro coaxial cable is used, when connecting to various circuit boards of FPC, PCB (printed circuit board) or connector terminals, the inner conductor of the micro coaxial cable, for example, 42AWG (conductor configuration, 7 wires / element diameter 0) .03 mm) size fine conductors and terminals must be securely soldered, and there remains a problem that much labor is required for the soldering work to ensure the reliability of the connection between the fine conductors and the terminals. It had been.
[0005]
Therefore, an object of the present invention is to provide an electric wire processed product in which the inner conductor of the micro coaxial cable and various circuit boards or various connector terminals can be easily soldered.
[0006]
Another object of the present invention is to provide a method of manufacturing a wire processed product that can be easily processed and can sufficiently secure the amount of solder plating that is required for connecting the inner conductors of the micro coaxial cable.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a conductor obtained by twisting a plurality of strands having a tensile strength of 700 MPa or more at a pitch of 1.5 mm or more and a wire diameter ratio of 50 times or more , and a predetermined length. possess an insulator covering the conductor, leaving to expose the distal end of the said conductor, and a solder plating solder is applied is filled between said plurality of strands of the exposed the conductor, the said The conductor is an inner conductor of a coaxial cable, and the coaxial cable is a tape-shaped coaxial cable configured by a plurality of coaxial cables arranged in parallel at a predetermined pitch and sandwiched by adhesive tape from both sides, The adhesive tape has a plurality of outer conductor exposed portions in which an outer conductor is exposed together with a plurality of inner conductor exposed portions in which the inner conductor is exposed in the plurality of coaxial cables by being peeled off at one end. Form, wherein the plurality of outer conductor exposed portion provides a wire workpiece, characterized in that it is connected together by a ground bar and soldered.
[0008]
Further, the present invention is to achieve the above object, before Symbol solder plating, pure Sn solder, Sn-Cu solder, Sn-Ag solder, Sn-Ag-Cu solder, and Sn-Ag-Cu-Bi solder An electric wire processed product comprising one lead-free solder selected from the above.
[0009]
Furthermore, in order to achieve the above object, the present invention uses, as an internal conductor, a conductor obtained by twisting a plurality of strands having a tensile strength of 700 MPa or more at a pitch of 1.5 mm or more and a wire diameter ratio of 50 times or more. Preparing a plurality of coaxial cables, arranging the plurality of coaxial cables in parallel at a predetermined pitch, preparing a tape-shaped coaxial cable by sandwiching with adhesive tape from both sides, at one end of the tape-shaped coaxial cable, The adhesive tape, jacket, outer conductor, and insulator are stripped to expose the inner conductor of a predetermined length, and a ground bar is placed on the outer conductor to connect the outer conductor and the ground bar. Soldering is performed by connecting together by connecting solder, immersing the exposed inner conductor in a solder bath, and filling the plurality of strands of the inner conductor with solder. To provide a method of manufacturing a wire workpiece, characterized in that applying come.
[0010]
Further, the present invention is to achieve the above object, the step of immersing the inner conductor to the solder bath, characterized in that it comprises a step of dipping a plurality of times the inner conductor to the solder bath, before Symbol internal The step of immersing the conductor in the solder bath includes one lead-free solder selected from pure Sn solder, Sn-Cu solder, Sn-Ag solder, Sn-Ag-Cu solder, and Sn-Ag-Cu-Bi solder. There is provided a method of manufacturing an electric wire processed product comprising a step of immersing in a solder bath.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
As an embodiment of the present invention, a case of an ultrafine coaxial cable that is most frequently used as a wiring material such as an LCD (liquid crystal display) will be described.
(Embodiment of electric wire processed product)
FIG. 1 is an explanatory plan view showing a processed wire product in the middle of processing according to an embodiment of the present invention.
In FIG. 1, a micro coaxial cable 6 has an inner conductor 3 in which seven conductor strands 1 made of hard copper wire are twisted, and an insulator 4, an outer conductor 5 (shield wire), and A jacket (not shown) is provided.
The processed wire product 10 is obtained by removing the outer sheath (reference number omitted) of the cable end portion, the outer conductor 5, and the insulator 4 by sequentially stripping and exposing the micro coaxial cable 6 exposing the inner conductor 3, for example, the inner conductor 3 11 are arranged in parallel and fixed by the adhesive tape 7, and the exposed outer conductor 5 (shield wire) on the periphery of the insulator 4 is collectively connected by the connection solder 8, and further in parallel. A ground bar 9 is placed at a right angle on the arranged outer conductor 5 (shield wire), and the outer conductor 5 and the ground bar 9 are collectively electrically connected.
[0012]
FIG. 2 is an explanatory plan view showing the finished wire processed product according to the embodiment of the present invention.
