JPH0613238B2 - 光学的情報記録媒体 - Google Patents

光学的情報記録媒体

Info

Publication number
JPH0613238B2
JPH0613238B2 JP57194630A JP19463082A JPH0613238B2 JP H0613238 B2 JPH0613238 B2 JP H0613238B2 JP 57194630 A JP57194630 A JP 57194630A JP 19463082 A JP19463082 A JP 19463082A JP H0613238 B2 JPH0613238 B2 JP H0613238B2
Authority
JP
Japan
Prior art keywords
recording medium
information recording
optical information
dye
present
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
JP57194630A
Other languages
English (en)
Other versions
JPS5985791A (ja
Inventor
通治 安倍
秀章 大庭
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP57194630A priority Critical patent/JPH0613238B2/ja
Publication of JPS5985791A publication Critical patent/JPS5985791A/ja
Priority to US06/651,725 priority patent/US4600625A/en
Publication of JPH0613238B2 publication Critical patent/JPH0613238B2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • G11B7/242—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
    • G11B7/244—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
    • 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
    • G11B2007/25706—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 transition metal elements (Zn, Fe, Co, Ni, Pt)
    • 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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    • G11B7/257—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
    • G11B2007/25708—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 13 elements (B, Al, Ga)
    • 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
    • G11B2007/2571—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)
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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
    • G11B2007/25715—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
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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
    • G11B2007/25718—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 halides (F, Cl, Br, l)
    • 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
    • G11B7/256—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 improving adhesion between 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
    • 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
    • G11B7/257—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
    • 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
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    • Y10S430/165—Thermal imaging composition
    • 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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    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
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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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    • Y10T428/24835—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including developable image or soluble portion in coating or impregnation [e.g., safety paper, etc.]
    • 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

