JP7006489B2

JP7006489B2 - Shielded flat cable

Info

Publication number: JP7006489B2
Application number: JP2018086414A
Authority: JP
Inventors: 千明小島; 龍男松田
Original assignee: Sumitomo Electric Industries Ltd
Current assignee: Sumitomo Electric Industries Ltd
Priority date: 2018-04-27
Filing date: 2018-04-27
Publication date: 2022-01-24
Anticipated expiration: 2038-04-27
Also published as: JP2019192575A

Description

本発明は、シールドフラットケーブルに関する。 The present invention relates to a shielded flat cable.

フレキシブルフラットケーブル（ＦＦＣ）は、ＣＤやＤＶＤプレーヤ等のＡＶ機器、コピー機やプリンタ等のＯＡ機器、その他電子・情報機器の内部配線等の多くの分野で、省スペース化と簡便な接続を目的として用いられている。また、機器の信号周波数が高くなるとノイズの影響が大きくなることから、シールドされたシールドフラットケーブルが用いられる。 Flexible flat cables (FFCs) are intended for space saving and easy connection in many fields such as AV equipment such as CDs and DVD players, OA equipment such as copiers and printers, and internal wiring of other electronic and information equipment. It is used as. Further, since the influence of noise increases as the signal frequency of the device increases, a shielded flat cable is used.

シールドフラットケーブルのシールドは、例えば、ＦＦＣの外側にシールド層を設けることにより行われる。また、シールドフラットケーブルは、端部にコネクタに接続される端末部を有している。この端末部で、シールド層をコネクタに備えられたグランドパッドへ接地接続するための構造が必要となる。例えば、特許文献１には、シールド層に電気的に接続されたグランド導体を有するシールドフラットケーブルが開示されている。 Shielding of a shielded flat cable is performed, for example, by providing a shield layer on the outside of the FFC. Further, the shielded flat cable has a terminal portion connected to the connector at the end portion. In this terminal portion, a structure for grounding and connecting the shield layer to the ground pad provided in the connector is required. For example, Patent Document 1 discloses a shielded flat cable having a ground conductor electrically connected to a shield layer.

特開２０１０－１５３１９１号公報Japanese Unexamined Patent Publication No. 2010-153191

ＦＦＣが接続される基板側には、通常、ＦＦＣの平行に配列された複数本の平形導体の露出面に接触する複数の端子を備えたコネクタが設けられている。特許文献１に開示されたシールドフラットケーブルでは、平行に配列された複数本の平形導体の端子部の露出面と、グランド導体の露出面とは厚み方向の高さ位置が異なる。このため、グランド導体を接地させるために、グランド導体をコネクタの金属シェルに接触させたり、平形導体用の端子とは異なる厚み方向の高さにグランド用端子を別途設けたりする必要が生じる。また、コネクタによっては、構造の自由度を増すために、金属シェルや、グランド用端子を設けない場合がある。 On the substrate side to which the FFC is connected, a connector having a plurality of terminals that come into contact with the exposed surfaces of a plurality of flat conductors arranged in parallel of the FFC is usually provided. In the shielded flat cable disclosed in Patent Document 1, the height position in the thickness direction is different between the exposed surface of the terminal portion of a plurality of flat conductors arranged in parallel and the exposed surface of the ground conductor. Therefore, in order to ground the ground conductor, it is necessary to bring the ground conductor into contact with the metal shell of the connector, or to separately provide a ground terminal at a height in the thickness direction different from the terminal for the flat conductor. Further, depending on the connector, a metal shell or a ground terminal may not be provided in order to increase the degree of freedom of the structure.

本発明は、これらの実情に鑑みてなされたものであり、簡単な構造で、複数本の平形導体とともにシールド層を、基板側の端子に確実に接続することができるシールドフラットケーブルを提供することをその目的とする。 The present invention has been made in view of these circumstances, and provides a shielded flat cable having a simple structure and capable of reliably connecting a shield layer together with a plurality of flat conductors to terminals on the substrate side. Is the purpose.

本発明の一態様に係るシールドフラットケーブルは、平行に配列された複数本の信号用導体と、前記信号用導体の並列方向で最外の信号用導体に隣接する接地用導体と、前記信号用導体と前記接地用導体の並列面の両面に貼り合わされた一対の絶縁層と、該絶縁層の少なくとも一方を覆うシールド層を有し、一方の前記絶縁層の長さ方向の端部から所定の範囲まで前記信号用導体及び前記接地用導体が露出したケーブル端末部が形成されたシールドフラットケーブルであって、前記接地用導体の露出範囲の一方の前記絶縁層の長さ方向の端部からの距離をＬｂ、他の前記信号用導体の露出範囲の一方の前記絶縁層の長さ方向の端部からの距離をＬａとしたとき、Ｌｂ＞Ｌａであり、少なくとも一方の前記絶縁層の外周側に設けられ、前記ケーブルの幅方向にわたって延在するグランド導体が、一方の前記絶縁層の長さ方向の端部から距離Ｌａと距離Ｌｂとの間の範囲において、前記接地用導体と前記シールド層とに電気的に接続されている。
また、本発明の一態様に係るシールドフラットケーブルは、平行に配列された複数本の導体と、複数本の該導体の並列面の両面に貼り合わされた一対の絶縁層と、該絶縁層の少なくとも一方を覆うシールド層と、少なくとも一方の前記絶縁層の外周側に設けたグランド導体を有し、一方の前記絶縁層の長さ方向の端部で前記導体が露出したケーブル端末部が形成されたシールドフラットケーブルであって、複数本の導体は、平行に配列された複数本の信号用導体と、前記信号用導体の並列方向で最外の信号用導体の内の一方に隣接する第１接地用導体と、前記信号用導体の並列方向で最外の信号用導体の内の他方に隣接する第２接地用導体と、を有し、前記シールド層は、前記並列方向での一方の側面が前記第１接地用導体と前記一方の信号用導体の間に設けられ、前記並列方向での他方の側面が前記第２接地用導体と前記他方の信号用導体の間に設けられ、前記グランド導体は、前記絶縁層に設けられた第１開口部を介して前記第１接地用導体と電気的に接続し、前記絶縁層に設けられた第２開口部を介して前記第２接地用導体と電気的に接続し、前記第１開口部と前記第２開口部とに挟まれた領域で前記シールド層と電気的に接続されている。 The shield flat cable according to one aspect of the present invention includes a plurality of signal conductors arranged in parallel, a grounding conductor adjacent to the outermost signal conductor in the parallel direction of the signal conductor, and the signal conductor. It has a pair of insulating layers bonded to both sides of the parallel surface of the conductor and the grounding conductor , and a shield layer covering at least one of the insulating layers . A shielded flat cable in which a cable terminal portion in which the signal conductor and the grounding conductor are exposed is formed up to a range , from one end of the insulating layer in the length direction of the exposed range of the grounding conductor. When the distance is Lb and the distance from the end in the length direction of one of the exposed ranges of the other signal conductor is La, Lb> La, and at least the outer peripheral side of the insulating layer. The ground conductor extending in the width direction of the cable is provided in the above-mentioned ground conductor and the shield in the range between the distance La and the distance Lb from the lengthwise end of one of the insulating layers. It is electrically connected to the layer.
Further, the shield flat cable according to one aspect of the present invention includes a plurality of conductors arranged in parallel, a pair of insulating layers bonded to both sides of the parallel surfaces of the plurality of conductors, and at least the insulating layer. A cable terminal portion having a shield layer covering one and a ground conductor provided on the outer peripheral side of at least one of the insulating layers, and the conductor exposed at the end portion of one of the insulating layers in the length direction was formed. In a shielded flat cable, the plurality of conductors are a plurality of signal conductors arranged in parallel and a first ground contact adjacent to one of the outermost signal conductors in the parallel direction of the signal conductors. The shield layer has a conductor for grounding and a second grounding conductor adjacent to the other of the outermost signal conductors in the parallel direction of the signal conductor, and the shield layer has one side surface in the parallel direction. The ground conductor is provided between the first grounding conductor and the one signal conductor, and the other side surface in the parallel direction is provided between the second grounding conductor and the other signal conductor. Is electrically connected to the first grounding conductor through the first opening provided in the insulating layer, and is connected to the second grounding conductor through the second opening provided in the insulating layer. It is electrically connected and is electrically connected to the shield layer in a region sandwiched between the first opening and the second opening.

