JP2015065468A - Component mounting flexible printed circuit board - Google Patents

Component mounting flexible printed circuit board Download PDF

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Publication number
JP2015065468A
JP2015065468A JP2014246933A JP2014246933A JP2015065468A JP 2015065468 A JP2015065468 A JP 2015065468A JP 2014246933 A JP2014246933 A JP 2014246933A JP 2014246933 A JP2014246933 A JP 2014246933A JP 2015065468 A JP2015065468 A JP 2015065468A
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Prior art keywords
wiring
component
component mounting
mounting
opening
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渡邉 裕人
Hiroto Watanabe
裕人 渡邉
哲 鶴賀
Satoru Tsuruga
哲 鶴賀
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Fujikura Ltd
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Fujikura Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a component mounting flexible printed circuit board in which high integration can be achieved without generating disconnection, and to provide a manufacturing method thereof.SOLUTION: A component mounting flexible printed circuit board comprises: a substrate having flexibility; wiring which is formed on the substrate and with which a mounting pad is formed in a portion; a surface coverlay including a component mounting opening exposing the portion of the wiring including the mounting pad for covering a portion of the wiring excepting the exposed portion; and a mounting component mounted on the mounting pad. In the component mounting flexible printed board, a portion having flexural rigidity smaller than that at an edge of the component mounting opening is present in a distance separated from the component mounting opening just by a predetermined location at the edge of the component mounting opening.

Description

本発明は、部品実装フレキシブルプリント基板及びその製造方法に関する。   The present invention relates to a component-mounted flexible printed circuit board and a method for manufacturing the same.

可撓性を有する基板上に実装部品を半田付けしてなる部品実装フレキシブルプリント基板が知られている。この様な部品実装フレキシブルプリント基板においては、配線等の保護の為に、部品実装部分以外の部分をカバーレイによって覆っている。ここで、部品実装部分であるカバーレイの開口部では、実装部品と電極パッドとが半田により接続されるため、カバーレイと半田の間に存在する配線部分は、フレキシブルプリント基板を曲げた時に発生する応力が集中し易い。このため、カバーレイと半田の間に存在する配線部が短いと、応力集中によって配線が比較的断線しやすい、と言う問題があった。特に、近年、回路の高集積化、小型化に伴い、実装部品の実装スペースも小さくなり、カバーレイの部品実装開口部に露出する電極の大部分を半田が覆うことになり、カバーレイの開口縁部と半田との間の配線に応力が集中し、断線に至るケースが増大している。   2. Description of the Related Art A component-mounting flexible printed circuit board is known in which a mounting component is soldered on a flexible substrate. In such a component-mounting flexible printed circuit board, a portion other than the component-mounting portion is covered with a coverlay in order to protect wiring and the like. Here, at the opening of the cover lay, which is the part mounting part, the mounting part and the electrode pad are connected by solder, so the wiring part existing between the cover lay and the solder is generated when the flexible printed circuit board is bent. It is easy for stress to concentrate. For this reason, there is a problem that if the wiring portion existing between the coverlay and the solder is short, the wiring is relatively easily disconnected due to stress concentration. In particular, with the recent high integration and miniaturization of circuits, the mounting space for mounting components has also been reduced, so that most of the electrodes exposed to the component mounting opening of the coverlay are covered with solder, and the coverlay opening Stress is concentrated on the wiring between the edge and the solder, and the number of cases leading to disconnection is increasing.

この様な問題は、フレキシブルプリント基板の裏面に補強材を配置したり、例えば、下記特許文献1のように、フレキシブルプリント基板の裏面に実装部品を配置することによって部品実装部分の変形を抑え、上記断線の問題を回避している。しかし、この場合、製造工程の増加及びこれに伴う製造コストの増大、更に部品配置の自由度の低下を招いていた。   Such a problem is to arrange the reinforcing material on the back surface of the flexible printed circuit board, or to suppress the deformation of the component mounting part by arranging the mounting component on the back surface of the flexible printed circuit board, for example, as in Patent Document 1 below. The above disconnection problem is avoided. However, in this case, an increase in the manufacturing process and an accompanying increase in manufacturing cost, and a decrease in the degree of freedom of component placement have been caused.

特開2003−78228号公報JP 2003-78228 A

本発明はこの様な課題に鑑みてなされたものであり、コスト増大や部品配置自由度の低減を招くことなく、断線を防止して高集積化を図ることが可能な部品実装フレキシブルプリント基板及びその製造方法の提供を目的とする。   The present invention has been made in view of such a problem, and a component-mounting flexible printed circuit board capable of preventing disconnection and achieving high integration without incurring an increase in cost or a reduction in the degree of freedom of component placement, and It aims at providing the manufacturing method.

本発明に係る部品実装フレキシブルプリント基板は、可撓性を有する基板と、基板上形成され、一部に実装パッドが形成された配線と、配線の実装パッドを含む一部を露出させる部品実装開口を有し、配線の露出した部分以外の部分を覆う表面カバーレイと、実装パッドに実装された実装部品とを備える。また、本発明に係る部品実装フレキシブルプリント基板は、部品実装開口の周縁部の曲げ剛性よりも小さな曲げ剛性を有する部分が、部品実装開口の周縁部で部品実装開口から所定の位置だけ離れた距離に存在する。   A component-mounting flexible printed circuit board according to the present invention includes a flexible substrate, a wiring formed on the substrate and partially mounted with a mounting pad, and a component mounting opening that exposes a part of the wiring including the mounting pad. And a surface cover lay covering a portion other than the exposed portion of the wiring, and a mounting component mounted on the mounting pad. In the component-mounting flexible printed circuit board according to the present invention, the portion having a bending rigidity smaller than the bending rigidity of the peripheral portion of the component mounting opening is a distance at a predetermined position from the component mounting opening at the peripheral portion of the component mounting opening. Exists.

このような構成によれば、部品実装開口の周縁部の曲げ剛性よりも小さな曲げ剛性を有する部分が、部品実装開口の周辺部で部品実装開口から所定の距離だけ離れた位置に存在するので、これによって、当該小さな曲げ剛性を有する部分に応力を分散させ、実装部品の実装部分と表面カバーレイとの界面における応力集中を防止することができる。   According to such a configuration, a portion having a bending rigidity smaller than the bending rigidity of the peripheral portion of the component mounting opening is present at a position away from the component mounting opening by a predetermined distance in the peripheral portion of the component mounting opening. As a result, stress can be distributed to the portion having the small bending rigidity, and stress concentration at the interface between the mounting portion of the mounting component and the surface coverlay can be prevented.

また、本発明の一実施形態に係る部品実装フレキシブルプリント基板において、上記実装部品は半田によって実装パッドに接続され、この半田は部品実装開口の境界で表面カバーレイに接している。即ち、本発明によれば、フレキシブルプリント基板の更なる高集積
化を、断線の問題を回避しつつ実現可能となる。
In the component-mounted flexible printed board according to one embodiment of the present invention, the mounted component is connected to a mounting pad by solder, and the solder is in contact with the surface coverlay at the boundary of the component mounting opening. That is, according to the present invention, further high integration of the flexible printed circuit board can be realized while avoiding the problem of disconnection.

