JP4798237B2 - Ic搭載基板、及び多層プリント配線板 - Google Patents
Ic搭載基板、及び多層プリント配線板 Download PDFInfo
- Publication number
- JP4798237B2 JP4798237B2 JP2009055533A JP2009055533A JP4798237B2 JP 4798237 B2 JP4798237 B2 JP 4798237B2 JP 2009055533 A JP2009055533 A JP 2009055533A JP 2009055533 A JP2009055533 A JP 2009055533A JP 4798237 B2 JP4798237 B2 JP 4798237B2
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- Prior art keywords
- layer
- insulating
- insulating layer
- pattern
- printed wiring
- Prior art date
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- 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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0271—Arrangements for reducing stress or warp in rigid printed circuit boards, e.g. caused by loads, vibrations or differences in thermal expansion
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- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
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- H01L23/538—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames the interconnection structure between a plurality of semiconductor chips being formed on, or in, insulating substrates
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- H05K3/00—Apparatus or processes for manufacturing printed circuits
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- H05K3/4611—Manufacturing multilayer circuits by laminating two or more circuit boards
- H05K3/4626—Manufacturing multilayer circuits by laminating two or more circuit boards characterised by the insulating layers or materials
- H05K3/4632—Manufacturing multilayer circuits by laminating two or more circuit boards characterised by the insulating layers or materials laminating thermoplastic or uncured resin sheets comprising printed circuits without added adhesive materials between the sheets
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Description
また、本発明のIC搭載基板は、絶縁層および配線パターンが複数積層された構造を有するので、多層プリント配線板の面積を小さくすることができる。
また、多層プリント配線板における強化材は、複数の絶縁層のうち、電極部が形成された絶縁層を一層目、その一層目の絶縁層に電極部の反対側から積層された絶縁層を二層目
として、このうち一層目を除き、二層目を含む複数の絶縁層に渡って埋設されているので以下の効果を有する。即ち、IC搭載基板の製造過程において、一層目の絶縁層に直下領域(凹部)を形成する必要がないため、強化材が電極部に接しないように加工する技術を用いずに済む。例えば二層目以下の複数の絶縁層(以下、対象絶縁層群という)を貫通させることで直下領域(貫通孔)を形成し、その大きさに合致する強化材を貫通孔に挿入し、第一層の絶縁層と他の絶縁層(又は絶縁層群)とで対象絶縁層群を挟み込むことにより、容易に強化材を埋設させることができる。
さらに、本発明のIC搭載基板によれば、第二面上の配線パターンが直下領域に相当する領域にのみ形成されているので、実質的に一層目の絶縁層のうち直下領域に相当する部分のみを薄くすることに等しく、ベアチップをプリント配線板に適切に接続することができると共に、他の絶縁層の厚みを充分に確保することにより、信号線幅を不要に狭めることなく、線路の導体損を抑制することができる。
ところで、プリント配線板の特性インピーダンスを所定値(例えば50Ω)に合わせるためには、例えば配線パターンがマイクロストリップ線路で形成される場合、絶縁層の厚みを小さくするほど、信号線幅を狭くする必要がある。ここで、信号線幅を狭くしすぎると、線路の導体損が増加して、回路全体の損失が増加してしまうことが指摘される。
よって、本発明のIC搭載器版によれば、第一面上の配線が線路パターン、第三面上の配線がグランドパターン、電極部に対向する直下領域に相当する領域のみ存在する第二面上の配線がグランドパターンであるので、マイクロストリップ線路において、絶縁層の厚みを充分に確保することができ、信号線幅を不要に狭めることなく、導体損失の悪化を好適に抑制することができる。
