JP3964832B2 - Differential signal transmission harness - Google Patents
Differential signal transmission harness Download PDFInfo
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- JP3964832B2 JP3964832B2 JP2003186031A JP2003186031A JP3964832B2 JP 3964832 B2 JP3964832 B2 JP 3964832B2 JP 2003186031 A JP2003186031 A JP 2003186031A JP 2003186031 A JP2003186031 A JP 2003186031A JP 3964832 B2 JP3964832 B2 JP 3964832B2
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- Prior art keywords
- differential signal
- signal
- harness
- cable
- twist
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- Expired - Fee Related
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- 230000008054 signal transmission Effects 0.000 title claims description 17
- 239000004020 conductor Substances 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 239000012212 insulator Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Description
【０００１】
【発明の属する技術分野】
本発明は、差動信号伝送用ハーネス、特に高周波差動信号を伝送するのに有用なハーネスに関する。
【０００２】
【従来の技術】
近年、パソコン等の電子機器の高速化と相俟って採用する信号の伝送速度も高速化し併せて、使用する信号の種類も増加してきている。このような要求に応えるため、２本の信号ケーブルと１本のドレイン線との３本ツイスト撚り構造体の外周をアルミテープ等の金属テープで一括被覆してなる差動信号伝送用ケーブルを配したハーネスが知られている（特開２００２−３０４９２１号公報）。
しかしながら、このハーネスでは、金属テープによる一括被覆に因るためか、信号波形に“なまり”が発生し、特に高周波差動信号に対する伝送特性が未だ充分ではない。同時に、金属テープによる被覆のため、ケーブル全体として可撓性もなく、ハーネスへの取付時に支障をきたしていた。
【０００３】
【発明が解決しようとする課題】
したがって、本発明の課題は、上記の問題点を解消することにより、高周波差動信号に対する伝送特性に優れるとともに取扱性の改善された差動信号伝送用ハーネスを提供することにある。
【０００４】
【課題を解決するための手段】
本発明者等は、高周波差動信号を伝送する信号ケーブルとして、同一外径のケーブルの３本ツイスト撚り構造体を採用するとき、従来の一括被覆を不要とし、“なまり”と取扱性の問題を容易に解消できることを究明した。
かくして、本発明によれば、導体を絶縁体で被覆してなる信号ケーブルの複数本と各信号ケーブルの両端末部の導体を固着するための端子部を含むハーネスにおいて、該複数本の信号ケーブルの少なくとも一部に、同一外径の信号ケーブルの３本ツイスト撚り構造体が金属テープにより一括被覆されることなく、高周波差動信号の伝送用として配されていることを特徴とする差動信号伝送用ハーネスが提供される。
【０００５】
【発明の実施の形態】
以下、本発明を、独立した３本の信号ケーブル（単線）と、同一外径の信号ケーブルの３本ツイスト撚り構造体２組とを併用した差動信号伝送用ハーネスについて、添付図面を参照しながら説明する。
図１は、本発明にしたがって、同一外径の信号ケーブルの３本ツイスト撚り構造体を配した差動信号伝送用ハーネスの一例を示す平面図である。
図２は、上記同一外径の信号用ケーブルの３本ツイスト撚り構造体の横断面図である。
図１〜図２において、（１）は導体（１ａ）と絶縁体（１ｂ）とからなる信号ケーブル、（２）は高周波差動信号を伝送するための、同一外径の３本の信号ケーブル（１）からなる３本ツイスト撚り構造体、そして（３）は各ケーブルの両端末部の導体が接続された端子部である。
【０００６】
