TWI337743B - Rewritable optical storage medium and use of such medium - Google Patents

Rewritable optical storage medium and use of such medium Download PDF

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TWI337743B
TWI337743B TW092102190A TW92102190A TWI337743B TW I337743 B TWI337743 B TW I337743B TW 092102190 A TW092102190 A TW 092102190A TW 92102190 A TW92102190 A TW 92102190A TW I337743 B TWI337743 B TW I337743B
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layer
storage medium
recording layer
optical storage
thickness
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TW092102190A
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TW200400506A (en
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Zhou Guo-Fu
Cornelis Norbertus Rijpers Johannes
Johannes Borg Hermanus
Van Schijndel Mark
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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
    • G11B7/2433Metals or elements of Groups 13, 14, 15 or 16 of the Periodic Table, e.g. B, Si, Ge, As, Sb, Bi, Se or Te
    • 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
    • G11B7/241Record 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
    • G11B2007/24302Metals or metalloids
    • G11B2007/24312Metals or metalloids group 14 elements (e.g. Si, Ge, Sn)
    • 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
    • G11B2007/24302Metals or metalloids
    • G11B2007/24314Metals or metalloids group 15 elements (e.g. Sb, Bi)
    • 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
    • G11B2007/24302Metals or metalloids
    • G11B2007/24316Metals or metalloids group 16 elements (i.e. chalcogenides, Se, Te)
    • 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
    • G11B7/004Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045Recording
    • G11B7/00454Recording involving phase-change effects
    • 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
    • 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

