JP5293692B2 - Flex-rigid wiring board and manufacturing method thereof - Google Patents

Flex-rigid wiring board and manufacturing method thereof Download PDF

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JP5293692B2
JP5293692B2 JP2010147817A JP2010147817A JP5293692B2 JP 5293692 B2 JP5293692 B2 JP 5293692B2 JP 2010147817 A JP2010147817 A JP 2010147817A JP 2010147817 A JP2010147817 A JP 2010147817A JP 5293692 B2 JP5293692 B2 JP 5293692B2
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wiring board
rigid
flex
prepreg
flexible wiring
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JP2012015178A (en
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真司 真船
真介 堀
淳一 平山
守生 村田
勝 藤木
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Elna Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a flex rigid wiring substrate and a method for manufacturing the same with which a substrate having high adhesiveness among respective layers can be manufactured in a simple process and the thickness of a rigid portion can be made more uniform. <P>SOLUTION: A flex rigid wiring substrate comprises a step of heating and pressing a laminate member in which a flexible wiring substrate 10 is sandwiched through prepregs 11 from both the sides thereof by rigid wiring substrate laminate units to integrate the laminate member, and a step of forming an interlayer connection portion for conductively connecting a wiring pattern formed at an end portion 10a of the flexible wiring plate 10 to a wiring pattern of the rigid wiring substrate. In the laminate member, the prepregs 11 at both the sides for adhesively attaching the laminate units at both the sides sandwich the end portion 10a of the flexible wiring substrate 10, and other prepregs 31 sandwich the residual portion. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

本発明は、1枚の配線基板にフレックス部とリジッド部とを備えるフレックスリジッド配線基板、及びその製造方法に関するものである。   The present invention relates to a flex-rigid wiring board having a flex part and a rigid part on a single wiring board, and a manufacturing method thereof.

従来、配線基板としては、硬質のリジッド配線基板と、軟質のフレキシブル配線基板とが一般的であったが、両者の長所を備えるべく、フレックス部とリジッド部とを有するフレックスリジッド配線基板も開発が進んでいる。このフレックスリジッド配線基板は、図6(c)に示すように、部品搭載が可能で、部品重量に耐え、筐体に固定するための強度を有するリジッド部18と、自由に屈曲し、小さい空間で配線板とコネクタの間や配線板同士の間をつなぐフレックス部17とからなっている。   Conventionally, hard rigid wiring boards and soft flexible wiring boards were generally used as wiring boards, but flex rigid wiring boards having a flex part and a rigid part have also been developed in order to have the advantages of both. Progressing. As shown in FIG. 6 (c), this flex-rigid wiring board can be mounted with components, has a rigid portion 18 that can withstand the weight of the components, and has strength to be fixed to the casing, and can be freely bent to form a small space. And a flex portion 17 connecting between the wiring board and the connector or between the wiring boards.

このようなフレックスリジッド配線基板は、従来、図6に示す方法で形成されていた。まず、図6(a)に示すように、予めプリント配線の施されたフレキシブル配線板10の両面(又は片面)に、絶縁と接着とを兼ねた半硬化のプリプレグ11を載せる。このとき、フレックス部17となる部分には空隙部15が形成される。前記プリプレグ11の上には、さらにリジッド部18のプリント配線を形成する銅箔12が載せられる。さらに、厚手の離型フィルム13を被せて上下の鏡面板14でプレスしつつ加熱する。   Such a flex-rigid wiring board has been conventionally formed by the method shown in FIG. First, as shown to Fig.6 (a), the semi-hardened prepreg 11 which served as both insulation and adhesion | attachment is mounted on the both surfaces (or one side) of the flexible wiring board 10 to which the printed wiring was given previously. At this time, a gap portion 15 is formed in a portion that becomes the flex portion 17. On the prepreg 11, a copper foil 12 that forms a printed wiring of the rigid portion 18 is further placed. Furthermore, it heats, covering with the thick release film 13 and pressing with the up-and-down mirror plate 14.

図6(b)に示すように、プリプレグ11は、ガラス繊維からなる補強材に、熱硬化樹脂と硬化剤との混合したものを塗布して半硬化状態(B−stage)に形成したものであり、プレスしつつ加熱すると、プリプレグ11の内部で樹脂と硬化剤とが反応して一時的に柔らかになった後に硬化して、フレキシブル配線板10と銅箔12とを接続する接着剤として作用すると共に、絶縁層となる。   As shown in FIG. 6B, the prepreg 11 is formed in a semi-cured state (B-stage) by applying a mixture of a thermosetting resin and a curing agent to a reinforcing material made of glass fiber. Yes, when heated while pressing, the resin and the curing agent react inside the prepreg 11 to be temporarily softened and then cured to act as an adhesive for connecting the flexible wiring board 10 and the copper foil 12. And an insulating layer.

図6(c)に示すように、プリプレグ11の硬化後に、鏡面板14と離型フィルム13を除くと、フレックス部17に樹脂が流れ出た状態でしみ出し部16が形成されたフレックスリジッド配線基板となる。また、プリプレグ11の流動を抑制するため、従来は、流動の少ない、ローフローなプリプレグが使用されていた。   As shown in FIG. 6C, after the prepreg 11 is cured, a flex-rigid wiring board in which the exudation portion 16 is formed in a state where the resin flows out to the flex portion 17 when the mirror plate 14 and the release film 13 are removed. It becomes. Moreover, in order to suppress the flow of the prepreg 11, conventionally, a low-flow prepreg having a low flow has been used.

しかし、従来のフレックスリジッド配線基板の製造方法では、フレキシブル配線板が、配線基板の全面に配設されるため、高価なフレキシブル配線板の使用量が多くコストが高くなり、また、フレキシブル配線板の材料は、リジッド部の他の材料と通常種類が異なるため、基板のインピーダンス制御が難しく、また熱膨張率の相違による変形や剥離の問題が生じ易く、配線基板の信頼性が低下していた。   However, in the conventional manufacturing method of the flex-rigid wiring board, since the flexible wiring board is disposed on the entire surface of the wiring board, the amount of expensive flexible wiring board used is large and the cost is high. Since the material is usually different from other materials of the rigid part, it is difficult to control the impedance of the substrate, and the problem of deformation and peeling due to the difference in thermal expansion coefficient is likely to occur, and the reliability of the wiring substrate is lowered.

