JPH0512715A - 光記録媒体 - Google Patents

光記録媒体

Info

Publication number
JPH0512715A
JPH0512715A JP3162791A JP16279191A JPH0512715A JP H0512715 A JPH0512715 A JP H0512715A JP 3162791 A JP3162791 A JP 3162791A JP 16279191 A JP16279191 A JP 16279191A JP H0512715 A JPH0512715 A JP H0512715A
Authority
JP
Japan
Prior art keywords
light
recording
shutter layer
optical
optical 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
JP3162791A
Other languages
English (en)
Inventor
Fumio Matsui
文雄 松井
Fumihiko Yokogawa
文彦 横川
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 JP3162791A priority Critical patent/JPH0512715A/ja
Priority to US07/862,373 priority patent/US5246758A/en
Priority to DE19924214978 priority patent/DE4214978A1/de
Publication of JPH0512715A publication Critical patent/JPH0512715A/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
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • G11B7/00455—Recording involving reflectivity, absorption or colour changes
    • 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
    • G11B7/243—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
    • G11B2007/24312—Metals or metalloids group 14 elements (e.g. Si, Ge, Sn)
    • 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
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    • 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
    • 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
    • G11B7/243—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
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    • 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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    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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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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    • 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
    • G11B7/248—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 porphines; azaporphines, e.g. phthalocyanines
    • 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
    • G11B7/253—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
    • G11B7/2533—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 comprising resins
    • 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
    • G11B7/253—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
    • G11B7/2533—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 comprising resins
    • G11B7/2534—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 comprising resins polycarbonates [PC]
    • 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
    • G11B7/2572—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
    • 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
    • G11B7/258—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 reflective layers
    • G11B7/2585—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 reflective layers based on aluminium
    • 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
    • G11B7/258—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 reflective layers
    • G11B7/259—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 reflective layers based on silver
    • 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
    • G11B7/258—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 reflective layers
    • G11B7/2595—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 reflective layers based on gold
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/913—Material designed to be responsive to temperature, light, moisture
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/146—Laser beam
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
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    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Abstract

(57)【要約】 【目的】 現状のままの技術でスポット径をあたかも小
さくし、従来、読み取れなかった高密度記録された記録
ピット情報の読取りを可能にした光記録媒体を提供す
る。 【構成】 記録膜に読出光又は記録光が入射する手前の
位置に光シャッタ層を設け、該光シャッタ層は、読出光
が照射される前は該光を透過しない発色状態にあり、読
出光の照射により照射部分の中央部分が温度上昇すると
ともに部分的に消色して光透過性になる物質を主成分と
して含有するように構成した。

