JPH08124218A - 光学情報記録媒体 - Google Patents

光学情報記録媒体

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Publication number
JPH08124218A
JPH08124218A JP6253326A JP25332694A JPH08124218A JP H08124218 A JPH08124218 A JP H08124218A JP 6253326 A JP6253326 A JP 6253326A JP 25332694 A JP25332694 A JP 25332694A JP H08124218 A JPH08124218 A JP H08124218A
Authority
JP
Japan
Prior art keywords
dielectric layer
layer
recording
disc
optical
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.)
Granted
Application number
JP6253326A
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English (en)
Other versions
JP2806274B2 (ja
Inventor
Shuichi Okubo
修一 大久保
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP6253326A priority Critical patent/JP2806274B2/ja
Priority to NL1001442A priority patent/NL1001442C2/nl
Priority to KR1019950036812A priority patent/KR100212369B1/ko
Publication of JPH08124218A publication Critical patent/JPH08124218A/ja
Priority to US08/762,307 priority patent/US5719006A/en
Priority to US08/959,032 priority patent/US5900347A/en
Application granted granted Critical
Publication of JP2806274B2 publication Critical patent/JP2806274B2/ja
Priority to US09/234,500 priority patent/US6140011A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • 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
    • 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
    • G11B7/0055—Erasing
    • G11B7/00557—Erasing involving phase-change media
    • 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
    • G11B7/252—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
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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
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
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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
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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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    • G11B7/24—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
    • 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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    • 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
    • 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
    • G11B2007/2571—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 group 14 elements except carbon (Si, Ge, Sn, Pb)
    • 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
    • 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
    • G11B2007/25715—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
    • G11—INFORMATION STORAGE
    • 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
    • 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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    • G11B7/257—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
    • 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
    • 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
    • G11B7/006—Overwriting
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    • 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
    • G11B7/2531—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 glass
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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
    • 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]
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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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    • G11B7/254—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 protective topcoat layers
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    • 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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    • G11B7/258—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
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/146—Laser beam

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Abstract

(57)【要約】 【目的】 マークエッジ記録を用いた相変化光ディスク
において、特に短波長光源を用いた高線速下でのマーク
エッジ記録においてジッタの小さな光学情報記録媒体を
提供する。 【構成】 基板１上に第１誘電体層２、記録層３、第２
誘電体層４、反射層５、第３誘電体層６、紫外線硬化樹
脂層７を順に積層し、反射層５として透過性の極薄金属
膜あるいはＳｉ、Ｇｅを用い、かつ、第３誘電体層６と
して屈折率が１．５より大きい誘電体を用いる。また、
ディスクの内周部と外周部で第３誘電体層６の膜厚を変
化させると、Ａｃ／Ａａの値を内周部と外周部で変化さ
せることができるので回転数一定の条件でディスクを使
用することができる。

