JP4064905B2 - 相変化光記録媒体 - Google Patents
相変化光記録媒体 Download PDFInfo
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- JP4064905B2 JP4064905B2 JP2003369336A JP2003369336A JP4064905B2 JP 4064905 B2 JP4064905 B2 JP 4064905B2 JP 2003369336 A JP2003369336 A JP 2003369336A JP 2003369336 A JP2003369336 A JP 2003369336A JP 4064905 B2 JP4064905 B2 JP 4064905B2
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- phase change
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- Optical Record Carriers And Manufacture Thereof (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
Description
相変化光記録媒体は、光ビームの照射により結晶質と非晶質との間で可逆的な相変化を起こす相変化光記録膜を用い、以下のような原理で動作する。記録は、光ビームを照射した領域を融点以上に加熱して溶融した後、急激に冷却してその領域の原子配列を非晶質にすることにより行う。消去は、光ビームを照射した領域を融点以下・結晶化温度以上の温度領域に一定時間以上保持することにより行う。このとき、初期状態が結晶質の場合には結晶質のままであり、初期状態が非晶質の場合には結晶化する。読み出し(再生)は、非晶質領域からの反射光強度と、結晶質領域からの反射光強度が異なることを利用して、反射光の強弱を電気信号の強弱に変換し、さらにA/D変換することによって行う。
ここで、一枚の記録媒体に記録できる情報の量すなわち記録容量を増すためには、以下の二通りの方法が考えられる。
もうひとつの大容量化の手法は、それぞれ相変化光記録膜を含む複数の情報層を重ね合わせる方法である(たとえば特許文献1参照)。2つの情報層を重ね合わせ、片面から読み書きできるように設計された媒体を片面二層媒体または単に二層媒体と呼ぶ。また、片面二層媒体を更に重ね合わせて両面四層媒体とし更に大容量化することも可能である。片面二層媒体において、光入射面に近い情報層(以下、L0と称する)は、おおよそ50%以上の透過率を確保する必要がある。これは、光入射面から遠い情報層(以下、L1と称する)にアクセスする際に、L0情報層で必要以上に光を減衰させないことが重要になるためである。このためには、L0情報層では相変化光記録膜の厚さを10nm以下と極めて薄くする必要がある。このように相変化光記録膜が薄いと、結晶化に必要な保持時間が長くなり、通常の記録速度では消え残り(消去率の低下)が発生する。
高速記録は相変化光記録に対するもうひとつの要求である。例えば、映像を録画する場合、実際の視聴時間よりも短時間で記録ができるようになれば、配布媒体のダビング時や、放送録画中に時間を戻って前の映像を視聴するいわゆるタイムシフト機能の実現が容易となる。ここで相変化記録において高速記録をさまたげる一つの要因は、オーバーライト時に比較的低い消去レベルのレーザーによって結晶化を行う際、情報が消え残ってしまう問題、すなわち消去率不足の問題である。これは、記録マークがレーザースポット内を高速に通過するため、結晶化可能な温度領域に十分に長い時間保たれず、情報が消え残ってしまうためである。
結晶化促進機能を有する界面膜になり得る材料として、硫黄(S)フリーの保護膜用材料であるTa2O5+SiCを主成分とする材料が知られている(特許文献4)。この特許文献4は、主に現行のレーザーダイオード(LD)の波長λ=650nmを用いたDVDを改良することを目的に検討されている。しかし、特許文献4に開示されている材料は、次世代の青色LDの波長λ=405nmでは不透明となり、光学的ロスが大きくなる。そのため、次世代の高密度媒体では問題点がある。このように、現在開示されている範囲では、光学的に透明で結晶化促進機能を有する界面膜材料は知られていない。
相変化光記録媒体は、上述したようにレーザーのパルスの照射により記録膜の所望の部分にアモルファスのマークすなわちデータを書き込み、逆にアモルファスのマーク上にレーザーを照射し結晶化させてデータを消去する。前者ではレーザーが照射された部分を急冷することによりアモルファスのマークが形成され、後者ではレーザーが照射された部分を徐冷することによりアモルファスの部分を結晶化させる。また、記録膜での吸収率が大きければ、小さなレーザーパワーで記録・消去などの動作が行え、逆に記録膜での吸収率が小さければ記録・消去に大きなレーザーパワーを必要とする。記録膜での吸収率は、多層膜から形成される媒体の光学特性によって決まる。また、吸収率が同等でも膜構成によっては急冷構造であるかどうかなど、熱設計も重要である。すなわち、相変化光記録媒体の膜設計では、主に光学設計と熱設計とが考慮される。光学設計のためには、各薄膜の光学特性が、熱設計を行うためには各薄膜の融点、溶融潜熱、結晶化温度などを含む熱物性が必要となる。ところが、ナノメーターオーダーの薄膜の熱物性は、バルクと異なることがいくつかの研究によって分かっている。しかし、他の要因の効果を除去しつつ、それらを系統的に測定することができていなかった。そのため、これらを補正するための経験的なパラメーターが必要な状況であった。
(ここで、0.1≦x≦0.4、1.8≦y≦4、0<z≦0.5)
で表されることを特徴とする。
図1は、本発明の一実施形態に係る相変化光記録媒体を示す断面図である。図1に示す相変化光記録媒体は、透明基板1上に、第1干渉膜11、下部界面膜12、記録膜13、上部界面膜14、第2干渉膜15、反射膜16を順次積層した構造を有する。光は透明基板1を通して記録膜13に照射される。
以下、本発明の実施例を説明する。以下の実施例においては、片面二層媒体を作製した。
基板として、射出成形によって作製した厚さ0.59mmのポリカーボネート(PC)基板を使用した。基板には、グルーブピッチ0.68μmでグルーブを形成しているので、ランド・グルーブ記録ではトラックピッチは0.34μmとなる。
