JPH0628713A - 光ディスク - Google Patents

光ディスク

Info

Publication number
JPH0628713A
JPH0628713A JP4185041A JP18504192A JPH0628713A JP H0628713 A JPH0628713 A JP H0628713A JP 4185041 A JP4185041 A JP 4185041A JP 18504192 A JP18504192 A JP 18504192A JP H0628713 A JPH0628713 A JP H0628713A
Authority
JP
Japan
Prior art keywords
shutter layer
information
layer
high density
shutter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP4185041A
Other languages
English (en)
Inventor
Tetsuya Iida
哲哉 飯田
Shinichi Yokozeki
伸一 横関
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP4185041A priority Critical patent/JPH0628713A/ja
Priority to US08/087,320 priority patent/US5456961A/en
Priority to DE69318634T priority patent/DE69318634T2/de
Priority to EP93305481A priority patent/EP0580346B1/en
Publication of JPH0628713A publication Critical patent/JPH0628713A/ja
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—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
    • G11B7/257—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
    • G11B7/2578—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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/251—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials dispersed in an organic matrix
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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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24314—Metals or metalloids group 15 elements (e.g. Sb, Bi)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
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    • G11B2007/24302—Metals or metalloids
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
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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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    • G11B2007/25715—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 containing oxygen
    • G—PHYSICS
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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
    • G11B2007/25716—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 containing sulfur
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
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    • G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
    • G11B7/246—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes
    • G11B7/247—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes methine or polymethine dyes
    • G11B7/2472—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes methine or polymethine dyes cyanine
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    • G11B7/2572—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 organic materials
    • G11B7/2575—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 organic materials resins
    • 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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Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Dispersion Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

(57)【要約】 【目的】 情報を高密度に記録したり、あるいは高密度
に記録された情報の再生を正確に行う。 【構成】 基板の上に直接又は中間層を介して、読み出
し又は書き込みのために照射される光ビームの径を絞る
ためのシャッタ層を備え、該シャッタ層は、半導体微粒
子を含有するように構成する。

