TW473712B - Rewritable double layer optical information medium - Google Patents

Rewritable double layer optical information medium Download PDF

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Publication number
TW473712B
TW473712B TW087117662A TW87117662A TW473712B TW 473712 B TW473712 B TW 473712B TW 087117662 A TW087117662 A TW 087117662A TW 87117662 A TW87117662 A TW 87117662A TW 473712 B TW473712 B TW 473712B
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TW
Taiwan
Prior art keywords
layer
recording
optical information
stack
information medium
Prior art date
Application number
TW087117662A
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English (en)
Inventor
Harm Albert Wierenga
Johannes Cornelis Norb Rijpers
Original Assignee
Koninkl Philips Electronics Nv
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Publication of TW473712B publication Critical patent/TW473712B/zh

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    • 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
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24035—Recording layers
    • G11B7/24038—Multiple laminated recording layers
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    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal

Description

4^3712 五、發明說明（1) " "一"" '— 本發明是關於一種以雷射光記錄於可重覆寫入雙層之光 學資訊媒體，該媒體的構成包括一個基體，及配置在同一 面的兩個記錄疊層’該記錄疊層都各擁有一個相變記錄 層。 以相位變化的原理儲存光學資訊或資料很吸引人，因為 這種方式兼具直接覆寫和易相容於唯讀系統高儲存密度的 可行性。相變光學記錄和一種以聚焦雷射光在晶態薄膜上 形成次微米大小的非晶態標記有密切關係。在記錄資訊 過程中’該媒體根據要被記錄的資訊來調節聚焦雷射光' 相對地移動。因此，淬熄（quenching)發生在相變記錄層$ 且在曝光區形成非晶態資料位元，使未曝光區域保持'、曰 態。要消除已寫入的非晶態標記是利周相同的雷射加= 重新產生結晶。非晶態標記代表資料位元，可細ώ ' 、'工田低功率 聚焦雷射光在基體重新產生。非晶態標記相對於择曰^ Q . . ^曰曰3己 層的反射角度不同導致了調變的雷射光，後來再細 ,. a由一種 檢測器轉換為依照編碼記錄的數位資訊的調變光電#。 以光學記錄資料的目的之一是在單面碟片上婵★ ^ + 9 //17筒存媒 體容量，就像「可重覆寫入之多樣化數位光碟」 ^ 、 (DVD-Rewritable)和「數位視訊記錄器」（DVR)。經由 低雷射波長又和（或）增加數值孔徑（N A )可以達成产^ ^ 9 乂峻樣的目 的’因為雷射光點的大小和（人/ N A)成比例。另〜L θ ^ 種方式 疋運用多重記錄層。當同一光碟表面使用兩個記錄居 、言 稱為雙層記錄。 ι 一種單一記錄層的相變式光資訊媒體是申請人為阳^志 & _際專
C:\Program Files\Patent\55554. ptd
47371^ 五、發明說明（2) 利權申請案W0 9 7/ 50084 (PHN 1 588 1 )提出後廣為人知。 這著名的相變式媒體由一個基體伴隨一個疊層，該疊層包 含第個如（ZnS)8G(Si02)2G的電介質層、一個GeSbTe化合 物製鱗變記錄層、第二個電介質層以及一個反射金^屬 鏡齋樣的疊層可以視為一種IPIM結構，其中μ代表 反射或鏡射層，I代表電介質層，而ρ則表示相變記錄層。 金屬層亚不只是當作反射鏡，也當成吸熱器，用來確保在 寫入期間迅速冷卻以淬熄成非結晶相位。此習知的記錄媒 體具有很好的循環特性，換句話說就是允許很多次的重覆 寫入和消除動作，適合高速記錄以及即使在多次循環後依 然顯示出低抖動特性。在該專利權申請案中，並沒有揭露 雙層記錄技術。 為了達成雙層記錄，第一個或較上層記錄疊層必須有足 夠的通透性，以確保第二個或較下層記錄疊層有適當的讀 /寫特性。然而，已知可重覆寫入相變記錄的丨ρ丨Μ結構會 有8 0%的晶態吸收以及2〇%的晶態反射，因此，在相變記錄 層中以低功率雷射確保高增溫率、高調變' 和正確磁執。 因為IΡ IΜ結構並沒有通透性，雖然適合周在零傳輸的第二 層或下層記錄疊層，但並不適合用，在第一層或上層記錄疊 層。一種可行方案是將鏡面層Μ以透明的熱導體取代，例 如鋁金屬氮化物。儘管如此，這些用在薄膜中物質的淬熄 能量似乎仍極低。 本發明的一個目的，很特別的是提供一種單面可重覆之 雙層光資訊媒體，該媒體擁有丨Ρ丨Μ結構的記錄疊層，其儲 麵
