TWI233613B - Rewritable optical data storage medium and use of such a medium - Google Patents

Rewritable optical data storage medium and use of such a medium Download PDF

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Publication number
TWI233613B
TWI233613B TW091111465A TW91111465A TWI233613B TW I233613 B TWI233613 B TW I233613B TW 091111465 A TW091111465 A TW 091111465A TW 91111465 A TW91111465 A TW 91111465A TW I233613 B TWI233613 B TW I233613B
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Taiwan
Prior art keywords
layer
recording
data storage
optical data
storage medium
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TW091111465A
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English (en)
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Guo-Fu Zhou
Johannes Cornelis Norb Rijpers
Erwin Rinaldo Meinders
Hermanus Johannes Borg
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Koninkl Philips Electronics Nv
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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
    • G11B7/252—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
    • 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
    • G11B7/243—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 inorganic materials only, e.g. ablative layers
    • G11B7/2433—Metals or elements of Groups 13, 14, 15 or 16 of the Periodic Table, e.g. B, Si, Ge, As, Sb, Bi, Se or Te
    • 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
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24067—Combinations of two or more layers with specific interrelation
    • 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
    • G11B7/243—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 inorganic materials only, e.g. ablative layers
    • 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
    • G11B7/241—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
    • G11B7/243—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 inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24312—Metals or metalloids group 14 elements (e.g. Si, Ge, Sn)