Description

【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、音声、映像等の各種情
報の信号を記録する光学式記録媒体である光ディスク、
特に情報を高密度に記録したり、あるいは高密度に記録
された情報の再生を正確に行うことができる光ディスク
に関する。
【０００２】
【従来の技術】一般に、光ディスクは中央部にセンター
ホールを有し、このセンターホールの外周に螺線状につ
ながった１本のトラックとして情報が記録される。従
来、この種の記録ディスクは、図４（ａ）に示すよう
に、アクリル樹脂（Polymethyl methacrylate;PMMA）等
の透明なディスク基板１１上に情報に対応する凹凸形状
の情報ピット部１２が形成され、この情報ピット部１２
が形成されたディスク基板１１上に高い反射率のアルミ
ニウム膜１５が蒸着され、このアルミニウム膜１５上に
プラスチック等の保護層１６を形成して構成される。
【０００３】前記構成に基づく記録ディスクから情報を
再生する場合には透明なディスク基板１１側からレーザ
光等の光ビーム３０を再生の対象となるトラックの情報
ピット部１２に投射し、図４（ｂ）に示すように情報ピ
ット部１２のないピット間の鏡面部で反射された反射光
３１が「明」として検出され、また情報ピット部１２で
反射された反射光３２が「暗」として検出される。この
ように「明」、「暗」の反射光により情報ピット部１２
の各記録ピット１２ａ，１２ｂ，１２ｃ…に対応する情
報が再生されることとなる。
【０００４】
【発明が解決しようとする課題】前記従来の光ディスク
及びその再生方法は以上のように構成されていたことか
ら、相隣るトラックのトラックピッチを狭くして情報を
高密度化して記録した場合には、この高密度化した記録
ディスクの複数のトラックに亘って光ビームが投射され
ることとなるという問題を有していた。即ち、光ビーム
の波長に基づいてビームスポットの直径が定まることか
ら一般に、スポット径を小径化することには限界があ
り、この限界を越えた狭いトラックピッチで情報が記録
されると、図４（ｃ）に示すように複数のトラックの各
情報ピット１２ａ，１２ｂ，１２ｃから反射光３２の
「暗」（又は明３１）という情報が同時に複数検出され
て情報再生を正確に行なえなくなるという不都合が生じ
ていた。
【０００５】また、この一方で、書き込み可能な記録膜
を備える光ディスクであって、情報を高密度に記録する
ことができる光ディスクの開発も要望されている。本発
明はこのような課題を解決するためになされたもので、
情報を高密度に記録することができる光ディスクまた
は、この記録された情報の再生を正確に行なうことがで
きる光ディスクを提供することを目的とする。
【０００６】
【課題を解決するための手段】上記課題を解決するため
本発明の光ディスクは、基板の上に直接又は中間層を介
して、読み出し又は書き込みのために照射される光ビー
ムの径を絞るためのシャッタ層を備え、該シャッタ層
は、半導体微粒子を含有するように構成した。
【０００７】
【作用】本発明の光ディスクの基板側から光照射が行な
われると、半導体微粒子を含有するシャッタ層でビーム
径が絞られる。
【０００８】すなわち、シャッタ層においては、ある光
強度以上の所だけ光が透過し、それ以外の所では光の透
過が抑制され、その結果としてビーム径がさらに絞られ
る。
【０００９】
【実施例】以下、本発明の光ディスクを図１〜図３に基
づいて説明する。図１には、位相差を利用して記録、再
生を行う、いわゆる位相ピットを備えた第１実施例とし
ての光ディスク１が示される。
【００１０】この光ディスク１は、基板１１と、この基
板１１の上に形成されたシャッタ層１７と、このシャッ
タ層１７の上に形成された光反射層１９とを備える。前
記基板１１は、通常、ディスク形状をなし、基板１１の
光ビームの光源側の面には平坦面１１ａが形成され、他
方の面１１ｂには音声、映像等の情報に対応する複数の
情報ピット部１２が形成される。
【００１１】基板１１は、通常、アクリル樹脂、ポリカ
ーボネート、ポリオレフィン系樹脂等の各種透明樹脂材
料から形成され、前記情報ピット部１２は、通常、基板
１１を射出成形などによって形成する時に同時に成形さ
れる。
【００１２】このような基板１１の情報ピット部１２側
の上には、読み出し又は書き込みのために照射される光
ビームの径を絞るためのシャッタ層１７が形成される。
このシャッタ層１７は、ガラス又は樹脂のマトリックス
の中に、ＣｄＳ、ＣｄＳｅ、ＣｄＳｘＳｅ1-x 、ＧａＡ
ｓ、アモルファスＳｉ、ＣｄＴｅ、ＣｄＳｅ、ＺｎＯ、
ＺｎＳ、ＺｎＳｅ、ＺｎＴｅ、ＧａＰ、ＧａＮ、ＡｌＡ
ｓ、ＡｌＰ、ＡｌＳｂ、およびアモルファスＳｉＣの中
から選ばれた少なくとも１種の半導体微粒子を分散させ
て形成される。
【００１３】このようなシャッタ層１７に含有される半
導体微粒子の含有量は、１〜８０ｍｏｌ％より好ましく
は、５〜７０ｍｏｌ％程度とされる。この値が８０ｍｏ
ｌ％を超えると、半導体微粒子どうしの凝縮がおこり、
微粒子として存在できないという不都合が生じ、この値
が１ｍｏｌ％未満となると、十分なシャッター効果が得
られない（シャッター開閉による透過率の差が小さい）
という不都合が生じる。
【００１４】含有される半導体微粒子の粒径は、０．１
〜５０ｎｍ、より好ましくは０．５〜３０ｎｍとされ
る。このような半導体微粒子を分散させるマトリックス
（母体）の材料としては、ソーダライムガラス、無アル
カリガラス、低アルカリガラス、石英ガラス等のガラス
や、ポリメチルメタクリレート、ポリカーボネート、ポ
リスチレン、アモルファスポリオレフィン、エポキシ等
