JPH0478576A - 光情報記録媒体 - Google Patents

光情報記録媒体

Info

Publication number
JPH0478576A
JPH0478576A JP2190407A JP19040790A JPH0478576A JP H0478576 A JPH0478576 A JP H0478576A JP 2190407 A JP2190407 A JP 2190407A JP 19040790 A JP19040790 A JP 19040790A JP H0478576 A JPH0478576 A JP H0478576A
Authority
JP
Japan
Prior art keywords
recording
recording medium
wavelength
dyes
layer
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
JP2190407A
Other languages
English (en)
Other versions
JP3026586B2 (ja
Inventor
Michiharu Abe
通治 安倍
Masaaki Umehara
正彬 梅原
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 JP2190407A priority Critical patent/JP3026586B2/ja
Priority to US07/732,038 priority patent/US5196250A/en
Publication of JPH0478576A publication Critical patent/JPH0478576A/ja
Application granted granted Critical
Publication of JP3026586B2 publication Critical patent/JP3026586B2/ja
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

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    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/165—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
    • Y10T428/00—Stock material or miscellaneous articles
    • 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】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、光ディスク、光カードなどのレーザー集光ビ
ームを用いて情報を記録、再生する光情報記録媒体に関
する。
［従来の技術］ 従来、実用的な半導体レーザー用有機記録材料としては
、光波長７５０ｎ−〜ｌ１５０ｎｗのものが知られてい
る。代表的なものはシアニン色素などのポリメチン色素
、フタロシアニン色素、ナフトキノン色素、ナフタロシ
アニン色素、スクワリリウム色素などの薄膜を基板上に
設けたものである。［安倍、光デイスク用有機記録材料
、有機エレクトロニクス材料研究金偏、ぶんしん出版（
１９８９）　］ しかしながら、これらの色素は４００ｎｓ〜５００ｎ１
１の短波長領域においては光吸収性、光反射性を持たず
、高密度記録性に限界があった。
［発明が解決しようとする課題］ 本発明は集光ビームをより細く絞り込み、高密度記録可
能な波長３００ｎｉ〜５００ｎｍのレーザを用いた光ピ
ツクアップに適用できる記録媒体を提供することを目的
とする。集光ビームは波長が短くなる程、細く絞ること
ができるので現状の波長８００ｎｓｌこおける記録密度
の２．５倍〜７倍を達成可能にする。
［課題を解決するための手段］ 本発明者は、前記課題を解決するため鋭意検討した結果
、記録材料として特定のポリエン化合物を採用すること
が有効であることを知見し、本発明に至った。
すなわち、本発明は、基板上に下記一般式で示されるジ
アリールポリエン化合物を含む薄膜を設けた光情報記録
媒体である。
（式中、 Ａ１％　Ａ２　ニアリール基、Ａ１とＡ２は同一でも異
なっていてもよい。
Ｒ１、Ｒ２；水素原子又はハロゲン、アルキル基などの
置換基 ｎ：２以上の整数 を表わす） 上記一般式において、Ａ１、Ａ２のアリールは同一であ
ることが一般的であるが異なっていてもよい。
Ｒ１、Ｒ２は水素原子が一般的であるが、ハロゲン原子
、メチル基、エチル基などのアルキル基などで置換され
ていてもよい。
ｎは２以上の整数であるが、３〜１２が吸収波長からみ
て特に好ましい。
ＡＩ、Ａ２に適用できるアリール基としては、フェニル
基、置換フェニル基、ナフチル基、置換ナフチル基、ア
ントラセニル基、置換アントラセニル基、フェナンスレ
ニル基、置換フェナンスレニル基などが挙げられる。又
、前記の置換基としてはハロゲン原子、メチル基、エチ
ル基などのアルキル基等が挙げられる。次に一例として
ＡＩ−Ａ２、Ｒ＋−Ｒ２−水素原子の場合の吸収極大波
長を表１に示す。
表１　本発明に用いられる色素の最大吸収波長本発明光
情報記録媒体の記録層材料として使用する上記特定構造
を有するポリエン化合物としては、以下に例示するもの
を挙げること力（できる。
各構造式は、一般式を示ル、ｎは表１１こ対応して２〜
１２の整数をあられす。
記録層とから構成されるものであるが、必要に応じて更
に下引層、保護層、反射層などを設けることもできる。
又、記録層同士を内側にして２枚の記録媒体を対向させ
たいわゆるエアーサンドイッチ構造にすることも可能で
ある。
本発明における記録層はレーザ光の照射により何らかの
光学的変化を生じさせその変化により情報を記録できる
ものであって、この記録層中には上記本発明の色素が含
有されている必要がある。又、記録層の形成にあたって
