JPH03144938A - 光メモリ素子 - Google Patents

光メモリ素子

Info

Publication number
JPH03144938A
JPH03144938A JP1284602A JP28460289A JPH03144938A JP H03144938 A JPH03144938 A JP H03144938A JP 1284602 A JP1284602 A JP 1284602A JP 28460289 A JP28460289 A JP 28460289A JP H03144938 A JPH03144938 A JP H03144938A
Authority
JP
Japan
Prior art keywords
optical memory
layer
light
memory element
memory 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.)
Pending
Application number
JP1284602A
Other languages
English (en)
Inventor
Kenji Ota
賢司 太田
Kazuo Ban
和夫 伴
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.)
Sharp Corp
Original Assignee
Sharp 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 Sharp Corp filed Critical Sharp Corp
Priority to JP1284602A priority Critical patent/JPH03144938A/ja
Priority to US07/604,581 priority patent/US5192644A/en
Priority to EP90311890A priority patent/EP0426437B1/en
Priority to DE69032173T priority patent/DE69032173T2/de
Publication of JPH03144938A publication Critical patent/JPH03144938A/ja
Pending 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
    • 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
    • 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
    • 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
    • G11B2007/25708—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
    • 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
    • G11B2007/25713—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 nitrogen
    • 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
    • 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
    • G11B7/245—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 a polymeric component
    • 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
    • G11B7/2467—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 azo-dyes
    • 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
    • G11B7/2531—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
    • 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
    • Y10S430/163—Radiation-chromic compound

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Optical Record Carriers And Manufacture Thereof (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】 （イ）産業上の利用分野 本発明は、光メモリ素子に関する。
（ロ）従来の技術 近年、光により情報の記録、再生及び消去を行う光メモ
リ素子は高密度大容量メモリ素子として年々その必要性
が高まっている。従来の光メモリ素子としては、第２図
に示すように、基［１１の上に、波長λ、の光で記録で
きる光メモリ層Ｒ１を設け、該光メモリ層Ｒ７の上に波
長λ、の光で記録できる光メモリ層Ｒ３を設け、以下順
次波長λｎの光で記録できる光メモリ層Ｒｎを設けた構
造を有し、それぞれの光メモリ層に、異なる波長の光を
照射してｎ層の多重記録ができる光メモリ素子が知られ
ている（特開昭８２−１６５７５１号公報）。
（ハ）発明が解決しようとする課題 ところが、上記光メモリ素子の第１層（ｉ≦ｎ）に光を
照射して情報を記録しようとするとき、ｉ層の温度上昇
により、ｉ層の前後の層［（＋−１）層と（ｉ層１）層
］の温度が上昇し、（ｉ−１）層や（ｉ層１）層に記録
が消失したり、場合によっては光メモリ層（第１層）そ
のものが破壊されるという問題がある。
この発明は、この問題を解決するためになされたもので
あって、光の照射による温度上昇が小さく記録の消失や
光メモリ層の破滅を起こさない光メモリ素子を提供しよ
うとするものである。
（ニ）課題を解決するための手段 この発明によれば、基板上に、フォトクロミック材料か
らなる襟敗の光メモリ層が熱伝導性透明膜を介して積層
されてなる光メモリ素子が提供される。
この発明における１＆仮は、光メモリ素子を支持するた
めのものであって、例えばガラス、プラスチック、アル
ミニウム等を用いて形成することができろ。この中でも
ガラス、プラスチック等の透明な材料によって形成した
基板は基板の上方または下方のいずれの側からも光を照
射することができるので好ましい。また基板の下方から
基板を通して光を入射させるときは、基板の厚みは０．
５〜２．０１＋ｍ程度が好ましい。
この発明におけるフォトクロミック材料は、前記基板の
上に光メモリ層を形成するためのものであって、光の照
射により互変異性化など構造変化か可逆的に生じ同時に
吸収スペクトルが変化する有機化合物を用いることがで
き、例えばスピロベンゾビラン誘導体、フルギド化合物
等が挙げられる。
この発明における光メモリ層は、光の照射によって光メ
モリ層に生じた露光を記録するためのものであって、光
メモリ層を構成するフォトクロミック材料の化学構造に
対応して特有の波長の光に対して感光することができる
。また、この光メモリ層は、複数で光メモリ素子を構成
することができ、通常それぞれ異なった波長の光に対し
て感光性を有するように構成することができる。また、
この光メモリ層は前記フォトクロミック材料のみで作製
してもよいが、適宜色素材料を混合して作製してしよい
。
この発明における熱伝導性透明膜は、露光によって感光
した光メモリ層において発生する熱を放散させ光メモリ
層の温度を抑制するためのちのであって、複数の光メモ
リ層の間に介在させて用いられ、熱伝導率が光メモリ層
よりも高く、かつ光メモリに使用する光を充分透過する
ことが必要であることから、例えば窒化アルミニウム、
窒化シリコン、酸化アルミニウム等の薄膜を用いるのが
適している。
この薄膜（熱伝導性透明膜）は、形成する薄膜のＷ類に
よって、例えばＣＶＤ法、スパッタリング法等の手段を
適宜選択して用いることにより形成することができ、そ
の膜厚を、通常５０〜３５０ｎｍ。
好ましくは６０〜７５ｎｍ、もしくは３３０ｎｍ〜３４
５ｒｖとすることができる。また、この熱伝導性透明膜
は、複数の光メモリ層の間に適宜介在させればよいが、
それぞれの光メモリ層毎にその上面と下面に配置する方
が光メモリ層の温度上昇をよく抑えることができるので
好ましい。
この発明においては、基板上に光メモリ層が熱伝導性透
明膜を介して積層した後、この上に、例えばＵＶ硬化樹
１１１ｉ１　（ハードコート膜）からなる保ｆｆｌ＠を
形成してもよい。
（ホ）作用 熱伝導性透明膜が、光が照射された光メモリ層に発生す
る熱を放牧し光メモリ層の温度上昇を抑制する。
（へ）実施例 本発明の実施列を図面をもとにして説明する。
まず、第１図に示すように直径１ａＱｍｍｓ厚さ１．２
１のガラス基板ｌの上に、ＣＶＤ法によって膜厚０．３
３μｍの窒化アルミニウム嘆２ａ（ｐＡ伝導率約２０Ｊ
／ｍ−５４，透明）を形成する。次に、この上にスピン
コード法によって、膜厚的０．７μ龜の式で表されるオ
キサゾール誘導体置換へテロ型フルギド化合物の層３（
波長４６２ｎｍの光に感応性の光メモリ層）を形成する
。
この上に、再び膜厚０．３３μｍの窒化アルミニウム１
ｉ２ｂを形成し、この上にスピンコード法によって膜厚
的０．７μｍの式 で表されるチオフェン誘導体置換へテロ型フルギド化合
物の層４（波長５２３ｎｍの光に感応性の光メモリ層）
を形成する。
この上に、３回目の膜厚０．３３μｍの窒化アルミニウ
ム＠２ｃを形成し、更にこの上にスピンコード法によっ
て膜厚約０．７μｍの式 で表されるビロール誘導体置換へテロ型フルギド化合物
の層５（波＆６１４ｎｍの光に感応性の光メモリ層）を
形成する。
この上に４回目の膜厚０１３３μ九の窒化アルミニウム
膜２ｄを形成して光メモリ素子を作製する。
得られた、光メモリ素子は、４６２ｎｎ、　５２３ｎｎ
および６１４ｎｎの光を照射して記録試験を行ったとこ
ろ、光メモリ層の温度上昇は小さくなり記録の安定性が
向上することが認められた。
（ト）発明の効果 この発明によれば、光の照射による温度上昇が小さく、
記録の消失や光メモリ層の破壊を起こさない光メモリ素
子を提供することができる。
【図面の簡単な説明】
第１図は、本発明の実施例で作製した光メモリ素子の説
明図、第２図は、従来の光メモリ素子の説明図である。 し・・・・・ガラス基板、 ２ａ、２ｂ、２ｃ、２ｄ・・・・・・窒化アルミニウム
膜、 ３・・・・・・オキサゾール誘導体置換へテロ型フルギ
ド化合物の層、 ４・・・・・・チオフェン誘導体置換へテロ型フルギド
化合物の層、 ５・・・・・・ビロール誘導体置換へテロ型フルギド化
合物の層。