本発明によれば、シールド層を、信号用導体の少なくとも一方の並列方向最外側に位置する接地用導体にグランド導体を介して電気的に接続できるため、シールド層を、基板側のコネクタの端子に確実に電気的接続することができる。 According to the present invention, since the shield layer can be electrically connected to the grounding conductor located on the outermost side in the parallel direction of at least one of the signal conductors via the ground conductor, the shield layer can be connected to the connector on the substrate side. It can be securely electrically connected to the terminal.

本発明の第１の実施形態に係るシールドフラットケーブルの概略を示す図である。It is a figure which shows the outline of the shield flat cable which concerns on 1st Embodiment of this invention. 本発明の第１の実施形態に係るシールドフラットケーブルの製造過程の一例を説明するための図である。It is a figure for demonstrating an example of the manufacturing process of the shielded flat cable which concerns on 1st Embodiment of this invention. 本発明の第１の実施形態に係るシールドフラットケーブルの製造過程の一例を説明するための図である。It is a figure for demonstrating an example of the manufacturing process of the shielded flat cable which concerns on 1st Embodiment of this invention. 本発明の第１の実施形態に係るシールドフラットケーブルの製造過程の一例を説明するための図である。It is a figure for demonstrating an example of the manufacturing process of the shielded flat cable which concerns on 1st Embodiment of this invention. 本発明の第１の実施形態に係るシールドフラットケーブルの製造過程を説明するための図である。It is a figure for demonstrating the manufacturing process of the shielded flat cable which concerns on 1st Embodiment of this invention. 本発明の第２の実施形態に係るシールドフラットケーブルの概略を示す図である。It is a figure which shows the outline of the shield flat cable which concerns on 2nd Embodiment of this invention. 本発明の第２の実施形態に係るシールドフラットケーブルの製造過程の一例を説明するための図である。It is a figure for demonstrating an example of the manufacturing process of the shielded flat cable which concerns on 2nd Embodiment of this invention. 本発明の第２の実施形態に係るシールドフラットケーブルの製造過程の一例を説明するための図である。It is a figure for demonstrating an example of the manufacturing process of the shielded flat cable which concerns on 2nd Embodiment of this invention. 本発明の第２の実施形態に係るシールドフラットケーブルの製造過程の一例を説明するための図である。It is a figure for demonstrating an example of the manufacturing process of the shielded flat cable which concerns on 2nd Embodiment of this invention. 本発明の第３の実施形態に係るシールドフラットケーブルのグランド導体部分での断面図である。It is sectional drawing in the ground conductor part of the shield flat cable which concerns on 3rd Embodiment of this invention.

（本願発明の実施形態の説明）
最初に本願発明の実施態様を列記して説明する。
（１）本発明の一態様に係るシールドフラットケーブルは、平行に配列された複数本の信号用導体と、前記信号用導体の並列方向で最外の信号用導体に隣接する接地用導体と、前記信号用導体と前記接地用導体の並列面の両面に貼り合わされた一対の絶縁層と、該絶縁層の少なくとも一方を覆うシールド層を有し、一方の前記絶縁層の長さ方向の端部から所定の範囲まで前記信号用導体及び前記接地用導体が露出したケーブル端末部が形成されたシールドフラットケーブルであって、前記接地用導体の露出範囲の一方の前記絶縁層の長さ方向の端部からの距離をＬｂ、他の前記信号用導体の露出範囲の一方の前記絶縁層の長さ方向の端部からの距離をＬａとしたとき、Ｌｂ＞Ｌａであり、少なくとも一方の前記絶縁層の外周側に設けられ、前記ケーブルの幅方向にわたって延在するグランド導体が、一方の前記絶縁層の長さ方向の端部から距離Ｌａと距離Ｌｂとの間の範囲において、前記接地用導体と前記シールド層とに電気的に接続されている。 (Explanation of Embodiment of the present invention)
First, embodiments of the present invention will be described in a list.
(1) The shield flat cable according to one aspect of the present invention includes a plurality of signal conductors arranged in parallel, a grounding conductor adjacent to the outermost signal conductor in the parallel direction of the signal conductor, and the like. It has a pair of insulating layers bonded to both sides of a parallel surface of the signal conductor and the grounding conductor , and a shield layer covering at least one of the insulating layers, and the end portion of one of the insulating layers in the length direction. A shielded flat cable in which a cable terminal portion in which the signal conductor and the grounding conductor are exposed is formed from to a predetermined range , and one end of the insulating layer in the length direction of the exposed range of the grounding conductor. When the distance from the portion is Lb and the distance from the end portion in the length direction of one of the insulating layers in the exposed range of the other signal conductor is La, Lb> La, and at least one of the insulating layers. The ground conductor provided on the outer peripheral side of the cable and extending in the width direction of the cable is the ground conductor in the range between the distance La and the distance Lb from the lengthwise end of one of the insulating layers. Is electrically connected to the shield layer.

この構成により、シールド層を、信号用導体の少なくとも一方の並列方向最外側に位置する接地用導体にグランド導体を介して電気的に接続できるため、シールド層を、基板側のコネクタの端子に確実に電気的接続することができる。 With this configuration, the shield layer can be electrically connected to the grounding conductor located on the outermost side of at least one of the signal conductors in the parallel direction via the ground conductor, so that the shield layer can be connected to the terminal of the connector on the substrate side. A reliable electrical connection can be made.

（２）本発明の一態様に係るシールドフラットケーブルは、平行に配列された複数本の導体と、複数本の該導体の並列面の両面に貼り合わされた一対の絶縁層と、該絶縁層の少なくとも一方を覆うシールド層と、少なくとも一方の前記絶縁層の外周側に設けたグランド導体を有し、一方の前記絶縁層の長さ方向の端部で前記導体が露出したケーブル端末部が形成されたシールドフラットケーブルであって、複数本の導体は、平行に配列された複数本の信号用導体と、前記信号用導体の並列方向で最外の信号用導体の内の一方に隣接する第１接地用導体と、前記信号用導体の並列方向で最外の信号用導体の内の他方に隣接する第２接地用導体と、を有し、前記シールド層は、前記並列方向での一方の側面が前記第１接地用導体と前記一方の信号用導体の間に設けられ、前記並列方向での他方の側面が前記第２接地用導体と前記他方の信号用導体の間に設けられ、前記グランド導体は、前記絶縁層に設けられた第１開口部を介して前記第１接地用導体と電気的に接続し、前記絶縁層に設けられた第２開口部を介して前記第２接地用導体と電気的に接続し、前記第１開口部と前記第２開口部とに挟まれた領域で前記シールド層と電気的に接続されている。この構成により、グランド導体が、絶縁層に設けられた第１開口部を介して第１接地用導体と電気的に接続し、前記絶縁層に設けられた第２開口部を介して前記第２接地用導体と電気的に接続し、前記第１開口部と前記第２開口部とに挟まれた領域で前記シールド層と電気的に接続されているから、シールド層を、基板側のコネクタの端子に確実に電気的接続することができる。 (2) The shield flat cable according to one aspect of the present invention comprises a plurality of conductors arranged in parallel, a pair of insulating layers bonded to both sides of the parallel surfaces of the plurality of conductors, and the insulating layer. A cable terminal portion having a shield layer covering at least one and a ground conductor provided on the outer peripheral side of at least one of the insulating layers, and the conductor exposed at the end portion of one of the insulating layers in the length direction is formed. In the shielded flat cable, the plurality of conductors are the plurality of signal conductors arranged in parallel and the first one adjacent to one of the outermost signal conductors in the parallel direction of the signal conductors. It has a grounding conductor and a second grounding conductor adjacent to the other of the outermost signal conductors in the parallel direction of the signal conductor, and the shield layer is one side surface in the parallel direction. Is provided between the first grounding conductor and the one signal conductor, and the other side surface in the parallel direction is provided between the second grounding conductor and the other signal conductor, and the ground is provided. The conductor is electrically connected to the first grounding conductor through the first opening provided in the insulating layer, and the second grounding conductor is electrically connected to the second grounding conductor through the second opening provided in the insulating layer. Is electrically connected to the shield layer in a region sandwiched between the first opening and the second opening. With this configuration, the ground conductor is electrically connected to the first grounding conductor through the first opening provided in the insulating layer, and the second opening is provided in the insulating layer. Since it is electrically connected to the grounding conductor and electrically connected to the shield layer in the region sandwiched between the first opening and the second opening, the shield layer is connected to the connector on the substrate side. It can be securely electrically connected to the terminal.