本発明で特徴的なことは、複数の独立した信号ケーブルの内、差動信号、特に高周波差動信号を伝送するケーブル部分に、同一外径の信号ケーブルの３本ツイスト撚り構造体（図では２組）を金属テープにより一括被覆することなく配したことに在る。こうすることにより、高周波差動信号がひずむことなく伝送され且つ、ケーブル全体としても撚り構造による可撓性が確保され、取扱性が格段に改善される。
ここで、差動信号用ケーブルとしては、一般にはツイスト撚り、横巻き、さらには編組等が知られているが、本発明においては高周波伝送特性と可撓性とを両立させるため、同一外径の信号ケーブルの３本ツイスト撚り構造体を採用することが不可欠である。その際、撚りピッチが３ｍｍ〜２０ｍｍの範囲にあるとき、上記の二つの特性がバランス良く両立する。
【０００７】
この同一外径の信号ケーブルの３本ツイスト撚り構造体（２）により、高周波差動信号を伝送する際には、そのうちの任意の２本を高周波差動信号伝送用とし、残り１本をドレイン線として割り当てればよい。また、複数の高周波差動信号を伝送する場合には、伝送する高周波差動信号の数に応じて、同一外径の信号ケーブルの３本ツイスト撚り構造体（２）を複数組配置すればよい。これら複数組の配置についても特段の制約は無く、自由に配置可能である。
本発明によれば、信号ケーブル（１）の導体（１ａ）の外径が特に０．０９ｍｍ〜０．５mmという極細径であるとき、前記の３ｍｍ〜２０mmの撚りピッチの効果と相俟って、伝送特性並びに可撓性がより改善される。しかもこの効果は、同一外径の極細同軸ケーブルの３本ツイスト撚り構造体（２）において、理想的にバランスすることも確認された。ここで、前記の導体（１ａ）を被覆する絶縁体（１ｂ）については格別の制約はなく、斯界で採用されているフッ素樹脂、ポリエチレン、さらにはポリスチレン等が採用される。
以上は、通常の２つの位相からなる２値差動信号を伝送するハーネスの例であるが、本発明のハーネスは３つ以上の位相からなる多値差動信号に対しても展開できることは言うまでもない。この場合、本発明の差動信号伝送用ハーネスは、１０ Ｍ Ｈｚ〜 ２０００Ｍ Ｈｚの範囲の高周波差動信号に対して有効に機能する。
さらに、本発明の差動信号伝送用ハーネスは、信号形態に応じて、ツインパラレル方式やトリプル方式等周知の信号ケーブルを混在させた複合形態としてもよい。
【０００８】
以下に、本発明の差動信号伝送用ハーネスの一実施例を図１〜図２の場合について示す。
先ず、素線径が１０２μｍの錫めっき軟銅線の７本を同芯撚りした直径が０．３０５ｍｍの極細導体（１ａ）の周りに、絶縁体（１ｂ）としてフッ素樹脂（ＦＥＰ）を被覆して、外径０．４ｍｍ、長さ２４０ｍｍの信号ケーブル（１）を９本用意した。次に、これらケーブルの内、６本の信号ケーブル（１）を使用して、２種類の高周波差動信号を伝送するための、３本ツイスト撚り構造体（２）を２組用意した。その際、撚りピッチは１０．６ｍｍとした。最後に、残りの３本の信号ケーブル（１）、および２組の３本ツイスト撚りケーブル（２）の両端末の導体を１．５ｍｍ露出させ、挿入治具で各導体部を９極のナイロン製の圧入端子からなる端子部（３）に挿入して、本発明の差動信号伝送用ハーネスを完成した。
このハーネスに２８０ＭＨｚの高周波差動信号を印加して信号伝送特性の目安となる、アイパターン特性等を測定した。その結果、信号波形の“なまり”はほとんど発生せず、しかも、信号の分離が明確な、優れたアイパターン特性が得られた。
【０００９】
【発明の効果】
本発明の差動信号用ハーネスでは、特に高周波差動信号を伝送するケーブル部分を、同一外径の信号ケーブルの３本ツイスト撚り構成にすることで、優れたアイパターン特性が得られ、したがって高周波伝送特性が改善される。同時に、この３本ツイスト撚り構造体は撚り構造で形態が保持されるので、従来の金属テープによる一括被覆では得られなかった可撓性が実現され、ハーネス組立時の作業性も格段に改善される。
【図面の簡単な説明】
【図１】本発明にしたがって、同一外径の信号ケーブルの３本ツイスト撚り構造体を含む差動信号伝送用ハーネスの一例を示す平面図である。
【図２】上記同一外径の信号ケーブルの３本ツイスト撚り構造体の横断面図である。
【符号の説明】
１ 信号ケーブル（単線）
１ａ 導体
１ｂ 絶縁体
２ 同一外径の信号ケーブルの３本ツイスト撚り構造体
３ 端子部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a differential signal transmission harness, and more particularly to a harness useful for transmitting a high-frequency differential signal.
