JP3836515B2 - Flex rigid printed circuit board - Google Patents

Flex rigid printed circuit board Download PDF

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Publication number
JP3836515B2
JP3836515B2 JP20414493A JP20414493A JP3836515B2 JP 3836515 B2 JP3836515 B2 JP 3836515B2 JP 20414493 A JP20414493 A JP 20414493A JP 20414493 A JP20414493 A JP 20414493A JP 3836515 B2 JP3836515 B2 JP 3836515B2
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JP
Japan
Prior art keywords
flex
rigid
wiring board
printed wiring
rigid printed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP20414493A
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Japanese (ja)
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JPH0758424A (en
Inventor
千広 山口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
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Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP20414493A priority Critical patent/JP3836515B2/en
Publication of JPH0758424A publication Critical patent/JPH0758424A/en
Application granted granted Critical
Publication of JP3836515B2 publication Critical patent/JP3836515B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/46—Manufacturing multilayer circuits
    • H05K3/4688—Composite multilayer circuits, i.e. comprising insulating layers having different properties
    • H05K3/4691—Rigid-flexible multilayer circuits comprising rigid and flexible layers, e.g. having in the bending regions only flexible layers

Landscapes

  • Production Of Multi-Layered Print Wiring Board (AREA)
  • Structure Of Printed Boards (AREA)