  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

Description

【発明の詳細な説明】 技術分野 本発明はシアニン色素を含む薄膜を有する光学的情報記
録媒体に関する。さらに詳しくは、レーザービームによ
り直接記録し反射光の変化によって情報再生を行なう方
法（いわゆる光ディスク）に用いられる光学的情報記録
媒体に関する。
従来技術 従来、色素薄膜を記録層として適用した光学的情報記録
媒体は知られている。（例えば、特開昭56-16948号広
報）。すなわち、この種の光学的メモリ媒体は基板と色
素薄膜記録層との間に金属反射膜を設け、記録層の側か
ら記録層の光吸収率が極大を示す波長のレーザービーム
を集光照射して情報を記録再生するものである。しかし
ながら、かかる光学的情報記録媒体においては色素記録
層の保護が困難であるため記録層に付着した小ゴミなど
によって情報の記録再生に誤りを生じやすいこと及び、
反射型光学的情報記録媒体として利用するためには金属
反射膜が必要であり、媒体の構成が複雑になり、また記
録再生感度が充分でなく、さらに情報記録媒体そのもの
が長期保存に耐えうるものではないという問題がある。
目的 本発明は上記問題に鑑みてなされたものであって、その
目的は反射率、感度（記録再生）及びＳ／Ｎが高くしか
も保存性の高い光学的情報記録媒体を提供することにあ
る。
概要 上記目的を達成するために、本発明者等は近赤外光に吸
収のある多くのシアニン色素を種々検討した結果、記録
再生特性と保存性のすぐれた色素を見出した。
すなわち、本発明によれば、基板上に一般式 （式中、Ｒ1、Ｒ2およびＲ3は同じかまたは異なってい
てもよくそれぞれはＣ1〜Ｃ6アルキルを表わし、Ｘはハ
ロゲン、過ハロゲン酸、四フッ化ホウ素、トルエンスル
ホン酸またはアルキル硫酸を表わし、Ａはベンゼン環ま
たはナフチル環を表わしそしてそれぞれの環上には置換
基としてアルキル、アルコキシ、ヒドロキシ、カルボキ
シル、ハロゲン、アリル、またはアルキルカルボキシル
があってもあるいはなくてもよくそしてｎは２の整数を
表わす）で表わされるシアニン色素を含みかつバインダ
ー及び一重項酸素クエンチャーを含まない厚さ350Å以
上1,000Å未満の薄膜を塗布法により形成したことを特
徴とする、光学的情報記録媒体が提供される。
本発明の光学的情報記録媒体は基本的には基板上に上記
シアニン色素を含む薄膜だけを設けたものであるが、前
記薄膜の上または下には目的に応じて保護層などの他の
層を設けることができる。ここで「シアニン色素を含
む」とは上記一般式で表わされるシアニン色素単独また
はそれと他の色素あるいは化合物との組合せからなるこ
とを意味する。
本発明のシアニン色素は、まず上記一般式によって表わ
されるように２個のピロール環にそれぞれベンゼン環ま
たはナフチル環が縮合した二つの形態のものを包含す
る。特に、本発明のシアニン色素はピロール環の1-位お
よび3-位にＣ1〜Ｃ6アルキル基が存在することを特徴と
している。Ｃ1〜Ｃ6のアルキル基の例としては、メチ
ル、エチル、プロピル、ブチル、ペンチルおよびヘキシ
ルがあり、メチルまたはエチルが特に好ましい。また、
ベンゼン環またはナフチル環上には置換基が存在してい
てもあるいは存在していなくてもよく、そして置換基の
好ましい例としてはCH3、C2H5、Cl、Br、CH3O、OH、-CH2COOH、
-CH2CH＝CH2などをあげることができる。
また、本発明のシアニン色素は２個のピロール環がペン
タメチン鎖(n＝2)によって結合されていることを特徴と
もしている。ｎが０、１あるいは３のものは反射率、記
録再生及び保存性の全ての条件を満たすことができず、
特に波長800nm付近での反射率が劣るので好ましくな
い。
本発明で用いるシアニン色素においてイオン結合を形成
するアニオン（Ｘ ）の例としては、Ｃｌ 、Ｂｒ 、
Ｉ 、ＣｌＯ４ 、ＢＦ４ 、Ｃ２Ｈ５ＳＯ４ 、ＣＨ
３・Ｃ６Ｈ４ＳＯ３ などを挙げることができる。
以下に、本発明で好ましく用いられるシアニン色素を例
示する。
1-メチル-2-〔7-(1-メチル-3,3-ジメチル-2-インドリニ
リデン)-1,3-ペンタジェニル〕-3,3-ジメチル−インド
リウムヨーダイド、 1-エチル-2-〔7-(1-エチル-3,3-ジメチル-2-インドリニ
リデン)-1,3-ペンタジェニル〕-3,3-ジメチル−インド
リウムパークロレート、 1-メチル-2-〔7-(1-メチル-3,3-ジメチル-2-ベンゾ
〔ｅ〕インドリニリデエン)-1,3-ペンタジェニル〕-3,3
-ジメチル−ベンゾ〔ｅ〕インドリウムパークロレー
ト、 本発明において使用される基板材料は当業者には既知の
ものであり、使用レーザ光に対して透明または不透明の
いずれでもよい。ただし、基板側からレーザ光で書込み
記録を行なう場合は、書込みレーザ光に対して透明でな
ければならない。一方、基板と反対側すなわち記録層の
表面から書込み記録を行なう場合は、書込みレーザ光に
対して透明である必要はない。しかしながら、読み出し
再生を透過光で行なう場合は読みだしレーザ光に対して
透明でなければならない。読み出し再生を反射光で行な
う場合は読み出しレーザ光に対して透明または不透明の
いずれでもよい。基板材料の材質としては、ガラス、石
英、セラミック、プラスチックス、紙、板状または箔状
の金属などの一般に使用されている記録材料の支持体で
よい。特に、プラスチックスが安全性、記録感度向上、
平面性、軽量、加工性などの点から好適である。代表的
なプラスチックスとしては塩化ビニル樹脂、酢酸ビニル
樹脂、アクリル樹脂、メタクリル樹脂、ポリエステル樹
脂、ニトロセルロース、ポリエチレン樹脂、ポリプロピ
レン樹脂、ポリアミド樹脂、ポリスチレン樹脂、ポリカ
ーボネート樹脂、エポキシ樹脂などが挙げられる。
また、基板には必要に応じ凹凸で形成される案内溝を設
けてよいしまた例えば紫外線硬化樹脂などからなる下引
き層を設けてもよい。