また、本発明の一実施形態に係る部品実装フレキシブルプリント基板は、基板上に、部品実装開口の実装パッドから配線が延びる方向と直交する方向の両側の表面カバーレイに覆われた部分に、配線が延びる方向の部品実装開口の幅よりも長い範囲で部品実装開口に沿って配線が延びる方向に一対の第1の表面補強配線が形成されている。このような場合には、上記部品実装開口の周縁部をこの表面補強配線で補強することにより、他の部分の断面曲げ剛性を相対的に小さくする事が可能である。更に、当該第1の表面補強配線は上記配線と同時に形成することが可能であり、製造コストを上昇させること無く実現可能である。またこの場合には、基板上の、第1の表面補強配線から配線が延びる方向に所定の距離だけ離れた位置に、配線に沿って配線が延びる方向に第2の表面補強配線が形成されていてもよい。この様な構成によれば、上記第1の表面補強配線と第2の表面補強配線との間の配線部分の断面の曲げ剛性を小さくする事が可能である。尚、当該第2の表面補強配線も上記配線と、上記第1の表面補強配線と共に形成することが可能であり、製造コストの上昇を招くことなく実現可能である。   In addition, the component-mounting flexible printed circuit board according to the embodiment of the present invention has a wiring on a portion of the board covered with the surface coverlays on both sides in the direction orthogonal to the direction in which the wiring extends from the mounting pad of the component mounting opening. A pair of first surface-reinforcing wirings are formed in a direction in which the wiring extends along the component mounting opening in a range longer than the width of the component mounting opening in the extending direction. In such a case, it is possible to relatively reduce the cross-sectional bending rigidity of other portions by reinforcing the peripheral edge portion of the component mounting opening with the surface reinforcing wiring. Further, the first surface reinforcing wiring can be formed simultaneously with the wiring, and can be realized without increasing the manufacturing cost. In this case, the second surface reinforcing wiring is formed in the direction extending along the wiring at a position on the substrate that is a predetermined distance away from the first surface reinforcing wiring in the direction in which the wiring extends. May be. According to such a configuration, it is possible to reduce the bending rigidity of the cross section of the wiring portion between the first surface reinforcing wiring and the second surface reinforcing wiring. The second surface reinforcing wiring can also be formed together with the wiring and the first surface reinforcing wiring, and can be realized without increasing the manufacturing cost.

また、本発明の他の実施形態に係る部品実装フレキシブルプリント基板においては、表面カバーレイに、部品実装開口から配線の延びる方向に所定の距離だけ離れた位置の配線を挟んだ両側に一対の第1の曲げ剛性低減用開口とが設けられていてもよい。即ち、表面カバーレイに第1の曲げ剛性低減用開口を設けることにより、この開口が設けられた部分の断面の曲げ剛性を小さくしている。このような構成は上記第1の曲げ剛性低減用開口を有するカバーレイを製造するための金型を製造する必要が生じるが、製造工程数は変わらない為、製造コストの上昇は極めて少ない。   In the component-mounting flexible printed circuit board according to another embodiment of the present invention, a pair of second printed wiring boards are disposed on both sides of the surface coverlay with the wiring at a predetermined distance in the direction in which the wiring extends from the component mounting opening. 1 bending rigidity reduction opening may be provided. That is, by providing the first cover rigidity reducing opening in the surface coverlay, the bending rigidity of the cross section of the portion where the opening is provided is reduced. In such a configuration, it is necessary to manufacture a mold for manufacturing the cover lay having the first bending rigidity reducing opening. However, since the number of manufacturing steps is not changed, an increase in manufacturing cost is extremely small.

また、本発明の他の実施形態に係る部品実装フレキシブルプリント基板は、基板の裏面のうち、部品実装開口に相当する部分を含む領域に形成された第1の裏面補強配線を更に備えていてもよい。このような構成においては、半田部分と表面カバーレイとの界面部分の配線の曲げ剛性を裏面補強配線によって大きくしている。また、第1の裏面補強配線も、他の構成と同時に製造可能であり、製造コストが増大することは無い。またこの場合においては、基板裏面の、第1の裏面補強配線から所定の距離だけ離れた位置から第2の裏面補強配線が形成されていても良い。   The component-mounting flexible printed board according to another embodiment of the present invention may further include a first back surface reinforcing wiring formed in a region including a portion corresponding to the component mounting opening in the back surface of the substrate. Good. In such a configuration, the bending rigidity of the wiring at the interface portion between the solder portion and the front coverlay is increased by the back surface reinforcing wiring. Further, the first back reinforcing wiring can be manufactured simultaneously with other configurations, and the manufacturing cost does not increase. In this case, the second back surface reinforcing wiring may be formed from a position on the back surface of the substrate that is a predetermined distance away from the first back surface reinforcing wiring.

また、本発明の他の実施形態に係る部品実装フレキシブルプリント基板は、基板の裏面に更に裏面カバーレイを有し、裏面カバーレイは、裏面カバーレイのうち、部品実装開口に相当する部分から所定の距離だけ離れた位置から形成された第2の曲げ剛性低減用開口を有していても良い。   In addition, the component mounting flexible printed board according to another embodiment of the present invention further includes a back cover lay on the back surface of the substrate, and the back cover lay is predetermined from a portion corresponding to the component mounting opening in the back cover lay. You may have the 2nd opening for bending-rigidity reduction formed from the position separated only by this distance.

また、本発明の他の実施形態に係る部品実装フレキシブルプリント基板は、部品実装開口から所定の距離だけ離れた上記配線の近傍に基板及び表面カバーレイを貫通する開口又は切り欠きを有していてもよい。即ち、表面カバーレイだけでなく、基板にも開口や切り欠きを設けることによって、更に効果的に当該部分の曲げ剛性を低減させ、応力の分散を図ることが可能である。   In addition, a component-mounted flexible printed circuit board according to another embodiment of the present invention has an opening or a notch penetrating the substrate and the surface cover lay in the vicinity of the wiring separated by a predetermined distance from the component mounting opening. Also good. That is, by providing openings and notches in the substrate as well as the surface coverlay, it is possible to more effectively reduce the bending rigidity of the portion and to distribute the stress.

本発明に係る部品実装フレキシブル基板の製造方法においては、まず可撓性を有する基板上に、一部に実装パッドが形成された配線を形成し、配線の実装パッドを含む一部を部品実装開口により露出させ、その他の部分を覆う様に表面カバーレイ及び裏面カバーレイのうち少なくとも表面カバーレイを形成し、配線の実装パッドに実装部品をはんだ付けする。また、本発明に係る部品実装フレキシブルプリント基板の製造方法においては、基板に配線と共に表面補強配線を形成するか、又は表面カバーレイ又は裏面カバーレイに部品実装開口部から所定距離だけ離れた位置に曲げ剛性低減用開口を形成することにより、部
品実装開口の周縁部の曲げ剛性よりも小さな曲げ剛性を有する部分を、配線の表面カバーレイに覆われた部分に形成する。
In the method for manufacturing a component-mounting flexible substrate according to the present invention, first, a wiring having a mounting pad formed in part is formed on a flexible substrate, and a part including the mounting pad of the wiring is formed as a component mounting opening. At least the front coverlay and the rear coverlay are formed so as to be exposed and cover the other parts, and the mounting components are soldered to the mounting pads of the wiring. Further, in the method for manufacturing a component-mounted flexible printed circuit board according to the present invention, the surface reinforcing wiring is formed together with the wiring on the substrate, or the front coverlay or the back coverlay is at a position away from the component mounting opening by a predetermined distance. By forming the bending rigidity reducing opening, a portion having a bending rigidity smaller than the bending rigidity of the peripheral edge portion of the component mounting opening is formed in the portion covered with the surface coverlay of the wiring.

