TWI223250B - Optical disc - Google Patents

Optical disc Download PDF

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Publication number
TWI223250B
TWI223250B TW090129995A TW90129995A TWI223250B TW I223250 B TWI223250 B TW I223250B TW 090129995 A TW090129995 A TW 090129995A TW 90129995 A TW90129995 A TW 90129995A TW I223250 B TWI223250 B TW I223250B
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TW
Taiwan
Prior art keywords
layer
recording layer
data recording
data
optical disc
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TW090129995A
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English (en)
Inventor
Sakuya Tamada
Hidetoshi Watanabe
Original Assignee
Sony Corp
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Publication of TWI223250B publication Critical patent/TWI223250B/zh

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    • 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
    • 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
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • 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
    • 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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    • G11B7/257—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
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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
    • G11B2007/25715—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
    • G11B7/252—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
    • G11B2007/25718—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
    • G11B7/242—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
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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
    • G11B7/242—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
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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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    • 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
    • G11B7/2475—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 merocyanine
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    • 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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    • G11B7/253—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
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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
    • 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
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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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    • G11B7/254—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
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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
    • G11B7/256—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

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Description

1223250 五 、發明説明（ 發明背景 1 ·發明範轉 本發明概有關於一種光碟，含 其中可透過該光導層對該資料記錄声施力If料記錄層， 且從該資料記錄層得以記錄並重製^料。〇先線，藉此而在 2 ·相關技藝說明 現已廣泛應用光碟。各片 射層等等，彼此互叠於其上。可4料；：：錄層、-反 記錄資料。而A^ 、 贫枓记錄層施加光線俾 -L 同先碟的記錄密度現已進行許多當巧， 精此在各片光碟上記錄下盡可能多的資料。 - :藉==種方式來增加資料記錄在光碟上的密度。 波長的雷射射束。第二，將且施加具有較短 ::)的物鏡裝設於記錄，重製裝置内。尤其是丄采= 氮化物+導體InGaN (氮化銦嫁）所組#，而發出具有波長 約400奈未L之雷射射束的半導體雷射，並且利用具有NA 為〇·8或更高的物鏡，藉此來增加光碟的容量。 膜 現眾知一種#次寫入光碟，即一種#統式可寫入光碟。 即如圖1所7F，该單次寫入光碟1〇〇含有一透明基板1〇1 ，具可如1.2毫米的厚度。可在該基板1〇1的主要表面上 劃出導溝1 0 2，提供作為信號記錄區域。在此，會於該信 號記錄區域上提供一資料記錄層1〇3，將反射膜1〇4構成 於該102導溝上，而又將一保護層1〇5疊放在該反射 1 0 4上。如此，該光碟丨〇 〇係屬多層者。 -4 - 本紙張尺度適财S S家標準(CNS) A4規格(21GX297公着） 1223250 A7 一__B7 五、發明説明（2 ) 為將資料記錄在該光碟1 0 〇上，由被安裝併入在一記錄 /重製裝置之内俾進行光學拾取的物鏡i丨〇所聚焦之雷射 射束111，會透過該基板101而施加在該導溝102上。該 負料1己錄層1 〇 3上的任一部份經照射以該雷射射束1 1 1即 會被加熱且變質。如此，即可在該資料記錄層1 〇 3上製作 出表示一資料信號的記錄坑孔（未以圖示）。 