JP4214115B2 - 光学的情報記録媒体及びその製造方法 - Google Patents
光学的情報記録媒体及びその製造方法 Download PDFInfo
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- JP4214115B2 JP4214115B2 JP2004542854A JP2004542854A JP4214115B2 JP 4214115 B2 JP4214115 B2 JP 4214115B2 JP 2004542854 A JP2004542854 A JP 2004542854A JP 2004542854 A JP2004542854 A JP 2004542854A JP 4214115 B2 JP4214115 B2 JP 4214115B2
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Description
(b)第2の情報層105上に光学分離層104を形成する工程
(c)光学分離層104上に第1の情報層103を形成する工程
(d)第1の情報層103上に第1の基板102を接着する工程
すなわち、従来の光学的情報記録媒体101では、(c)の光学分離層104上に第1の情報層103を形成する際、光学分離層104の上にまず高屈折率誘電体材料を用いて透過率調整層1035を成膜する。
(a)前記第2の情報層を形成する工程と、
(b)前記第2の情報層上に前記光学分離層を形成する工程と、
(c)前記光学分離層上に前記第1の情報層を形成する工程と、
を含み、前記(c)の工程は、前記光学分離層上に低屈折率層を形成する工程と、前記低屈折率層上に透過率調整層を形成する工程と、記録層を形成する工程と、を順に含み、情報の記録または再生の際に用いられるレーザビームに対し、前記(c)の工程にて形成される前記低屈折率層の屈折率をn1、前記光学分離層の屈折率をn4とすると、n1及びn4が、|n1−n4|≦0.5の関係を満たすように前記低屈折率層及び前記光学分離層が形成され、前記レーザビームに対し、前記(c)の工程にて形成される前記透過率調整層の屈折率をn2、消衰係数をk2とすると、n2及びk2が、2.0≦n2、且つk2≦0.1を満たすように前記透過率調整層が形成されることを特徴としている。
|n1−n4|≦0.5
の関係を満たすことが好ましく、
|n1−n4|≦0.1
の関係を満たすことがより好ましい。良好な反射率特性が得られるからである。
40<Tc1 且つ 40<Ta1
の関係を満たすことが好ましい。レーザビーム入射側から見て第1の情報層よりも奥側に配置された情報層に、十分な光量のレーザビームを到達させることができるからである。
1.0≦(n2−n3)≦3.0
及び
1.0≦(k3−k2)≦4.0
のうち少なくとも何れか一方の関係が成立することが好ましい。反射層に対して屈折率が大きく、且つ消衰係数が小さい透過率調整層に光が閉じ込められて、光の干渉効果が大きくなるため、第1の情報層の透過率を高めることができるからである。
|n1−n4|≦0.5
の関係を満たすように、前記低屈折率層及び光学分離層が形成されることが好ましい。良好な反射率特性を有する光学的情報記録媒体が作製できるからである。
本発明の光学的情報記録媒体の一実施形態について説明する。なお、本発明の光学的情報記録媒体は光学分離層によって互いに分離された複数の情報層を含む記録媒体であるが、本実施の形態では、一例として、二つの情報層を含む光学的情報記録媒体について説明する。
本発明の光学的情報記録媒体の製造方法の一実施形態について説明する。本実施の形態においては、実施の形態1で説明した光ディスク1(図2参照。)を製造する方法について説明する。
記録層142は、その組成に応じて、Te、InまたはSe等を主成分とする材料からなるスパッタリングターゲットを、一つの電源を用いて、スパッタリングすることによって形成できる。
実施の形態3では、実施の形態1で説明した光ディスク1に対して情報の記録再生を行う方法について説明する。
Claims (9)
