JP4618326B2 - 光情報媒体、及びその記録または再生方法 - Google Patents
光情報媒体、及びその記録または再生方法 Download PDFInfo
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- JP4618326B2 JP4618326B2 JP2008117920A JP2008117920A JP4618326B2 JP 4618326 B2 JP4618326 B2 JP 4618326B2 JP 2008117920 A JP2008117920 A JP 2008117920A JP 2008117920 A JP2008117920 A JP 2008117920A JP 4618326 B2 JP4618326 B2 JP 4618326B2
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Description
λ/(t・NA3 )
に比例する。また、光記録媒体がレーザービームに対して傾くと、すなわちチルトが発生すると、波面収差(コマ収差)が発生する。基体の屈折率をn、傾き角をθとすると、波面収差係数は
(1/2)・t・{n2 ・ sinθ・ cosθ}・NA3 /(n2 −sin2θ)-5/2
で表される。これら各式から、チルトマージンを大きくし、かつコマ収差の発生を抑えるためには、基体の厚さtを小さくすればよいことがわかる。実際、DVDでは、基体の厚さをCD基体の厚さ(1.2mm程度)の約半分(0.6mm程度)とすることにより、チルトマージンを確保している。
(1) 支持基体上に情報記録層を有し、この情報記録層上に光透過層を有し、この光透過層を通して記録または再生のためのレーザー光が入射するように使用される光情報媒体であって、
前記光透過層は、活性エネルギー線硬化型組成物が硬化された樹脂から構成され、30〜200μmの厚さを有し、
前記光透過層は、記録波長および再生波長における表面反射率が10%以下であり、
前記光透過層は、引張破壊強さが17〜32MPa かつ引張破壊伸びが18〜68%かつ引張弾性率が76〜784MPa である光情報媒体。
(2) 前記光透過層は、前記情報記録層上の内部層と、前記内部層上の表面層とからなり、前記表面層は0.3〜5μmの厚さを有する、上記(1)の光情報媒体。
(3) 線速度8m/s 以上で使用される、上記(1)又は(2)の光情報媒体。
(4) 対物レンズの開口数をNA、記録光または再生光の波長をλとしたとき、
λ/NA≦780nm
である装置により記録または再生が行われる、上記(1)〜(3)のいずれかの光情報媒体。
(5) 前記光透過層は、活性エネルギー線硬化型組成物をスピンコート法により塗布し、その後、活性エネルギー線照射して硬化することによって形成されたものである、上記(1)〜(4)のいずれかの光情報媒体。
(6) 上記(1)〜(5)のいずれかの光情報媒体に対し、前記光透過層を通して記録または再生のためのレーザー光を入射させて記録または再生を行う光情報媒体の記録または再生方法。
試験片の長さ:60mm、
試験片の幅:10mm、
標線間距離:40±1mm、
掴み具間距離:44±1mm、
引張速度:30mm/min
とし、そのほかの測定条件はJIS K7127-1989の規定に従えばよい。これらの条件をJIS K7127-1989と異なるものとするのは、媒体から剥離した光透過層で測定できるように、媒体(光ディスク)の寸法(通常、直径12cm程度)を考慮したためである。
λ/NA≦780nm、特に
λ/NA≦680nm
である装置により記録または再生が行われる場合に、特に有効である。すなわち、比較的短波長の記録・再生光を、高NAの対物レンズを用いて照射する場合に特に有効である。なお、
400nm≦λ/NA
の範囲において良好な記録・再生特性を実現できれば、一般的には十分である。
Wt≦1840e-0.04V
が成立することが好ましいことを見いだした。使用線速度Vに応じて最大うねりWtが上記範囲内に収まるように光透過層を形成することにより、フォーカスサーボエラーの少ない媒体が実現できる。なお、Wtは小さいほど好ましいが、Wtを著しく小さくしても、それによって効果が著しく向上するわけではないので、通常、Wtは
Wt≧10nm
とすればよい。なお、本発明で限定する最大うねりWtは、ANSI B46.1に規定されている。光透過層のWtを測定するに際しては、
ハイパスフィルタ:0.2mm、
ローパスフィルタ:2mm、
評価長さ:20mm、
基準長さ:16mm、
プローブ押しつけ力:10mg、
プローブ:曲率半径12.5μmのダイヤモンド針、
測定時間:25秒間
とし、そのほかの測定条件は上記ANSI B46.1の規定に従えばよい。
D=2 tan{ sin -1 (NA/n)}・t+1.22λ/NA
で表される。なお、ビームスポットが長円形である場合、上記ビームスポット径は記録トラック長さ方向における径である。
以下の手順で、光記録ディスクサンプルを作製した。
レーザー波長:405nm、
開口数NA:0.85、
線速度:11.4m/s 、
記録信号:1−7変調信号(最短信号長2T)