[0002]
[Prior art]
In recent years, the transmission speed of signals adopted in conjunction with the speeding up of electronic devices such as personal computers has been increased, and the types of signals used have increased. In order to meet these requirements, a differential signal transmission cable is provided in which the outer periphery of a three twisted twisted structure of two signal cables and one drain wire is collectively covered with a metal tape such as aluminum tape. A known harness is known (Japanese Patent Laid-Open No. 2002-304921).
However, in this harness, the signal waveform is “rounded” because of the collective covering with the metal tape, and the transmission characteristics for high-frequency differential signals are not yet sufficient. At the same time, due to the covering with the metal tape, the entire cable is not flexible, which causes trouble when attached to the harness.
[0003]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a differential signal transmission harness that is excellent in transmission characteristics for high-frequency differential signals and improved in handleability by eliminating the above problems.
[0004]
[Means for Solving the Problems]
When adopting a three twist twist structure of a cable having the same outer diameter as a signal cable for transmitting a high-frequency differential signal, the present inventors do not need a conventional lump-sum coating, and have a problem of “margin” and handleability. It has been found that can be easily resolved.
Thus, according to the present invention, in a harness including a plurality of signal cables formed by covering a conductor with an insulator and terminal portions for fixing conductors at both end portions of each signal cable, the plurality of signal cables A differential signal characterized in that at least a part of the three twisted structures of signal cables having the same outer diameter are arranged for transmission of a high-frequency differential signal without being collectively covered with a metal tape. A transmission harness is provided.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the differential signal transmission harness using the present invention in combination with three independent signal cables (single wires) and two sets of three twisted twisted structures of signal cables having the same outer diameter will be described with reference to the accompanying drawings. While explaining.
FIG. 1 is a plan view showing an example of a differential signal transmission harness in which three twisted twist structures of signal cables having the same outer diameter are arranged according to the present invention.
Figure 2 is a cross-sectional view of three twisted twist structure of a signal cable of the same outer diameter.
1-2, (1) is a signal cable composed of a conductor (1a) and an insulator (1b), and (2) is three signal cables having the same outer diameter for transmitting a high-frequency differential signal. The three twist twist structure which consists of (1), and (3) are the terminal parts to which the conductor of the both terminal parts of each cable was connected.
[0006]
A characteristic feature of the present invention is that, among a plurality of independent signal cables, a cable portion for transmitting differential signals, particularly high-frequency differential signals, has three twisted twisted structures of signal cables having the same outer diameter (in the figure, 2 sets) are arranged without being collectively covered with metal tape . By doing so, the high-frequency differential signal can be transmitted without distortion, and the flexibility of the twisted structure can be ensured for the entire cable, and the handleability can be greatly improved.
Here, as the differential signal cable, twist twist, horizontal winding, and further braiding are generally known. However, in the present invention, in order to achieve both high-frequency transmission characteristics and flexibility, the same outer diameter is used. it is essential to adopt a three twisted twisted structure of the signal cable. At that time, when the twist pitch is in the range of 3 mm to 20 mm, the above two characteristics are balanced.
[0007]
When transmitting a high-frequency differential signal with this three twisted twisted structure (2) of signal cables of the same outer diameter, any two of them are used for high-frequency differential signal transmission, and the remaining one is a drain. Assign as a line. Further, when transmitting a plurality of high-frequency differential signals, a plurality of sets of three twisted twisted structures (2) of signal cables having the same outer diameter may be arranged in accordance with the number of high-frequency differential signals to be transmitted. . There are no particular restrictions on the arrangement of the plurality of sets , and they can be arranged freely.
