TWI307091B - Optical information recording medium and regeneration method - Google Patents

Optical information recording medium and regeneration method Download PDF

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Publication number
TWI307091B
TWI307091B TW092104661A TW92104661A TWI307091B TW I307091 B TWI307091 B TW I307091B TW 092104661 A TW092104661 A TW 092104661A TW 92104661 A TW92104661 A TW 92104661A TW I307091 B TWI307091 B TW I307091B
Authority
TW
Taiwan
Prior art keywords
film
light
layer
temperature
recording medium
Prior art date
Application number
TW092104661A
Other languages
English (en)
Other versions
TW200407865A (en
Inventor
Takamori Nobuyuki
Tajima Hideharu
Takahashi Akira
Original Assignee
Sharp Kk
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Publication date
Application filed by Sharp Kk filed Critical Sharp Kk
Publication of TW200407865A publication Critical patent/TW200407865A/zh
Application granted granted Critical
Publication of TWI307091B publication Critical patent/TWI307091B/zh

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
    • 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
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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    • 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
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    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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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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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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    • 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
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    • 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
    • G11B7/248—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 porphines; azaporphines, e.g. phthalocyanines
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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    • 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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    • G11B7/253—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
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    • 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
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    • 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]
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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    • 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
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    • G11B7/2535—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 polyesters, e.g. PET, PETG or PEN
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    • 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
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    • 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
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Nanotechnology (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
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~、贫明說明： ----二:二i 【發明所屬之技術領域】 詳ΐ發明係有關-種光資訊記錄媒體及再生方法，進一步 二’係有關一種可光學地記錄·再生資訊的 光資訊死錄媒體及再生方法。 【先前技術】 隨著資訊絲會的録化發展， 高密度的記錄再生。 ^中’期望 因此，為提升記錄容量，作為可寫入之光資訊 除了試驗各種媒體構成外，亦試驗下述各方法，Β以實現 密度的記錄再生。例如：i}縮短記錄再生用雷射光波長；Γ) 將聚先於光資訊記錄媒體的物鏡NA(開口度）擴大；叫使光 =綠媒體的記錄層為多層；iv)在光資訊記錄媒體形成 先罩層，以實際縮小雷射光的光點直徑。 、在光資訊記錄媒體形成光罩層而實際縮小光點直後之方 法’係揭示於例如日本㈣平5]期號公報、日 5-12715號公報、日本特開平細^训2號公報等。 这等方法中’在基板上具有記錄膜之光資訊記錄媒㈣ 中’相對於記錄膜，於光入射側設有光罩層。