Description

【０００１】
【産業上の利用分野】
本発明は、折り曲げ可能な可撓性を有するフレックス部と硬質材料からなるリジッド部とからなるフレックスリジッドプリント配線板に関する。
【０００２】
【従来の技術】
従来の技術について図４（ａ）及び（ｂ）を参照して説明する。図４（ａ）及び（ｂ）はそれぞれ、従来例によるフレックスリジッドプリント配線板の断面図及び上面図である。
【０００３】
図４（ａ）及び（ｂ）に示すように、従来のフレックスリジッドプリント配線板は、折り曲げ可能なフレックス部１０と硬質材料からなるリジッド部１１とからなり、この内、フレックス部１０は、銅箔等のパターン１２を施したフレキシブル配線板１３の銅箔パターン面にカバーレイフィルム１４を施している。リジッド部１１は、フレキシブル配線板１３の両面に、カバーレイフィルム１４、接着シート１５、リジッド材料１６を積層した構造である。１７はスルーホールである。
【０００４】
【発明が解決しようとする課題】
ところで、図４の形状では、図５に示すようにフレックス部１０がねじれた場合に、図５のフレックス部１０の外形とリジッド部１１の外形の交点の箇所に応力が集中し、フレキシブル材料が裂けるという場合があった。
【０００５】
また、図６に示すように、このフレックスリジッド配線板を筐体等に収める際、フレックス部１０を折り曲げる場合があるが、フレックス部１０をリジッド部１１に対して押さえるようにして折りぐせをつけると、上述と同様、フレックス部１０とリジッド部１１の境界部に応力が集中し、フレキシブル材料にクラック１８が入ったり、破れたりするという問題があった。
【０００６】
そこで、本発明の目的は、フレックス部とリジッド部との間の応力集中を避けることができ、フレックス部にクラックが入ったりすることのない高信頼性のフレックスリジッドプリント配線板を提供することにある。
【０００７】
【課題を解決するための手段】
前記目的を達成するために本発明は、可撓性を有するフレックス部と硬質材料からなるリジッド部とからなるフレックスリジッドプリント配線板において、前記フレックス部の外形線と前記リジッド部の外形線とが交差する部分にのみ、前記リジッド部と前記フレックス部の境界線よりリジッド部内方に湾曲する凹部を前記リジッド部を形成する硬質材料にのみ設けたことを特徴とする。
【０００８】
【作用】
上述のように、フレックス部の外形線とリジッド部の外形線とが交差する部分にのみ、前記リジッド部と前記フレックス部の境界線よりリジッド部内方に湾曲する凹部をリジッド部を形成する硬質材料にのみ設けているので、フレックス部をねじったり、折り曲げたりした場合でも、フレックス部とリジッド部間に生じる応力は凹部によって分散され、１箇所に集中することがない。従って、従来のように、フレックス部にクラックが入ったり破損することがなく、高信頼性のフレックスリジッドプリント配線板を提供できる。
【０００９】
【実施例】
本発明の一実施例について、図１乃至図３を参照して説明する。図１は本実施例によるフレックスリジッドプリント配線板の上面図、図２は同じくフレックスリジッドプリント配線板の積層状態を示す断面図、図３は図１のフレックスリジッドプリント配線板の一製造工程を示す上面図である。図４に示す従来例と同一機能部分には同一記号を付している。
【００１０】
本実施例のフレックスリジッドプリント配線板は、図１に示すように、フレックス部１の外形線とリジッド部２の外形線が交わる部分において、リジッド部側へ凹部３を設けた点に特徴がある。
【００１１】
上記構造とすることによって、フレックス部１がねじれた場合にも、フレックス部１とリジッド部２の境界近傍で折り曲げた場合にも、応力は凹部３によって分散され、フレックス部１の外形とリジッド部２の外形の交わる一点に集中することがない。従って、従来のように、フレキシブル材料にクラックが入ったり、裂けることはなく、機械的強度に強い高信頼性のフレックスリジッドプリント配線板を実現できる。
【００１２】
上記構造のフレックスリジッドプリント配線板の製造工程について、以下説明する。
【００１３】
まず、図２及び図３に示すように、所望のパターン１２が形成され、この上にパターン１２を保護するカバーレイフィルム１４を積層したフレキシブル配線板１３の両面から、フレックス部１に相当するＡ部分をくりぬいた接着シート１５とガラスエポキシ等のリジッド材料１６を積層する。
【００１４】
この時点で、本実施例の特徴である凹部３を構成する形状を、接着シート１５及びリジッド材料１６に対して形成しておく。また、４の箇所を直角の形状としておくと、完成した製品としてはその角部によってフレキシブル材料を傷つけるおそれがあるため、それを避けるよう丸みを持たせた形状とする。
【００１５】
この後、周知の穴空け、スルーホールめっき、外層のパターンエッチング、ソルダーレジスト印刷を施し、次いで外形加工によって、図３の破線５に沿って切断し、図１に示す本実施例の形状を得る。
【００１６】
【発明の効果】
以上のように、本発明によれば、フレックス部がねじれた場合や、フレックス部とリジッド部の境界近傍で折り曲げた場合でも、応力は凹部によって分散され、フレックス部の外形線とリジッド部の外形線の交わる一点に集中することがないので、フレキシブル材料にクラックが入ったり、裂けることがなく、機械的強度に強い高信頼性のフレックスリジッドプリント配線板を提供できる。
【図面の簡単な説明】
【図１】本発明の一実施例によるフレックスリジッドプリント配線板の上面図である。
【図２】図１のフレックスリジッドプリント配線板の材料積層状態を示す断面図である。
【図３】図１のフレックスリジッドプリント配線板の一製造工程を示す上面図である。
【図４】（ａ）及び（ｂ）はそれぞれ、従来例によるフレックスリジッドプリント配線板の断面図及び上面図である。
【図５】従来例の問題点を説明するためのフレックスリジッドプリント配線板の斜視図である。
【図６】従来例の他の問題点を説明するためのフレックスリジッドプリント配線板の斜視図である。
【符号の説明】
１ フレックス部
２ リジッド部
３ 凹部[0001]
[Industrial application fields]
The present invention relates to a flex-rigid printed wiring board composed of a flex portion having flexibility and a rigid portion made of a hard material.
[0002]
[Prior art]
The prior art will be described with reference to FIGS. 4 (a) and 4 (b). 4A and 4B are a cross-sectional view and a top view, respectively, of a flex-rigid printed wiring board according to a conventional example.
[0003]
As shown in FIGS. 4 (a) and 4 (b), the conventional flex-rigid printed wiring board is composed of a foldable flex portion 10 and a rigid portion 11 made of a hard material, of which the flex portion 10 is made of copper. A coverlay film 14 is applied to the copper foil pattern surface of the flexible wiring board 13 provided with a pattern 12 such as a foil. The rigid portion 11 has a structure in which a cover lay film 14, an adhesive sheet 15, and a rigid material 16 are laminated on both surfaces of the flexible wiring board 13. Reference numeral 17 denotes a through hole.
[0004]
[Problems to be solved by the invention]
By the way, in the shape of FIG. 4, when the flex part 10 twists as shown in FIG. 5, stress concentrates on the intersection of the external shape of the flex part 10 and the rigid part 11 of FIG. There was a case of tearing.
[0005]
Further, as shown in FIG. 6, when the flex-rigid wiring board is housed in a housing or the like, the flex part 10 may be bent, but the flex part 10 is folded against the rigid part 11 so as to be folded. As described above, there is a problem that stress concentrates on the boundary portion between the flex portion 10 and the rigid portion 11, and the flexible material cracks 18 or breaks.
[0006]
