JP7407964B2 - レーザ加工方法およびレーザ加工装置 - Google Patents
レーザ加工方法およびレーザ加工装置 Download PDFInfo
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Description
<レーザ加工装置>
図1は、実施形態1に係るレーザ加工装置の模式的な構成図である。このレーザ加工装置100は、レーザ装置110と、光学ヘッド120と、レーザ装置110と光学ヘッド120とを接続する光ファイバ130と、制御装置140と、を備えている。
つぎに、レーザ加工装置100を用いたレーザ加工方法の一例を、レーザ切断の場合を例として説明する。
実施形態1のレーザ加工装置100と同じ構成のレーザ加工装置を作製し、金属箔からなる加工対象の切断実験を行った。加工対象は厚さ8μmの銅箔1枚とした。そして、各指示値での定常状態での平均パワーが1000Wとなるように駆動電力を設定した。駆動電力のパルスの繰り返し周波数は5kHz未満から300kHzまでの間の様々な値に設定した。また、駆動電力のパルスのオン時間は0.5μsから100μsまでの間の様々な値に設定した。
図8は、実施形態2に係るレーザ加工装置の模式的な構成図である。本実施形態では、光学ヘッド120は、コリメートレンズ121と集光レンズ122との間に、ガルバノスキャナ126を有している。ガルバノスキャナ126は、二つのミラー126aを有している。これら二つのミラー126aの姿勢の変化により、レーザ光Lの照射方向および照射位置が変化する。すなわち、レーザ加工装置100Aは、光学ヘッド120を移動させることなく、レーザ光Lの照射位置を移動させ、レーザ光Lを掃引することができる。制御装置140は、ミラー126aの角度(姿勢)が変化するよう、各ミラー126aに対応するモータ126bの作動を制御することができる。本実施形態によっても、実施形態1と同様の作用および効果が得られる。
2、9、130 :光ファイバ
3、8 :光合波器
5 :増幅用光ファイバ
11 :出力光ファイバ
20 :駆動部
21 :電源装置
22 :FET
23 :シャント抵抗
24 :オペアンプ
25 :フィードバック回路
100、100A :レーザ加工装置
110 :レーザ装置
120 :光学ヘッド
121 :コリメートレンズ
122 :集光レンズ
126 :ガルバノスキャナ
126a :ミラー
126b :モータ
140 :制御装置
CC :連続光成分
L :レーザ光
PC :パルス光成分
SD :掃引方向
TW :時間幅
W :加工対象
Wa :表面
Claims (11)
- 少なくとも1枚の金属箔からなる加工対象をレーザ加工する方法であって、
半導体レーザを含む励起光源にパルス状の電力を供給し、パルス状の励起光を発生させるステップと、
光ファイバレーザの増幅用光ファイバに前記励起光を供給し、光励起によりレーザ光を発生させるステップと、
前記加工対象の表面に前記レーザ光を照射するステップと、
を含み、
前記レーザ光は、前記レーザ光の発生の初期に、前記光ファイバレーザにおける緩和振動発振に起因して発生するパルス光成分と、前記パルス光成分よりも時間的に後に続く、連続光成分とを含み、
前記パルス光成分のエネルギーに対する前記連続光成分のエネルギーの比が所定値以下になるように、前記連続光成分の持続時間を制限するステップをさらに含む
レーザ加工方法。 - 前記比が40以下である
請求項1に記載のレーザ加工方法。 - 前記比が5以下である
請求項2に記載のレーザ加工方法。 - 前記レーザ光の時間幅が12μs以下である
請求項1~3のいずれか一つに記載のレーザ加工方法。 - 前記時間幅が2.3μs以下である
請求項4に記載のレーザ加工方法。 - 前記電力のパルスは矩形状であって、時間幅が10μs以下である
請求項1~5のいずれか一つに記載のレーザ加工方法。 - 前記電力のパルスは矩形状であって、時間幅が最短オン時間以上に設定され、
前記最短オン時間は、前記時間幅が当該最短オン時間よりも狭いと前記パルス光成分のピークパワーが減少する値である
請求項1~6のいずれか一つに記載のレーザ加工方法。 - 前記電力のパルスの繰り返し周波数は5kHz以上である
請求項1~7のいずれか一つに記載のレーザ加工方法。 - 前記電力のパルスの繰り返し周波数は50kHz以上300kHz未満である
請求項8に記載のレーザ加工方法。 - 前記加工対象の表面における前記レーザ光の照射位置を前記加工対象に対して相対的に移動させるステップをさらに含む
請求項1~9のいずれか一つに記載のレーザ加工方法。 - 少なくとも1枚の金属箔からなる加工対象をレーザ加工する装置であって、
半導体レーザを含む励起光源と、増幅用光ファイバとを備え、前記励起光源から前記増幅用光ファイバにパルス状の励起光を供給し、光励起によりレーザ光を発生させる光ファイバレーザであるレーザ装置と、
前記加工対象の表面に前記レーザ光を照射する光学ヘッドと、
前記レーザ装置を制御する制御装置と、
を備え、
前記制御装置は、前記レーザ光が、前記レーザ光の発生の初期に、前記光ファイバレーザにおける緩和振動発振に起因して発生するパルス光成分と、前記パルス光成分よりも時間的に後に続く連続光成分とを含み、前記パルス光成分のエネルギーに対する前記連続光成分のエネルギーの比が所定値以下になるように、前記連続光成分の持続時間を制限する制御を行う
レーザ加工装置。
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