    • 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
    • G11B7/243—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 inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24316—Metals or metalloids group 16 elements (i.e. chalcogenides, Se, Te)
    • 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
    • G11B2007/25708—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
    • 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
    • G11B2007/2571—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 14 elements except carbon (Si, Ge, Sn, Pb)
    • 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
    • G11B2007/25715—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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • G11B7/00454—Recording involving phase-change effects
    • 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
    • G11B7/258—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
    • G11B7/259—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 silver

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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)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

Description

1233613 A7
發明領域 本發明係關；^ m -欠， 爽，…：種先學育料儲存媒體’藉由聚焦雷射光 、二重新寫入的記錄中’該媒體具有-基板，於 /、一側會進行沉積記錄堆疊，其包括： ； -至少一透明層， -一相位改變型記錄層 -一金屬反射層。 本發明亦關於此一光學資料儲存媒體在高 用中的使用。 資料率記錄應
發明背景 從歐洲專利申請案號Ep 〇849729 ^中，可發現開頭段落 中所提及類型的光學資料儲存媒體的一種具體實施例。在 此專利申請案中所述的具體實施例，具有可用於可重新寫 入的相位改變記錄中的丨ΓΙΡΙΜ|結構，其中乂係一具有高 光學反射的金屬反射層，丨代表的係一介電層，1+代表的2 -透明高硬度層，p代表的係—相位改變型記錄層。在此結 構中，該雷射光束會先進入該1+層。該广層係為了改良該媒 體在寫入特徵方面的穩定性，例如跳動。可當作該高硬度 層1+的材料有各種化合物，例如矽、鍺、鋁、鈦、鍅、鈕、 鈮、銦、錫、鉛、鎂等的氧化物及氮化物，及銦錫氧化物。 根據相位改變原理的光學資料儲存媒體相當地受到歡迎 ，因為其可以簡易的相容性，將直接覆寫（D0W)及高儲存 密度與唯讀光學資料儲存系統結合。資料儲存，在本文中 ’包括數位視訊、數位音頻，及軟體資料儲存。相位改變 訂
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1233613