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

Description

1337743 細簾1續頁: 記’而不需要熔化該記錄層。該等非结晶狀標圮代表該等 資料位元,例如’由一相當低功率的您焦雷射先東經由該 基板項取該等设料位元。有關结晶狀έ己錄層的該等非結 晶狀標記的反射差異所引起的調變雷射光東,後續由一植 測益根據該記錄的資訊轉換成一調变:的光電凉._、 於相變化光學記錄中,該等最重要的需要之一是高資料 速李’意指能夠以至少2 5 Μ b i t s / s的使用者資料速率將資料 寫與重寫於該媒體。於DOW期間,該高t料速率需要該記 細智具有「§7的結晶速度,即,一短的結晶時間。為瑞保先 前記錄的非結晶狀標記於DOW期間能夠帔再結晶,該記錄 層必須有一適當的結晶速度,以匹配相關雷射光束的媒體 速度。於DOW期間,如果該結晶速度不夠快,將不能完全 抹除先前記錄的該等代表舊資料的非結晶狀標記,即,再 結晶。而上述會導致一高雜訊位準。於高密度記錄與高f 料速率光學記錄媒體中特別需要一高結晶速度,例如於圊 盤形 CD-RW 高速度、DVD_RW、dVD + RW、DVD-RAM、 DVR-紅與藍中,上述分別為已知的光碟與新一代高密度數 位多功能或影音光碟+RW與-RAM及數位影音記錄光學儲 存光% 马’其中_與Ram為該等磁盤的縮寫,而红应 藍為所使用的雷射波長。關於該等新的光碟,$全日: 間(CET)必須低於40-cET係定義於一結晶環境中完成: 已的非結晶狀標記的从a μ + • “ 7…日曰所桌的一抹除脈衝的最小歷昧
°以靜也測試器測量該C F T J 每I 2 0 m m磁盤4
里八上丁。^WtDVD+RVV的記錄密度為 GB ’需要的使用者資枓位元速牟為26 1337743 (·0 _明說明續頁
Mbits/s,而關於DVR-藍的速率為35 Mbits/s,關於高速率 版本的DVD + RW與DVR-藍,則需要較高的f枓速率50 Mlms/s。該音頻/視頻(A/V)應用的資枓速率由/WV資訊流決 定,但電腦資料的應用不受資料速率應用的限制,即·越 大越好。該等資料位元速率的每一個皆可被轉化成一受數 個參數影響的最大C ET,例如,該等記錄堆疊的熱設計與 該等記錄層所使用的材料。 該已知的相變化類型媒體包括一承載一堆疊層的圓盤形 基板,該堆養層包含連續的一第一介電層、一相變化 Ge-Sb-Te合金之記錄層、一第二介電層與一金屬反射層。 該堆疊層可參考一 I P1Μ結構,其中Μ代表一反射金屬層,1 代表一介電層,與Ρ代表一相變化記錄層。該專利案揭露一 種 Ge50xSb40-4〇xTe60-丨 οχ結構,其中準則為 0. 166 $ 0.444
3化學計量G e - S b - T e材料厲於所提到的範圍,如G e 2 S b 2 T e 5 ,可使用作為如DVD-RAM光碟的記錄層。該等化學計量結 構有一種成核主導結晶程序。意指由該標記的成核與後續 的成長發生一已寫的非結晶狀標記的抹除。根據該專利案 ,藉由將該G e - S b - T e層的厚度增加到2 5 n m以減少該C E T, 而接著在進一步增加該層的厚度中,該C ET會趨於一固定 值,大約50-60 ns。為了將該Ge-Sb-Te層使用於高資料速率 記錄,已提出其厚度需介於2 5到3 5 n m範圍的要求。當該記 錄層的厚度變得比25 ns小,該CET值增加到大約80 ns。 該已知的記錄媒體顯示其記錄層的最小CET大約為50-60 n s,而隨著該記錄層厚度變小,該C E T越來越增力π,關於 1337743 (?) 發明観_類頁 多的缺陷:隨著該層厚度的增加,主體形狀的部分材料會 增加,而且超過一定厚度,該材料的性能會受該主體形狀 影響。表面上,該等主體材料具有比該等介面材料更適合 的成長速度3
在進一步增加該相變化層的厚度中,因該材枓的體楨增 加而導致該 CET增力σ <該專利案所提出的Ge-Sb-Te材料的 結晶程序是成長主導。該材料被結晶的體楕變得浪重要。 該結晶的大小通常是I 0 Iim。當該層是薄的,則需要雙維度 的成長,而該成長需要一較短的時間。當該層受得校厚時 ,則需要三維度的成長,該成長自然需要較長的時間。 於根據本發明之光學儲存媒體之一最诖實施例中 '該記 錄層的厚度在8.5到1 3 nm的範圍内。於該範圍内,該C ET 低於3 5 n s,甚至於更高的資料速率。
於根據本發明之光學儲存媒體之另一最佺實矻例中,該 第二介電層的厚度為20到40 η m。該苐二介電層·即,,在該 記錄層與該金屬反射層之間的該層,最理想的厚度介於丨5 到5 0 n m之間,最好介於2 0與4 0 n m之間。當該層太薄時, 對該記錄層與該金屬反射層之間的熱絕緣有不判的影響。 因此,增加該記錄層的冷卻率,會導致緩慢的結晶程序與 差的可覆寫次數。藉由增加該第二介電層的厚度,以減少 該冷卻率,該C E T對該金屬反射層的厚度不敏感:例如該 厚度的範園可從20到200 nm。但當該金屬反射層比60 nm 薄時,因該冷卻率太緩慢,會對該可覆寫次數有不利的影 響。當該金屬反射層為丨60 iim或更厚時,該可復寫次數進 -1()- 1337743 (6) 發明說明續頁 一步下降,而且因增加的熱傳導,該記錄與抹除功率必須 是高的。該金屬反射層的厚度最好介於8 0與1 2 0 n m之間。 於根據本發明之光學儲存媒體還有的另一最诖實施例中 ,該第一介電層的厚度為70到500 nm。當該g —介電層的 厚度低於70 nm時,對該媒體的可覆寫次數有不利的影響。 而厚度大於500 nm時會使該層發生應力與更昂贵的沉積。
