JPH0442737B2 - - Google Patents

Info

Publication number
JPH0442737B2
JPH0442737B2 JP58018929A JP1892983A JPH0442737B2 JP H0442737 B2 JPH0442737 B2 JP H0442737B2 JP 58018929 A JP58018929 A JP 58018929A JP 1892983 A JP1892983 A JP 1892983A JP H0442737 B2 JPH0442737 B2 JP H0442737B2
Authority
JP
Japan
Prior art keywords
film
refractive index
recording medium
optical recording
antireflection
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.)
Expired - Lifetime
Application number
JP58018929A
Other languages
English (en)
Other versions
JPS59146461A (ja
Inventor
Mitsuharu Sawamura
Susumu Ito
Masaaki Matsushima
Hiroyoshi Kishi
Eizo Sasamori
Satoshi Yoshihara
Katsuhiko Takano
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP58018929A priority Critical patent/JPS59146461A/ja
Publication of JPS59146461A publication Critical patent/JPS59146461A/ja
Publication of JPH0442737B2 publication Critical patent/JPH0442737B2/ja
Granted legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/257Record 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
    • G11B7/2578Record 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/257Record 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
    • G11B2007/25705Record 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
    • G11B2007/25706Record 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 transition metal elements (Zn, Fe, Co, Ni, Pt)
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/257Record 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
    • G11B2007/25705Record 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
    • G11B2007/25708Record 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 13 elements (B, Al, Ga)
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/257Record 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
    • G11B2007/25705Record 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
    • G11B2007/25715Record 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/257Record 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
    • G11B2007/25705Record 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
    • G11B2007/25718Record 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 halides (F, Cl, Br, l)
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/253Record 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
    • G11B7/2531Record 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/256Record 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 improving adhesion between layers