SbER測定はデータの誤り率を評価するものである。まず、所定のトラックに、2Tから9Tまでのパターンがランダムに含まれたマーク列を10回オーバーライトした。次に、前記トラックの両側の隣接トラックに同じランダムパターンを10回オーバーライトした。その後、最初のトラックに戻り、SbERを測定した。
アナログ測定は読み出し信号品質を評価するものである。まず、2Tから9Tまでのパターンがランダムに含まれたマーク列を10回オーバーライトした。次に、そのマーク列に9Tのシングルパターンを1回オーバーライトし、9Tマークの信号周波数の信号対ノイズ比(以下、CNRという)をスペクトラムアナライザーによって測定した。次に、消去パワーレベルのレーザービームをディスク一回転分照射し、記録マークを消去した。その際の、9Tマークの信号強度の減少分を測定した。これを消去率(ER)と定義する。次に、十分離れたトラックにヘッドを移動し、クロスイレース(E−X)の測定を行った。
同一トラックにランダム信号を2000回オーバーライト(OW)した後、上記と同様にしてSbERを測定した。
作製したディスクを85℃、85Rh%の環境下に300時間にわたって曝露した後、上記と同様にしてSbERを測定した。
実施例1と同様な構成で、種々の界面膜を用いてディスクを作製した。用いた界面膜はそれぞれHfSi0.4O4C0.5、HfSi0.1O2.5C0.1、HfSi0.2O3.5C0.01、HfSi0.15O2.8C0.001、HfSi0.18O3.1C0.0001、HfSi0.18O3C0.1、HfSi0.17O3.2C0.01、HfSi1.6O2.9C0.0001であった。作製したディスクについて実施例1と同様な試験を行った結果を表2に示す。表2からわかるように、いずれの実施例も良好な特性を示している。
実施例1と同様な構成で、さらに界面膜の材料を変化させてディスクを作製した。用いた界面膜材料はそれぞれHfSiOCN、HfSiON、ZrSiOC、ZrSiOCN、TiSiOC、TiSiON、NbSiOC、NbSiOCN、AlSiOC、AlSiOCN、ZnSiOC、ZnSiOCN、YSiOC、YSiON、LaSiOC、LaSiOCN、CeSiOC、CeSiON、PrSiOC、PrSiON、SmSiOC、SmSiOCN、EuSiOC、EuSiON、GdSiOC、GdSiOCN、TbSiOC、TbSiOCN、DySiOC、DySiON、HoSiOC、HoSiOCN、ErSiOC、ErSiON、TmSiOC、TmSiOCN、YbSiOC、YbSiOCN、LuSiOC、LuSiOCNであった。なお、いずれの界面膜も減衰係数が低くなるように組成を最適化している。作製したディスクについて実施例1と同様な試験を行った結果を表3〜表6に示す。これらの表からわかるように、いずれの実施例でも、CNR、各SbERともに良好な特性を示している。
界面膜を用いないディスク(比較例2)を作製した。また、実施例1と同様な構成で、界面膜として従来の材料を用いてディスクを作製した(比較例1、3〜5)。用いた界面膜材料は、それぞれSiC、Ta2O5+SiC、GeN、GeCrNであった。作製したディスクについて実施例1と同様な試験を行った結果を表6に示す。表6からわかるように、いずれの比較例でも、CNR、各SbERともに十分な特性が得られなかった。
Claims (5)
- 第1干渉膜と、光照射により結晶質と非晶質との間で可逆的な相変化を起こす相変化光記録膜と、第2干渉膜と、反射膜と、前記相変化光記録膜の少なくとも一方の面に接して形成された界面膜とを有し、前記界面膜は、一般式HfSi x O y C z
(ここで、0.1≦x≦0.4、1.8≦y≦4、0<z≦0.5)
で表されることを特徴とする相変化光記録媒体。 - 前記界面膜は、一般式HfSixOyCz
(ここで、0.1≦x≦0.2、2.5≦y≦3.5、0<z≦0.1)
で表されることを特徴とする請求項1に記載の相変化光記録媒体。 - 前記界面膜は、減衰係数が1×10-4以下であることを特徴とする請求項1または2に記載の相変化光記録媒体。
- 前記相変化光記録膜は、一般式
GexSbyTez
(ここで、x+y+z=100)
で表したとき、GeSbTe三元相図上で、x=55,z=45と、x=45,z=55と、x=10,y=28,z=42と、x=10,y=36,z=54とで囲まれる範囲の組成を有することを特徴とする請求項1ないし3のいずれか1項に記載の相変化光記録媒体。 - 前記相変化光記録膜は、構成元素の一部がBiおよび/またはSnで置換されており、一般式
(Ge (1-w) Sn w ) x (Sb (1-v) Bi v ) y Te z
(ここで、x+y+z=100、0≦w<0.5、0≦v<0.7)
で表される組成を有することを特徴とする請求項4に記載の相変化光記録媒体。
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-
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- 2003-10-29 JP JP2003369336A patent/JP4064905B2/ja not_active Expired - Fee Related
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2004
- 2004-10-26 US US10/972,768 patent/US7214416B2/en not_active Expired - Fee Related
-
2006
- 2006-08-14 US US11/503,248 patent/US20060275577A1/en not_active Abandoned
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US7767285B2 (en) | 2010-08-03 |
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US20050112499A1 (en) | 2005-05-26 |
US20060275577A1 (en) | 2006-12-07 |
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