の樹脂が用いられる。このようなマトリックス材料は、
用いる光源の波長で十分な透明度をもつことが必要とさ
れる。
【００１５】半導体微粒子をマトリックスに分散させる
方法は、マトリックスがガラスであるか樹脂であるかに
よって異なる。すなわち、マトリックス材料がガラスの
場合、高濃度の半導体構成成分を含むガラスを超急冷
法により作製し、その後の熱処理によって半導体微粒子
をガラスの中に析出させる方法、多孔質ガラスのポア
中に半導体微粒子を液相や気相より含浸する方法、半
導体微粒子が分散した溶液を、ゾルゲル法により固化す
る方法、スパッタなどの方法により半導体微粒子を含
むガラス薄膜を気相より成長させる方法などが挙げられ
る。
【００１６】この一方で、マトリックス材料が樹脂の場
合、半導体微粒子が分散させられた溶液と樹脂が溶解
された溶液とを混合し、この混合液を基板の上にスピン
コート法により成膜する方法、スパッタや蒸着などの
方法により、半導体微粒子を含む樹脂薄膜を気相により
成長させる方法などが挙げられる。
【００１７】このようにして形成されるシャッタ層１７
の厚さは、０．００５〜０．３μｍ程度とされる。シャ
ッタ層１７の作用を、図３に基づいて説明する。図３は
本発明のシャッタ層を設けることによって、光ビームの
径がさらに絞られることを説明するための概略説明図で
ある。すなわち図３（ａ）はシャッタ層を設けない状態
でのビームプロファイルであり、図３（ｂ）はシャッタ
層を設けた状態でのビームプロファイルである。（ａ）
および（ｂ）に示されるプロファイルから分かるよう
に、シャッタ層を設けることによってビーム径を著しく
絞ることができ、従来読み出し出来なかった（図３
（ａ））１つの記録ピットを確実に読み出すことが出来
る（図３（ｂ））。
【００１８】なお、本発明の光ディスクが対象としてい
る読み出し又は書き込みのための光ビーム波長は、３１
０〜８９０ｎｍであり、実際、具体的に用いる波長に応
じて、シャッタ層１７の組成が適宜、選定される。
【００１９】このようにして形成されたシャッタ層１７
の上には光反射層１９が形成される。光反射層１９は、
Ａｕ，Ａｇ，Ｃｕ，Ａｌ等の金属から構成され、このも
のは真空蒸着、スパッタリング、イオンプレーティング
等の各種真空成膜法で成膜される。このような光反射層
１９の厚さは０．０３〜０．３μｍ程度とされる。
【００２０】なお、本発明の基板１１とシャッタ層１７
との間や、シャッタ層１７と光反射層１９の間には、Ｚ
ｎＳ、ＳｉＯ2 あるいはこれらの混合物等の各種中間層
を設けてもよい。さらに光反射層１９の上には、各種保
護膜を設けてもよい。
【００２１】図２には、反射率の差を利用して記録、再
生を行ういわゆる反射率の差を生ぜしめるピットを備え
る光ディスク２が第２実施例として示される。この光デ
ィスク２は、基板１３と、この基板１３の上に形成され
たシャッタ層１７と、このシャッタ層１７の上に形成さ
れた記録膜１８とを備えている。この第２実施例で用い
られる基板１３の表面上には第１実施例のように記録ピ
ットが形成されておらず、その代りに後述する記録膜１
８が設けられ、この記録膜１８に記録ピット部が形成さ
れる。シャッタ層１７は、前記第１実施例ですでに説明
したそれと同様である。
【００２２】記録膜１８は光照射の記録により、光照射
された部分と、光照射されなかった部分との間で反射率
の差がとれるような材料から形成される。これらの材料
の一例を挙げると、非結晶質と結晶質との間の相変化を
利用して情報を行う、Ａｓ−Ｔｅ−Ｇｅ系、Ｓｎ−Ｔｅ
−Ｓｅ系、ＴｅＯｘ（０＜Ｘ＜２）、Ｓｂ2 Ｓｅ3 、Ｂ
ｉ2 Ｔｅ3 等の相変化タイプの記録膜材料がある。さら
に、Ｔｅ系材料の無機系の薄膜やシアニン色素、フタロ
シアニン色素等の有機色素薄膜を用いたピット形成によ
る記録材料等も記録膜１８材料の一例である。その他、
光磁気メモリーに用いられるＴｂＦｅＣｏ、ＧｄＣｏ、
ＰｔＣｏ等の材料も挙げられる。
【００２３】なお、本発明の第２実施例の基板１３とシ
ャッタ層１７との間や、シャッタ層１７と記録膜１８と
の間には、ＺｎＳ、ＳｉＯ2 、あるいはこれらの混合物
等の各種中間層を設けてもよい。
【００２４】さらに、記録膜１８の上には、Ａｕ、Ａ
ｇ、Ａｌ、Ｃｕ等の反射膜や、ＺｎＳ、ＳｉＯ2 等の保
護膜を設けても良い。なお、本実施例では主として読み
出し光のビーム径を絞ることを中心にして説明してきた
が、もちろん書き込み光のビーム径を絞り、高密度記録
に適用できることは言うまでもない。
【００２５】
【発明の効果】以上述べたように、本発明の光ディスク
では、基板の上に直接又は中間層を介して、読み出し又
は書き込みのために照射される光ビームの径を絞るため
のシャッタ層を備え、該シャッタ層は、半導体微粒子を
含有するように構成しているので、情報を高密度に記録
したり、あるいは高密度に記録された情報の再生を正確
に行うことができる。
【図面の簡単な説明】
【図１】本発明の光ディスクの一例の構造を説明するた
めの概略半片断面図である。
【図２】本発明の他の光ディスクの一例の構造を説明す
るための概略半片断面図である。
【図３】本発明のシャッタ層を設けることによって、光
ビームの径がさらに絞られることを説明するための概略
説明図であって、（ａ）はシャッタ層を設けない状態で
のビームプロファイルであり、（ｂ）はシャッタ層を設
けた状態でのビームプロファイルである。
【図４】（ａ）は情報が記録された状態を模式的に示す
ための光ディスクの部分切り欠き断面図であり、（ｂ）
は読み出しの原理を説明するための図、（ｃ）は高密度
に記録された情報の再生を行う場合に生ずる従来の不都
合を説明するための図である。
【符号の説明】
１，２…光ディスク １１，１３…基板 １７…シャッタ層