Accordingly, an object of the present invention is to provide a highly reliable flex-rigid printed wiring board that can avoid stress concentration between the flex part and the rigid part and that does not crack in the flex part. is there.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a flex-rigid printed wiring board comprising a flexible flex portion and a rigid portion made of a hard material, wherein the outer shape line of the flex portion and the outer shape line of the rigid portion are A concave portion that is curved inwardly of the rigid portion from a boundary line between the rigid portion and the flex portion is provided only in a hard material that forms the rigid portion only at a crossing portion.
[0008]
[Action]
As described above, a hard material that forms a rigid portion with a concave portion curved inward from the boundary between the rigid portion and the flex portion only at a portion where the outer shape line of the flex portion and the outer shape line of the rigid portion intersect. since only are provided, twist the flex portion, even if the bend, the stress generated between the flex portion and the rigid portion is dispersed by the recess, is not concentrated in one place. Therefore, unlike the conventional case, the flex portion is not cracked or broken, and a highly reliable flex-rigid printed wiring board can be provided.
[0009]
【Example】
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a top view of a flex-rigid printed wiring board according to the present embodiment, FIG. 2 is a cross-sectional view showing a laminated state of the flex-rigid printed wiring board, and FIG. 3 shows a manufacturing process of the flex-rigid printed wiring board of FIG. It is a top view. The same functional parts as those of the conventional example shown in FIG.
[0010]
As shown in FIG. 1, the flex-rigid printed wiring board of the present embodiment is characterized in that a concave portion 3 is provided on the rigid portion side at a portion where the outer shape line of the flex portion 1 and the outer shape line of the rigid portion 2 intersect. .
[0011]
With the above structure, even when the flex part 1 is twisted or bent near the boundary between the flex part 1 and the rigid part 2, the stress is dispersed by the recess 3, and the outer shape of the flex part 1 and the rigid part It does not concentrate on one point where the two outer shapes intersect. Therefore, unlike the conventional case, the flexible material is not cracked or torn, and a highly reliable flex-rigid printed wiring board having high mechanical strength can be realized.
[0012]
The manufacturing process of the flex-rigid printed wiring board having the above structure will be described below.
[0013]
First, as shown in FIGS. 2 and 3, a desired pattern 12 is formed, and A corresponding to the flex portion 1 is formed from both sides of a flexible wiring board 13 on which a coverlay film 14 for protecting the pattern 12 is laminated. The adhesive sheet 15 in which the portion is hollowed out and a rigid material 16 such as glass epoxy are laminated.
[0014]
At this point, the shape constituting the recess 3 which is a feature of the present embodiment is formed on the adhesive sheet 15 and the rigid material 16. Further, if the four portions are formed in a right-angle shape, the finished product has a risk of damaging the flexible material by the corner portion, so that the shape is rounded to avoid it.
[0015]
Thereafter, well-known drilling, through-hole plating, pattern etching of the outer layer, and solder resist printing are performed, and then cut along the broken line 5 in FIG. 3 to obtain the shape of the present embodiment shown in FIG. .
[0016]
【The invention's effect】
As described above, according to the present invention, even when the flex portion is twisted or bent near the boundary between the flex portion and the rigid portion, the stress is dispersed by the concave portion, and the outer shape line of the flex portion and the outer shape of the rigid portion are Since there is no concentration at one point where the lines intersect, it is possible to provide a highly-reliable flex-rigid printed wiring board that does not crack or break the flexible material and is strong in mechanical strength.
[Brief description of the drawings]
FIG. 1 is a top view of a flex-rigid printed wiring board according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a material lamination state of the flex-rigid printed wiring board of FIG.
3 is a top view showing one manufacturing process of the flex-rigid printed wiring board of FIG. 1. FIG.
FIGS. 4A and 4B are a cross-sectional view and a top view, respectively, of a flex-rigid printed wiring board according to a conventional example.
FIG. 5 is a perspective view of a flex-rigid printed wiring board for explaining problems of a conventional example.
FIG. 6 is a perspective view of a flex-rigid printed wiring board for explaining another problem in the conventional example.
[Explanation of symbols]
1 Flex part 2 Rigid part 3 Concave part