Landscapes

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

Description

【発明の詳細な説明】 本発明は、光ビームを用いて光学的に情報を記
録又は再生することが可能な光学的記録媒体に関
するものである。
従来、光学的記録媒体の構成として、ガラス基
板上の複数層から成る反射防止膜を形成し、更に
その上に記録層を設けた例が知られている。しか
しながら、基板としてプラスチツク等を用いた場
合、或いはガラス基板と反射防止膜との間に樹脂
から成る断熱層等を設けた場合には、クラツクを
生じる為に複数層の反射防止を形成することがで
きず、もつぱら単層の反射防止膜が用いられ、十
分な反射防止効果が得られない欠点があつた。
本発明は、樹脂基板又は基板と反射防止膜の間
に樹脂層を用いる場合に上記欠点を除去し、効率
の高い記録、再生が可能な光学的記録媒体を提供
することを目的とする。
本発明は樹脂基板上に内部応力が相反する膜の
複数層から構成される反射防止膜および記録層が
順次設けられて成る光学的記録媒体および基板上
に樹脂層、内部応力が相反する膜の複数層から構
成される反射防止膜および記録層が順次設けられ
て成る光学的記録媒体によつて上記目的を達する
ものである。
本発明において基板として用いられる樹脂とし
てはポリ(メタ)アクリレート類、ポリカーボネ
ートなどを挙げることができる。またガラス基板
上に有機断熱層等を形成する樹脂としてはシリコ
ーン系、エポキシ系、ウレタン系、ポリ(メタ)
アクリレート系を挙げることができる。
本発明において、上記反射防止膜は、例えば次
のようにして構成される。すなわち、高屈折率膜
として圧縮応力を有するZnS膜を用い、低屈折率
膜として引張り応力を有するMgF2膜またはNa3
AF6膜などを用いて反射防止膜を構成する。
これらの各膜は2層以上用いることも、もちろん
可能である。別の例では、低屈折率膜として圧縮
応力を有するSiO2膜を用い、高屈折率膜として
引張り応力を有するTiO2膜またはZrO2膜などを
用いて反射防止膜を構成することもできる。さら
に別の例では、高屈折率膜としてPbF2(圧縮応
力)膜を用い、低屈折率膜としてCaF2(引張り応
力)を用いる。
本発明の光学的記録媒体において、反射防止膜
の基板側から第1層目にSiO膜を設けることもで
きる。
SiO膜は、有機樹脂に対して、密着性、耐溶剤
性、表面強度においてすぐれ反射防止膜の成膜性
(クラツク、ハガレ等に関係)をより向上させる。
本発明の光学的記録媒体の構成を示す模式図で
ある第1図を参照して本発明の一実施態様を説明
する。ガラス基板1a上に有機樹脂からなる断熱
層2を形成し、反射防止層として圧縮応力を有す
る膜3a、引張り応力を有する膜3bおよび圧縮
応力を有する膜3cを真空蒸着法により形成し、
さらに記録層4、保護膜5を設け、接着層6を介
してガラス基板1bと貼り合せて光学的記録媒体
とする。反射防止膜は、反射防止層3aおよび3
cを高屈折率膜、3bを低屈折率膜として形成さ
れる。また、3aおよび3cを引張り応力を有す
る膜を用い、3bを圧縮応力を有する膜にして反
射防止膜を形成することもできる。
本発明においては、反射防止膜を内部応力が相
反する膜の複数層により構成することによつて、
樹脂基板または基板上の樹脂層を下地として反射
防止膜を形成する場合の膜のクラツクが防止され
る。また、基板上に塗布された樹脂を下地とする
場合、反射防止膜自体の内部応力が小さくなるよ
うに形成されるので、樹脂の密着性、分光透過率
特性、表面硬度、断熱性などの他に、成膜作業性
をも重視して樹脂層を選択することができ、選択
の自由度が増すという利点がある。
以下に実施例を示して本発明を具体的に説明す
る。
実施例 1 第1図に示した構造の光学的記録媒体を、反射
防止層3aおよび3cにZnS膜を高屈折率膜とし
て用い、MgF2膜を低屈折率膜として用いて製作
した(記録波長800nmの1/4λ膜厚)。なお、断熱
層2、記録層4および保護膜5としては、それぞ
れポリアクリレート系樹脂GdTbFeCo4元系非晶
質合金膜およびSiO膜を用いた。このようにして
得られた光学的記録媒体は、反射防止膜にクラツ
クを生じなかつた。
比較のために、反射防止層3aおよび3cに
は、高屈折率膜としてZrO2膜を用い、3bには
低屈折率膜としてMgF2膜を用いて反射防止膜を
構成した場合、記録波長800nmの1/4λ膜厚にお
いては膜全面にクラツクが生じた。なお、有機断
熱層2がなく、反射防止膜を直接ガラス基体1a
上に上記のようにZrO2膜とMgF2膜とで形成した
場合にはクラツクが生じなかつた。
この結果から、内部応力が相反するZnS膜と
MgF2膜との組み合せの場合には反射防止膜にク
ラツクを生じないのに対して、ZrO2膜とMgF2
との組み合せでは、両者とも引張り応力を有する
ため、クラツクが生じるものと考えられる。
実施例 2 実施例1と同様にして、反射防止層3aおよび
3cに引張り応力を有する高屈折率のTiO2膜を
用い、3bに圧縮応力を有する低屈折率のSiO2
膜を用いて光学的記録媒体を作製した。反射防止
膜にクラツクは生じなかつた。
比較のために、反射防止層3aおよび3cとし
てTiO2膜を用い、3bとしてMgF2膜を用い反射
防止層を構成したところ、膜全面にクラツクを生
じた。これはTiO2膜およびMgF2膜が、ともに引
張り応力を有しているためと考えられる。
前述の実施例ではガラス基板上に樹脂から成る
断熱層を設け、その上に反射防止膜を形成する例
を示したが、本発明は同様に樹脂基板上に直接反
射防止膜を形成する場合にも有効である。又、前
記例では記録層としてGdTbFeCo等の非晶質合
金を用いた光学的記録媒体を示したが、本発明は
これに限らず、TeOx,TeC等のカルコゲン系、
VO2等の半導体材料他、光学的に記録又は再生が
可能なものであればどのような材料でも記録層と
して用いることができる。
【図面の簡単な説明】
第1図は本発明の光学的記録媒体の構造を説明
するための模式図である。 1a,1b……ガラス基板、2……有機断熱
層、3a,3b,3c……反射防止層、4……記
録磁性層、5……保護膜、6……接着層。