In FIG. 2, the jacket (not shown) of the cable terminal portion, the outer conductor 5 and the insulator 4 are sequentially stripped and removed, and the inner conductor 3 and the outer conductor 5 are respectively exposed to the exposed micro coaxial cable 6 Are fixed by being sandwiched by the adhesive tape 7 in a state where a predetermined number, for example, 11 wires are arranged in parallel and the end portions of the internal conductors 3 are aligned. The terminal portions of the seven conductor strands 1 made of hard copper wires of the exposed inner conductor 3 have solder plating 2 filled between the strands.
The micro coaxial cable 6 having the inner conductor 3 made of a stranded wire filled with solder plating 2 between the conductor wires 1 has an exposed outer conductor 5 (shield wire) on the periphery of the insulator 4. The connection solder 8 and the ground bar 9 placed at a right angle on the outer conductor 5 (shield wire) are electrically connected together.
[0013]
Solder plating 2 between the strands of the conductor strand 1 in FIG. 2 is performed by a molten solder plating method. At the time of solder plating, in order to obtain a sufficient amount of solder adhesion, it is desirable to perform melt soldering by immersing the seven conductor strands 1 in the solder plating bath one or more times. 7 conductors wire 1, the solder plating 2 to be an appropriate amount deposited as a conductor wire 1 of seven constituting the inner conductor 3, have a tensile strength of more than 700 MPa, the conductor wire 1 it is appropriate that the twisting pitch is a copper wire or copper alloy wire Ru der least 1.5 mm. Have a tensile strength of 700 MPa, the twist pitch of the conductive wire 1 is used hard copper Ru der least 1.5 mm, when the removal of the insulator 4 on the circumference of the inner conductor 3, seven The twisting of the conductor wire 1 is moderately spread, the twisted wire is loosened, a suitable amount of molten solder plating is infiltrated into the gap of the twisting, the solder is filled between the wires, and the desired solder plating 2 is obtained. Adhering is realized.
[0014]
The solder composition used for the solder plating 2 in FIG. 2 is selected from pure Sn solder, Sn—Cu solder, Sn—Ag solder, Sn—Ag—Cu solder, and Sn—Ag—Cu—Bi solder. Two solders are used. These solder compositions that do not use lead have little environmental impact.
[0015]
FIG. 3 is an enlarged cross-sectional structure diagram of the inner conductor of the electric wire processed product according to the embodiment of the present invention.
In FIG. 3, the conductor element wire 1 of a hard copper wire having a tensile strength of 800 MPa and a 42 AWG size (conductor configuration, 7 wires / element wire diameter 0.03 mm, twisting pitch 1.5 mm) is removed from the insulator on the circumference. As a result, the twisting of the seven conductor wires 1 is moderately spread, the twist is loosened, and an appropriate amount of molten solder plating 2 is infiltrated into the space between the twists, and the solder is filled between the wires. It is possible to obtain the inner conductor 3 of the plurality of conductor wires 1 made of stranded wires.
[0016]
FIG. 4 is an enlarged cross-sectional structure diagram of an inner conductor of a processed wire product according to another embodiment of the present invention.
In FIG. 4, the conductor wire 1 of the hard copper wire constituting the 42 AWG size (conductor configuration, 7 wires / element wire diameter 0.03 mm, twist pitch 3.3 mm) has a tensile strength of 700 MPa, By removing the insulator, the twisting of the seven conductor wires 1 is appropriately dispersed, the twist is loosened, and a sufficient amount of the molten solder plating 2 is infiltrated into the gap between the twisted wires. It is possible to obtain the inner conductors 3 of the plurality of conductor strands 1 made of stranded wires filled with solder.
[0017]
【Example】
Table 1 shows the evaluation results of the peel strength of the connection portion between the inner conductor of the processed wire product and the connector terminal according to the embodiment of the present invention.
(The configuration of the electric wire processed product is almost the same as the configuration of the electric wire processed product of the embodiment shown in FIGS. 1 and 2, and the description of the reference numerals in the description is omitted below.)
[0018]
(Embodiment 1 to Embodiment 6 of the electric wire processed product of the present invention)
The inner conductor of the micro-coaxial cables used in the examples, as a predetermined tensile strength, 7 MPa, 800 MPa or 850MPa of tensile strength tin diameter 0.03mm with, - copper alloy wire (Cu-0.3 wt % Sn alloy wire) is used. The stranded wire has a predetermined twist pitch of 1 . It has a twist pitch of 5 mm (50 times the wire diameter ratio), 2.5 mm (83 times the wire diameter ratio), or 3.3 mm (110 times the wire diameter ratio), and is composed of seven inner conductors. Yes. The conductor made of seven stranded wires is coated with an insulator made of fluorine-based resin (PFA) having a thickness of 0.08 mm, and a tin having a tensile strength of 800 MPa and a diameter of 0.0254 mm. copper alloy wire Ki Tsu because the (Cu-0.3 wt% Sn alloy wire) has a lateral winding with external conductor (shield line), provided wound further superposed polyester tape outside as an object (jacket), the outer diameter 0 Finished with a 34 mm ultra-fine coaxial cable. The outer jacket (jacket), outer conductor (shield wire), and insulator are sequentially stripped and removed, and the exposed seven-stranded inner conductor is subjected to solder plating filled between the strands. ing. Solder plating was performed by immersing the inner conductor once or twice in the solder bath. A stranded wire having solder filled between the strands is applied to a connector terminal (width 0.25 mm, length 2.5 mm, thickness 0.15 mm, pitch 0.3 mm) plated with gold (pulse heater). Thermocompression bonding was performed using a hot plate.