（３）前記グランド導体が、前記絶縁層と前記シールド層との間に設けられていてもよい。この構成により、接地用導体とグランド導体との厚み方向の段差を小さくすることができ、接地用導体とこの接地用導体に隣接する信号用導体との間隔を小さくすることができる。 (3) The ground conductor may be provided between the insulating layer and the shield layer. With this configuration, the step in the thickness direction between the grounding conductor and the ground conductor can be reduced, and the distance between the grounding conductor and the signal conductor adjacent to the grounding conductor can be reduced.

（４）前記グランド導体が、前記絶縁層上に設けた前記シールド層の外周側に接して設けられていてもよい。この構成によりケーブル端末部付近において、複数の信号用導体とシールド層との間隔を小さくすることができ、良好なシールド効果が得られる。
（５）前記シールドフラットケーブルの長手方向の端部において、前記絶縁層に、前記接地用導体が前記信号用導体よりも長く露出する切り欠き部と、前記切り欠き部に隣接するとともに前記信号用導体と重畳する凸部が設けられ、前記シールドフラットケーブルの長手方向において、前記グランド導体の一方の側面は、前記凸部の側面に沿うように設けられ、前記グランド導体の他方の側面は、前記切り欠き部の側面に沿うように設けられ、前記グランド導体と前記接地用導体は、前記切り欠き部と重畳する位置で電気的に接続され、前記グランド導体と前記シールド層は、凸部と重畳する位置で電気的に接続されている。この構成により絶縁層の上面と接地用導体の露出面との段差の影響を小さくし、グランド導体と接地用導体との電気的接続を確実にすることができる。 (4) The ground conductor may be provided in contact with the outer peripheral side of the shield layer provided on the insulating layer. With this configuration, the distance between the plurality of signal conductors and the shield layer can be reduced in the vicinity of the cable terminal portion, and a good shielding effect can be obtained.
(5) At the longitudinal end of the shielded flat cable, a notch in which the grounding conductor is exposed longer than the signal conductor and a notch adjacent to the notch and for the signal are exposed in the insulating layer. A convex portion that overlaps with the conductor is provided, and in the longitudinal direction of the shield flat cable, one side surface of the ground conductor is provided along the side surface of the convex portion, and the other side surface of the ground conductor is the said. Provided along the side surface of the notch portion, the ground conductor and the grounding conductor are electrically connected at a position where they overlap with the notch portion, and the ground conductor and the shield layer overlap with the convex portion. It is electrically connected at the position where it is used. With this configuration, the influence of the step between the upper surface of the insulating layer and the exposed surface of the grounding conductor can be reduced, and the electrical connection between the ground conductor and the grounding conductor can be ensured.

（６）前記接地用導体が、他の前記信号用導体よりも配列方向の幅が広く形成されていてもよい。この構成より、グランド導体を介してシールド層を確実にコネクタの接地用端子へ接続することができる。 (6) The grounding conductor may be formed to have a wider width in the arrangement direction than the other signal conductors. With this configuration, the shield layer can be reliably connected to the grounding terminal of the connector via the ground conductor.

（７）前記グランド導体が、一対の前記絶縁層の周囲に設けられ、前記シールド層が、一対の前記絶縁層のそれぞれの外周側で前記グランド導体に接して設けられていてもよい。この構成により、絶縁層を介して信号用導体の並列面を挟むようにシールド層を設けることができるため、良好なシールド効果を得ることができる。 (7) The ground conductor may be provided around the pair of the insulating layers, and the shield layer may be provided in contact with the ground conductor on the outer peripheral side of each of the pair of the insulating layers. With this configuration, since the shield layer can be provided so as to sandwich the parallel surface of the signal conductor via the insulating layer, a good shielding effect can be obtained.

以下、図面を参照しながら、本発明のシールドフラットケーブルに係る好適な実施形態について説明する。以下の説明において、異なる図面においても同じ符号を付した構成は同様のものであるとして、その説明を省略する場合がある。なお、本発明はこれらの実施形態での例示に限定されるものではなく、特許請求の範囲に記載された事項の範囲内および均等の範囲内におけるすべての変更を含む。また、複数の実施形態について組み合わせが可能である限り、本発明は任意の実施形態を組み合わせたものを含む。 Hereinafter, a preferred embodiment of the shielded flat cable of the present invention will be described with reference to the drawings. In the following description, the configurations with the same reference numerals may be omitted because the configurations with the same reference numerals are the same in different drawings. It should be noted that the present invention is not limited to the examples in these embodiments, but includes all modifications within the scope of the matters described in the claims and within the scope of equality. Further, as long as a combination of a plurality of embodiments is possible, the present invention includes a combination of arbitrary embodiments.

（第１の実施形態）
図１は、本発明の第１の実施形態に係るシールドフラットケーブルの概略を示す図であり、図１（Ａ）は斜視図、図１（Ｂ）は、図１（Ａ）の１Ｂ－１Ｂにおける断面図である。 (First Embodiment)
1A and 1B are views showing an outline of a shielded flat cable according to a first embodiment of the present invention, FIG. 1A is a perspective view, FIG. 1B is a perspective view, and FIG. 1B is 1B-1B of FIG. 1A. It is a cross-sectional view in.

本実施形態によるシールドフラットケーブル１は、複数本の平形導体１１、絶縁層２１，２２、グランド導体３１、および、シールド層４１から構成される。シールドフラットケーブル１は、例えば、断面が平形形状でＸ軸方向に延びる平形導体１１をＹ軸方向に複数本平行に並べ、平形導体１１の並列面（ＸＹ平面）と直交する方向（Ｚ方向）の両面を絶縁層２１．２２により挟んで被覆したフラットケーブルが用いられる。シールドフラットケーブル１の少なくとも一方の端部には、図中のＺ軸方向上側にある絶縁層２２を除去してケーブル端末部（幅Ａの部分）が形成され、平形導体１１が露出されている。このケーブル端末部が、シールドフラットケーブル１をコネクタと接続した際の接続端子部となる。なお、ケーブル端末部は、端部の絶縁層２２を始めから存在させず、接続端子部となる平形導体１１を露出させて形成してもよい。 The shield flat cable 1 according to the present embodiment is composed of a plurality of flat conductors 11, insulating layers 21 and 22, ground conductors 31, and a shield layer 41. In the shield flat cable 1, for example, a plurality of flat conductors 11 having a flat cross section and extending in the X-axis direction are arranged in parallel in the Y-axis direction, and the direction orthogonal to the parallel plane (XY plane) of the flat conductor 11 (Z direction). A flat cable is used in which both sides of the above are sandwiched and covered with an insulating layer 21.22. At least one end of the shielded flat cable 1 is formed with a cable terminal portion (a portion having a width A) by removing the insulating layer 22 on the upper side in the Z-axis direction in the drawing, and the flat conductor 11 is exposed. .. This cable terminal portion serves as a connection terminal portion when the shield flat cable 1 is connected to the connector. The cable terminal portion may be formed by exposing the flat conductor 11 serving as the connection terminal portion without the insulating layer 22 at the end portion existing from the beginning.

