JP6587107B2 - 回路部材の接続方法 - Google Patents
回路部材の接続方法 Download PDFInfo
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- JP6587107B2 JP6587107B2 JP2016096269A JP2016096269A JP6587107B2 JP 6587107 B2 JP6587107 B2 JP 6587107B2 JP 2016096269 A JP2016096269 A JP 2016096269A JP 2016096269 A JP2016096269 A JP 2016096269A JP 6587107 B2 JP6587107 B2 JP 6587107B2
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- pressure
- circuit member
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
- B23K1/0016—Brazing of electronic components
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- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
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Description
(第1工程)
本工程では、接着剤および接着剤に分散するはんだ材料を含む接続材料を準備する。接続材料は、ペースト状でもよく、フィルム状でもよい。
接着剤は、熱硬化性樹脂および/または熱可塑性樹脂を含む樹脂組成物である。中でも、熱硬化性樹脂を含む樹脂組成物が好ましく、熱硬化性樹脂はエポキシ樹脂を含むことが好ましい。樹脂組成物は、熱硬化性樹脂の硬化剤を含んでもよい。硬化剤としては、アミン、フェノール樹脂、酸無水物などが挙げられる。樹脂組成物は、更に、種々の添加剤を含んでもよい。添加剤としては、はんだ材料や電極表面の酸化被膜を除去する活性剤、フィラー、硬化促進剤などが挙げられる。
はんだ材料は、特に限定されず、例えば、錫、銀、ビスマス、インジウム、ニッケル、亜鉛、銅などを含み、これらの元素を含む合金として、錫−銀−銅合金、錫−ビスマス合金、錫−インジウム合金、錫−亜鉛合金、ビスマス−インジウム合金、錫−ビスマス−インジウム合金などをはんだ材料に用いることができる。中でも、はんだ材料は、ビスマス−インジウム合金を含むことが好ましい。ビスマスおよびインジウムを含むはんだ材料は、比較的柔らかく、例えばビッカース硬さは20Hv未満であるため、第1圧力付与工程ではんだ材料を押圧する際に電極とのアンカー効果が得られ易い。
本工程は、第1電極を有する第1回路部材と、第2電極を有する第2回路部材とを準備する第2a工程と、接続材料を介して第1電極と第2電極とが対向するように、第1回路部材と第2回路部材とを配置する第2b工程とを含む。
例えば、所定のピッチで配列している複数の第1電極を備えた第1主面を有する第1回路部材と、所定のピッチで配列している複数の第2電極を備えた第2主面を有する第2回路部材とを準備する。
第1回路部材は、特に限定されないが、例えば、テレビ、タブレット、スマートフォン、ウェアラブルデバイス等が具備する表示パネルに用いられる透明基板であり得る。透明基板は、半透明であってもよい。透明基板としては、ガラス基板およびフィルム状基板が挙げられる。フィルム状基板は、透明性を有する樹脂フィルムで形成されている。透明性を有する樹脂フィルムとしては、ポリエチレンテレフタレート(PET)、ポリカーボネート(PC)、ポリエチレンナフタレート(PEN)等のフィルムであり得る。
第2回路部材は、特に限定されないが、例えば半導体チップ、電子部品パッケージ、フィルム基板、コネクタ等であり得る。
第1電極および第2電極の少なくとも一方は、バンプを含んでもよい。このとき、バンプのビッカース硬さは、はんだ材料のビッカース硬さよりも大きいことが好ましい。これにより、第1圧力付与工程において、バンプと電極との間またはバンプ間において、溶融前のはんだ材料の粒子を容易に捕捉することができ、アンカー効果も得られやすい。ビッカース硬さは、JIS Z 2244に準拠した測定方法により求められる。
本工程では、接続材料を介して、第1電極と第2電極とが対向するように、第1回路部材と第2回路部材とを配置する。