の条件で、ランドおよびグルーブに記録を行った。次いで、記録信号を再生し、ジッタを測定した。結果を表1に示す。なお、このジッタは、再生信号をタイムインターバルアナライザにより測定し、検出窓幅をTwとして
σ/Tw (%)
により求めたクロックジッタである。このジッタが13%以下であれば、エラーが許容範囲に収まるが、各種マージンを十分に確保するためには、このジッタが好ましくは10%以下、より好ましくは9%以下であることが望ましい。
紫外線硬化型樹脂(日本化薬社製のB8、25℃における粘度5,000cP)をスピンコートにより塗布し、紫外線を照射することにより厚さ100μmの光透過層としたほかは実施例1と同様にして、光記録ディスクサンプルを作製した。このサンプルについて、実施例1と同様な測定を行った。結果を表1に示す。
紫外線硬化型樹脂(昭和高分子社製のSSP50U14、25℃における粘度4,000cP)をスピンコートにより塗布し、紫外線を照射することにより厚さ100μmの光透過層としたほかは実施例1と同様にして、光記録ディスクサンプルを作製した。このサンプルについて、実施例1と同様な測定を行った。結果を表1に示す。
紫外線硬化型樹脂(昭和高分子社製のNo. 303−2、25℃における粘度4,000cP)をスピンコートにより塗布し、紫外線を照射することにより厚さ100μmの光透過層としたほかは実施例1と同様にして、光記録ディスクサンプルを作製した。このサンプルについて、実施例1と同様な測定を行った。結果を表1に示す。
紫外線硬化型樹脂(長瀬チバ社製のT695/UR740、25℃における粘度2,100cP)をスピンコートにより塗布し、紫外線を照射することにより厚さ100μmの光透過層としたほかは実施例1と同様にして、光記録ディスクサンプルを作製した。このサンプルについて、実施例1と同様な測定を行った。結果を表1に示す。
紫外線硬化型樹脂(大日本インキ化学工業社製のSD318、25℃における粘度140cP)をスピンコートにより塗布し、紫外線を照射することにより厚さ100μmの光透過層としたほかは実施例1と同様にして、光記録ディスクサンプルを作製した。このサンプルについて、実施例1と同様な測定を行った。結果を表1に示す。
前記特開平8−194968号公報の実施例3に記載された紫外線硬化型樹脂を用意した。この紫外線硬化型樹脂は、
EPA−1(日本化薬(株)製) 20重量部、
MANDA(日本化薬(株)製) 40重量部、
THF−A(共栄油脂(株)製) 10重量部、
R−561(日本化薬(株)製) 30重量部、
Darocur BP(チバ・スペシャルティ・ケミカルズ(株)製) 3重量部、
DMBI(日本化薬(株)製) 1重量部、
Irgacure 651(チバ・スペシャルティ・ケミカルズ(株)製) 3重量部
を含有するものであり、25℃における粘度は64cPである。光透過層の形成にこの紫外線硬化型樹脂を用いたほかは実施例1と同様にして、光記録ディスクサンプルを作製した。紫外線照射エネルギー密度は2000mW/cm2とした。ただし、この紫外線硬化型樹脂は粘度が低いため、厚さ50μmを超える光透過層は形成できなかったため、光透過層の厚さは50μmとした。このサンプルについて、実施例1と同様な測定を行った。結果を表1に示す。
サンプルNo. 1
光透過層を以下の手順で形成したほかは実施例1と同様にして、光記録ディスクサンプルを作製した。
紫外線源としてウシオ電機社製の高圧水銀灯(3kWタイプ、照射エネルギー密度300mJ/cm2)を用い、紫外線照射エネルギー密度を600mW/cm2としたほかはサンプルNo. 1と同様にして、光記録ディスクサンプルを作製した。
接着層の形成に用いる紫外線硬化型樹脂をナガセケムテックス社製のT695/UR621とし、紫外線源としてウシオ電機社製のマルチライト(250W タイプ)を用い、紫外線照射エネルギー密度を50mW/cm2としたほかはサンプルNo. 1と同様にして、光記録ディスクサンプルを作製した。
第1誘電体層表面に、紫外線硬化型樹脂(日本化薬社製のB8、25℃における粘度5,000cP)をスピンコートにより塗布し、紫外線を照射することにより厚さ100μmの光透過層としたほかはサンプルNo. 1と同様にして、光記録ディスクサンプルを作製した。なお、紫外線照射条件は、サンプルNo. 2の接着層硬化条件と同じとした。
TDK株式会社製のDVD−RAM(片面2.6GBタイプ)であり、記録再生用レーザー光が、厚さ0.6mmのポリカーボネート基体を通して入射する構造である。
TDK株式会社製のDVD−RAM(両面5.2GBタイプ)であり、記録再生用レーザー光が、厚さ0.6mmのポリカーボネート基体を通して入射する構造である。
上記各サンプルのレーザー光入射面について、ANSI B46.1に規定された粗さパラメータ(中心線平均粗さRa、最大粗さRt、中心線うねりWaおよび最大うねりWt)を測定した。これらの粗さパラメータは、レーザー光入射面の半径40mmの位置において測定した。測定方向は、サンプルの周方向に対する接線方向であり、測定長さは20mmとした。この測定を5回繰り返して平均値を求めた。なお、最大うねりWt測定の際の条件は、本発明で限定する前記測定条件とした。結果を表2に示す。
レーザー波長:405nm、
開口数NA:0.85
とし、サンプルNo. 5〜6については測定条件をDVD−RAMと同じに、すなわち