C:\Program Files\Patent\55554. ptd 第 6 頁 473712 發明說明（3) 存谷Ϊ為單層資訊媒體的兩倍v 依本發明的方式，要達成；目 到的光資訊媒體以這樣的順序組合·就要將一開始所提 -第一記錄疊層，其、組成為一個 質層間，以及與第一記錄疊層中層夾在兩個電介 個透明金屬層和額外的電介質層· ^於每射光入射面的一 -透明間隔層，其厚度比雷射:举 -第二記錄疊層，其組成為一個曰變遏厚·，和 介質層間，以及與第二記錄疊己錄層夾在兩個電 個金屬鏡面層。 且層中运射先入射面相對的_ 本發明所指的光資訊媒體有以 基體丨ΙΡΙΜΙ+ IS | ΙΡΙΜ 的…構· 其中ΙΡΙΜΙ+疊層就是第一疊層加 間隔層，ΙΡΙΜ是第二疊；，T D只•旧包，丨質層1 為 疋禾 且層，1、P、Μ則正如上述所t。恭 射光便是經由基體進入的。 、所。 田 本發明疋&於洞察到當金屬層M以雷射光可透過的薄厶 冉、，口額外的電介質層，ΙΡΙΜ疊層的傳輸率 g增加。例如，包含1〇毫微呆厚度的銀金屬層加額外的電 介質層所組成的疊層其傳輸效果增加了 5〇%，而且對非結 晶和結晶相位間的光學對照並沒有負面影響。也因此寫入 第=豐^時的雷射功率可能降低約5〇%。 第一豐層的金屬層很薄，即丨〇到3 〇毫微米間。這種厚度 足夠用在寫入時淬媳出非結晶相位，並容許有足夠傳輸致 果以4保第二疊層有適當的讀寫特性。金屬可以選擇鋁、
473712
4?3?ie $ '發明說明（5) 為 Ge2Sb2Te5 (x 二 〇·445)、GeSb2Te4(x 二 0·2 8 6 )和 GeSb4Te7 (x = 〇 . 1 6 6 )的化合物。這些化合物具有快速結晶（消除）的 特性。 第一記錄疊層的記錄層其厚度最好在5到1 5毫微米間。 較厚的記錄層會導致過低的傳輸率。第二記錄疊層的記錄 層可以厚一點，在5到3 5毫微米間。 ' 第一記錄疊層中 5己錄層免於受潮， 學對比特性。由防 少要有70毫微米。 制在（70+ λ / 2n)毫 介質層的折射指數 的電介質層厚度基 在兩個記錄疊層 質層為1 0到5 0毫微 薄時，會不利於記 會使記錄層的冷卻 差的循環特性。增 I 速率。 I 第一記錄疊層的 率，且與電介質材 度約60毫微米，n = 在第一和第二記 度還厚，例如1 0微 ’在基體和相變記錄 使基體免於受熱損壞 抖動的觀點來看，電 在光學對比的角度來 微米，其中λ是雷射 。在第二疊層中，在 於相同理由也是選擇 中’在記錄層和金屬 米’最好是20到40毫 錄層和金屬鏡面層間 速率增加，導致減慢 加第二個電介質層的 額外電介質層是用來 料的折射指數η有關， 3時厚度約3 2毫微米 錄疊層間的透明間隔 # °這樣的厚度可以 層間的電介層保護 ，並可充份運用光 介質的厚度最好至 說’這層的厚度限 光的波長，η為電 間隔層和記錄層間 同樣的範圍。 (鏡面）層間的電介 微罘。當這一層太 的隔熱效果。結果 結晶過程益造成極 厚度可以減低冷卻 產生最大的傳輸 >例如，當η = 2時厚 ) 層，要比雷射光深 確保第一和第二記
473712
五、發明說明（6) 錄受層在光學上分隔，例如對焦在第一記錄疊層（的記錄 層）的雷射光不會從/在第二記錄疊層讀/寫資訊，反之亦 然。這種方式的儲存容量是單層資訊媒體的兩倍。間隔;4層 的材料例如UV紫外光硬化丙烯酸膠著劑，可以在覆蓋過^ 提供伺服執道。 ° 資訊媒體的基體至少要讓雷射光波長穿透過，例如可用 聚碳酸酯、聚曱基曱基丙烯酸酯、非晶體聚烯烴或玻璃製
成。典型的例子中，基體為碟形，直徑為120毫米，厚度I 是〇·6或1.2毫米。雷射光進入疊層時會經過基體的進入 面。 圓盤形基體靠記錄層的表面，最好能提供伺服執道以便 作光學掃描。這個伺服執道常常是由螺旋形的凹槽構成， 在基體中經由注入成形或施壓形成這些凹槽也可以選擇 間隔層的人造樹脂的覆蓋過程中形成，例如可外 硬化之丙烯酸。 ^ ^ 疊層的最外層視情況可選擇各種阻隔外界 層，例如UV紫外光硬化聚（甲基）丙烯酸。 兄的保又 記錄和消除資料可以用短波長雷射，例如 微求或更短（紅光或藍光）。 、、 毛 成。 、電子波真空沈澱、化學 相變記錄層可以用真空沈殿、 太菸日肖鸦a - Μ # ^ 技術附貼於基體上。 本發明將以不祀性的1鞔舍 丄 、戶、e例和參考附圖闡釋得j 汽沈澱、離子電鍍或濺散等# 一先 日肖鸦^ - Μ # ^ 技術附貼於基體上 明將以不粑性的1鎪舍 丄
473712 五、發明說明（7) "" ---- 細，在附圖中的fi例顯示出依本發明所製成之光塋链 訊媒體其概略的交接區段综覽。| 。又々貨 示範用具體實施例 一 圖中概略地顯示出依本發明製成之雙層光資訊碟立 份交接區段。其尺寸並不是依比例畫出。由數字i所的邙 的疋直徑1 2 0毫米，厚度0 · 6毫米的聚碳酸酯碟形基出 體1和以下結構組合： 基 第一記錄疊層2為I ΡΙΜΓ結構，其組成如下： 电介質層3’（2113)80(81 02 )20製成，厚度19〇毫微韦 -記錄層4，GeSbJe4化合物，厚度6毫微米， 下 电介質層5’（2113)80(51〇2)2{)製成，厚度^5亳微米， 一透明銀金屬層6，厚度1 5毫微米， 、 一額外電介質層7，氮化鋁製成，厚度22〇毫微米； 間隔層8，UV紫外光硬化丙烯酸製成，厚度5〇微朱； 第一記錄疊層9為IΡIΜ結構，其組成如下： 兒介質層10，（ZnS)8Q(Si02)2(J製成，厚度19〇亳微罘， 一記錄層11，GeSb2Te4化合物，厚度25毫微米， 兒介質層12，（ZnS)S()(Si〇2)2。製成，厚度15毫微米， 一銀金屬鏡面層13，厚度1〇〇毫微朱。 。。記錄層4和11其初始的結晶狀態是以對焦雷射光在記錄 裔中將沈澱型非結晶態合金加熱所形成的。 雷射光束1 4對焦在第一記錄疊層2的記錄層4，用來記 錄、複製和消除資訊，並且是通過基體1進入疊層2。雷射 光束1 5則對焦在第二記錄疊層9的記錄層丨i。
473712 五、發明說明（8) 第一記錄疊層在非結晶狀態時的傳輸率約5 0%，結晶狀 態時約33%。該疊層有很好的記錄特性。在40 00次的覆寫 週期以上，抖動率低於1 3%。 本發明提供一種可重覆寫入的單面雙層相變式光資訊媒 體，像DVD-RAM或DVR —樣，儲存容量則為單層記錄媒體的 兩倍。
C:\Program Files\Patent\55554. ptd 第12頁

