JP4888462B2 - 電子部品の実装構造 - Google Patents
電子部品の実装構造 Download PDFInfo
- Publication number
- JP4888462B2 JP4888462B2 JP2008244040A JP2008244040A JP4888462B2 JP 4888462 B2 JP4888462 B2 JP 4888462B2 JP 2008244040 A JP2008244040 A JP 2008244040A JP 2008244040 A JP2008244040 A JP 2008244040A JP 4888462 B2 JP4888462 B2 JP 4888462B2
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- JP
- Japan
- Prior art keywords
- electronic component
- base resin
- substrate
- electrode
- conductive film
- 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.)
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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Description
ところが、一般にランドやバンプ電極は金属によって形成されており、したがって接合時に合わせずれが生じたり、あるいはランドやバンプ電極の位置精度が悪いことによってこれらの間で位置ずれが生じた場合に、これらランドとバンプ電極との間で十分な接合強度が得られず、接触不良(導電不良)を起こしてしまうおそれがあった。
また、基板やICなどの電子部品の反りや、ランドとバンプ電極などの形成高さのばらつきによって、ランドとバンプ電極間の距離が一定でなくなり、これらランドとバンプ電極との間で十分な接合強度が得られず、接触不良(導電不良)を起こしてしまうおそれがあった。
このプリント配線板によれば、金属導電層表面の凹凸によるアンカー効果により、部品実装時に圧力がかかっても、部品(電子部品)の接続電極が基板の電極上を滑ったり、ずれ落ちて傾いたりしないため、実装歩留まりが向上するとされている。
さらに、このような金属導電層を有するプリント配線板と接続電極を有する部品との接合構造(実装構造)においては、プリント配線板に部品を実装し固定するためにアンダーフィル材などの接着材が必要となっており、これが実装に要するコストの低減化を妨げる一因となっている。
また、接続部において下地樹脂が弾性変形していることで接着部が基板に接着され、導電膜と基板上の端子とが接続状態に保持されているので、バンプ電極と基板側の端子との接続状態が確保され、これによっても導電接続の信頼性が向上する。
本発明によれば、導電膜が、下地樹脂の第1の開口部から第2の開口部内に延びていることにより、第1の開口部および第2の開口部間の下地樹脂とその上の導電膜とによってバンプ電極が形成される。このようなバンプ電極は、基板側の端子に対して実装開始時には点接触し、実装達成後には面接触することになる。これにより、安定した電気的な接続を達成することができる。
本発明によれば、基板と電子部品との間にアンダーフィル材などの接着材を配する必要がなくなる。したがって、アンダーフィル材などの接着材に要する材料コストが低減され、また、このような接着材を配する工程も不要になって生産コストが低減されることにより、実装コストの低減化が図られる。
本発明によれば、下地樹脂の表面に間隔をおいて導電膜を設けることにより、複数のバンプ電極を形成することができ、製造が容易である。また、下地樹脂の一部に凸条部を形成することで、安定した電気的な接続を達成できるバンプ電極とすることができる。
本発明によれば、電子部品として半導体素子を適用した場合、半導体素子をその下地樹脂を介して基板に接続することができるので、半導体素子への応力伝達を抑制することができる。
図1は本発明に係る電子部品の実装構造を適用した液晶表示装置を示す模式図である。まず、図1を用いて本発明に係る電子部品の実装構造の適用例を説明する。
図1において符号100は液晶表示装置であり、この液晶表示装置100は、液晶パネル110と、電子部品(液晶駆動用ICチップ)121とを有して構成されている。なお、この液晶表示装置100には、図示しないものの、偏光板、反射シート、バックライト等の付帯部材が、必要に応じて適宜設けられるものとする。
この電子部品121は、例えば液晶パネル110を駆動する液晶駆動用ICチップである。電子部品121の下面には、本発明に係る多数のバンプ電極(図示せず)が形成されており、これらのバンプ電極は、基板張出部111T上の端子111bx,111cx,111dxにそれぞれ導電接続されている。これにより、基板111上に電子部品121が実装されてなる、本発明の実装構造が形成されている。
まず、本実施形態の電子部品の構造について述べる。図2(a)は電子部品121の能動面121a側の斜視図、図2(b)は図2(a)におけるA−A線矢視断面図である。図3(a)は実装構造の要部を拡大して示す斜視図、図3(b)は(a)におけるB−B線矢視断面図であって、同図において、符号11Pは基板111上に設けられた配線パターン、すなわち、配線111b、111c、111dのいずれかを表しており、符号11はこれら配線に設けられた端子、すなわち、前記した端子111bx、111cx,111dxのいずれかを表している。なお、本実施形態では、端子11は比較的膜厚が厚く、したがって高く形成されており、また、その横断面が略台形状になっている。
