JP2017218626A - 多層膜の成膜方法 - Google Patents
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- C23C14/54—Controlling or regulating the coating process
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/56—Apparatus specially adapted for continuous coating; Arrangements for maintaining the vacuum, e.g. vacuum locks
- C23C14/562—Apparatus specially adapted for continuous coating; Arrangements for maintaining the vacuum, e.g. vacuum locks for coating elongated substrates
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- G01—MEASURING; TESTING
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- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
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- G02—OPTICS
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Abstract
Description
本発明の多層膜の成膜方法に含まれるプロセスにおいては、上記の各ステップを繰り返して、実測光学値と各ステップの理論光学値の差が収束条件を満たす各層の推定膜厚値を求める。
本発明の多層膜の成膜方法においては、収束条件を満たす各層の推定膜厚値を、成膜された各層の最も確かな推定膜厚値(最確推定膜厚値)とする。
(2)本発明の多層膜の成膜方法においては、多層膜の光学特性が、多層膜の分光反射率である。
(3)本発明の多層膜の成膜方法においては、多層膜の光学特性が、多層膜の反射光の色相である。
(4)本発明の多層膜の成膜方法は、各層の膜厚を推定する際、分光反射率または反射光の色相を参照して各層の最適な膜厚を算出し、それに基づき各層の中で膜厚を変更すべき層を決定するステップを含む。
(5)本発明の多層膜の成膜方法においては、カーブフィッティング法を用いて、あるステップの光学値差より更に小さい光学値差が得られる推定膜厚値を求める。
(6)本発明の多層膜の成膜方法においては、多層膜が多層光学膜である。
(7)本発明の多層膜の成膜方法においては、多層膜がスパッタ法により成膜される。
図1に本発明に係る多層膜の一例を模式的に示す。多層膜6の層数は限定されないが、図1は5層の場合を示す。図1(a)は多層膜6を積層するための基材7である。基材7の材質として、例えば、ガラス板、ガラスフィルム、プラスチック板、プラスチックフィルム、金属コイル、金属板などが挙げられる。基材7の材質、厚さ、形状(平面、曲面、枚葉あるいは長尺フィルムなど)などは限定されない。
多層膜の各層の膜厚は、多層膜の断面を電子顕微鏡で観察すれば、精度良く知ることができる。しかし、特に長尺フィルムに多層膜を成膜する場合、長尺フィルムから頻繁にサンプルを切り出して断面を観察することは現実的でない。従って、非破壊的な方法により多層膜の各層の膜厚を推定しなければならない。本発明では非破壊的な方法として、成膜された多層膜に光を照射し、その反射光あるいは透過光の光学値を用いて各層の膜厚を推定する。本発明において、各層の膜厚の推定に用いる光学値は、例えば、分光反射率、反射光の色相、分光透過率、あるいは、透過光の色相である。
本発明の膜厚推定方法を次に説明する。本発明の膜厚推定方法では、まず各層の推定膜厚値を仮定し、理論計算によりそれに対する理論光学値を求める。1回目の理論計算のときは、各層の推定膜厚値を目標膜厚値(設計膜厚値)とする。次に理論光学値と実測光学値を比較する。理論光学値と実測光学値を比較するステップを、光学値差(実測光学値と理論光学値の差)が予め設定した収束条件(例えば、分光反射率の実測値と理論値の差の規格値)を満たすようになるまで、各層の推定膜厚値を変化させてn回(n=1,2,3,4,…)繰り返す。光学値差が予め設定した収束条件を満たすようになったときの各層の推定膜厚値を、各層の最も確かな推定膜厚値(「最確推定膜厚値」)とする。以下の説明では、一例として、理論光学値と実測光学値を比較するステップを3回(n=3)繰り返したところで光学値差が収束条件を満たした場合を述べる。