Claims (3)

    【特許請求の範囲】
  1. 【請求項１】 基板の上に直接又は中間層を介して、読
    み出し又は書き込みのために照射される光ビームの径を
    絞るためのシャッタ層を備え、該シャッタ層は、半導体
    微粒子を含有することを特徴とする光ディスク。
  2. 【請求項２】 前記シャッタ層は、ガラス又は樹脂のマ
    トリックスの中に、ＣｄＳ，ＣｄＳｅ、ＣｄＳｘＳｅ
    1-x 、ＧａＡｓ、アモルファスＳｉ、ＣｄＴｅ、ＣｄＳ
    ｅ、ＺｎＯ、ＺｎＳ、ＺｎＳｅ、ＺｎＴｅ、ＧａＰ、Ｇ
    ａＮ、ＡｌＡｓ、ＡｌＰ、ＡｌＳｂ、およびアモルファ
    スＳｉＣの中から選ばれた少なくとも１種の半導体微粒
    子を分散させてなることを特徴とする請求項１記載の光
    ディスク。
  3. 【請求項３】 前記半導体微粒子は、シャッタ層中に５
    〜７０ｍｏｌ％の割合で含有されることを特徴とする請
    求項１または請求項２に記載の光ディスク。
JP4185041A 1992-07-13 1992-07-13 光ディスク Pending JPH0628713A (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP4185041A JPH0628713A (ja) 1992-07-13 1992-07-13 光ディスク
US08/087,320 US5456961A (en) 1992-07-13 1993-07-08 High density optical disk
DE69318634T DE69318634T2 (de) 1992-07-13 1993-07-13 Optische Platte mit hoher Speicherdichte
EP93305481A EP0580346B1 (en) 1992-07-13 1993-07-13 High density optical disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4185041A JPH0628713A (ja) 1992-07-13 1992-07-13 光ディスク

Publications (1)