- 基板と、前記基板上に設けられた複数の情報層と、互いに隣接する情報層間に設けられた光学分離層と、を含み、レーザビームの照射により情報の記録または再生が行なわれる光学的情報記録媒体であって、
前記複数の情報層のうち最もレーザビーム入射側に配置された情報層を第1の情報層とし、前記第1の情報層に接して配置された光学分離層を第1の光学分離層とすると、前記第1の情報層は、レーザビーム入射側から順に、光学的に互いに異なる二つの状態間を変化しうる記録層と、前記第1の情報層の透過率を調整する透過率調整層と、前記透過率調整層と前記第1の光学分離層との間に配置された低屈折率層とを含み、
前記レーザビームに対する前記低屈折率層の屈折率をn1、前記第1の光学分離層の屈折率をn4とすると、n1及びn4が、
|n1−n4|≦0.5
の関係を満たし、
前記レーザビームに対する前記透過率調整層の屈折率をn2、消衰係数をk2とすると、n2及びk2が、2.0≦n2、且つk2≦0.1を満たすことを特徴とする光学的情報記録媒体。 - 前記n1及びn4が、
|n1−n4|≦0.1
の関係を満たす請求項1に記載の光学的情報記録媒体。 - 前記第1の情報層に含まれる前記記録層が、結晶状態と非晶質状態との間を変化しうる材料にて形成されており、
前記記録層が結晶状態であるときの前記レーザビームに対する前記第1の情報層の透過率をTc1(%)、前記記録層が非晶質状態であるときの前記レーザビームに対する前記第1の情報層の透過率をTa1(%)とすると、Tc1及びTa1が、
40<Tc1 且つ 40<Ta1
の関係を満たす請求項1に記載の光学的情報記録媒体。 - 前記第1の情報層が、前記記録層と前記透過率調整層との間に配置された反射層をさらに含み、
前記レーザビームに対する前記反射層の屈折率をn3、消衰係数をk3とすると、
前記レーザビームに対する前記透過率調整層の屈折率n2、消衰係数k2と、前記レーザビームに対する前記反射層の屈折率n3、消衰係数k3とにおいて、
1.0≦(n2−n3)≦3.0
及び
1.0≦(k3−k2)≦4.0
のうち少なくとも何れか一方の関係が成立する請求項1に記載の光学的情報記録媒体。 - 前記低屈折率層は、SiO 2 、Al 2 O 3 、LaF 3 、ZrSiO 4 及びZrO 2 から選ばれる少なくとも一つを含む請求項1に記載の光学的情報記録媒体。
- 前記低屈折率層の膜厚が1nm以上25nm以下である請求項1に記載の光学的情報記録媒体。
- 光学分離層を介して互いに積層された第1の情報層及び第2の情報層を少なくとも含み、最もレーザビーム入射側に配置された情報層を前記第1の情報層とする、光学的情報記録媒体の製造方法であって、
(a)前記第2の情報層を形成する工程と、
(b)前記第2の情報層上に前記光学分離層を形成する工程と、
(c)前記光学分離層上に前記第1の情報層を形成する工程と、
を含み、
前記(c)の工程は、前記光学分離層上に低屈折率層を形成する工程と、前記低屈折率層上に透過率調整層を形成する工程と、記録層を形成する工程と、を順に含み、
情報の記録または再生の際に用いられるレーザビームに対し、前記(c)の工程にて形成される前記低屈折率層の屈折率をn1、前記光学分離層の屈折率をn4とすると、n1 及びn4が、
|n1−n4|≦0.5
の関係を満たすように前記低屈折率層及び前記光学分離層が形成され、
前記レーザビームに対し、前記(c)の工程にて形成される前記透過率調整層の屈折率をn2、消衰係数をk2とすると、n2及びk2が、2.0≦n2、且つk2≦0.1を満たすように前記透過率調整層が形成されることを特徴とする光学的情報記録媒体の製造方法。 - 前記(c)の工程において、前記低屈折率層は、SiO 2 、Al 2 O 3 、LaF 3 、ZrSiO 4 及びZrO 2 から選ばれる少なくとも一つを含む材料にて形成される請求項7に記載の光学的情報記録媒体の製造方法。
- 前記(c)の工程において、前記低屈折率層は、1nm以上25nm以下の膜厚に形成される請求項7に記載の光学的情報記録媒体の製造方法。
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