Claims (1)

可撓性を有するフレックス部と硬質材料からなるリジッド部とからなるフレックスリジッドプリント配線板において、
前記フレックス部の外形線と前記リジッド部の外形線とが交差する部分にのみ、前記リジッド部と前記フレックス部の境界線よりリジッド部内方に湾曲する凹部を前記リジッド部を形成する硬質材料にのみ設けたことを特徴とするフレックスリジッドプリント配線板。In a flex-rigid printed wiring board composed of a flex part having flexibility and a rigid part made of a hard material,
Only at the portion where the outer shape line of the flex portion and the outer shape line of the rigid portion intersect, only a hard material that forms the rigid portion has a concave portion that curves inwardly from the boundary line between the rigid portion and the flex portion. A flex-rigid printed wiring board characterized by being provided .
JP20414493A 1993-08-18 1993-08-18 Flex rigid printed circuit board Expired - Fee Related JP3836515B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20414493A JP3836515B2 (en) 1993-08-18 1993-08-18 Flex rigid printed circuit board

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20414493A JP3836515B2 (en) 1993-08-18 1993-08-18 Flex rigid printed circuit board

Publications (2)

Publication Number Publication Date
JPH0758424A JPH0758424A (en) 1995-03-03
JP3836515B2 true JP3836515B2 (en) 2006-10-25

Family

ID=16485570

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20414493A Expired - Fee Related JP3836515B2 (en) 1993-08-18 1993-08-18 Flex rigid printed circuit board

Country Status (1)

Country Link
JP (1) JP3836515B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007121921A (en) * 2005-10-31 2007-05-17 Sony Corp Optical communication module and optical communication equipment
CN101617575B (en) * 2007-02-20 2011-06-22 日立化成工业株式会社 Flexible multilayer wiring board
US8759687B2 (en) 2010-02-12 2014-06-24 Ibiden Co., Ltd. Flex-rigid wiring board and method for manufacturing the same
KR102415361B1 (en) 2015-07-30 2022-07-01 엘지이노텍 주식회사 Printed circuit board unit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0627982Y2 (en) * 1988-09-30 1994-07-27 株式会社小糸製作所 Rigid flex wiring board
JPH02137061U (en) * 1989-04-14 1990-11-15

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Publication number Publication date
JPH0758424A (en) 1995-03-03

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