[0019]
Next, a tensile test was performed by pulling the stranded wire plated with solder in the direction perpendicular to the terminal surface, and the peel strength was measured. The peel strength evaluation results are as shown in the column of Examples in Table 1.
[0020]
(Comparative example)
Comparative Example 1-5 in Table 1, Ru wire workpiece der created for comparison. The inner conductor of the micro coaxial cable used in Comparative Examples 1 to 4 is a twisted wire of a 0.03 mm diameter tin-copper alloy wire (Cu-0.3 Wt% Sn alloy wire) having a tensile strength of 260 MPa or 350 MPa. The conductor which consists of is used. The stranded wires have a twist pitch of 0.5 mm (17 times the wire diameter ratio) or 1.5 mm (33 times the wire diameter ratio), and are each composed of seven twisted inner conductors. Comparative Example 5 in Table 1 shows the evaluation result of the peel strength of the connection portion between the internal conductor using a hard copper stranded wire not subjected to solder plating and the connector terminal.
[0021]
As an internal conductor of Comparative Example 5 , a stranded wire of hard copper wire not subjected to solder plating was used. As a configuration of the inner conductor, a hard copper wire having a tensile strength of 800 MPa and a diameter of 0.03 mm was twisted at a twist pitch of 2.5 mm (wire diameter ratio: 83 times).
About each of Comparative Examples 1-5, the obtained internal conductor was thermocompression-bonded to the connector which has the terminal in which the gold plating was given. In order to confirm the reliability of the connection portion between the inner conductor and the terminal, a tensile test was performed by pulling the inner conductor in the direction perpendicular to the terminal surface, and the peel strength was measured.
[0022]
(Evaluation results of examples)
As shown in Table 1, it can be seen that Examples 1 to 6 of the present invention all have good tensile properties and pass the peel strength (N) evaluation test. As a result of investigating the appearance and cross-sectional structure of the inner conductor composed of stranded wires after solder plating, the reason why the present invention is excellent in peel strength is that the solder adhesion amount during solder plating is sufficiently secured. It turns out that there is. FIG. 3 and FIG. 4 are created based on the examination result of the cross-sectional structure. According to the examples of the present invention, it was confirmed that even when lead-free solder was used, the same effect as that of the conventional Sn—Pb solder was obtained, and it was found that lead-free solder is practically applicable.
[0023]
(Evaluation result of comparative example)
On the other hand, the peel strength in Comparative Example 1-5, both, as is clear from Table 1, a peel strength of less than 1/3 as compared with Examples 1 to 6, it may not be sufficient peel strength I understand.
[0024]
[Table 1]
Figure 0004908667
[0025]
【Effect of the invention】
According to the electric wire processed product of the present invention and the manufacturing method thereof, since a conductor in which a plurality of strands having a tensile strength of 700 MPa or more are twisted at a pitch of 1.5 mm or more is used, it is scattered when exposed. rather easily, the solder is filled between the loose was strands When you peel the insulation is immersed in a solder bath. For this reason, it is possible to easily perform soldering between the inner conductor and various circuit boards or various connector terminals.
[Brief description of the drawings]
FIG. 1 is an explanatory plan view showing an electric wire processed product in the process of processing according to an embodiment of the present invention.
FIG. 2 is an explanatory plan view showing an electric wire processed product after completion according to the embodiment of the present invention.
