TW200414143A - Optical recording and reading system, optical data storage medium and use of such medium - Google Patents

Optical recording and reading system, optical data storage medium and use of such medium Download PDF

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Publication number
TW200414143A
TW200414143A TW092118494A TW92118494A TW200414143A TW 200414143 A TW200414143 A TW 200414143A TW 092118494 A TW092118494 A TW 092118494A TW 92118494 A TW92118494 A TW 92118494A TW 200414143 A TW200414143 A TW 200414143A
Authority
TW
Taiwan
Prior art keywords
stack
recording
optical
data storage
storage medium
Prior art date
Application number
TW092118494A
Other languages
English (en)
Inventor
Bob Van Someren
Ferry Zijp
Hans Willem Van Kesteren
Martinus Bernardus Van Der Mark
Cornelius Antonius Van Den Heuvel
Adrianus Verschuren Coen
Original Assignee
Koninkl Philips Electronics Nv
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Publication date
Application filed by Koninkl Philips Electronics Nv filed Critical Koninkl Philips Electronics Nv
Publication of TW200414143A publication Critical patent/TW200414143A/zh

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Classifications

    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/122—Flying-type heads, e.g. analogous to Winchester type in magnetic recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10532—Heads
    • G11B11/10534—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G11B11/10584—Record carriers characterised by the selection of the material or by the structure or form characterised by the form, e.g. comprising mechanical protection elements
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
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    • G11B11/10589—Details
    • G11B11/10593—Details for improving read-out properties, e.g. polarisation of light
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    • 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
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    • G11B7/24059—Light transmission layers lying on the light entrance side and being thinner than the substrate, e.g. specially adapted for Blu-ray® discs specially adapted for near-field recording or reproduction