例えば、所定のピッチで配列している複数の第1電極を備えた第1主面を有する第1回路部材と、所定のピッチで配列している複数の第2電極を備えた第2主面を有する第2回路部材とを用いる場合には、第1回路部材の第1主面の第1電極の少なくとも一部を覆う領域(以下、第1接続領域)に、接続材料を配置する。接続材料が未硬化または半硬化状態の熱硬化性樹脂や未硬化の光硬化性樹脂を含むペースト状であれば、印刷装置、ディスペンサ、インクジェットノズル等を用い、第1接続領域に接続材料を塗布すればよい。接続材料がフィルム状もしくはテープ状であれば、基材から所定形状に切り出された当該フィルムを剥がし、第1接続領域に圧着すればよい。このような操作は、例えば公知のテープ貼り付け装置により行われる。なお、第2回路部材の第2主面の第2電極の少なくとも一部を覆う領域(第2接続領域)に、接続材料を配置してもよく、第1および第2接続領域の両方に配置してもよい。これにより、第1回路部材と第2回路部材とが対向配置された積層構造が得られる。
本工程では、接続材料に熱を加えながら、第1回路部材と第2回路部材とを圧着する。第3工程では、例えば、押圧のためのツールを用いて、第2回路部材を第1回路部材に対して押圧してもよく、第1回路部材を第2回路部材に対して押圧してもよい。接続材料の加熱は、例えば、加熱のためのツールを用いて、第1回路部材および/または第2回路部材を加熱することで行われる。押圧のためのツールは加熱のためのツールを兼ねていてもよい。
第1圧力付与工程では、接続材料の温度がはんだ材料の融点に到達する前に、はんだ材料を第1圧力で押圧して変形させた後、はんだ材料を押圧する圧力を第1圧力よりも小さい第2圧力に変更する。
第2圧力付与工程では、はんだ材料を第2圧力で押圧しながら、接着材料をはんだ材料の融点以上に加熱して、はんだ材料を溶融させる。これにより、溶融したはんだ材料を電極間に濡れ拡がらせることができる。第1圧力付与工程では、電極間に十分な量のはんだ材料を確保しているため、電極間の接続面積が小さい場合でも、はんだ材料を電極間に十分に濡れ拡がらせることができる。
なお、接着剤が熱可塑性樹脂を含む場合、第2圧力付与工程における加熱温度は、熱可塑性樹脂が溶融する温度よりも高ければよい。
最大の第1圧力が印加されているときの接着剤(樹脂組成物)2は、ほとんど流動していない。よって、第1回路部材11の第1電極12と第2回路部材21のバンプ22(第2電極)との間に存在していたはんだ粒子3は、そのまま第1電極12とバンプ22との間に留まることができる。よって、第1電極12とバンプ22との接続面積が小さい場合でも、第1電極12とバンプ22との間に効率的にはんだ粒子3が捕捉される。
2、32 接着剤(樹脂組成物)
3、33 はんだ粒子
11、41 第1回路部材
12、42 第1電極
21、51 第2回路部材
22、52 バンプ
Claims (10)
- 接着剤および前記接着剤に分散するはんだ材料を含む接続材料を準備する第1工程と、
第1電極を有する第1回路部材と、第2電極を有する第2回路部材とを準備し、前記接続材料を介して前記第1電極と前記第2電極とが対向するように、前記第1回路部材と前記第2回路部材とを配置する第2工程と、
前記接続材料に熱を加えながら、前記第1回路部材と前記第2回路部材とを圧着する第3工程と、を含み、
前記接着剤が流動し始める温度は、前記はんだ材料の融点より高く、
前記第3工程は、前記接続材料の温度が前記はんだ材料の前記融点に到達する前に行われる第1圧力付与工程と、前記第1圧力付与工程に続く第2圧力付与工程とを有し、
前記第1圧力付与工程では、前記はんだ材料を第1圧力で押圧して変形させた後、前記はんだ材料を押圧する圧力を前記第1圧力よりも小さい第2圧力に変更し、
前記第2圧力付与工程では、前記接続材料を前記はんだ材料の前記融点以上で加熱するとともに、前記はんだ材料を前記第2圧力で押圧する、回路部材の接続方法。 - 前記第1圧力が、15MPa〜30MPaである、請求項1に記載の回路部材の接続方法。
- 前記第2圧力が、前記第1圧力の40%以下である、請求項1または2に記載の回路部材の接続方法。
- 前記接着剤は、熱硬化性樹脂を含み、
前記熱硬化性樹脂の硬化反応が開始される温度が、前記はんだ材料の融点より高い、請求項1〜3のいずれか1項に記載の回路部材の接続方法。 - 前記第1電極および前記第2電極の少なくとも一方は、バンプを含み、
前記バンプのビッカース硬さは、前記はんだ材料のビッカース硬さよりも大きい、請求項1〜4のいずれか1項に記載の回路部材の接続方法。 - 前記バンプのビッカース硬さは、20Hv以上であり、
前記はんだ材料のビッカース硬さは、20Hv未満である、請求項5に記載の回路部材の接続方法。 - 前記バンプは少なくとも表面に金を含む、請求項5または6に記載の回路部材の接続方法。
- 前記はんだ材料は、ビスマス−インジウム合金を含む、請求項1〜7のいずれか1項に記載の回路部材の接続方法。
- 前記ビスマス−インジウム合金中に含まれるビスマス量は27質量%〜68質量%である、請求項8に記載の回路部材の接続方法。
- 前記ビスマス−インジウム合金中に含まれるビスマス量は51質量%〜55質量%である、請求項8に記載の回路部材の接続方法。
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