該光罩層： 般係由熱色性材料或相變化材料所形成，利用讀取光等光 照射使照射部分的中央部分溫度上升時，產生光學或熱變 化’使部分褪色’形成透光性’以縮小實際的光點大小； 另一方面，光未入射時及入射光較弱時，光的透光率會降 低。換t之，光罩層在光強度分佈高的地方利用光透射， 84071-961101.doc 1307091 4. 2 0 小麻點的記錄再生。如此，入射光的光點直徑實際 可對光資訊記錄媒體進行高密度的記錄再生。 上述光罩層藉由升溫至—定以上的溫度㈣融， 先罩效果，但溶融狀態下使流動性變高，而改變初期^熊 的組成或形狀。如此，在光資訊記錄媒體反覆進行： 切，利用光罩層組成或形狀的偏差，使料效應逐^ 乂’經由反複數千次左右，會有料效果消失殆盡的問題減 此外，光資訊記錄媒體中，由於在光入射側形 故到達記錄層的全光量很多而為光罩層所吸收，使=錄 :敏度降低，引發再生干擾增加等，而無法得到高信號品 负。 、又’由於光罩層利用其组成變化或色素反應改變透光率 或反射率’故例如即使升溫1001c，該等變化量與室溫相 …法使其物質的物性量以上產生冑化，而在得到高信 號品質方面受到限制。 【發明内容】 根據本發明，可提供一種光資訊記錄媒體，其特徵係在 基板上形成可依照溫度變化可逆改變反射率及/或透光率 之溫度感應層。 藉由上述構成，利用具有隨溫度變化而改變光折射率的 [生负之μ度感應層，或利用隨溫度變化而改變光干涉效應 t性質，可得到更高又穩定的再生信號強度。 此外根據本發明，可提供一種光資訊記錄媒體之再生 万法，對於上述光資訊記錄媒體照射光束，以在溫度感應 84071-950420.doc 1娜刪 r · ' . .... .... -· ; i ' j 層的光束1點直徑内產生高溫部與低溫部，並於前述溫度 感應膜的fl溫部與低溫部可逆地改變反射率及/或透光 率’以依據從高反射率的溫度區域反射的光，再生資訊。 如此，可確保高信號品質，以進行穩定的再生。 【實施方式】 本發明之光資訊記錄媒體主要係由基板及形成於基板上 的溫度感應層所構成。 基板-般以不㈣光人射，對料訊記錄制給予適當 強度者為佳。如此，可構成從基板側入射光型之光資訊纪 錄媒體。構成基板的材料並無特別限制，例如有：玻璃、 聚碳酸醋、非晶形聚埽烴、聚酿亞胺、附、咖、酬等 塑料、紫外線硬化型丙埽基樹脂等。基板一般以具有〇 ι〜12 mm左右的厚度為佳。 基板最好具有可記錄或再生資鼽的功能。例如，基板本 身’在其兩面或單面的一部份或全部，例如也可形成對應 於位址等資訊等之凹凸形狀麻點及/或導引用溝等。麻點^ 溝等間距，係例如0H 6从m左右，高低差係例如％〜咖 左右。此外’藉由在基板上形成記錄/再生層，也可具有上 述功此。本發明中’記綠’再生層可具有記錄或再生任一 者’或具有兩者之功能。另外，在基板上形成所謂的記錄/ 再生層時’藉由形成-層或二層以上，也可作為讀取及寫 入者。此外，也可為在基板本身具有凹凸，且在基板上形 成-層以上的記錄/再生層者。本發明中，再生層係指具有 超析像效應之光磁今銘! 尤兹记錄膜寺，其係將對應於基底記錄標記 84071-950420.doc JJt#" 之信號予以再生時，用以轉印之i 記錄/再生層一般可利用該領域通常使用的材科形成。例 如，作為隨記型媒體方面，可列舉青或西太青等有機色素 材料，料記錄再生消除型媒體，可列舉光磁記錄材細 如SiN寺介電質材料、稀土類過渡金屬合金⑽如彻心）記 錄膜、_等保護材料）、相變化記錄材料（例如Zn0· Si〇2 等介電質材料、GeTeSb、AgInSb、他歸等記錄膜、
ZnS/Sl〇2等保護膜）等。記錄/再生層的膜並無特別限制，例 士以5 5GG nm左右為佳。該等材料所形成的膜可利用賤射 法、蒸鍍法、EB法、CVD法、塗敷等周知方法形成。另夕卜， 用以只進行記錄/再生層的記錄之層方面，記錄/再生層在基 板表面也可形成形成有對應資訊的凹凸之透明中間層。該 透明中間層可藉由與例示材料相同者形成基板。透明中間 層的膜厚可藉由使用光的種類或波長、基板或後述之溫度 感應層等材料及厚度等而進行適當調整。例如，可列舉 10 60以m左右。此外，凹凸或其間距可列舉與上述範圍相 同的範圍。 另外，記錄/再生層作為隨記型記錄層時，有機色素膜/ 反射膜的層構造等；作為光磁記錄層時，介電質膜/光磁膜 (稀土類過渡金屬合金膜）/介電質膜/反射膜的層構造等；作 為相變化記錄層時’介電質膜/相變化膜（AglnSbTe合金膜） 介電質膜/反射膜的層構造等，以採用與該等相同或具有相 當於該等功能之層構造。 