JP5057653B2 - Flex-rigid wiring board and manufacturing method thereof - Google Patents

Flex-rigid wiring board and manufacturing method thereof Download PDF

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JP5057653B2
JP5057653B2 JP2005109477A JP2005109477A JP5057653B2 JP 5057653 B2 JP5057653 B2 JP 5057653B2 JP 2005109477 A JP2005109477 A JP 2005109477A JP 2005109477 A JP2005109477 A JP 2005109477A JP 5057653 B2 JP5057653 B2 JP 5057653B2
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wiring board
rigid
flex
prepreg
manufacturing
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JP2006294666A (en
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伸夫 福居
義徳 中臣
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Elna Co Ltd
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Elna Co Ltd
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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5(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. 5 (c), this flex-rigid wiring board is capable of mounting components, has a rigid portion 18 that can withstand the weight of the components, and has strength to be fixed to the housing, and can be freely bent and has 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5に示す方法で形成されていた。まず、図5(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 in FIG. 5 (a), a semi-cured prepreg 11 serving both as insulation and adhesion is placed on both surfaces (or one surface) of a flexible wiring board 10 to which printed wiring has been applied in advance. 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5(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. 5B, 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5(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、ローフロープリプレグが使用されていた。   As shown in FIG. 5C, 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.

また、このようなローフロープリプレグを使用せずに、プリプレグ11の流動を抑制する製造方法として、空隙部15に面したプリプレグ11の縁部を、加熱手段により予め硬化させておくフレックスリジッド配線基板の製造方法も知られている(例えば特許文献1参照)。   Further, as a manufacturing method for suppressing the flow of the prepreg 11 without using such a low-flow prepreg, a flex-rigid wiring board in which the edge portion of the prepreg 11 facing the gap portion 15 is previously cured by a heating means. Is also known (see, for example, Patent Document 1).

しかしながら、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、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。
特開2004−247453号公報
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 the other materials of the rigid part, the problem of deformation and peeling due to the difference in the coefficient of thermal expansion tends to occur, and the reliability of the wiring board has been lowered.
JP 2004-247453 A

そこで、本発明の目的は、フレキシブル配線板の使用量を少なくできるので、コスト的に有利であり、しかも配線基板の信頼性を高め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 that is advantageous in terms of cost because the amount of use of a flexible wiring board can be reduced, and to improve the reliability of the wiring board, and a method for manufacturing the same. It is in.

上記目的は、下記の如き本発明により達成できる。   The above object can be achieved by the present invention as described below.

即ち、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において、前記フレキシブル配線板は、端部のみが前記リジッド部の絶縁層に挟持されており、前記リジッド部は、向かい合う配線パターンの間に熱接着性シートであるプリプレグが硬化した絶縁層を有すると共に、前記端部に形成された配線パターンに対して前記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ていることを特徴とする。 That is, the flex-rigid wiring board of the present invention is a flex-rigid wiring board including a flex portion formed of a flexible wiring board and a rigid portion made of a rigid wiring board connected to the flex portion. In addition, only the end portion is sandwiched between the insulating layers of the rigid portion, and the rigid portion has an insulating layer in which a prepreg that is a heat-adhesive sheet is cured between facing wiring patterns, and is formed at the end portion. The rigid wiring pattern is conductively connected to the wiring pattern at an interlayer connection.

本発明のフレックスリジッド配線基板によると、端部のみが前記リジッド部の絶縁層に挟持されているため、フレキシブル配線板の使用量を少なくできるので、コスト的に有利となる。また、フレキシブル配線板が介在する面積が小さくなるため、熱膨張率の相違による変形や剥離の問題が生じにくく、配線基板の信頼性を高めることができる。更に、前記端部に形成された配線パターンに対して前記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ているため、電気的な接続の問題を回避できる。   According to the flex-rigid wiring board of the present invention, since only the end portion is sandwiched between the insulating layers of the rigid portion, the usage amount of the flexible wiring board can be reduced, which is advantageous in terms of cost. In addition, since the area where the flexible wiring board is interposed becomes small, the problem of deformation and peeling due to the difference in thermal expansion coefficient hardly occurs, and the reliability of the wiring board can be improved. Furthermore, since the wiring pattern of the rigid portion is conductively connected at the interlayer connection portion with respect to the wiring pattern formed at the end portion, the problem of electrical connection can be avoided.