Description

【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、光透過性の基板の上に
記録膜を有する書込み可能な光記録媒体、特に高密度記
録化が向上された光記録媒体に関する。
【０００２】
【従来の技術】従来、いわゆる書込み可能な光記録媒体
に関しては、記憶容量を向上させるために、高密度記録
可能な種々の媒体構成が試みられたり、提案がなされた
りしている。
【０００３】例えば従来の光記録ディスクにおいて、
ピットとピットの距離を詰めたり、トラックピッチ間を
詰める方法や、例えば、光と電気等の多数の刺激に個
々に応答する物質を記録物質に用いたりする方法や、
基板上に数種の色素膜を順次積層した、いわゆる波長多
重光記録媒体や、格段の高密度記録が可能であるとさ
れて注目されている固体メモリとしてのＰＨＢ（Photo
Chemical Burning）等のアプローチがなされている。
【０００４】しかしながら、上記〜の方法は現技術
レベルでは早急に実現できる可能は少なく、上記の方
法のみが既存技術の延長でかつ実現可能である。
【０００５】
【発明が解決しようとする課題】しかしながら、上記
の方法では、ピットとピットの距離を詰め、トラックピ
ッチ間を詰めた状態での記録（書込み）はできるもの
の、現行の読出し光のスポット径では読取りが出来ない
という問題がある。すなわち、記録（書込み）は光ピー
ク強度と記録膜の感度との関係より、現行の記録光のス
ポット径で、該スポット径よりも小さい径の記録ピット
の形成が可能となるが、この記録ピットをクロストーク
なく読み取るには現行の読み取り光のスポット径をさら
に小さくしなけれならない。スポット径（Ｄ）は、Ｄ＝
λ（波長）／ＮＡ（レンズの開口比）で表わされ、スポ
ット径（Ｄ）を小さくするためには、ＮＡ値を大きく
し、λを小さくする必要がある。ＮＡ値を大きくするた
めには開口半角を大きくとる必要があるが、レンズと記
録媒体とのワーキングディスタンスをある程度とる必要
があり、ＮＡ値を現行より大きく取ることは困難であ
る。また、ＳＨＧ，ＴＨＧ等の開発に伴い、λの短波長
化も理論的には可能であるが実用化までには至っていな
い。
【０００６】このような実情のもと、本発明は創案され
たものであり、その目的は、現状のままの技術でスポッ
ト径をあたかも小さくし、従来、読み取れなかった高密
度記録された記録ピット情報の読取りを可能にした光記
録媒体を提供することにある。
【０００７】
【課題を解決するための手段】上記課題を解決するため
本発明の光記録媒体は、基板の上に記録膜を有する光記
録媒体において、該記録膜に読出光又は記録光が入射す
る手前の位置に光シャッタ層を設け、該光シャッタ層
は、読出光が照射される前は該光を透過しない発色状態
にあり、読出光の照射により照射部分の中央部分が温度
上昇するとともに部分的に消色して光透過性になる物質
を主成分として含有するように構成した。
【０００８】
【作用】本発明の光記録媒体に読出光のスポット照射が
行われると、光シャッタ層のスポット照射部分の、特に
光エネルギーの強い中央部分が局部的に温度上昇し、読
出光のスポット径以下の径の部分が消色して、この消色
部分にのみ読出光が通過するようになる。
【０００９】
【実施例】本発明の書込み可能な光記録媒体を図１およ
び図２に基づいて説明する。図１は本発明の光記録媒体
の一部を切り欠いた概略斜視図であり、図２は図１の切
欠部Ａ部の部分拡大断面図である。
【００１０】本発明の光記録媒体１は、基板１１の上に
光シャッタ層１２を有し、この光シャッタ層１２の上に
記録膜１３を有し、この記録膜１３の上に光反射層１４
を有する。
【００１１】基板１１は、光透過の特性を有するディス
ク状基板であり、通常、記録膜が形成される側の面には
トラッキング用のグルーブが形成されている。この基板
１１は、生産性向上の観点から、いわゆる射出成形樹脂
基板を用いることが好ましく、このものは、例えば、ポ
リカーボネート樹脂（ＰＣ）、ポリメタクリル酸メチル
樹脂（ＰＭＭＡ）等の透明材料から形成される。このよ
うな基板１１の厚さは１．０〜１．５mm程度とされる。
【００１２】このような基板１１の上には、光シャッタ
層１２が形成される。この光シャッタ層１２には、シャ
ッタ特性を有する物質が主成分として含有される。この
物質は通常の状態で、読出光又は記録光を透過させない
発色状態にあり、一定の温度上昇に伴って消色して光透
過性の状態になる物質である。従って、読出光のスポッ
ト照射が行われると、スポット照射部分の、特に光エネ
ルギーの強い中央部分が局部的に温度上昇し、読出光の
スポット径以下の径の部分が消色して、この消色部分に
のみ読出光が通過するようになる。シャッタ特性を有す
る具体的な物質としては、スピロピラン、スピロナフト