Description

【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、熱履歴の違いにより誘
起される相変化にともなう光学定数の変化を利用して情
報の記録・消去を行う光学情報記録媒体すなわち相変化
光ディスクに関する。
【０００２】
【従来の技術】レーザ光の照射によって情報の記録・消
去・再生を行う光学情報記録媒体としては、光磁気ディ
スクや相変化光ディスクなどが知られている。このう
ち、例えば相変化光ディスクでは、図４に示すように、
基板１上に第１誘電体層２、記録層３、第２誘電体層
４、反射層５、紫外線硬化樹脂層６がこの順に設けられ
た４層構成が通常用いられる。情報の記録・消去はレー
ザ光の照射による昇温・冷却の熱履歴の違いによって誘
起される記録層の非晶質・結晶間の相変化を利用して行
われる。すなわち、記録層を溶融し急冷することにより
非晶質化させ記録を行い、また、結晶化温度以上に一定
時間保持することにより結晶化させ、消去を行う。信号
の再生は非晶質・結晶間の反射率差を利用して行われ
る。第１誘電体層２、記録層３、第２誘電体層４及び反
射層５のそれぞれの膜厚は、感度、Ｃ／Ｎ、消去率、書
換可能繰り返し回数などの観点から最適化される。誘電
体層としてはＺｎＳ−ＳｉＯ2 ，ＳｉＮ，ＳｉＯ2 等
が、また、記録層としてはＳｂＴｅ，ＧｅＳｂＴｅ，Ａ
ｇＩｎＳｂＴｅ等が、反射層としてはＡｌ，Ａｕ等が用
いられる。
【０００３】高密度化には、記録マークの両端に情報を
持たせるマークエッジ記録が有効である。しかし、信号
の再生に結晶・非晶質間の反射率差を利用している相変
化光ディスクでは、結晶状態の吸収率（Ａｃ）と非晶質
状態の吸収率（Ａａ）が異なる場合が多く、一般に、Ａ
ａがＡｃより大きくなっている。このような場合、形成
されるマークの幅や長さは、新たに記録する前の状態が
結晶であったか、非晶質であったかによって影響され、
オーバライトによってジッタが大きく増加してしまう。
従って、相変化光ディスクにおいてジッタを低減し、マ
ークエッジ記録を実現するには、非晶質状態と結晶状態
の感度を等しくする必要がある。結晶状態の方が熱伝導
率が高いこと、融解にともなう潜熱が大きいことを考慮
すると、ＡｃがＡａより大きくなるように設計するのが
望ましい。このような媒体を提供する手段として、特開
平１−１４９２３８号公報に記載されている透過性の極
薄金属膜を反射膜として用いた吸収率制御方法や、特開
平２−２１８３３４号公報に記載されているＳｉのよう
な高屈折率材料を反射膜として用いた吸収率制御法が有
効であることが知られている。これらの方法では、非晶
質状態と結晶状態の透過率を大きく変化させることが重
要となる。
【０００４】また、Ａｌ等の金属反射膜を用いた吸収率
制御法として特開平６−４９０３号公報が知られてい
る。
【０００５】
【発明が解決しようとする課題】現在、製品化されてい
る光ディスクの光ヘッド光源には、波長７８０−８３０
nmのレーザダイオードが用いられている。さらに記録密
度を向上させるために、レーザダイオードの短波長化が
計られており、波長６９０nm前後の高パワ赤色レーザダ
イオードが実用化に供されつつある。相変化光ディスク
に用いられている記録層の相変化による光学定数の変
化、すなわち、非晶質状態と結晶状態の光学定数の差
は、波長が短くなるにつれ小さくなってしまう。そのた
め、透過光を利用して吸収率制御を行う従来構成の媒体
では、Ａｃを非晶質状態の吸収率Ａａより高くしようと
すると、両状態の反射率差が小さくなりＣ／Ｎが低下す
るという問題があった。この問題は、Ａｃ／Ａａをでき
るだけ大きくしなければならない高線速下では特に深刻
となるため、上記した発明（特開平１−１４９２３８，
２−２１８３３４，６−４９０３号公報）をそのまま適
用しても、良好なオーバライト特性を得ることは困難で
ある。例えばＧｅ2 Ｓｂ2 Ｔｅ5 では、波長８３０nmに
おける光学定数（ｎ，ｋ）は、非晶質では（４．６，
１．０６）、結晶では（５．８９，３．４７）である。
これに対し、波長６９０nmでは、非晶質では（４．３
６，１．７２）、結晶では（４．４６，４．０）であ
り、ｎの変化が小さくなる。そのため、図３に示すよう
に、波長６９０nmにおいては、結晶と非晶質の反射率差
を１５％程度取ろうとするとＡｃ／Ａａは最大でも１．
１程度にしかならない。そのため大きい値のＡｃ／Ａａ
が必要になる高線速ではオーバライトによってジッタが