本発明におけるシアニン色素薄膜の形成は、塗布法を用
いて行なうことが必要である。
すなわち、塗布法は真空蒸着法に比べその作業工程が簡
便であり、また真空蒸着法のように高温高圧下という過
酷な条件を採用しないため、高温高圧下で分解・解離し
やすい前記一般式(I)で示される色素を記録層に効率的
に含有させることが可能となる。
塗布法に用いる有機溶媒としては例えばメタノール、メ
チレンジクロライド、1,2-ジクロロエタンなどを使用で
きる。塗布はスプレー、ローラーコーティング、ディッ
ピングおよびスピンニングなどの慣用のコーティング法
によって行なわれる。
さらに、本発明の光学的情報記録媒体の要件として、色
素を含む膜の厚さが重要な因子であり、即ち、良好な記
録再生特性を得るには、その厚さを350Å以上1000Å未
満とすることが必要である。厚さが1000Åより大きくな
ると、レーザー光を該膜に照射して情報を記録しようと
しても該膜が穴形成などの物理的変化をおこしにくくな
るので記録が困難となり、たとえレーザ光のパワーをあ
げて物理的変化を起こさせたとしても、照射により除去
された膜部分の色素が多量に飛散し、情報を再生する際
に再生情報のエラー率を高める結果になる。
一方、上記の色素含有膜は、記録された情報を再生する
ためには、好ましくは40%以上の反射率を有することが
必要であり、このような反射率は膜が薄すぎると得られ
ないので、厚さを約350Å以上にすることが必要であ
る。
次に図面を参照して本発明の光学的情報記録媒体の構成
と記録再生方法について説明する。
第１図に示すように、光学的情報記録媒体１は基本的に
は基板２上に前記シアニン色素を含む薄膜３を設けたも
のである。記録と再生には、レーザビーム４を集光レン
ズ５によって色素膜３上に１〜２μｍの大きさに集光す
ることによって行なわれる。記録再生ビームは色素膜３
の側から照射してもよいが、基板が透明の場合は基板２
の側から照射する方がゴミの影響を受けにくいという利
点がある。情報の記録は、レーザ光の熱作用による色素
膜へのピット形成によって行なわれ、情報の再生は、ピ
ット形成部と非ピット形成部からの反射光の差を検出す
ることによって行なわれる。また、別の態様として図示
していないが、同一構成の２枚の記録媒体１を色素薄膜
3,3同士を対向して配置することも可能であり、こうし
た場合には色素薄膜３は外気と遮断され、ゴミの付着、
キズの発生、有害ガスとの接触から保護できるため保存
性は著しく向上する。この際、色素薄膜３は基板２によ
って保護されるので記録情報が物理的化学的作用によっ
て損なわれることがない。
本発明の情報記録媒体に適用されるレーザ光は使用色素
の吸収波長に応じて選択する必要があるが比較的安価な
He-Neレーザまたは半導体レーザが好ましい。
実施例 以下に比較例と共に実施例を掲げて本発明をさらに説明
するが、これに限定されるものではない。
情報記録媒体は以下の表に構造式で示したシアニン色素
を所定の溶媒に溶解しこの溶液を回転塗布機によって所
定の基板（アクリル樹脂：三菱レイヨンアクリライト)
(厚さ１mm)上に所定の厚さで塗布し乾燥することによっ
て作製した。このようにして作製した情報記録媒体の耐
光寿命は戸外の1/100の照射光を受ける場所に保存され
たときの値で示してあり、光学濃度が初期値の50%まで
低下するに要した年数であらわした。耐光テストには54
000ルックスのタングステン光を35±３℃の条件で照射
する促進試験方法を用いた。それらの結果を以下の表１
にまとめて示す。
次に、実施例１で使用したシアニン色素を代表例とし
て、本発明の記録媒体における色素薄膜の膜厚と反射特
性及びC/Nを測定した。その結果、膜厚350Å以上におい
ては、反射率40%以上が得られ、反射型の光学的情報記
録媒体として満足すべき光学特性を示していることが明
らかとなった。
比較例１及び比較例２のように本発明と同様なシアニン
色素を用いてもバインダーを含むものは反射率が各々13
%及び14%程度であって、反射型の光学的情報記録媒体と
しては不充分であった。
また、比較例３、及び比較例４のように本発明とは異な
るシアニン色素を用いたものは反射率が各々19%及び34%
であったが、耐光寿命が1.5年及び0.8年であって、保存
性に劣ることが判った。
また、参考例１及び参考例２のように、前記一般式にお
いてｎが３の色素を用いたものは反射率が各々19%、32%
程度であって、本発明品(n＝2)に比べて反射特性がやや
低下することが判った。
次に波長790nmの半導体レーザビームを1.54μｍにしぼ
って記録周波数0.6875MHzでピット間隔1.8μｍ（ピット
長0.9μｍ）で記録して再生し、再生信号をスキャンニ
ングフィルタのバンド幅30KHzでスペクトル解析した
（タケダ理研製トラッキングスコープTR4110使用）デー
タを示す。記録レーザパワー4mWにおいては、膜厚350〜
1000Åの範囲でC/N47dB以上が得られ、膜厚450〜750Å
においてはC/N50dBが得られた。
効果 本発明の色素膜からなる光学的情報記録媒体は粒状性の
全くない均一な膜が得られるため反射率が高く、またC/
Nが高く、また保存性がよいため実用性にすぐれ、また
塗布により記録膜を形成できるので製造性がよいという
利点を有する。
【図面の簡単な説明】
第１図は本発明の光学的情報記録媒体の基本構成と記録
再生法を示す模式図である。 １…情報記録媒体、２…基板、３…色素薄膜、４…レー
ザビーム、５…集光レンズ。
フロントページの続き (56)参考文献 特開 昭58−194595（ＪＰ，Ａ) 特開 昭56−16948（ＪＰ，Ａ) 特開 昭57−74845（ＪＰ，Ａ) 特開 昭56−25243（ＪＰ，Ａ) 特開 昭59−55795（ＪＰ，Ａ) 特開 昭59−55794（ＪＰ，Ａ) 特開 昭59−83695（ＪＰ，Ａ) 「Ａｐｐｌｉｅｄ Ｐｈｙｓｉｃｓ Ｌ ｅｔｔｅｒｓ」Ｖｏｌ．39．1981 Ｐ. 718〜720 「第27回，応用物理学関係連合講演会 講演予稿集」198年 Ｐ．49