平形導体１１の並列面（ＸＹ平面）の少なくとも最外側に位置する平形導体１１は、接地用平形導体１２として構成されており、図示しないコネクタと接続された際に、コネクタの接地用端子に接続される。接地用平形導体１２を除く中央部の平形導体１１は、信号用として用いられるが、これらの中の所定の平形導体１１は接地されるようにしてもよい。信号用の平形導体１１は、例えば、銅箔、錫メッキ軟銅箔等の金属からなり、例えば、厚さが１０μｍ～１００μｍで、幅が０.２～０.８ｍｍ程度であり、ピッチＰが０.４～２．０ｍｍの適宜の大きさで配列される。この平形導体１１の配列状態は、絶縁層２１，２２により挟まれて保持される。なお、接地用平形導体１２は、複数本の平形導体１１から構成されてもよく、また、Ｙ軸方向の幅が平形導体１１の幅よりも広く形成されていてもよい。 The flat conductor 11 located at least on the outermost side of the parallel surface (XY plane) of the flat conductor 11 is configured as a grounding flat conductor 12, and when connected to a connector (not shown), is connected to the grounding terminal of the connector. Will be done. The flat conductor 11 in the central portion excluding the flat conductor 12 for grounding is used for signals, but a predetermined flat conductor 11 among them may be grounded. The flat conductor 11 for a signal is made of a metal such as a copper foil or a tin-plated annealed copper foil, for example, has a thickness of 10 μm to 100 μm, a width of about 0.2 to 0.8 mm, and a pitch P of 0. It is arranged in an appropriate size of .4 to 2.0 mm. The arrangement state of the flat conductors 11 is sandwiched and held by the insulating layers 21 and 22. The grounding flat conductor 12 may be composed of a plurality of flat conductors 11, or may be formed so that the width in the Y-axis direction is wider than the width of the flat conductor 11.

図１（Ａ）、図１（Ｂ）に示すように、上側の絶縁層２２の上に配置されたグランド導体３１が、平形導体１１の並列面の少なくとも一方の最外側に位置する接地用平形導体１２と電気的に接続するように設けられている。このため、後述するように、接地用平形導体１２の上側の絶縁層２２は、グランド導体３１と接触する部分が除去されて露出される。本実施形態では、グランド導体３１と絶縁層２２の外周側には、シールド層４１が設けられている。このように、グランド導体３１は、一方の絶縁層２２のグランド導体３１が設けられる載置部分の並列方向外側で、接地用平形導体と電気的に接続される。なお、本発明において、外周側とは、平形導体１１を内側として、平形導体１１の並列面の上下両面の外側方向および左右端面の外側方向のいずれか一方または両方を意味している。 As shown in FIGS. 1A and 1B, the ground conductor 31 arranged on the upper insulating layer 22 is a grounding flat conductor located on the outermost side of at least one of the parallel surfaces of the flat conductor 11. It is provided so as to be electrically connected to the conductor 12. Therefore, as will be described later, the insulating layer 22 on the upper side of the grounding flat conductor 12 is exposed by removing the portion in contact with the ground conductor 31. In the present embodiment, the shield layer 41 is provided on the outer peripheral side of the ground conductor 31 and the insulating layer 22. In this way, the ground conductor 31 is electrically connected to the grounding flat conductor on the outside in the parallel direction of the mounting portion where the ground conductor 31 of one of the insulating layers 22 is provided. In the present invention, the outer peripheral side means one or both of the outer direction of both the upper and lower surfaces of the parallel surface of the flat conductor 11 and the outer direction of the left and right end faces, with the flat conductor 11 as the inside.

絶縁層２１，２２は、その内面（接合面）に接着層（図示省略）を有する。絶縁層２１，２２自体は、柔軟性に優れた一般的な樹脂フィルムが使用され、例えば、ポリエステル樹脂、ポリフェニレンサルファイド樹脂、ポリイミド樹脂等の汎用性のある樹脂フィルムを用いることができる。この樹脂フィルムの厚さとしては、９μｍ～１００μｍのものが用いられる。ポリエステル樹脂としては、ポリエチレンテレフタレート樹脂、ポリエチレンナフタレート樹脂、ポリブチレンナフタレート樹脂等の樹脂材料が挙げられる。なお、これらの樹脂フィルムのうち、電気的特性、機械的特性、コスト等の観点からは、ポリエチレンテレフタレート樹脂の使用が好ましい。 The insulating layers 21 and 22 have an adhesive layer (not shown) on the inner surface (joining surface) thereof. As the insulating layers 21 and 22 themselves, a general resin film having excellent flexibility is used, and for example, a versatile resin film such as a polyester resin, a polyphenylene sulfide resin, or a polyimide resin can be used. As the thickness of this resin film, one having a thickness of 9 μm to 100 μm is used. Examples of the polyester resin include resin materials such as polyethylene terephthalate resin, polyethylene naphthalate resin, and polybutylene naphthalate resin. Of these resin films, polyethylene terephthalate resin is preferably used from the viewpoint of electrical properties, mechanical properties, cost, and the like.

また、絶縁層２１，２２の接着層としては、樹脂材料からなるものが使用され、例えば、ポリエステル系樹脂やポリオレフィン系樹脂に難燃剤を添加した接着剤などが挙げられる。この接着層は、１０μｍ～１５０μｍの範囲の適宜の厚さで形成される。絶縁層２１，２２は、平形導体１１を挟んで接着層を向き合わせ、加熱ローラで熱を加えながら接合することにより貼り合わされ一体化される。なお、ケーブル端末部の平形導体１１の露出面とは反対側に、補強板を設けてもよい。さらに、絶縁層２１，２２は、接着層を用いずに、例えば、ポリエチレン、ポリプロピレン、ポリイミド、ポリエチレンテレフタレート、ポリエステル、あるいはポリフェニレンサルファイド等の単層の樹脂等で形成してもよい。この場合、樹脂の厚さを例えば３００μｍ程度にしてもよい。 Further, as the adhesive layer of the insulating layers 21 and 22, one made of a resin material is used, and examples thereof include an adhesive obtained by adding a flame retardant to a polyester resin or a polyolefin resin. The adhesive layer is formed with an appropriate thickness in the range of 10 μm to 150 μm. The insulating layers 21 and 22 are bonded and integrated by facing the adhesive layers with the flat conductor 11 interposed therebetween and joining them while applying heat with a heating roller. A reinforcing plate may be provided on the side of the cable terminal portion opposite to the exposed surface of the flat conductor 11. Further, the insulating layers 21 and 22 may be formed of, for example, a single-layer resin such as polyethylene, polypropylene, polyimide, polyethylene terephthalate, polyester, or polyphenylene sulfide without using an adhesive layer. In this case, the thickness of the resin may be set to, for example, about 300 μm.