そこで、多層プリント配線板は、請求項4に記載のように、複数の絶縁層のうち、一層目の絶縁層の厚みが、他の絶縁層の厚みに比べて小さくなるように構成されることが望ましい。
次に、第二発明である多層プリント配線板は、請求項6に記載のように、絶縁材からなる絶縁層上に配線パターンが形成され、これら絶縁層および配線パターンが複数積層されてなる多層プリント配線板であって、配線パターンとICのベアチップとを電気的に接続するための電極部を備えている。そして、複数の絶縁層のうち、電極部が形成された絶縁層を一層目、その一層目の絶縁層に電極部の反対側から積層された絶縁層を二層目として、一層目の絶縁層において電極部を含む側の第一面上、一層目と二層目とが重なる第二面上、及び、二層目の絶縁層において一層目に対する反対側の第三面上に配線パターンがそれぞれ形成されている。
ここで、多層プリント配線板における複数の絶縁層は、一層目を除き、且つ二層目を含む複数の絶縁層に渡って電極部に対向する直下領域に、少なくとも絶縁材に比べて剛性の高い強化材、及び、第二面上の配線パターンと第三面上の配線パターンとを接続するビアが埋設される。そして、上記複数の配線パターンは、線路パターンとグランドパターンとの組合せからなるマイクロストリップ線路により形成され、上記複数の絶縁層は、第一面上に線路パターンが形成されるとともに、第二面上及び第三面上にグランドパターンがそれぞれ形成され、且つ、第二面上のグランドパターンが直下領域に相当する領域にのみ形成されていることを要旨とする。
[第一実施形態]
図1は、第一実施形態におけるIC搭載基板の構成を断面視で示す構成図、図2は、その製造方法における主要な行程を断面視で示す行程図である。
図1に示すように、IC搭載基板1は、銅薄膜を加工して形成された複数の配線パターン10が多層化された構造を有する多層プリント配線板2と、シリコン等の半導体からなるICのベアチップ3と、コンデンサーや抵抗等のチップ部品4とを備え、多層プリント配線板2の表面に、ベアチップ3及びチップ部品4が実装されている。なお、ベアチップ3と多層プリント配線板2の表面とは、金や銅等の導体ワイヤ5を介して電気的に接続されている。また、チップ部品4は、多層プリント配線板2に内蔵されてもよい。
次に、本実施形態のIC搭載基板1の製造方法Aにおける主要な行程を説明する。
図2に示すように、IC搭載基板1の製造方法Aでは、絶縁層20と配線パターン10とを一層毎に順次積み上げて作製されたベース基板8の上に、絶縁層20及び銅部材6をさらに積み上げてプレス基板9を作製するシーケンシャル積層法が用いられる。
このIC搭載基板1の製造方法Aでは、ワイヤボンディング接続により、ベアチップ3のパッド部3a,3bと、多層プリント配線板2の電極部10a,10bとを接続する際に、多層プリント配線板2側に超音波および荷重が与えられても、絶縁層20の直下位置に設けられた銅部材6により、その超音波および荷重が分散されずに済むため、電極部10a,10bに導体ワイヤ5を適切に熱融着させることができる。
また、IC搭載基板1によれば、配線パターン10と同じ線膨張係数となるように、銅部材6と配線パターン10との材質を同じにすることにより、銅部材6からの絶縁層20の剥離、及びその付随効果として、絶縁層20からの配線パターン10の剥離を防止することができる。
次に、本発明の第二実施形態を図面と共に説明する。
図3は、第二実施形態におけるIC搭載基板の構成を断面視で示す構成図、図4は、その製造方法における主要な行程を断面視で示す行程図である。
図3に示すように、本実施形態のIC搭載基板1は、第一実施形態と比較して、多層プリント配線板2の構成が主に異なるため、この相違点を中心に説明し、その他の共通する部分については説明を省略する。
次に、本実施形態のIC搭載基板1の製造方法Bにおける主要な行程を説明する。
なお、この製造方法Bは、前述した製造方法Aと比較して、プレス基板9の作製行程でチップ部品4等を内蔵させる点が主に異なるため、この相違点を中心に説明し、その他の共通する部分については説明を省略する。
具体的にプレス基板9の作製行程i),ii)では、レーザ装置などを用いて、2層目および3層目の絶縁層20に第一のキャビティを、3層目〜5層目の絶縁層20に第二のキャビティをそれぞれ設け、第一のキャビティに銅部材6を、第二のキャビティにチップ部品4を挿入するようにして、配線パターン10が形成された七層分の各絶縁層20を、積層プレス等により加熱加圧しにより接着させる。なお、6層目の絶縁層のうちチップ部品4の実装位置に対応する領域には、チップ部品4を電気的に接続するためのビア7が少なくとも設けられている。
以上、説明したように、本実施形態のIC搭載基板1によれば、多層プリント配線板2の絶縁層20にPTFEが用いられているため、一般的に用いられるガラスエポキシ樹脂に比べて誘電正接が小さく、誘電体損失を抑制することができるため、ミリ波等の高周波信号を扱う機器に好適に使用することができる。
次に、本発明の第三実施形態を図面と共に説明する。
図5は、第三実施形態におけるIC搭載基板の構成を断面視で示す構成図、図6は、その製造方法における主要な行程を断面視で示す行程図である。
図5に示すように、本実施形態のIC搭載基板1は、第一実施形態と比較して、ベアチップ3と多層プリント配線板2との接続方法が主に異なるため、この相違点を中心に説明し、その他の共通する部分については説明を省略する。
また、図6に示すように、本実施形態のIC搭載基板1の製造方法は、第一実施形態の製造方法Aと比較して、プレス基板9の作製行程でキャビティを一箇所のみ設ける点、及びIC搭載基板1の作製行程でフリップチップ接続する点が異なるため、この相違点を中心に説明し、その他の共通する部分については説明を省略する。
このIC搭載基板1の製造方法によれば、導体ワイヤ5を介することなくベアチップ3を多層プリント配線板2に接続するため、ベアチップ3の実装面積を小さくすることができると共に、両者の接続部の長さを必要最小限に抑えることにより、この方法で製造されたIC搭載基板1の電気的特性を向上させることができる。
以上、本発明の実施形態について説明したが、本発明は上記実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲において、様々な態様にて実施することが可能である。
Z=(120π/εeff1/2)/{W/h+1.393+ln(W/h+1.444)} ・・・(1)
