JP4880561B2 - フリップチップ実装装置 - Google Patents
フリップチップ実装装置 Download PDFInfo
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- JP4880561B2 JP4880561B2 JP2007260070A JP2007260070A JP4880561B2 JP 4880561 B2 JP4880561 B2 JP 4880561B2 JP 2007260070 A JP2007260070 A JP 2007260070A JP 2007260070 A JP2007260070 A JP 2007260070A JP 4880561 B2 JP4880561 B2 JP 4880561B2
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- 239000004065 semiconductor Substances 0.000 claims description 51
- 239000000758 substrate Substances 0.000 claims description 30
- 238000009826 distribution Methods 0.000 claims description 26
- 238000003825 pressing Methods 0.000 claims description 14
- 230000010355 oscillation Effects 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 6
- 239000013307 optical fiber Substances 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 230000001678 irradiating effect Effects 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L24/81—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a bump connector
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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
- B23K1/005—Soldering by means of radiant energy
- B23K1/0056—Soldering by means of radiant energy soldering by means of beams, e.g. lasers, E.B.
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- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/03—Observing, e.g. monitoring, the workpiece
- B23K26/032—Observing, e.g. monitoring, the workpiece using optical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
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- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
- B23K26/0643—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising mirrors
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- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
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- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/0665—Shaping the laser beam, e.g. by masks or multi-focusing by beam condensation on the workpiece, e.g. for focusing
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- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
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Description
しかしながら、基板材料の樹脂と、半導体チップのシリコンとでは熱膨張係数に大きな差があることから、接合後基板の収縮によりバンプとパッドとの間で位置ずれが生じたり、接合部位にクラックが生じる不具合がある。
特に昨今では、高密度配線により、バンプやパッドが狭ピッチのパターンで形成されるので、上記位置ずれやクラックの問題が顕著に発生する。
そこで、最近では、加熱源にレーザー光を用い、短時間でかつ集中的な加熱を行って、上記不具合を解消しようとする方法も採用されている(特許文献1)。
すなわち、この特許文献1のものでは、半導体チップの裏面側からレーザー光を照射するためのレーザー発振器と、レーザー発振器から発せられたレーザー光のビームエキスパンダであるレンズと、レンズを透過したレーザー光をステージ上に配置された半導体チップのバンプ近傍に集中させる位相差板と、半導体チップをその裏面側から加圧すると共に、ガラスから形成されている加圧ツールとを備え、半導体チップのバンプ近傍のみにレーザー光を照射して加熱するというものである。
しかしながら、一般的に半導体チップの形状は矩形であり、また、拡径されたレーザー光は位相差板をもって強度分布を調整したとしても円形ビームであって、円形ビームで矩形の半導体チップを照射した場合には、半導体チップを外れたレーザー光が半導体チップ周辺の基板の部位を加熱することになり、熱収縮による位置ずれやクラックの発生を完全に無くするには至らない。