上記において、前記層間接続部は、スルーホールメッキ又はレーザビアで形成されていることが好ましい。このような層間接続部であると、予めリジッド配線基板とフレキシブル配線板とを積層一体化した後に、上記のような層間接続部を容易かつ確実に形成することができる。   In the above, the interlayer connection part is preferably formed by through-hole plating or laser via. With such an interlayer connection portion, the above-described interlayer connection portion can be easily and reliably formed after the rigid wiring board and the flexible wiring board are laminated and integrated in advance.

一方、本発明のフレックスリジッド配線基板の製造方法は、熱接着性シート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を含むフレックスリジッド配線基板の製造方法において、前記積層物は熱接着性シートであるプリプレグを介して前記フレキシブル配線板の端部のみを挟み込む構造とすることで、向かい合う配線パターンの間に前記プリプレグが硬化した絶縁層を有するリジッド部を形成することを特徴とする。 On the other hand, the manufacturing method of the flex-rigid wiring board of the present invention includes a step of heat-pressing and integrating a laminate in which a flexible wiring board is sandwiched from both sides in a unit of lamination of a rigid wiring board via a thermal adhesive sheet. In the method of manufacturing a rigid wiring board, the laminate has a structure in which only an end portion of the flexible wiring board is sandwiched through a prepreg that is a heat-adhesive sheet, so that the prepreg is cured between facing wiring patterns. A rigid portion having a layer is formed .

本発明の製造方法によると、加熱加圧して一体化させる積層物が、フレキシブル配線板の端部のみを挟み込む構造であるため、フレキシブル配線板の使用量を少なくできるので、コスト的に有利となる。また、フレキシブル配線板が介在する面積が小さくなるため、熱膨張率の相違による変形や剥離の問題が生じにくく、配線基板の信頼性を高めることができる。   According to the manufacturing method of the present invention, since the laminate to be integrated by heating and pressing has a structure in which only the end portion of the flexible wiring board is sandwiched, the amount of use of the flexible wiring board can be reduced, which is advantageous in terms of cost. . In addition, since the area where the flexible wiring board is interposed becomes small, the problem of deformation and peeling due to the difference in thermal expansion coefficient hardly occurs, and the reliability of the wiring board can be improved.

また、前記一体化を行った後、スルーホールメッキ又はレーザビアによって、前記端部に形成された配線パターンに対して前記リジッド部の配線パターンを導電接続する工程を更に含むことが好ましい。これによって、前記端部に形成された配線パターンに対して前記リジッド部の配線パターンを容易かつ確実に導電接続することができ、電気的な接続の問題を回避できる。   In addition, it is preferable that the method further includes a step of conductively connecting the wiring pattern of the rigid portion to the wiring pattern formed on the end portion by through-hole plating or laser via after the integration. Accordingly, the wiring pattern of the rigid portion can be easily and reliably conductively connected to the wiring pattern formed at the end portion, and the problem of electrical connection can be avoided.

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。図1〜図2は、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である。特に、図2(b)には、本発明のフレックスリジッド配線基板の一例が示されている。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. 1 to 2 are process diagrams showing an example of a method for manufacturing a flex-rigid wiring board according to the present invention. In particular, FIG. 2B shows an example of the flex-rigid wiring board of the present invention. 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の硬化物などからなる絶縁層と、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 made of a cured product of the prepreg 11 and a wiring layer made of the wiring pattern 23a 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、フレキシブル配線板10の端部10aのみがリジッド部18の絶縁層に挟持されている。この絶縁層は、各種接着性シート等によって製造することができるが、汎用性が高いという理由から、プリプレグ11の硬化物で構成するのが好ましい。   In the present invention, as shown in FIG. 2 (b), only the end portion 10 a of the flexible wiring board 10 is sandwiched between the insulating layers of the rigid portion 18. Although this insulating layer can be manufactured with various adhesive sheets etc., it is preferable to comprise the cured | curing material of the prepreg 11 from the reason that versatility is high.