本發明之溫度感應層係可依照溫度變化而可逆改變光反 84071-961101.doc 1307091 射率透光率、反射率及透光率兩者之層。換言之，係依 照溫度變化，改變溫度感應膜折射率之層。此外，該溫度 感應層最好亦具有光干涉效應。在此，如圖6所示，光干涉 效應係指當溫度上升時，使光干涉程度變動，並藉此改變 光的折射率、反射率及/或透光率。 溫度感應層例如可由溫度感應膜單層、溫度感應膜與反 射膜的積層層等所形成。另外，利用積層層形成溫度感應 層時，溫度感應膜與反射膜不一定直接相接觸，也可在其 中間配置其他層。 溫度感應膜，例如係由含有可改變反射率及透光率之材 料所構成，以在20〜20〇t左右，最好在20〜180°C左右的溫 度範圍改變20~80%左右半透明膜的透光率者為佳。例如， 溫度感應膜的溫度上升時，透光率為上升的狀態（高透光率 狀態），入射光會穿透溫度感應膜。此外，形成反射膜時， 利用該反射膜反射，會形成高反射率狀態。另一方面，溫 度降低時透光率會降低。此外，形成反射膜時，會抑制該 反射膜的反射，而形成低反射率狀態。具體而言，可以構 成60°C〜180°C為高透光率狀態（高反射率狀態），2〇〇c〜6〇(>c 為低透光率狀態（低反射率狀態）之溫度感應膜等為例。另 外，溫度感應膜必須設定為可引發充分光干涉效應的膜 厚。例如，其實際上為透明，且其膜厚例如係5〜9〇〇 右，以40 nm以上為佳，而40〜6〇〇 nm左右最好。另外，此 處的透明係指例如透光率為50〜1 〇〇%左右。 構成溫度感應膜的具體材料’例如有：Sn〇2、Ce〇2、Ni〇2、 84071-950420.doc -10- 珊謂1 如等金屬氧化物構成的無機熱變色性物f;於㈣旨、妙 等添加石咸者；於無色素等添加有機酸者等的有機熱變色 性物質。另外，熱變色性物質係指藉由吸收熱引起化學性 構造變化，並改變折射率之 ， j千疋物免。又，孩等材料構成的膜 可利用濺射法、蒸鍍法、邱法、塗敷法、溶膠凝膠法等周 知方法而形成。 反射膜形成於基板上，例如，基板具有利用基板本身的 凹凸記錄或再生資訊的功能時，〃密著於基板表面凹凸而 形成或經由後述之溫度感應膜而形成於基板表面的凹凸上 者為佳。此外’在基板上形成—層或複數層記錄/再生層 時，從光入射側看’於相對於該等記錄層之較遠侧，一般 以形成-層為佳。反射膜，例如最好藉由具高反射率之金 屬膜而形成’具體而τ，例如Ah Au、Ag或該等合金。反 射膜的膜厚並無特別限制，可調整為可實現所希望的反射 率之膜厚。例如’ 30〜100nm左右。該等材料構成的膜可利 用濺射法、蒸鍍法、EB法等周知方法而形成。 恤度感應層在光資訊記錄媒體中，可用作為光罩層、反 射層、或光罩層及反射層之兩功能層。 用作光罩層時，一般從光入射側看，在相對於記錄/再生 g、較侧 般以形成一層溫度感應層為佳。具體而言， 在基板上形成溫度感應膜，並在溫度感應膜上形成記錄 層’接著在記錄層上形成反射膜。此外，在基板上形成複 數層記錄·再生層時，在基板上依序形成第-溫度感應膜 及第-記錄膜’經由適當的中間層等，依序形成第二溫度 84071-950420.doc -11 - 感應膜及第二記錄膜，此外，經由適當的中間層等…依序 形成第η溫度感應膜及第n記錄膜，從光入射侧看，在相對 於所有記錄層之最遠側，形成反射膜。 如此’未照射入射的讀取或記錄光時或光照射較弱時， 可形成低透光率狀態（光干涉效應最低），光強時溫度感應膜 光學的或吸收光使溫度上升’產生熱變化，可形成高透光 率狀虑（光干涉效應最高），此外，可為相反的狀態。 用作反射層時’一般從光入射侧看，在相對於記錄再 生層之較遠侧，一般以形成一層溫度感應層為佳。因此， 在基板本身形成凹凸並具備記錄或再生資訊的功能之媒體 中，有以下情況：從光入射侧看於較遠側配置基板的凹凸 表面，其凹凸表面只有溫度感應膜；或依序形成溫度感應 膜和反射膜時，從光入射側較近側形成基板的凹凸表面， 其凹凸表面只有溫度感應膜；或形成溫度感應膜及反射 膜。此外，在基板上形成記錄.再生層時，在基板上形成 記錄.再生層，而在記錄.再生層上只有溫度感應膜，或 依序形成溫度感應膜及反射膜。