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JPH0762919B2 - 再生専用型光ディスク - Google Patents

再生専用型光ディスク

Info

Publication number
JPH0762919B2
JPH0762919B2 JP1125053A JP12505389A JPH0762919B2 JP H0762919 B2 JPH0762919 B2 JP H0762919B2 JP 1125053 A JP1125053 A JP 1125053A JP 12505389 A JP12505389 A JP 12505389A JP H0762919 B2 JPH0762919 B2 JP H0762919B2
Authority
JP
Japan
Prior art keywords
optical disc
read
play
substrate
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
JP1125053A
Other languages
English (en)
Other versions
JPH02304734A (ja
Inventor
喜光 小林
欣幸 城阪
高志 橋本
敏史 川野
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.)
Mitsubishi Chemical Corp
Original Assignee
Mitsubishi Chemical 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 Mitsubishi Chemical Corp filed Critical Mitsubishi Chemical Corp
Priority to JP1125053A priority Critical patent/JPH0762919B2/ja
Priority to US07/524,078 priority patent/US5276673A/en
Priority to CA002017059A priority patent/CA2017059A1/en
Priority to KR1019900007058A priority patent/KR900018936A/ko
Priority to DE69012204T priority patent/DE69012204T2/de
Priority to EP90305334A priority patent/EP0398714B1/en
Publication of JPH02304734A publication Critical patent/JPH02304734A/ja
Publication of JPH0762919B2 publication Critical patent/JPH0762919B2/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
    • G11B7/252—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
    • 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
    • G11B7/2585—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 aluminium
    • 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
    • G11B7/254—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
    • G11B7/2542—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 consisting essentially of organic 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
    • G11B7/253—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
    • 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

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は光学的読み出しを行なう再生専用型光ディスク
に関する。
〔従来の技術とその課題〕
再生専用型光ディスクは低コストな大容量の記録媒体と
して既に広く実用化されている。特に音楽再生用、画像
再生用として普及がめざましい。
再生専用型光ディスクの構成は記録信号に相当するビッ
ト（凹凸）を表面に形成した透明基板上に反射膜（通常
Al）を蒸着し、さらに樹脂による保護コートをしてな
る。
しかしながら、この構成には耐候性に問題が残ってい
る。例えば、温湿度の急激な変化を与えた場合の基板の
膨張、収縮に伴う反射膜の剥離または高温、高湿下での
反射膜の酸化等は直接エラーレートの増加とつながり、
光ディスクの信頼性を大きく低下させる。
特に高温、低温等の特殊環境下における使用をおこなう
場合、上記耐候性の問題は非常に重要になる。
〔課題を解決する為の手段〕
本発明者等は、上述の課題に鑑み、高耐候性を持った再
生専用型光ディスクを提供すべく鋭意検討した結果特定
の反射層を選択することにより非常に耐候性に優れたデ
ィスクが得られることを見出した。
〔発明の構成〕
本発明の要旨は、凹凸情報が形成された透明基板上に反
射層を設けてなる再生専用型光ディスクにおいて前記反
射層がTaを含有したAl合金からなることを特徴とする再
生専用型光ディスクに存する。
以下本発明を詳細に説明する。
本発明に用いられる基板は再生光を透過する為に透明な
ものであり、ガラスやガラス上にフォトポリマー樹脂を
塗布したもの又はポリカーボネート、ポリメチルメタク
リレート（PMMA）等の樹脂が好ましく用いられる。これ
らの基板はあらかじめ情報が記録されてある型（スタン
パー）の転写を行なったり、情報が記録されたマスクを
密着させてエッチングをすることにより、表面に情報に
相当する凹凸を形成することができる。基板の厚さは1.
2mmが標準である。
前記基板上に通常再生光を反射させる為の反射層を形成
するが、本発明においては反射層としてTaを含有するAl
合金を用いる。Taを含有するAl合金はAl単体の膜に比べ
耐食性に優れ、ディスクの高信頼性を確保することにな
る。Taの含有量としては好ましくは0.1〜15原子％（at
％）さらに好ましくは0.5〜10at％である反射層の膜厚
としては好ましくは300Å以上１μｍ以下、さらに好ま
しは500Å以上5000Å以下である。
多くの場合、さらに樹脂を用いた保護層がこの上に形成
される。樹脂としては紫外線硬化型やホットメルト型が
好ましく用いられる。この樹脂保護層の膜厚は好ましく
は３μｍ以上300μｍ以下さらに好ましくは５μｍ以上2
00μｍ以下である。
基板上に前記反射層を形成する方法としては通常の真空
蒸着法が好ましく用いられる。
すなわち、熱蒸着、電子ビーム蒸着、スパッタ蒸着等で
ある。
樹脂保護層を設けるには、スピンコート法、ロールコー
ト法等が用いられる。
〔実施例〕
以下に実施例をもって本発明をさらに詳細に説明する
が、本発明はその要旨を越えない限り以下の実施例に限
定されるものではない。
実施例１ トラッキング用のグループ及び凹凸情報を持った130mm
φのポリカーボネート基板をスパッタ装置内に導入し、
８×10-7Torr以下まで排気した後、Al97Ta3（at％）の
組成を持った合金ターゲットをArガスでDCスパッタリン
グすることにより基板上にAl96Ta4（at％）の組成を持
った反射層を1000Å形成した。組成の分析は螢光Ｘ線分
析を用いて行なった。このようにして得られたディスク
を70℃、90％RHの条件で1000時間の加速試験を行ない、
経時的にドロップインエラーレートを測定したところ増
加は1.6倍に止まった。結果を第１図に示した。
比較例１ 実施例１と同様にして、基板上にAl単体の膜を1000Å成
膜した。このディスクを実施例１と同様に加速試験を行
なったところ全面に腐食が発生しエラーレートは測定不
能だった。結果を第１図に示した。
〔発明の効果〕
本発明の再生専用型光ディスクは耐候性に優れる。
【図面の簡単な説明】
第１図は実施例１および比較例１の加速試験によるエラ
ーレートの増加率を示したものである。図中（イ）は実
施例１の測定結果を、（ロ）は比較例１の測定結果を示
す。
───────────────────────────────────────────────────── フロントページの続き (72)発明者 川野 敏史 神奈川県横浜市緑区鴨志田町1000番地 三 菱化成株式会社総合研究所内 (56)参考文献 特開 平１−169751（ＪＰ，Ａ)