光學記錄包括利用聚焦較高功率雷射光束，在結晶記錄層 ^形成次毫米大小的非晶性記錄標記。在資訊記錄期間， °亥媒體會相對於該聚焦雷射光束移動，該光束會根據欲記 錄的資訊進行調變。t該高功率#射光束溶化該結晶記錄 層^便會形成標記。當該雷射光束關閉及/或隨後相對於該 記錄層移動時，已熔化的標記便會在該記錄層中冷卻，在 2記錄層的曝露區域中留下非晶性的資訊標記，而在未曝 硌的區域中則仍然是結晶體。透過相同的雷射在較低的功 率位準中’不必熔化該記錄層，經由加熱重新結晶化，便 可抹除已寫入的非晶性標記。該非晶性標記代表的係資料 位元，其可透過該基板，利用較低功率的聚焦雷射光束進 行靖取。與該結晶記錄層有關的非晶性標記反射差異會造 成調變的雷射光束，其隨後會被偵測器轉換成根據該記錄 資訊的調變光電流。 相位改變光學記錄的其中一項最重要的需求便是高資料 率’其意謂著可以至少30Mbits/s的使用者資料率將資料寫 入及重新寫入在該媒體中。在D〇w期間，此高資料率需要 該記錄層具有高結晶速率，也就是，短結晶時間。為確保 在DOW期間，能夠重新結晶化前面已經記錄的非晶性標記 ，該記錄層必須具有適當的結晶速率，以匹配該媒體對於 該雷射光束.的相對速度。如果結晶速率不夠快的話，那麼 ，在DOW期間，便無法完全抹除，即重新結晶化代表舊資 料之先前記錄的非晶性標記。這會造成高雜訊位準。在高 密度記錄及高資料率光學資料儲存媒體中，特別需要高結 本紙張尺度適用中國國家標準(CNS) A4规格(210 X 297公釐)
f 訂
1233613 A7 B7 五、發明説明（3 ) 晶速率，如碟片型的高速CD-RW、DVD-RW、DVD+RW、 DVD-RAM、DVR-紅及藍，其分別係熟知的光碟及新一代 高密度的數位影碟+RW及-RAM，其中RW及RAM表示此類 碟片的可重新寫入性，及數位影像記錄光學儲存碟片，其 中紅及藍表示所使用雷射波長的縮寫。該些碟片的完全抹 除時間（CET)必須低於30奈秒。CET的定義係完全結晶化已 寫入於結晶環境中的非晶性標記的抹除脈衝的最小時間長 度，其係利用靜態測試器量測。對DVD+RW來說，其在120 毫米的碟片中有4.7 GB的記錄密度，所需要的使用者資料 位元率為26 Mbits/s，而對DVR-藍來說，該速率則為35 Mbits/s。對高速的DVD+RW及DVR-藍光版本來說，需要50 Mbits/s或更高的資料率。每種資料位元率都可以最大的 CET表示，其會受到幾種參數的影響，例如記錄堆疊的熱 設計及所使用的記錄層材料。 因此，其中一項目的係提昇光學記錄媒體的資料率，如 可重新寫入DVD及DVR(數位錄影機）的資料率。如上所解釋 ，這可利用提高該相位改變材料結晶化速率（可進一步縮短 CET)而達成。但是，當結晶化速率變高，非結晶化便會變 得相當困難，因為在資料寫入期間，無法避免會在結晶背 景中成長微晶。這會造成具有不規則邊的小型難以讀取之 非晶性標記，其會導致相當高的跳動位準。利用較高的記 錄層冷卻率可對付微晶成長。與該記錄層相鄰的層中必須 充分地散熱以確保能夠在記錄期間正確地形成非晶性標記 。該些如介電層之相鄰層的熱傳導性似乎相當低，因而無 -6- 本紙張尺度適用中國國家檩準(CNS) A4規格(210X297公釐) 裝 訂
線 1233613 A7 B7 五、發明説明（4 法快速地降低該記錄層中的溫度。過慢的冷卻行為可能亦 無法在兩速貧料率中成功地寫入一層之中。換言之，該非 晶性標記的結構會因為進行實質重新結晶的P層慢速冷卻率 而被大部份抵銷。 發明概要 本發明的其中一項目的係提供一種如開頭段落所述種類 的光學貧料儲存媒體，其具有改良的散熱槽作用，可確保 在該記錄堆疊的記錄層中，形成正確的非晶性標記。 此目的可藉由具有下面順序包含銦錫氧化物材料的透明 層達到，而不使用記錄堆疊： -一姻锡氧化物層 -一第一介電層 -一相位改變記錄層 第二介電層 -一金屬反射層。 本發明係基於銦錫氧化物（ITO)層的熱傳導性高於熟知的 透明層，例如在光學記錄技藝中所熟知的慣用介電層。因 為在該記錄堆疊使用ITO當作透明層，其熱阻相當低，所以 熱度可以輕易地流入該金屬反射層。因為電傳導性相當高 ，所以ITO係一種可在液晶顯示器（LCD)中當作透明電極的 材料。但是卻未聽過使用IT0在光學.記錄堆疊中，當作具有 南熱傳導性的材料。因此，本發明可達到50 Mbits/s以上的 資料率。降低介電層厚度亦可達到高冷卻率，但是因為光 學條件限制，通常都不希望如此。 1233613 五、發明説明（5 ；-- —在本發明光學貢料儲存媒體的其中一個具體實施例中， z透月層係放置在該記錄層及該金屬反射層之間。與非·Ι丁〇 :月層比較起來，使用ΙΤ〇當作透明層時，該金屬反射層及 該記錄層之間的熱阻相當低。 。在+進一步的具體實施例中，該透明層會與該記錄層接觸 藉由直接接觸，在記錄期間，該記錄層的熱可以最佳的 方式傳輸至該透明的ITG層，並且可將CET更進_步地縮短 約 10% 〇 在另具體貝施例中，在該記錄堆疊中，在與該透明層 相反之。己錄層中，具有另一個透明層，其係由姻锡氧化物 材料所組成。