為從該資料記錄層1 〇 3讀出資料信號，會將具有低於用 以$己錄^料#號之射束強度的雷射射束1 1 1，施加於該信 號記錄區域上。可從該信號記錄區域所反射回的射束強度 ，偵測出是否出現或缺少該記錄坑孔。藉此產生表示著出 現或缺少記錄坑孔的重製信號。 即如上述，該單次寫入光碟100具有一厚度為12毫米 的基板101。該雷射射束1U會透過該基板1〇1而施加到 該資料記錄層1 0 3上。通常，會採用具有較高N A值的物 鏡以增加光碟的記錄密度。倘為如此，則如雷射射束所需 通過的光導層（即本單次寫入光碟丨〇 〇範例中的基板1 〇 i ) 其厚度愈厚，那麼該光導層的傾斜角就愈會影響到該射束 點的形狀。從而，實應減少該光導層的厚度俾按高記錄密 度將資料記錄於該光碟上。 為藉利用一高Ν Α值物鏡，並藉施加短波長雷射射束， 而達到高密度記錄作業，即已提出一款如圖2所示之可重 寫式光碟120。該可重寫式光碟12〇包含一基板121。可 在該基板1 2 1的主要表面上劃出導溝丨2 2，提供作為斤號 記錄區域。在此，會於該信號記錄區域上提供一資料記錄 -5- 本紙張尺度適用中國國家標準(CNS) A4規格(210X 297公釐) 裝 訂
1223250 A7 _ B7 五、發明説明（3 ) 層123，而將一光導層124疊放於該資料記錄層123上。 可透過該光導層124，將具有波長3 8〇到45〇奈米的藍光 雷射射束125施加於該資料記錄層123上。 該光導層124可由紫外線復合樹脂所製成。或另者，該 光導層1 2 4可為聚碳化物等材質之透明薄層，經黏著劑而 貼附於該資料記錄層1 2 3。如果所用物鏡具有〇·78以上的 ΝΑ值，該光導層124最好是為1〇到177微米（#m)厚度為 宜。 當透過此微薄的光導層124 ,而將雷射射束施加於該資 料記錄層1 2 3上時，即可按高密度將資料記錄在該可重寫 式光碟120上。這是因為該物鏡具有高1^入值，而所施用 的雷射射束具有短波長。 該可重窝式光碟1 2 0的資料記錄層可為相變記錄材料所 製成’像是Ge-Sb-Te 或 Ag-In-Sb-Te 者。 如此為按相變材料所製成，則該資料記錄層會具有高吸 收係數。因此，該資料記錄層無法實質上會獲得高反射率 。在將資料記錄於上之前，具有按相變材料所製成之資料 兄錄層的光碟需要展現出約1 5 %到2 5 %的反射率。有鏗 糸此，下一代的南在、度光碟確應予標準化以展現低反射率 然而，近年來對於價廉且具備按有機材料所製成的記錄 層之單次寫入光碟的需求快速升高^現已利用有機材料而 發展成為光碟’對此可施加藍光雷射射束以記錄並重製資 料。 張尺度適财_冢標準(CNS) A4規格(21G X 297公爱) V1223250 A7 B7 五、發明説明（4
即如前述，該可重寫式光碟1 2 0在將資料記錄於上前， 需要展現出約1 5 %到2 5 %的反射率（後文中稱之為，，初始 反射率”）。最好是希望施以藍光雷射射束的單次寫入光碟 亦應該具有1 5 %到2 5 %的初始反射率。如果資料記錄声 的有機材料具有2 · 3或更南的折射率η，則該光碟確可取得 1 5 %到2 5 %的初始反射率，此可參如「日本專利申請案 」第2000-086687號所述。 然欲具有2.3或更高的折射率且可因而作為資料記錄層 的材料者，實僅存在數種材料確屬可用。有些有機材料確 具有2 ·3或更高的折射率。但是彼等不足以承受熱度或氣 候，無法展現適合於藍光雷射射束波長的吸收頻譜。且這 些亦無足夠的非晶質性以抑除雜訊。 茲考慮到單次寫入光碟的製作成本及大量生產性，因此 希望是藉施加一黏著劑而將光導層接附於該有機材料的資 料記錄層。然而，假使將光導層接附於該資料記錄層，則 該有機材料或將擴散到該黏著劑中或與該黏著劑相互反應 。因此該資料記錄層會出現劣化。這或許是因為該有機材 料溶解滲入該黏著劑内所含有的溶劑中，像是乙酸聚合物 。從而，會要求將該介電部分構成在該資料記錄層上，藉 此防止該黏著劑擴散滲入該資料記錄層内。 該資料元錄層可按折射率為低於2·3的有機材料所製成 。在此情況下，即可增加選擇該材料的機會。不過，即無 法要求該光碟獲得15%到2 5%的初始反射率。為將該光 碟的初始反射率提高成15%到2 5%，可令該介電部分構 裝 訂
