JP2009080895A - 情報記録媒体及びこの媒体を用いたディスク装置 - Google Patents
情報記録媒体及びこの媒体を用いたディスク装置 Download PDFInfo
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- JP2009080895A JP2009080895A JP2007249664A JP2007249664A JP2009080895A JP 2009080895 A JP2009080895 A JP 2009080895A JP 2007249664 A JP2007249664 A JP 2007249664A JP 2007249664 A JP2007249664 A JP 2007249664A JP 2009080895 A JP2009080895 A JP 2009080895A
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Abstract
【解決手段】 同心円またはスパイラル形状のグルーブ及びランドが形成された透明樹脂基板と、前記透明樹脂基板の前記グルーブ及び前記ランド上に形成された記録層とを少なくとも有し、450nm以下の半導体レーザーを用いて情報を記録再生することが可能な情報記録媒体において、前記情報記録媒体に記録された情報を再生することで、0.87≦M4x/M1x≦1.05を満たすことを特徴とする。
【選択図】 図1
Description
本発明は、多層で情報の記録を可能とした情報記録媒体及びこの媒体を用いたディスク装置に関する。
標準速で記録が可能なHD DVD−Rディスクに例えば4倍速での記録を試みると、記録信号特性が大きく劣化するという問題があり、現状の記録層の特性では、高線速記録を行うことは困難であった。
標準速に比べ、高線速で記録を行う場合、標準速と同じ変調度と記録特性を得るのに必要な半径方向の温度分布を保つのが難しい。マーク幅を広げようとすると、トラック中心の温度が上昇しすぎて基板などの物理変化を伴ってしまい、記録特性が悪化する。一方、トラック中心の温度を標準速と同じようにすると、高線速のほうが熱の広がりが狭くなるために、マーク幅が狭まり変調度が小さくなるが、基板などの物理変化が生じにくく、良好な記録特性を維持しやすい。
本発明者らが様々な色素で検討した結果を図1に示す。
図1は、1倍速と4倍速の変調度の比(M4x/M1x)と、1倍速と4倍速でのPRSNRとの関係を表すグラフ図を示す。図中、ひし形は1倍速、四角は4倍速を各々示し、全て実験結果を反映させてある。
本発明では、上述の条件を満足し、マーク歪みがほとんどない記録層が得られるように使用する有機色素材料を選択し得る。
本発明にかかる情報記録媒体に設けられる記録層の材料として、有機色素材料を用いることができる。また、有機色素材料として、有機金属錯体を用いることができる。このような材料として例えばアゾ有機金属錯体を用いることができる。
図2は、本発明の一実施の形態に係る光ディスクの一例として、追記型片面1層光ディスク100の構成を説明する図である。
図2に例示されるように、この光ディスク100は、例えばポリカーボネート(PC)等の合成樹脂材料で円盤状に形成された透明樹脂基板10を備えている。この透明樹脂基板10には、同心円状またはらせん状に溝(グルーブ)が形成されている。この透明樹脂基板10は、スタンパを用いて射出成形により製造することができる。
この記録層12を形成する有機色素としては、その吸収極大波長領域が記録波長(例えば405nm)よりも長波長側にシフトしているものを用いることができる。また、記録波長領域において吸収が消滅しているのではなく、その長波長領域(例えば450nm〜600nm)でも相当の光吸収を有するように設計される。
アゾ化合物は芳香環を持っており、その芳香環の構造はもちろんのこと、芳香環に様々な置換基を持たせることで、記録特性や保存特性、再生安定性などを最適化することが可能となる。この置換基は、嵩高いほど再生光耐久性が向上する傾向にあるが、記録時の感度も悪くなる傾向にあるため、どちらの特性も良好となるような置換基の選択が重要となる。また、この置換基は、溶剤への溶解度にも関与している。
表面に同心円またはスパイラル形状のグルーブ及びランドが形成された、120mmの直径、0.6の厚さを有する例えばポリカーボネート等の透明樹脂基板を用意した。
続いて、上記透明樹脂基板上に、スピンコートによりTFP溶液を塗布し、有機色素層を形成した。塗布後の有機色素層のグルーブ底からの厚みは60nmとした。得られた有機色素層上にAg合金の光反射層をスパッタリングにより100nm積層し、有機色素層と光反射層とが積層された記録層を得た。
以上のようにして作製した情報記録媒体(片面1層Rの評価ディスク)を用いて再生信号の評価実験を行った。
評価に用いた装置は、パルステック社製の光ディスク評価装置ODU−1000であり、この装置のレーザの波長は405nm、NAは0.65である。再生時の線速度は6.61m/sとした。記録速度は、再生時の線速度6.61m/sを1倍速とすると、1倍速の6.61m/s、4倍速の26.44m/sとした。記録信号は8−12変調されたランダムデータであり、図7に示すような、記録パワー(ピークパワー)と2種類のバイアスパワー1,2を含むレーザ波形を用いて情報の記録を行った。その際の記録条件を、以下に述べる。
標準速と2倍速について、最適な記録パワーを調べる時に使用する記録波形(記録時の露光条件)について図7を用いて説明する。記録時の露光レベルとして記録パワー(ピークパワー:Peak power)、バイアスパワー1(Bias power 1)、バイアスパワー2(Bias power 2)、バイアスパワー3(Bias power 3)の4レベルを持ち、長さの長い(4T以上の)記録マーク9形成時には記録パワー(ピークパワー:Peak power)とバイアスパワー3(Bias power 3)の間でマルチパルスの形で変調される。この実施の形態ではチャネルビット長Tに対する最小マーク長は2Tとなっている。この2Tの最小マークを記録する場合には、図7に示すように、バイアスパワー1(Bias power 1)の後で記録パワー(ピークパワー:Peak power)レベルの1個のライトパルスを使用し、ライトパルスの直後は一度バイアスパワー2(Bias power 2)になる。3Tの長さの記録マーク9を記録する場合には、バイアスパワー1(Bias power 1)の後にくる記録パワー(ピークパワー:Peak power)レベルのファーストパルスとラストパルスの2個のライトパルスを露光した後、一旦バイアスパワー2(Bias power 2)になる。4T以上の長さの記録マーク9を記録する場合には、マルチパルスとラストパルスで露光した後、バイアスパワー2(Bias power 2)になる。