本発明によれば、コスト増大や部品配置自由度の低減を招くことなく、断線を防止して高集積化を図ることが可能な部品実装フレキシブルプリント基板及びその製造方法の提供が可能となる。   According to the present invention, it is possible to provide a component-mounted flexible printed circuit board and a manufacturing method thereof that can prevent disconnection and achieve high integration without incurring an increase in cost and a reduction in freedom of component placement.

本発明の第1の実施形態に係る部品実装フレキシブルプリント基板の構成を示す平面図である。It is a top view which shows the structure of the component mounting flexible printed circuit board concerning the 1st Embodiment of this invention. 同実施形態の、他の態様に係る部品実装フレキシブルプリント基板の構成を示す平面図である。It is a top view which shows the structure of the component mounting flexible printed circuit board which concerns on the other aspect of the embodiment. 同実施形態の、他の態様に係る部品実装フレキシブルプリント基板の構成を示す平面図である。It is a top view which shows the structure of the component mounting flexible printed circuit board which concerns on the other aspect of the embodiment. 本発明の第2の実施形態に係る部品実装フレキシブルプリント基板の構成を示す平面図である。It is a top view which shows the structure of the component mounting flexible printed circuit board concerning the 2nd Embodiment of this invention. 本発明の第3の実施形態に係る部品実装フレキシブルプリント基板の構成を示す平面図である。It is a top view which shows the structure of the component mounting flexible printed circuit board which concerns on the 3rd Embodiment of this invention. 本発明の第4の実施形態に係る部品実装フレキシブルプリント基板の構成を示す平面図である。It is a top view which shows the structure of the component mounting flexible printed circuit board concerning the 4th Embodiment of this invention. 同部品実装フレキシブルプリント基板の一部の断面図である。It is sectional drawing of a part of the same component mounting flexible printed circuit board. 本発明の第5の実施形態に係る部品実装フレキシブルプリント基板の構成を示す平面図である。It is a top view which shows the structure of the component mounting flexible printed circuit board concerning the 5th Embodiment of this invention. 同部品実装フレキシブルプリント基板の一部の断面図である。It is sectional drawing of a part of the same component mounting flexible printed circuit board. 本発明の第6の実施形態に係る部品実装フレキシブルプリント基板の構成を示す平面図である。It is a top view which shows the structure of the component mounting flexible printed circuit board concerning the 6th Embodiment of this invention. 同部品実装フレキシブルプリント基板の一部の断面図である。It is sectional drawing of a part of the same component mounting flexible printed circuit board. 本発明の第7の実施形態に係る部品実装フレキシブルプリント基板の構成を示す平面図である。It is a top view which shows the structure of the component mounting flexible printed circuit board concerning the 7th Embodiment of this invention. 従来の部品実装フレキシブルプリント基板の構成例を示す平面図である。It is a top view which shows the structural example of the conventional component mounting flexible printed circuit board. 同部品実装フレキシブルプリント基板の構成を示す断面図である。It is sectional drawing which shows the structure of the same component mounting flexible printed circuit board. 同部品実装フレキシブルプリント基板を折り曲げた時の様子を示す断面図である。It is sectional drawing which shows a mode when the same component mounting flexible printed circuit board is bent. 同部品実装フレキシブルプリント基板において、断線が生じた時の様子を示す断面図である。It is sectional drawing which shows a mode when a disconnection arises in the same component mounting flexible printed circuit board. 同部品実装フレキシブルプリント基板の一部の断面図である。It is sectional drawing of a part of the same component mounting flexible printed circuit board.

以下、本発明の実施形態について説明するが、それに先立ち、まず部品実装フレキシブルプリント基板の高集積化に伴う断線の問題点について検討する。   Hereinafter, embodiments of the present invention will be described. Prior to that, first, the problem of disconnection associated with the high integration of a component-mounted flexible printed board will be examined.

[高集積化に伴う断線についての検討]
発明者らは、部品実装フレキシブルプリント基板の高集積化に伴い、上記断線が生じる理由について調査した。以下、その結論について説明する。図13は、従来の部品実装フレキシブルプリント基板の構成例を示す平面図であり、図14は、同部品実装フレキシブルプリント基板の構成を示す断面図である。部品実装フレキシブルプリント基板は、可撓性を有する基板101上に、部品を実装する為の一対の実装パッド102がそれぞれ形成された配線103を形成し、その上を覆うように表面カバーレイ104を基板101に接着材で接着する。表面カバーレイ104には、実装パッド102のみを露出させるための
開口104aが形成されている。開口104aによって露出された実装パッド102には、半田106によって実装部品105が実装されている。回路の集積化が進み、開口104aが小さくなると、半田106は、配線103に沿って開口104aの境界まで覆うこととなる。
[Study on disconnection due to high integration]
The inventors investigated the reason why the disconnection occurs with the high integration of the component-mounted flexible printed circuit board. The conclusion will be described below. FIG. 13 is a plan view showing a configuration example of a conventional component-mounted flexible printed board, and FIG. 14 is a cross-sectional view showing the configuration of the component-mounted flexible printed board. The component-mounting flexible printed circuit board has a wiring 103 on which a pair of mounting pads 102 for mounting components are respectively formed on a flexible substrate 101, and a surface coverlay 104 is formed so as to cover the wiring 103. The substrate 101 is bonded with an adhesive. An opening 104 a for exposing only the mounting pad 102 is formed in the surface coverlay 104. A mounting component 105 is mounted on the mounting pad 102 exposed through the opening 104 a by solder 106. As circuit integration progresses and the opening 104a becomes smaller, the solder 106 covers the boundary of the opening 104a along the wiring 103.

ここで、当該部品実装フレキシブルプリント基板の実装時や取り外し時等には、図15に示すように、部品実装フレキシブルプリント基板が曲がることがある。この際、半田106は可撓性を有しない為、配線103の半田106が固着している部分の曲げ剛性が大きくなる。従って、半田106と表面カバーレイ104の界面の配線103には、応力が集中する。ここで、半田106は表面カバーレイ104との界面において、図16の(a)から(b)に示すように、表面カバーレイ104から剥がれ易い。半田106が表面カバーレイ104から剥がれた場合、配線103のうち、表面カバーレイ104に覆われた部分は接着材104bを介して表面カバーレイ104に強固に接続され、半田106に覆われた部分は半田106に強固に固着している為、配線103の、半田106と表面カバーレイ104との界面に該当する部分には更に応力が集中し、図16(c)に示す通り、ここを起点として配線103にクラックが入り、断線を生じやすいことが分かった。   Here, when the component-mounted flexible printed board is mounted or removed, the component-mounted flexible printed board may be bent as shown in FIG. At this time, since the solder 106 does not have flexibility, the bending rigidity of the portion of the wiring 103 where the solder 106 is fixed increases. Therefore, stress concentrates on the wiring 103 at the interface between the solder 106 and the surface coverlay 104. Here, the solder 106 is easily peeled off from the surface coverlay 104 at the interface with the surface coverlay 104 as shown in FIGS. When the solder 106 is peeled off from the front cover lay 104, a portion of the wiring 103 covered with the front cover lay 104 is firmly connected to the front cover lay 104 via the adhesive 104 b and covered with the solder 106. Is firmly fixed to the solder 106, stress is further concentrated on the portion of the wiring 103 corresponding to the interface between the solder 106 and the surface cover lay 104. As shown in FIG. As a result, it was found that the wiring 103 was cracked and easily broken.

