JP2012022734A - 光情報記録媒体および光情報記録方法 - Google Patents
光情報記録媒体および光情報記録方法 Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
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- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
【解決手段】多光子吸収化合物および1光子吸収化合物を有する記録層12と、記録層12を支持する支持体(ベース層11)を有し、多光子吸収化合物による多光子の吸収と1光子化合物による1光子の吸収に伴って気泡を発生し、当該気泡の有無による変調で情報が記録される光情報記録媒体を構成する。記録層12は、一形態としては、高分子バインダーを含み、加熱により気泡の消去が可能である。
【選択図】図1
Description
図1に示すように、光情報記録媒体の一例としての多層光記録媒体10は、支持体の一例としてのベース層11に、多数の記録層12および中間層13が設けられ、ベース層11の反対側は、カバー層14で覆われている。ベース層11と記録層12の間には、トラッキングのためのサーボ層15が設けられている。多層光記録媒体10の全体形状は、特に限定されず、ディスク状、カード状など、適宜、必要な形状にすることができる。
記録層12に用いる多光子吸収記録材料は、例えば、読出光の波長に線形吸収帯を持たない2光子吸収化合物であることが好ましい。
Rは置換基を表し、置換基としては、特に限定されず、具体的には、アルキル基、アルコキシ基、アルコキシアルキル基、アリールオキシ基、などが挙げられる。mは0以上4以下の整数を表す。
[実施例1]
1.記録材料
記録材料の作製に、以下の材料を用いた。
溶媒 メチルエチルケトン(MEK) 7.0g
2光子吸収色素 下記の化合物D−1 70mg
500mg
3L3つ口フラスコに化合物(L−11)120g、メタノール1200mlを入れ、攪拌しながらジイソプロピルアミン193mlを滴下した。完溶させた後、攪拌しながら、さらに酢酸銅一水和物 82.3gを加え、60〜65℃で2時間反応させた。室温に戻し、沈殿物をろ過し、メタノールにて洗浄し、乾燥を施し化合物(M−11)117gを得た。
上記の溶媒に、2光子吸収色素、1光子吸収色素、高分子バインダーを撹拌・溶解させた塗布液を作り、ガラス基板上にスピンコートにより膜を形成した。膜厚は1μmとした。なお、上記の2光子吸収色素は、記録光の波長(522nm)に線形吸収を持たない。また、作製された記録層の1光子吸収色素の記録光に対する吸収率(1光子吸収)は、1.8%であった。
記録光(パルスレーザ:波長522nm、繰り返し周波数3GHz、パルス幅500fsec、平均パワーPa=5〜50mW、ピークパワーPp=3〜33W)をピークパワー10Wで記録層に照射した。
記録層に対し、光軸方向に記録光の焦点位置を0.4μmずつ4μmの範囲(つまり、深さ方向で11点の位置)で動かし、各深さ位置(焦点位置)で、4点の記録(つまり、計44箇所での記録)をテストした。
記録条件は、記録時間を5μs〜5msの間で調整した。そして、記録マークが12個(隣接する焦点位置で3箇所、その各焦点位置で4個)ずつ記録できる記録時間[μs]をデータとして得た。
実施例1に対し、2光子吸収色素を添加せず、1光子吸収色素および高分子バインダーからなる記録層を作製した。材料の量、その他の条件は実施例1と同じである。
実施例1に対し、1光子吸収色素を添加せず、2光子吸収色素および高分子バインダーからなる記録層を作製した。材料の量、その他の条件は実施例1と同じである。
実施例1に対し、2光子吸収色素および1光子吸収色素を添加せず、高分子バインダーからなる記録層を作製した。材料の量、その他の条件は実施例1と同じである。
実施例1で気泡による記録マークを記録した光情報記録媒体について、80℃1時間、オーブンで加熱した。気泡による記録マークが消えた。すなわち、記録の消去が可能であることが確認された。
11 ベース層
12 記録層
13 中間層
14 カバー層
15 サーボ層
Claims (12)
- 多光子吸収化合物および1光子吸収化合物を有する記録層と、前記記録層を支持する支持体とを備え、前記多光子吸収化合物による多光子の吸収と前記1光子化合物による1光子の吸収に伴って気泡を発生し、当該気泡の有無による変調で情報が記録されることを特徴とする光情報記録媒体。
- 前記多光子吸収化合物および前記1光子吸収化合物の少なくとも一方は、光の吸収による温度の上昇により気泡を発生する発泡性材料であることを特徴とする請求項1に記載の光情報記録媒体。
- 前記記録層は、前記多光子吸収化合物および前記1光子吸収化合物とは別に、前記多光子吸収化合物および前記1光子吸収化合物の光の吸収による温度上昇により気泡を発生する気化材料を含むことを特徴とする請求項1に記載の光情報記録媒体。
- 前記記録層は、高分子バインダーを含み、加熱により気泡の消去が可能であることを特徴とする請求項1から請求項3のいずれか1項に記載の光情報記録媒体。
- 発生する気泡の大きさが0.01〜10μmの範囲にあることを特徴とする請求項1から請求項4のいずれか1項に記載の光情報記録媒体。
- 前記記録層は、厚みが0.01〜10μmであることを特徴とする請求項1から請求項5のいずれか1項に記載の光情報記録媒体。
- 前記記録層は複数層設けられ、
前記各記録層の間に、情報を記録するときに照射される記録光および情報を再生するときに照射される読出光のいずれも実質的に1光子吸収および多光子吸収することがない中間層をさらに備えることを特徴とする請求項6に記載の光情報記録媒体。 - 前記記録層は、前記記録光に対する1光子吸収の吸収率が1層あたり5%以下であることを特徴とする請求項7に記載の光情報記録媒体。
- 多光子吸収化合物および1光子吸収化合物を有する記録層と、前記記録層を支持する支持体とを備える光情報記録媒体に情報を記録する光情報記録方法であって、
記録すべき情報に応じて変調したパルスレーザ光を前記記録層に照射し、前記多光子吸収化合物の多光子吸収反応および前記1光子吸収化合物の1光子吸収反応を起こさせることで、前記変調に応じた位置に気泡を発生させて当該気泡の有無による変調で情報を記録することを特徴とする光情報記録方法。 - 請求項4に記載の光情報記録媒体に記録された情報の消去方法であって、
前記記録層を加熱することで、当該記録層に記録された情報を消去することを特徴とする消去方法。 - 前記記録層に焦点を合わせるように連続波レーザを照射することで、前記記録層を加熱することを特徴とする請求項10に記載の消去方法。
- 光情報記録媒体の全体を加熱することで、すべての前記記録層に記録された情報を消去することを特徴とする請求項10に記載の消去方法。
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