Claims (1)

    【特許請求の範囲】
  1. 【請求項１】基板上に一般式 （式中、Ｒ1、Ｒ2およびＲ3は同じかまたは異なってい
    てもよくそれぞれはＣ1〜Ｃ6アルキルを表わし、Ｘはハ
    ロゲン、過ハロゲン酸、四フッ化ホウ素、トルエンスル
    ホン酸またはアルキル硫酸を表わし、Ａはベンゼン環ま
    たはナフチル環を表わし、そしてそれぞれの環上には置
    換基としてアルキル、アルコキシ、ヒドロキシ、カルボ
    キシル、ハロゲン、アリル、またはアルキルカルボキシ
    ルがあってもあるいはなくてもよくそしてｎは２の整数
    を表わす）で表わされるシアニン色素を含みかつバイン
    ダー及び一重項酸素クエンチャーを含まない厚さ350Å
    以上1,000Å未満の薄膜を塗布法により形成したことを
    特徴とする、光学的情報記録媒体。
JP57194630A 1982-11-08 1982-11-08 光学的情報記録媒体 Expired - Lifetime JPH0613238B2 (ja)

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JP57194630A JPH0613238B2 (ja) 1982-11-08 1982-11-08 光学的情報記録媒体
US06/651,725 US4600625A (en) 1982-11-08 1984-09-18 Optical information recording medium

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JPH0613238B2 true JPH0613238B2 (ja) 1994-02-23

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