増加してしまう。まだ実用化には至っていないが、一層
の高密度化が可能な波長５３２nmにおいては、非晶質で
は（３．５３，１．９８）、結晶では（２．３９，３．
８６）とさらに光学定数の変化が小さくなるため、Ｃ／
Ｎを確保しながら吸収率制御をすることがより困難とな
る。
【０００６】本発明は、マークエッジ記録を用いた相変
化光ディスクにおいて、特に、短波長光源を用いた高線
速下でのマークエッジ記録において良好なオーバライト
特性を得ることができる相変化光ディスクを提供するこ
とを目的とする。
【０００７】
【課題を解決するための手段】本発明は極薄金属膜ある
いは高屈折率の透過性反射層の上に屈折率が１．５より
大きい第３誘電体層を積層することを特徴とする光学情
報記録媒体である。
【０００８】本発明によれば、非晶質と結晶の反射率変
化を大きくしたまま、Ａｃ／Ａａを大きくすることが可
能となるので、高線速下でも消去率が高く、かつオーバ
ライトによるジッタ増加の小さな光学情報媒体を提供す
ることが可能となる。また、ディスクの内周部と外周部
で第３誘電体層の膜厚を変化させることにより、Ａｃ／
Ａａの値をディスクの内周部と外周部で変化させること
ができるので、回転数一定の条件でオーバライトするこ
とも可能となる。
【０００９】
【作用】図１にＳｉを反射層とし第３誘電体層を積層し
た相変化光ディスクの６９０nmにおける光学特性の１例
を示す。図１から分かるように、第３誘電体層の膜厚を
変化させることによりＡｃ／Ａａの値を変化させること
ができる。ただし、このような効果が得られるのは、反
射層５として透過性の極薄金属膜や、高屈折率の透過性
材料を用いた場合に限られ、特開平６−４９０３号公報
に記述されているようなＡｌ系金属反射層を用いた場合
には透過光がほとんどないので、第３誘電体層を付加し
ても光学的特性は変化しない。
【００１０】一般に、光ディスク表面には傷を防ぐため
に紫外線硬化樹脂層がつけられる。この樹脂層の屈折率
は１．５程度であるので、第３誘電体層を積層した光学
的な効果を出すためには、第３誘電体層の屈折率は１．
５より大きくなければならない。屈折率ｎが１．５より
大きい材料としてＺｎＳ−ＳｉＯ2 （ｎ＝２．１）、Ａ
ｌ2 Ｏ3 （ｎ＝１．７）、ＡｌＮ（ｎ＝２．０）、Ｔｉ
Ｏ2 （ｎ＝２．８）が使用できる。
【００１１】図１に示すように第３誘電体層の膜厚Ｄを
λ／４ｎ近傍（λは光の波長）に設定することにより、
Ａｃ／Ａａを１．３程度の大きな値にすることが可能と
なる。画像データを扱う場合のように、線速一定の高線
速下でディスクを使用する場合には、第３誘電体層の膜
厚Ｄをλ／６ｎ＜Ｄ＜λ／３ｎの範囲にすることにより
良好なオーバライト特性を得ることが可能となる。
【００１２】最適なＡｃ／Ａａの値は線速に応じて変化
するので、文書データを扱う場合のように回転数一定の
条件でディスクを使用する場合には、ディスクの内周部
と外周部では最適なＡｃ／Ａａの値が異なる。図１から
分かるように、第３誘電体層の膜厚によってＡｃ／Ａａ
の値を変化させることができるので、ディスクの内周部
と外周部で第３誘電体層の膜厚を変化させることによ
り、回転数一定の条件でディスクを使用することが可能
となる。大きいＡｃ／Ａａが必要となる外周では第３誘
電体層の膜厚Ｄｏをλ／６ｎ＜Ｄｏ＜λ／３ｎの範囲に
設定し、Ａｃ／Ａａが比較的小さくてよい内周では、第
３誘電体層の膜厚Ｄｉをλ／６ｎ＞Ｄｉあるいはλ／３
ｎ＜Ｄｉに設定すればよい。
【００１３】
【実施例】以下、本発明の実施例について添付図面に基
づいて説明する。
【００１４】図２は本発明に係る光学情報記録媒体の断
面を示す図である。基板１上に第１誘電体層２、記録層
３、第２誘電体層４、反射層５、第３誘電体層６、紫外
線硬化樹脂層７を順次積層した構成である。
【００１５】（実施例１）基板１としてポリカーボネー
ト（ＰＣ）を用い、第１誘電体層２としてＺｎＳ−Ｓｉ
Ｏ2 を２５０nm、記録層３としてＧｅ2 Ｓｂ2 Ｔｅ5 を
１５nm、第２誘電体層４としてＺｎＳ−ＳｉＯ2 を１８
nm、反射層５としてＳｉを６０nm、第３誘電体層として
ＺｎＳ−ＳｉＯ2 を１００nmを順次スパッタリングによ
り積層した。この構成では、Ａｃ／Ａａは１．２２であ
った。
【００１６】上記ディスクを線速２０ｍ／ｓで回転さ
せ、波長６９０nmの半導体レーザを用いて記録・消去を
行った。３．７６ＭＨｚ，ｄｕｔｙ＝５０％の信号に
６．００ＭＨｚ，ｄｕｔｙ＝５０％の信号をオーバライ