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    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/1055—Disposition or mounting of transducers relative to record carriers
    • G11B11/10552—Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base
    • G11B11/10554—Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base the transducers being disposed on the same side of the carrier
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    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
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    • G11B11/1058—Flying heads
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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
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    • 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
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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    • G11B7/2585—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 aluminium

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)

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200414143 玖、發明說明： 【發明所屬之技術領域】 本發明係關於一種與一光學資料儲存媒體配合使用的光 學§己錄與項取系統’該系統包括： 該媒體，其具有一記錄堆疊以及一覆蓋堆疊，該覆蓋堆疊 對於波長為a的聚焦輻射束是透明的，該覆蓋堆疊的厚度= dT，該記錄堆疊與覆蓋堆疊依次形成於一基板上， 一光學頭，其具有的一物鏡具有一數值孔徑NA，在記錄 過程中，該聚焦輻射束從該物鏡中發射出來，該光學頭適於 以一小於50 μπι的自由工作距離、從該媒體的一最遠表面記 錄/讀取，其配置於該光學資料儲存媒體的該覆蓋堆疊側上。 本發明進一步係關於一光學資料儲存媒體，其具有一記錄 堆豐與於波長為Α的聚焦輻射束而言係透明的覆蓋堆疊，該 覆蓋堆疊厚度為dT，該記錄堆疊與該覆蓋堆疊依次形成於一 基板上。 本發明進一步係關於該系統中該媒體的使用。 【先前技術】 本文開頭所提及類型之一系統的一具體實施例係從歐洲 專利申請案EP 0878793 A2中得知。 該系統中的光學資料儲存媒體可包括一厚度在〇.6與1.2 mm間的透明基板。諸如磁光碟片的媒體可進一步包括一透 明介電薄膜，藉由所謂的喷濺法或透明基板表面上的真空沈 積操作，由氮化矽、氮化鋁、氧化矽與/或ZnS形成。磁光記 錄層包括非晶性稀土金屬磁性薄膜，如TbFeCo、GdFeCo、 86488 -6- 200414143
DyFeCo或TbFeCoCr，或諸如PtCo的垂直記錄薄膜，其可藉 由噴濺或真空沈積操作來記錄或形成；一以鋁為基礎的金屬 反射薄膜，主要包括A卜AlTi或AlCi*，其可藉由噴濺或真空 沈積操作形成；以及一透明的uv可固化樹脂保護層，其可 藉由所謂的旋轉塗佈操作形成。 為了在上述磁光記錄媒體中記錄資訊，光從光學頭中輻射 穿過厚度為0·6至1.2 mm之間的透明基板，至記錄堆疊，以 將層加熱至記錄溫度。同時，磁頭從該透明基板的反面施加 磁場。藉由使用磁場調變裝置，可用資訊調變該磁場。結果 資訊可記錄在記錄媒體上。為了從磁光記錄媒體複製資訊， 光學系統輻射出的光穿過透明基板。在此情況下，光學頭係 配置於碟片的透明基板一側。 在該等第4代光學系統中，為了提高記錄密度，即聚焦輻 射束的光斑大小，物鏡的數值孔徑（NA)大於〇8〇。儘管存在 物鏡大小（NA)增加之趨勢，對高資料率與存取時間的需求增 加使物鏡的總質量縮小。這只有當焦距與自由工作距離 working distance ; FWD)減少的時候才有可能實現。但若自 由工作距離減少，則透明基板（聚焦輻射束從中經過）的厚度 亦需要減少。此外，若NA增加，則媒體表面相對於光學系 統（傾角）的光學軸從垂線偏移的容許角度在透明基板厚度所 引起的雙重折射或像差的影響下會減少。在高1^入情況下， 傾角的效果的減少係減少透明基板厚度的另一原因。厚度減 少的透明基板亦稱為覆蓋基板或更多地稱為覆蓋堆疊。