但し、εeff=(εr+1)/2+(εr−1)/2(1+12h/W)1/2
に基づいて設定されればよい。例えば、Z=50Ω、εr=3.5、W=300μmである場合、h≒135μmとなるため、各絶縁層20の厚みを約67.5μmとすることが考えられる。
Claims (6)
- 絶縁材からなる絶縁層上に配線パターンが形成され、前記絶縁層および前記配線パターンが複数積層されてなる多層プリント配線板と、ICのベアチップとが電気的に接続されたIC搭載基板であって、
前記多層プリント配線板は、前記配線パターンと前記ベアチップとを電気的に接続するための部位を電極部とし、複数の前記絶縁層のうち、前記電極部が形成された絶縁層を一層目、該一層目の絶縁層に前記電極部の反対側から積層された絶縁層を二層目として、前記一層目の絶縁層において前記電極部を含む側の第一面上、前記一層目と前記二層目とが重なる第二面上、及び、前記二層目の絶縁層において前記一層目に対する反対側の第三面上に前記配線パターンがそれぞれ形成され、
前記複数の絶縁層は、前記一層目を除き、且つ前記二層目を含む複数の絶縁層に渡って前記電極部に対向する直下領域に、少なくとも前記絶縁材に比べて剛性の高い強化材、及び、前記第二面上の配線パターンと前記第三面上の配線パターンとを接続するビアが埋設され、
前記複数の配線パターンは、線路パターンとグランドパターンとの組合せからなるマイクロストリップ線路により形成され、
前記複数の絶縁層は、前記第一面上に前記線路パターンが形成されるとともに、前記第二面上及び前記第三面上に前記グランドパターンがそれぞれ形成され、
前記第二面上のグランドパターンは、前記直下領域に相当する領域にのみ形成されていることを特徴とするIC搭載基板。 - 前記絶縁材は、熱可塑性樹脂であることを特徴とする請求項1に記載のIC搭載基板。
- 前記直下領域は、前記電極部に対応して複数設けられていることを特徴とする請求項1または請求項2に記載のIC搭載基板。
- 前記多層プリント配線板は、複数の前記絶縁層のうち、前記一層目の絶縁層の厚みが、他の絶縁層の厚みに比べて小さいことを特徴とする請求項1ないし請求項3のいずれかに記載のIC搭載基板。
- 前記絶縁材は、前記配線パターンと同じ線膨張係数となるように予め補填材が含まれ、
前記強化材は、前記配線パターンと同じ線膨張係数を有する材質であることを特徴とする請求項1ないし請求項4のいずれかに記載のIC搭載基板。 - 絶縁材からなる絶縁層上に配線パターンが形成され、前記絶縁層および前記配線パターンが複数積層されてなる多層プリント配線板であって、
前記配線パターンとICのベアチップとを電気的に接続するための電極部を備え、
複数の前記絶縁層のうち、前記電極部が形成された絶縁層を一層目、該一層目の絶縁層に前記電極部の反対側から積層された絶縁層を二層目として、前記一層目の絶縁層において前記電極部を含む側の第一面上、前記一層目と前記二層目とが重なる第二面上、及び、前記二層目の絶縁層において前記一層目に対する反対側の第三面上に前記配線パターンがそれぞれ形成され、
前記複数の絶縁層は、前記一層目を除き、且つ前記二層目を含む複数の絶縁層に渡って前記電極部に対向する直下領域に、少なくとも前記絶縁材に比べて剛性の高い強化材、及び、前記第二面上の配線パターンと前記第三面上の配線パターンとを接続するビアが埋設され、
前記複数の配線パターンは、線路パターンとグランドパターンとの組合せからなるマイクロストリップ線路により形成され、
前記複数の絶縁層は、前記第一面上に前記線路パターンが形成されるとともに、前記第二面上及び前記第三面上に前記グランドパターンがそれぞれ形成され、
前記第二面上のグランドパターンは、前記直下領域に相当する領域にのみ形成されていることを特徴とする多層プリント配線板。
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DE102010002540A DE102010002540A1 (de) | 2009-03-09 | 2010-03-03 | Platine, IC-Karte mit der Platine und Herstellungsverfahren hierfür |
US12/660,824 US20100226110A1 (en) | 2009-03-09 | 2010-03-04 | Printed wiring board, printed IC board having the printed wiring board, and method of manufacturing the same |
CN201010129308A CN101835343A (zh) | 2009-03-09 | 2010-03-09 | 印刷布线板、包含其的印刷集成电路板及其制造方法 |
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US10818567B2 (en) * | 2018-12-07 | 2020-10-27 | Google Llc | Integrated circuit substrate for containing liquid adhesive bleed-out |
CN112349695B (zh) * | 2020-09-28 | 2022-04-19 | 中国电子科技集团公司第二十九研究所 | 一种四层布线lcp封装基板、制造方法及多芯片系统级封装结构 |
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JPS60140897A (ja) * | 1983-12-28 | 1985-07-25 | 日本電気株式会社 | 樹脂絶縁多層基板 |
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US5031821A (en) * | 1988-08-19 | 1991-07-16 | Hitachi, Ltd. | Semiconductor integrated circuit device, method for producing or assembling same, and producing or assembling apparatus for use in the method |
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