JP4441663B2 - Flexible flat cable - Google Patents

Flexible flat cable Download PDF

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JP4441663B2
JP4441663B2 JP2004143241A JP2004143241A JP4441663B2 JP 4441663 B2 JP4441663 B2 JP 4441663B2 JP 2004143241 A JP2004143241 A JP 2004143241A JP 2004143241 A JP2004143241 A JP 2004143241A JP 4441663 B2 JP4441663 B2 JP 4441663B2
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cable
conductive portion
flexible flat
flat cable
signal line
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JP2005327530A (en
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英博 進藤
和光 古浜
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Iriso Electronics Co Ltd
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Iriso Electronics Co Ltd
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Description

本発明は、例えば小型電気機器の回路基板に接続して使用されるフレキシブルフラットケーブルに関するものである。   The present invention relates to a flexible flat cable used by being connected to a circuit board of a small electric device, for example.

従来、この種のフレキシブルフラットケーブルとしては、シート状に形成された絶縁性のケーブル本体の一方の面に互いに幅方向に間隔をおいて複数の導電部を設けるとともに、ケーブル本体の他方の面の先端側に板状の補強部材を配置し、各導電部をその先端側の一部を除いてシールド部材により被覆したものが知られている（例えば、特許文献１参照。）。
特開２００２−３５２６３１号公報 Conventionally, as this type of flexible flat cable, a plurality of conductive portions are provided on one surface of an insulating cable main body formed in a sheet shape at intervals in the width direction, and the other surface of the cable main body is provided. A plate-like reinforcing member is arranged on the front end side, and each conductive portion is covered with a shield member except for a part on the front end side (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2002-352631

しかしながら、前記フレキシブルフラットケーブルでは、各導電部の一部をグランド用導電部として使用し、他の導電部を信号線用導電部として使用するようにしているため、ケーブル本体の一方の面に信号線よりも多くの数の導電部を設ける必要があり、幅寸法が必要以上に大きくなるという問題点があった。また、ケーブル本体の一方の面に設けた導電部を信号線用とグランド用の導電部として用いる場合には、グランド用導電部は信号線用導電部と同様、幅が狭く形成されるため、グランド用としての機能を十分に果たせず、例えばグランド用導電部をシールド部材と導通させた場合には、ＥＭＩ（Electro Magnetic Interference：電磁波障害）を効果的に防止することができないという問題点もあった。   However, in the flexible flat cable, a part of each conductive part is used as a ground conductive part and the other conductive part is used as a signal line conductive part. There is a problem that it is necessary to provide a larger number of conductive parts than the line, and the width dimension becomes larger than necessary. In addition, when the conductive portion provided on one surface of the cable body is used as the conductive portion for the signal line and the ground, the conductive portion for the ground is formed narrow like the conductive portion for the signal line. For example, when the ground conductive portion is not electrically connected to the shield member, the EMI (Electro Magnetic Interference) cannot be effectively prevented. It was.

本発明は前記問題点に鑑みてなされたものであり、その目的とするところは、幅寸法を大きくせずにグランド用導電部を設けることができ、しかもグランド用導電部の機能を十分に発揮させることのできるフレキシブルフラットケーブルを提供することにある。   The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a ground conductive portion without increasing the width dimension, and to sufficiently exhibit the function of the ground conductive portion. An object of the present invention is to provide a flexible flat cable that can be used.

本発明は前記目的を達成するために、請求項１では、シート状に形成された可撓性のケーブル本体の一方の面に互いに幅方向に間隔をおいて複数の信号線用導電部を設けるとともに、ケーブル本体の他方の面の先端側に板状の補強部材を配置し、各信号線用導電部をその先端側の一部を除いてシールド部材により被覆したフレキシブルフラットケーブルにおいて、前記ケーブル本体の他方の面と補強部材の一方の面との間にシールド部材に導通する導電体を配置するとともに、補強部材の他方の面には導電体の一端側を補強部材の他方の面側に折り返してなるグランド用導電部を設けている。   In order to achieve the above object, according to the present invention, in claim 1, a plurality of signal line conductive portions are provided on one surface of a flexible cable body formed in a sheet shape and spaced from each other in the width direction. And a flexible flat cable in which a plate-shaped reinforcing member is disposed on the distal end side of the other surface of the cable body, and each signal line conductive portion is covered with a shield member except for a part of the distal end side. A conductor that conducts to the shield member is disposed between the other surface of the reinforcing member and the one surface of the reinforcing member, and one end side of the conductor is folded back to the other surface side of the reinforcing member on the other surface of the reinforcing member. A conductive portion for grounding is provided.