そこで本実施形態では、半田106と表面カバーレイ104との界面を通る断面の曲げ剛性よりも小さな曲げ剛性を有する部分を、配線103のうちカバーレイ104に覆われた部分であって、部品実装開口104aの周辺部で部品実装開口104aから所定の距離だけ離れた位置に設け、当該部品実装フレキシブルプリント基板が曲がった際に生じる応力をそこに分散させるようにしている。   Therefore, in the present embodiment, a portion having a bending rigidity smaller than the bending rigidity of the cross section passing through the interface between the solder 106 and the surface cover lay 104 is a portion covered with the cover lay 104 in the wiring 103 and is mounted as a component. It is provided at a position apart from the component mounting opening 104a by a predetermined distance at the periphery of the opening 104a, and the stress generated when the component mounting flexible printed circuit board is bent is dispersed therein.

ここで、一種類の材料で構成される構造体の曲げ剛性Mは、材料の弾性率をE、断面二次モーメントIをI=∫(y−ydAとすると、下記数1で表すことが可能である。

一方、図17に示すように、複合材の場合には、弾性率Eが中立軸y0からの距離yによって異なる。いま、中立軸y0からカバーレイ104の上面までの距離をy1、中立軸y0からカバーレイ104の下面までの距離をy2、中立軸y0から配線103上面までの距離をy3、中立軸y0から基板101上面までの距離をy4、中立軸y0から基板101下面までの距離をy5とし、基板101及びカバーレイ104の幅をW、配線103の幅をLとし、更にカバーレイ104の弾性率をE1、カバーレイ104と基板101を接着する接着剤104bの弾性率をE2、配線103の弾性率をE3、基板101の弾性率をE4とすると、図17に示すカバーレイ104によって覆われた部分の曲げ剛性M1は、下記数2で表される。
Here, the bending rigidity M of the structure formed of one kind of material is expressed by the following equation 1 where E is the elastic modulus of the material and I = ∫ (y−y 0 ) 2 dA. Can be represented.

On the other hand, as shown in FIG. 17, in the case of a composite material, the elastic modulus E varies depending on the distance y from the neutral axis y0. Now, the distance from the neutral axis y0 to the upper surface of the cover lay 104 is y1, the distance from the neutral axis y0 to the lower surface of the cover lay 104 is y2, the distance from the neutral axis y0 to the upper surface of the wiring 103 is y3, and the neutral axis y0 to the substrate 101, the distance from the upper surface of the substrate 101 is y4, the distance from the neutral axis y0 to the lower surface of the substrate 101 is y5, the width of the substrate 101 and the coverlay 104 is W, the width of the wiring 103 is L, and the elastic modulus of the coverlay 104 is E1. When the elastic modulus of the adhesive 104b for bonding the coverlay 104 and the substrate 101 is E2, the elastic modulus of the wiring 103 is E3, and the elastic modulus of the substrate 101 is E4, the portion covered by the coverlay 104 shown in FIG. The bending rigidity M1 is expressed by the following formula 2.

一方、半田106とカバーレイ104の界面における曲げ剛性M2は、部品実装開口の幅をw、半田106と表面カバーレイ104との界面自体の構成を無視すると、下記数3で表される。
On the other hand, the bending stiffness M2 at the interface between the solder 106 and the cover lay 104 is expressed by the following formula 3 when the width of the component mounting opening is w and the configuration of the interface itself between the solder 106 and the front cover lay 104 is ignored.

従って、下記種々の実施形態に係る部品実装フレキシブルプリント基板は、曲げ剛性M1又はM2を調整し、曲げ剛性M1が曲げ剛性M2よりも小さくなる部分が存在する様に構成される。   Therefore, the component-mounting flexible printed circuit board according to the following various embodiments is configured such that the bending rigidity M1 or M2 is adjusted, and there exists a portion where the bending rigidity M1 is smaller than the bending rigidity M2.

[第1の実施形態]
次に、本発明の第1の実施形態に係る部品実装フレキシブルプリント基板について説明する。図1は、本実施形態に係る部品実装フレキシブルプリント基板の構成を説明する為の平面図である。本実施形態に係る部品実装フレキシブルプリント基板は、可撓性を有する基板1と、基板1上に対向して一対の実装パッド2が形成され、実装パッド2からそれぞれ反対方向に引き出された配線3と、この配線3を覆うように基板1に接着材によって接着された表面カバーレイ4とを有する。表面カバーレイ4には、実装パッド2を含む配線3の一部を露出させる部品実装開口4aが形成されている。この部品実装開口4aから露出する実装パッド2に実装部品5が半田6によって実装されている。部品実装開口4aが小さいため、半田6は表面カバーレイ4に接している。
[First Embodiment]
Next, the component mounting flexible printed circuit board according to the first embodiment of the present invention will be described. FIG. 1 is a plan view for explaining the configuration of a component-mounted flexible printed board according to this embodiment. The component-mounting flexible printed circuit board according to the present embodiment has a flexible substrate 1 and a pair of mounting pads 2 formed on the substrate 1 so as to face each other, and wirings 3 drawn from the mounting pads 2 in opposite directions. And a surface cover lay 4 bonded to the substrate 1 with an adhesive so as to cover the wiring 3. The surface coverlay 4 is formed with a component mounting opening 4a that exposes a part of the wiring 3 including the mounting pad 2. A mounting component 5 is mounted by solder 6 on the mounting pad 2 exposed from the component mounting opening 4a. Since the component mounting opening 4 a is small, the solder 6 is in contact with the surface coverlay 4.

更に、本実施形態に係る部品実装フレキシブルプリント基板は、基板1上に、部品実装開口4aに相当する部分を挟んで形成された一対の第1の表面補強配線7を更に備えている。第1の表面補強配線7は、部品実装開口4aの配線3と交差する方向の両側に配置され、配線3の延びる方向に延び、部品実装開口4aの配線3の延びる方向の幅よりも長く形成され、部品実装開口4aを全体的に覆うように形成されている。即ち、本実施形態に係る部品実装フレキシブルプリント基板においては、この第1の表面補強配線7によって半田6とカバーレイ4との界面部分を補強し、この部分における曲げ剛性を大きくしている。従って、本実施形態においては、この一対の第1の表面補強配線7によって囲われた領域よりも、その外の領域に応力を分散させることが可能である。また、本実施形態においてはこの第1の表面補強配線7を配線3と同様の材料、同一プロセスで形成している。従って、製造プロセスの増加を招くことなく実現可能である。   Furthermore, the component mounting flexible printed circuit board according to the present embodiment further includes a pair of first surface reinforcing wirings 7 formed on the substrate 1 with a portion corresponding to the component mounting opening 4a interposed therebetween. The first surface reinforcing wiring 7 is disposed on both sides of the component mounting opening 4a in a direction intersecting the wiring 3, extends in the direction in which the wiring 3 extends, and is longer than the width of the component mounting opening 4a in the direction in which the wiring 3 extends. The component mounting opening 4a is entirely covered. That is, in the component-mounted flexible printed board according to the present embodiment, the interface portion between the solder 6 and the cover lay 4 is reinforced by the first surface reinforcing wiring 7, and the bending rigidity at this portion is increased. Therefore, in this embodiment, it is possible to disperse the stress in a region outside the region surrounded by the pair of first surface reinforcing wires 7. In the present embodiment, the first surface reinforcing wiring 7 is formed of the same material and the same process as the wiring 3. Therefore, it can be realized without increasing the manufacturing process.