オキサジン、フルギドもしくはジアリールエテン系の各
化合物またはラクトン系、フルオラン系物質などが挙げ
られる。光シャッタ層１２には、適当なバインダを含有
させてもよい。このように形成される光シャッタ層１２
の厚さは、光を不透過せしめるに十分な値、具体的には
０．０２〜１μｍ程度である。
【００１３】このような光シャッタ層１２の上には記録
膜１３が成膜される。この記録膜１３には、例えば、シ
アニン系色素、フタロシアニン系色素等の有機色素が用
いられる。有機色素を含有する記録膜１２は、例えばス
ピンコート法等の常用手段により塗設される。塗設され
る記録膜の厚さは２０〜３０００ｎｍ程度である。な
お、塗布に用いる溶媒としては、公知の種々のものが用
いられ、例えば、ジアセトンアルコール、エチルセロソ
ルブ、メチルセロソルブ、イソホロン、メタノール、テ
トラフルオロプロパノール、ジクロロエタン等が挙げら
れる。
【００１４】なお、記録膜１３は、その他公知の種々の
光記録可能な材質、例えばピット形成により記録される
Ｔｅ系の無機材料、Ａｓ−Ｔｅ−Ｇｅ系，Ｓｎ−Ｔｅ−
Ｓｅ系，ＴｅＯx 系，Ｓｂ2 Ｓｅ3 ，Ｂｉ2 Ｔｅ3 等の
相変化を利用した記録材料等が用いられ得る。
【００１５】このような記録膜１３の上には、光反射層
１４が設けられる。光反射層１４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１４の厚さは、０．
０２〜２．０μｍ程度とされる。
【００１６】なお、図３に示されるごとく、光反射層１
４に変えて、保護層１５を設けた構成としてもよい。保
護層１５は、一般に、紫外線硬化性樹脂をスピンコート
して塗設した後、紫外線を照射し、塗膜を硬化させて形
成する。その他、エポキシ樹脂、アクリル樹脂、シリコ
ーン樹脂、ウレタン樹脂等が保護層１５の材質として用
いられる。このような保護層１５の厚さは、通常、１〜
１０μｍ程度である。
【００１７】なお、前記記録膜１３と光反射層１４の間
には、光吸収、光反射効率を上げるための中間層を設け
てもよい。また、いわゆる両面記録可能なエアーサンド
イッチ構造としてもよい。さらに、本発明の光シャッタ
層は、通常のいわゆるＣＤ、ＬＤなどのような書き込み
可能な記録膜を有しない媒体に応用してもよい。
【００１８】以下、具体的実験例を示して本発明をさら
に詳細に説明する。実験例 本発明サンプルの作製 予め、記録としてのプリピットが射出成形によって形成
されている直径１２０mm、厚さ１．２mmのＣＤ用ポリカ
ーボネート基板１１を用いた。なお、ピット形成に際し
て、ピットとピットの距離を詰め、従来のものに比べて
４倍の高密度記録とした。このような基板１１の上（ピ
ット形成側）に光シャッタ層１２をスピンコート法で形
成した。
【００１９】光シャッタ層１２は、下記構造式［１］お
よび［２］で示される物質を１：１の割合で混合して形
成した。
【００２０】
【化１】
【００２１】
【化２】 このように形成された光シャッタ層１２の波長と透過率
との関係が図４に示される。この図に示されるように通
常、使用されるレーザの波長７８０〜８３０ｎｍ付近で
は、消色して８０％以上の透過率を有することがわか
る。
【００２２】ついで、この光シャッタ層１２の上に、Ａ
ｕからなる光反射層を真空蒸着法で１０００Å厚さに設
層し、本発明のサンプルを作製した。比較サンプルの作製 光シャッタ層１２を設けなかった以外は上記本発明サン
プルと同様にして比較サンプルを作製した。
【００２３】これら両サンプルについて、従来の方法と
同様の方法で実際に再生したところ（再生波長：７８０
ｎｍ，再生出力：０．５ｍＷ）本発明サンプルについて
はクロストークなく読出しし得ることが確認出来たが、
比較サンプルについては、クロストークが発生し読出し
出来なかった。
【００２４】
【発明の効果】上記の結果より本発明の効果は明らかで
ある。すなわち、本発明の光記録媒体は記録膜に読出光
又は記録光が入射する手前の位置に光シャッタ層を設
け、該光シャッタ層は、読出光が照射される前は該光を
透過しない発色状態にあり、読出光の照射により照射部
分の中央部分が温度上昇するとともに部分的に消色して
光透過性になる物質を主成分として含有するので、従
来、読み取れなかった高密度記録された記録ピット情報
の読取りが可能になった。
【図面の簡単な説明】
【図１】本発明の光記録媒体の一部を切り欠いた概略斜
視図である。
【図２】図１の切欠部Ａ部の部分拡大断面図である。
【図３】本発明の第２実施例の構成をしめす部分拡大断
面図である。
【図４】本発明サンプルで用いた光シャッタ層の波長と
透過率との関係を示すグラフである。
【符号の説明】
１…光記録媒体 １１…基板 １２…光シャッタ層 １３…記録膜 １４…光反射層 １５…保護層

