JP2006514428A - 液体の形状を使用して基板の特性を求める方法及びシステム - Google Patents
液体の形状を使用して基板の特性を求める方法及びシステム Download PDFInfo
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Abstract
Description
(1) d=V/A
ここで、AはCCDセンサ23で測定される液体で満たされた面積である。そのために、CCDセンサ23と波形整形光学素子24の組合せは、検出システムに区域22内の1つ又は複数のビード36を検知させる。第1の基板26をウェハ30から間隔を開けることによって、1つ又は複数のビード36のボリュームは、各ビード36にそれに関連する面積40を与える。距離「d」が減少し、基板26がビード36と機械的に接触すると圧縮が起きる。この圧縮はビード36の面積40の特性に、変化した特性と呼ばれる変化を引き起こす。これらの変化は、面積の形状、サイズ又は対称性などの1つ又は複数のビード36の幾何学的形状に関する。この例では、変化した特性は42として示されており、その面積のサイズと関係する。具体的には、圧縮は結果的にビード36の面積の拡大となる。
(2) d=V/tp(Pa)
ここで、tpはN×M配列中のピクセルの総数であり、Paは各ピクセルの面積である。
(3) ΔA=(A/d)Δd
CCDセンサ23によって検知される1つのビード36の全ボリュームvが200nl、すなわち0.1mm3かつd=200nmであると仮定すると、液体が満たされた面積は1000mm2になる。等式(3)から、CCDセンサ23の所望の解像度は5mm2であると求めることができる。
(4) Δd=|LT−LS|
時間t1、t2の間に、1つ又は複数のビード36の面積の変化を、1つ又は複数のビード36が検知されるピクセルの総数の関数として求めるために、CCDセンサ23による測定が行われる。時間t1において、1つ又は複数のビード36が検知されたピクセルの総数はnp1である。時間t2において、1つ又は複数のビード36が検知されたピクセルの総数はnp2である。これらの2つの値から、ピクセルの変化Δnpは以下で定義される。
(5) Δnp=|np2−np1|
等式4及び5から、距離dの値は以下の等式のいずれかから求められる。
(6) d1=(Δd/Δnp)np1
(7) d2=(Δd/Δnp)np2
ここで、d=d1=d2である。d1とd2を知れば、置き換えによって、我々はCCDセンサ23によって検知された1つ又は複数のビードのボリュームを以下の等式のいずれかによって求めることができる。
(8) V1=d1(np1×ピクセルサイズ)
(9) V2=d2(np2×ピクセルサイズ)
ここで、V=V1=V2、及び(np1×ピクセルサイズ)=(np2×ピクセルサイズ)=Aである。第1の基板26とウェハ30を平行に保持することができるときは、干渉計98は、図1に示すように区域22の外側で測定することができる。そうでない場合は、干渉計測定は区域22の中央又は延びているビードに近接して行うべきである。このようにして、図1に示すシステム10を使用して得られる基板特性情報は、図12に示すシステム110を使用して得ることができる。
Claims (24)
- 液体のボリュームであって、前記ボリュームと関連する面積を有する液体の前記ボリュームを第2の基板上に形成する段階と、
液体の前記ボリュームを前記第1と第2の基板間で圧縮し、前記面積の性状に変化を引き起こさせ、変化した性状の意味を明らかにする段階と、
前記変化した性状を検知する段階と、
前記変化した性状の関数として前記第1と第2の基板の特性を求め、測定された特性の意味を明らかにする段階とを含む、第1と第2の基板の特性を求める方法。 - 前記性状が、サイズ、形状、対称性を含む1組の幾何学的形状から選択された幾何学的形状である請求項1に記載の方法。
- 前記性状が前記第2の基板の所定の位置への前記液体の拡張を含む請求項1に記載の方法。
- 液体の前記ボリュームを形成する段階が、前記第2の基板上に前記液体の第1と第2の間隔を開けて液滴を堆積させる段階をさらに含み、前記ボリュームを圧縮する段階が、前記第1と第2の液滴の1つの幾何学的形状に変化を起こさせるように前記第1と第2の液滴を圧縮する段階をさらに含む請求項1に記載の方法。