A7 — —— __B7 五、發明説5~)两 --一 成在边 > 料冗錄層上而產生多重干涉，以獲得光學增強效 果為達到光學增強效果，該介電部分應採具有儘可能低 折射率之材料所製成。 、Z如前述，介電部分必須被構成在該資料記錄層上，且 =資料記錄層必須具有儘可能低的折射率，如此有機會獲 知儘可能高的密度。無論該資料記錄層究係按具有至少為 2·3的折射率，或者是按折射率低於2.3的有機材料所製成 ，這點都會是事實。 具有低折射率的材料範例可如像是Ma]p2的氟化物，以 及如si〇2的氧化物。這些材料的薄膜可藉rf_電漿濺鍍 所構j。或另者，可按氣相沉積作業來構成該MgF2薄膜 ，而藉電子射束氣相沉積來構成該Si〇2薄膜。但是，假使 採取這些方法來構成該MgF2或Si〇2的介電部分，就無法快 速地構成出該等介電部分。因而，無法依所欲方式而有效 率地大量製作光碟。上述標示之方法幾乎無法提供具有所 欲組成成分的介電部分？亦即，如此所構成的介電部分會 展現出不足夠的透明性與不適當的表面平滑度。 可進行利用矽質靶材及氧質電漿的反應性濺鍍來構成一 Si〇2薄膜。本方法可確實地依足夠高速方式來構成出以〇2 薄膜。但是，所採用的有機基板會因構成該si02薄膜之處 理程序過程中所產生的氧質電漿而致變質。這會無可避免 地劣化該資料記錄層3。 為此上述原因，因而不易直接地在該資料記錄層上構成 出像是MaF2的氟化物薄膜，或是如以〇2的氧化物薄膜。 -8- 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐) 發明簡單說明 本發明係針對前揭各項而設。本發明之一目的在於提供 光碟’其中T透過光導層而將光線施加於該資料記錄層上 ’俾以對及從該資料記錄層記錄且重製資料。如此組態設 计孩光碟，使得雖係以黏著劑將該光導層貼附於該者，該 資料記錄層並不致劣化。 欠根據本發明之光碟含有一基板、一按有機材料所製成之 貝料記錄層、一供置於該資料記錄層上之介電部分，以及 一供置於孩介電部分上之光導層。可藉由透過該光導層而 將雷射射束施加於該資料記錄層，來對/從該資料記錄層 e錄且重製資料。該介電部分含有接觸於該資料記錄層的 氮化物層，與疊附於該氮化物層之上的氧化物層或氟化物 層。該氮化物層具有最多10奈米的厚度。 在本發明之碟片裡，該介電部分係構成於該資料記錄層 上。因此，該資料記錄層絕不會接觸到將該光導層貼附到 該介電部分的黏著劑。這可防止該資料記錄層的有機材料 出現劣化情況。 、在根據本發明之光碟中，該介電部分含有一氮化物層， T及在該氮化物層上的氧化物層或氟化物層。如此，即使 是如以^應濺鍍來構成該氧化物層，在反應濺鍍過程中所 產生的氧質電漿也不會劣化該資料記錄層的有機材料。 :本發明之光碟裡，該氮化物層具有10奈米或更薄的 =，，即便是其高折射率，該氮化物薄膜也並不會 妨礙到光學龍效果H㈣記錄於其上之前，該 五、發明説明（7 ) 可具有足夠的反射率。 在根據本發明之光碟中，會在該氮化物層上構成氧化物 層或氟化物層，各者具有低折射率。因此，該光碟可因多 重干涉而獲得光學強化效果，且在將資料記錄於其上之前 確可展現出足夠高的反射率。此外，該介電部分可具有適 當的機械強度。 在根據本發明之光碟中，該介電部分係經供置於該資料 己錄層上且光導層係以黏著劑而貼附於該介電部分上 。因此，該黏著劑不會接觸到該資料記錄層。該資料記錄 層的有機材料不會擴散到黏著劑而致劣化該資料記錄層。 在根據本發明之光碟中，會在資料記錄層上構成一氮化 物層，而於該氮化物層上供置氧化物層或氟化物層。因此 ，在按反應濺鍍以構成該氧化物層的處理程序中所產生的 氧質電漿，並不會劣化該資料記錄層的有機材料。此外， 由於可藉由反應濺鍍方式來構成該介電部分，因此該光碟 可極適合於大量生產。 在根據本發明之光碟中，供置於該氮化物層上的氧化物 層具有低折射率。因此該光碟可達到光學強化效果。此外 由杰3氣化物層僅具1 0奈米或更薄的厚度，因此即便 是其高折射率，該氮化物薄膜也並不會妨礙到光學強化效 果。在光碟錄存資料之後所獲得的光碟反射率，與該者在 錄存資料之前所呈現的反射率會有極大差異性。這可授予 光碟良好的信號-記錄/重製特徵。 圖式簡單說明 1223250 A7 B7 五、發明説明（8 圖1為傳統式光碟的截面圖； 圖2為單次寫入光碟，對其施以一藍光雷射射束以對及 自該光碟記錄並重製資料； 圖3為根據本發明之光碟的截面圖； 圖4為解釋當光導層經黏著劑而貼附於資料記錄層時， 该；貝料s己錄層反射率與傳通性將如何改變之圖式，· 圖5為解釋當於資料記綠層上供置-Si〇2薄膜時，該資 料記錄層反射率與傳通性將如何改變之圖式； 圖6為解釋當於資料記錄層上供置一聊4薄膜時’該資 料記錄層反射率與傳通性將如何改變之圖式； 裝 圖7為解釋當按所述順序於資料記身層上構成薄膜 與Sl〇2薄膜，而-光導層係經黏著劑而貼附於該薄膜 上時，該資料記錄層反射率與傳通性將如何改變之圖式； 訂. 