これにより、補強部材の他方の面にグランド用導電部が設けられることから、ケーブル本体の一方の面には信号線用導電部のみを設けることが可能となる。   Thus, since the ground conductive portion is provided on the other surface of the reinforcing member, it is possible to provide only the signal line conductive portion on one surface of the cable body.

本発明のフレキシブルフラットケーブルによれば、ケーブル本体の一方の面に信号線用導電部のみを設けることができるので、幅寸法を大きくせずにグランド用導電部を設けることができ、コネクタに接続される場合には、相手側コネクタを幅方向に小型化することができる。   According to the flexible flat cable of the present invention, since only the signal line conductive portion can be provided on one surface of the cable body, the ground conductive portion can be provided without increasing the width dimension and connected to the connector. In this case, the mating connector can be downsized in the width direction.

図１乃至図６は本発明の一実施形態を示すもので、図１はフレキシブルフラットケーブルの平面図、図２はその側面断面図、図３はその一方の面側を示す要部平面図、図４はその他方の面側を示す要部平面図、図５はその一部分解側面断面図、図６はコネクタへの挿入状態を示す側面断面図である。   1 to 6 show an embodiment of the present invention, FIG. 1 is a plan view of a flexible flat cable, FIG. 2 is a side sectional view thereof, and FIG. 3 is a plan view of an essential part showing one side of the flexible flat cable. 4 is a principal plan view showing the other surface side, FIG. 5 is a partially exploded side sectional view thereof, and FIG. 6 is a side sectional view showing a state of insertion into the connector.

同図に示すフレキシブルフラットケーブル１（以下、ケーブル１という。）は、シート状に形成された絶縁性のケーブル本体２と、ケーブル本体２の一方の面に互いに幅方向に間隔をおいて設けられた複数の信号線用導電部３と、ケーブル本体２の他方の面に配置された補強板４と、ケーブル本体２の他方の面と補強板４の一方の面との間に配置されたシート状の導電体５と、補強板４の他方の面に設けられたグランド用導電部６と、ケーブル本体２をその端部を除いて被覆するシールド部材７とからなり、各信号線用導電部３はその先端側から所定長さＬだけ除く部分を絶縁被覆８によって覆われている。   A flexible flat cable 1 (hereinafter referred to as a cable 1) shown in the figure is provided with an insulating cable main body 2 formed in a sheet shape and one surface of the cable main body 2 spaced apart from each other in the width direction. A plurality of signal line conductive portions 3, a reinforcing plate 4 disposed on the other surface of the cable body 2, and a sheet disposed between the other surface of the cable body 2 and one surface of the reinforcing plate 4. Each of the signal line conductive portions 5, a ground conductive portion 6 provided on the other surface of the reinforcing plate 4, and a shield member 7 that covers the cable body 2 except for its end portions. 3 is covered with an insulating coating 8 except for a predetermined length L from the tip side.

ケーブル本体２は合成樹脂等の可撓性部材からなり、ケーブルの長さ方向に延びる帯状に形成されている。   The cable body 2 is made of a flexible member such as a synthetic resin, and is formed in a strip shape extending in the cable length direction.

各信号線用導電部３はケーブル本体２の表面に半田メッキ等により形成された金属製被膜からなり、ケーブル本体２の全長に亘って形成されている。   Each signal line conductive portion 3 is made of a metal coating formed on the surface of the cable body 2 by solder plating or the like, and is formed over the entire length of the cable body 2.

補強板４はケーブル本体２と同等の幅に形成された合成樹脂製の部材からなり、ケーブル本体２の両端側にそれぞれ設けられている（一端側のみ図示）。この場合、補強板４の一端側はケーブル本体２の先端と同一位置に配置され、その他端側部２ａはケーブル本体２側と分離されている。   The reinforcing plate 4 is made of a synthetic resin member formed to have the same width as the cable body 2 and is provided on both ends of the cable body 2 (only one end is shown). In this case, one end side of the reinforcing plate 4 is disposed at the same position as the tip of the cable main body 2, and the other end side portion 2 a is separated from the cable main body 2 side.

