JP2021010936A - レーザ加工装置 - Google Patents
レーザ加工装置 Download PDFInfo
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- JP2021010936A JP2021010936A JP2019127514A JP2019127514A JP2021010936A JP 2021010936 A JP2021010936 A JP 2021010936A JP 2019127514 A JP2019127514 A JP 2019127514A JP 2019127514 A JP2019127514 A JP 2019127514A JP 2021010936 A JP2021010936 A JP 2021010936A
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- 238000012545 processing Methods 0.000 title claims abstract description 50
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- 238000003754 machining Methods 0.000 claims description 19
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- 238000005259 measurement Methods 0.000 description 7
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- 230000015572 biosynthetic process Effects 0.000 description 3
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- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/50—Working by transmitting the laser beam through or within the workpiece
- B23K26/53—Working by transmitting the laser beam through or within the workpiece for modifying or reforming the material inside the workpiece, e.g. for producing break initiation cracks
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- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
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- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
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- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
- B23K2103/56—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26 semiconducting
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Abstract
Description
Defocus=(被加工物の厚み−高さ値−b)/a・・(1)
該算出部は、該集光レンズの集光点を被加工物の上面から段階的に下げながら、高さの違う少なくとも2点に該集光レンズを位置づけて、被加工物に、深さの異なる少なくとも2つの改質層を形成し、改質層から被加工物の上面までの距離(Depth)を縦軸とし、該集光レンズの高さ位置(Defocus)を横軸とする座標系に、該少なくとも2つの改質層に対応する点をプロットし、各改質層に対応する点を通る近似直線の以下の(2)式で示される一次関数における、傾きとしての定数aおよび切片としての定数bを求め、
Depth=a×Defocus+b・・(2)
この(2)式を、改質層から被加工物の上面までの距離(Depth)に関する以下の(3)式に適用することにより、前記(1)式を求め、
Depth=被加工物の厚み−高さ値・・(3)
該設定部によって設定された被加工物の下面からの高さ位置に改質層を形成する。
なお、ウェーハ1の上面高さは、たとえば、X軸テーブル32あるいは基台11の上面からウェーハ1の上面までの高さを意味する。
集光器181は、レーザ発振器および集光レンズを備えており、チャックテーブル43に保持されたウェーハ1の内部に、ウェーハ1に対して透過性を有する波長のレーザ光線を集光させる。アクチュエータ182は、チャックテーブル43に保持されたウェーハ1に対する集光器181(集光レンズ)の高さを調整する。すなわち、アクチュエータ182は、集光器181(集光レンズ)をチャックテーブル43の保持面43aに垂直な方向に移動させる昇降手段の一例である。
このような構成を有する加工手段18は、レーザ光線を集光レンズで集光させた集光点を、ウェーハ1の内部に位置づけて、この集光点によってウェーハ1の内部に改質層を形成する。
レーザ加工装置10では、制御手段61の制御により、ウェーハ1に対して透過性を有する波長のレーザ光線を集光させた集光点を、ウェーハ1の内部に位置づけて、分割予定ラインMに沿って加工送りする。これによって、ウェーハ1の内部に改質層を形成する。
この制御に関し、まず、図4に示した制御手段61の設定部63が、図5(a)に示すように、ウェーハ1の内部における下面LSから所定の高さ位置Pに改質層を形成するために、この所定の高さ位置Pにおけるウェーハ1の下面LSからの高さ値H1を設定する。
この高さ値H1の設定は、たとえば、作業者によって指定された値に従って実施される。
Defocus=(ウェーハ1の厚みT1−高さ値H1−b)/a・・(1)
この場合、改質層の形成時では、集光点Cはウェーハ1の内部に配置されるため、集光レンズ183の高さ位置(Defocus)は、基準位置よりも低くなり、マイナスの値となる(図5(b)参照)。
Depth=a×Defocus+b・・(2)
Depth=ウェーハ1の厚み−高さ値H1・・(3)
Depth(y)=−4.1985×Defocus(x)+36.519・・(2a)
Defocus=−(ウェーハ1の厚みT1−高さ値H1−36.519)/4.1985・・(1a)
そして、形成される改質層の深さ(Depth)が異なる場合、ウェーハ1の材質が同様であっても、上述した(1)式に用いられるべき適切な定数aおよび定数bが異なる場合もある。
Depth(y)=−4.3377×Defocus(x)+33.791・・(2b)
Depth(y)=−4.1372×Defocus(x)+42.902・・(2c)
さらに、1つのウェーハ1の加工中における、加工送り位置の変化に応じたウェーハ1の厚みT1およびチャックテーブル43の保持面43aの高さの変化が小さい場合、レーザ加工装置10は、厚み測定手段16および上面高さ測定手段17を備えなくてもよい。
10:レーザ加工装置、11:基台、13:立壁部、
14:チャックテーブル移動機構、15:アーム部、
20:割り出し送り部、30:加工送り部、50:昇降部材、
43:チャックテーブル、43a:保持面
61:制御手段、62:記憶部、63:設定部、64:算出部、
12:レーザユニット、16:厚み測定手段、17:上面高さ測定手段、
18:加工手段、181:集光器、182:アクチュエータ、183:集光レンズ
Claims (2)
- 被加工物に対して透過性を有する波長のレーザ光線を集光レンズで集光させた集光点を、被加工物の内部に位置づけて、該集光点によって被加工物の内部に改質層を形成する加工手段と、被加工物を保持する保持面を有する保持手段と、該保持手段と該加工手段とを相対的に該保持面に平行な方向に加工送りする加工送り手段と、該集光レンズを該保持面に垂直な方向に移動させる昇降手段と、制御手段と、を備えるレーザ加工装置であって、
被加工物の内部における下面から所定の高さ位置に改質層を形成するために、該所定の高さ位置の下面からの高さ値を設定する設定部と、
該設定部によって設定された該高さ値と、定数aおよび定数bを含む以下の(1)式とを用いて、該集光レンズの高さ位置(Defocus)を算出する算出部と、をさらに備え、
Defocus=(被加工物の厚み−高さ値−b)/a・・(1)
該算出部は、
該集光レンズの集光点を被加工物の上面から段階的に下げながら、高さの違う少なくとも2点に該集光レンズを位置づけて、被加工物に、深さの異なる少なくとも2つの改質層を形成し、
改質層から被加工物の上面までの距離(Depth)を縦軸とし、該集光レンズの高さ位置(Defocus)を横軸とする座標系に、該少なくとも2つの改質層に対応する点をプロットし、
各改質層に対応する点を通る近似直線の以下の(2)式で示される一次関数における、傾きとしての定数aおよび切片としての定数bを求め、
Depth=a×Defocus+b・・(2)
この(2)式を、改質層から被加工物の上面までの距離(Depth)に関する以下の(3)式に適用することにより、前記(1)式を求め、
Depth=被加工物の厚み−高さ値・・(3)
該設定部によって設定された被加工物の下面からの高さ位置に改質層を形成する、レーザ加工装置。 - 前記算出部は、前記(1)式に用いられる該定数aおよび該定数bを、改質層から被加工物の上面までの距離(Depth)に応じて切り換える、
請求項1記載のレーザ加工装置。
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