JP2005019345A - Harness for differential signal transmission - Google Patents
Harness for differential signal transmission Download PDFInfo
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- JP2005019345A JP2005019345A JP2003186031A JP2003186031A JP2005019345A JP 2005019345 A JP2005019345 A JP 2005019345A JP 2003186031 A JP2003186031 A JP 2003186031A JP 2003186031 A JP2003186031 A JP 2003186031A JP 2005019345 A JP2005019345 A JP 2005019345A
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- Prior art keywords
- harness
- differential signal
- twisted
- signal
- cable
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 230000008054 signal transmission Effects 0.000 title claims abstract description 19
- 239000004020 conductor Substances 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 239000012212 insulator Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 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
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method 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
Images
Abstract
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本の信号ケーブルにドレイン線を引き揃え、それら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。
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ドレイン線を含めた３本撚り構造に着目した結果、従来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、複数本の信号ケーブル、および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、高周波差動信号を伝送するための３本ツイスト撚りケーブルが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、３本ツイスト撚りケーブル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３本ツイスト撚りケーブル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、図１の３本ツイスト撚りケーブルの横断面図である。
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、３本の信号ケーブル（１）からなる３本ツイスト撚りケーブル、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、３本ツイスト撚りケーブル（図では２組）を配したことに在る。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、３本ツイスト撚り構造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３本ツイスト撚りケーブル（２）により、高周波差動信号を伝送する際には、３本の信号ケーブル（１）のうち、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３本ツイスト撚りケーブル（２）を複数組配置すればよい。また、３本ツイスト撚りケーブル（２）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、極細同軸ケーブルの３本ツイスト撚りケーブル（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本ツイスト撚りケーブル（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３本ツイスト撚りケーブル構成とすることで、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本ツイスト撚りケーブル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】本発明の、３本ツイスト撚りケーブル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】図１の３本ツイスト撚りケーブルの横断面図である。
【符号の説明】
１ 信号ケーブル（単線）
１ａ 導体
１ｂ 絶縁体
２ ３本ツイスト撚りケーブル
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 employed 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 such demands, a harness is known which has a differential signal transmission cable in which drain wires are aligned on two signal cables and the outer periphery thereof is collectively covered with a metal tape such as an aluminum tape. Yes.
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 and has a problem when being 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]
As a result of paying attention to a three-strand structure including a drain line as a signal cable for transmitting a high-frequency differential signal, the present inventors have found that the conventional problems can be easily solved.
Thus, according to the present invention, in a harness including a plurality of signal cables and terminal portions for fixing the conductors of both end portions of each signal cable, at least a part of the plurality of signal cables includes a high-frequency difference. A differential signal transmission harness is provided in which a three twisted twisted cable for transmitting a dynamic signal is arranged.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a differential signal transmission harness using three independent signal cables (single wires) and two sets of three twisted twisted cables will be described with reference to the accompanying drawings.
FIG. 1 is a plan view showing an example of a differential signal transmission harness in which three twisted cables are arranged according to the present invention.
FIG. 2 is a cross-sectional view of the three twisted twisted cable of FIG.
1 to 2, (1) is a signal cable composed of a conductor (1a) and an insulator (1b), and (2) is from three signal cables (1) for transmitting a high-frequency differential signal. The three twisted cables, and (3) are terminal portions to which the conductors of both end portions of each cable are connected.
[0006]
A characteristic of the present invention is that three twisted cables (two sets in the figure) are arranged in a cable portion for transmitting differential signals, particularly high-frequency differential signals, among a plurality of independent signal cables. exist. 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 braid are generally known. However, in the present invention, in order to achieve both high-frequency transmission characteristics and flexibility, three twist cables are used. It is essential to adopt a twisted structure. 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 the three twisted cable (2), any two of the three signal cables (1) are used for high-frequency differential signal transmission, and the other one is used. What is necessary is just to allocate as a drain line. When transmitting a plurality of high-frequency differential signals, a plurality of sets of three twisted twisted cables (2) may be arranged according to the number of high-frequency differential signals to be transmitted. Moreover, there is no special restriction | limiting also about arrangement | positioning of a 3 twist twist cable (2), and it can arrange | position 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, it has been confirmed that this effect is ideally balanced in the three twisted cable (2) of the ultrafine coaxial cable. 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 twisted cables (2) for transmitting two types of high-frequency differential signals using six signal cables (1) among these cables were prepared. 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 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 the 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, particularly, the cable portion for transmitting a high-frequency differential signal has a three-twist twisted cable configuration, whereby excellent eye pattern characteristics can be obtained, and therefore, the high-frequency transmission characteristics are improved. At the same time, since the shape of the three twisted twisted cable is maintained in a twisted structure, the flexibility which cannot be obtained by the collective coating with the conventional metal tape is realized, and the workability at the time of assembling the harness is remarkably improved. .
[Brief description of the drawings]
FIG. 1 is a plan view showing an example of a differential signal transmission harness including a three twisted twisted cable according to the present invention.
2 is a cross-sectional view of the three twisted twisted cable of FIG. 1. FIG.
[Explanation of symbols]
1 Signal cable (single wire)
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 true JP2005019345A (en) | 2005-01-20 |
| JP3964832B2 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) |
Cited By (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
Cited By (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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3964832B2 (en) | 2007-08-22 |
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