グランド導体３１は、例えば、アルミニウム箔や銅箔等の金属箔に導電性接着層を有する２層構造のものなどが使用される。このグランド導体３１のケーブル端末部側の先端は、露出されている平形導体１１と電気短絡が生じない程度の距離Ｌ（０.２ｍｍ～１０ｍｍ）を隔てた後方に、端部エッジが位置するように貼り付けられる。グランド導体３１に設けた導電性接着層は、グランド導体３１と接地用平形導体１２との電気的に接続に用いられる。 As the ground conductor 31, for example, a two-layer structure having a conductive adhesive layer on a metal foil such as an aluminum foil or a copper foil is used. The tip of the ground conductor 31 on the cable end side is such that the end edge is located behind the exposed flat conductor 11 at a distance L (0.2 mm to 10 mm) that does not cause an electrical short circuit. It is pasted on. The conductive adhesive layer provided on the ground conductor 31 is used for electrically connecting the ground conductor 31 and the grounding flat conductor 12.

シールド層４１は、全体の厚みが３０μｍ程度で、絶縁層、金属層、導電性接着層の３層構造からなるもの、あるいは、金属層と導電性接着層の２層構造からなるものが用いられ、その導電性接着層を内側にしてグランド導体３１と絶縁層２２に貼付される。貼り付けの形態としては、図１（Ａ）、図１（Ｂ）に示すように、平形導体１１の露出面側の片面で、少なくとも複数の平形導体１１の配列部を覆うように設けられている。これ以外に、幅広のフィルムで片面全体覆うように設けてもよい。このように、シールド層４１の導電性接着層は、シールド層４１とグランド導体３１との電気的接続に用いられる。 The shield layer 41 has a total thickness of about 30 μm and is composed of a three-layer structure of an insulating layer, a metal layer, and a conductive adhesive layer, or a shield layer 41 having a two-layer structure of a metal layer and a conductive adhesive layer. It is attached to the ground conductor 31 and the insulating layer 22 with the conductive adhesive layer inside. As a form of pasting, as shown in FIGS. 1 (A) and 1 (B), one side of the flat conductor 11 on the exposed surface side is provided so as to cover at least the array portion of the plurality of flat conductors 11. There is. Alternatively, a wide film may be provided so as to cover the entire one side. As described above, the conductive adhesive layer of the shield layer 41 is used for electrical connection between the shield layer 41 and the ground conductor 31.

次に、本実施形態のシールドフラットケーブルの製造方法の一例について説明する。図２から図５は、それぞれ本発明の第１の実施形態に係るシールドフラットケーブルの製造過程の一例を説明するための図である。図２から図５において、それぞれ（Ａ）は上方から見た図、（Ｂ）は断面図を示し、例えば、図２（Ｂ）は、図２（Ａ）における２Ｂ－２Ｂでの断面図である。 Next, an example of the method for manufacturing the shielded flat cable of the present embodiment will be described. 2 to 5 are diagrams for explaining an example of a manufacturing process of a shielded flat cable according to the first embodiment of the present invention, respectively. 2 to 5, respectively, (A) is a view seen from above, (B) is a sectional view, and FIG. 2 (B) is, for example, a sectional view taken along line 2B-2B in FIG. 2 (A). be.

図２（Ａ）、図２（Ｂ）に示すように、複数本の平形導体１１とその外側に接地用平形導体１２を平行に並べ、その並列面の上下を、内側に接着層を設けた絶縁層２１，２２の間に挟み込み、加熱ローラで熱を加えながら接合することにより、平形導体１１の両面に絶縁層２１，２２を貼り合わされ一体化された長尺のフラットケーブルを作製する。本実施形態では、平形導体１１よりも幅の広い接地用平形導体１２をフラットケーブルの両側面側に２本ずつ設けた例を示している。なお、接地用平形導体１２は両側面側に１本ずつ設けてもよく、片方の側面側にのみ設けてもよい。 As shown in FIGS. 2A and 2B, a plurality of flat conductors 11 and grounding flat conductors 12 are arranged in parallel on the outside thereof, and adhesive layers are provided on the upper and lower sides of the parallel surfaces. By sandwiching it between the insulating layers 21 and 22 and joining them while applying heat with a heating roller, the insulating layers 21 and 22 are bonded to both sides of the flat conductor 11 to produce a long flat cable integrated. In this embodiment, an example is shown in which two grounding flat conductors 12 wider than the flat conductor 11 are provided on both side surfaces of a flat cable. The grounding flat conductor 12 may be provided one on each side surface side, or may be provided only on one side surface side.

次に、図３（Ａ）とその３Ｂ－３Ｂでの断面図である図３（Ｂ）に示すように、フラットケーブルの端子となる部分の一方の絶縁層、ここでは、上側の絶縁層２２をケーブル端末部の端子となる幅Ａだけ、例えばレーザ加工によって除去し、複数本の平形導体１１と接地用平形導体１２を露出させる。その際に、後ほどグランド導体３１と電気的に接続される接地用平形導体１２の上側の絶縁層２２の部分についても、グランド導体３１の幅よりも若干広い幅Ｂだけ余計に除去し、接地用平形導体１２についてはＡ＋Ｂの長さ分だけ露出させる。 Next, as shown in FIG. 3 (A) and FIG. 3 (B) which is a cross-sectional view taken along the line 3B-3B, one insulating layer of the portion serving as a terminal of the flat cable, here, the upper insulating layer 22 Is removed only by the width A that becomes the terminal of the cable terminal portion by, for example, laser processing, and a plurality of flat conductors 11 and a grounding flat conductor 12 are exposed. At that time, the portion of the insulating layer 22 on the upper side of the grounding flat conductor 12 electrically connected to the ground conductor 31 later is also removed by an extra width B slightly wider than the width of the ground conductor 31 for grounding. The flat conductor 12 is exposed by the length of A + B.

なお、複数本のシールドフラットケーブルを作製する場合は、製造効率を高めるために、１本目のシールドフラットケーブルの後端の端子部とこのシールドフラットケーブルに続く２本目シールドフラットケーブルの前端の端子部を同時に形成し、最後に図３（Ａ）に示す２点鎖線で示す分割線Ｃ－Ｃに沿って分割している。このため、図３（Ａ）では、複数本の平形導体１１と接地用平形導体１２の露出面はＨ形に形成される。 When manufacturing multiple shielded flat cables, in order to improve manufacturing efficiency, the terminal part at the rear end of the first shielded flat cable and the terminal part at the front end of the second shielded flat cable following this shielded flat cable. Are formed at the same time, and finally, they are divided along the dividing line CC shown by the two-dot chain line shown in FIG. 3 (A). Therefore, in FIG. 3A, the exposed surfaces of the plurality of flat conductors 11 and the grounding flat conductor 12 are formed in an H shape.

一方の絶縁層２２から所定の形状に平形導体１１を露出させる方法としては、上記のようにレーザ加工によって絶縁層２２に開口部を設ける方法の他に、予め絶縁層２２の所定位置にＨ形形状の開口部を設けておく方法でもよい。後者の場合、平形導体１１と接地用平形導体１２を絶縁層２１と開口部を設けた絶縁層２２の間に挟み込んで、フラットケーブルを作製し、その後、開口部の箇所で分離すればよい。 As a method of exposing the flat conductor 11 to a predetermined shape from one of the insulating layers 22, in addition to the method of providing an opening in the insulating layer 22 by laser processing as described above, an H-shape is formed in advance at a predetermined position of the insulating layer 22. A method of providing a shaped opening may also be used. In the latter case, the flat conductor 11 and the grounding flat conductor 12 may be sandwiched between the insulating layer 21 and the insulating layer 22 provided with the opening to form a flat cable, and then separated at the opening.