- 前記第1の液滴がそれと関連する第1の幾何学的形状を有し、かつ前記第2の液滴がそれと関連する第2の幾何学的形状を有し、液体の前記ボリュームを形成する段階が、前記第2の基板上に前記液体の第1と第2の間隔を開けて液滴を堆積させる段階を含み、前記ボリュームを圧縮する段階が、前記第1の幾何学的形状に変化を起こさせるように前記第1と第2の液滴を圧縮し、変化した幾何学的形状の意味を明らかにする段階をさらに含み、かつ、前記変化した幾何学的形状を前記第2の幾何学的形状とその間の変化を求めるために比較し、変化の意味を明らにする段階をさらに含み、前記特性を求める段階が前記変化の関数として前記特性を求める段階をさらに含む請求項1に記載の方法。
- 特性を求める段階が、前記第1と第2の基板間の距離を求める段階をさらに含む請求項1に記載の方法。
- 特性を求める段階が、前記第1と第2の基板が互いに平行に延びているかどうかを求める段階をさらに含む請求項1に記載の方法。
- 前記第1の基板が第1の平面内にあり、前記第2の基板が前記第1の平面とある角度をなす第2の平面内にあり、前記特性を求める段階が前記角度を求める段階をさらに含む請求項1に記載の方法。
- 前記変化した性状を検知する段階が、液体の前記ボリュームを圧縮する前に前記ボリュームが配置された前記第2の基板の区域の第1の画像を取得し、かつ液体の前記ボリュームを圧縮した後で前記区域の第2の画像を取得し、液体の前記ボリュームと関連する前記第1と第2の画像内の情報を比較する段階とをさらに含む請求項1に記載の方法。
- 前記特性が、汚染物の存在、空間的関係、形状からなる1組の特性から選択される請求項1に記載の方法。
- 所望の空間的関係を得るため、前記測定された空間的関係に応答して前記第1と第2の基板間の前記空間的関係を調整する段階をさらに含む請求項10に記載の方法。
- 液体のボリュームであって、前記ボリュームと関連する面積を有する液体の前記ボリュームを第2の基板上に形成する段階と、
液体の前記ボリュームを前記第1と第2の基板間で圧縮し、前記面積の性状に変化を引き起こさせ、変化した性状の意味を明らかにする段階であって、前記性状はサイズ、形状、対称性を含む1組の性状から選択される段階と、
前記変化した性状を検知する段階と、
前記変化した性状の関数として前記第1と第2の基板の特性を求め、測定された特性の意味を明らかにする段階であって、空間的関係が前記第1と第2の平面間の距離と前記第1と第2の平面間に形成された角度を含む1組の関係から選択される段階とを含む、第1の平面内にある第1の基板と第2の平面内にある第2の基板間の空間的関係を求める方法。 - 液体の前記ボリュームを形成する段階が、前記第2の基板上に前記液体の第1と第2の間隔を開けて液滴を堆積させる段階をさらに含み、前記ボリュームを圧縮する段階が、前記第1の液滴の面積に変化を起こさせるように前記第1と第2の液滴を圧縮し、変化した第1の面積の意味を明らかにする段階をさらに含み、かつ、前記変化した第1の面積を前記第2の液滴の面積とその間の変化を求めるために比較し、変化の意味を明らにする段階をさらに含み、前記空間的関係を求める段階が、前記変化の関数として前記第1と第2の基板間の前記空間的関係を求める段階をさらに含む請求項12に記載の方法。
- 前記変化した性状を検知する段階が、液体の前記ボリュームを圧縮する前に前記ボリュームが配置された前記第2の基板の区域の第1の画像を取得し、かつ液体の前記ボリュームを圧縮した後で前記区域の第2の画像を取得し、液体の前記ボリュームと関連する前記第1と第2の画像内の情報を比較する段階とをさらに含む請求項12に記載の方法。
- 所望の空間的関係を得るため、前記測定された空間的関係に応答して前記第1と第2の基板間の前記空間的関係を調整する段階を含む請求項13に記載の方法。
- 第1の平面内にある第1の基板の特性と、第2の平面内にある、その上に置かれた液体のボリュームを有する第2の基板の特性を求めるためのシステムにおいて、
前記第1と第2の基板間の距離を変化させる変位機構であって、前記距離はギャップであり、液体の前記ボリュームはそのボリュームと関連する面積を有し、前記変位機構は前記面積の性状に変化を起こさせるように前記第1と第2の基板間の液体の前記ボリュームを圧縮し、変化した特性の意味を明らかにするようになされた変位機構と、