圖8為表示當資料記錄層上並無構成Si3N4薄膜，且一 先導層係經黏著劑而貼附於該資料記錄 層之厚度、折射率及反射率間的關係圖； 枓己錄 為/示，Λ在資料記錄層上構成具厚度10奈米之 線 :時二資料且二^導層係經黏著劑而貼附於該叫队薄膜 ; 枓§己錄層之厚度、折射率及反射率間的關係圖 siT二表：’當在資料記綠層上構成具厚度20奈米之 bi；jN4 厚膜’且^ λ- ^.1 上時，該資料尨锊展、 耆劑而貼附於該Si队薄膜 •丄科6己錄層〈厚度、折射率及反射率間的關係圖 -11 - 1223250 A7 ---------^ 五、發明説明（9 )
Si = 資料記錄層上構成具厚度30奈米之 且-光導層係經黏著劑而貼料該心薄膜 寺’孩'貝料記錄層之厚度、折射率及反射率間的關係圖 Ο 發明詳細說明 現將參酌於隨附圖式，以詳細說明根據本發明之光碟。 即如圖3所示，該光❾含有一基板2、一資料記錄層3 、一介電部分4和-光導層5。„料記錄層3係叠附於該 基板2上。孩介電部分4係疊附於該資料記錄層3上。而該 光導層5係按黏著劑而貼附於該介電部分4上。 當具有波長380到450奈米的雷射射束6穿過該光導層5 而施加於該資料記錄層3上時，一資料信號會被記錄在曰該 光碟1上且可由此重製之。該光碟在將資料記錄於上前為 約1 5 %到2 5 %的反射率（後文中稱之為，，初始反射率”）。 該者符合下代、高密度光碟的標準，即應展現於記錄後為 0 %到1 0 %的反射率。 該基板2係一具有厚度為丨.2毫米的碟片。可按如多元碳 酸樹脂、非晶質聚婦烴樹脂等等所製成。 該資料記錄層3係供置以記錄信號。此者係由有機材料 所製成。該有機材料可改變其反射率以記錄資料信號。可 將有機染劑溶解於四氟代丙醇（tetrafluoropropanol)内而備 置其溶液，藉此來鍍層該基板2以構成出該資料記錄層3 。該有機染劑的範例可如花青甘基染劑、部花音甘基染劑 、紫菜鹼染劑、吡喃鏘基染劑、莕喹啉基染劑、蒽喳啉基 -12· 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐) 1223250 A7 B7 五、發明説明（ 染劑、靛酚基染劑等等。 琢光導層5可由如多元碳酸樹脂所製成。該光導層$可 保護該資料記錄層3並讓通從—記錄/重製裝置處所施加的 光線。忒光線會穿透該光導層5而施加於該資料記錄層3 上。 /孩介電部分4係由一氮化物層7及一氧化物層8所組成， 彼此疊覆其上。該氮化物層7係按如si3N4、剔等所製成 。該氧化物層8係按如Si〇2等所製成。可利用氟化物層來 取代薇氧化物層8。該氟化物層可為MgF2等所構成。 —由於孩介電部分4係供置於該資料記錄層3上，因此黏 著劑並不會接觸到該資料記錄層3。該資料記錄層3的有 機材料不會擴散到該黏著劑内或與之反應，並且完 出現劣化。 取好是时電部分4係由具有低折射率的材料所構成。 後文中將詳述其原因。 二如前示，該光^需要具有15%到25%的初始反射率 古耩以符合下代、高密度光碟的標準。如果該有機材料具 有=更⑥的折射率，料就可獲得15%到25% 反射率。 率：：機吏該資料記錄層3是由具有2.3或更高的折射 機材科所構成，則該資料記錄層3幾乎無法承受埶 度或歧，且不能展現適於藍光雷射射束波長的吸收頻譜 斫典足夠的非晶質性以抑除雜訊。 ’ 4电部分4可由具有低折射率的材料所構成。而在此 -13 - 本紙張尺度適財a a家標準(CNS) A4規格(210 X 297公董7" 裝 訂· 1223250 A7 __ B7 五、發明説明（彳彳) 情況下，會出現多重干涉，產生一光學強化效果。從而， 倘該資料記錄層3是由具有低於2.3的折射率之有機材料所 構成’則該光碟1也將會具備1 5 %到2 5 %的初始反射率。 具有低折射率的材料範例可如像是Si〇2的氧化物，以及 如MgF2的氟化物。Si〇2及Mgh的薄膜可藉氣相沉積、電 子射束氣相沉積、RF -電漿濺鍍等方式構成。不過，有 鐘於該介電部分4所要求的大量製造與透明性之故，因此 最好是該介電部分4是藉由反應濺鍍方式構成為宜。 該光碟1的介電部分4含有氮化物層7及氧化物層8。該 氮化物層7構成於該資料記錄層3上，而該氧化物層8構成 於該氮化物層7上。因此，可利用氧質電漿，藉由反應濺 鍍方式構成該氧化物層g。這是因為在構成該氧化物層8 之反應濺鍍過程中所產生的氧質電漿，並不會劣化該資料 記錄層3的有機材料。 