また、下地樹脂13は基板111に接着する機能を有する熱硬化性樹脂でも、光硬化性樹脂あるいはそれらを組み合わせた樹脂でも構わない。
また、複数の電極端子16を囲むようにして下地樹脂13が存在するために、電極端子16に水分が浸入し難く、電流のリーク(マイグレーション)などに対する信頼性も非常に高いものとなる。
また、下地樹脂13に各端子列16A,16Aに対応する開口部13b,13bを設けることによって、導電膜14によって覆われない部分も広く(大きく)なることから、基板111に直接接着する接着部13aの面積を増やすことができる。これによって、基板111への電子部品121の実装強度を高めることができる。
以下、本発明の第2実施形態について説明する。図5(a)は、第2実施形態における電子部品131の能動面131a側の平面図、図5(b)は(a)におけるD−D線矢視断面図である。
本実施形態の電子部品131では、下地樹脂13に開口部13bと開口部(第2の開口部)13cとがそれぞれ2つずつ、計4つの開口部13b,13b,13c,13cが設けられている。つまり、各端子列16A,16Aに対して設けられた開口部13b,13bの他に、これら各開口部13b,13bよりも内側でこれらに並行して延びる開口部13c,13cが設けられている。開口部13cは、開口部13bと略同様の大きさで平面視矩形状とされており、対応する開口部13bの近傍であって、該開口部13bとは所定間隔をおいて形成されている。
次に、本発明の第3実施形態について説明する。図6は、第3実施形態における電子部品141の能動面141a側の平面図である。
本実施形態の電子部品141では、下地樹脂13に、電子部品141の四辺に沿うようにして枠状に形成された開口部13dが一つ設けられている。この開口部13dは、能動面141aに設けられた全ての電極端子16に共通する開口部であって、その内側に能動面141aに設けられた全ての電極端子16が配置されている。これら複数の電極端子16は、電子部品141の各辺に沿ってそれぞれ複数個ずつ配置されており、開口部13dの周方向に沿って一列に配置されている。ここで、下地樹脂13における開口部13dによって囲まれた部分は、その横断面形状が略台形状となる凸条部とされている。
そして、下地樹脂13における導電膜14によって覆われている部分が基板111の端子11と接続する接続部13Aとなり、この接続部13A上の導電膜14の一部が電極として実質的に機能する部分となっている。本実施形態におけるバンプ電極23は、下地樹脂13の一部である接続部13Aと、その上を覆っている導電膜14の一部とによって構成されている。
また、上述した各実施形態における各開口部13b、13c、13d内に配置される複数の電極端子16が一列に整列配置されていなくてもよく、例えば、図7に示すように、隣り合う電極端子16同士が一列ではなく互い違い(ジグザグ)に配置されていてもよい。すなわち、各開口部13b、13c、13dは、それぞれ複数の電極端子16ごとに共通して形成されたものであることから、各電極端子16毎に独立して開口部をパターン形成する場合に比べて電極端子16の位置ずれにも対応することができるので、製造が容易である。
さらにまた、上述した各実施形態における各開口は、必要に応じ可変することができる。
Claims (5)
- 複数のバンプ電極を有する電子部品を、複数の端子を有する基板上に実装してなる電子部品の実装構造であって、
前記バンプ電極は、前記電子部品の能動面に設けられた下地樹脂と、該下地樹脂の表面の一部を覆い残部を露出させるとともに前記能動面に設けられた電極端子に導通する導電膜と、を有してなり、
前記下地樹脂は、複数の前記電極端子を取り囲む第1の開口部と、前記電極端子に一端を接続されるとともに前記表面に引き出された前記導電膜の一部が配置された接続部と、前記第1の開口部および前記接続部以外の領域に形成され、前記基板と接着された接着部と、を有し、前記接続部において前記下地樹脂が弾性変形していることで前記接着部が前記基板に接着され、前記導電膜と前記基板上の前記端子とが接続状態に保持されていることを特徴とする電子部品の実装構造。 - 前記下地樹脂には、前記能動面を露出させる第2の開口部が形成されており、
前記導電膜が前記第1の開口部から前記下地樹脂上を経由して前記第2の開口部内に延びている
ことを特徴とする請求項1記載の電子部品の実装構造。 - 前記基板と前記電子部品とは、前記下地樹脂の前記接着部の前記基板に対する接着力により、前記バンプ電極が前記端子に導電接触している状態が保持されている
ことを特徴とする請求項1または2記載の電子部品の実装構造。 - 前記下地樹脂の少なくとも一部に、横断面を略半円形状、略半楕円形状、または略台形状とする凸条部が形成され、前記導電膜は、前記下地樹脂の前記横断面方向に沿って前記表面の一部に帯状に設けられている
ことを特徴とする請求項1ないし3のいずれか一項に記載の電子部品の実装構造。 - 前記電子部品が、半導体素子である
ことを特徴とする請求項1ないし4のいずれか一項に記載の電子部品の実装構造。
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