導電体５は半田メッキ等の導電性表面処理が施された可撓性部材からなり、ケーブル本体２の全長よりも長く形成されている。導電体５は一方の面をケーブル本体２の他方の面に接着され、その他方の面には補強板４の一方の面（他端部２ａを除く）が接着されている。この場合、導電体５の一端側は補強板４の先端を介して補強板４の他方の面側に長手方向に折り返され、その折り返し部分を補強板４の他方の面に接着されている。   The conductor 5 is made of a flexible member that has been subjected to a conductive surface treatment such as solder plating, and is formed longer than the entire length of the cable body 2. The conductor 5 has one surface bonded to the other surface of the cable body 2 and the other surface bonded to one surface of the reinforcing plate 4 (excluding the other end 2a). In this case, one end side of the conductor 5 is folded back in the longitudinal direction to the other surface side of the reinforcing plate 4 via the tip of the reinforcing plate 4, and the folded portion is bonded to the other surface of the reinforcing plate 4.

グランド用導電部６は導電体５の折り返し部分によって形成され、補強板４と同等の全幅に亘って形成されている。また、グランド用導電部６は、各信号線用導電部３の先端側露出部分の長さＬと同等の長さに形成されている。   The ground conductive portion 6 is formed by a folded portion of the conductor 5, and is formed over the entire width equivalent to the reinforcing plate 4. In addition, the ground conductive portion 6 is formed to have a length equivalent to the length L of the exposed end portion of each signal line conductive portion 3.

シールド部材７は銅箔等の薄膜状の金属部材からなり、ケーブル本体２、各信号線用導電部３、導電体５及び絶縁被覆８の両面側及び幅方向両端側を覆うように設けられている。この場合、シールド部材７は導電体５と導通している。   The shield member 7 is made of a thin-film metal member such as copper foil, and is provided so as to cover both sides of the cable body 2, each signal line conductive portion 3, the conductor 5, and the insulating coating 8 and both ends in the width direction. Yes. In this case, the shield member 7 is electrically connected to the conductor 5.

以上のように構成されたケーブル１は、例えば図６示すコネクタ１０に接続される。即ち、同図に示すコネクタ１０は、ケーブル１の一端側を挿入可能なハウジング１１と、ハウジング１１内に互いに幅方向に間隔をおいて配置された複数の端子１２と、ハウジングを覆うシェル１３とから構成されている。ハウジング１１は合成樹脂の成型品からなり、前面側を開口した箱状に形成されている。各端子１２は前端側に互いに上下方向に間隔をおいて前方に二股状に延びる弾性片部１２ａ及び固定片部１２ｂを有し、その後端側には図示しない基板に接続される基板接続部１２ｃが設けられている。シェル１３は導電性の金属からなり、ハウジング１１の上面、下面及び両側面を覆うように形成されている。シェル１３の下面側にはケーブル１のグランド用導電部６に接触するグランド用接触部１３ａが幅方向複数箇所に設けられている。また、シェル１３は、図示しない基板に接続されるようになっている。   The cable 1 configured as described above is connected to, for example, a connector 10 shown in FIG. That is, the connector 10 shown in the figure includes a housing 11 into which one end side of the cable 1 can be inserted, a plurality of terminals 12 arranged in the housing 11 at intervals in the width direction, and a shell 13 that covers the housing. It is composed of The housing 11 is made of a synthetic resin molded product, and is formed in a box shape having an open front side. Each terminal 12 has an elastic piece portion 12a and a fixed piece portion 12b that extend in a fork-like manner at an interval in the vertical direction on the front end side, and a board connection portion 12c that is connected to a board (not shown) on the rear end side. Is provided. The shell 13 is made of a conductive metal and is formed so as to cover the upper surface, the lower surface, and both side surfaces of the housing 11. On the lower surface side of the shell 13, ground contact portions 13 a that contact the ground conductive portions 6 of the cable 1 are provided at a plurality of positions in the width direction. The shell 13 is connected to a substrate (not shown).

