TW200402049A - Optical data storage medium - Google Patents

Optical data storage medium Download PDF

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TW200402049A
TW200402049A TW092107517A TW92107517A TW200402049A TW 200402049 A TW200402049 A TW 200402049A TW 092107517 A TW092107517 A TW 092107517A TW 92107517 A TW92107517 A TW 92107517A TW 200402049 A TW200402049 A TW 200402049A
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layer
recording
plastic
stack
data storage
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TW092107517A
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Ronald Joseph Antonius Van Den Oetelaar
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Koninkl Philips Electronics Nv
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242Record 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
    • G11B7/243Record 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 inorganic materials only, e.g. ablative layers
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2403Layers; Shape, structure or physical properties thereof
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2403Layers; Shape, structure or physical properties thereof
    • G11B7/24035Recording layers
    • G11B7/24038Multiple laminated recording layers
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242Record 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
    • G11B7/244Record 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
    • G11B7/246Record 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
    • G11B7/247Record 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
    • G11B7/2472Record 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/253Record 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
    • G11B7/2533Record 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
    • G11B7/2534Record 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]
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/254Record 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
    • G11B7/2542Record 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/257Record 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/258Record 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
    • G11B7/259Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers based on silver

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

Description

200402049 玖、發明說明: 【發明所屬之技術領域】 本發明係關於一種借助一聚焦輻射光束進行記錄的光學 資料儲存媒體,聚焦輻射光束經可透射該輻射光束的第一 塑膠/樹脂層進入媒體,該媒體至少一步包括: -一包含第一記錄層的第一記錄堆疊,其位置緊鄰該第一 塑膠/樹脂層, -一包含第二記錄層的第二記錄堆疊,該第二記錄堆疊所 處位置距離該第一塑膠/樹脂層比該第一記錄堆疊更遠, -介於該第一與該第二記錄堆疊之間的一透明間隔層,其 厚度大於該聚焦輕射光束的聚焦深度。 序言中所述的光學記錄媒體之一項具體實施例可從日本 專利申請案JP-1 1 066622中獲知。 【先前技術】 與普通光碟(Compact Disc ; CD)相比,數位多功能光碟 (Digital Versatile Disk ; DVD)的資料儲存容量高得多,因 而近來在媒體市場也佔有一席之地。目前,該媒體格式有 唯讀(read only ; ROM)、可錄(recordable ; R)及可擦寫 (rewritable ; RW)幾種形式。其中可錄及可擦寫式DVD有幾 種具有競爭力的格式:可錄式為DVD+R與DVD-R,可擦寫 式為DVD + RW、DVD-RW及DVD-RAM。由於可錄式與可擦 寫式DVD格式中僅存在單堆疊媒體,最大容量為4.7 GB, 故二者的問題皆為容量有限,因而記錄時間有限。注意DVD 影音光碟為唯讀光碟,係容量8.5 GB的雙層媒體,常稱為 84630 200402049 DVD-9,也佔有相當的市場份額。因此,非常需要容量為8.5 GB的可錄式與可擦寫式DVD格式媒體。雙層(即雙堆疊)可 錄式及/或可彳祭寫式DVD光碟或許較為適宜。DVD-ROM標 率規格中說明了單堆疊光碟(A型,資料容量gb)及雙 堆璺光碟(c型,資料容量=8·5 GB)。此外,還說明了雙面 式單堆®光碟(B型,資料容量=9·4 GB)及雙面式雙堆疊光 碟(D型’貝料容量= 17〇GB)。因而非常需要可與dvd-R〇m 標皁相容的可錄式(即單寫式)及/或可擦寫式媒體。最近又 引進了一種儲存容量更高稱作藍光光碟(Blu_ray Disc ; bd) 的新型媒體格式。該系統採用的輻射光束波長約4〇5 , 且聚焦輻射光束的數值孔徑(numerical aperture ; NA)很高。 同樣也了引入该格式的單寫(write 〇nce ; r)與可擦寫(RW) 形式,而且可考慮其雙層BD形式。 库田射光束為了接近第二記錄堆疊,也稱作雙層DVd+r二 雙層DVD+R+RW或雙層DVD+R-R〇M光學儲存媒體的u記 錄堆疊(見圖1中數字4),必須穿過三層聚焦在L1堆疊的記 錄層上,即上部聚碳酸酯基板、第一記錄堆疊(也稱L〇記錄 堆疊)及間隔層(分別見圖i中的數字1、2及3)。