次に、この第1の表面補強配線7の幅を規定する。本実施形態においては、一対の第1の表面補強配線7の横幅の合計をL7とすると、部品実装フレキシブルプリント基板の中立点から第1の表面補強配線7の上面、下面までの距離及び弾力係数は、全て配線3と同じである。従って、本実施形態において、半田6と表面カバーレイ4の界面における曲げ剛性M2−1は、上記数3の第2項のLをL+L7とすれば良く、下記数4によって規定される。
Next, the width of the first surface reinforcing wiring 7 is defined. In the present embodiment, if the total width of the pair of first surface reinforcing wirings 7 is L7, the distance from the neutral point of the component-mounted flexible printed circuit board to the upper and lower surfaces of the first surface reinforcing wirings 7 and the elasticity coefficient Are all the same as the wiring 3. Therefore, in the present embodiment, the bending rigidity M2-1 at the interface between the solder 6 and the surface coverlay 4 may be defined by the following equation (4), where L in the second term of equation (3) is L + L7.

本実施形態においては、このM2−1が数2のM1より大きくなれば良いため、第1の表面補強配線7の横幅の合計L7は、下記数5で表される。
In the present embodiment, since it is sufficient that this M2-1 is larger than M1 in Expression 2, the total lateral width L7 of the first surface reinforcing wiring 7 is expressed by the following Expression 5.

また、本実施形態においては、第1の表面補強配線7は配線3と同じ材質から構成されており、更にいかなる配線にも接続されていない。従って、第1の表面補強配線7は電気的にはフローティング状態であるから、寄生容量を生じる可能性もある。しかしながら、液晶やLED等に使用する場合には、特に問題を生じない。また、例えば配線3の一端が接地されていたような場合には、図2に示す通り、この接地端子側の配線3と第1の表面補強配線7とを接続することにより、かかる寄生容量の問題を解決し、半田6と表面カバーレイ4とのねじれを防止することによって機械的強度も更に強化し、更に第1の表面補
強配線7をシールドとして使用することも可能である。
Moreover, in this embodiment, the 1st surface reinforcement wiring 7 is comprised from the same material as the wiring 3, and is not connected to any wiring further. Accordingly, since the first surface reinforcing wiring 7 is electrically in a floating state, there is a possibility that parasitic capacitance is generated. However, there is no particular problem when used for liquid crystals, LEDs, and the like. Further, for example, when one end of the wiring 3 is grounded, the parasitic capacitance can be reduced by connecting the grounding terminal side wiring 3 and the first surface reinforcing wiring 7 as shown in FIG. By solving the problem and preventing the twisting of the solder 6 and the surface cover lay 4, the mechanical strength can be further strengthened, and the first surface reinforcing wiring 7 can be used as a shield.

また、本実施形態においては、一つの開口4a及び一対の第1の表面補強配線7について、一対の電極2が配置される。しかしながら、一つの開口4a及び一対の第1の表面補強配線7について、複数対の電極2を配置することも可能である。図3には、2対の電極2を配置した例を示している。尚、一つの開口4a及び一対の第1の表面補強配線7について、n対の電極2を配置する場合、第1の表面補強配線7の幅の合計L7はn倍する必要がある。   In the present embodiment, a pair of electrodes 2 is arranged for one opening 4 a and a pair of first surface reinforcing wires 7. However, it is also possible to arrange a plurality of pairs of electrodes 2 for one opening 4a and a pair of first surface reinforcing wirings 7. FIG. 3 shows an example in which two pairs of electrodes 2 are arranged. When n pairs of electrodes 2 are arranged for one opening 4a and a pair of first surface reinforcing wires 7, the total width L7 of the first surface reinforcing wires 7 needs to be multiplied by n.

次に、本実施形態に係る部品実装フレキシブルプリント基板の製造方法について説明する。本実施形態においては、まず可撓性を有する基板1上に、電極2、配線3及び第1の表面補強配線7を形成する。電極2と、配線3の一部が露出するように、配線3の一部以外の部分と、第1の表面補強配線7とを表面カバーレイ4によって覆う。次に、実装部品5を半田付けする。この際、半田6は、電極2、配線3の露出した部分及び実装部品5の端子を覆う。即ち、本実施形態においては電極2、配線3及び第1の表面補強配線7を一括して製造することが可能であり、製造工程数の増大を招くことなく実現することが可能である。   Next, the manufacturing method of the component mounting flexible printed circuit board concerning this embodiment is demonstrated. In the present embodiment, first, the electrode 2, the wiring 3, and the first surface reinforcing wiring 7 are formed on the flexible substrate 1. A portion other than a part of the wiring 3 and the first surface reinforcing wiring 7 are covered with the surface coverlay 4 so that the electrode 2 and a part of the wiring 3 are exposed. Next, the mounting component 5 is soldered. At this time, the solder 6 covers the exposed portions of the electrode 2 and the wiring 3 and the terminals of the mounting component 5. That is, in the present embodiment, the electrode 2, the wiring 3 and the first surface reinforcing wiring 7 can be manufactured in a lump, and can be realized without increasing the number of manufacturing steps.

[第2の実施形態]
次に、本発明の第2の実施形態に係る部品実装フレキシブルプリント基板について説明する。本実施形態に係る部品実装フレキシブルプリント基板は基本的には第1の実施形態と同様であるが、本実施形態においては、図4に示す通り、配線3の両端に、配線3に沿って第2の表面補強配線8を設けている。従って、本実施形態においては、第1の表面補強配線7と第2の表面補強配線8との間の領域に応力を集中させることが可能である。この様な構成にする場合には、例えばこの部分においてのみ配線3の幅を太くしたり、膜厚を厚くする等、集中的に断線対策を施すことも可能である。
[Second Embodiment]
Next, a component-mounted flexible printed board according to the second embodiment of the present invention will be described. The component-mounting flexible printed circuit board according to this embodiment is basically the same as that of the first embodiment. However, in this embodiment, as shown in FIG. Two surface reinforcing wirings 8 are provided. Therefore, in the present embodiment, it is possible to concentrate stress in a region between the first surface reinforcing wiring 7 and the second surface reinforcing wiring 8. In the case of such a configuration, for example, it is possible to intensively take measures against disconnection such as increasing the width of the wiring 3 only in this portion or increasing the film thickness.