因 此，第4代光學記錄中較薄覆蓋廣的用途主要係保護記錄堆 86488 200414143 疊免受損壞，並實現低自由工作距離。 另一個對小自由工作距離的爭議係，磁光資料儲存媒體的 線圈的大小。若想系統具有高資料率，則需一大頻寬來調變 經過線圈的電流。對100至200 Mbit/#等級的資料率而言， 為了定義場之切換特性中的陡側面，經過線圈的電流的切換 頻率必須為至少1至2GHz。這就需要一自我電感小、電阻低 且寄生電容小之線圈。除去線圈之速度，線圈的功率消耗亦 是個問題。因此，較佳的係，制内徑小，如小於⑽叩的 小線圈。使用較大的線圈會影響資料率與能量效率，因為較 大的線圈的電感較大，功率消耗較高。線圈越接近表面，資 料儲存媒體上的磁場調變的能量效率越多。但該小線圈每= 培15 kA/m等級的磁場只能貫穿數十微米的空間，所以線圈 必須接近記錄堆疊，且右厘你丨m & *且丑有厚於（例如）100 μιη的覆蓋層對苴進 行保護二從砂0878793入2所知之系統具有一厚度小於⑽ μπι的覆盍層。中請人已發現此類較厚的覆蓋層，例如_ 或25 μιη會引起不可靠資料記錄與讀出。光學頭聚隹於覆蓋 層的外表面上’在該層中不可能進行資料記錄與讀出，而且 在此H學頭必須在隨後表面上重新聚焦。而該重新聚 焦的程序會導致:㈣流巾斷，㈣導^可靠的資料記錄盘 讀取。此外，較厚的覆蓋層需要磁線圈的線圈轴向之磁場距 離範圍較大’其能限制線圈的切換速度，從而限制較大資料 率時的記錄可靠性。 【發明内容】 本發明的目的係提供—插‘ 音-s I：ir 杈供種如文早開頭段落所述之系統，其 86488 200414143 能在記錄堆疊中實施可靠資料記錄與讀出。 本杳明的第二個目的係提供一種如文章開頭段落所述類 型之系統中所使用的、用於可靠記錄與讀出資料的光學資料 儲存媒體。 該等目的係依據本發明，藉由一光學記錄與讀取系統實現 的，該系統的特徵係dT小於50 ；1。厚度dT選擇的重要特徵係 聚焦驅動系統的穩健性。若使用具有一覆蓋堆疊，即i或多 層，厚度約為20 μιη或更大的媒體，該系統的聚焦誤差曲線 會具有兩個零交點，其會導致聚焦伺服器鎖定至覆蓋堆疊表 面，而非記錄堆疊表面。在圖3中，額外的零交點由曲=33 表示。但若使用較薄的覆蓋堆疊，則聚焦誤差曲線不會顯示 額外的零交點，因此，若使用此種薄覆蓋堆疊媒體，則能避 免聚焦飼服器的錯誤鎖定。圖3中，覆蓋堆疊較薄的媒體的 聚焦誤差曲線由曲線31表示。由於此聚焦祠服器的問題，最 好係選用較薄的覆蓋堆疊。其優點係，使用較薄的硬覆蓋堆 疊能避免覆蓋堆疊的損壞。 此類較薄覆蓋堆疊的另一優點係，磁線圈能置於距離記錄 堆疊足夠近的地方，以在記錄堆疊中產生足夠之磁場。 已進-步發現，在記錄過程中，來自媒體的污染物會蒸發 並凝結於光學頭的光學裝置上。該污染物可以係（例如）混合 有少量其他污染物的水。含有其他污染物的水可能 (單）層形態呈現於媒體的外表面上。若無覆蓋堆叠，則 層極靠近記錄堆疊’並由記錄堆疊間接加熱後蒸發，隨後合 凝結在含有其他污染物的物鏡上。這個過程發生較快，即: 86488 200414143 半個小時内（但亦有可能在數秒後），其會引起系統的不可靠 =錄與讀取，並最終導致整個記錄與讀取輯。應用較薄覆 舰的另U係’其志避免在物鏡上積聚污染。原因在於覆 座層構成了有效阻障，其能避免加熱、蒸發媒體上的薄單 層。已發現，在厚度在〇.5iL1 μιη或更大的較薄覆蓋堆疊上 不會出現有害效果，即蒸發。使用基板與覆蓋堆疊(見圖5) 之間的記錄堆疊之㈣束來熱模擬加熱程序，以此計算厚 度。 在-項具體實施例中，光學頭進一步包括一磁線圈，該線 圈配置在最接近覆蓋堆疊的光學頭—側，以便光學頭的光學 軸月匕橫貝磁線圈中央，而且光學資料儲存媒體的記錄堆疊為 磁光型。在此情況下，高密度、高資料率的可靠磁光記錄成 為可能，因為高ΝΑ，即小光斑已成為可能，且磁線圈可置 於最接近記錄堆疊之位置，在此情況下，磁場可以能量效率 之方式調變。 田磁線圈的内徑小於6〇 μιη時，該優點更為突出。因較大 線圈的電感較大，功率消耗更高，使用較大之線圈會影響資 料率與能量效率。 在光學資料儲存媒體的一項具體實施例中，^的範圍係 根據以下公式，視>^與4單位為μιη)而定·心< i(u/na 。 最佳的精確厚度範圍係依據光學系統的特性，諸如物鏡的 ΝΑ以及輻射束的波長。較薄覆蓋堆疊光學資料儲存媒體的 ΝΑ通常大於〇.8〇。在覆蓋堆疊中的聚焦輻射束光學干擾影響 開始在記錄過程中的資料記錄與讀取可靠性中顯示其負面 86488 -10- 200414143 影響時的厚度為dTmin，而較佳的厚度是^於該厚度。厚度 dTmin與所謂的共焦參數成正比：a/na2。 在光學資料儲存媒體的另一具體實施例中，一額外抗反射 堆疊與覆蓋土隹疊在距離基板最遠的一側㈣。其優點係，在 媒體外表面輻射束能量的損失較少。此外，來自外表面的聚 焦誤差信號的強度實質上降低，因此鎖定於外表面層而非記 錄堆疊的可能性較小。較佳的係，抗反射堆疊包含選自由 Ta〇2、Si〇2、SiN以及MgF2所組成之群組的層。 【實施方式】 圖1A與1B所示的係一種與光學資料儲存媒體5配合使用 的光子ό己錄與_取系統。媒體5包括一記錄堆疊9以及一對於 聚焦輻射束1為透明的覆蓋堆疊7。該輻射束丨的波長^為4〇5 nm。該覆蓋堆疊7的厚度dT = 3.1 80 μιη。該記錄堆疊9與覆蓋 堆疊7依次形成於一基板8上，例如藉由喷濺法。