該三層中任 一層之介面内或介面上的光學干擾對光學記錄信號非常不 利,甚至會阻礙L1層上的讀或寫操作。已知媒體中,在 上寫操作期間,L0染料層吸收的熱量會引起基板與染料介 面附近的聚碳酸酯中產生應力,因而引起上部基板(其為第 一塑膠或樹脂層)中的應力雙折射,也稱作機械雙折射或光 彈性(photoelasticity)。上部聚碳酸酯基板中所引起的雙折 84630 200402049 射可也會阻止在下部L1層上獲得足夠小的聚焦雷射點,反 過來也會影響L1層所反射的雷射光束。 雙層媒體中輻射光束聚焦在L1層上時,未聚焦於受影響 的(具有應力雙折射)聚碳酸酯區域,而與之相比,對於單堆 疊DVD+R媒體及類似的CD_R媒體,由於基板與染料介面上 聚碳酸酯中所引起的應力雙折射靠近輻射光束聚焦點,故 受上述問題的影響很小。 【發明内容】 本發明的一項目的係提供一種序言中所述類型的光學資 料儲存媒體,其第一塑膠/樹脂層不會或幾乎不會受到輻射 光束所引起的應力雙折射。 藉由序言中所述的一光學儲存媒體可實現本目的,其特 徵在於第一透光熱阻障層係置於第一記錄堆疊與第一塑膠/ 樹脂層之間。 — 故建議在單面及雙面雙層DVD+R、DVD+R+RW及 DVD+R-ROM光學儲存媒體中,採用介於第一記錄堆疊(即 上部L 0可錄式堆疊)與第一塑膠/樹脂層(如上部聚碳酸酯基 板)之間的第一熱阻障層。熱阻障層會消除因上部L〇層中的 寫操作而在上部聚碳酸酯基板中產生的應力雙折射,因此 允許光以最適宜的方式接近下部L1層。 第一記錄層最好為單寫層,第二記錄層為 可擦寫式層及唯讀層中之—,。後者在製自造=碟 (maSterdisk)期間錄入。該單寫層的優點為第一記錄堆疊可 達到很高的透射率。該高透射率使光學儲存媒體之第一與 84630 200402049 第二記錄堆#的有效光反射皆高於1δ%,其為则唯讀標 準的要求之一。 層的材料為(例如)ZnS_Si〇2、矽氧氮化物及氧化矽。 第一熱阻障層最好由-低導熱(如小μ w/mK)材料製 成。該材料應可透射輕射光束,即在聚焦輻射光束之波長 為;w如對於爾,又=655 nm)時,光吸收參數以為零或 接近於零(如<<0.01)。最好該材料的機械應力較低,且足夠 厚,較佳在⑴⑻·的範圍内,最佳介於5至5〇腿之間, 從而降低熱阻障層與基板之間介面的溫度,以防止(如聚礙 酸酯材料所制)第一塑膠/樹脂層的機械變形。適用作熱阻障 熱阻障層也有助於增大上部L0堆疊的記錄敏感度。由於 要使^夠的輻射光束達到下部1^1堆疊’ “堆疊的透射率必 2很高,故在L0堆疊上記錄時,應有效利用輻射光束的能 量。熱P且障層會;咸少漏失至上部塑膠/樹脂基板的熱量,在 而使L0可錄式堆疊更敏感。 在另項具體實施例中,光學資料儲存媒體進一步包括: 可透射%射光束的第二塑膠/樹脂層,其與第一塑膠/樹 脂層相對, 一包含第三記錄層的第三記錄堆疊,其位置緊鄰第二塑 膠/樹脂層, 一包含第四記錄層的第四記錄堆疊,該第四記錄堆疊所 處位置距離第二塑膠/樹脂層比第三記錄堆疊更遠, 介於第二與第四記錄堆疊之間的一透明間隔層,其厚度 大於聚焦輻射光束的聚焦深度, 84630 -10- 200402049 _ 一第二透光熱阻障層,其置於第三記錄堆疊與第二塑膠/ 樹脂層之間。依此方式,即可實現雙面光學記錄媒體, 其資料儲存容量為單面媒體的兩倍。 【實施方式】 比較範例(先前技術): 圖1中顯示依據先前技術的一光學資料儲存媒體1〇,其借 助聚焦輻射光束9進行記錄。輻射光束9的波長為655 nm, 其經由聚碳酸酯製成、可透射該輻射光束9的第一塑膠/樹 脂層1進入媒體10。該媒體進一步包括:含有第一記錄層的 第一記錄堆疊2,其位置緊鄰第一塑膠/樹脂層,及含有第 二記錄層的第二記錄堆疊,該第二記錄堆疊4所處位置距離 第一塑膠/樹脂層1比第一記錄堆疊更遠。位於第一與第二 記錄堆疊之間有一透明間隔層3,其厚度介於4〇至7〇 之 間,大於聚焦輻射光束的聚焦深度。第一與第二記錄層為 偶氮染料(azo dye)層。第一與第二記錄堆疊進一步包括反 射層,分別為(例如)10 nm的半透明金屬Ag薄層,及很厚的 100 nm金屬Ag層。 