藉此，未照射入射的讀取 或記錄光時或光照射較弱時，可使反射率低的光干涉效應 為最低狀態；光強時溫度感應膜光學性或吸收光使溫度上 升，產生熱變化，可使反射率高的光干涉效應為最高狀態。 八fla而σ /皿度感應膜藉由再生光的中心部分，亦即，利 用光能使溫度上升’改變溫度感應膜的折射率，使上述反 射膜造成的反射率上升，並以再生光波長於光干涉效應中 使反射率達至最高。另一方面，於再生光的外周部分，相 84071-950420.doc -12- 1307091 對溫度較低的部分’保持低的光反射率。另外，記錄.再 生層為複數時’離再生光更遠的記錄.再生層巾，可適應 上述反射型溫度感應膜。 分別利用光罩層及反射膜兩功能層時，_般從光入射側 看’以在相對於記錄·再生層之較近侧與較遠侧各形成一 層溫度感應層為佳。具體而言，在基板上形成溫度感應膜， 並在μ度感應膜上形成記錄層，接著在記錄層上依序形成 溫度感應膜與反射膜。如此，光罩層及反射膜中，兼具上 述功能，並可更提升再生分解能。另外，記錄·再生層為 複數時ϋ再生光更遠的記錄.再生層中，可適應上述反 射型溫度感應膜。 本發明之光資訊記錄媒體，從光入射侧看，以在較遠側 形成保護層為佳。保護層保護記錄·再生層、溫度感應膜 等，並對光資訊記錄媒體給予適當的強度，故也可由任何 材料形成。具體而言，例如與基板相同的材料。另外，保 護層可為透明，也可為不透明。保護層一般最好具有iHoo # m左右的厚度。此外，也可於任意位置形成絕熱層。絕熱 層可利用例如ZnS、Si〇2、SiN、Zr〇2等材料，其膜厚例如 5〜100 nm左右。 如上所述’本發明之光資訊記錄媒體，可使用各種態樣 組合基板及溫度感應層與其他任意層。其組合的具體例， 例如從光入射側，可列舉如下： 基板（凹凸有•無V溫度感應膜/保護層、 基板（凹凸有•無）/溫度感應膜/反射膜/保護層、 84071-950420.doc -13- I3_l 基板（凹凸有•無）/溫度感應膜/光吸收膜/反射膜/保護層、 基板（凹凸有•無）/溫度感應膜/光吸收膜/絕熱層/反射膜/ 保護層、 基板（凹凸有•無）/溫度感應膜/記錄層/保護層、 保遵層/溫度感應膜/基板（凹凸有•無）、 保護層/溫度感應膜/反射膜/基板（凹凸有•無）、 保護層/溫度感應膜/光吸收膜/反射膜/基板（凹凸有•無）、 保護層/溫度感應膜/光吸收膜/絕熱層/反射膜/基板（凹凸 有•無）、 保護層/溫度感應膜/記錄層/基板（凹凸有•無）、 (空氣層）/溫度感應膜/基板（凹凸有•無）、 (空氣層）/溫度感應膜/反射膜/基板（凹凸有•無）、 (空氣層）/溫度感應膜/光吸收膜/反射膜/基板（凹凸有· ) > <、、、) (空氣層）/溫度感應膜/光吸收膜/絕熱層/反射膜/基板（凹 凸有•無）、 (空氣層）/溫度感應膜/記錄層/基板（凹凸有•無） 保護層/溫度感應膜/中間層（凹凸有）/.../溫度感應膜/基 板（凹凸有•無）、 (空氣層）/溫度感應膜/中間層（凹凸有）/.../溫度感應膜纔 板（凹凸有•無）、 保遵層/溫度感應膜/記錄層/中間層（凹凸有）/.../溫度感 應膜/ §己錄層/基板（凹凸有•無）、 (空氣層）/溫度感應膜/記錄層/中間層（凹凸有）/.··/溫度感 84071-950420.doc -14- Τ1ίΠ_2104661號專利申請案 ί —……一 s 明書替換頁(96年11月）卜干(（乃獻替觀： . 應膜/記錄層/基板（凹凸有•無）等。另外了空㈣係顯示在 大氣露出溫度感應膜側之狀態。 藉由上述構成，可實現單屏卸銘 貝兄早層记錄/再生構造、多層記錄/ 再生構造的，亦即不具有CD、rn d ^
^ ^ CD-ROM > DVD ^ DVD-ROM 等可寫入的記錄/再生層之#咨 層之尤貝訊圮錄媒體；亦即具有 CD-R、CD-RW、DVD-R、πνπ dti7· τ^λ DVD_RW、DVD-RAM、ΜΟ 等可 寫入1己錄/再生層之光資訊記錄媒體。 也可為磁盤狀、亦即 也可為光磁碟、相變 另外，本發明之光資訊記錄媒體 圓盤狀光碟’卡片狀或片狀等形狀 化型光碟等各種光資訊記錄媒體。 此外了以下述方式構成：藉由重複積層上述構造，例 如在二件基板上形成溫度感應膜與金屬反射膜，或溫度感 應膜、金屬反射膜及記錄.再生層，以相對其溫度感應膜、 金屬反射膜及記錄.再生層之方式接合該等基板，以從兩 基板侧進行光照射。