次に、図４（Ａ）とその４Ｂ－４Ｂでの断面図である図４（Ｂ）に示すように、ケーブル端末部の端子となる幅Ａの部分を残して、グランド導体３１を絶縁層２２と接地用平形導体１２の露出面に貼り付ける。グランド導体３１には、その内側に導電性接着層が設けられているため、グランド導体３１と接地用平形導体１２とが電気的に接続される。この場合、グランド導体３１と平形導体１１とが接触しないように位置決めされる。また、絶縁層２２の上面と接地用平形導体１２の露出面とは絶縁層２２の厚さだけ段差が生じることから、この段差の影響を小さくするために、接地用平形導体１２とこの接地用平形導体１２に隣接する平形導体１１との間隔を、平形導体１１間の間隔よりも予め大きくしておいてもよい。また、接地用平形導体１２の幅（Ｘ方向）を広くすることによっても、グランド導体３１と接地用平形導体１２との電気的接続を確実にすることができる。 Next, as shown in FIG. 4A and FIG. 4B which is a cross-sectional view taken along the line 4B-4B, the ground conductor 31 is provided with an insulating layer, leaving a portion having a width A which is a terminal of the cable terminal portion. It is attached to the exposed surface of 22 and the flat conductor 12 for grounding. Since the ground conductor 31 is provided with a conductive adhesive layer inside, the ground conductor 31 and the grounding flat conductor 12 are electrically connected. In this case, the ground conductor 31 and the flat conductor 11 are positioned so as not to come into contact with each other. Further, since a step is generated between the upper surface of the insulating layer 22 and the exposed surface of the grounding flat conductor 12 by the thickness of the insulating layer 22, in order to reduce the influence of this step, the grounding flat conductor 12 and the grounding flat conductor 12 are used. The distance from the flat conductor 11 adjacent to the flat conductor 12 may be made larger than the distance between the flat conductors 11 in advance. Further, by widening the width (X direction) of the grounding flat conductor 12, the electrical connection between the ground conductor 31 and the grounding flat conductor 12 can be ensured.

次に、図５（Ａ）とその５Ｂ－５Ｂでの断面図である図５（Ｂ）に示すように、シールド層４１を、ケーブル端末部の端子となる幅Ａの部分を残して、グランド導体３１と絶縁層２２の上面に、少なくとも、複数の平形導体１１の配列部を覆うように貼り付ける。本実施形態では、シールド層４１は、シールドフラットケーブル１の絶縁層２２側の片面だけに設けているが、上下面を含む全周にわたって巻き付けるようにしてもよい。その後、前後のシールドフラットケーブルを分離するために、分割線Ｃ－Ｃに沿って、フレキシブルフラットケーブルを切断する。なお、フレキシブルフラットケーブルの切断は、グランド導体３１を貼り付ける前に行ってもよい。 Next, as shown in FIG. 5A and FIG. 5B, which is a cross-sectional view taken along the line 5B-5B, the shield layer 41 is grounded, leaving a portion having a width A which is a terminal of the cable terminal portion. It is attached to the upper surfaces of the conductor 31 and the insulating layer 22 so as to cover at least the arrangement portion of the plurality of flat conductors 11. In the present embodiment, the shield layer 41 is provided only on one side of the shield flat cable 1 on the insulating layer 22 side, but it may be wound around the entire circumference including the upper and lower surfaces. Then, in order to separate the front and rear shield flat cables, the flexible flat cable is cut along the dividing line CC. The flexible flat cable may be cut before the ground conductor 31 is attached.

本実施形態では、グランド導体３１をシールドフラットケーブル端末側の絶縁層２２の外周側に設けるようにしたが、グランド導体３１をシールドフラットケーブル１の長手方向中央部分の絶縁層２２の外周側に設けるようにしてもよい。この場合、シールドフラットケーブル１の長手方向中央部分において、接地用平形導体１２を覆う絶縁層２２を除去して、接地用平形導体１２を露出させる。そして、露出した接地用平形導体１２と絶縁層２２の上にグランド導体３１を貼り、さらに、シールド層４１を貼るとよい。 In the present embodiment, the ground conductor 31 is provided on the outer peripheral side of the insulating layer 22 on the shield flat cable terminal side, but the ground conductor 31 is provided on the outer peripheral side of the insulating layer 22 in the central portion of the shield flat cable 1 in the longitudinal direction. You may do so. In this case, in the central portion of the shield flat cable 1 in the longitudinal direction, the insulating layer 22 covering the grounding flat conductor 12 is removed to expose the grounding flat conductor 12. Then, the ground conductor 31 may be attached on the exposed flat conductor 12 for grounding and the insulating layer 22, and the shield layer 41 may be further attached.

（第２の実施形態）
図６は、本発明の第２の実施形態に係るシールドフラットケーブルの概略を示す図であり、図６（Ａ）は斜視図、図６（Ｂ）は、図６（Ａ）の６Ｂ－６Ｂにおける断面図である。第１の実施形態では、グランド導体３１をシールド層４１の内側に設けているが、本実施形態で示すように、グランド導体３１をシールド層４１の外側に設けてもよい。 (Second embodiment)
6A and 6B are views showing an outline of a shielded flat cable according to a second embodiment of the present invention, FIG. 6A is a perspective view, FIG. 6B is a perspective view, and FIG. 6B is 6B-6B of FIG. 6A. It is a cross-sectional view in. In the first embodiment, the ground conductor 31 is provided inside the shield layer 41, but as shown in this embodiment, the ground conductor 31 may be provided outside the shield layer 41.

本実施形態によるシールドフラットケーブル１は、図６（Ａ）に示すように、複数本の平形導体１１、絶縁層２１，２２、グランド導体３１、および、シールド層４１から構成され、平形導体１１の並列面（ＸＹ平面）の少なくとも一方の最外側に位置する平形導体１１は、接地用平形導体１２として構成されている。シールドフラットケーブル１は、第１の実施形態と同様のフラットケーブルが用いられ、シールドフラットケーブル１の少なくとも一方の端部は、図中のＺ軸方向上側にある一方の絶縁層２２を除去して接続端子部となるケーブル端末部（幅Ａ）が形成されている。そして、一方の絶縁層２２の上側（外周側）には、シールド層４１が、少なくとも複数の平形導体１１の配列部を覆うように設けられており、さらに、シールド層４１の外周側に設けたグランド導体３１により、接地用平形導体１２とシールド層４１とが電気的に接続されている。 As shown in FIG. 6A, the shield flat cable 1 according to the present embodiment is composed of a plurality of flat conductors 11, insulating layers 21 and 22, ground conductors 31, and a shield layer 41, and is composed of the flat conductor 11. The flat conductor 11 located on the outermost side of at least one of the parallel planes (XY planes) is configured as a grounding flat conductor 12. As the shield flat cable 1, the same flat cable as in the first embodiment is used, and at least one end of the shield flat cable 1 has the insulating layer 22 on the upper side in the Z-axis direction in the drawing removed. A cable terminal portion (width A) serving as a connection terminal portion is formed. A shield layer 41 is provided on the upper side (outer peripheral side) of one of the insulating layers 22 so as to cover at least an array portion of the plurality of flat conductors 11, and is further provided on the outer peripheral side of the shield layer 41. The ground conductor 31 electrically connects the grounding flat conductor 12 and the shield layer 41.