依照此方式，可形成一熱對稱的堆疊，其在 遠圯錄層的兩側都具有一具散熱槽作用的透明層。其優點 係可改良冷卻行為，其可對該記錄層中的非晶性標記進行 更理想的寫入及抹除。 在另一具體實施例中，在該記錄堆疊中至少會有一介電 層與該記錄層接觸。此介電層可用以將該IT0層與該記錄層 隔離。在部份情形中，可能會希望將該ΙΤ0層與該記錄層隔 離，免得該記錄層的材料會與該ΙΤ〇層的材料產生反應。再 者其可用以微調該堆疊的光學設計及/或微調該記錄層與 該1το層之間的熱阻。該介電層I較佳的係由感測劑及Si02 作匕&物製作而成，例如（ZnS)8〇(Si〇2)2〇。該層亦可能由 、Ta2〇5、Ti〇2、ZnS，包含其非化學計量組成物製作而成。 在進一步的合適具體實施例中，該介電層係由下列各物 ，包含其非化學計量組成物，所組成之群中選出，A12〇3、 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐) 1233613
SlC、Sl3N4、Mg0、Zn〇及A1N。該些層可在DOW期間，提 升該非晶性標記的結晶化速度，直接產生較高的資料率。 該些層及該記錄層之間的介面可當作該非晶性標記結晶化 的晶核源。 在另一合適的具體實施例中，該金屬反射層包括金屬銀 。銀的熱傳導性非常高，其可結合IT〇層得到更高的冷卻率。 較佳的係’當位於該金屬反射層及該記錄層之間時，該 透明層的厚度在10至50奈米範圍之間。層厚度過厚，傳輸 至違金屬反射層的熱傳輸能力便會降低。再者，層厚度過 厚會破壞5亥§己錄堆疊的光學對比，非晶性標記及結晶體背 景之間的反射差。 較佳的係，當位於該記錄層遠離該金屬反射層側時，該 透明層的厚度在50至250奈米範圍之間。在此範圍中的層厚 度可提供較佳的記錄堆疊光學對比。 該記錄層較佳的係由鍺及碲所組成。進一步可使用的有 鍺-銻-碲，鍺-銦-銻-碲及銀_銦_銻_碲化合物。特別有用的 係為’在由申請人提出申請的國際專利申請案w〇 〇1/1337〇 及WO 97/50084中所述的化合物。WO 97/50084中的化合物 係由下面化學式的原子百分比定義：
Ge50xSb40_40xTe60-10x，其中 0·166 < X < 0.444 〇 該些組成物 係位於連接三角形鍺-銻-碲組成物構造圖中的GeTe及Sb2Te3 化合物的直線上，並且包括化學計量化合物Ge2Sb2Te5 (χ=〇·444)、GeSb2Te4 (χ=〇·286)及 GeSb4Te7 (χ=〇·166)。該些 化合物所需要的結晶化（抹除）時間相當短。 -9- 本纸張尺度適用中國國家標準(CNS) Α4規格(210 X 297公釐)
黎 訂
A7 B7 1233613 五、發明説明（7 ) W0 01/13370中的化合物係由下面化學式的原子百分比定 義：
Qa Inb Sbc Ted (依原子百分比），其中 Q係由銀或鍺所組成之群中選出， 2<a<8 0<b<6 55<c<80 15<d<30及a+b+c+d=100 〇 該資料儲存媒體的基板至少係對雷射波長為透明的，並 且係由，舉例來說，聚碳酸酯、聚甲基丙烯酸甲酯（ρμμα) 、非晶性聚烯烴或玻璃製作而成。只有當該雷射光束經由 該基板的入射面進入該記錄堆疊時，才會需要該基板的透 明度。在一典型的實例中，該基板係為碟型而且直徑為12〇 毫米，厚度為0.6或1·2毫米。當雷射光束經由該基板的反側 進入該堆疊時，該基板可能係不透明的。 該記錄堆疊側上的碟型基板表面上，較佳的係具有一伺 服執道，其可進行光學掃描。此伺服軌道通常係由螺旋狀 的溝紋構成，並且係在射出鑄模或壓印期間，利用一模具 形成於該基板中。或者，該些溝紋可利用反覆的程序形成 於該間隔層的合成樹脂中，舉例來說，可以υν光固化的丙 烯酸酯類。 視情況，可利用保護層，舉例來說，可以υν光固化的聚 (甲基）丙烯酸酯類，將該堆疊的最外層與環境隔離。當雷 射光束經由該保護層進入該記錄堆疊時，該保護層的光學 -10· tBS Α4^(210Χ 297^) 1233613 五、發明説明（8 品質必須相當良好’也就是，實質上沒有光學像差而且實 質上厚度相當均勻。在此情形中，該保護層當然對於雷射 光係透明的。 可利用短波長雷射，例如波長66〇奈米或更短（紅光至藍光） ，圮錄及抹除該記錄堆疊記錄層中的資料。 生該金屬反射層及該介電層都可利用蒸發或噴濺的方式產 該ITO層可利用噴濺或濕式化學方法產生。 因 該相位改變記錄層可藉由真空沉積的方式塗敷該基板上 。熟知的真空沉積法有蒸發（電+束蒸#，從掛竭中電阻式 加熱蒸發）、噴濺、低壓化學汽相沉積（CVD)、離子電鑛工、 離子束輔助蒸發、電聚增強CVD。由於反應溫度過高X 此無法使用正常的熱CVD方法。 