此外，將再生專用面與可記錄再生面 相混和’也可為複合式媒體。 另外，本發明之光資訊記錄媒體，係利用非常有用的超 析像再生方式者，其藉由用以於光入射侧改變透光率而設 置的光罩層等，相對於縮小光束光點直徑，藉由最高與最 低的光干涉效應，使透光率差大。 以下’依照圖面詳細說明本發明之光資訊記錄媒體的實 施形態。 實施例1 例如’如圖1所示’本發明之光資訊記錄媒體從入射光i i 84071-961101.doc •15- 1307091 側依序形成透明基板12、溫度感應膜13、反射膜14及保護 層15，以作為再生專用光資訊記錄媒體1〇。 透明基板11 ’例如’可由膜厚0.6 mm左右的聚碳酸酯形 成’於其單面（内側）形成有資訊麻點及導引溝。溫度感應膜 13係由膜厚860 nm左右的Ce〇2所形成；此外，反射膜⑷系 由膜厚100 nm左右的A1膜形成。 光資訊記錄媒體例如可由以下方法製造。 首先藉由磁控管濺射法在具有刻設資訊麻點及導引溝 的面（資訊面）之透明基板12依序使溫度感應膜13及金屬反 射膜14成膜。 a最後，為了從外邵環境保護該等資訊記錄面及溫度感應 膜13等，自旋式塗敷紫外線硬化型丙婦基樹脂等，並利用 UV照射使其硬化’以形成保護層丨5。 再生專用光資訊記錄媒體再生資訊時’在基板12的資訊 麻點或導引溝從基板側導引再生光（雷射光束），將其反射光 作為再生信號。 例如，從基板侧入射再生光（442 nm)時，如圖6所示，溫 度感應膜藉由光入射使溫度上升的部分，例如，只有在光 點直徑中心部分的光能強度較強的部分，使透光率上升， 光干涉效應達取1¾狀態’並以背面金屬反射膜反射，使作 為具光干涉效應的溫度感應膜達高反射率狀態。另一方 面，光外周部分，亦即相對溫度較低的部分，保持低透光 率（光干涉效應為最低狀態 > 因此，再生光只有在光點直徑 中心部分會透射，在光外周部分，光幾乎不會穿透溫度感 84071-950420.doc -16- 1307091 祐· 4, 2 0 應膜，背面的金屬反射膜也幾乎不會反射，使作為具光干 涉效應的溫度感應膜達低反射率狀態。 此外’溫度降低時使透光率下降，抑制背面金屬反射膜 的反射，使溫度感應膜為低反射率狀態。 如此，藉由將對應刻設有資訊麻點的基板面（資訊面）之資 訊及再生光點直徑更加縮小，可確實再生，以作為更大的 再生信號強度。 實施例2 如圖2所示，記錄.再生用光資訊記錄媒體2〇從入射光侧 依序形成透明基板12、記錄·再生層16、溫度感應膜& 反射膜14及保護層15。記錄·再生層16例如係由siN介電質 膜、TbFeCo記錄膜、SiN保護膜的積層構造所形成。 上述光資訊記錄媒體從入射光看，在記錄層背面設有溫 度感應膜，故再生時，將再生光（雷射光束）導引至透明基板 的導引溝時，再生光通過記錄層而入射溫度感應膜。如上 所述，藉由光的入射，溫度感應膜縮小折射率，使反射率 上升，並以再生光波長於光干涉效應下使反射率達最高。 另一方面，於再生光外側，溫度感應膜保持折射率增加， 反射率降低之狀感。如此，依據記錄於記錄層的資訊，以 再生信號鬲的強度反射背面的金屬反射膜，可得到更強大 的再生信號。 實施例3 如圖3所示，記錄.再生用光資訊記錄媒體3〇除替換記 錄.再生層16與溫度感應膜13外，實際上與實施例二之光 84071-950420.doc -17· 資訊1己錄媒體相同構成。 _上述之光資訊記錄媒體中，再生時可得到與上述實際相 5勺強大再生號。另一方面，記錄時，例如利用比再生 時高的雷射能，通過溫度感應膜，藉由加熱記錄層，可進 行記錄。 實施例4 、、圖斤示"己錄•再生用光資訊記錄媒體40從入射光側 、序〉成透明基板12、溫度感應膜13&、記錄•再生層】6&、 中門層17、溫度感應膜13b、記綠•再生層^❿、反射膜 14及保護層丨5 1明中間層例如係由與透明基板丨2及保護 層15相同的材料，以3〇/zm左右的厚度形成。 實施例5 溫度光:應訊:錄媒體在透明基板上形成215 ―膜作為 對。光資訊記錄媒體照射408 nm波長的光時相對於常溫 勺低反射率，在2〇〇 C的向溫反射率増加22%。如此， :口、有記錄再生光束的高溫部為實際的光束直徑，由於較以 往之光束直徑小之光束直徑可記錄再生，故可進行比光束 繞射限制少的標記之微小記錄再生。 ，根據本發明’由於在基板上形成可依據溫度變化可逆β :反射率及透光率之溫度感應層，故藉由照射光的聚光名 -度上升中心部使反射率上升或下降，在溫度低的周邊匈 2持反射率的下降或上升。此外，在光人射側配置溫廣 …忽層時，藉由照射光的聚光，在溫度上升的中心部份使 84071-950420.doc -18 - 1307091 升ί下降’在溫度低的周邊部分保持反射率的下 :精由孩寺效應’可確實，高精度且有效地再生 比照射光的光點直徑小之中心部❾，以 資訊記錄媒體。 牙員度问的先 此外：進一步形成記錄層時’尤其在溫度感應反射層與 板間進:步形成記錄層時，記錄独錄層的資訊與上述 相同，可高精度又確實地進行再生。 又’根據本發明，可石舍&古2二& 了雀保间彳s唬品質’以進行穩定的再 生。 【圖式簡單說明】 圖1為本發明之弁杳知 元，、訊$錄媒體一例的主要部分概略剖 面圖。 圖為本發明之光資訊記錄媒體其他例的主要部分概略 剖面圖。 *為本發月之光資訊1己錄媒體其他例的主要部分概略 剖面圖。 為本發月之光:貝訊記錄媒體其他例的主要部分概略 剖面圖。 圖5為本發明 < 光資訊記錄媒體其他例的溫度感應層的 光譜反射率特性光圖。 •、本發月之光資訊記錄媒體中具有光干涉效應之溫 度感應層的光譜反射率特性圖。 °為X在之光資訊記錄媒體中溫度感應膜的光譜反射 率特性圖。 84071-950420.doc 1307091 圖式代表符號說明 10 再生專用光資訊記錄媒體 11 入射光 12 透明基板 13, 13a, 13b 溫度感應膜 14 反射膜 15 保護層 16, 16a, 16b 記錄·再生層 20, 30, 40 記錄•再生用光資訊記錄媒體 84071-950420.doc -20-

Claims (1)

1307091 第092104661號專利申請案 秦 中文申請專利範圍替換本(97年9月~ 〜一—-} > y 拾、申請專利範圍： 吶年1月外曰修正本| 一—------------- ί 1. f種光資訊記錄媒體，其特徵在於其係於藉凹凸記錄資 Λ之基板上，自再生光入射側起，依序形成有含Ce02、 Zn0之任一者之溫度感應膜及反射膜而成者。 2. —種光資訊記錄媒體，其特徵在於其係於基板上，自再 生光入射側起，依序形成有含Ce〇2、Zn〇之任一者之溫 度感應膜、用以記錄資訊之有機色素膜及反射膜而成 者。 3. —種光資訊記錄媒體，其特徵在於其係於基板上，自再 生光入射侧起’依序形成有含Ce〇2、Zn◦之任一者之溫 度感應膜、介電質膜、用以記錄資訊之光磁膜、介電質 膜、反射膜而成者。 4. 一種光資訊記錄媒體，其特徵在於其係於基板上，自再 生光入射侧起，依序形成有含以…、Zn〇之任一者之溫 度感應膜'介電質膜'用以記錄資訊之相變化膜、介電 質膜、反射膜而成者。 5_如申請專利範圍第丨至4項中任一項之光資訊記錄媒φ 體，其中刖述溫度感應膜係由2層以上而成，層間進而 包含中間層而各層分離。 6. 如申請專利範圍第丨至4項中任一項之光資訊記錄媒、 體，其中前述溫度感應膜具有5〜9〇〇nm之厚度。 7. 如申請專利範圍第5項之光資訊記錄媒體，其中前述溫 度感應膜具有5〜900 nm之厚度。 8. —種光資訊記錄媒體之再生方法，其特徵係對於申請專 84071-970926.doc 1307091 利範圍第1至7項中任一項之光資訊記錄媒體照射光 =，以在溫度感應膜的光束光點内產生高溫部與低溫 部’於前述溫度感應膜的高溫部與低溫部可逆地改變反 射率及/或透光率’以依據從高反射率的溫度區域反射 的光’再生資訊。
84071-970926.doc Γ ^：· , ..........- mim 第092104661號專利申請案 中文圖式替換頁(95年4月）
常溫下的分光反射率 ο I 2 (％)1茶^采令
波長(nm); 圖 84071-950420.doc 13酬 柒、指定代表圖： )本案指定代表圖為：第（1 )圖。 )本代表圖之元件代表符號簡單說明： 10 再生專用光資訊記錄媒體 11 入射光 12 透明基板 13 溫度感應膜 14 反射膜 15 保護層 捌、本案若有化學式時，請揭示最能顯示發明特徵的化學式： 8407I-950420.doc
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