JP2021064640A - ウエーハの加工方法 - Google Patents
ウエーハの加工方法 Download PDFInfo
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Abstract
Description
本発明の実施形態1に係るウエーハの加工方法を実施する加工装置1を図面に基づいて説明する。図1は、実施形態1に係るウエーハの加工方法を実施する加工装置1の構成例を示す斜視図である。加工装置1は、被加工物であるウエーハ200を切削し、切削加工によって形成された加工痕(加工溝)である切削溝400(図11,図12参照)に対していわゆるカーフチェックを遂行する切削装置であり、以下において、切削加工及び切削加工によって形成された切削溝400に対してカーフチェックを遂行する形態について説明する。なお、加工装置1は、本発明ではこれに限定されず、ウエーハ200にレーザーを照射してウエーハ200をレーザー加工し、レーザー加工によって形成された加工痕(加工溝)であるレーザー加工痕に対していわゆるカーフチェックを遂行するレーザー加工装置であってもよい。
本発明の実施形態1の変形例に係るウエーハの加工方法を図面に基づいて説明する。図13は、実施形態1の変形例に係るウエーハの加工方法のフローの一例を示すフローチャートである。図13は、実施形態1と同一部分に同一符号を付して説明を省略する。
本発明の実施形態2に係るウエーハの加工方法を図面に基づいて説明する。図14は、実施形態2に係るウエーハの加工方法を実施するレーザー加工装置501の要部の構成例を示す断面図である。図15は、実施形態2に係るウエーハの加工方法における加工ステップST16の一例を示す図である。図16は、実施形態2に係るウエーハの加工方法における加工溝評価ステップST17の一例を示す図である。図14、図15及び図16は、実施形態1と同一部分に同一符号を付して説明を省略する。
10 保持テーブル
20 加工ユニット
30,526 撮像手段
40 検査部
50 記録部
60 制御ユニット
200 ウエーハ
201 表面
202 分割予定ライン
207 交差部
208 金属パターン
210,212 評価領域
221,222,223 領域
260,310 基準パターン領域
261 四隅
262,312 パターン領域
263 パターン領域境界線
400 切削溝
501 レーザー加工装置
520 レーザー加工ユニット
600 レーザー
700 レーザー加工溝
800 発光
Claims (3)
- 表面に、分割予定ラインと、該分割予定ラインで区画されたデバイス領域と、を含む同一のパターン領域が周期的に複数形成されたウエーハの加工方法であって、
ウエーハの裏面側を保持テーブルに保持する保持ステップと、
保持テーブルと撮像手段とを相対的に移動させながらウエーハの表面を複数箇所撮像する撮像ステップと、
撮像された画像の中で実質的に同一な画像が出現する周期及び位置情報を検出し、一つの周期に対応する該パターン領域を検出するパターン領域検出ステップと、
該分割予定ライン上で金属パターンが形成されていない位置を検出し、加工溝の良否を評価する評価領域として設定する評価領域設定ステップと、
該パターン領域における該評価領域の位置を記録し、該評価領域を異なる該パターン領域の同様の箇所に展開する評価領域展開ステップと、
ウエーハを加工する加工ステップと、
少なくとも二つ以上の該パターン領域において該評価領域を撮像し加工溝を撮像し良否を判定する加工溝評価ステップと、
を備えることを特徴とする、ウエーハの加工方法。 - 表面に、分割予定ラインと、該分割予定ラインで区画されたデバイス領域と、を含む同一のパターン領域が周期的に複数形成されたウエーハの加工方法であって、
ウエーハの裏面側を保持テーブルに保持する保持ステップと、
保持テーブルと撮像手段とを相対的に移動させながらウエーハの表面を複数箇所撮像する撮像ステップと、
撮像された画像の中で実質的に同一な画像が出現する周期及び位置情報を検出し、一つの周期に対応する該パターン領域を検出するパターン領域検出ステップと、
該分割予定ライン上で金属パターンが形成されていない位置を検出し、加工溝の良否を評価する評価領域として設定する評価領域設定ステップと、
該パターン領域における該評価領域の位置を記録し、該評価領域を異なる該パターン領域の同様の箇所に展開する評価領域展開ステップと、
ウエーハにレーザーを照射して加工する加工ステップと、
該評価領域の加工中に該評価領域とレーザー照射によって発生する発光とを撮像して加工状況の良否を判定する加工溝評価ステップと、
を含むことを特徴とするウエーハの加工方法。 - 複数の分割予定ラインは、第1の方向と、第1の方向と交差する第2の方向とに形成されており、
該パターン領域検出ステップは、該第1の方向と該第2の方向との双方で行うことを特徴とする請求項1または請求項2に記載のウエーハの加工方法。
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