於根據本發明之光學儲存媒體之一特別的實施例中,該 堆疊存在另一記錄層,與該(第一)記錄層具有相同的結構 。該另外的記錄層失在一些與該(第一)記錄層的該等介電 層相似的介電層之間。進一步可存在其他的附屬層。於一 所謂的多記錄堆疊媒體中,存在二或更多的記錄層,由一 些中間層以大於該雷射光束的聚焦深度的距離彼此分隔。 有時以 U代表多堆疊設計,其中η表示0或一正整數。該雷 射光束通過進入的第一堆#稱為L (),而由L ! ... L „代表每一 深層的堆疊。應瞭解深層是以進來的雷射光束的方向而定 。在對該媒體寫與讀的期間,該雷射光束聚焦在該等Ln堆 疊之一的記錄層。例如,於具有L()與L,堆疊的雙堆疊案例 中,為了有充分的寫能量與讀取信號,該“堆疊必須足以 穿透。只有當L()堆疊的記錄層的厚度相當低為25 nm或更薄 時才有可能。L!堆疊是深層堆疊,可具有較厚的記錄層, 因為不需要被光穿透。根據本發明,低的C E T與薄的記錄 層厚度相結合,可使根據本發明的記錄層適用於一多記錄 堆疊媒體。 該第一與第二介電層可由Zn S與S 1 〇2的混合物製成,例如 1337743 ⑺ ______ (ZnS)x„(Si02)2„。替代物為例如 Si〇:、Ti02、ZnS、A1N 與 T a: Ο 5 該介電層最好包括一碳化物·例如S l C、C ' T a C 、Zi+C或TiC。該等材料提供比ZnS- Si〇4l合物更高的結晶 速度與更好的可復寫次數。 關於該金屬反射層可使用的金屬是例如A1、TI、A u、N1 、C Li、A g、C r、Μ ο、W與T a,及該等金屬的合金: 該資枓儲存媒體的基板至少可被該雷射波長穿透,而且 由例如塑勝,壓克力樹脂(Ρ Μ Μ A),非結晶狀聚鏈烯烴或玻 璃製成。該基板的穿透性僅當該雷射光束經由該基板的進 入表面進入時才需要。於典型的範例中,該基板為一直徑 1 20 mni且厚度0.丨、0.6或I .2 niin的圓盤形。當該雷射光束 經由該基板邊的對面邊進入該堆疊時,該基板可以是不透 光的。於最近的案例中,該堆疊的金屬反射層與該基板相 姐!:連。上述也屬於一反向堆#。一反向堆疊例如可使用於 該D V R光碟。 該圓盤形基板在該記錄堆疊邊的表面,最好具有可被光 學掃瞄的伺服磁轨。該伺服磁執往往由一螺旋槽構形成, 並且於注射模或模壓期間,以模子形成於該基板。此外, 可於該間隔層的合成樹脂摺疊程序中形成該等溝槽,例如 ,一 UV光固化壓克力。 另一選擇,藉由使用一如U V光固化聚(甲基)丙烯酸的保 護層遮蔽該堆疊的最外層。當該雷射光經由該保護層進入 該記錄層時,該保護層必須有好的光品質,即,幾乎完全 不受光學像差的影響,且厚度幾乎完全一致。於該案例中 1337743 ⑻ 發明說明續頁 ,泫保砹層對該雷射光而言是可穿透的,並可稱為復蓋層 。對於DVR光碟,該覆蓋層的厚度為〇丨mni。 藉由使用如660 nm或更短(红到藍)的短波長雷射可完成 對沒等έ己錄堆疊的記錄層的記錄與抹除資料。 該金屬反射層與該介電層兩者皆可由蒸發或濺鍍提供。 該相k化記錄層能藉由真空沉積復蓋在該基板上。已知 的真空沉積處理有蒸發(電子束蒸鍍,熔化鍋的抗加熱蒸鍍) 、政鍵、低壓力化學氣相沈積、離子鍍、離子東輔助蒸發 '電裝化學氣相沈積。由於有太高的反應溫度,所以不能 使用 的熱C V D處理。以此方式沉積的該層是非結晶狀 且玉現低反射。為了構成一種合適且具有高反射的記錄層 ’钱層首先必須完成結晶,通常稱為初始化。為了該目的 ’該層於熔爐中被加熱到超過該金的結晶溫度 ’例如1 8(TC。此外,能夠以一種具有足夠功率的特殊雷射 光加熱合成樹脂基板’例如合成塑勝。上述可實現於一特 殊的記錄體’於該案例中,該特殊的雷射光束掃描該移動 的记錄層。接著區域加熱該非結晶層達到結晶該層所需的 溫度’ 4基板不党不利的加熱負載影響。 籍由使用一種短波長雷射’例如具有6 6 〇 ^ ηι的波長咬更 短(紅到藍)’以實現高密度的記錄與抹除。 實施方式 圖丨顯示一種根據本發明之可抹除高速記錄之可重芎光 學儲存媒體丨0的部分刟面圖。最好由雷射光東6的構件記錄 與筇取° 4媒體丨0具有一由直徑丨20 m m與厚度〇 6 m⑴的 -13 - 1337743 (9) 發明說钥續頁 所製成的基板丨。在該基板上有一丨P丨Μ堆疊層,其包括一厚 度d 2 = 7 Ο η ηι的(Z n S ) X 〇 ( S i 0 2) 2 〇的第一介電層2,一分子結構 為G e 7 S b 7 6. .1T e ! 6.,厚度d的相變化材料記錄層3,及一厚度 d_i = 20 nm 的(ZnS)x〇(Si02)2〇 的第二介電層 4與一厚度 delOO n m的A丨金屬反射層5。該記錄層3的厚度d 在4與3 0 n m間變 化。該變化影響的結果顯示於圖2。
藉由一合適的目標蒸汽沉積或濺鍍將該相變化記錄層3 塗佈在該基板上。於如早先所描述的特定記錄體中,以此 方式將該層3沉積成非結晶形並初始化,即,結晶。也以濺 鍍提供該等層2、4與5。
用以記錄的雷射光束6經由基板丨複製與抹除登錄該記錄 層3的資訊。以一單一雷射脈衝功率1.25 Pm(Pm =熔化的 臨界功率)與歷時丨〇〇 ns寫入該等非結晶形的標記。該抹除 功率為Pu/2。注意該替代實施例中,基板1可毗連該金屬反 射層5,而該雷射光束6仍然通過層2進入該記錄層3。於該 案例中,可有一如〇.丨m m的非必須的光學可穿透遮蓋,與 該介電層2相毗連。 於圖2中顯示以n s為單位的C E T與以n m為單位的化合物 G e 7 S b 7 6.4 T e ! 66相變化記錄層3的厚度d 的關係。由圖2的曲 線丨1瞭解,藉由增加該d;到大約1 0 nm而迅速降低該CET, 而且在d;進一步的增加中,該C E T慢慢增加且飽和達到大 約4 7 η s的低值。 請注意上面所提到的實施例是為了說明,而不是限制本 發明,而且熟悉此項技藝之人士不需違背該附加的申請專 -14 - 1337743 (10) 麵議:明:續聂
利範圍的領域 '即可設計許多替代的贫砲例。’於該申請專 利範圍中,括號内的任何參考符號不應被解釋為限制該申 請專利範团。該字”包括”不排除存在未列舉於該申請專利 範圍内的元件或步驟。元件前面的字”一"不徘除該等元件 有複數個存在。只不過事實上某種方法詳述於彼此不同所 屬的申請專利範圍,並不表示使用該等方法的結合是無益 的。 根據本發明提供一毪可抹除光學儲存媒體,適闬於直接 複寫與高資料速率記錄,且具有一相當薄的相變化類型記 錄層與一可能至少25 Mb/s的資料速率,例如DVD + RW與可 重寫的D V R。 圖示簡單說明 以示範實施例及該等相關的附加圖示更加詳細地說明本 發明,其中 圖丨顯示根據本發明的一光學儲存媒體的概要剖面圖,及
圖2顯示C E T (以n s為單位)與該G e 7 S b 7 6.4 T e丨“材料記錄層 的厚度d(以n m為單位)間的關係。 圖式代表符號說明 10 可重寫光學儲存媒體 6 雷射光束 1 基板 2 第一介電層 3 5己紅層 4 第二介電層 5 金屬反射層 -15 -