Claims (2)

    【特許請求の範囲】
  1. 【請求項１】 基板の上に記録膜を有する光記録媒体に
    おいて、 該記録膜に読出光又は記録光が入射する手前の位置に光
    シャッタ層を設け、 該光シャッタ層は、読出光が照射される前は該光を透過
    しない発色状態にあり、読出光の照射により照射部分の
    中央部分が温度上昇するとともに部分的に消色して光透
    過性になる物質を主成分として含有することを特徴とす
    る光記録媒体。
  2. 【請求項２】 前記サーモクロミズム物質は、スピロピ
    ラン、スピロナフトオキサジン、フルギドもしくはジア
    リールエテン骨格を有するフォトサーモクロミズム物質
    またはラクトン系、フルオラン系のケミサーモロクミズ
    ム物質である請求項１記載の光記録媒体。
JP3162791A 1991-07-03 1991-07-03 光記録媒体 Pending JPH0512715A (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP3162791A JPH0512715A (ja) 1991-07-03 1991-07-03 光記録媒体
US07/862,373 US5246758A (en) 1991-07-03 1992-04-02 Optical recording medium
DE19924214978 DE4214978A1 (de) 1991-07-03 1992-05-06 Optisches aufzeichnungsmedium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3162791A JPH0512715A (ja) 1991-07-03 1991-07-03 光記録媒体

Publications (1)

Publication Number Publication Date
JPH0512715A true JPH0512715A (ja) 1993-01-22

Family

ID=15761278

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3162791A Pending JPH0512715A (ja) 1991-07-03 1991-07-03 光記録媒体

Country Status (3)

Country Link
US (1) US5246758A (ja)
JP (1) JPH0512715A (ja)
DE (1) DE4214978A1 (ja)

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JPH06162564A (ja) * 1992-11-17 1994-06-10 Victor Co Of Japan Ltd 光記録媒体
US5576084A (en) * 1993-11-11 1996-11-19 Victor Company Of Japan, Ltd. Optical recording medium and the producing method of the optical recording medium
US5631056A (en) * 1994-03-31 1997-05-20 Victor Company Of Japan, Ltd. Optical recording medium
US7397755B2 (en) 2002-03-05 2008-07-08 Sharp Kabushiki Kaisha Optical information recording medium
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
US8125881B2 (en) 2004-08-04 2012-02-28 Sharp Kabushiki Kaisha Optical information recording medium, reproduction method and optical information processing device using the same
US8691357B2 (en) 2009-10-01 2014-04-08 Lintec Corporation Pressure-sensitive adhesive sheet for optical data recording medium, optical data recording medium, and method and device for reproducing data from optical data recording medium

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JPH0528498A (ja) * 1991-07-19 1993-02-05 Ricoh Co Ltd 光照射方法並びに光学的情報記録媒体及びそれを用いた記録方法と再生方法
US5472759A (en) * 1993-12-16 1995-12-05 Martin Marietta Corporation Optical volume memory
US5529864A (en) * 1993-12-16 1996-06-25 Canon Kabushiki Kaisha Optical recording medium having mask layer
JPH07169057A (ja) * 1993-12-16 1995-07-04 Sanyo Electric Co Ltd 光記録媒体及びその記録再生方法
JPH07311979A (ja) * 1994-03-24 1995-11-28 Sanyo Electric Co Ltd 光記録媒体及びその再生方法
US5607739A (en) * 1995-03-07 1997-03-04 Eastman Kodak Company Temperature sensor and method for optical disk
US6191384B1 (en) 1998-05-05 2001-02-20 Tapematic S.P.A. Apparatus for trimming dye coated on a recordable disc substrate and related method
KR20020001738A (ko) * 1999-12-02 2002-01-09 하야시바라 켄 스티릴색소
KR100501829B1 (ko) * 2001-07-30 2005-07-20 한국화학연구원 디아릴에텐 유도체와 이를 이용한 광변색 박막
AU2003250426A1 (en) * 2002-09-06 2004-03-29 Koninklijke Philips Electronics N.V. Multi-stack optical information carrier
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

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06162564A (ja) * 1992-11-17 1994-06-10 Victor Co Of Japan Ltd 光記録媒体
US5576084A (en) * 1993-11-11 1996-11-19 Victor Company Of Japan, Ltd. Optical recording medium and the producing method of the optical recording medium
US5631056A (en) * 1994-03-31 1997-05-20 Victor Company Of Japan, Ltd. Optical recording medium
US7397755B2 (en) 2002-03-05 2008-07-08 Sharp Kabushiki Kaisha Optical information recording medium
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
US8125881B2 (en) 2004-08-04 2012-02-28 Sharp Kabushiki Kaisha Optical information recording medium, reproduction method and optical information processing device using the same
US8691357B2 (en) 2009-10-01 2014-04-08 Lintec Corporation Pressure-sensitive adhesive sheet for optical data recording medium, optical data recording medium, and method and device for reproducing data from optical data recording medium

Also Published As

Publication number Publication date
US5246758A (en) 1993-09-21
DE4214978A1 (de) 1993-01-07

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