[第3の実施形態]
次に、本発明の第3の実施形態に係る部品実装フレキシブルプリント基板について説明する。第1及び第2の実施形態においては、半田6と表面カバーレイ4との界面を含む断面における曲げ剛性を補強し、これによって当該断面における曲げ剛性M2−1を、その他の配線部分の曲げ剛性M1よりも大きくしていた。本実施形態においては、その他の配線部分の曲げ剛性を、半田6と表面カバーレイ4−3とを含む断面の曲げ剛性M2よりも小さくすることによって、半田6と表面カバーレイ4−3との界面に生じる応力を低減する。
[Third Embodiment]
Next, a component-mounted flexible printed circuit board according to the third embodiment of the present invention will be described. In the first and second embodiments, the bending rigidity in the cross section including the interface between the solder 6 and the surface coverlay 4 is reinforced, whereby the bending rigidity M2-1 in the cross section is changed to the bending rigidity of other wiring portions. It was larger than M1. In the present embodiment, the bending rigidity of the other wiring portion is made smaller than the bending rigidity M2 of the cross section including the solder 6 and the surface cover lay 4-3, whereby the solder 6 and the surface cover lay 4-3. Reduce the stress generated at the interface.

図5は、本実施形態に係る部品実装フレキシブルプリント基板の構成を示す平面図である。本実施形態に係る部品実装フレキシブルプリント基板の構成は、基本的には第1の実施形態に係る部品実装フレキシブルプリント基板と同様であるが、本実施形態においては第1の表面補強配線7が設けられていない。また、本実施形態に係るフレキシブルプリント基板においては、表面カバーレイ4−3の構成が異なっている。即ち、本実施形態においては、表面カバーレイ4−3は、部品実装開口4−3aの他に、配線3を挟んで第1の曲げ剛性低減用開口4−3cが設けられている。即ち、本実施形態においては、この第1の曲げ剛性低減用開口4−3cを含む断面における曲げ剛性M1−3を上記曲げ剛性M2よりも小さくすることによって、半田6と表面カバーレイ4−3との界面に生じる応力を低減するのである。本実施形態に係る構成を実現する為には、第1の曲げ剛性低減用開口4−3cを有する表面カバーレイを製造する為の金型を準備する必要があるが、製造工程数は変わらない為、製造コストの上昇は極めて少ない。   FIG. 5 is a plan view showing the configuration of the component-mounted flexible printed board according to the present embodiment. The configuration of the component-mounted flexible printed circuit board according to this embodiment is basically the same as that of the component-mounted flexible printed circuit board according to the first embodiment, but in this embodiment, the first surface reinforcing wiring 7 is provided. It is not done. Moreover, in the flexible printed circuit board which concerns on this embodiment, the structure of the surface coverlay 4-3 differs. That is, in the present embodiment, the surface cover lay 4-3 is provided with a first bending rigidity reducing opening 4-3c with the wiring 3 interposed therebetween in addition to the component mounting opening 4-3a. That is, in the present embodiment, the solder 6 and the surface coverlay 4-3 are formed by making the bending rigidity M1-3 in the cross section including the first bending rigidity reducing opening 4-3c smaller than the bending rigidity M2. This reduces the stress generated at the interface. In order to realize the configuration according to the present embodiment, it is necessary to prepare a mold for manufacturing the surface coverlay having the first bending rigidity reducing opening 4-3c, but the number of manufacturing steps is not changed. Therefore, the increase in manufacturing cost is extremely small.

次に、この第1の曲げ剛性低減用開口4−3cの幅を規定する。第1の曲げ剛性低減用
開口4−3cの幅の合計をW4−3とすると、第1の曲げ剛性低減用開口4−3cを含む断面の曲げ応力M1−3は、上記数2の第1項におけるWのうち、表面カバーレイ4−3及び接着剤に該当する部分をW−W4−3として、下記数6のように表すことが可能である。
Next, the width of the first bending rigidity reducing opening 4-3c is defined. Assuming that the total width of the first bending rigidity reducing opening 4-3c is W4-3, the bending stress M1-3 of the cross section including the first bending rigidity reducing opening 4-3c is the first of the above formula 2. Of the W in the term, the portion corresponding to the surface cover lay 4-3 and the adhesive can be expressed as W-W4-3 as shown in the following equation (6).

本実施形態においては、このM1−3が数3のM2よりも小さくなれば良いため、開口4−3bの幅の合計W4−3は、下記数7のように決定してもよい。
In the present embodiment, since it is sufficient that M1-3 is smaller than M2 in Equation 3, the total width W4-3 of the opening 4-3b may be determined as in Equation 7 below.

[第4の実施形態]
次に、第4の実施形態に係る部品実装フレキシブルプリント基板について説明する。本実施形態に係る部品実装フレキシブルプリント基板は、基本的には第1の実施形態に係る部品実装フレキシブルプリント基板と同様に構成されるが、図6及び図7に示す通り、本実施形態においては第1の表面補強配線7が設けられておらず、フレキシブルプリント基板裏面に、第1の裏面補強配線9が設けられており、この第1の裏面補強配線9によって半田6と表面カバーレイ4との界面部分の配線の曲げ剛性を大きくしている。本実施形態において、第1の裏面補強配線9は、部品実装開口4a内の半田6と表面カバーレイ4とを全て含む領域にわたって形成される。この構成においては、例えば部品実装フレキシブルプリント基板の裏面に他の構成を製造する場合には、当該他の構成と同時に製造可能であり、製造コストが増大することは無い。また、第1の裏面補強配線9は電気的にはフローティング状態となるが、液晶やLED等に使用する場合には、特に問題を生じない。
[Fourth Embodiment]
Next, a component-mounted flexible printed board according to the fourth embodiment will be described. The component-mounted flexible printed circuit board according to the present embodiment is basically configured in the same manner as the component-mounted flexible printed circuit board according to the first embodiment, but in this embodiment, as shown in FIGS. The first front surface reinforcing wiring 7 is not provided, and the first back surface reinforcing wiring 9 is provided on the back surface of the flexible printed circuit board. The flexural rigidity of the wiring at the interface part of is increased. In the present embodiment, the first back reinforcing wiring 9 is formed over a region including all of the solder 6 and the front surface coverlay 4 in the component mounting opening 4a. In this configuration, for example, when another configuration is manufactured on the back surface of the component-mounted flexible printed board, it can be manufactured simultaneously with the other configuration, and the manufacturing cost does not increase. In addition, the first back reinforcing wiring 9 is electrically in a floating state, but does not cause any particular problem when used for a liquid crystal, LED, or the like.

第1の裏面補強配線9の幅をL8、弾性率をE5、中立軸から第1の裏面補強配線9下面までの距離をy6とすると、半田6と表面カバーレイ4との界面を含む断面の曲げ剛性M2−4は、下記数8において表すことが可能である。
When the width of the first back surface reinforcing wiring 9 is L8, the elastic modulus is E5, and the distance from the neutral axis to the lower surface of the first back surface reinforcing wiring 9 is y6, the cross section including the interface between the solder 6 and the front coverlay 4 is shown. The bending stiffness M2-4 can be expressed by the following formula 8.

当該実施形態においては、このM2−4が、数2のM1よりも大きくなれば良い。従って、裏面補強部材9の幅L8は、下記数9によって決定しても良い。
In this embodiment, this M2-4 should be larger than M1 in Equation 2. Therefore, the width L8 of the back reinforcing member 9 may be determined by the following formula 9.