FIG. 3 is an enlarged cross-sectional structure diagram of an inner conductor of a processed wire product according to an embodiment of the present invention. (Twist pitch 1.5mm)
FIG. 4 is an enlarged cross-sectional structure diagram of an inner conductor of a processed wire product according to an embodiment of the present invention. (Twist pitch 3.3mm)
[Explanation of symbols]
1 Conductor Wire 2 Solder Plating 3 Inner Conductor 4 Insulator 5 Outer Conductor (Shield Wire)
6 Micro coaxial cable 7 Adhesive tape 8 Connection solder 9 Ground bar 10 Electric wire processed product

Claims (5)

700MPa以上の引張り強さを有する複数の素線を1.5mm以上、かつ線径比で50倍以上のピッチで撚り合わせた導体と、所定の長さの前記導体の先端を露出させて残して前記導体を被覆する絶縁体と、露出した前記導体の前記複数の素線間にはんだが充填されて施されたはんだめっきと、を有し、前記導体は、同軸ケーブルの内部導体であり、前記同軸ケーブルは、所定のピッチで平行に配置され、両面から接着テープで挟持された複数の同軸ケーブルより構成されたテープ状の同軸ケーブルであり、前記接着テープは、一端において剥離されることによって前記複数の同軸ケーブルに前記内部導体を露出させた複数の内部導体露出部とともに外部導体を露出させた複数の外部導体露出部を形成し、前記複数の外部導体露出部は、グランドバーと接続はんだによって一括して接続されていることを特徴とする電線加工品。A conductor in which a plurality of strands having a tensile strength of 700 MPa or more are twisted at a pitch of 1.5 mm or more and a wire diameter ratio of 50 times or more and the tip of the conductor having a predetermined length are left exposed. an insulator covering the conductor, have a, and solder plating solder is applied is filled between said plurality of strands of the exposed the conductor, the conductor is an inner conductor of a coaxial cable, wherein The coaxial cable is a tape-shaped coaxial cable that is arranged in parallel at a predetermined pitch and is composed of a plurality of coaxial cables that are sandwiched by adhesive tape from both sides. A plurality of outer conductor exposed portions in which the outer conductor is exposed together with a plurality of inner conductor exposed portions in which the inner conductor is exposed in a plurality of coaxial cables are formed. Wire workpiece, characterized in that it is connected together by Ndoba and soldered. 前記はんだめっきは、純Snはんだ、Sn―Cuはんだ、Sn―Agはんだ、Sn―Ag―Cuはんだ、およびSn―Ag―Cu―Biはんだから選択された1つの鉛フリーはんだからなることを特徴とする請求項記載の電線加工品。The solder plating is composed of one lead-free solder selected from pure Sn solder, Sn—Cu solder, Sn—Ag solder, Sn—Ag—Cu solder, and Sn—Ag—Cu—Bi solder. The processed wire product according to claim 1 . 700MPa以上の引張り強さを有する複数の素線を1.5mm以上、かつ線径比で50倍以上のピッチで撚り合わせた導体を内部導体として複数の同軸ケーブルを準備し、前記複数の同軸ケーブルを所定のピッチで平行に配置し、両面から接着テープで挟持することによりテープ状の同軸ケーブルを準備し、前記テープ状同軸ケーブルの一端において、前記接着テープ、外被、外部導体、および絶縁体を段剥ぎして所定の長さの前記内部導体を露出させると共に、前記外部導体上にグランドバーを乗せて前記外部導体と前記グランドバーとを接続はんだにより一括して接続し、露出した前記内部導体をはんだ浴に浸漬して前記内部導体の前記複数の素線間にはんだを充填することではんだめっきを施すことを特徴とする電線加工品の製造方法。Preparing a plurality of coaxial cables by using a conductor obtained by twisting a plurality of strands having a tensile strength of 700 MPa or more at a pitch of 1.5 mm or more and a wire diameter ratio of 50 times or more as an internal conductor; Are arranged in parallel at a predetermined pitch and are sandwiched with adhesive tape from both sides to prepare a tape-shaped coaxial cable. At one end of the tape-shaped coaxial cable, the adhesive tape, the jacket, the outer conductor, and the insulator The inner conductor of a predetermined length is exposed by stepping off, and a ground bar is placed on the outer conductor, and the outer conductor and the ground bar are connected together by connecting solder, and the exposed inner conductor is exposed. A method of manufacturing an electric wire processed product characterized by performing solder plating by immersing a conductor in a solder bath and filling solder between the plurality of strands of the inner conductor . 前記内部導体をはんだ浴に浸漬するステップは、前記内部導体を前記はんだ浴に複数回にわたって浸漬するステップを含むことを特徴とする請求項記載の電線加工品の製造方法。The method of manufacturing an electric wire processed product according to claim 3 , wherein the step of immersing the inner conductor in the solder bath includes a step of immersing the inner conductor in the solder bath a plurality of times. 前記内部導体をはんだ浴に浸漬するステップは、純Snはんだ、Sn―Cuはんだ、Sn―Agはんだ、Sn―Ag―Cuはんだ、およびSn―Ag―Cu―Biはんだから選択された1つの鉛フリーはんだを有するはんだ浴に浸漬するステップを含むことを特徴とする請求項記載の電線加工品の製造方法。The step of immersing the inner conductor in the solder bath is one lead-free selected from pure Sn solder, Sn-Cu solder, Sn-Ag solder, Sn-Ag-Cu solder, and Sn-Ag-Cu-Bi solder 5. The method of manufacturing an electric wire processed product according to claim 4 , further comprising a step of immersing in a solder bath having solder.
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