0.00T≦TELP≦1.00T (eq.02)
1.00T≦TEFP≦1.75T (eq.03)
−0.10T≦TSLP≦1.00T (eq.04)
0.00T≦TLC ≦1.00T (eq.05)
0.15T≦TMP ≦0.75T (eq.06)
とする。
さらに、この実施の形態では、記録マークの長さ(Mark length)とその直前/直後のスペース長(Leading/Trailing space length)に応じて、上記各パラメーターの値を変化できるようにしている。
実施例2
色素として、化学式C116H76Cu4N20O20で示されるもの(以下色素Rとする)を用いた以外は実施例1と同様に作製した情報記録媒体に、情報記録を行った。色素Rの最大吸収波長は442nm、分解温度は330℃であった。
なお、実施例2の結果では変調度の比が1.0となっているが、他の実験例では変調度の比が1.05となったものがあるため、最も望ましい値としては1.05となる(図1参照)。
実施例1と同様の情報記録媒体に、4倍速のみ記録パワーを変えて記録を行った。4倍速での記録パワーはPw1=12.8mW、Pw2=9.0mW、Pb1=5.5mW、Pb2=5.5mWとした。変調度は1倍速で0.43、4倍速で0.36となり、M4x/M1x=0.86となった。4倍速でのSbERは6.6×10−5、PRSNRは14.2となり、目標値(SbERが5×10−5以下、PRSNRが15以上)に達することができなかった。
色素として、化13の化学式で示されるものを用いた以外は実施例1と同様に作製した情報記録媒体に、情報記録を行った。
化13の色素は有機金属錯体のアニオン部とシアニンのカチオン部から成り立っており、最大吸収波長は422nmであった。
本発明によれば、450nm以下の半導体レーザーを用いて情報を記録再生することが可能な情報記録媒体において、
0.87≦ M4x/M1x≦1.05
を満たすようにすれば、少なくとも1倍速から4倍速といった広範囲の記録線速度においても高品位な記録特性を得ることが可能となる。
次に、上述した光ディスクに記録された情報を再生する光ディスク装置について説明する。図9は、光ディスクを再生するための光ディスク装置の概略構成を示すブロック図である。図9に示すように、光ディスクは例えば片面2層タイプの光ディスクである。光源には短波長の半導体レーザ光源120が用いられる。その出射光の波長は、例えば400nm〜410nmの範囲の紫色波長帯のものである。半導体レーザ光源120からの出射光110は、コリメートレンズ121により平行光となり偏光ビームスプリッタ122、λ/4板123を透過して、対物レンズ124に入射される。その後、光ディスクDの基板を透過し、各情報記録層に集光されるようになっている。光ディスクDの情報記録層による反射光111は、再び光ディスクDの基板を透過し、対物レンズ124、λ/4板123を透過し、偏光ビームスプリッタ122で反射された後、集光レンズ125を透過して光検出器126に入射される。
Claims (6)
- 同心円またはスパイラル形状のグルーブ及びランドが形成された透明樹脂基板と、前記透明樹脂基板の前記グルーブ及び前記ランド上に形成された記録層とを少なくとも有し、450nm以下の半導体レーザーを用いて情報を記録再生することが可能な情報記録媒体において、
前記情報記録媒体に記録された情報を再生することで、
0.87≦M4x/M1x≦1.05
を満たすことを特徴とする情報記録媒体。
なお、式中、M4xは4倍速で記録したときの変調度、M1xは1倍速で記録したときの変調度を表す。 - 前記記録層は有機色素層であり、記録層の上に光反射層を含むことを特徴とする請求項1に記載の情報記録媒体。
- 前記有機色素層は、有機金属錯体を含有することを特徴とする請求項2に記載の情報記録媒体。
- 前記有機金属錯体は、アゾ有機金属錯体であることを特徴とする請求項3に記載の情報記録媒体。
- 前記有機色素層は、その記録前の吸収極大波長が、記録レーザー波長−10nm乃至50nmの範囲にあることを特徴とする請求項2乃至4のいずれか1項に記載の情報記録媒体。
- 請求項1記載の情報記録媒体にレーザ光を照射する照射手段と、
前記照射手段によって照射された前記レーザ光からの反射光を受光する受光手段と、
前記受光手段によって受光された前記反射光に基づいて、前記光ディスクを再生する再生手段とを有することを特徴とするディスク装置。
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JP2007213782A (ja) * | 2006-01-13 | 2007-08-23 | Mitsubishi Kagaku Media Co Ltd | 光記録媒体 |
WO2007105336A1 (ja) * | 2006-03-13 | 2007-09-20 | Kabushiki Kaisha Hayashibara Seibutsu Kagaku Kenkyujo | メチン系色素とその用途 |
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TWI401679B (zh) | 2013-07-11 |
US20090092035A1 (en) | 2009-04-09 |
GB2453236A (en) | 2009-04-01 |
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US8310913B2 (en) | 2012-11-13 |
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