この問題を解消する目的で、フレックスリジッド配線基板のフレックス部を構成するフレキシブル配線板に対し、その端部のみがリジッド部の絶縁層に挟持され、端部に形成された配線パターンに対してリジッド部の配線パターンが層間接続部で導電接続された構造も提案されている(例えば特許文献1参照)。このフレックスリジッド配線基板の製造方法では、プリプレグを介してリジッド配線基板の積層単位でフレキシブル配線板を両側から挟み込んだ積層物を加熱加圧して一体化させる際に、積層物がフレキシブル配線板の端部のみを挟み込むように配置する方法が採用されている。   For the purpose of solving this problem, only the end of the flexible wiring board constituting the flex part of the flex-rigid wiring board is sandwiched between the insulating layers of the rigid part, and the wiring pattern formed at the end is rigid. There has also been proposed a structure in which the wiring pattern of the part is conductively connected at the interlayer connection part (see, for example, Patent Document 1). In this flex-rigid wiring board manufacturing method, when a laminate in which a flexible wiring board is sandwiched from both sides via a prepreg is integrated by heating and pressurizing, the laminate is attached to the end of the flexible wiring board. The method of arrange | positioning so that only a part may be inserted | pinched is employ | adopted.

しかしながら、この製造方法では、リジッド部を形成するプリプレグに、フレキシブル配線板の端部のみが挟持されるため、端部が挟持された部分が他の部分より厚くなり易く、リジッド部の厚みを一定にするのが困難になるという問題があった。   However, in this manufacturing method, since only the end portion of the flexible wiring board is sandwiched between the prepregs forming the rigid portion, the portion where the end portion is sandwiched is likely to be thicker than the other portions, and the thickness of the rigid portion is constant. There was a problem that it was difficult to make.

また、特許文献2には、フレキシブル配線板の端部がリジッド部の絶縁層に挟持されたフレックスリジッド配線基板を製造する際に、フレキシブル配線板の端部に隣接して非可撓性基材を配置した状態で、その両側に絶縁層を形成し、順次配線層と絶縁層とをビア接続を行いながら形成する方法が開示されている。   In addition, in Patent Document 2, when manufacturing a flex-rigid wiring board in which an end portion of a flexible wiring board is sandwiched between insulating layers of a rigid portion, an inflexible base material is adjacent to the end portion of the flexible wiring board. In this state, an insulating layer is formed on both sides of the wiring layer, and a wiring layer and an insulating layer are sequentially formed while performing via connection.

しかし、この製法では、絶縁層に挟持されたフレキシブル配線板のハンドリングが問題となるため、通常のリジッド配線基板の製法によってリジッド部を形成するのが困難となり、一旦、全体をリジッドな状態で形成したのち、フレキシブル配線板に積層された部分を除去する工程を採用するなど、製造工程が複雑になるという問題があった。また、ガラスエポキシ樹脂等の非可撓性基材(硬化物)を使用するため、隣接するフレキシブル配線板の端辺との間隙などに樹脂が充填されにくくなり、強度や密着性が低下するという問題があった。   However, in this manufacturing method, handling of the flexible wiring board sandwiched between the insulating layers becomes a problem, so it becomes difficult to form the rigid portion by the normal manufacturing method of the rigid wiring board, and once the entire is formed in a rigid state. After that, there is a problem that the manufacturing process becomes complicated, such as adopting a process of removing a portion laminated on the flexible wiring board. In addition, since a non-flexible base material (cured product) such as glass epoxy resin is used, it becomes difficult for the resin to be filled in the gap between the ends of the adjacent flexible wiring boards, and the strength and adhesion are reduced. There was a problem.

特開2006−294666号公報JP 2006-294666 A 国際特開WO2008−050399号公報International Patent Publication WO2008-050399

そこで、本発明の目的は、各層の密着性の高い基板を簡易な工程で製造でき、しかもリジッド部の厚みをより均一にすることができるフレックスリジッド配線基板、及びその製造方法を提供することにある。   Accordingly, an object of the present invention is to provide a flex-rigid wiring board capable of manufacturing a substrate with high adhesion of each layer by a simple process and making the thickness of the rigid portion more uniform, and a method for manufacturing the same. is there.

上記目的は、下記の如き本発明により達成できる。
即ち、本発明のフレックスリジッド配線基板の製造方法は、プリプレグを介してリジッド配線基板の積層単位でフレキシブル配線板を両側から挟み込んだ積層物を加熱加圧して一体化させる工程と、前記フレキシブル配線板の端部に形成された配線パターンと前記リジッド配線基板の配線パターンとを導電接続する層間接続部を形成する工程とを含むフレックスリジッド配線基板の製造方法であって、前記積層物は、前記両側の積層単位を接着するための両側のプリプレグが、前記フレキシブル配線板の端部を挟み込むと共に、残りの部分には別のプリプレグを挟み込んだものであることを特徴とする。
The above object can be achieved by the present invention as described below.
That is, the method for manufacturing a flex-rigid wiring board according to the present invention includes a step of heating and pressing a laminate in which a flexible wiring board is sandwiched from both sides via a prepreg in a unit of lamination of the rigid wiring board, and the flexible wiring board. A method of manufacturing a flex-rigid wiring board, including a step of forming an interlayer connection portion for conductively connecting the wiring pattern formed at the end of the wiring pattern and the wiring pattern of the rigid wiring board, wherein the laminate includes the both sides The prepregs on both sides for adhering the laminated unit are sandwiched between the end portions of the flexible wiring board and another prepreg is sandwiched between the remaining portions.

本発明の製造方法によると、前記両側の積層単位を接着するための両側のプリプレグが、前記フレキシブル配線板の端部を挟み込むと共に、残りの部分には別のプリプレグを挟み込んだ構造となるため、端部のみを挟持する場合と比較して、別のプリプレグの存在により、リジッド部の厚みを均一にし易くなる。その際、硬化物ではなくプリプレグを使用するため、フレキシブル配線板の端辺との間隙などに樹脂が充填され易くなり、強度や密着性を向上させることができる。また、プリプレグを介してリジッド配線基板の積層単位でフレキシブル配線板を両側から挟み込んだ積層物を加熱加圧して一体化させる工程によりフレックス部とリジッド部とを形成できるため、簡易な工程でフレックスリジッド配線基板を製造できる。その結果、各層の密着性の高い基板を簡易な工程で製造でき、しかもリジッド部の厚みをより均一にすることができるフレックスリジッド配線基板の製造方法を提供することができる。   According to the manufacturing method of the present invention, the prepregs on both sides for adhering the laminated units on both sides sandwich the end of the flexible wiring board, and the remaining part has a structure in which another prepreg is sandwiched. Compared with the case where only the end portion is sandwiched, the presence of another prepreg makes it easy to make the thickness of the rigid portion uniform. At that time, since a prepreg is used instead of a cured product, the resin is easily filled in the gap between the end of the flexible wiring board and the like, and the strength and adhesion can be improved. In addition, the flex part and the rigid part can be formed by a process of heating and pressurizing and integrating the laminate in which the flexible wiring board is sandwiched from both sides in a laminate unit of the rigid wiring board through the prepreg, so that the flex rigid A wiring board can be manufactured. As a result, it is possible to provide a method for manufacturing a flex-rigid wiring board in which a substrate with high adhesion between layers can be manufactured by a simple process and the thickness of the rigid portion can be made more uniform.