は本発明の色素を１種又は２種以上の組合せで用いても
よい。更に本発明の上記色素は他の染料例えばフタロシ
アニン系染料、テトラヒドロコリン系染料、ジオキサジ
ン系染料、トリフエッチアジン系染料、フェナンスレン
系染料、シアニン（メロシアニン）系染料、ナフトキノ
ン系染料、アントラキノン（インダンスレン）系染料、
キサンチン系染料、本発明の上記色素以外のトリフェニ
ルメタン系染料、クロコニウム系染料、ビリリウム系染
料、アズレン系染料など又は金属、金属化合物例えばＩ
ｎ、Ｓｎ、Ｔｅ５Ｂｉ、Ａｌ５Ｓｅ、ＴｅＯ２，５ｎＯ
２ＡｓＳＣｄなどと混合分散あるいは積層の形態で用い
ることもできる。又、本発明の上記色素は高分子材料例
えばアイオノマー樹脂、ポリアミド系樹脂、ビニル系樹
脂、天然高分子、シリコーン、液状ゴムなどの種々の材
料もしくはシランカップリング剤などの中に混合分散し
て用いてもよいしあるいは特性改良の目的で安定剤（例
えば遷移金属錯体）、分散剤、難燃剤、滑剤、帯電防止
剤、界面活性剤、可塑剤などと一緒に用いることもでき
る。
次に図面について本発明による光情報記録媒体の構成を
説明する。
第１図に示すように、本発明の光情報記録媒体は基本的
には基板ｌ上に本発明の色素を含む記録層２を設けたも
のである。又、記録層は光反射層と光吸収層とを任意の
順序で組合せた２層構成とすることもできる。
記録層の形成は蒸着、スパッタリング、ＣＶＤ又は溶成
塗布などの通常の手段によって行うことができる。塗布
法を用いる場合には本発明の色素などを有機溶媒に溶解
してスプレー　ローラーコーティング、ディッピング及
びスピニングなどの慣用のコーティング法によって行わ
れる。有機溶媒としては一般にはメタノール、エタノー
ル、イソプロパツールなどのアルコール類、アセトン、
メチルエチルケトン、シクロヘキサノンなどのケトン類
、Ｎ、Ｎ−ジメチルホルムアミド、Ｎ、Ｎ−ジメチルア
セトアミドなどのアミド類、ジメチルスルホキシドなど
のスルホキシド類、テトラヒドロフラン、ジオキサン、
エチレングリコールモノメチルエーテルなどのエーテル
類、酢酸メチル、酢酸エチルなどのエステル類、クロロ
ホルム、塩化メチレン、ジクロルエタン、四塩化炭素、
トリクロルエタンなどの脂肪族ハロゲン化炭化水素類あ
るいはベンゼン、トルエン、キシレン、リグロイン、モ
ノクロルベンゼン、ジクロルベンゼンなどの芳香族類な
どを用いるとかできる。記録層の膜厚は１００人〜１０
μ膓、好ましくは２００　人〜１０００人が適当である
。又、記録層は基板側からの反射率が少なくとも１５％
であることが記録再生に望ましい。
基板ｌは基板側から記録再生を行う場合は使用レーザ光
に対して透明でなければならず、又、記録層側から行う
場合は透明である必要はない。
基板としてはガラス、ポリエステル、ポリアミド、ポリ
オレフィン、ポリカーボネート、エポキシ、ポリイミド
、ポリメチルメタクリレートなどのプラスチック、金属
、セラミックスが通常使用されるがその他記録媒体に使
用されるものならどれでもよい。
又、第２図ないし第６図に示すように第１図の構成のも
のに更に下引層３及び／又は保護層４及び／又は反射層
５を設けた構成とすることもできる。この際、下引層及
び／又は保護層中には本発明の上記式で表わされる色素
が含有されていてもよい。
下引層３は（ａ）接着性の向上、（ｂ）水又はガスなど
のバリヤー　　（ｅ）記録層の保存安定性の向上、（ｄ
）反射率の向上、（ｅ）溶剤からの基板の保護及び（ｒ
）プレグルーブの形成などを目的として使用される。（
ａ）の目的に対しては前記高分子材料及びシランカップ
リング剤などの種々の物質を用いることができ、（ｂ）
　、（ｅ）の目的に対しては上記高分子材料以外に無機
化合物例えばＳ　ｉｏ２、ＭｇＦ２、Ｓ　ｉｏ、ＴｉＯ
２、ＺｎＯ，Ｔｉ　Ｎ、Ｓ　ｉ　Ｎなど、金属又は半金
属例えばＺｎ、Ｃｕ％５ＳＮｉＳＣｒ、Ｇｅ、Ｓｅｓ　
Ｃｄｓ　Ａｇｓ　Ａｌなどを用いることができる。（ｄ
）の目的に対しては金属例えばＡＩ、Ａｇなど又は金属
光沢を有する有機薄膜例えばメチン系染料、キサンチン
系染料などを用いることができ、そして　（ｅ）、（ｆ
）の目的に対しては紫外線硬化樹脂、熱硬化性樹脂、熱
可塑性樹脂などを用いることができる。下引層の膜厚は
０゜０１〜３０μ調好ましくは０．０５〜ｌＯμ園が適
当である。又、保護層４はキズ、ホコリ、汚れなどから
の保護及び記録層の化学的安定性の向上を目的として設
けられ、その材料としては下引層と同じ材料を使用する
ことができる。保護層の膜厚は０．１μ厘以上好ましく
は５０μｍ以上が適当である。
更に、本発明による光情報記録媒体の別の構成としては
、第１図ないし第４図に示した同一構成の２枚の記録媒
体（場合によりその１枚を基板のみとして）を用い記録
層２を内側に配置して密封したいわゆるエアーサンドイ
ッチ構造にしてもよいし、保護層４を介して接着したい
わゆる密着サンドイッチ構造（貼り合せ構造）にしても
よい。
情報の記録はレーザ光をレンズにより集光し記録層上に
微細な穴（ビット）を形成することによりなされ、読出
しは微弱なレーザ光を照射しビット部とそれ以外の部分
の反射率の差を利用して行うことができる。
なお、レーザ光源として波長７５０〜８５０ｎｍの半導
体レーザの二次高調波を用いると装置の小型化が可能と
なる。
［実施例］ 以下に比較例と共に実施例を掲げて本発明を更に説明す
るが本発明はこれに限定されるものではない。
で示される色素を使用しその１重量％テトラヒドロフラ
ン溶液をスピンナで塗布し乾燥させて膜厚０．０５μ閣
の記録層を得た。反射率は４５８ｎｍで２０％あり、Ａ
ｒレーザで記録できた。
［発明の効果］ 以上説明したように、本発明の光情報記録媒体は、記録
層に特定のポリエン化合物を含有することにより波長４
０００層〜５００ｎ鰯付近での光吸収能力が極めて大き
く、ｌｏｇ（分子吸収光係数）は５．０前後を示すもの
が多い。そのために波長４００ｎｓ〜５００ｎｓ付近の
レーザ光に対する記録性にすぐれており、高密度記録が
可能である。
【図面の簡単な説明】
第１〜６図は、本発明の光情報記録媒体の層構成を説明
する図。