即如前文所標定，該介電部分4係一由氮化物層7及氧 化物層8所組成之雙層式元件，而該光導層5係藉黏著劑 而貼附於该介電部分4上。這些結構特性確可防止該資料 記錄層3的劣化問題，即如後文裡參酌於圖4至7所詳述。 該等圖式4至7中所繪箭頭係表示施加於該光碟丨之光線反 射與通透。 現已產製出第一比較碟片。即如圖4所示，該碟片含有 一多元碳酸物基板1〇、一資料記錄層u、一黏著劑層12 及一多元碳酸物薄膜13。該資料記錄層n厚度為8〇奈米 ，並係供置於該基板10之上。該黏著劑層12可將該多元 -14- ^紙張尺度適用中國國家標準(CNS) A4規格(210X 297公爱)-----一 — 12 五、發明説明（ 碳酸物薄膜13貼附於該資料記錄層u。將一雷射射束施 加於該第-比較碟片上’或更確切為料多元碳酸物薄膜 13之上。可依照從該碟片處反射回的射束強度，測量出 孩第-比較碟片的反射率及透射率。其結果可如下之表i 〇 表1 反射牟^7 測得值 9 理論值 --·~----- 10 透射率（％) 70 --—.—— 64 ---- 吸收係數 - 2.0 折射率 而主 1 ·»· 一 0.1 倒數 1.7 0.1 值 ,,” V ^'4 -T~ 百 ^ 但該碟片的反射率則近乎相等於其理論值顯出 該資料記錄層W依據折射率及吸收絲而改變了換^ 2，这意味著該資料記錄層11會因其材料擴散進入該黏 耆劑1 2之故而劣化。 泛資料口己錄層1 1的折射率與吸收係數是從該第一比較 碟片的透射率及反射率所計算而得。其結果亦如^所示 。顯，地，孩層1 i的折射率與吸收係數會不同於其理論 值。這表示該資料記錄層丨丨並未退化。 β 現已產製出一第二比較碟片。即如圖5所示，該碟片本 有-多元碳酸物基板20、一資料記錄層21及一si〇2薄： 2卜該資料記錄層21厚度為1〇〇奈米，並係供置於該多 -碳酸物基板20之上。該叫薄膜22厚度為4〇奈米並 -15- 297公釐) 本紙張尺歧财@ S家標準
係供置於該資料記錄層2 i之卜.. 第二比較碟片上’或更確切為於該S:二=力： 照從該碟片處反射回的射束強产， 2〈上。可依 的反射率及透射率。其結果可：下=該第二比較碟片 表2
b即如表2所列示，第二 ι商於其理論值。這表示該資料記錄層21會因構成續㈣ 薄膜22<過程中所產生的氧質電衆，或是因該資錄 層21的反射率與吸收係數改變而出現劣化。 -, =資料記錄層21的折射率與吸收係數是從該第二比較 環片的透射率及反射率所計算而得。而其結果亦如表 不。顯然地，該層21的折射率與吸收係數確實不同於 理論值。這表示該資料記錄層2丨並未退化。 、、 =產製出-根據本發明之第一光碟。即如圖6所示， “光媒含有-多TG碳酸物基板3()、-資料記錄層3卜—
Si3N4層3 2及一 Si02層3 3。每资祖々技a， 曰 2曰 忑貧枓5己錄層3 1厚度為丨〇〇奈 米，並係供置於該基板30之上。該叫队層”厚度為5 米，並係供置於該資料記錄層3 !之上。該叫層33厚度 為3 5奈米，並係供置於該轧队層3 2之上。將—雷射射^ -16- 本紙張尺度咖中國國家標準(CNS) M規格(21〇x 297公爱)'~ ------- 1223250
施加於該第一光碟上，或更確切為於該以〇2層3 3之上。可 依照從該碟片處反射回的射束強度，測量出該第一光碟的 反射率及透射率。其結果可如下之表3。 表3 測得值 理論值 倒數 反射率（％) 5 4 _ 透射率（％) 65 6 2 _ 吸收係數 - 2.0 折射率 - 0.1 - 即如表3所列π，第一光碟的反射率及透射率兩者幾乎 等於其理論值。如此表示該資料記錄層3丨完全沒有劣化 可從該表3知悉，該資料記錄層3丨在根據本發明之光碟 中並無退化現象。此外，即如圖7所示，一多元碳酸物薄 膜3 5係經一黏著劑層3 4而貼附於該Si〇2層3 3處，如此產 生出-根據本發明之第二光碟。將一雷射射束施加於該第 二光碟上，或更確切為於該多元碳酸物薄膜35上。可依 照從該碟片處反射回的射束強度，測量出本款光碟的反射 率及透射率。其結果可如下之表4。 表4 測得值 -----_ 理論值 倒數 反射率（％) 9.5 10 透射率（％) 64 64 一 __-17- I紙張尺度適财國國家標準(CNS) A4規格(210X 297公f) 15 1223250 15 1223250 五 發明説明（ 折射率 #即如表4所列示，第二光碟的反射率及透射率兩者幾乎 寺於其理雨值。如此，第二光碟的資料記 沒有劣化。 I疋王 根據如上產製且測試的這四種碟片所測獲之透射率及反 射率，即可發現如滿足兩項要求，則確可防 層3出現劣化問題。