前記変化した性状を検知し、それに応答するデータを発生する検出システムと、
前記データを受信し、前記第1と第2の基板間の空間的関係に対応する情報を前記変化した性状の関数として発生させ、測定された空間的関係の意味を明らかにするプロセッシング・システムとを備える、システム。 - 前記特性が、汚染物の存在、空間的関係、形状からなる1組の特性から選択される請求項16に記載のシステム。
- 前記性状が、サイズ、形状、対称性を含む1組の幾何学的形状から選択された幾何学的形状である請求項16に記載のシステム。
- 前記性状が前記第2の基板の所定の位置への前記液体の拡張を含む請求項16に記載のシステム。
- 前記変位機構が前記情報を受けるように接続され、所望の空間的関係を得るため前記情報に応答して前記第1と第2の基板間の前記空間的関係を調整する請求項16に記載のシステム。
- 前記検出システムが、前記第1と第2の基板のうちの1つの所定の位置に液体の前記ボリュームが存在することを検知する終点検出システムをさらに含む請求項17に記載のシステム。
- 液体の前記ボリュームが前記第2の基板上に配置された前記液体の第1と第2の間隔を開けた液滴をさらに含み、前記変位機構が前記第1と第2の液滴の1つの幾何学的形状に変化を起こさせるように前記第1と第2の液滴の1つを圧縮するようになされ、前記検出システムがCCDセンサを含む請求項17に記載のシステム。
- 液体の前記ボリュームが、それと関連する第1の幾何学的形状を有する第1の液滴、とそれと関連する第2の幾何学的形状を有する第2の液滴をさらに含み、前記第1と第2の液滴が前記第2の基板上に間隔を開け配置され、前記変位機構が前記第1と第2の幾何学的形状に変化を起こさせるように前記第1と第2の液滴を圧縮し、変化した第1の幾何学的形状と変化した第2の幾何学的形状の意味を明らかにするようになされており、前記プロセッサは、その間の相違を求めるために前記変化した第1と第2の幾何学的形状を比較するように接続され、差異の意味を明らかにし、前記特性を前記差異の関数として求める請求項16に記載の方法。
- 前記検出システムが、前記第1と第2の基板間の距離を求めるための干渉計をさらに含む請求項17に記載のシステム。
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Also Published As
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US7036389B2 (en) | 2006-05-02 |
JP4563182B2 (ja) | 2010-10-13 |
CN100485350C (zh) | 2009-05-06 |
US6871558B2 (en) | 2005-03-29 |
EP2418544A2 (en) | 2012-02-15 |
US20050028618A1 (en) | 2005-02-10 |
EP2418544A3 (en) | 2012-04-04 |
US20040223883A1 (en) | 2004-11-11 |
AU2003302248A1 (en) | 2004-07-09 |
EP1570249B1 (en) | 2012-10-03 |
KR20050085630A (ko) | 2005-08-29 |
KR101141560B1 (ko) | 2012-05-03 |
EP1570249A4 (en) | 2009-03-25 |
WO2004055594A2 (en) | 2004-07-01 |
EP1570249A2 (en) | 2005-09-07 |
US6990870B2 (en) | 2006-01-31 |
WO2004055594A3 (en) | 2004-12-23 |
AU2003302248A8 (en) | 2004-07-09 |
US20040112153A1 (en) | 2004-06-17 |
EP2418544B1 (en) | 2016-11-02 |
CN1739015A (zh) | 2006-02-22 |
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