トして、Ｃ／Ｎ、消去率、ジッタを測定した。図５に示
すように、Ｃ／Ｎは５７ｄＢと高く、また、オーバライ
ト後でもジッタは１．２ｎｓと良好な値を示した。
【００１７】（比較例１）実施例１とほぼ同様の構成
で、第３誘電体層を積層していない４層構成のディスク
を用いて、波長６９０nmにおけるオーバライト特性を測
定した。この構成では、Ａｃ／Ａａは１．０７であっ
た。
【００１８】上記ディスクのオーバライト特性を実施例
１と同じ条件で測定したところ、Ｃ／Ｎは５７ｄＢと高
いもののジッタは２．３ｎｓであり、初記録時のジッタ
１ｎｓに比べて大きく増加することが確認された。
【００１９】（実施例２）基板１としてポリカーボネー
ト（ＰＣ）を用い、第１誘電体層２としてＺｎＳ−Ｓｉ
Ｏ2 を２４０nm、記録層３としてＧｅ2 Ｓｂ2 Ｔｅ5 を
１５nm、第２誘電体層４としてＺｎＳ−ＳｉＯ2 を１８
nm、反射層５としてＳｉを６０nm、第３誘電体層として
ＴｉＯ2 ，ＡｌＮをそれぞれ用いたディスクの特性を測
定した。ＴｉＯ2 の膜厚は３０nm，４０nm，６０nm，８
０nm，９０nm、ＡｌＮの膜厚は５０nm，６０nm，９０n
m，１１０nm，１３０nmとし、ＴｉＯ2 の膜厚とオーバ
ライト特性の関係及びＡｌＮの膜厚とオーバライト特性
の関係を調べた。
【００２０】上記ディスクを線速一定の条件（２５ｍ／
ｓ）で回転させ、波長６９０nmの半導体レーザを用いて
記録・消去を行った。３．７６ＭＨｚ，ｄｕｔｙ＝５０
％の信号に６．００ＭＨｚ，ｄｕｔｙ＝５０％の信号を
オーバライトして、ジッタを測定した。図６に示すよう
に、第３誘電体層がＴｉＯ2 の場合には、膜厚が４０nm
〜８０nmにおいてオーバライトによるジッタの増加が小
さかった。また、第３誘電体層がＡｌＮの場合には膜厚
が６０nm〜１１０nmにおいてジッタの増加が小さかっ
た。これらの誘電体層の膜厚の範囲はλ／６ｎ〜λ／３
ｎに相当する。
【００２１】（実施例３）反射層として１０nmのＡｕ
を、第１誘電体層及び第２誘電体層としてＺｎＳ−Ｓｉ
Ｏ2 を、第３誘電体層としてＡｌＮを用いたディスクを
作成した。このディスクではＡｃ／Ａａは１．２であっ
た。このディスクのオーバライト特性を実施例１と同じ
条件で測定したところ、５６ｄＢのＣ／Ｎが得られ、ジ
ッタも１．３ｎｓと良好な値であった。
【００２２】（実施例４）基板として直径２００mmのガ
ラス基板を用い、第１誘電体層としてＺｎＳ−ＳｉＯ2
を２４０nm、記録層としてＧｅ2 Ｓｂ2 Ｔｅ5 を１３n
m、第２誘電体層としてＺｎＳ−ＳｉＯ2 を１８nm、反
射層としてＳｉを６０nmとし、第３誘電体層のＺｎＳ−
ＳｉＯ2 の膜厚をディスクの内周部（半径３０mm）で１
４０nm、外周部（半径９０mm）で９０nmとしたディスク
を作成した。この構成では、Ａｃ／Ａａはディスクの内
周部では１．１、ディスクの外周部では１．３３であっ
た。
【００２３】上記ディスクを３０００ｒ．ｐ．ｍ．で回
転させ、ディスクの内周部と外周部でオーバライト時の
Ｃ／Ｎ、ジッタを測定した。線速約１０ｍ／ｓの内周部
では、１．８８ＭＨｚに３ＭＨｚの信号をオーバライト
した際のＣ／Ｎは５５ｄＢ、ジッタは２ｎｓと良好な値
であった。さらに、線速約３０ｍ／ｓの外周部でも、
５．６４ＭＨｚに９ＭＨｚの信号をオーバライトした際
のＣ／Ｎは５８ｄＢ、ジッタは０．８ｎｓと良好な値で
あることが確認された。
【００２４】
【発明の効果】以上説明したように、本発明により、短
波長光源を用いた高線速下でのマークエッジ記録におい
て良好なオーバライト特性を得ることができる相変化光
ディスクを提供することが可能となる。
【図面の簡単な説明】
【図１】本発明にかかる光学情報記録媒体の光学設計の
１例を示す図である。
【図２】本発明にかかる相変化光ディスクの媒体構成の
１例の断面を示す図である。
【図３】従来の光学情報記録媒体の光学設計の１例を示
す図である。
【図４】従来の相変化光ディスクの媒体構成の１例の断
面を示す図である。
【図５】本発明の１実施例におけるオーバライト特性を
示す図である。
【図６】本発明の１実施例において、第３誘電体層の膜
厚とジッタの相関を示す図である。
【符号の説明】
１ 基板 ２ 第１誘電体層 ３ 記録層 ４ 第２誘電体層 ５ 反射層 ６ 第３誘電体層 ７ 紫外線硬化樹脂層
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ４１Ｍ 5/26