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.

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などの熱接着性シートを介して、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)と2枚のプリプレグ11とを用いる例を示す。   As shown in FIGS. 1A to 1D, the manufacturing method of the present invention is a laminate in which a flexible wiring board 10 is sandwiched from both sides in a rigid wiring board lamination unit via a thermal adhesive sheet such as a prepreg 11. It includes a step of heating and pressurizing and integrating the objects. In the present embodiment, an example is shown in which two double-sided wiring board precursors PW (patterned on only one side) and two prepregs 11 are 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 or laser vias.

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、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。   Next, as shown in FIG. 1 (b), the double-sided copper-clad laminate forming the flex portion 17 is cut out, and the outer shape of the rigid portion 18 is processed. These processes can be performed using a router or the like.

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)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、この積層物がフレキシブル配線板10の端部10aのみを挟み込む構造とする。   Next, as shown in FIG. 1 (d), a laminate is obtained in which the flexible wiring board 10 is sandwiched from both sides via the prepreg 11 so that the wiring patterns 12a face each other, with the laminate unit of the rigid wiring board being laminated. In that case, in this invention, it is set as the structure where this laminated body pinches | pinches only the edge part 10a of the flexible wiring board 10. FIG.

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、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。   The prepreg 11 includes a semi-cured resin that serves as both insulation and adhesion. Generally, a prepreg 11 is formed by applying a mixture of a thermosetting resin and a curing agent to a reinforcing material made of glass fiber or the like. It is formed in a semi-cured state (B-stage).

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13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。   When laminating, for example, the laminate is placed on a lower mirror plate via a release film. On top of that, the upper mirror plate is placed via the release film 13 and heated and pressed to integrate the laminate.

プリプレグ11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となる。   When the prepreg 11 is 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 precursor PW of the double-sided wiring board are formed. It acts as an adhesive to be connected and becomes an insulating layer of a rigid wiring board.

加熱加圧の条件は、プリプレグ11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 and type of the resin and the curing agent that form the prepreg 11, but when an epoxy resin is used, the temperature is 150 to 350 ° C, preferably 170 to 300 ° C. Is good.

本発明では、図2(a)〜(b)に示すように、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を導電接続する工程を更に含むことが好ましい。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 to 2B, after the integration, the rigid portion 18 is formed on the wiring pattern formed on the end portion 10a by the through-hole plating 22 or the laser via. It is preferable to further include a step of conductively connecting the wiring pattern 23. 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.

[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, the wiring pattern 23a and the laser via 25 can be formed by laminating and integrating only the prepreg 11 as a lamination unit of the rigid wiring substrate, and then performing laser processing, plating, and etching. 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 the rigid wiring board, or a multilayer wiring board can be used A substrate may be used.

(3)前述の実施形態では、プリプレグ等の熱接着性シート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、熱接着性シート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のみを挟み込んで、この積層物を加熱加圧して一体化させてもよい。逆に、熱接着性シートでフレキシブル配線板の端部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。   (3) In the above-described embodiment, the example in which the thermal adhesive sheet such as the prepreg and the precursor of the double-sided wiring board are separately laminated has been shown. However, in the present invention, the thermal adhesive sheet is used as the precursor of the double-sided wiring board. May be integrated in advance, and when laminating them, only the end of the flexible wiring board may be sandwiched, and this laminate may be heated and pressurized to be integrated. Conversely, the end portion of the flexible wiring board may be sandwiched with a heat-adhesive sheet and integrated in advance, and a precursor of a double-sided wiring board may be laminated on this, and the laminate may be integrated by heating and pressing. .

(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.