範例(依據本發明): 圖2中顯示依據本發明的光學資料錯存媒體2〇,其中置於 第-記錄堆叠2與第一塑膠 層bl,加在圖i所述的光學資料儲存媒體⑺上。熱阻障層w 王要=括SiQ2 ’厚度為2。,係藉由(例如)噴錢法沈積而 成第冑膠/樹脂層丄為聚碳酸醋製成的基板,具有飼服 預製凹軌圖案,厚度範圍為55〇至6 84630 -11- 200402049 於在錄入及/或讀取期間,導引聚焦輻射光束9。第一記錄 堆疊2為單窝堆疊,其包括由一花青染料(巧奶丨^办幻或偶 氮染料(η=2·2、k=〇.〇2)所製成的第一記錄層,其厚度為8〇 nm。染料可利用旋塗或蒸發方法進行沈積。厚度為8 nm的 半透明反射Au(n=0.28、k=3 ·9)層位於第一記錄層與間隔層3 之間,且係利用(例如)噴濺方法沈積而成。透明間隔層3由 紫外光硬化樹脂(UV_curable resin)或壓敏性黏著劑 (PreSSure-sensitive adhesive ; pSA)(n=15)製成,厚度為如 至 70 μιη。第二記錄堆疊4依序包括一 ZnS/Si〇2(8〇:2〇)(n=2 i5) 製成的第介電層’其厚度為135 nm,以噴濺法沈積而成, •相.又型GelnSbTe合金(結晶態:η=2·9、k==48)製成的可擦 寫式€錄層’其厚度為12 nm,以噴錢法沈積而成,一
ZnS/SiO2(80:20)(n=2.15)製成的第二介, ,以噴賤法沈積而成,一AUn一"" 7/、子度為23 — a π 风 A1(n—L97、k=7.83)反射層,其 厚度為1 00 nm ’也以噴濺法沈積而成。緊鄰第二記錄堆疊心 存在聚碳酸醋(則·58)製成的另一基板5,厚度範圍為二。至 μη另基板5在第二層堆疊4之側的表面内具有飼服 預製凹執或導引凹勤委 . 、圖案。在另一項具體實施例中,在第 -層堆瓦側、透明間隔層3中存在—伺服預製凹軌或導 引凹軌圖本U錄堆疊4依序包括一偶氮或花青染料 (n=2.2、k=G.G2)製成的單寫記錄層,其厚度為8Gnm,及一
Ag(n=〇.28、k=3.8)反射層,其厚度為_ nm,以喷濺法沈 積而成。 圖3頭不依據本發明之錐田 又面又堆登光學資料儲存媒體3〇, 84630 -12- 200402049 其與DVD-ROM標準的D型格式相容。參考數字 及bl與圖2的說明相對應。由紫外光硬化樹、2、3、4 明間隔層3,在第二層堆叠4之側的表 4成的第-透 軌或導引_案。圖2的另__基板5替換預製凹 媒體30進一步包括: 曰 -一可透射輻射光束9的第二塑膠/樹脂 /樹脂層!相對, --包含第三記錄層的第三記錄堆疊2,,其位 塑膠/樹脂層1’, ^ ^ ~ --包含第四記錄層的第四記錄堆疊4,’該第四記錄堆最4, 所處位置距離第二塑膠/樹脂層丄,比第三記錄堆疊^更 遠, -介於第三與第四記錄堆疊之間的笛— 、 τ F且又間的罘一透明間隔層3,,並 厚度範圍為40至70μΓη, _ --第二透光熱阻障扣,其置於第三記錄堆以,與第二 塑膠/樹脂層1’之間。 層與堆® 1’、2,、3,、4,及b2分別等同於層與堆疊】、2、 3、4及b2。因此,雙面雙堆疊媒體在其兩面上具有相同的 設計,將兩面黏合在-起的摘合層6可以為厚度Μ至3〇〇 _ 的PSA。根據基板’及間隔層如,的厚度,可調整輕合 層6的厚度,以使媒體3 〇的總厚度不超過光碟標準中規 定的最大厚度,即1500 ,。但是基板的厚度範圍也受限制, 以防止在記錄層的讀寫操作中所用的聚焦輻射光束9中出現 過度的光學偏差(optical abeirationy。 84630 •13- 200402049 第二記錄堆疊4與第四記錄堆疊4,的預製凹軌(或導引凹軌) 也可存在於耦合層6中,在則青形巾,耦合層可構成為兩面 具有預製凹軌的塑膠層。在此情形中,間隔層3與3,可構成 典預製凹軌的紫外光硬化樹脂或壓敏性黏著劑(PSA)。 應〉王意,上述具體實施例係用以解說而非限制本發明, 熟悉技術人士可設計很多替代具體實施例,而不致脫離隨 附的申請專利範圍之範疇。在申請專利範圍中,任何置於 括號之間的參考符號不應視為限制該申請專利範圍。該用 ~ G έ」並不排除申請專利範圍所列之外的元件或步驟。 