上記において、前記別のプリプレグは、前記フレキシブル配線板の端部を配置するための切欠き部又はくり抜き部を有することが好ましい。これにより、フレキシブル配線板の端部の周囲の段差を小さくすることができ、リジッド部の全面で厚みを均一化することができる。特に、前記別のプリプレグがくり抜き部を有し、このくり抜き部にフレキシブル配線板が配置される場合、リジッド部の端辺に沿って前記別のプリプレグの端辺を配置する場合に比べて、樹脂流れの影響が少なくなるため、リジッド部の全面で厚みをより均一化することができる。   In the above, it is preferable that the another prepreg has a cutout portion or a cutout portion for disposing an end portion of the flexible wiring board. Thereby, the level | step difference around the edge part of a flexible wiring board can be made small, and thickness can be equalized in the whole surface of a rigid part. In particular, when the other prepreg has a cut-out portion, and a flexible wiring board is arranged in the cut-out portion, the resin is more in comparison with the case where the end side of the other prepreg is arranged along the end side of the rigid portion. Since the influence of the flow is reduced, the thickness can be made more uniform over the entire surface of the rigid portion.

また、前記別のプリプレグは、前記両側のプリプレグより加熱加圧時の温度での流動性が高いものであることが好ましい。このように流動性が高いプリプレグを使用することにより、樹脂の充填や進入が改善されることで、各層の密着性をより向上させることができる。   Moreover, it is preferable that said another prepreg is a thing with the fluidity | liquidity in the temperature at the time of heating-pressing is higher than the prepreg of the both sides. Thus, by using a prepreg having high fluidity, the filling and entering of the resin are improved, whereby the adhesion of each layer can be further improved.

更に、前記別のプリプレグは、前記フレキシブル配線板と略同じ厚さ又は若干薄い厚さを有していることが好ましい。これにより、リジッド部の厚みをより確実に均一にすることができる。   Furthermore, it is preferable that the other prepreg has substantially the same thickness as the flexible wiring board or a slightly thinner thickness. Thereby, the thickness of a rigid part can be made uniform more reliably.

一方、本発明のフレックスリジッド配線基板は、フレキシブル配線板で構成されるフレックス部と、このフレックス部に接続されたリジッド配線基板からなるリジッド部とを備えるフレックスリジッド配線基板であって、前記リジッド部は前記フレキシブル配線板の端部を挟持した絶縁層を備えると共に、その絶縁層は、前記端部を挟持しない部分に前記フレキシブル配線板の厚みと略同じ厚さ又は若干薄い厚さを有する中間層を有し、その中間層はプリプレグが硬化して両側の絶縁層と一体化したものであり、前記フレキシブル配線板の端部に形成された配線パターンと前記リジッド配線基板の配線パターンとを導電接続する層間接続部を有することを特徴とする。   On the other hand, the flex-rigid wiring board of the present invention is a flex-rigid wiring board comprising a flex part constituted by a flexible wiring board and a rigid part made of a rigid wiring board connected to the flex part, and the rigid part Includes an insulating layer that sandwiches the end portion of the flexible wiring board, and the insulating layer has an intermediate layer having a thickness that is substantially the same as or slightly thinner than the thickness of the flexible wiring board in a portion that does not sandwich the end portion. The intermediate layer is formed by integrating the insulating layer on both sides by curing the prepreg, and electrically connecting the wiring pattern formed at the end of the flexible wiring board and the wiring pattern of the rigid wiring board. It has the interlayer connection part to perform.

本発明のフレックスリジッド配線基板によると、フレキシブル配線板の端部を挟持した絶縁層が、前記端部を挟持しない部分に前記フレキシブル配線板の厚みと略同じ厚さ又は若干薄い厚さを有する中間層を有するため、中間層を有しない場合と比較して、リジッド部の厚みを均一にし易くなる。その際、中間層がプリプレグを硬化させて両側の絶縁層と一体化したものであるため、フレキシブル配線板の端辺との間隙などに樹脂が充填され易くなり、強度や密着性を向上させることができる。また、プリプレグを介してリジッド配線基板の積層単位でフレキシブル配線板を両側から挟み込んだ積層物を加熱加圧して一体化させる工程によりフレックス部とリジッド部とを形成できるため、簡易な工程でフレックスリジッド配線基板を製造できる。その結果、各層の密着性の高い基板を簡易な工程で製造でき、しかもリジッド部の厚みをより均一にすることができるフレックスリジッド配線基板を提供することができる。   According to the flex-rigid wiring board of the present invention, the insulating layer sandwiching the end portion of the flexible wiring board has an intermediate thickness that is substantially the same as or slightly thinner than the thickness of the flexible wiring board in the portion that does not sandwich the end portion. Since it has a layer, it becomes easy to make the thickness of a rigid part uniform compared with the case where it does not have an intermediate layer. At that time, since the intermediate layer is formed by curing the prepreg and integrated with the insulating layers on both sides, the gap between the flexible wiring board and the end of the flexible wiring board can be easily filled with resin, and the strength and adhesion can be improved. Can do. In addition, the flex part and the rigid part can be formed by a process of heating and pressurizing and integrating the laminate in which the flexible wiring board is sandwiched from both sides in a laminate unit of the rigid wiring board through the prepreg, so that the flex rigid A wiring board can be manufactured. As a result, it is possible to provide a flex-rigid wiring board in which a substrate with high adhesion between layers can be manufactured by a simple process and the thickness of the rigid portion can be made more uniform.

上記において、前記中間層は、前記フレキシブル配線板の端部が配置された切欠き部を有することが好ましい。これにより、フレキシブル配線板の端部の周囲の段差を小さくすることができ、リジッド部の全面で厚みを均一化することができる。   In the above, it is preferable that the said intermediate | middle layer has a notch part by which the edge part of the said flexible wiring board is arrange | positioned. Thereby, the level | step difference around the edge part of a flexible wiring board can be made small, and thickness can be equalized in the whole surface of a rigid part.