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 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

符号の説明Explanation of symbols

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
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

Claims (4)

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において、
前記フレキシブル配線板は、端部の幅3〜30mmの領域のみが前記リジッド部の絶縁層に挟持されており、前記リジッド部は、向かい合う配線パターンの間に熱接着性シートであるプリプレグが硬化した絶縁層を有すると共に、前記端部に形成された配線パターンに対して前記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ていることを特徴とするフレックスリジッド配線基板。
In 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,
In the flexible wiring board, only a region having a width of 3 to 30 mm at the end is sandwiched between the insulating layers of the rigid portion, and the prepreg which is a heat-adhesive sheet is cured between the wiring patterns facing each other. A flex-rigid wiring board having an insulating layer, wherein the wiring pattern of the rigid portion is conductively connected to the wiring pattern formed at the end portion at an interlayer connection portion.
前記層間接続部は、スルーホールメッキ又はレーザビアで形成されている請求項1記載のフレックスリジッド配線基板。   The flex-rigid wiring board according to claim 1, wherein the interlayer connection portion is formed by through-hole plating or laser via. 熱接着性シート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を含むフレックスリジッド配線基板の製造方法において、
前記積層物は熱接着性シートであるプリプレグを介して前記フレキシブル配線板の端部の幅3〜30mmの領域のみを挟み込む構造とすることで、向かい合う配線パターンの間に前記プリプレグが硬化した絶縁層を有するリジッド部を形成することを特徴とするフレックスリジッド配線基板の製造方法。
In a manufacturing method of a flex-rigid wiring board including a step of heating and pressing and integrating a laminate in which a flexible wiring board is sandwiched from both sides in a lamination unit of a rigid wiring board via a thermal adhesive sheet,
The laminate has a structure in which only the region of 3 to 30 mm in width at the end of the flexible wiring board is sandwiched through a prepreg which is a heat-adhesive sheet, so that the insulating layer in which the prepreg is cured between facing wiring patterns The manufacturing method of the flex-rigid wiring board characterized by forming the rigid part which has this.
前記一体化を行った後、スルーホールメッキ又はレーザビアによって、前記端部に形成された配線パターンに対して前記リジッド部の配線パターンを導電接続する工程を更に含む請求項3記載のフレックスリジッド配線基板の製造方法。   4. The flex-rigid wiring board according to claim 3, further comprising a step of conductively connecting the wiring pattern of the rigid portion to the wiring pattern formed at the end portion by through-hole plating or laser via after the integration. Manufacturing method.
JP2005109477A 2005-04-06 2005-04-06 Flex-rigid wiring board and manufacturing method thereof Expired - Fee Related JP5057653B2 (en)

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US8071883B2 (en) 2006-10-23 2011-12-06 Ibiden Co., Ltd. Flex-rigid wiring board including flexible substrate and non-flexible substrate and method of manufacturing the same
US7982135B2 (en) 2006-10-30 2011-07-19 Ibiden Co., Ltd. Flex-rigid wiring board and method of manufacturing the same
KR101098072B1 (en) 2008-03-10 2011-12-26 이비덴 가부시키가이샤 Flexible wiring board and method of manufacturing same
JPWO2010013366A1 (en) 2008-07-30 2012-01-05 イビデン株式会社 Flex-rigid wiring board and manufacturing method thereof
JP5293692B2 (en) * 2010-06-29 2013-09-18 エルナー株式会社 Flex-rigid wiring board and manufacturing method thereof

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JPH0693534B2 (en) * 1990-02-26 1994-11-16 日本アビオニクス株式会社 Flexible rigid printed wiring board
JPH05315758A (en) * 1992-05-01 1993-11-26 Nitto Denko Corp Multilayer flexible circuit board and manufacture thereof
JPH0766558A (en) * 1993-08-31 1995-03-10 Mitsubishi Gas Chem Co Inc Manufacture of rigid and flexible multilayer printed board
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JP3744383B2 (en) * 2000-06-09 2006-02-08 松下電器産業株式会社 Composite wiring board and manufacturing method thereof

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