2 第2層
3 第3層
4 第4層
5 第5層
6 多層膜
7 基材
Claims (7)
- 多層膜の各層の膜厚の目標値(目標膜厚値)を設定するステップと、
前記各層の膜厚が前記目標膜厚値のときの光学特性の理論値(第1理論光学値)を求めるステップと、
成膜された多層膜の光学特性の実測値(実測光学値)を測定するステップと、
前記目標膜厚値を、成膜された前記各層の膜厚の第1推定膜厚値とするステップと、
前記実測光学値と前記第1理論光学値の差(第1光学値差)を求め、前記第1光学値差を予め設定された収束条件と比較するステップと、
前記第1光学値差が前記収束条件を満たさない場合、前記第1光学値差より小さい光学値差が得られると予想される前記各層の膜厚の第2推定膜厚値を設定するステップと、
前記各層の膜厚が前記第2推定膜厚値のときの光学特性の理論値(第2理論光学値)を求めるステップと、
前記実測光学値と前記第2理論光学値の差(第2光学値差)を求め、前記第2光学値差を前記収束条件と比較するステップと、
上記各ステップを繰り返して、前記実測光学値と各ステップの理論光学値の差が前記収束条件を満たす前記各層の推定膜厚値を求めるプロセスを含み、
前記収束条件を満たす前記各層の推定膜厚値を、成膜された前記各層の最も確かな推定膜厚値(最確推定膜厚値)とする多層膜の成膜方法。 - 前記多層膜の光学特性が、前記多層膜の分光反射率である請求項1に記載の多層膜の成膜方法。
- 前記多層膜の光学特性が、前記多層膜の反射光の色相である請求項1に記載の多層膜の成膜方法。
- 前記各層の膜厚を推定する際、前記分光反射率または前記反射光の色相を参照して前記各層の最適な膜厚を算出し、それに基づき前記各層の中で膜厚を変更すべき層を決定するステップを含む請求項2または3に記載の多層膜の成膜方法。
- カーブフィッティング法を用いて、あるステップの光学値差より更に小さい光学値差が得られる推定膜厚値を求める請求項1〜4のいずれかに記載の多層膜の成膜方法。
- 前記多層膜が多層光学膜である請求項1〜5のいずれかに記載の多層膜の成膜方法。
- 前記多層膜がスパッタ法により成膜される請求項1〜6のいずれかに記載の多層膜の成膜方法。
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JP2016113538A JP6869648B2 (ja) | 2016-06-07 | 2016-06-07 | 多層膜の成膜方法 |
US16/306,711 US11066741B2 (en) | 2016-06-07 | 2017-06-02 | Film formation method for multilayer film |
KR1020187031124A KR102400204B1 (ko) | 2016-06-07 | 2017-06-02 | 다층막의 성막 방법 |
CN201780035580.XA CN109312455B (zh) | 2016-06-07 | 2017-06-02 | 多层膜的成膜方法 |
PCT/JP2017/020580 WO2017213040A1 (ja) | 2016-06-07 | 2017-06-02 | 多層膜の成膜方法 |
TW106118814A TWI781105B (zh) | 2016-06-07 | 2017-06-07 | 多層膜之成膜方法 |
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JPH11230719A (ja) * | 1998-02-17 | 1999-08-27 | Toray Ind Inc | 光記録媒体の検査方法および製造方法 |
JP2006071316A (ja) * | 2004-08-31 | 2006-03-16 | Technos Kk | 膜厚取得方法 |
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JP6869648B2 (ja) | 2021-05-12 |
CN109312455A (zh) | 2019-02-05 |
KR20190017729A (ko) | 2019-02-20 |
TW201802270A (zh) | 2018-01-16 |
US11066741B2 (en) | 2021-07-20 |
CN109312455B (zh) | 2022-01-25 |
US20190127844A1 (en) | 2019-05-02 |
KR102400204B1 (ko) | 2022-05-19 |
WO2017213040A1 (ja) | 2017-12-14 |
TWI781105B (zh) | 2022-10-21 |
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