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TWI289834B - Rewritable optical record carrier - Google Patents

Rewritable optical record carrier Download PDF

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Publication number
TWI289834B
TWI289834B TW092134876A TW92134876A TWI289834B TW I289834 B TWI289834 B TW I289834B TW 092134876 A TW092134876 A TW 092134876A TW 92134876 A TW92134876 A TW 92134876A TW I289834 B TWI289834 B TW I289834B
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Taiwan
Prior art keywords
layer
recording
record carrier
optical record
dielectric layer
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TW092134876A
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English (en)
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TW200414164A (en
Inventor
Andrei Mijiritskii
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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
    • G11B7/242—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
    • G11B7/241—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
    • 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
    • G11B7/242—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
    • G11B7/253—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
    • 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
    • G11B7/252—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
    • G11B7/252—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
    • G11B7/24—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
    • G11B7/253—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
    • G11B7/2534—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 polycarbonates [PC]

Landscapes

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

Description

1289834 玖、發明說明： 【發明所屬之技術領域】 本發明與包含一記錄層堆疊之一可重複寫入式光學記錄 載體有關，該記錄層堆疊具有一第一介電層（L)、包含一相 位改變（phase-change; PC)記錄材料之一記錄層及一第二介 電層（12)。 【先前技術】 所有已知的可重複寫入式光學記錄媒體如CD-RW、 DVD-RAM、DVD-RW、DVD+RW、及藍光光碟（Blu-ray Disc ，BD)都應用包含該相位改變記錄堆疊之一記錄堆疊。pc 層一般係夾入兩介電ZnS-Si〇2層之間一堆疊中。目前，為 可抹除式相位改變記錄選擇的媒體係具有耐用多晶結構之 一合金，如由Sb與Te附加In、Ge及/或Ag所組成之一合金。 在該記錄堆疊之一侧（I2·侧）上置放通常由金屬如金、銀或 銘製成之一鏡層。在CD/DVD中，置放記錄堆疊使其另一 側（Ii -側）位於一基板如聚碳酸醋基板上且一覆蓋層係附著 於鏡層之相反側上。依據記錄信號所調變之一寫入雷射光 束從基板側（首先從L-侧）進入記錄媒體。在BD中，置放記 錄堆疊使其鏡層側（If側）位於一基板上且一覆蓋層係附著 於記錄堆疊之與鏡層相反之側（L-側）上。