首I該介電部分4必須含有= 物層7及一氧化物層8。其次，該光導層5應該以黏著劑而 貼附於該介電部分4處。 ，在根據本發明之光碟i中，該介電部分4係構成於該資 料。己錄層3上’而該光導層5是以黏著劑而貼附於該介電 部分4處。因&，該資料記錄層3與該黏著劑層絕不會相 訂. 互接觸。該資料記錄層3的有機材科將不會擴散到該黏著 劑層内。而該者也不會與該黏著劑相互反應，從而導致劣 化該資料記錄層3 ^ 在根據本發明之光碟14里，該氮化物層7係構成於該資 料記錄層3上，而該氧化物層8構成於該氮化物層7上❶這 可防止該資料記錄層3的有機材料被為構成該氧化物層8 而執行之濺鍍作業過程中產生的氧質電漿所劣化。 通常’氮化物會具有大的折射率。為降低該介電部分4 的折射率，會要求該氮化物層7為足夠地薄。更詳細地說 ，該氮化物層7的厚度應為10奈米或更薄。如果該氮化物 層7具有多於10奈米的厚度，則該光碟i就無法獲得15% -18- 本紙張尺度適用中國國家標準(CNS) A4規k(2l〇x 297公爱Γ 16 五、發明説明（ 到25%的初始反射率。現將解釋為何該氮化物層7的厚产 應為10奈米或更薄。 & 現已導衍模擬作業已決定由該資料記錄層3及該介電部 分4所組成之結構的反射率，究係如何地隨著該資料記錄 層3的田厚纟及折射率而改變，i最終#出該氮化物層了厚 j =取佳數值。圖8到丨丨顯示該模擬結果。該圖8為表示 f資料記錄層3上並無構成SisN4薄膜時，該資料記錄層之 厚度折射率及反射率間的關係圖。該圖9、丨〇和丨丨為表 不當在資料記錄層3上構成具厚度1〇奈米、2〇奈米與3〇 奈米之SisN4薄膜時，其厚度、折射率及反射率間的關係。 假設該資料ί己錄層3係由所這種要求在記錄資料前折射 率為2.2，而在記錄資料後折射率成為17的材料製成。那 麼，折射率的變化愈大，該光碟丨所能展現的信號-重製 特徵亦愈佳。 即如圖9所示，如果該卟队薄膜的厚度為1〇奈米，那麼 該雙層結構之折射率的變化程度，會幾乎與在該資料記錄 層3上並無構成SisN4薄膜的情況相同。假使該資料記錄層 3為例如40奈米厚度，那麼倘該折射率係2·2則其反射率 為10到15%，且若該折射率係17則其反射率為〇到5%。 即如圖1 0所示’如果該礼队薄膜的厚度為2〇奈米，那 麼該雙層結構之折射率的變化程度，會低於在該資料記錄 層3上並無構成Si;N4薄膜的情況。假使該資料記錄層3為 例如40奈米厚度，那麼倘該折射率係2·2則其反射率為$ 到1 0 %，且若該折射率係！ 7則其反射率為〇到5 %。 1223250 五、發明説明（17 ) 那Γ如圖11所不’如果該Si3N4薄膜的厚度亦為3〇奈米， 制結構之折料的變化程度，會低於在該資料記 錄層3上並播構成si; n4薄膜的情況。彳▲、， 丹朕妁b况假使孩資料記錄層3 為例如40奈米厚度，那麼倘該折射率係2·2則其反射率為 5 = 10%，且若該折射率係17則其反射率為〇到5%。 從上文可知，如果該氮化物層7的厚度為低於10奈米， 即使在構成該氧化物層8的處理程序過程中產生氧質電漿 ，亦可防止孩資料記錄層3不致出現劣化。在此情況下， 該光碟1可獲得1〇%到15%的初始反射率。 如該介電部分4係僅由厚度1〇奈米或更薄的氮化物層了 所組成，則會具有然卻顯不足的機械強度。事實上，該介 電部分4=僅含有該氮化物層7，亦包含構成於該氮化乂物 層7上的氧化物層8。因而該介電部分4會具有足夠的機械 強度。 即如前示，在根據本發明之光碟1裡，該介電部分4是 構成於該資料記錄層3上，而該光導層5係以黏著劑貼附 杰該；1电部分4上。如是，該資料記錄層3絕不會接觸到 將該黏著劑。該資料記錄層3的有機材料不會擴散到該黏 著劑内或與之反應。故該資料記錄層3不會出現劣化情況 在根據本發明之光碟丨裡，該氧化物層8係構成於該氮 化物層7上，而該光導層5係構成於該氧化物層8上。因此 ’在利用濺鍍方式來構成該氧化物層8的處理過程中所產 生的氧質電漿，並不會劣化該資料記錄層3的有機材料。 -20 本紙張尺度適用中國國家標準(CNS) Α4規格(210 X 297公釐） 訂' 緣 1223250
