JP4786870B2 - 光情報記録媒体 - Google Patents
光情報記録媒体 Download PDFInfo
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- JP4786870B2 JP4786870B2 JP2003573641A JP2003573641A JP4786870B2 JP 4786870 B2 JP4786870 B2 JP 4786870B2 JP 2003573641 A JP2003573641 A JP 2003573641A JP 2003573641 A JP2003573641 A JP 2003573641A JP 4786870 B2 JP4786870 B2 JP 4786870B2
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- G—PHYSICS
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- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
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- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
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- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
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- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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Description
そこで、記録容量を向上させるために、いわゆる書き込み可能な光記録媒体として、種々の媒体構成が試みられているとともに、高密度での記録再生を実現するために、例えば、i)記録再生用のレーザー光波長を短くすること、ii)光情報記録媒体に集光する対物レンズNA(開口度)を大きくすること、iii)光情報記録媒体の記録層を多層にすること、iv)光情報記録媒体にマスク層を形成してレーザー光の光スポット径を実質的小さくすること等の方法が試みられている。
光情報記録媒体にマスク層を形成して実質的スポット径を小さくする手法は、例えば、特開平5−12673号公報、特開平5−12715号公報、特開2001−35012号公報等に記載されている。
さらに、マスク層は、その組成変化又は色素反応により透過率や反射率を変化させていることから、例えば、100℃昇温させたとしても、それらの変化量は、室温に比較して、その物質のもつ物性量以上は変化させることができず、高い信号品質を得るには限界があった。
このような構成により、温度変化に伴って光の屈折率を変化させる性質を有する温度感応層を利用して、あるいは、温度変化に伴って光干渉効果が変化する性質をも併せて利用して、より高く、かつ安定した再生信号強度を得ることができる。
また、本発明によれば、上記光情報記録媒体に対して、温度感応層における光ビームスポット内に高温部と低温部とが発生するように光ビームを照射し、前記温度感応膜の高温部と低温部とで反射率及び/又は透過率が可逆的に変化し、高反射率の温度領域から反射する光に基づいて情報を再生する光情報記録媒体の再生方法が提供される。
これにより、高い信号品質を確保することができ、安定した再生を行うことができる。
基板は、通常、光の入射を妨げず、光情報記録媒体に適当な強度を付与し得るものであることが適当である。これにより、光が基板側から入射する型の光学記録媒体を構成することができる。基板を構成する材料としては、特に限定されるものではなく、例えば、ガラス;ポリカーボネート、アモルファスポリオレフィン、ポリイミド、PET、PEN、PES等のプラスチック、紫外線硬化型アクリル樹脂等が挙げられる。基板は、通常、0.1〜1.2mm程度の厚みを有することが適当である。
温度感応層は、例えば、温度感応膜の単層、温度感応膜と反射膜との積層層等により形成することができる。なお、温度感応層が積層層により形成される場合には、必ずしも温度感応膜と反射膜とが直接接触していなくてもよく、その間に別の層が配置されていてもよい。
この温度感応層は、光情報記録媒体において、光マスク層として、反射層として、あるいは光マスク層及び反射層の両機能層として利用することができる。
基板(凹凸有・無)/温度感応膜/保護層、
基板(凹凸有・無)/温度感応膜/反射膜/保護層、
基板(凹凸有・無)/温度感応膜/光吸収膜/反射膜/保護層、
基板(凹凸有・無)/温度感応膜/光吸収膜/断熱層/反射膜/保護層、
基板(凹凸有・無)/温度感応膜/記録層/保護層、
保護層/温度感応膜/基板(凹凸有・無)、
保護層/温度感応膜/反射膜/基板(凹凸有・無)、
保護層/温度感応膜/光吸収膜/反射膜/基板(凹凸有・無)、
保護層/温度感応膜/光吸収膜/断熱層/反射膜/基板(凹凸有・無)、
保護層/温度感応膜/記録層/基板(凹凸有・無)、
(空気層)/温度感応膜/基板(凹凸有・無)、
(空気層)/温度感応膜/反射膜/基板(凹凸有・無)、