Claims (1)

  1. 【特許請求の範囲】 1 樹脂基板上に内部応力が相反する膜の複数層
    から構成される反射防止膜および記録層が順次設
    けられて成る光学的記録媒体。 2 前記反射防止膜が、高屈折率膜として圧縮応
    力を有するZnS膜を用い、低屈折率膜として引張
    り応力を有するMgF2膜またはNa3AF6膜を用
    いて構成された特許請求の範囲第1項記載の光学
    的記録媒体。 3 前記反射防止膜が、低屈折率膜として圧縮応
    力を有するSiO2膜を用い、高屈折率膜として引
    張り応力を有するTiO2膜またはZrO2膜を用いて
    構成された特許請求の範囲第1項記載の光学的記
    録媒体。 4 前記反射防止膜が、該基板側から第1番目の
    層としてSiO膜を用いて構成された特許請求の範
    囲第1項記載の光学的記録媒体。 5 基板上に樹脂層、内部応力が相反する膜の複
    数層から構成される反射防止膜および記録層が順
    次設けられて成る光学的記録媒体。 6 前記反射防止膜が、高屈折率膜として圧縮応
    力を有するZnS膜を用い、低屈折率膜として引張
    り応力を有するMgF2膜またはNa3AF6膜を用
    いて構成された特許請求の範囲第5項記載の光学
    的記録媒体。 7 前記反射防止膜が、低屈折率膜として圧縮応
    力を有するSiO2膜を用い、高屈折率膜として引
    張り応力を有するTiO2膜またはZrO2膜を用いて
    構成された特許請求の範囲第5項記載の光学的記
    録媒体。 8 前記反射防止膜が、該基板側から第1番目の
    層としてSiO膜を用いて構成された特許請求の範
    囲第5項記載の光学的記録媒体。
JP58018929A 1983-02-09 1983-02-09 光学的記録媒体 Granted JPS59146461A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58018929A JPS59146461A (ja) 1983-02-09 1983-02-09 光学的記録媒体

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58018929A JPS59146461A (ja) 1983-02-09 1983-02-09 光学的記録媒体

Publications (2)

Publication Number Publication Date
JPS59146461A JPS59146461A (ja) 1984-08-22
JPH0442737B2 true JPH0442737B2 (ja) 1992-07-14

Family

ID=11985320

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58018929A Granted JPS59146461A (ja) 1983-02-09 1983-02-09 光学的記録媒体

Country Status (1)

Country Link
JP (1) JPS59146461A (ja)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6129435A (ja) * 1984-07-02 1986-02-10 Olympus Optical Co Ltd 光磁気記録媒体の製造方法
JPH0678032B2 (ja) * 1985-08-06 1994-10-05 三菱化成株式会社 光学的記録媒体
JPH0762917B2 (ja) * 1986-01-20 1995-07-05 ソニー株式会社 光学式記録媒体
JPS62226449A (ja) * 1986-03-27 1987-10-05 Canon Inc 光学的磁気記録媒体
DE69030982T2 (de) * 1989-04-27 1997-11-13 Canon Kk Optisches Aufzeichnungsmedium und Verfahren zu seiner Herstellung
JP2935769B2 (ja) * 1992-04-02 1999-08-16 富士写真光機株式会社 反射防止膜の製造方法

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