シールド層４１を除く他の構成部材については、第１の実施形態と同じのものが用いられる。第１の実施形態におけるシールド層４１は、絶縁層、金属層、導電性接着層の３層構造からなるもの、あるいは、金属層と導電性接着層の２層構造からなるものが用いられたが、本実施形態では、絶縁層、金属層、接着層の３層構造からなるもの、あるいは、金属層、接着層の２層構造からなうものが用いられる。そして、シールド層４１とこのシールド層４１の外周側に設けられたグランド導体３１とを電気的に接続するために、シールド層４１のグランド導体３１と重なる部分に絶縁層がある場合は、この部分の樹脂層が取り除かれて、別途、導電性接着剤によって、シールド層４１の金属層とグランド導体３１とが電気的に接続される。その他の構成部材については、第１の実施形態と同じものを用いることができるので、それらの説明は省略する。 As for the other constituent members except the shield layer 41, the same members as those in the first embodiment are used. The shield layer 41 in the first embodiment has a three-layer structure of an insulating layer, a metal layer, and a conductive adhesive layer, or a two-layer structure of a metal layer and a conductive adhesive layer. In the present embodiment, a structure having a three-layer structure of an insulating layer, a metal layer, and an adhesive layer, or a structure having a two-layer structure of a metal layer and an adhesive layer is used. Then, in order to electrically connect the shield layer 41 and the ground conductor 31 provided on the outer peripheral side of the shield layer 41, if there is an insulating layer in the portion overlapping the ground conductor 31 of the shield layer 41, this portion The resin layer of the shield layer 41 is removed, and the metal layer of the shield layer 41 and the ground conductor 31 are separately electrically connected by a conductive adhesive. As for other constituent members, the same members as those in the first embodiment can be used, and thus the description thereof will be omitted.

次に、本実施形態のシールドフラットケーブル１の製造方法の一例について説明する。図７から図９は、それぞれ本発明の第１の実施形態に係るシールドフラットケーブルの製造過程の一例を説明するための図である。 Next, an example of the manufacturing method of the shielded flat cable 1 of the present embodiment will be described. 7 to 9 are diagrams for explaining an example of the manufacturing process of the shielded flat cable according to the first embodiment of the present invention, respectively.

図７（Ａ）とその７Ｂ－７Ｂ断面図である図７（Ｂ）に示すように、複数本の平形導体１１とその外側に接地用平形導体１２を平行に並べ、その並列面の上下を、内側に接着層を設けた絶縁層２１，２２の間に挟み込み、加熱ローラで熱を加えながら接合することにより、平形導体１１の両面に絶縁層２１，２２を貼り合わされ一体化された長尺のフラットケーブルを作製する。さらに、シールド層４１の接着層を絶縁層２２側に向けた状態で、少なくとも平形導体１１の外周側を覆うように貼り付ける。なお、シールド層４１の貼り付けは、フラットケーブの作成と同時に行ってもよく、絶縁層２２の全面を覆うように設けてもよい。 As shown in FIG. 7A and FIG. 7B, which is a cross-sectional view taken along the line 7B-7B, a plurality of flat conductors 11 and a grounding flat conductor 12 are arranged in parallel on the outside thereof, and the upper and lower sides of the parallel surface are arranged in parallel. The insulating layers 21 and 22 are laminated and integrated on both sides of the flat conductor 11 by sandwiching them between the insulating layers 21 and 22 having an adhesive layer inside and joining them while applying heat with a heating roller. Make a flat cable. Further, the adhesive layer of the shield layer 41 is attached so as to cover at least the outer peripheral side of the flat conductor 11 with the adhesive layer facing the insulating layer 22 side. The shield layer 41 may be attached at the same time as the flat cave is created, or may be provided so as to cover the entire surface of the insulating layer 22.

次に、図８（Ａ）とその８Ｂ－８Ｂでの断面図である図８（Ｂ）に示すように、フラットケーブルの端子となる部分の一方の絶縁層２２を、ケーブル端末部の端子となる幅Ａだけ、例えばレーザ加工によって除去し、複数本の平形導体１１と接地用平形導体１２を露出させる。その際に、接地用平形導体１２の上側の絶縁層２２の部分についても、グランド導体３１の幅よりも若干広い幅Ｂだけ余計に除去し、接地用平形導体１２についてはＡ＋Ｂの長さ分だけ露出させる。複数本の平形導体１１と接地用平形導体１２の露出面をＨ形に形成する点は、第１の実施形態と同様である。本実施形態では、平形導体１１よりも幅の広い接地用平形導体１２をフラットケーブルの両側面側に２本ずつ設けた例を示している。 Next, as shown in FIG. 8A and FIG. 8B, which is a cross-sectional view taken along the line 8B-8B, one of the insulating layers 22 of the portion to be the terminal of the flat cable is used as the terminal of the cable terminal portion. Only the width A is removed by, for example, laser processing, and a plurality of flat conductors 11 and a grounding flat conductor 12 are exposed. At that time, the portion of the insulating layer 22 on the upper side of the grounding flat conductor 12 is also removed by an extra width B slightly wider than the width of the ground conductor 31, and the grounding flat conductor 12 is only the length of A + B. Expose. The point that the exposed surfaces of the plurality of flat conductors 11 and the grounding flat conductor 12 are formed in an H shape is the same as that of the first embodiment. In this embodiment, an example is shown in which two grounding flat conductors 12 wider than the flat conductor 11 are provided on both side surfaces of a flat cable.

本実施形態においても、予め開口部を設けた絶縁層２２を用いることによって、平形導体１１と接地用平形導体１２とを露出させてもよい。この場合、予め絶縁層２２とシールド層４１とを貼り合わせた複合フィルムの所定位置にＨ形形状の開口部を設けた開口付きの複合フィルムを準備し、この複合フィルムと絶縁層２１との間に、平形導体１１と接地用平形導体１２を挟み込んで、フラットケーブルを作製し、その後、開口部の箇所で分離すればよい。 Also in this embodiment, the flat conductor 11 and the grounding flat conductor 12 may be exposed by using the insulating layer 22 having an opening in advance. In this case, a composite film having an H-shaped opening is prepared at a predetermined position of the composite film in which the insulating layer 22 and the shield layer 41 are bonded in advance, and between the composite film and the insulating layer 21. The flat conductor 11 and the grounding flat conductor 12 may be sandwiched between the two to form a flat cable, and then separated at the opening.

次に、図９（Ａ）とその９Ｂ－９Ｂでの断面図である図９（Ｂ）に示すように、グランド導体３１をケーブル端末部の端子となる幅Ａの部分を残して、シールド層４１の上面と接地用平形導体１２の露出面に貼り付ける。この場合、シールド層４１が樹脂層、金属層、接着層の３層構造の場合は、グランド導体３１を貼り付ける面の樹脂層を除去する。グランド導体３１には導電性接着層が設けられているため、グランド導体３１、シールド層４１、および、接地用平形導体１２が電気的に接続される。この場合、グランド導体３１と平形導体１１とが接触しないように位置決めされる。 Next, as shown in FIG. 9A and FIG. 9B, which is a cross-sectional view taken along the line 9B-9B, the shield layer is formed by leaving the portion of the width A of the ground conductor 31 as the terminal of the cable terminal portion. It is attached to the upper surface of 41 and the exposed surface of the grounding flat conductor 12. In this case, when the shield layer 41 has a three-layer structure of a resin layer, a metal layer, and an adhesive layer, the resin layer on the surface to which the ground conductor 31 is attached is removed. Since the ground conductor 31 is provided with a conductive adhesive layer, the ground conductor 31, the shield layer 41, and the grounding flat conductor 12 are electrically connected. In this case, the ground conductor 31 and the flat conductor 11 are positioned so as not to come into contact with each other.

また、シールド層４１の上面と接地用平形導体１２の露出面とは、絶縁層２２とシールド層４１の厚さだけ段差が生じることになる。この段差は、第１の実施形態よりも大きくなるため、この段差の影響を小さくするために、接地用平形導体１２とこの接地用平形導体１２に隣接する平形導体１１との間隔を、第１の実施形態よりもさらに大きくするようにしてもよい。 Further, a step is formed between the upper surface of the shield layer 41 and the exposed surface of the grounding flat conductor 12 by the thickness of the insulating layer 22 and the shield layer 41. Since this step is larger than that of the first embodiment, in order to reduce the influence of this step, the distance between the grounding flat conductor 12 and the flat conductor 11 adjacent to the grounding flat conductor 12 is set to the first. It may be made larger than the embodiment of.