在一兀件之前的該用語「一」並不排除存在複數個此類元 件隹的事貫為,在互不相同的申請專利範圍附屬項中 所引用的某些措施,並不代表不能使用該等措施之組合以 具有更多優勢。 依據本發明,說明了 一種借助聚焦輻射光束進行記錄的 光學货料儲存媒體。該光束經可透射該輻射光束的第一塑 膠/樹脂層進入該媒體。該媒體至少進一步包括:一包含第 一記錄層的第一記錄堆疊,其位置緊鄰該第一塑膠/樹脂 層,一包含第二記錄層的第二記錄堆疊,該第二記錄堆疊 所處位置距離該第一塑膠/樹脂層比該第一記錄堆疊更遠, 及一介於該第一與第二記錄堆疊之間的透明間隔層,其厚 度大於聚焦輻射光束的聚焦深度。第一透光熱阻障層係置 於薇第一記錄堆疊與該第一塑膠/樹脂層之間,藉此可使該 媒體之第一塑膠/樹脂層不會或幾乎不會受到該輻射光束所 引起的應力雙折射。該媒體的一雙面形式包括第三與第四 84630 -14- 200402049 記錄堆疊及第二透光熱阻障層。 【圖式簡單說明】 以上參考附圖詳細說明了本發明,其中 圖1顯示依據先前技術雙堆疊光風次 體實施例的示意圖; ”,儲存媒體之-項具 圖2顯示依據本發明雙堆疊光學 卞具行倚存媒辦士 實施例的示意圖; a —-、具體 圖3顯示依據本發明雙面雙堆疊光 予貝料儲'存媒 項具體實施例的示意圖。 蛛也 < 另一 【圖式代表符號說明】 1 第一塑膠/樹脂層 1, 第二塑膠/樹脂層 2 第一記錄堆疊 V 第三記錄堆疊 3 透明間隔層 35 第二透明間隔層 4, 第四記錄堆疊 4 第二記錄堆疊 5 另一基板 6 搞合層 9 輻射光束 10 媒體 20 光學資料儲存媒體 30 雙面雙堆疊光學資料 84630 體 -15- 200402049 bl 第一可透射熱阻障層 b2 第二可透光熱阻障層 16- 84630

Claims (1)

  1. 200402049 拾、申請專利範圍: 1. 一種借助一聚焦輻射光束(9)經一可透射該輻射光束(9)的 一第一塑膠/樹月旨層⑴進入該媒體以進行記錄之光學資料 儲存媒體(20),該媒體進一步至少包括· _包含一第一冗錄層的第一記錄堆疊(2),其位置緊鄰 該第一塑膠/樹脂層, 7包含-第二記錄層的第二記錄堆疊⑷,該第二記錄 堆疊(4)所處位置距離該第一塑膠/樹脂層⑴比該第一記錄 堆疊(2)更遠, -介於邊第一與孩第二1己錄堆疊之間的一透明間隔層 (3)其厚度大於邊聚焦%射光束的聚焦深度, 其特徵在於ϋ光熱阻障層⑽係置於該第—記錄 堆疊與該第一塑膠/樹脂層之間。 2. :申請_專利範圍第i項之光學資料儲存媒體⑽,其中該 第一記錄層係-單窝層’而該第二記錄層係選自-單窝 層、一可擦寫層及一唯讀層中之一層。 3. 如申請專利範圍第丨或2項中任一;之光學資料儲存媒體 (20) ’其中在孩聚焦輕射光束之波長為μ,該熱阻障層 的光吸收係數k<<0.01。 4. 如申請專利範圍第1至3物-項之雙堆疊光學資料儲存 媒體(20)’其中該熱阻障層的—導熱率小於iw/mK。 5. 如申請專利範圍第1至4項φ 負中任—項之光學資料儲存媒體 (2〇),其中該熱阻障層的厚度範圍為⑽咖。 6. 如申請專利範圍第5項之光學資料儲存媒體⑽,其中該 84630 200402049 熱阻障層的厚度範圍為5至5〇 nm 7 ·如申請專利範圍第1至6項中任一 (20),其中該熱阻障層主要包括選 化物及氧化矽所組成之群組中的 8 ·如申請專利範圍第1至7項中任. '項之光學資料儲存媒體 選自由ZnS-Si〇2、矽氧氮 一材料。 碎氧氮 (3 0),其中該媒體進一步至少包括 项之光學資料儲存媒體 該第一塑膠/樹脂層(1)相對, 可透射邊為射光束⑼的帛二塑膠/樹脂層(1》,其與
    鄰該第二塑膠/樹脂層, -一包含一第四記錄層的第四記錄堆疊(4,),該第四記 錄堆疊所處位置距離該第二塑膠/樹脂層(1,)比該第三記錄 堆疊(2’)更遠, -介於遠第二與該第四記錄堆疊之間的一透明間隔居 (3 其厚度大於該聚焦輻射光束的聚焦深度, -一第二透光熱阻障層(b2),其置於該第三記錄堆疊與 該第二塑膠/樹脂層之間。 84630 -2-
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