Claims (3)

    【特許請求の範囲】
  1. 【請求項１】マークエッジ記録を利用し、情報の記録・
    消去・再生を行う相変化光ディスクにおいて、基板上に
    第１誘電体層、記録層、第２誘電体層、反射層、第３誘
    電体層、紫外線硬化樹脂層を順に積層した構成であっ
    て、結晶の吸収率Ａｃと非晶質の吸収率Ａａの関係がＡ
    ｃ＞Ａａを満たし、反射層として透過性の極薄金属膜あ
    るいはＳｉ、Ｇｅを用い、第３誘電体層として屈折率ｎ
    が１．５より大きい誘電体を用いることを特徴とする光
    学情報記録媒体。
  2. 【請求項２】情報の記録再生に用いる光の波長をλと
    し、第３誘電体層の膜厚Ｄがλ／６ｎ＜Ｄ＜λ／３ｎな
    る関係を満たすことを特徴とする請求項１記載の光学情
    報記録媒体。
  3. 【請求項３】ディスクの内周部の第３誘電体層の膜厚を
    Ｄｉ、ディスクの外周部の第３誘電体層の膜厚Ｄｏがそ
    れぞれ、λ／６ｎ＜Ｄｏ＜λ／３ｎ、λ／６ｎ＞Ｄｉあ
    るいはλ／３ｎ＜Ｄｉなる関係を満たすことを特徴とす
    る請求項１記載の光学情報記録媒体。
JP6253326A 1994-10-19 1994-10-19 光学情報記録媒体 Expired - Fee Related JP2806274B2 (ja)

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JP6253326A JP2806274B2 (ja) 1994-10-19 1994-10-19 光学情報記録媒体
NL1001442A NL1001442C2 (nl) 1994-10-19 1995-10-18 Opneemmedium voor optische informatie.
KR1019950036812A KR100212369B1 (ko) 1994-10-19 1995-10-18 광학 정보 기록 매체
US08/762,307 US5719006A (en) 1994-10-19 1996-12-09 Optical information recording medium
US08/959,032 US5900347A (en) 1994-10-19 1997-10-28 Optical information recording medium
US09/234,500 US6140011A (en) 1994-10-19 1999-01-21 Optical information recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6253326A JP2806274B2 (ja) 1994-10-19 1994-10-19 光学情報記録媒体

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JP2806274B2 JP2806274B2 (ja) 1998-09-30

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EP0862171A2 (en) * 1997-02-27 1998-09-02 Nec Corporation Optical information recording apparatus, optical recording medium, and method for judging tracking polarity of optical recording medium
US5862122A (en) * 1996-05-27 1999-01-19 Nec Corporation Phase change optical disk and a method for recording and playbacking optical information on or from an optical disk
WO1999044199A1 (fr) * 1998-02-24 1999-09-02 Sony Corporation Support d'enregistrement optique
US5978349A (en) * 1997-08-21 1999-11-02 Tdk Corporation Optical recording medium
US6030679A (en) * 1997-08-20 2000-02-29 Tdk Corporation Optical recording material and its fabrication method
US6040030A (en) * 1997-09-19 2000-03-21 Tdk Corporation Optical recording medium
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US5900347A (en) 1999-05-04
US5719006A (en) 1998-02-17
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NL1001442C2 (nl) 1998-10-20
KR100212369B1 (ko) 1999-08-02
JP2806274B2 (ja) 1998-09-30

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