[第5の実施形態]
図8は、本発明の第5の実施形態に係る部品実装フレキシブルプリント基板の構成を示す平面図、図9は、同部品実装フレキシブルプリント基板の断面図である。本実施形態に係る部品実装フレキシブルプリント基板は、基本的には第4の実施形態に係る部品実装フレキシブルプリント基板と同様に構成されているが、本実施形態においては基板1裏面の、第1の裏面補強配線9から所定の間隔だけ離れた部分であって、配線3の裏面に相当する部分に第2の裏面補強配線10が設けられている。即ち、本実施形態においては、この第1の裏面補強配線9に相当する部分と、第2の裏面補強配線10に相当する部分の間に応力が集中する。尚、第2及び第3の実施形態と同様、この応力が集中する部分においてのみ配線3の幅を太くしたり、膜厚を厚くする等、集中的に断線対策を施すことも可能で
ある。
[Fifth Embodiment]
FIG. 8 is a plan view showing the configuration of a component-mounted flexible printed circuit board according to the fifth embodiment of the present invention, and FIG. 9 is a cross-sectional view of the component-mounted flexible printed circuit board. The component-mounted flexible printed circuit board according to the present embodiment is basically configured in the same manner as the component-mounted flexible printed circuit board according to the fourth embodiment, but in the present embodiment, A second back surface reinforcing wiring 10 is provided in a portion that is separated from the back surface reinforcing wiring 9 by a predetermined distance and that corresponds to the back surface of the wiring 3. That is, in the present embodiment, stress is concentrated between a portion corresponding to the first back surface reinforcing wiring 9 and a portion corresponding to the second back surface reinforcing wiring 10. Similar to the second and third embodiments, it is possible to take measures against disconnection intensively, for example, by increasing the width of the wiring 3 or increasing the film thickness only in the portion where the stress is concentrated.

[第6の実施形態]
図10は、本発明の第6の実施形態に係る部品実装フレキシブルプリント基板の構成を示す平面図、図11は、同部品実装フレキシブルプリント基板の断面図である。本実施形態に係る部品実装フレキシブルプリント基板は、基本的には第1の実施形態に係る部品実装フレキシブルプリント基板と同様に構成されているが、本実施形態においては実施形態においては第1の表面補強配線7が設けられていない。また、本実施形態においては基板1の裏面に裏面カバーレイ11が設けられている。裏面カバーレイ11は、表面カバーレイ4の部品実装開口4aを含む領域については、全面を覆っている。しかしながら、この部品実装開口4aを含む領域から所定の距離だけ離れた場所には第2の曲げ剛性低減用開口11aが設けられており、一部しか覆われていない。この構成においては、例えば部品実装フレキシブルプリント基板の裏面に当初から裏面カバーレイ11を形成する予定であった場合には、専用の金型を用意するだけでこの様な構成を実現可能である。
[Sixth Embodiment]
FIG. 10 is a plan view showing a configuration of a component-mounted flexible printed board according to the sixth embodiment of the present invention, and FIG. 11 is a cross-sectional view of the component-mounted flexible printed board. The component-mounted flexible printed circuit board according to the present embodiment is basically configured in the same manner as the component-mounted flexible printed circuit board according to the first embodiment, but in this embodiment, the first surface is the first surface. The reinforcing wiring 7 is not provided. In the present embodiment, a back cover lay 11 is provided on the back surface of the substrate 1. The back cover lay 11 covers the entire area of the front cover lay 4 including the component mounting opening 4a. However, the second bending rigidity reducing opening 11a is provided at a location away from the region including the component mounting opening 4a by a predetermined distance, and only a part thereof is covered. In this configuration, for example, when the back cover lay 11 is scheduled to be formed from the beginning on the back surface of the component-mounted flexible printed board, such a configuration can be realized only by preparing a dedicated mold.

裏面カバーレイ11の裏面開口11aの横幅は、以下のように規定することが可能である。即ち、裏面カバーレイ11の弾性率をE6、中立軸から裏面カバーレイ11までの距離をy7とし、裏面開口11aの横幅をL11とすると、第2の曲げ剛性低減用開口11aを含む断面の曲げ剛性M1−6は下記数10によって、半田6と表面カバーレイ4との界面を含む断面の曲げ剛性M2−6は下記数11によって表される。

The lateral width of the back surface opening 11a of the back surface cover lay 11 can be defined as follows. That is, when the elastic modulus of the back cover lay 11 is E6, the distance from the neutral axis to the back cover lay 11 is y7, and the lateral width of the back opening 11a is L11, the bending of the cross section including the second bending rigidity reducing opening 11a is performed. The rigidity M1-6 is expressed by the following expression 10, and the bending rigidity M2-6 of the cross section including the interface between the solder 6 and the surface coverlay 4 is expressed by the following expression 11.

従って、上記数10及び数11において、M2−6がM1−6より大きくなる様な裏面開口11aの横幅L10は、下記数12によって規定することが可能である。
Therefore, in the above formulas 10 and 11, the lateral width L10 of the back surface opening 11a such that M2-6 is larger than M1-6 can be defined by the following formula 12.

[第7の実施形態]
図12は、本発明の第7の実施形態に係る部品実装フレキシブルプリント基板の構成を示す平面図である。本実施形態に係る部品実装フレキシブルプリント基板は、第3の実施形態とほぼ同様に構成されているが、第3の実施形態においては表面カバーレイ4−3のみに第1の曲げ剛性低減用開口4−3aが形成されていたのに対し、本実施形態においては基板1−7及び表面カバーレイ4−7の両方に開口又は切り欠き1−7a及び4−7aが設けられている。従って、より好適に曲げ剛性を調整することが可能である。本実施形態においては、開口又は切り欠き1−7a及び開口4−7aの幅の合計をL1とすると、開口1−7a,4−7aを含む断面の曲げ剛性M1−7は、下記数13のように表すことが可能である。
[Seventh Embodiment]
FIG. 12 is a plan view showing a configuration of a component-mounting flexible printed board according to the seventh embodiment of the present invention. The component-mounting flexible printed circuit board according to the present embodiment is configured in substantially the same manner as in the third embodiment, but in the third embodiment, the first bending rigidity reducing opening is provided only in the surface coverlay 4-3. Whereas 4-3a is formed, in this embodiment, openings or notches 1-7a and 4-7a are provided in both the substrate 1-7 and the surface coverlay 4-7. Therefore, it is possible to adjust the bending rigidity more suitably. In this embodiment, when the total width of the openings or notches 1-7a and 4-7a is L1, the bending rigidity M1-7 of the cross section including the openings 1-7a and 4-7a is expressed by the following equation (13). Can be expressed as:

本実施形態においては、このM1−7が上記数3のM2よりも小さくなれば良い。従って、開口又は切り欠き1−7a及び開口又は切り欠き4−7aの幅の合計は下記数14のように表すことが可能である。
In the present embodiment, this M1-7 may be smaller than M2 of the above formula 3. Therefore, the sum of the widths of the opening or notch 1-7a and the opening or notch 4-7a can be expressed as the following Expression 14.

1,1−7,101…基板、1−7a…開口、2,102…実装パッド、3,103…配線、4,4−3,4−7,104…表面カバーレイ、4a,4−3a,4−7a,104a…部品実装開口、4b,104b…接着剤、4−3c…第1の曲げ剛性低減用開口、5,105…実装部品、6,106…半田、7…第1の表面補強配線、8…第2の表面補強配線、9…第1の裏面補強配線、10…第2の裏面補強配線、11…裏面カバーレイ、11a…第2の曲げ剛性低減用開口。   DESCRIPTION OF SYMBOLS 1,1-7,101 ... Board | substrate, 1-7a ... Opening, 2,102 ... Mounting pad, 3,103 ... Wiring, 4,4-3, 4-7, 104 ... Surface coverlay, 4a, 4-3a , 4-7a, 104a ... component mounting opening, 4b, 104b ... adhesive, 4-3c ... first bending rigidity reducing opening, 5,105 ... mounting component, 6, 106 ... solder, 7 ... first surface Reinforcement wiring, 8 ... second surface reinforcement wiring, 9 ... first back surface reinforcement wiring, 10 ... second back surface reinforcement wiring, 11 ... back surface coverlay, 11a ... second bending rigidity reducing opening.