本実施形態では、グランド導体３１をシールドフラットケーブル端末側の絶縁層２２の外周側に設けるようにしたが、グランド導体３１をシールドフラットケーブル１の長手方向中央部分の絶縁層２２の外周側に設けるようにしてもよい。この場合、シールドフラットケーブル１の長手方向中央部分において、接地用平形導体１２を覆う絶縁層２２を除去して、接地用平形導体１２を露出させる。そして、露出した接地用平形導体１２とシールド層４１の上にグランド導体３１を貼るとよい。 In the present embodiment, the ground conductor 31 is provided on the outer peripheral side of the insulating layer 22 on the shield flat cable terminal side, but the ground conductor 31 is provided on the outer peripheral side of the insulating layer 22 in the central portion of the shield flat cable 1 in the longitudinal direction. You may do so. In this case, in the central portion of the shield flat cable 1 in the longitudinal direction, the insulating layer 22 covering the grounding flat conductor 12 is removed to expose the grounding flat conductor 12. Then, the ground conductor 31 may be attached on the exposed flat conductor 12 for grounding and the shield layer 41.

（第３の実施形態）
図１０は、本発明の第３の実施形態に係るシールドフラットケーブルのグランド導体部分での断面図である。
第１、第２の実施形態では、シールド層４１は、シールドフラットケーブル１の片面側に設けているが、本実施形態で示すように、シールド層を両面に設けてもよい。この場合、図１０に示すように、グランド導体３１’を絶縁層２２側だけでなく、反対側の絶縁層２１側にも位置するように、絶縁層２１，２２の外周を取り囲むように設ける。そして、シールド層４１，４２がそれぞれ絶縁層２２，２１の外周側に設けるようにする。これによって、対ノイズ特性の向上を図ることができる。また、シールド層４１，４２を絶縁層２１，２２のそれぞれに設ける代わりに、フラットケーブルの全周を囲むように設けてもよい。 (Third embodiment)
FIG. 10 is a cross-sectional view of the ground conductor portion of the shielded flat cable according to the third embodiment of the present invention.
In the first and second embodiments, the shield layer 41 is provided on one side of the shield flat cable 1, but as shown in the present embodiment, the shield layer may be provided on both sides. In this case, as shown in FIG. 10, the ground conductor 31'is provided so as to surround the outer periphery of the insulating layers 21 and 22 so as to be located not only on the insulating layer 22 side but also on the opposite insulating layer 21 side. Then, the shield layers 41 and 42 are provided on the outer peripheral sides of the insulating layers 22 and 21, respectively. This makes it possible to improve the noise resistance characteristics. Further, instead of providing the shield layers 41 and 42 on each of the insulating layers 21 and 22, they may be provided so as to surround the entire circumference of the flat cable.

以上、各実施形態では、グランド導体３１をシールドフラットケーブルの端部に設けることによって、シールド層４１と接地用平形導体１２を電気接続したが、グランド導体３１をシールドフラットケーブルの中央部に設けることによって、シールド層４１と接地用平形導体１２を電気接続してもよい。この場合、グランド導体３１は、シールド層４１の上に設けられ、グランド導体３１を設けた箇所の接地用平形導体１２を覆う絶縁層２２が予め除去される。そして、グランド導体３１を介してシールド層４１と接地用平形導体１２が電気接続される。また、ケーブル端末部において平形導体を露出させる方法としては、絶縁層を除去する以外に、予め、平形導体を露出させる部分を除いて絶縁層を設けてもよい。 As described above, in each embodiment, the shield layer 41 and the grounding flat conductor 12 are electrically connected by providing the ground conductor 31 at the end of the shield flat cable, but the ground conductor 31 is provided at the center of the shield flat cable. The shield layer 41 and the grounding flat conductor 12 may be electrically connected. In this case, the ground conductor 31 is provided on the shield layer 41, and the insulating layer 22 covering the grounding flat conductor 12 at the location where the ground conductor 31 is provided is removed in advance. Then, the shield layer 41 and the grounding flat conductor 12 are electrically connected via the ground conductor 31. Further, as a method of exposing the flat conductor in the cable terminal portion, in addition to removing the insulating layer, an insulating layer may be provided in advance except for the portion where the flat conductor is exposed.

１…シールドフラットケーブル、１１…平形導体、１２…接地用平形導体、２１，２２…絶縁層、３１，３１'…グランド導体、４１，４２…シールド層。 1 ... Shielded flat cable, 11 ... Flat conductor, 12 ... Flat conductor for grounding, 21,22 ... Insulation layer, 31,31'... Ground conductor, 41,42 ... Shielding layer.

Claims

A plurality of signal conductors arranged in parallel, a grounding conductor adjacent to the outermost signal conductor in the parallel direction of the signal conductor, and both sides of the parallel surface of the signal conductor and the grounding conductor . It has a pair of bonded insulating layers and a shield layer that covers at least one of the insulating layers, and the signal conductor and the grounding conductor are provided from the lengthwise end portion of one of the insulating layers to a predetermined range. A shielded flat cable with an exposed cable end formed on it.
The distance from one end of the exposed range of the grounding conductor in the length direction of the insulating layer is Lb, and the distance from one end of the exposed range of the other signal conductor in the length direction of the insulating layer. When the distance is La
Lb> La
And
A ground conductor provided on the outer peripheral side of at least one of the insulating layers and extending in the width direction of the cable is in the range between the distance La and the distance Lb from the lengthwise end of the one of the insulating layers. , A shielded flat cable that is electrically connected to the grounding conductor and the shield layer.

A plurality of conductors arranged in parallel, a pair of insulating layers bonded to both sides of the parallel surfaces of the plurality of conductors, a shield layer covering at least one of the insulating layers, and at least one of the insulating layers. A shielded flat cable having a ground conductor provided on the outer peripheral side and having a cable terminal portion in which the conductor is exposed at one end in the length direction of the insulating layer.
The plurality of conductors include a plurality of signal conductors arranged in parallel, a first grounding conductor adjacent to one of the outermost signal conductors in the parallel direction of the signal conductor, and the signal conductor. It has a second grounding conductor, which is adjacent to the other of the outermost signal conductors in the parallel direction of the conductors.
The shield layer is
One side surface in the parallel direction is provided between the first grounding conductor and the one signal conductor.
The other side surface in the parallel direction is provided between the second grounding conductor and the other signal conductor.
The ground conductor is
It is electrically connected to the first grounding conductor through the first opening provided in the insulating layer.
It is electrically connected to the second grounding conductor through the second opening provided in the insulating layer.
A shielded flat cable that is electrically connected to the shield layer in a region sandwiched between the first opening and the second opening.

The shield flat cable according to claim 1 or 2 , wherein the ground conductor is provided between the insulating layer and the shield layer.

The shield flat cable according to claim 1 or 2 , wherein the ground conductor is provided in contact with the outer peripheral side of the shield layer provided on the insulating layer.

At the longitudinal end of the shielded flat cable
The insulating layer is provided with a notch in which the grounding conductor is exposed longer than the signal conductor, and a convex portion adjacent to the notch and superimposing on the signal conductor.
In the longitudinal direction of the shielded flat cable
One side surface of the ground conductor is provided along the side surface of the convex portion, and the other side surface of the ground conductor is provided along the side surface of the notch portion.
The ground conductor and the grounding conductor are electrically connected at a position where they overlap with the notch.
The shield flat cable according to any one of claims 1 to 4, wherein the ground conductor and the shield layer are electrically connected at a position where they overlap with the convex portion.

The shield flat cable according to any one of claims 1 to 5, wherein the grounding conductor is formed to have a wider width in the arrangement direction than the other signal conductors.

One of claims 1 to 6, wherein the ground conductor is provided around the pair of the insulating layers, and the shield layer is provided in contact with the ground conductor on the outer peripheral side of each of the pair of the insulating layers. Shielded flat cable according to item 1.