圖式簡單說明 的 本發明將參考具體實施例及參考隨附的圖式作田 說明，其中： v 面 圖 圖圖1至5所示的係根據本發明之光學資料儲存媒體的剖 ，=6所示的係非根據本發明之光學資料館存媒體的剖面 所示的係該記錄層的炫化臨界功率W該記錄 :-反射層之間各層總厚度m的兩個函數關係冑。x 較佳具體實施例詳細說明 圖1中所示的係根據本發明可利用聚焦雷射光束1Q重新寫 -11- i張尺度it財閱冢標準(_威格― X 297公釐) 1233613 五、發明説明（9 入記錄的光學資料儲存媒俨 聚碳酸醋_乍而成媒體2°具有一基板卜由 -一透明層4， -一相位改變型記錄層6， -一金屬反射層3。 透明層4包括銦錫氧化物（1丁〇)材料。透明層*係放置在記 錄層6及金層反射層3之間，並且與記錄層6接觸。透明層4 的厚度為25奈求。該ΙΤ0材料對於67()奈米雷射光波長的複 合反射率為n=2.GG.iG.G2，其對該雷射光的吸收性很低。 在》亥。己錄堆宜2中’在與該透明層4側相反之記錄層6侧中 〃有另j固透明層8 ’其係由銦錫氧化物材料所組成。該 另-個透明ΪΤΟ層8的厚度為13〇奈米。金屬反射層3係由金 屬銀構成而厚度為100奈米。記錄層6係由 GeuInySbaoTe24.5原子組成物構成而厚度為1〇奈米。當記 錄層6係非晶性狀態時，將記錄堆疊2對於67〇奈米波長=光 學反射率定義為Ra並且其值為i ·7%。當記錄層6係結晶狀態 時，將記錄堆疊2對於670奈米波長的光學反射率定義為心 並且其值為29.6%。光學對比為94 ·3%«光學對比的定義為 I Rc-Ra 丨/Rmax ’其中Rmax係Rc或113之間的最大值。 在該另一個ITO透明層8的旁邊有一保護層9，例如由雷射 光透明可UV固化樹脂所構成，其厚度為1 〇〇微米。利用旋 塗法及隨後進行UV固化便可提供層9。亦可藉由壓感式黏 著（PSA)層進行塗敷，例如一層聚碳酸酯（pC),提供該保護 •12- 本紙張尺度適用中國國家標準(CNS) A4规格(210 X 297公釐) 1233613 A7 -~---—_ B7_ 五、發明説) ：--— 層9 〇 圖2所不的係光學資料儲存媒體20的另一具體實施例，其 中在该記錄堆疊中至少有一介電層5，7與該記錄層6接觸。 特定言之，介電層5，7係位於該記錄層6的兩側。在所有的 $體貫施例中’該介電層係由（ZnS)8〇(Si〇2)2〇構成。每個 介電層的厚度為5奈米。IT〇層4與8的厚度分別為2〇及14〇奈 米。基板1、記錄層6、金屬反射層3及保護層9都與圖丨具體 a %例中所述的相同。Ra的值為ι·9%，而心的值為299%。 光學對比為93.6%。 圖3所不的係媒體2〇的一具體實施例，其中ιτ〇層4係位於 忒圯錄層6與該金屬反射層3之間。該ΙΤ〇層的厚度為2〇奈米 。；|電層7係位於該覆蓋層及該記錄層之間，其厚度為 奈米。介電層5係位於該ΙΤ〇層及該記錄層之間，其厚度為$ 奈米。基板1、記錄層6、金屬反射層3及保護層9都與圖i具 體貫施例中所述的相同。Ra的值為23%，而的值為3ι 。光學對比為92.9%。 圖4所不的係媒體2〇的另一具體實施例。其與圖3的具體 貫％例相同，但是將金屬反射層3與記錄層6之間的介電層$ 移除而該ITO層4的厚度為25奈米。Ra的值為2·4%，而心的 值為31.7%。光學對比為92.5%。 圖5所示的係媒體2〇的另一具體實施例。該汀〇層8係位於 該記錄層6遠離該金屬反射層3側並且與該記錄層6接觸。介 電層5係位於該記錄堆疊2中在最接近金屬反射層3的記錄層 6側與該記錄層6接觸。該介電層5的厚度為25奈米而該ιτ〇 -13-
五、發明説明（” 層8的厚度為130奈米。基板1、記錄層6、金屬反射層3及保 4層9都與圖}具體實施例中所述的相同。&的值為14%， 而Rc的值為28.7%。光學對比為95 2%。 為進行比#乂，圖6所示的係非根據本發明之光學資料儲存 媒體的典型具體實施例。該媒體2〇具有一基板丨，於其一側 上沉積一記錄堆疊2。該記錄堆疊2係由下面至少一層所構 成：一透明層5及/或7、一相位改變型記錄層6及一:屬反 射'3。透明介電層5, 7係位於該記錄層的兩側。介電層5 ，7係由（ZnS)8〇(Si〇2)2〇構成。介電層7的厚度為m夺求 而介電層5的厚度為25奈来。此具體實施例並未含有玎〇層 。基板1、記錄層6、金屬反射層3及保護層9都與圖丨具體實 施例中所述的相同。Ra的值為2G%，而&的值為3Q8%。光 學對比為93.5%。 在圖7中，圖形7!及72所示的分別係下面兩者的溶化臨界 功率Pt(單位為毫瓦）： -圖6中的媒體，也就是非根據本發明，其中該介電層5的 厚度係可變的，及 -根據圖3中的媒體，也就是根據本發明，其中介於汀〇層* 與金屬反射層3之間的介電層5的厚度為1〇奈米而非5奈米' 其中3亥1丁0層4的厚度係可變的。 ” 圖中所示的熔化臨界功率係金屬反射層3與記錄層6之間 各層總厚度dp_m(單位為奈米）的函數。在圖6中，其就是 (ZnS)S()(Si〇2)2〇介電層5的厚度。在圖3中，其係介電層$與 ITO層4的厚度總合。實際上，因為介電層5的厚度係恆定的 -14- 本紙杀尺度適用中國國家標準(CNS) A4規格(210X297公釐) 1233613 A7 B7 五、發明説明（12 ) ，所以只有ITO層4的厚度係可變的。比較圖71及72可清楚 地看見，ITO層4會實質地增加熔化臨界功率。這表示具有 ITO層4時，記錄層6與金屬反射層3之間的熱傳導性比較好 。因為熱傳導性比較好，所以記錄層6的冷卻率會提昇。 應該注意的係，上述的具體實施例並非限制本發明，熟 習本技藝的人士將能夠在不脫離隨附申請專利範圍的範圍 設計各種替代的具體實施例。在申請專利範圍中，括弧内 的參考記號都非限制本申請專利範圍。「包含」一字並不 排除申請專利範圍以外的元素或步驟。在元素前面的冠詞 「一個」並不排除複數個此類元素。在彼此不同但是相關 的申請專利範圍中，所敘述的單位並不表示不能將該些單 位組合使用以產生優點。 根據本發明，具有改良後冷卻行為之記錄層的可重新寫 入光學資料儲存媒體可產生更高的資料率供高速記錄使用 ，並且其適合直接覆寫的碟片，例如高速CD-RW、 DVD + RW、DVD-RW、DVD-RAM、DVD-紅光及-藍光。 -15- 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐)

Claims (1)

  1. ，藉由聚焦雷射光束（10)可 該媒體（20)具有一基板（1)， 一種光學資料儲存媒體（20), 用於可重新寫入的記錄中，髮 於其一側會進行沉積一記錄堆疊（2)，其包括： 至少一透明層（4) 一相位改變型記錄層（6) 一金屬反射層（3) 不使用具有下面順序之一記錄堆疊（2): 一銦錫氧化物層 一第一介電層 一相位改變記錄層 一第二介電層 一金屬反射層， 其特徵為該透明層（4)包含銦錫氧化物材料。 2·如申請專利範圍第1項之光學資料儲存媒體（2〇)，其中該 透明層（4)係放置在該記錄層（6)及該金屬反射層（3)之間。 3 ·如申請專利範圍第1或2項之光學資料儲存媒體（2〇)，其 中該透明層（4)會接觸該記錄層（6)。 4·如申請專利範圍第1或2項之光學資料儲存媒體（2〇)，其 中在該記錄堆疊（2)中與該透明層（4)側相反之記錄層（6) 側中’具有另一個透明層（8)，其係由銦錫氧化物材料所 組成。 5·如申請專利範圍第1或2項之光學資料儲存媒體（20)，其 中在該記錄堆疊（2)中至少有一介電層（5，7)會接觸該記 錄層（6)。 本紙張尺度適用中國國家標準(CNS) A4規格(210X297公釐) ψ- ij m 1233613 菜參 育曰 Α8 Β8 C8 D8 申請專利範圍 如申請專利範圍第5項之光學資料儲存媒體（2〇)，盆中該 介電層（5, 7)係由 Al2〇3、SlC、Sl3N4、Mg〇、Zn(^AiN 所組成之群中選出，包含其非化學計量組成物。 如申請專利範圍第丨或2項之光學資料儲存媒體（2〇)，其 中該金屬反射層（3)包括金屬銀。 如申巧專利範圍第2項之光學資料儲存媒體（2〇)，其中該 透明層（4)的厚度在丨〇至50奈米範圍之間。 如申請專利範圍第4項之光學資料儲存媒體（2〇)，其中該 另一個透明層（8)的厚度在50至250奈米範圍之間。 10·如申吻專利範圍第1或2項之光學資料儲存媒體（2〇)，其 中該記錄層（6)包括元素鍺及碲。 11 · 一種用以高資料率記錄之如申請專利範圍第i , 2,3, 4 ，5，6，7，8，9或10項之光學資料儲存媒體（2〇)之使用 6. 8. 9. 本紙張尺度適用中國國家標準(CMS) A4規格(210 X 297公釐）
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ATE382935T1 (de) 2008-01-15
KR20030024817A (ko) 2003-03-26
WO2002099797A1 (en) 2002-12-12
US20080253272A1 (en) 2008-10-16
DE60224389T2 (de) 2008-12-18
EP1397801A1 (en) 2004-03-17
CA2449122A1 (en) 2002-12-12
EP1397801B1 (en) 2008-01-02
CN1278324C (zh) 2006-10-04

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