また、前記中間層は、前記端部を挟持した絶縁層の形成に用いられたプリプレグよりも、流動性が高いプリプレグを用いて形成したものであることが好ましい。このように流動性が高いプリプレグを使用することにより、樹脂の充填や進入が改善されることで、各層の密着性をより向上させることができる。   Moreover, it is preferable that the said intermediate | middle layer is formed using the prepreg whose fluidity is higher than the prepreg used for formation of the insulating layer which pinched | interposed the said edge part. Thus, by using a prepreg having high fluidity, the filling and entering of the resin are improved, whereby the adhesion of each layer can be further improved.

本発明のフレックスリジッド配線基板の製造方法の一例を示す工程図Process drawing which shows an example of the manufacturing method of the flex-rigid wiring board of this invention 本発明のフレックスリジッド配線基板の製造方法の一例を示す工程図Process drawing which shows an example of the manufacturing method of the flex-rigid wiring board of this invention 本発明のフレックスリジッド配線基板の製造方法の他の例を示す工程図Process drawing which shows the other example of the manufacturing method of the flex-rigid wiring board of this invention 本発明のフレックスリジッド配線基板の他の例を示す断面図Sectional drawing which shows the other example of the flex-rigid wiring board of this invention 本発明のフレックスリジッド配線基板の製造方法の他の例を示す工程図Process drawing which shows the other example of the manufacturing method of the flex-rigid wiring board of this invention 従来のフレックスリジッド配線基板の製造方法を示す工程図Process diagram showing a conventional flex-rigid wiring board manufacturing method

以下、本発明の実施の形態について、図面を参照しながら説明する。まず、本発明のフレックスリジッド配線基板について説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the flex-rigid wiring board of the present invention will be described.

本発明のフレックスリジッド配線基板は、図2(b)に示すように、フレキシブル配線板10で構成されるフレックス部17と、このフレックス部17に接続されたリジッド配線基板からなるリジッド部18とを備える。   As shown in FIG. 2 (b), the flex-rigid wiring board of the present invention includes a flex part 17 composed of a flexible wiring board 10 and a rigid part 18 composed of a rigid wiring board connected to the flex part 17. Prepare.

フレキシブル配線板10は、フレキシブルな絶縁基材の片面又は両面に配線パターン(図示省略)を形成したものである。絶縁基材としては、例えばポリイミドフィルムやポリエステルフィルム等が使用される。配線パターンの表面には、必要に応じてカバーレイが設けられる。   The flexible wiring board 10 has a wiring pattern (not shown) formed on one side or both sides of a flexible insulating base. As the insulating substrate, for example, a polyimide film or a polyester film is used. A coverlay is provided on the surface of the wiring pattern as necessary.

リジッド配線基板は、より剛性の高い配線基板であり、プリプレグ11等の硬化物などからなる絶縁層34と、絶縁層19と、配線パターン23a等からなる配線層とで構成される。リジッド配線基板が多層配線基板である場合、絶縁層と配線層とが複数層設けられる。本実施形態では、リジッド配線基板が4層の配線層を有する例を示す。   The rigid wiring board is a wiring board having higher rigidity, and includes an insulating layer 34 made of a cured material such as a prepreg 11, an insulating layer 19, and a wiring layer made of a wiring pattern 23 a and the like. When the rigid wiring board is a multilayer wiring board, a plurality of insulating layers and wiring layers are provided. In the present embodiment, an example in which a rigid wiring board has four wiring layers is shown.

本発明では、図2(b)に示すように、リジッド部18はフレキシブル配線板10の端部10aを挟持した絶縁層34を備える。絶縁層34は、端部10aを挟持しない部分にフレキシブル配線板10の厚みと略同じ厚さ又は若干薄い厚さを有する中間層33を有し、その中間層33はプリプレグ31が硬化して両側の絶縁層32と一体化したものである。この絶縁層32は、プリプレグ11の硬化物で構成されている。   In the present invention, as shown in FIG. 2B, the rigid portion 18 includes an insulating layer 34 that sandwiches the end portion 10 a of the flexible wiring board 10. The insulating layer 34 has an intermediate layer 33 having a thickness substantially the same as or slightly thinner than the thickness of the flexible wiring board 10 at a portion where the end portion 10a is not sandwiched, and the intermediate layer 33 is formed on both sides of the prepreg 31 by curing. The insulating layer 32 is integrated. The insulating layer 32 is composed of a cured product of the prepreg 11.

フレキシブル配線板10の端部10aは、幅3〜30mmの領域が挟持されるのが好ましく、幅5〜10mmの領域が挟持されるのがより好ましい。挟持される端部10aの幅が3mm未満では、接続の強度が不十分となり、また、層間接続部を形成するのが困難になる傾向がある。逆に、挟持される端部10aの幅が30mmを超えると、高価なフレキシブル配線板10の使用量が多くコストが高くなり、また、熱膨張率の相違による変形や剥離の問題が生じ易くなる傾向がある。   The end portion 10a of the flexible wiring board 10 is preferably sandwiched in a region having a width of 3 to 30 mm, and more preferably a region having a width of 5 to 10 mm. If the width of the end 10a to be sandwiched is less than 3 mm, the connection strength is insufficient, and it is difficult to form an interlayer connection. Conversely, if the width of the sandwiched end portion 10a exceeds 30 mm, the amount of the expensive flexible wiring board 10 used is increased and the cost is increased, and the problem of deformation and peeling due to the difference in thermal expansion coefficient is likely to occur. Tend.

また、フレキシブル配線板10の厚みは、10〜250μmが好ましい。フレキシブル配線板10の厚みが10μm未満であると、フレックス部17の強度や耐久性が不十分となる傾向があり、厚みが250μmを超えると、フレキシブル配線板10を挟持しない部分との厚みの差が生じて、密着不良やクラックの発生が生じ易くなる傾向がある。   Further, the thickness of the flexible wiring board 10 is preferably 10 to 250 μm. If the thickness of the flexible wiring board 10 is less than 10 μm, the strength and durability of the flex portion 17 tend to be insufficient, and if the thickness exceeds 250 μm, the difference in thickness from the portion where the flexible wiring board 10 is not sandwiched. This tends to cause poor adhesion and generation of cracks.

絶縁層34の中間層33の厚みは、フレキシブル配線板10の厚みと略同じ厚さ又は若干薄い厚さであり、フレキシブル配線板10の厚み+10%〜−20%の厚みであることが好ましく、+5%〜−5%の厚みであることがより好ましい。   The thickness of the intermediate layer 33 of the insulating layer 34 is substantially the same as or slightly thinner than the thickness of the flexible wiring board 10, and is preferably a thickness of the flexible wiring board 10 + 10% to −20%. More preferably, the thickness is + 5% to −5%.