Publication Number Publication Date
JPH0628713A true JPH0628713A (ja) 1994-02-04

Family

ID=16163763

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4185041A Pending JPH0628713A (ja) 1992-07-13 1992-07-13 光ディスク

Country Status (4)

Country Link
US (1) US5456961A (ja)
EP (1) EP0580346B1 (ja)
JP (1) JPH0628713A (ja)
DE (1) DE69318634T2 (ja)

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JPH06162564A (ja) * 1992-11-17 1994-06-10 Victor Co Of Japan Ltd 光記録媒体
US6187406B1 (en) 1997-03-17 2001-02-13 Kabushiki Kaisha Toshiba Optical disk and optical disk drive
KR20010055397A (ko) * 1999-12-10 2001-07-04 구자홍 광 기록 매체
US7081328B2 (en) 2000-03-29 2006-07-25 Kabushiki Kaisha Toshiba Optical disk having super-resolution film
US7436755B2 (en) 2002-11-18 2008-10-14 Sharp Kabushiki Kaisha Optical information recording medium, recording and reproduction methods using the same, optical information recording device, and optical information reproduction device
US7556912B2 (en) 2003-06-06 2009-07-07 Sharp Kabushiki Kaisha Optical information recording medium, reproducting method using the same, and optical information processing device
US7682678B2 (en) 2003-06-06 2010-03-23 Sharp Kabushiki Kaisha Optical information recording medium, recording and readout methods using the same, optical information recording device, and optical information readout device
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JPH10340482A (ja) * 1997-06-09 1998-12-22 Hitachi Ltd 光情報記録媒体
US5874147A (en) * 1997-07-15 1999-02-23 International Business Machines Corporation Column III metal nitride films as phase change media for optical recording
JP2000011455A (ja) * 1998-06-29 2000-01-14 Hitachi Ltd 光情報記録媒体
US6337117B1 (en) * 1998-07-01 2002-01-08 Mitsubishi Chemical Corporation Optical memory device
JP4115050B2 (ja) * 1998-10-07 2008-07-09 キヤノン株式会社 電子線装置およびスペーサの製造方法
JP2001084643A (ja) * 1999-09-09 2001-03-30 Hitachi Ltd 光ディスク媒体
JP2001347756A (ja) * 2000-06-06 2001-12-18 Fuji Photo Film Co Ltd 光記録媒体とこれを用いた光記録方法
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NL8801327A (nl) * 1988-05-24 1989-12-18 Philips Nv Methode voor het optisch aftasten van een informatievlak en optische registratiedragers en aftastinrichtingen geschikt voor toepassing van de methode.
JP2666966B2 (ja) * 1988-06-13 1997-10-22 日本電信電話株式会社 非線形光学素子用半導体
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US6187406B1 (en) 1997-03-17 2001-02-13 Kabushiki Kaisha Toshiba Optical disk and optical disk drive
US6606291B2 (en) 1997-03-17 2003-08-12 Kabushiki Kaisha Toshiba Optical disk and optical disk drive
US6744717B2 (en) 1997-03-17 2004-06-01 Kabushiki Kaisha Toshiba Optical disk and optical disk drive
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US7081328B2 (en) 2000-03-29 2006-07-25 Kabushiki Kaisha Toshiba Optical disk having super-resolution film
US7436755B2 (en) 2002-11-18 2008-10-14 Sharp Kabushiki Kaisha Optical information recording medium, recording and reproduction methods using the same, optical information recording device, and optical information reproduction device
US8194513B2 (en) 2003-05-30 2012-06-05 Sharp Kabushiki Kaisha Optical data recording medium and method for reproducing recorded data
US8576688B2 (en) 2003-05-30 2013-11-05 Sharp Kabushiki Kaisha Optical data recording medium and method for reproducing recorded data
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Also Published As

Publication number Publication date
DE69318634D1 (de) 1998-06-25
DE69318634T2 (de) 1998-10-01
EP0580346A3 (ja) 1994-03-09
EP0580346A2 (en) 1994-01-26
EP0580346B1 (en) 1998-05-20
US5456961A (en) 1995-10-10

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