此外，由於可藉反應濺鍍方式構成該介電部分4，因此該 光碟1極適合於大量製造。 正如前述，供置於該氮化物層7上的該氧化物層8具有 低折射率。因&，藉由按多重干涉所產生之光學強化效果 明的光碟！可獲得15%到25%的初始反射率，即使 1> 料记錄層3是由具2.3或更低之折射率的有機材料所 製作亦然。此外，即便是其高折射率，該氮化物薄膜7也 並不會妨礙到光學強化效果，因為其厚度僅1〇奈米或更 薄。該光碟1在將資料記錄於其上之後所獲得的反射率， 會與在將資料記錄於其上之前的反射率間產生極大差異。 這可提咼C/N (信號雜訊）比。如此，該光碟1可具有所欲 之信號-重製特徵。 即如如述，在根據本發明之光碟1裡，該光導層5係經 黏著劑而貼附於該介電部分4處。而亦有鑑於此，該光碟 亦極適合於大量生產。因此可按極低成本來製作該光碟1 〇 根據本發明，該氮化物層7與該氧化物層8可分別由 SisN4和Si〇2所製成。換言之，該層7與層8兩者可按相當 廉價的矽基材料而製造。這有助於降低該光碟1的製造成 本。 該層7與層8最好是分別按相同元素的氮化物及氧化物 ，即如SIN4和Si〇2而製造較佳。如是，該氮化物層7及該 氧化物層8可按前述順序而連續地構成，在構成出該氮化 物層7後僅以氧氣來置換氮氣即可。 -21 - 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐）
1223250 A7 B7 五、發明説明（19 範例 一光碟係根據本發明所製作，且其初始反射率與信號一 重製特徵係經決定，即如後文所詳述。 首先’藉由射出鑄模方式製作出厚度為1.2毫米的多元 碳酸基板。 其次’以一溶液並藉自旋鍍層作業來對該多元碳酸基板 進行鏡層’而該溶液係將花青甘基光敏性有機染劑溶解於 四氟代丙醇内所備製而成。一厚度約4〇奈米之鍍層於是 形成於該多元碳酸物基板之上。 藉利用一矽質靶材、氬氣（Ar)和氮氣（NO，對該產出結 構進行射頻（RF)濺鍍作業，而構成出一透明si3N4薄膜， 其厚度為5奈米。所用之氬氣和氮氣量分別為32 seem與8 seem。總氣壓為3 mTorr，而該RF功率為60 mW。 然後’將該氮氣更換為氧氣（〇2)，並執行反應濺鍍作 業。如此構成一具有厚度為25奈米的Si02薄膜。在這項過 程中’所用之氬氣和氧氣量分別為16 seem與4 seem。總氣 壓為1.5mTorr，而該RF功率為50mW。 最後，可鍍製出約100微米（#m)厚度的多元碳酸薄層， 並藉加壓除沫方法來黏著且壓實（press-boned)該Si〇2薄膜 〇 前已利用含有405奈米射束的雷射以及具有0.85 NA值 的物鏡之裝置，來測試按本法所製作之光碟的信號-重製 特徵。當將資料按〇 · 4微米標號之形式而記錄在該光碟上 時，該光碟可展現1 5 %的初始反射率，5 m/s的線性速度和 -22- 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐) 1223250 A7 B7 五、發明説明（2〇 ) 50 dB或更高的C/N比。 即如由測試結果得知，根據本發明的光碟可具有初 1 5 %到2 5 %的初始反射率，可按超過50 dB的高C /N比來 記錄信號，並因此確可展現良好信號-重製特徵。 本發明並不限於前述範例。且自可著手於各種變化與修 改，而無虞悖離本發明範圍與精神。 -23- 本紙張尺度適用中國國家標準(CNS) A4規格(210X 297公釐)

Claims (1)

  1. I22323U
    1 · 種光碟，其包含： 一基板； 一由有機材料所製成之資料記錄層； —介電部分；以及 ㈢’ 一光導層， :中係藉通透於該光導層施加—雷射射束於該資料 :錄層以記錄資料’該介電部分含有一接觸於該資料 二己錄層的氮化物層’且一氧化物層或一氟化物層係叠 β於孩氮化物層上’且該氮化物層具有最多10奈 厚度。 2.如申請專利範圍第η之光碟，其中係藉由對該資❸己 錄層施加一具有波長為38〇奈米到45〇奈米之雷射射束 ，來記錄及重製該等資料信號，且對具有該波長之射 束’在s己錄資料之前其反射率為丨5 %到2 5 %，而在^己 錄資料之後其反射率為〇 %到1 〇 %。
    本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐）
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US20020122379A1 (en) 2002-09-05
MY136918A (en) 2008-11-28
JP2002175645A (ja) 2002-06-21
KR100849834B1 (ko) 2008-08-01

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