本発明では、フレキシブル配線板10の幅(図2では紙面に垂直な方向の幅)が、リジッド部18の幅と同じであってもよく、異なっていてもよい。フレキシブル配線板10の幅がリジッド部18の幅より小さい場合には、中間層33がフレキシブル配線板10の端部10aが配置された切欠き部を有することが好ましい。   In the present invention, the width of the flexible wiring board 10 (the width in the direction perpendicular to the paper surface in FIG. 2) may be the same as or different from the width of the rigid portion 18. When the width of the flexible wiring board 10 is smaller than the width of the rigid portion 18, it is preferable that the intermediate layer 33 has a notch portion in which the end portion 10 a of the flexible wiring board 10 is disposed.

また、絶縁層34の中間層33は、端部10aを挟持した両側の絶縁層32の形成に用いられたプリプレグ11よりも、流動性が高いプリプレグ31を用いて形成することが好ましい。プリプレグ11は、フレックス部17側への樹脂の滲みだしを少なくするために、ローフロータイプが好ましいが、プリプレグ31は、その必要がないため、より流動性が高い通常のプリプレグを用いるのが好ましい。   The intermediate layer 33 of the insulating layer 34 is preferably formed using a prepreg 31 having higher fluidity than the prepreg 11 used for forming the insulating layers 32 on both sides sandwiching the end 10a. The prepreg 11 is preferably a low-flow type in order to reduce the bleeding of the resin toward the flex portion 17 side. However, since the prepreg 31 is not necessary, it is preferable to use a normal prepreg having higher fluidity. .

本発明のフレックスリジッド配線基板は、フレキシブル配線板10の端部10aに形成された配線パターンに対してリジッド部18の配線パターン23aが層間接続部で導電接続されている。本実施形態では、図2(b)に示すように、層間接続部がスルーホールメッキ22により形成されている例を示す。   In the flex-rigid wiring board of the present invention, the wiring pattern 23a of the rigid portion 18 is conductively connected at the interlayer connection portion to the wiring pattern formed on the end portion 10a of the flexible wiring board 10. In the present embodiment, as shown in FIG. 2B, an example in which the interlayer connection portion is formed by through-hole plating 22 is shown.

次に、本発明の製造方法について説明するが、本発明のフレックスリジッド配線基板は、以下で述べる本発明の製造方法により好適に製造することができる。   Next, although the manufacturing method of this invention is demonstrated, the flex-rigid wiring board of this invention can be suitably manufactured with the manufacturing method of this invention described below.

本発明の製造方法は、図1(a)〜(d)に示すように、プリプレグ11を介して、リジッド配線基板の積層単位でフレキシブル配線板10を両側から挟み込んだ積層物を加熱加圧して一体化させる工程を含むものである。本実施形態では、リジッド配線基板の積層単位として、2枚の両面配線基板の前躯体PW(片面のみパターン形成したもの)を用いる例を示す。   As shown in FIGS. 1A to 1D, the manufacturing method of the present invention heats and pressurizes a laminate in which a flexible wiring board 10 is sandwiched from both sides via a prepreg 11 in a laminate unit of a rigid wiring board. The process of integrating is included. In this embodiment, an example is shown in which a precursor PW (patterned on only one side) of two double-sided wiring boards is used as a laminate unit of rigid wiring boards.

本実施形態では、まず、図1(a)に示すように、絶縁層19の両面に銅箔12が積層一体化され、銅箔12同士が層間接続部で導電接続された両面銅張積層板を準備する。層間接続部は、例えば導電性ペーストなどで形成することができ、予めレーザ加工等により半硬化した絶縁層19に開孔を形成し、開孔に導電性ペーストを充填した後、銅箔12を加熱加圧して積層一体化することで、上記の両面銅張積層板を製造できる。その他、層間接続部をスルーホールメッキやレーザビア、フィルドビアなどで形成することも可能である。   In this embodiment, first, as shown in FIG. 1A, a double-sided copper-clad laminate in which copper foils 12 are laminated and integrated on both surfaces of an insulating layer 19 and the copper foils 12 are conductively connected to each other at an interlayer connection portion. Prepare. The interlayer connection portion can be formed with, for example, a conductive paste, and after opening an opening in the semi-cured insulating layer 19 by laser processing or the like and filling the opening with the conductive paste, the copper foil 12 is formed. The above double-sided copper-clad laminate can be manufactured by stacking and integrating by heating and pressing. In addition, the interlayer connection portion can be formed by through-hole plating, laser via, filled via, or the like.

次に、図1(b)に示すように、フレックス部17を形成する部分の両面銅張積層板を、くり抜き加工し、また、必要に応じてリジッド部18の外形加工を行う。これらの加工は、ルータ等を用いて行うことができる。なお、図1(d’)には、両面銅張積層板をくり抜き加工した状態の平面図が示されている。   Next, as shown in FIG. 1 (b), the double-sided copper clad laminate at the portion where the flex portion 17 is formed is cut out, and the outer shape of the rigid portion 18 is processed as necessary. These processes can be performed using a router or the like. FIG. 1 (d ′) shows a plan view of a state in which a double-sided copper-clad laminate has been cut out.

次いで、図1(c)に示すように、一方の銅箔12をエッチング等して、配線パターン12aを形成し、両面配線基板の前躯体PWを作成する。エッチングは、所定のパターンを有するエッチングレジストを形成した後に行うことができる。   Next, as shown in FIG. 1C, one copper foil 12 is etched or the like to form a wiring pattern 12a, thereby creating a precursor PW of a double-sided wiring board. Etching can be performed after forming an etching resist having a predetermined pattern.