寫入雷射光束接 著從此側（首先從I!-側）進入記錄媒體。 兩種情形中光束都聚焦於記錄堆疊上。雖然碟片與聚焦 雷射光束移動有關，但是聚焦雷射光束主要由記錄層吸收 。因而，合金係局部受熱。當溫度超出合金溶點（大約5〇〇 90020.DOC -5- 1289834 C至7 Ο 0 C )達某一時間週期時，相位改變材料轉換為非晶 性狀態。透過鄰近介電層之快速熱消耗使得合金迅速冷卻 ，因而穩定非晶性相位。因而，已寫入標記仍沿著磁軌。 應用功率已降低之一雷射光束允許抹除已寫入標記。因而 ，記錄層加熱到大約200。(：的溫度時導致相位改變返回晶體 相位。由於原子處於咼溫時間必須足夠長以便再結晶，故 結晶係一相當緩慢的程序，儘管PC媒體中的非晶化可以非 常快速。 通常地，堆疊具有咼至低之一信號極性，即堆疊在晶體 相位（基怨）中具有較鬲反射率而非晶性相位（寫入狀態）中 的反射率降低。因而，聚焦於該記錄堆疊上之讀取光束在 堆疊處反射，反射強度視該光束照射於一已寫入非晶性標 0己（凹卩曰）或一非窝入晶體區域（平臺）而不同。 因而，介電層與反射層執行數個任務：保護記錄層免遭 機械損傷、建立已光學調諧從而具有最佳化的反射率及/ 或吸收率（光學性能）之一結構、允許訂製碟片之熱特性用 於快速冷卻且最好的保護免遭熱損傷。 如圖3中所示，光學性能週期性地取決於第一介電層厚 度山。特定言之，非晶性與晶體反射在di某些值處具有最 小與最大位準。週期性可表示如下 d1=(m*X)/(23|en) ⑴ 其中m係一整數，λ表示雷射光之波長且η*〗!層材料之折 射率。光學對比度（為晶體與非晶性反射之間之差異藉由曰 體反射正規化而產生）因而隨相同的週期性變化。
90020.DOC 1289834 pc層顯示晶體狀態與非晶性狀態中的不同折射率。因而 ，P C層與鄰近介電層之間折射率失配（係造成反射率的原 因）引發非晶性與晶體反射率之間一相移。在圖3所示高至 低信號極性之情形中，最好選擇L層之厚度山使得非晶性 反射接近最小值。晶體基態區域（平臺）處所反射光的強度 占入射光束之百分比由正方形指示。三角形指示非晶性已 窝入狀態區域（凹陷）處所反射光之百分比。圓形指示晶體 與非晶性狀態之間之光學對比度之百分比，其中光學對比 度表示當入射光束照射一凹陷處時所反射光之已藉由晶體 狀態之反射而正規化之衰減。因而，當非晶性反射接近最 小值時獲仔取大的光學對比度且因而獲得最好的信號調變 。十字形指示晶體與非晶性狀態之間的光學相移。因而， 依據圖3，光學性能之第一近似值並不依賴光學對比度最 大值之等級。在此範圍内，m係一任意參數。 然而，由具有一傳統光學寫入頭之寫入裝置產生之雷射 光束經聚焦具有較短一焦距。光束之入射角在入射點橫跨 其寬度變化，參見圖4。在圖4中，401表示聚焦前之一雷射 光束，402係一聚焦透鏡，403係聚焦後之一會聚雷射光束 ’ 404係垂直於記錄堆疊4〇6之表面4〇5之雷射光束（4〇ι、 403)之中心線，407係入射角（α)，更精確言之係聚焦光束 中一射線與法線入射之間的角度。例如，BD系統會聚雷射 光束之平均角度α係大約35。。 藉由此方式，透過介電層之有效光路徑Uff依據下式隨角 度α變化.
90020.DOC 1289834
Uff(a)= l〇/cos(a) (2) 其中l〇表示表面法線方向之光路徑。如等式2中所示，對於 預定之法線方向路徑長度1〇而言，有效路徑長度隨角度a之 增大而增加。例如，若所考慮角度為3 5。，則有效路徑長度 <增量等於22%。路徑長度之差異 Δ1 = l〇*(l/cos(a)-l) (3) 依/人引發相移及碟片光學性能惡化。即，介電層越薄，光 學性能調整越好。因而，就光學性能而言，選擇第一介電 層之厚度A使其盡可能薄或從反射最小之意義上選擇山使 其最小（m=l)。 可寫入式光學記錄載體之資料容量有改良性增加的同時 ’物鏡之數值孔徑增加且同時雷射波長減小。例如，總的 資料容量從650 MB(CD，ΝΑ=0·45, λ=780 nm)增加到 4.7 GB (DVD，ΝΑ=〇·65，λ=670 nm)，最後可達到 25 GB(BD，ΝΑ =0·85, λ=405 nm)。在BD-系統中，第一介電層之通常厚度 僅為大約40 nm以獲得可接受的光學性能。最後，對於採用 更短波長之UV-記錄，I!層必須更薄。 但是就熱保護觀點而言，一方面保護記錄層之第一介電 層另一方面保護（聚碳酸酯）基板（CD/D VD)或覆蓋層（BD) 免遭熱損傷。若所選取的介電層太薄，則寫入/抹除時所產 生且到達基板/覆蓋層之熱不能充分減少。基板/覆蓋層之 介面處所獲得之溫度因而可超過基板/覆蓋層材料之熔化 溫度從而損傷光學記錄載體。此損傷導致讀取信號惡化且 雜訊與錯誤率增加。因而選擇第一介電層使其充分厚。或