Claims (1)

    【特許請求の範囲】
  1. １、基板上に、フォトクロミック材料からなる複数の光
    メモリ層が熱伝導性透明膜を介して積層されてなる光メ
    モリ素子。
JP1284602A 1989-10-30 1989-10-30 光メモリ素子 Pending JPH03144938A (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP1284602A JPH03144938A (ja) 1989-10-30 1989-10-30 光メモリ素子
US07/604,581 US5192644A (en) 1989-10-30 1990-10-29 Optical memory device
EP90311890A EP0426437B1 (en) 1989-10-30 1990-10-30 Optical memory device
DE69032173T DE69032173T2 (de) 1989-10-30 1990-10-30 Optische Speichervorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1284602A JPH03144938A (ja) 1989-10-30 1989-10-30 光メモリ素子

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JPH03144938A true JPH03144938A (ja) 1991-06-20

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US (1) US5192644A (ja)
EP (1) EP0426437B1 (ja)
JP (1) JPH03144938A (ja)
DE (1) DE69032173T2 (ja)

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JPH07109573A (ja) * 1993-10-12 1995-04-25 Semiconductor Energy Lab Co Ltd ガラス基板および加熱処理方法
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US6413680B1 (en) * 1998-02-26 2002-07-02 Kabushiki Kaisha Toyota Chuo Kenkyusho Optical recording method, optical recording medium, and optical recording system
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US8663873B2 (en) 2012-01-13 2014-03-04 Sabic Innovative Plastics Ip B.V. Holographic recording medium and method of recording a hologram

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JPS5616948A (en) * 1979-07-23 1981-02-18 Nippon Telegr & Teleph Corp <Ntt> Optical memory medium
US4737379A (en) * 1982-09-24 1988-04-12 Energy Conversion Devices, Inc. Plasma deposited coatings, and low temperature plasma method of making same
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JPS61175087A (ja) * 1985-01-31 1986-08-06 Canon Inc 像形成・消去方法
JPH07111788B2 (ja) * 1987-01-23 1995-11-29 株式会社日立製作所 光情報記録媒体
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JPS63252790A (ja) * 1987-04-10 1988-10-19 Canon Inc 光記録媒体
JPS63306090A (ja) * 1987-06-05 1988-12-14 Mitsubishi Electric Corp 光学的情報記憶媒体
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JPH01148590A (ja) * 1987-12-07 1989-06-09 Agency Of Ind Science & Technol 光学記録媒体
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JPH02105346A (ja) * 1988-10-13 1990-04-17 Fuji Electric Co Ltd 光記録媒体
JPH02230528A (ja) * 1989-03-03 1990-09-12 Toppan Printing Co Ltd 光記録媒体

Also Published As

Publication number Publication date
EP0426437B1 (en) 1998-03-25
DE69032173D1 (de) 1998-04-30
DE69032173T2 (de) 1998-10-08
EP0426437A2 (en) 1991-05-08
US5192644A (en) 1993-03-09
EP0426437A3 (en) 1992-04-15

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