次いで、図1(d)および(d’)に示すように、上記の配線パターン12a同士が向かい合うように、プリプレグ11を介して、リジッド配線基板の積層単位でフレキシブル配線板10を両側から挟み込んだ積層物とする。その際、本発明では、両側の積層単位を接着するための両側のプリプレグ11が、フレキシブル配線板10の端部10aを挟み込むと共に、残りの部分には別のプリプレグ31を挟み込んだ積層物とする。本実施形態では、図1(d’)に示すように、別のプリプレグ31が、両面銅張積層板のくり抜き部と略同じ形状のくり抜き部を有する例を示す。この例では、最終的にリジッド部18が切断線Cで切断され、2つのリジッド部18がフレックス部17の両側に形成される。このように、別のプリプレグ31がくり抜き部を有し、このくり抜き部にフレキシブル配線板10が配置される場合、リジッド部18の端辺に沿って別のプリプレグ31の端辺を配置する場合(図5(a)参照)に比べて、樹脂流れの影響が少なくなるため、リジッド部18の全面で厚みをより均一化することができる。   Next, as shown in FIGS. 1D and 1D ′, the flexible wiring board 10 is sandwiched from both sides through the prepreg 11 so that the wiring patterns 12a face each other, with the rigid wiring board laminated unit. Let it be a laminate. At that time, in the present invention, the prepregs 11 on both sides for bonding the laminated units on both sides sandwich the end 10a of the flexible wiring board 10, and the other part is a laminate having another prepreg 31 sandwiched therebetween. . In the present embodiment, as shown in FIG. 1 (d), an example in which another prepreg 31 has a cutout portion having substantially the same shape as a cutout portion of a double-sided copper-clad laminate. In this example, the rigid portion 18 is finally cut along the cutting line C, and the two rigid portions 18 are formed on both sides of the flex portion 17. Thus, when another prepreg 31 has a cut-out portion and the flexible wiring board 10 is disposed in this cut-out portion, the end side of another prepreg 31 is disposed along the end side of the rigid portion 18 ( Compared with FIG. 5A, the influence of the resin flow is reduced, so that the thickness of the entire rigid portion 18 can be made more uniform.

別のプリプレグ31は、フレキシブル配線板10と略同じ厚さ又は若干薄い厚さを有していることが好ましい。具体的には、別のプリプレグ31の厚みが、フレキシブル配線板10の厚み+10%〜−20%の厚みであることが好ましく、+5%〜−5%の厚みであることがより好ましい。   The other prepreg 31 preferably has substantially the same thickness as the flexible wiring board 10 or a slightly thinner thickness. Specifically, the thickness of another prepreg 31 is preferably the thickness of the flexible wiring board 10 + 10% to −20%, and more preferably + 5% to −5%.

プリプレグ11は、絶縁と接着とを兼ねた半硬化状態の樹脂を含むものであり、一般的に、ガラス繊維などからなる補強材に、エポキシ樹脂等の熱硬化樹脂と硬化剤との混合したものを塗布して半硬化状態(B−stage)に形成したものである。別のプリプレグ31は、プリプレグ11と同じ材質のものを使用してもよいが、別のプリプレグ31は、両側のプリプレグ11より加熱加圧時の温度での流動性が高いことが好ましい。具体的には、プリプレグ11としてローフロータイプを使用し、プリプレグ31として、より流動性が高い通常のプリプレグを用いるのが好ましい。   The prepreg 11 includes a semi-cured resin that serves as both insulation and adhesion, and is generally a mixture of a thermosetting resin such as an epoxy resin and a curing agent in a reinforcing material made of glass fiber or the like. Is applied to form a semi-cured state (B-stage). Another prepreg 31 may be made of the same material as that of the prepreg 11, but the other prepreg 31 preferably has higher fluidity at the temperature at the time of heating and pressurization than the prepregs 11 on both sides. Specifically, it is preferable to use a low flow type as the prepreg 11 and use a normal prepreg having higher fluidity as the prepreg 31.

積層する際、例えば、下部の鏡面板の上に、離型フィルムを介して、上記積層物を載置する。その上に、離型フィルムを介して、上部の鏡面板を載せて、加熱加圧することで、積層物を一体化させることが好ましい。   When laminating, for example, the laminate is placed on a lower mirror plate via a release film. It is preferable that the laminate is integrated by placing an upper mirror plate on the release film and heating and pressurizing it.

プリプレグ11と別のプリプレグ31は、加熱されると、内部で樹脂と硬化剤とが反応して樹脂部分が一時的に柔らかになった後、硬化して、フレキシブル配線板10と両面配線基板の前躯体PWとを接続する接着剤として作用すると共に、リジッド配線基板の絶縁層34となる。   When the prepreg 11 and the other prepreg 31 are heated, the resin and the curing agent react with each other inside to temporarily soften the resin portion and then harden, so that the flexible wiring board 10 and the double-sided wiring board While acting as an adhesive to connect the precursor PW, it becomes the insulating layer 34 of the rigid wiring board.

加熱加圧の条件は、プリプレグ11等を形成する樹脂や硬化剤の量、種類などにもよるが、エポキシ樹脂を使用した場合、温度が150〜350℃、好ましくは、170〜300℃とするのがよい。   The heating and pressing conditions depend on the amount of resin and the curing agent forming the prepreg 11, etc., and the type, but when an epoxy resin is used, the temperature is 150 to 350 ° C., preferably 170 to 300 ° C. It is good.

本発明では、図2(a)〜(b)に示すように、フレキシブル配線板10の端部10aに形成された配線パターンと、リジッド配線基板(リジッド部18)の配線パターンとを導電接続する層間接続部を形成する工程を含む。この工程としては、前記一体化を行った後、スルーホールメッキ22又はレーザビアによって、端部10aに形成された配線パターンに対してリジッド部18の配線パターン23を導電接続することが好ましい。本実施形態では、スルーホールメッキ22により層間接続部を形成する例を示す。   In the present invention, as shown in FIGS. 2A and 2B, the wiring pattern formed on the end portion 10a of the flexible wiring board 10 and the wiring pattern of the rigid wiring substrate (rigid portion 18) are conductively connected. Forming an interlayer connection. In this step, after the integration, the wiring pattern 23 of the rigid portion 18 is preferably conductively connected to the wiring pattern formed on the end portion 10a by the through-hole plating 22 or the laser via. In the present embodiment, an example in which an interlayer connection portion is formed by through-hole plating 22 is shown.

その場合、図2(a)に示すように、ドリリングやパンチングなどによって、端部10aが挟持されたリジッド部18に貫通孔(スルーホール)を形成した後、貫通孔を含むリジッド部18の表面に、メッキしてメッキ層23を形成する。メッキ方法としては、無電解メッキや、無電解メッキ等と電解メッキとの組合せが利用される。   In this case, as shown in FIG. 2A, after the through hole (through hole) is formed in the rigid portion 18 with the end portion 10a sandwiched by drilling or punching, the surface of the rigid portion 18 including the through hole is formed. Then, the plating layer 23 is formed by plating. As a plating method, electroless plating or a combination of electroless plating and the like and electrolytic plating is used.