本発明は、上記課題を解消すべくなされ、その目的とするところは、熱収縮による位置ずれやクラックの発生を可及的に少なくできるフリップチップ実装装置を提供するにある。
また、少なくとも前記ビームエキスパンダー、前記押圧体が組み込まれたヘッド部と、該ヘッド部を上下動する上下動機構と、該ヘッド部を軸線を中心として回転させる回転駆動部と、前記ヘッド部の下方に配置され、基板が載置されるXYテーブルと、該XYテーブルを水平面内で移動する駆動部と、前記押圧体に保持された半導体チップのバンプ位置と、XYテーブル上に載置された基板のパッド位置とを検出するカメラ装置と、該カメラ装置の検出信号が入力され、検出結果に基づいて、半導体チップのバンプ位置と基板のパッドとを位置合わせする制御部とを具備することを特徴とする。
図1はフリップチップ実装装置10の要部を示す概要図、図2はフリップチップ実装装置10の全体の概要図である。
符号12はレーザー光発振源である。レーザーは特に限定されるものではなく、ガスレーザー、固体レーザー、半導体レーザーなどいずれでもよく、半導体チップのバンプと基板のパッドとの接合すべき部位をフリップチップ接続できる温度に加熱できるものであればよい。
レーザー光は可変形ミラー16で反射され、この反射レーザー光はセンサー18によって検出される。センサー18では、反射レーザー光の強度分布を出力電流として検出し、この検出信号を制御部20に入力する。
この可変形ミラー16は、ピエゾ素子22のそれぞれの両電極間に所要の電圧を印加し、これにより各リード24に対応するピエゾ素子22部分に異なる変形を付与することができるようになっていて、ピエゾ素子22部分に対応する反射面25に局所的な変形を生じさせ、制御部20により、所要のプログラムにしたがって、反射するレーザー光のビーム(の断面)形状やレーザー光の強度分布を調整可能となっている。すなわち、反射面25が微小エリアずつそれぞれ反射角度の調整が可能となっている。
図4はレーザー光発振源12で発せられたレーザー光の強度分布を示す模式図、図5は制御部20により調整がなされた反射レーザー光の強度分布を示す模式図、図6はビームエキスパンダー34によってビーム径が拡大された反射レーザー光の強度分布を示す模式図である。また、図7、図8はバンプ37の配置例(各図の(a))と、このバンプ37の配置例に合わせて調整された反射レーザー光の強度分布(各図の(b))を示す模式図である。
吸着ヘッド部40は、吸着孔38より図示しない吸引装置により空気が吸引されることで半導体チップ36を吸着保持可能となっている。
42は基板であり、43はバンプ37と同一のパターンで基板42に形成されたパッドである。
ヘッド部44はフリップチップ実装装置10に装着され(図2)、図示しない上下動機構によって上下動可能となっている。またヘッド部44は図示しない回転駆動部によって軸線を中心として所用角度範囲内で回転可能となっている。
ヘッド部44の下方にはXYテーブル46が配置され、図示しない駆動部によりX軸方向、Y軸方向に移動可能となっている。
XYテーブル46上には基板42が載置される。
48は上下方向をモニターし、バンプ37とパッド43を位置合わせするためのカメラ装置であり、ヘッド部44とXYテーブル46との間に進退可能に配置されている。
ヘッド部44は、XYテーブル46の上方に上昇されている。
XYテーブル46上に基板42を配置する。
また、ヘッド部44の吸着ヘッド部40に半導体チップ36をその裏面側で吸着保持させる。
次いでカメラ装置48は、ヘッド部44とXYテーブル46の間から外れる位置に退避する。
この状態でレーザー発振源12によりレーザー光が発せられ、光ファイバーケーブル14を通じて可変形ミラー16に入光される。
可変形ミラー16で反射された反射レーザー光はセンサー18で検出され、検出信号が制御部20に入力される。センサー18での検出は、反射ビーム光の断面における強度分布として検出する。
半導体チップ36の基板42へのフリップチップ接続が行われた後、吸着ヘッド部40による半導体チップ36の吸着が解除され、ヘッド部44が上昇して接合が終了する。なお、半導体チップ36と基板42との間の隙間には適宜アンダーフィル樹脂が充填される。
12 レーザー光発振源
14 光ファイバーケーブル
16 可変形ミラー
18 センサー
20 制御部
22 ピエゾ素子
23 孔
24 リード
25 反射面
26 共通電極
30 光ファイバーケーブル
32 ミラー
33、35 レンズ
34 ビームエキスパンダー
36 半導体チップ
37 バンプ
38 吸着孔
40 吸着ヘッド部
42 基板
43 パッド
44 ヘッド部
46 XYテーブル
48 カメラ装置
Claims (3)
- レーザー光発振源と、
該レーザー光発振源で発せられたレーザー光が入光され、該レーザー光の径を拡大するビームエキスパンダーと、
該ビームエキスパンダーで拡大されたレーザー光を透過すると共に半導体チップのバンプを基板のパッドに押圧する押圧体とを具備し、半導体チップを基板にフリップチップ接続するフリップチップ実装装置において、
反射面が微小エリアずつそれぞれ角度調整が可能であって、前記レーザー光発振源で発せられたレーザー光が入光される可変形ミラーと、
該可変形ミラーからの反射レーザー光を検出するセンサーと、
該センサーからの検出信号が入力され、あらかじめ入力された設定値と比較することにより、前記可変形ミラーからの反射レーザー光が前記ビームエキスパンダー、前記押圧体を通じて半導体チップに照射される際、反射レーザー光のビーム形状が半導体チップの外形に沿い、かつ接合部を集中的に加熱するように、反射レーザー光の強度分布が半導体チップのバンプの分布に応じた強度分布となるように可変形ミラーを制御する制御部とを具備することを特徴とするフリップチップ実装装置。 - 前記押圧体は、半導体チップを吸着保持可能となっていることを特徴とする請求項1記載のフリップチップ実装装置。
- 少なくとも前記ビームエキスパンダー、前記押圧体が組み込まれたヘッド部と、
該ヘッド部を上下動する上下動機構と、
該ヘッド部を軸線を中心として回転させる回転駆動部と、
前記ヘッド部の下方に配置され、基板が載置されるXYテーブルと、
該XYテーブルを水平面内で移動する駆動部と、
前記押圧体に保持された半導体チップのバンプ位置と、XYテーブル上に載置された基板のパッド位置とを検出するカメラ装置と、
該カメラ装置の検出信号が入力され、検出結果に基づいて、半導体チップのバンプ位置と基板のパッドとを位置合わせする制御部とを具備することを特徴とする請求項2記載のフリップチップ実装装置。
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