(空気層)/温度感応膜/光吸収膜/反射膜/基板(凹凸有・無)、
(空気層)/温度感応膜/光吸収膜/断熱層/反射膜/基板(凹凸有・無)、
(空気層)/温度感応膜/記録層/基板(凹凸有・無)
保護層/温度感応膜/中間層(凹凸有)/…/温度感応膜/基板(凹凸有・無)、
(空気層)/温度感応膜/中間層(凹凸有)/…/温度感応膜/基板(凹凸有・無)、
保護層/温度感応膜/記録層/中間層(凹凸有)/…/温度感応膜/記録層/基板(凹凸有・無)、
(空気層)/温度感応膜/記録層/中間層(凹凸有)/…/温度感応膜/記録層/基板(凹凸有・無)
等が挙げられる。なお、空気層とは、温度感応膜側が大気に露出している状態を示す。
なお、本発明の光情報記録媒体は、ディスク状、いわゆる円盤状の光ディスクのみならず、カード状又はシート状等の形状のものであってもよいし、光磁気ディスク、相変化型光ディスク等、種々の光情報記録媒体であってもよい。
以下に、本発明の光情報記録媒体の実施の形態を図面に基づいて詳細に説明する。
本発明の光情報記録媒体は、例えば、図1に示すように、再生専用の光情報記録媒体10として、入射光11側から、透明基板12、温度感応膜13、反射膜14及び保護層15がこの順に形成されてなる。
透明基板12は、例えば、膜厚0.6mm程度のポリカーボネートから形成されており、その片面(内側)に、情報ピット及び案内溝が形成されている。温度感応膜13は、膜厚20nm程度のSnO2により形成されており、さらに反射膜14は、膜厚50nm程度のAl膜により形成されている。
この光情報記録媒体は、例えば、以下の方法により製造することができる。
最後に、これらの情報記録面及び温度感応膜13等を外部環境から保護するために紫外線硬化型アクリル樹脂等をスピンコートし、UV光照射により硬化させて保護層15を形成する。
この再生専用の光情報記録媒体は、情報を再生する際に、基板12の情報ピット又は案内溝に、基板側から再生光(レーザービーム)を導き、その反射光を再生信号としている。
このように、情報ピットが刻設された基板面(情報面)に対応する情報を、再生ビームスポットをより小さくすることによって、より大きな再生信号強度として、確実に再生することができる。
記録・再生用の光情報記録媒体20は、図2に示したように、入射光側から、透明基板12、記録・再生層16、温度感応膜13、反射膜14及び保護層15がこの順に形成されてなる。記録・再生層16は、例えば、SiNの誘電体膜、TbFeCoの記録膜、SiNの保護膜の積層構造により形成されている。
この記録・再生用の光情報記録媒体30は、図3に示したように、記録・再生層16と温度感応膜13とが入れ替わっていること以外、実質的に実施例2の光情報記録媒体と同様に構成される。
このような光情報記録媒体においては、再生時は、上記と実質的に同様に強力な再生信号を得ることができる。一方、記録時には、例えば、再生時よりも高いレーザーパワーで、温度感応膜を通して、記録層を熱することにより、記録することができる。
この記録・再生用の光情報記録媒体40は、図4に示したように、入射光側から、透明基板12、温度感応膜13a、記録・再生層16a、透明中間層17、温度感応膜13b、記録・再生層16b、反射膜14及び保護層15がこの順に形成されてなる。透明中間層は、透明基板12及び保護層15と同様の材料により、30μm程度の厚さで形成されている。
この光情報記録媒体は、透明基板上に、温度感応膜として215nmのZnO膜が形成されてなる。
この光情報記録媒体に、408nmの波長の光を照射すると、常温では反射率が19%と低いのに対して、200℃の高温では反射率が22%と高くなる。これにより、記録再生光ビームの高温部のみが実効ビーム径となり、本来のビーム径より小さなビーム径で記録再生ができるため、光ビームの回折限界より小さなマークの微小記録再生が可能となる。
さらに、本発明によれば、高い信号品質を確保することができ、安定した再生を行うことが可能となる。
Claims (3)
- 基板上に、再生光入射側から、ZnOからなる温度感応膜、情報を記録するための有機色素膜及び反射膜がこの順で形成されてなり、前記温度感応膜は、前記再生光の波長において光干渉効果を有し、再生ビームの回折限界より小さなマークの微小再生を可能とする膜であって、温度変化に基づいて屈折率が変化する性質を示すことを特徴とする光情報記録媒体。
- 基板上に、再生光入射側から、ZnOからなる温度感応膜、誘電体膜、情報を記録するための光磁気膜、誘電体膜、反射膜がこの順で形成されてなり、前記温度感応膜は、前記再生光の波長において光干渉効果を有し、再生ビームの回折限界より小さなマークの微小再生を可能とする膜であって、温度変化に基づいて屈折率が変化する性質を示すことを特徴とする光情報記録媒体。
- 基板上に、再生光入射側から、ZnOからなる温度感応膜、誘電体膜、情報を記録するための相変化膜、誘電体膜、反射膜がこの順で形成されてなり、前記温度感応膜は、前記再生光の波長において光干渉効果を有し、再生ビームの回折限界より小さなマークの微小再生を可能とする膜であって、温度変化に基づいて屈折率が変化する性質を示すことを特徴とする光情報記録媒体。
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JP3832659B2 (ja) * | 2003-06-06 | 2006-10-11 | シャープ株式会社 | 光情報記録媒体、それを用いた記録方法、再生方法、光情報記録装置、および光情報再生装置 |