次いで、図2(b)に示すように、メッキ層23を所定のパターンにエッチング等して配線パターン23aを形成する。これによって、フレキシブル配線板10の端部10aに形成された配線パターンに対して、リジッド部18の配線パターン23aを導電接続することができる。   Next, as shown in FIG. 2B, the plating layer 23 is etched into a predetermined pattern to form a wiring pattern 23a. Thereby, the wiring pattern 23 a of the rigid portion 18 can be conductively connected to the wiring pattern formed on the end portion 10 a of the flexible wiring board 10.

リジッド部18には、必要に応じて、貴金属メッキやソルダーレジストの形成が行われる。また、必要に応じて、ルーター等による切断や外形加工が施される。   The rigid portion 18 is formed with precious metal plating or solder resist as necessary. In addition, cutting or external processing by a router or the like is performed as necessary.

[他の実施形態]
(1)前述の実施形態では、スルーホールメッキにより層間接続部を形成する例を示したが、本発明では、層間接続部の形成方法は何れでもよく、図3に示すように、レーザビア25によって、フレキシブル配線板10の端部10aに形成された配線パターンに対してリジッド部18の配線パターン23aを導電接続してもよい。
[Other Embodiments]
(1) In the above-described embodiment, an example in which an interlayer connection portion is formed by through-hole plating has been shown. However, in the present invention, any method for forming an interlayer connection portion may be used, and as shown in FIG. The wiring pattern 23a of the rigid portion 18 may be conductively connected to the wiring pattern formed on the end portion 10a of the flexible wiring board 10.

その場合、まず、図3(a)に示すようにレーザ加工によって、端部10aが挟持されたリジッド部18に非貫通孔を形成した後、非貫通孔の内面を含むリジッド部18の表面に、メッキしてメッキ層23を形成する。   In that case, first, as shown in FIG. 3A, a non-through hole is formed in the rigid portion 18 with the end 10a sandwiched by laser processing, and then the surface of the rigid portion 18 including the inner surface of the non-through hole is formed. The plating layer 23 is formed by plating.

次いで、図3(b)に示すように、メッキ層23を所定のパターンにエッチング等して配線パターン23aを形成する。これによって、フレキシブル配線板10の端部10aに形成された配線パターンに対して、リジッド部18の配線パターン23aを導電接続することができる。   Next, as shown in FIG. 3B, the plating layer 23 is etched into a predetermined pattern to form a wiring pattern 23a. Thereby, the wiring pattern 23 a of the rigid portion 18 can be conductively connected to the wiring pattern formed on the end portion 10 a of the flexible wiring board 10.

(2)前述の実施形態では、リジッド配線基板の積層単位として、2枚の両面配線基板の前躯体とプリプレグとを用いて、リジッド部が4層の配線層を有するフレックスリジッド配線基板を製造する例を示したが、本発明では、リジッド部の配線層の層数は何れでもよく、例えば図4に示すように、リジッド部18が2層の配線層を有するフレックスリジッド配線基板であってもよい。   (2) In the above-described embodiment, a rigid-rigid wiring board having a rigid portion having four wiring layers is manufactured by using a two-sided wiring board precursor and a prepreg as a laminate unit of the rigid wiring board. In the present invention, the number of layers of the rigid portion wiring layer is not limited. For example, as shown in FIG. 4, the rigid portion 18 may be a flex-rigid wiring board having two wiring layers. Good.

その場合、リジッド配線基板の積層単位として、プリプレグ11と別のプリプレグ31のみを用いて積層一体化し、その後、レーザ加工、メッキ、及びエッチングを行って、配線パターン23a、及びレーザビア25を形成することができる。また、リジッド配線基板の積層単位として、プリプレグ11と銅箔とを用いて積層一体化し、その後、貫通孔の形成、メッキ、及びエッチングを行って、配線パターン及びスルーホールメッキを形成することも可能である。   In that case, as a lamination unit of the rigid wiring board, only the prepreg 11 and another prepreg 31 are laminated and integrated, and then laser processing, plating, and etching are performed to form the wiring pattern 23a and the laser via 25. Can do. Also, as a laminate unit of the rigid wiring board, the prepreg 11 and the copper foil are laminated and integrated, and then the through hole is formed, plated, and etched to form the wiring pattern and the through hole plating. It is.

なお、リジッド部が4層以上の配線層を有するフレックスリジッド配線基板を製造する場合、リジッド配線基板の積層単位として、より多数の両面配線基板を積層したり、両面配線基板の代わりに、多層配線基板を用いればよい。   In addition, when manufacturing a flex-rigid wiring board having a rigid part having four or more wiring layers, a larger number of double-sided wiring boards can be laminated as a laminated unit of rigid wiring boards, or a multilayer wiring board can be used instead of a double-sided wiring board. A substrate may be used.

(3)前述の実施形態では、プリプレグと両面配線基板の前躯体とを別々に積層する例を示したが、本発明では、プリプレグを両面配線基板の前躯体と予め一体化させておき、これを積層する際に、フレキシブル配線板の端部と別のプリプレグを挟み込んで、この積層物を加熱加圧して一体化させてもよい。また、両面配線基板の前躯体を用いる代わりに、それらを構成する層を別体として積層し、更に他の部材を積層した積層物を加熱加圧して一体化させてもよい。   (3) In the above-described embodiment, the example in which the prepreg and the precursor of the double-sided wiring board are separately stacked has been shown. However, in the present invention, the prepreg is integrated with the precursor of the double-sided wiring board in advance. When laminating, the end of the flexible wiring board and another prepreg may be sandwiched, and the laminate may be integrated by heating and pressing. Further, instead of using the precursor of the double-sided wiring board, the layers constituting them may be laminated as separate bodies, and a laminate obtained by further laminating other members may be integrated by heating and pressing.

逆に、プリプレグでフレキシブル配線板の端部と別のプリプレグを挟み込んで予め一体化させておき、これに両面配線基板の前躯体を積層し、この積層物を加熱加圧して一体化させてもよい。   On the contrary, the end portion of the flexible wiring board and another prepreg are sandwiched and integrated in advance with a prepreg, and a precursor of a double-sided wiring board is laminated thereon, and this laminate is heated and pressed to be integrated. Good.

(4)前述の実施形態では、複数のリジッド配線基板からなるリジッド部がフレックス部に接続されている例を示したが、本発明では、少なくとも1つのリジッド部と少なくとも1つのフレックス部が接続されていればよい。   (4) In the above-described embodiment, an example in which a rigid portion including a plurality of rigid wiring boards is connected to the flex portion has been described. However, in the present invention, at least one rigid portion and at least one flex portion are connected. It only has to be.