Claims (1)

  1. 【特許請求の範囲】 基板上に下記一般式で示されるジアリールポリエン化合
    物を含む薄膜を設けたことを特徴とする光情報記録媒体
    。 ▲数式、化学式、表等があります▼ （式中、 Ａ＿１、Ａ＿２：アリール基、Ａ＿１とＡ＿２は同一で
    も異なっていてもよい。 Ｒ＿１、Ｒ＿２：水素原子又はハロゲン、アルキル基な
    どの置換基 ｎ：２以上の整数 を表わす）
JP2190407A 1990-07-20 1990-07-20 光情報記録媒体 Expired - Fee Related JP3026586B2 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2190407A JP3026586B2 (ja) 1990-07-20 1990-07-20 光情報記録媒体
US07/732,038 US5196250A (en) 1990-07-20 1991-07-18 Optical information recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2190407A JP3026586B2 (ja) 1990-07-20 1990-07-20 光情報記録媒体

Publications (2)

Publication Number Publication Date
JPH0478576A true JPH0478576A (ja) 1992-03-12
JP3026586B2 JP3026586B2 (ja) 2000-03-27

Family

ID=16257632

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (2)

Country Link
US (1) US5196250A (ja)
JP (1) JP3026586B2 (ja)

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Publication number Priority date Publication date Assignee Title
EP1262966A2 (en) 1999-12-28 2002-12-04 Mitsui Chemicals, Inc. Optical recording medium and novel azaporphyrin compound
EP1930339A2 (en) 2001-10-22 2008-06-11 Mitsui Chemicals, Inc. Imide compound

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JP3026586B2 (ja) 2000-03-27

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