90020.DOC 1289834 者從反射最小之意義上選擇山使得最小為m〉l。因而使鄰 近基板（CD/DVD之情形中）或鄰近覆蓋層（BD之情形中）之 熱保護最佳化且使光學性能最佳化係矛盾的。 因而，本發明之一目的為，提供所含之堆疊設計具有良 好光學特性因而提供充分的熱保護之一可重複寫入式光學 記錄載體。 【發明内容】 依據本發明之一第一方面，藉由如開始段落中所述之可 重複寫入式光學記錄載體達成此目的，其特徵在於鄰近第 一介電層配置一熱阻障層。 依據由本發明之第一方面進一步發展之一第二方面，可 重複寫入式光學記錄載體進一步包含承載該層堆疊之一基 板’該熱阻障層配置於該第一介電層與該基板之間。 依據由本發明之第二方面進一步發展之一第三方面，該 熱阻障層之折射率係接近該基板之折射率。 依據由本發明之第一方面進一步發展之一第四方面，記 錄載體進一步包含附著於該熱阻障層之一覆蓋層。 依據由本發明之第四方面進一步發展之一第五方面，該 熱阻障層之折射率係接近該覆蓋層之折射率。 " 依據由本發明之第二或第三方面進一步發展之一第二^ 面，該基板材料係聚碳酸§旨或聚f基科酸甲酷（PMMA、): 依據由本發明之第四或第五方面進一步發展之—第七？ 面該覆二層材料係聚碳酸酿或透明聚合樹脂。 依據由本發明之第一至第 1 万面進一步發^
90020.DOC 1289834 之一第八方面 要成分。 該熱阻障層㈣包含㈣2或_3作為其主 依據由本發明之筐—$楚 、 、一# 至弟八万面之任一方面進一步發展 =弟九万面’該等第一與第二介電層材料包含以下成分 Μ、Sl02、Sl3N4、Al2〇3或丁心〇5之-或其混合物。 =由本發明之第_至第九方面之任—方面進—步發展 '第十方面，忒相位改變記綠材料包含Ge、In、Sb及Te 之一混合物。 【實施方式】 如圖1中所示，依據本發明之一第一具體實施例之可重複 寫入式光學記錄載體100包含由第一介電^層114、第二介 电I2層116以及夾入兩者之間的一記錄]?(：層112所組成之一 记錄堆疊110。介電層材料可包含以下成分之一或其組合：
ZnS、Si02、Si3N4、Al2〇3 或 Ta205，如（ZnS)8〇(Si02)2〇。PC 層可由Sb與Te附加In、Ge及/或Ag組成如GeInSbTe。在記 綠載體100頂部，沿著如箭頭118所示入射光束方向可看到 一基板120’其通常由聚碳酸酯或PMMA或類似物製成。熱 阻障層122係沈積（顛倒說明）到基板上。依Ii-PC-h次序將 記錄堆疊層110壓薄到（以下說明）阻障層上。因而，鄰近與 PC層對立之h層配置作為一良好絕熱體之阻障層，因而從 記綠PC層112橫跨1層114朝基板120傳播之熱減少。包含鋁 、銀或金或其混合物如具有若干百分比的Ti或金之A1之 鏡層124係沈積到（以下說明）ι2層116上，因而形成一MIPI-堆疊。鏡層124最後可採用由聚碳酸酯或透明聚合樹脂/油 90020.DOC -10- 1289834 漆如Sylgard 184或類似物製成之一層126覆蓋以保護鏡層 免遭機械損傷。依據圖1之配置遵循可重複寫入式Dvd-及 可重複窝入式CD-之標準堆疊設計。 圖2所示依據本發明之一第二具體實施例之可重複寫入 式光學€錄載體200通常遵循BD堆疊設計，其中鏡層2 2 4 係（自底向上）沈積到一基板226上。記錄堆疊21 〇係依 I^PC-Ii次序沈積到鏡層上。阻障層222係附著於記錄堆疊 2 10之1層214。最後採用覆蓋層220覆蓋阻障層。此情形中 箭頭218所示入射光束進入堆疊之覆蓋層側上。 在依據圖1與圖2之具體實施例中，l-層都可包含一多層 結構，其中Ii-多層離相位改變層最遠之子層具有不同於基 板/覆蓋層之折射率。 在寫入/抹除雷射光束之給定波長條件下選擇兩具體實 施例中的阻障層材料使其折射率充分接近基板/覆蓋層之 折射率。例如，當第二具體實施例如BD_系統中所給定之 覆盍層材料為聚碳酸酯或Sylgard 184且雷射光束之波長為 405 xim時，覆蓋層材料之折射率為15。因而適合阻障層122 之材料可為Si〇2，其在波長為405 nm時也具有1.5的折射率 且包含相對較低的特定熱傳導率。接著可藉由簡單選擇阻 障層122之一適當厚度調整熱絕緣而不惡化堆疊之光學性 月b。Al2〇3亦為阻障層122之一適當材料。此外阻障層可為 一多層結構。因而，込層厚度可根據最佳光學及熱性能之 需要而盡可能地薄。 應明白，本發明不限於上面較佳具體實施例。可應用其
90020.DOC -11 - 1289834 他記錄層材料、介電層材料、熱阻障材料、反射層材料、 料及/或覆盍層材料。此外，本發明不限於具有如上 述一單一知攸 p綠層配置之光學記錄載體。包含具有依據本發 明之光學特性令+伽+工/ <兩個或兩個以上紀錄層之多記錄層配置亦 可提供。因而，可柯μ r j ί疋供如上述兩個或更多記錄堆疊，其中 兩個或僅—個包含一阻障層。 【圖式簡單說明】 \^ϊ )L fc 卜 上與其他目的、特徵及優點已從上面結合附 圖所說明之較佳具體實施例中明白，其中 圖1顯示依據本發明之-第-具體實施例之可重複寫入 式光學記錄載體之斷面圖； 圖2顯示依據本發明之-第二具體實施例之可重複窝入 式光學記錄載體之斷面圖； 圖3顯示依賴於第一介電層厚度之光學性能；及 圖4說明會聚雷射光束之光學路徑。 【圖式代表符號說明】 100 〜200 110 、 210 112 114 、 214 116 118 可重複寫入式光學記錄載體 兒綠層堆疊 記綠PC層 第一介電層 第二介電層 箭頭 120 、 226 基板 122 、 222 阻障層
90020.DOC -12- 1289834 124 、 224 鏡層 126 層 220 覆蓋層 401 雷射光束 402 聚焦透鏡 403 會聚雷射光束 404 中心線 405 記錄堆疊之表面 406 記錄堆受 407 入射角 90020.DOC -13-