前記コネクタ１０にケーブル１を接続する場合は、図６に示すようにケーブル１の一端側をその一方の面（信号線用導電部３側の面）を上方に向けてハウジング１１に前方から挿入すると、ケーブル１の各信号線用導電部３が各端子１２の弾性片部１２ａにそれぞれ接触し、ケーブル１のグランド用導電部６がシェル１３の各グランド用接触部１３ａに接触する。その際、ケーブル１との圧接により、各弾性片部１２ａが上方に弾性変形し、各グランド用接触部１３ａが下方に弾性変形する。これにより、ケーブル１の各信号線が各端子１２を介して基板の信号線用導電部（図示せず）に導通し、ケーブル１のグランド及びシールド部材７がグランド用導電部６及びシェル１３を介して基板のグランド用導電部（図示せず）に導通する。   When the cable 1 is connected to the connector 10, as shown in FIG. 6, the cable 1 is inserted into the housing 11 from the front side with one side thereof facing upward (the surface on the signal line conductive portion 3 side). Then, each signal line conductive portion 3 of the cable 1 comes into contact with the elastic piece portion 12 a of each terminal 12, and the ground conductive portion 6 of the cable 1 comes into contact with each ground contact portion 13 a of the shell 13. At that time, due to the pressure contact with the cable 1, each elastic piece 12a is elastically deformed upward, and each ground contact portion 13a is elastically deformed downward. As a result, each signal line of the cable 1 is conducted to the signal line conductive portion (not shown) of the substrate through each terminal 12, and the ground of the cable 1 and the shield member 7 connect the ground conductive portion 6 and the shell 13. To the ground conductive portion (not shown) of the substrate.

本実施形態によれば、ケーブル本体２の一方の面に各信号線用導電部３を設けるとともに、ケーブル本体２の他方の面と補強板４の一方の面との間にシールド部材７に導通する導電体５を配置し、補強板４の他方の面には導電体５の一端側を補強板４の他方の面側に折り返してなるグランド用導電部６を設けたので、ケーブル本体２の一方の面には各信号線用導電部３のみを設けることができる。これにより、ケーブル１の幅寸法を大きくせずにグランド用導電部６を設けることができ、コネクタ１０を幅方向に小型化することができる。この場合、導電体５の一端側を補強板４の他方の面側に折り返すようにしたので、補強板４の他方の面にグランド用導電部６を容易に形成することができるとともに、コネクタ１０の端子１２との接触による導電体５の剥離を防止することができ、耐久性の向上を図ることもできる。   According to the present embodiment, each signal line conductive portion 3 is provided on one surface of the cable body 2 and is electrically connected to the shield member 7 between the other surface of the cable body 2 and one surface of the reinforcing plate 4. The conductor 5 to be grounded is disposed, and the grounding conductive portion 6 formed by folding one end of the conductor 5 back to the other surface of the reinforcing plate 4 is provided on the other surface of the reinforcing plate 4. Only one signal line conductive portion 3 can be provided on one surface. Accordingly, the ground conductive portion 6 can be provided without increasing the width dimension of the cable 1, and the connector 10 can be reduced in the width direction. In this case, since one end side of the conductor 5 is folded back to the other surface side of the reinforcing plate 4, the ground conductive portion 6 can be easily formed on the other surface of the reinforcing plate 4 and the connector 10. It is possible to prevent the conductor 5 from being peeled off by contact with the terminal 12 and to improve durability.

また、グランド用導電部６をケーブル本体２の幅と同等の幅寸法に形成したので、グランド用導電部６の機能を十分に発揮させることができ、グランド用導電部６をシールド部材７と導通させることにより、電磁波障害の防止効果を格段に向上させることができる。   Further, since the ground conductive portion 6 is formed to have a width dimension equivalent to the width of the cable body 2, the function of the ground conductive portion 6 can be sufficiently exerted, and the ground conductive portion 6 is electrically connected to the shield member 7. By doing so, the effect of preventing electromagnetic interference can be remarkably improved.

更に、補強板４の一端側をケーブル本体２側に接合し、その他端部２ａをケーブル本体２側と分離させるようにしたので、ケーブル本体２の他端部２ａを把持することにより、ケーブル１をコネクタ１０に容易に抜き差しすることができる。   Further, since one end side of the reinforcing plate 4 is joined to the cable main body 2 side and the other end 2a is separated from the cable main body 2 side, the cable 1 can be obtained by gripping the other end 2a of the cable main body 2. Can be easily inserted into and removed from the connector 10.