(5)前述の実施形態では、図1(d’)に示すように、別のプリプレグ31が、両面銅張積層板のくり抜き部と略同じ形状のくり抜き部を有する例を示したが、図5(a)に示すように、別のプリプレグ31の形状としては、切断線Cに沿う端辺を有し、フレキシブル配線板10の端部10aが配置される切欠き部を有するものでもよい。つまり、切断線C,C間に、別のプリプレグ31が存在しない状態で、本発明を実施してもよい。   (5) In the above-described embodiment, as shown in FIG. 1 (d ′), another prepreg 31 has an example in which a cutout portion having substantially the same shape as the cutout portion of the double-sided copper-clad laminate is shown. As shown in 5 (a), the shape of another prepreg 31 may have a notch portion having an end side along the cutting line C and in which the end portion 10 a of the flexible wiring board 10 is disposed. That is, the present invention may be implemented in a state where another prepreg 31 does not exist between the cutting lines C and C.

また、図5(b)に示すように、別のプリプレグ31の端辺を、フレキシブル配線板10の端部10aの先端に沿って直線状に形成してもよい。このように、本発明では、両側の積層単位を接着するための両側のプリプレグが、フレキシブル配線板の端部を挟み込むと共に、残りの部分に別のプリプレグを挟み込んだ積層物を使用していれば、別のプリプレグの形状は何れでもよい。但し、フレキシブル配線板の端部と別のプリプレグとが重畳を有する形状は好ましくない。   Further, as shown in FIG. 5B, the end side of another prepreg 31 may be formed linearly along the tip of the end portion 10 a of the flexible wiring board 10. As described above, in the present invention, if the prepregs on both sides for adhering the laminated units on both sides sandwich the end of the flexible wiring board and use a laminate in which another prepreg is sandwiched between the remaining portions. The shape of another prepreg may be any. However, a shape in which the end portion of the flexible wiring board and another prepreg overlap each other is not preferable.

10 フレキシブル配線板
10a 端部
11 プリプレグ
17 フレックス部
18 リジッド部
22 スルーホールメッキ(層間接続部)
23a 配線パターン
25 レーザビア
31 別のプリプレグ
33 中間層
34 絶縁層
DESCRIPTION OF SYMBOLS 10 Flexible wiring board 10a End part 11 Prepreg 17 Flex part 18 Rigid part 22 Through-hole plating (interlayer connection part)
23a Wiring pattern 25 Laser via 31 Another prepreg 33 Intermediate layer 34 Insulating layer

Claims (7)

プリプレグを介してリジッド配線基板の積層単位でフレキシブル配線板を両側から挟み込んだ積層物を加熱加圧して一体化させる工程と、前記フレキシブル配線板の端部に形成された配線パターンと前記リジッド配線基板の配線パターンとを導電接続する層間接続部を形成する工程とを含むフレックスリジッド配線基板の製造方法であって、
前記積層物は、前記両側の積層単位を接着するための両側のプリプレグが、前記フレキシブル配線板の端部を挟み込むと共に、残りの部分には別のプリプレグを挟み込んだものであるフレックスリジッド配線基板の製造方法。
A step of heating and pressurizing a laminate in which a flexible wiring board is sandwiched from both sides in a laminate unit of a rigid wiring board via a prepreg, a wiring pattern formed at an end of the flexible wiring board, and the rigid wiring board A method of manufacturing a flex-rigid wiring board, including a step of forming an interlayer connection portion that conductively connects the wiring pattern of
In the laminate, the prepreg on both sides for adhering the laminated units on both sides sandwiches the end portion of the flexible wiring board, and another prepreg is sandwiched between the remaining portions of the flexible rigid wiring board. Production method.
前記別のプリプレグは、前記フレキシブル配線板の端部を配置するための切欠き部又はくり抜き部を有する請求項1記載のフレックスリジッド配線基板の製造方法。   The method for manufacturing a flex-rigid wiring board according to claim 1, wherein the another prepreg has a cutout portion or a cutout portion for disposing an end portion of the flexible wiring board. 前記別のプリプレグは、前記両側のプリプレグより加熱加圧時の温度での流動性が高いものである請求項1又は2に記載のフレックスリジッド配線基板の製造方法。   3. The method for manufacturing a flex-rigid wiring board according to claim 1, wherein the another prepreg has higher fluidity at a temperature at the time of heating and pressurization than the prepregs on both sides. 前記別のプリプレグは、前記フレキシブル配線板と略同じ厚さ又は若干薄い厚さを有している請求項1〜3いずれかに記載のフレックスリジッド配線基板の製造方法。   The method for manufacturing a flex-rigid wiring board according to any one of claims 1 to 3, wherein the another prepreg has substantially the same thickness as the flexible wiring board or a slightly thinner thickness. フレキシブル配線板で構成されるフレックス部と、このフレックス部に接続されたリジッド配線基板からなるリジッド部とを備えるフレックスリジッド配線基板であって、
前記リジッド部は前記フレキシブル配線板の端部を挟持した絶縁層を備えると共に、その絶縁層は、前記端部を挟持しない部分に前記フレキシブル配線板の厚みと略同じ厚さ又は若干薄い厚さを有する中間層を有し、その中間層はプリプレグが硬化して両側の絶縁層と一体化したものであり、
前記フレキシブル配線板の端部に形成された配線パターンと前記リジッド配線基板の配線パターンとを導電接続する層間接続部を有するフレックスリジッド配線基板。
A flex-rigid wiring board comprising a flex part composed of a flexible wiring board and a rigid part made of a rigid wiring board connected to the flex part,
The rigid portion includes an insulating layer that sandwiches the end portion of the flexible wiring board, and the insulating layer has a thickness that is substantially the same as or slightly thinner than the thickness of the flexible wiring board in a portion that does not sandwich the end portion. Having an intermediate layer, the intermediate layer is one in which the prepreg is cured and integrated with the insulating layers on both sides,
A flex-rigid wiring board having an interlayer connection portion for conductively connecting a wiring pattern formed at an end of the flexible wiring board and a wiring pattern of the rigid wiring board.
前記中間層は、前記フレキシブル配線板の端部が配置された切欠き部を有する請求項5記載のフレックスリジッド配線基板。   The flex-rigid wiring board according to claim 5, wherein the intermediate layer has a notch portion in which an end portion of the flexible wiring board is disposed. 前記中間層は、前記端部を挟持した絶縁層の形成に用いられたプリプレグよりも、流動性が高いプリプレグを用いて形成したものである請求項5又は6に記載のフレックスリジッド配線基板の製造方法。
The flex-rigid wiring substrate according to claim 5 or 6, wherein the intermediate layer is formed using a prepreg having higher fluidity than a prepreg used for forming an insulating layer sandwiching the end portion. Method.
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