Claims (2)

    【特許請求の範囲】
  1. 【請求項１】凹凸情報が形成された透明基板上に反射層
    を設けてなる再生専用型光ディスクにおいて、前記反射
    層がTaを含有したAl合金からなることを特徴とする再生
    専用型光ディスク。
  2. 【請求項２】前記反射層がTaを0.1〜15at％含有するAl
    合金であることを特徴とする特許請求の範囲第１項記載
    の再生専用型光ディスク。
JP1125053A 1989-05-18 1989-05-18 再生専用型光ディスク Expired - Lifetime JPH0762919B2 (ja)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP1125053A JPH0762919B2 (ja) 1989-05-18 1989-05-18 再生専用型光ディスク
US07/524,078 US5276673A (en) 1989-05-18 1990-05-16 Read-only optical disk containing a reflective layer comprising an Al alloy containing Ta
CA002017059A CA2017059A1 (en) 1989-05-18 1990-05-17 Read-only optical disk
KR1019900007058A KR900018936A (ko) 1989-05-18 1990-05-17 판독 전용 광학 디스크
DE69012204T DE69012204T2 (de) 1989-05-18 1990-05-17 Optische Platte zum Lesen der Aufzeichnung.
EP90305334A EP0398714B1 (en) 1989-05-18 1990-05-17 Read-only optical disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1125053A JPH0762919B2 (ja) 1989-05-18 1989-05-18 再生専用型光ディスク

Publications (2)

Publication Number Publication Date
JPH02304734A JPH02304734A (ja) 1990-12-18
JPH0762919B2 true JPH0762919B2 (ja) 1995-07-05

Family

ID=14900660

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1125053A Expired - Lifetime JPH0762919B2 (ja) 1989-05-18 1989-05-18 再生専用型光ディスク

Country Status (6)

Country Link
US (1) US5276673A (ja)
EP (1) EP0398714B1 (ja)
JP (1) JPH0762919B2 (ja)
KR (1) KR900018936A (ja)
CA (1) CA2017059A1 (ja)
DE (1) DE69012204T2 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009038046A1 (ja) 2007-09-19 2009-03-26 Kabushiki Kaisha Kobe Seiko Sho 読み出し専用の光情報記録媒体

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3170062B2 (ja) * 1992-09-25 2001-05-28 パイオニア株式会社 光ディスク
US5698284A (en) * 1994-09-21 1997-12-16 Dai Nippon Printing Co., Ltd. Optical recording medium
AU744670B2 (en) * 1995-02-24 2002-02-28 Sony Corporation Optical recording medium and method of producing same
JP3241560B2 (ja) * 1995-02-24 2001-12-25 ソニー株式会社 光学記録媒体及びその製造方法
AU5810196A (en) * 1995-07-21 1997-02-18 Bod Berlin Optical Disc Gmbh Method of producing an information-bearing disc which can be scanned by a laser beam, and disc produced thereby
JP2001307381A (ja) * 2000-04-24 2001-11-02 Sony Corp 光学記録媒体
US6733950B2 (en) * 2001-03-14 2004-05-11 General Electric Company Limited play data storage media and method for limiting access to data thereon
JP5331420B2 (ja) 2008-09-11 2013-10-30 株式会社神戸製鋼所 読み出し専用の光情報記録媒体および該光情報記録媒体の半透過反射膜形成用スパッタリングターゲット

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5661048A (en) * 1979-10-22 1981-05-26 Nippon Telegr & Teleph Corp <Ntt> Optical memory medium
JPS5720933A (en) * 1980-07-14 1982-02-03 Toshiba Corp Information recording carrier
JPS6266444A (ja) * 1985-09-19 1987-03-25 Sharp Corp 光メモリ素子用フオトマスク
US5013594A (en) * 1987-09-25 1991-05-07 Hitachi Maxwell, Ltd. Optical information recording medium and its production
US5155723A (en) * 1988-07-30 1992-10-13 Yuden Co., Ltd. Taiyo Optical information recording method and medium
US5215799A (en) * 1989-01-25 1993-06-01 Idemitsu Petrochemical Co., Ltd. Optical disk substrate and optical information-storage medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009038046A1 (ja) 2007-09-19 2009-03-26 Kabushiki Kaisha Kobe Seiko Sho 読み出し専用の光情報記録媒体

Also Published As

Publication number Publication date
CA2017059A1 (en) 1990-11-18
EP0398714A3 (en) 1991-01-16
JPH02304734A (ja) 1990-12-18
EP0398714B1 (en) 1994-09-07
KR900018936A (ko) 1990-12-22
DE69012204T2 (de) 1995-01-19
EP0398714A2 (en) 1990-11-22
US5276673A (en) 1994-01-04
DE69012204D1 (de) 1994-10-13

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