Claims (1)

1337743 第092102190號專利申請案 中文申請專利範圍替換本(99年9月)拾、申請專利範圍 Μ年([月V"曰修 正木 1. -種使用-聚焦雷射光束的可抹除高速資料記錄之可重寫 光學儲存媒體,該媒體包括: 一基板:及 一在遠基板上的堆疊層;該堆疊包括: 一第一介電層; L括由Ge 與Te所組成之合金的相變材料記錄層; 一第二介電層;及 金屬反射層’其中該合金的結構由該分子式GexSbyTez 按原子百分比定義,其中〇<χ<15,5〇<y<8〇,]〇<z<3〇且 x+y+z-100,且特徵為該記錄層的厚度在了到範圍内。 !.如^請專利範圍第1項之光學儲存媒體,其特徵為該記錄層 的厚度在8.5到13 nm範圍内。 .如申請專利範圍第1或2項中任一項之光學儲存媒想,其特徵 為該合金的結構由分子式GexSbyTez按原子百分比定義,盆中 6<x<8,70<y<80 , 15<z<2(^x+y+z=l〇〇。 其特徵為該第二介 其特徵為該第一介 其特徵為一另外的 如申請專利範圍第1項之光學儲存媒體 電層的厚度為2〇到40 nm。 如申請專利範圍第丨項之光學儲存媒體 電層的厚度為70到500 ητπ。 6. 7. 如申請專利範圍第丨項之光學儲存媒體 . 記錄層存在該堆叠中’具有與該記錄層相同的分 -種如申請專利範圍第1至6項中任一項之光。 :用’其用以具有一資料速率高於2一高心= 83382-990928.doc
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