Claims (1)

1289834 拾、申請專利範圍： 1· 種包含一記錄層堆疊（110、210)之可重複寫入式光學 z錄載體（100、200)，該記錄層堆疊具有·· 一第一介電層（114、214), 一紀錄層，其包含一相位改變記錄材料，及 一第二介電層（116、216)，其特徵在於鄰近該第一介 電層配置一熱阻障層（122、222)。 2·如申請專利範圍第1項之可重複寫入式光學記錄載體， 其特徵在於進一步包含承載該層堆疊之一基板（12〇)，該 熱阻障層配置於該第一介電層與該基板之間。 3.如申請專利範圍第2項之可重複寫入式光學記錄載體， 其特徵在於該熱阻障層之折射率係與該基板之折射率接 近。 4·如申請專利範圍第丨項之可重複寫入式光學記錄載體， 其特徵在於進一步包含附著於該熱阻障層之一覆蓋層 (220) 〇 5·如申請專利範圍第4項之可重複寫入式光學記錄載體， 其特徵在於該熱阻障層之折射率係與該覆蓋層之折射率 接近。 6·如申請專利範圍第2或3項之可重複寫入式光學記錄載 體’其特徵在於該基板材料係聚碳酸酯或PMMA。 7·如申請專利範圍第4或5項之可重複寫入式光學記錄載 體’其特徵在於該覆蓋層材料係聚碳酸酯或透明聚合樹 脂0 90020.DOC !289834 •如申請專利範圍第卜2、3、4或5項之可重複寫入式光學 A錄載體，其特徵在於該熱阻障層材料包含Si〇2或Abo〕 作為其主要成分。 9·如申請專利範圍第卜2、3、4或5項之可重複寫人式光學 己錄載aa其特徵在於該等第一與第二介電層材料包含 以下成分之一或其混合物：ZnS、Si〇2、以3〜、Al2〇3或 Τθ.2〇5 0 心申請專利範圍第^ +⑷項之可重複寫入式光學 '•己錄載體’其特徵在於該相位改變記錄材料包含&、化 、Sb及Te之一混合物。 90020.DOC
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