Claims (5)

可撓性を有する基板と、
前記基板上に形成され、一部に実装パッドが形成された配線と、
前記配線の前記実装パッドを含む一部を露出させる部品実装開口を有し、前記配線の露出した部分以外の部分を覆う表面カバーレイと、
前記実装パッドに実装された実装部品と
を備え、
前記部品実装開口の周縁部の曲げ剛性よりも小さな曲げ剛性を有する部分が、前記部品実装開口の周辺部で前記部品実装開口から所定の距離だけ離れた位置に存在し、
前記基板の裏面のうち、前記部品実装開口に相当する部分を含む領域に形成された第1の裏面補強配線を更に備え、
前記基板裏面の、前記第1の裏面補強配線から所定の距離だけ離れた位置から形成された第2の裏面配線補強配線を更に備えた
ことを特徴とする部品実装フレキシブルプリント基板。
A flexible substrate;
A wiring formed on the substrate and partially formed with a mounting pad;
A surface coverlay that has a component mounting opening that exposes a part of the wiring including the mounting pad and covers a portion other than the exposed portion of the wiring;
A mounting component mounted on the mounting pad, and
A portion having a bending rigidity smaller than a bending rigidity of a peripheral edge portion of the component mounting opening is present at a position away from the component mounting opening by a predetermined distance in a peripheral portion of the component mounting opening,
Of the back surface of the substrate, further comprising a first back surface reinforcing wiring formed in a region including a portion corresponding to the component mounting opening,
A component-mounted flexible printed board, further comprising a second back surface wiring reinforcing wire formed from a position on the back surface of the substrate at a predetermined distance from the first back surface reinforcing wiring.
可撓性を有する基板と、
前記基板上に形成され、一部に実装パッドが形成された配線と、
前記配線の前記実装パッドを含む一部を露出させる部品実装開口を有し、前記配線の露出した部分以外の部分を覆う表面カバーレイと、
前記実装パッドに実装された実装部品と
を備え、
前記部品実装開口の周縁部の曲げ剛性よりも小さな曲げ剛性を有する部分が、前記部品実装開口の周辺部で前記部品実装開口から所定の距離だけ離れた位置に存在し、
前記表面カバーレイは、前記部品実装開口から前記配線の延びる方向に所定の距離だけ離れた位置の前記配線を挟んだ両側に一対の第1の曲げ剛性低減用開口が形成されている
ことを特徴とする部品実装フレキシブルプリント基板。
A flexible substrate;
A wiring formed on the substrate and partially formed with a mounting pad;
A surface coverlay that has a component mounting opening that exposes a part of the wiring including the mounting pad and covers a portion other than the exposed portion of the wiring;
A mounting component mounted on the mounting pad, and
A portion having a bending rigidity smaller than a bending rigidity of a peripheral edge portion of the component mounting opening is present at a position away from the component mounting opening by a predetermined distance in a peripheral portion of the component mounting opening,
The surface cover lay has a pair of first bending rigidity reducing openings formed on both sides of the wiring at a predetermined distance from the component mounting opening in a direction in which the wiring extends. Component mounting flexible printed circuit board.
可撓性を有する基板と、
前記基板上に形成され、一部に実装パッドが形成された配線と、
前記配線の前記実装パッドを含む一部を露出させる部品実装開口を有し、前記配線の露出した部分以外の部分を覆う表面カバーレイと、
前記実装パッドに実装された実装部品と
を備え、
前記部品実装開口の周縁部の曲げ剛性よりも小さな曲げ剛性を有する部分が、前記部品実装開口の周辺部で前記部品実装開口から所定の距離だけ離れた位置に存在し、
前記基板の裏面に更に裏面カバーレイを有し、
前記裏面カバーレイは、
前記裏面カバーレイのうち、前記部品実装開口に相当する部分から所定の距離だけ離れた位置から形成された第2の曲げ剛性低減用開口を有する
ことを特徴とする部品実装フレキシブルプリント基板。
A flexible substrate;
A wiring formed on the substrate and partially formed with a mounting pad;
A surface coverlay that has a component mounting opening that exposes a part of the wiring including the mounting pad and covers a portion other than the exposed portion of the wiring;
A mounting component mounted on the mounting pad, and
A portion having a bending rigidity smaller than a bending rigidity of a peripheral edge portion of the component mounting opening is present at a position away from the component mounting opening by a predetermined distance in a peripheral portion of the component mounting opening,
A back coverlay is further provided on the back surface of the substrate,
The back coverlay is
A component-mounting flexible printed circuit board, comprising: a second bending rigidity reducing opening formed at a predetermined distance from a portion corresponding to the component-mounting opening in the back cover lay.
可撓性を有する基板と、
前記基板上に形成され、一部に実装パッドが形成された配線と、
前記配線の前記実装パッドを含む一部を露出させる部品実装開口を有し、前記配線の露出した部分以外の部分を覆う表面カバーレイと、
前記実装パッドに実装された実装部品と
を備え、
前記部品実装開口の周縁部の曲げ剛性よりも小さな曲げ剛性を有する部分が、前記部品実装開口の周辺部で前記部品実装開口から所定の距離だけ離れた位置に存在し、
前記部品実装開口から所定の距離だけ離れた前記配線の近傍に前記基板及び前記表面カバーレイを貫通する開口又は切り欠きを有する
ことを特徴とする部品実装フレキシブルプリント基板。
A flexible substrate;
A wiring formed on the substrate and partially formed with a mounting pad;
A surface coverlay that has a component mounting opening that exposes a part of the wiring including the mounting pad and covers a portion other than the exposed portion of the wiring;
A mounting component mounted on the mounting pad, and
A portion having a bending rigidity smaller than a bending rigidity of a peripheral edge portion of the component mounting opening is present at a position away from the component mounting opening by a predetermined distance in a peripheral portion of the component mounting opening,
A component-mounted flexible printed board comprising an opening or a notch penetrating the substrate and the surface cover lay in the vicinity of the wiring separated by a predetermined distance from the component mounting opening.
前記実装部品は、半田によって前記実装パッドに接続され、
前記半田は、前記部品実装開口の境界で前記表面カバーレイに接している
ことを特徴とする請求項1〜4に記載の部品実装フレキシブルプリント基板。
The mounting component is connected to the mounting pad by solder,
The component mounting flexible printed board according to claim 1, wherein the solder is in contact with the surface coverlay at a boundary of the component mounting opening.
JP2014246933A 2014-12-05 2014-12-05 Component mounting flexible printed circuit board Pending JP2015065468A (en)

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KR20170000895A (en) * 2015-06-24 2017-01-04 삼성전자주식회사 Circuit boards and semiconductor packages including the same
JP2019050333A (en) * 2017-09-12 2019-03-28 日立化成株式会社 Stretchable device and manufacturing method thereof
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