Claims (1)

  1. 六 、申請專利範圍 1 · 一種以雷射j ~ # Μ 1 體，該嫫俨4 J先餘的重覆寫入型雙層光學資勺拔 ^媒體包括有依下述 h 卞貝忒媒 構： 貝序和一個基體在同一表面的結 第一記錄疊層，A組# 4 ^ :電介質層間，以及與第變記錄層安插在兩 面的-個透明金屬層和額外的己；工相對於雷射光-射 〜透明間隔層，苴厚产士干t貝 〜第二記鋅A @ 7 ί ί 射光對焦深度還厚；和 兩個電介質声門、且曰 八、，且成為一個相變式記錄層安插在 對的一個金屬鏡面層。 ' 錄且層中田射先入射面相 錚d 2 ΐ利範圍第1項㈣光資訊女某體，# ★ $ 一個記 錄受層的金屬層為10到30毫微米的厚度。 $铃田申％專利範圍第1項的光學資訊媒體，其中第一個 圯錄®層中的金屬層由銀構成。 如申叫專利範圍第丨項的光資訊媒體，其中的間 至少有1 〇微米的厚度。 -a •如申叫專利範圍第1項的光資訊媒體，其中記 GeSbTe化合物構成。 田
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KR20010021658A (ko) 2001-03-15
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WO1999059143A3 (en) 2000-01-06
EP0996950B1 (en) 2008-10-08
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JP4037057B2 (ja) 2008-01-23
JP2002515623A (ja) 2002-05-28

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