According to the present invention, when the outer diameter of the conductor (1a) of the signal cable (1) is particularly an extremely small diameter of 0.09 mm to 0.5 mm, combined with the effect of the twist pitch of 3 mm to 20 mm. Further, transmission characteristics as well as flexibility are improved. Moreover, this effect is three twisted twisted structure micro-coaxial cables of the same outer diameter in (2) was also confirmed ideally be balanced. Here, there is no particular restriction on the insulator (1b) covering the conductor (1a), and fluororesin, polyethylene, polystyrene, etc. adopted in this field are employed.
The above is an example of a harness that transmits a normal binary differential signal composed of two phases, but it goes without saying that the harness of the present invention can also be developed for a multi-value differential signal composed of three or more phases. Yes. In this case, the differential signal transmission harness of the present invention functions effectively for high-frequency differential signals in the range of 10 MHz to 2000 MHz.
Furthermore, the differential signal transmission harness of the present invention may have a composite form in which known signal cables such as a twin parallel system and a triple system are mixed according to the signal form.
[0008]
An embodiment of the differential signal transmission harness according to the present invention will be described below with reference to FIGS.
First, a fluororesin (FEP) is coated as an insulator (1b) around an ultrafine conductor (1a) having a diameter of 0.305 mm obtained by concentrically twisting seven tin-plated annealed copper wires having a wire diameter of 102 μm. Nine signal cables (1) having an outer diameter of 0.4 mm and a length of 240 mm were prepared. Next, two sets of three twist twisted structures (2) for transmitting two types of high-frequency differential signals were prepared using six signal cables (1) among these cables. At that time, the twist pitch was 10.6 mm. Finally, the conductors at both ends of the remaining three signal cables (1) and two sets of three twisted twisted cables (2) are exposed 1.5 mm, and each conductor is made of 9-pole nylon with an insertion jig. The differential signal transmission harness of the present invention was completed by inserting it into the terminal portion (3) made of a press-fit terminal made of the product.
A high frequency differential signal of 280 MHz was applied to this harness to measure eye pattern characteristics and the like, which serve as a standard for signal transmission characteristics. As a result, the signal waveform “rounded” hardly occurred, and excellent eye pattern characteristics with clear signal separation were obtained.
[0009]
【The invention's effect】
In the differential signal harness according to the present invention, an excellent eye pattern characteristic can be obtained by making the cable portion for transmitting a high-frequency differential signal in particular a three-twist twisted configuration of a signal cable having the same outer diameter. Transmission characteristics are improved. At the same time, since the three twisted twisted structure is maintained in a twisted structure, flexibility that cannot be obtained by batch coating with a conventional metal tape is realized, and workability at the time of harness assembly is also greatly improved. The
[Brief description of the drawings]
FIG. 1 is a plan view showing an example of a differential signal transmission harness including a three twist twist structure of signal cables having the same outer diameter according to the present invention.
FIG. 2 is a cross-sectional view of the three twist twist structure of the signal cable having the same outer diameter .
[Explanation of symbols]
1 Signal cable (single wire)
DESCRIPTION OF
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003186031A JP3964832B2 (en) | 2003-06-30 | 2003-06-30 | Differential signal transmission harness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003186031A JP3964832B2 (en) | 2003-06-30 | 2003-06-30 | Differential signal transmission harness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2005019345A JP2005019345A (en) | 2005-01-20 |
| JP3964832B2 true JP3964832B2 (en) | 2007-08-22 |
Family
ID=34185277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003186031A Expired - Fee Related JP3964832B2 (en) | 2003-06-30 | 2003-06-30 | Differential signal transmission harness |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3964832B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007280666A (en) * | 2006-04-04 | 2007-10-25 | Nissei Electric Co Ltd | Harness for high-speed signal transmission |
| JP2009021978A (en) * | 2007-06-11 | 2009-01-29 | Panasonic Corp | Transmission cable |
| JP2009033710A (en) * | 2007-06-28 | 2009-02-12 | Panasonic Corp | Differential transmission line connector |
-
2003
- 2003-06-30 JP JP2003186031A patent/JP3964832B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005019345A (en) | 2005-01-20 |
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