この場合、補強板４を合成樹脂によって形成したので、金属板によって形成する場合よりも安価に製造することができ、低コスト化に有利である。   In this case, since the reinforcing plate 4 is made of a synthetic resin, it can be manufactured at a lower cost than when it is made of a metal plate, which is advantageous for cost reduction.

尚、前記実施形態では、導電体５の一端側を補強板４の先端を介して補強板４の他方の面側に長さ方向に折り返すようにしたものを示したが、例えば導電体５の一端側に幅方向に延出する部分を形成し、この延出部分を補強板４の他方の面側に幅方向に折り返すようにしてもよい。   In the above-described embodiment, one end side of the conductor 5 is folded back in the length direction to the other surface side of the reinforcing plate 4 via the tip of the reinforcing plate 4. A portion extending in the width direction may be formed on one end side, and the extending portion may be folded back in the width direction on the other surface side of the reinforcing plate 4.

本発明の一実施形態を示すフレキシブルフラットケーブルの平面図The top view of the flexible flat cable which shows one Embodiment of this invention フレキシブルフラットケーブルの側面断面図Side sectional view of flexible flat cable フレキシブルフラットケーブルの一方の面側を示す要部平面図The principal part top view which shows one surface side of a flexible flat cable フレキシブルフラットケーブルの他方の面側を示す要部平面図The principal part top view which shows the other surface side of a flexible flat cable フレキシブルフラットケーブルの一部分解側面断面図Partially exploded side sectional view of flexible flat cable コネクタへの挿入状態を示す側面断面図Side sectional view showing the state of insertion into the connector

符号の説明Explanation of symbols

１…フレキシブルフラットケーブル、２…ケーブル本体、３…信号線用導電部、４…補強板、５…導電体、６…グランド用導電部、１０…ハウジング、１５…突片、２０…端子、３０…シェル、３１…グランド用接触部。   DESCRIPTION OF SYMBOLS 1 ... Flexible flat cable, 2 ... Cable main body, 3 ... Signal line conductive part, 4 ... Reinforcing plate, 5 ... Conductor, 6 ... Ground conductive part, 10 ... Housing, 15 ... Projection piece, 20 ... Terminal, 30 ... shell, 31 ... contact part for ground.

Claims (4)

シート状に形成された可撓性のケーブル本体の一方の面に互いに幅方向に間隔をおいて複数の信号線用導電部を設けるとともに、ケーブル本体の他方の面の先端側に板状の補強部材を配置し、各信号線用導電部をその先端側の一部を除いてシールド部材により被覆したフレキシブルフラットケーブルにおいて、
前記ケーブル本体の他方の面と補強部材の一方の面との間にシールド部材に導通する導電体を配置するとともに、
補強部材の他方の面には導電体の一端側を補強部材の他方の面側に折り返してなるグランド用導電部を設けた
ことを特徴とするフレキシブルフラットケーブル。 A plurality of signal line conductive portions are provided on one surface of a flexible cable body formed in a sheet shape at intervals in the width direction, and a plate-shaped reinforcement is provided on the distal end side of the other surface of the cable body. In a flexible flat cable in which a member is arranged and each signal line conductive portion is covered with a shield member except for a part on the tip side,
While arranging a conductor conducting to the shield member between the other surface of the cable body and one surface of the reinforcing member,
A flexible flat cable, characterized in that a grounding conductive portion formed by folding one end of a conductor back to the other surface of the reinforcing member is provided on the other surface of the reinforcing member. 前記グランド用導電部をケーブル本体の幅と同等の幅寸法に形成した
ことを特徴とする請求項１記載のフレキシブルフラットケーブル。 The flexible flat cable according to claim 1, wherein the ground conductive portion is formed to have a width dimension equivalent to the width of the cable body. 前記補強部材をその一端側がケーブル本体側に接合され、その他端側がケーブル本体側と分離するように設けた
ことを特徴とする請求項１または２記載のフレキシブルフラットケーブル。 The flexible flat cable according to claim 1, wherein the reinforcing member is provided such that one end side thereof is joined to the cable body side and the other end side is separated from the cable body side. 前記補強部材を合成樹脂によって形成した
ことを特徴とする請求項１、２または３記載のフレキシブルフラットケーブル。 The flexible flat cable according to claim 1, wherein the reinforcing member is made of a synthetic resin.
JP2004143241A 2004-05-13 2004-05-13 Flexible flat cable Expired - Fee Related JP4441663B2 (en)

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