レーザー波長:635nm、
開口数NA:0.60
とした。
Wt=1840e-0.04V
で表される曲線を併記してある。
Wt=1840e-0.04V
で表される曲線より上側に存在する。したがって、
Wt≦1840e-0.04V
を満足する線速度Vで使用した場合、いずれのサンプルにおいても前記R/Fは10%以下となる。
Wt≦1840e-0.04V
よって限定される線速度Vよりも大幅に速い線速度で使用することが可能である。その理由は、サンプルNo. 5〜6におけるR/Fの測定条件をDVD−RAMの再生条件と同じとしたからである。すなわち、サンプルNo. 1〜4では、光入射面におけるビームスポット径が約120μmであるため、Wtの制御が有効であるが、サンプルNo. 5〜6では光入射面におけるビームスポット径が約490μmと極めて大きいため、Wtを制御する必要がない。
20 支持基体
21 グルーブ
4 記録層
Claims (6)
- 支持基体上に情報記録層を有し、この情報記録層上に光透過層を有し、この光透過層を通して記録または再生のためのレーザー光が入射するように使用される光情報媒体であって、
前記光透過層は、活性エネルギー線硬化型組成物が硬化された樹脂から構成され、30〜200μmの厚さを有し、
前記光透過層は、記録波長および再生波長における表面反射率が10%以下であり、
前記光透過層は、引張破壊強さが17〜32MPa かつ引張破壊伸びが18〜68%かつ引張弾性率が76〜784MPa である光情報媒体。 - 前記光透過層は、前記情報記録層上の内部層と、前記内部層上の表面層とからなり、前記表面層は0.3〜5μmの厚さを有する、請求項1の光情報媒体。
- 線速度8m/s 以上で使用される、請求項1又は2の光情報媒体。
- 対物レンズの開口数をNA、記録光または再生光の波長をλとしたとき、
λ/NA≦780nm
である装置により記録または再生が行われる、請求項1〜3のいずれかの光情報媒体。 - 前記光透過層は、活性エネルギー線硬化型組成物をスピンコート法により塗布し、その後、活性エネルギー線照射して硬化することによって形成されたものである、請求項1〜4のいずれかの光情報媒体。
- 請求項1〜5のいずれかの光情報媒体に対し、前記光透過層を通して記録または再生のためのレーザー光を入射させて記録または再生を行う光情報媒体の記録または再生方法。
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- 2001-05-31 JP JP2001165084A patent/JP2002230834A/ja active Pending
- 2001-06-22 DE DE60139048T patent/DE60139048D1/de not_active Expired - Lifetime
- 2001-06-22 EP EP01305441A patent/EP1168320B1/en not_active Expired - Lifetime
- 2001-06-25 US US09/887,434 patent/US6667952B2/en not_active Expired - Lifetime
- 2001-06-26 CN CNB011243317A patent/CN1185644C/zh not_active Expired - Fee Related
- 2001-06-26 TW TW090115420A patent/TW594715B/zh not_active IP Right Cessation
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Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2000011454A (ja) * | 1998-06-29 | 2000-01-14 | Sony Corp | 光記録媒体と、これを用いた光記録再生装置と、光記録媒体の製造方法 |
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JP2010153036A (ja) | 2010-07-08 |
US6667952B2 (en) | 2003-12-23 |
DE60139048D1 (de) | 2009-08-06 |
US20040047278A1 (en) | 2004-03-11 |
TW594715B (en) | 2004-06-21 |
US20020015378A1 (en) | 2002-02-07 |
JP2002230834A (ja) | 2002-08-16 |
EP1168320A3 (en) | 2002-05-22 |
JP2008217983A (ja) | 2008-09-18 |
EP1168320B1 (en) | 2009-06-24 |
CN1185644C (zh) | 2005-01-19 |
EP1168320A2 (en) | 2002-01-02 |
CN1338737A (zh) | 2002-03-06 |
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