JP4647241B2 (ja) * | 2003-08-04 | 2011-03-09 | シャープ株式会社 | 光記録媒体原盤の製造方法、光記録媒体スタンパの製造方法、及び光記録媒体の製造方法 |
JP2005302275A (ja) * | 2004-03-18 | 2005-10-27 | Sharp Corp | 光情報記録媒体、記録再生方法、ならびに記録再生装置 |
EP1740387A1 (en) * | 2004-04-20 | 2007-01-10 | Koninklijke Philips Electronics N.V. | Record carrier and method of recording an image |
JP4298667B2 (ja) * | 2004-08-04 | 2009-07-22 | シャープ株式会社 | 光情報記録媒体、並びにそれを用いた再生方法および光情報処理装置 |
US20080031124A1 (en) * | 2004-09-28 | 2008-02-07 | Eiji Muramatsu | Recording Medium, Recording Apparatus And Method, And Computer Program |
JP2006269040A (ja) * | 2005-02-28 | 2006-10-05 | Sharp Corp | 光情報記録媒体、及び光情報記録媒体再生装置 |
US8243577B2 (en) * | 2006-07-27 | 2012-08-14 | Sharp Kabushiki Kaisha | Optical information recording medium, reproducing device for optical information recording medium, and reproducing method for optical information recording medium |
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JP3192685B2 (ja) | 1991-07-03 | 2001-07-30 | 三菱電機株式会社 | 光ディスク装置 |
US5420846A (en) * | 1991-08-08 | 1995-05-30 | Hitachi, Ltd. | Recording medium having a plurality of nonlinear transmission characteristics |
US5610879A (en) * | 1993-03-05 | 1997-03-11 | Matsushita Electric Industrial Co. Ltd. | Optical reproducing device, optical reproducing method using the same, and optical record medium used in the same |
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JPH10320857A (ja) * | 1997-03-17 | 1998-12-04 | Toshiba Corp | 光記録媒体およびその超解像再生方法 |
JP2000229479A (ja) * | 1998-12-09 | 2000-08-22 | Tdk Corp | 光記録媒体 |
JP2001032935A (ja) * | 1999-05-14 | 2001-02-06 | Ntn Corp | ピストンリング |
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JP2001084639A (ja) * | 1999-09-16 | 2001-03-30 | Toshiba Corp | 積層光記録媒体、積層光記録媒体の再生方法および積層光記録媒体の再生装置 |
JP2001101707A (ja) | 1999-09-28 | 2001-04-13 | Toshiba Corp | 光記録媒体、光記録再生装置および光記録再生方法 |
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JP2001202657A (ja) * | 2000-01-20 | 2001-07-27 | Victor Co Of Japan Ltd | 光ディスク |
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JP2002056573A (ja) * | 2000-08-11 | 2002-02-22 | Victor Co Of Japan Ltd | 光記録媒体 |
KR100415048B1 (ko) * | 2001-06-29 | 2004-01-13 | 한국과학기술연구원 | 고밀도 광 정보저장 매체 |
JP2003091875A (ja) | 2001-07-09 | 2003-03-28 | Ricoh Co Ltd | 相変化型光情報記録媒体、光情報記録再生装置及び方法、並びに光学フィルター |
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