一光學頭3， 其物鏡2具有數值孔徑ΝΑ=0·85，在記錄過程中聚焦輻射束1 從該物鏡中發射出來，該物鏡位於該光學資料儲存媒體5的 覆蓋堆疊7的一侧。光學頭3適於以自由工作距離dF = 1 5 μπι 從媒體5的最外表面記錄/讀取。額外抗反射堆疊11位於覆蓋 堆疊7上距離基板8最遠的位置。抗反射堆疊η包含選自 Ta02、Si02、SiN以及MgF2的層。而後者不如前三者穩健。 適當覆蓋堆疊的設計，按如下順序（例如）係： 設計1 卜基板8) (-記錄堆疊9) 86488 -11 - 200414143 -3 μιη的UV可固化樹脂或塑膠PSA薄片10(折射率n = 152) -11 nm Ta02 (η = 2.35) -21.6 nm Si02 (n = 1.46) -79 nm Ta〇2 -68 nm Si02 0 另一設計係： 設計2 (-基板8) (-記錄堆疊9) -3 μηι的UV可固化樹脂或塑膠PSA薄片10 -17.7 nm SiN (η = 2.04) -23.1 nm Si02 -86 nm SiN -68.8 nm Si〇2 0 應注意，在設計1與設計2中，抗反射堆疊11包含4個層， 當輻射束的外部實質上非垂直入射，例如60至70度（當使用 例如0.90的高NA時）時尤其適合。 另一設計係： 毁計3 (、基板8) (、記錄堆疊9) •3 μπι的UV可固化樹脂或塑膠PSA薄片10 -75.4 nm Ta02 (η = 2.04) 、48·4 nm Si〇2 86488 -12- 200414143 在設計3中，抗反射堆疊11包含2個層，當使用例如小於 〇·50的較低NA時尤其適合。 可使用諸如旋轉或浸入塗佈、汽相沈積技術以及塑膠箔/ 黏合劑組合’例如壓力敏感黏合劑（pressure sensitive adhesive ; PSA)來製造覆蓋堆疊7。 光學頭3進一步包括一磁線圈4，該線圈配置在最接近覆 蓋堆疊7的光學頭3的一侧。光學頭3的光學軸橫越磁線圈4的 中央’且光學資料儲存媒體5的記錄堆疊9係磁光型。記錄堆 疊9可（例如）依次包括一本技術中熟知的鋁反射金屬層、其他 輔助層、一 50 nm的磁性材料GdFeCo層與一 35 nm的SiN或 ZnS/Si〇2干擾層。使用TbFeCo作為磁性材料替代GdFeC〇取 得的效果相似。若媒體5不具有覆蓋堆疊7，則污染會在數分 鐘内積聚（見圖4)，從而導致伺服器，例如聚焦或追蹤故障。 由於覆蓋堆豐較薄，且在聚焦誤差曲線中並未出現雙重零交 點，所以形成了可靠記錄與讀取（見圖3)。該系統證明係穩定 且穩健的。若存在依據本發明之覆蓋堆疊7，則不會觀察到 積聚於物鏡上的污染物。 圖2所示的係與磁線圈的軸向距離的磁場強度。該曲線圖 說明典型高速線圈的工作距離範圍只有數十微米的原因。 圖3所示的係三條聚焦誤差曲線31、32以及33。曲線31 (實 線）對應於4μπι，曲線32(點虛線）對應於8μιη，曲線33(虛線） 對應於25 μπι的覆蓋堆疊u的厚度。應注意，當覆蓋為25 左右時候的額外零交點。垂直線表示各種情況下的焦點之位 置〇 86488 -13- 200414143 圖4A所示的係依然清潔的物鏡3的光學表面，圖4B所 係污染積聚後的光學表面，該污染由不包含覆蓋堆疊7的媒
體的已蒸發污染物的再沈積而積聚。覆蓋堆疊的應用解決了、 污染積聚的問題。 N 圖5所示的係熱模擬之結果。在記錄堆疊中，溫度恢復正 常至1。與包含覆蓋層(堆疊)7的溫度分佈相對應的實線所示 的係在僅半μιη内溫度的快速衰退。從中可推斷得知，在一厚 度為半或更大的覆蓋上，已獲得有效的熱絕緣。 子 應注思，以上提及的具體實施例係用以解說本發明而非限 制本發明，熟習技術人士可設計很多替代的具體實施例而 不致脫離隨附时請專利範圍的範轉。在中請專利範圍中， 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 圍用包含」亚不排除那些在申請專利範圍所列出之外 的元件或步驟。在-元件之前的用語「―」並不排除複數個 這種元件的存在。唯—的事實為在彼此不同的相關中請專利 範圍所引用的某些度量並不代表不能為了較佳的用途而使 用這些測量的組合。 依據本發明，說明了一種與光學資料儲存媒體配合使用的 ?學記錄與讀取系統。該系統包括該媒體，其具有一記錄堆 噓以及-覆盍堆疊’其對於空中波長為乂的聚焦輻射束透明。 該覆盍堆豐的厚度為dT。該記錄堆疊與覆蓋堆疊依次形成於 基板上。一光學頭，其物鏡的數值孔徑& NA，在記錄過 ’聚焦輻射束從該物鏡，發射出來，其適於從該媒體的 最遠表面以小於50 μηι的自由工作距離心記錄/讀取，其配置 86488 200414143 在該光學資料儲存媒體的覆蓋堆疊側。若dT小於50 A，則可 獲得可靠之記錄與讀取，尤其係因解決了聚焦伺服器的問 題。 【圖式簡單說明】 本發明已藉由範例性具體實施例及參考所附圖式來詳細 說明，其中 圖1A所示的係依據本發明的系統的具體實施例，其具有在 磁光驅動器中使用的工作距離較小的光學裝置， 圖1B所示的係，圖1A中媒體的層堆疊之結構， 圖2所示的係磁場強度，以與磁線圈的距離為函數， 圖3所示的係不同覆蓋堆疊厚度的聚焦誤差曲線， 圖4A所示的係初次記錄前，光學頭的物鏡之光學表面以 及， 圖4B所示的係污染積聚後的光學表面。 圖5所不的係2方向具有與不具有覆蓋層的溫度分佈之模 擬結果。 ' 【圖式代表符號說明】 1 聚焦輻射束 2 物鏡 3 光學頭 4 磁線圈 5 光學資料儲存媒體 7 覆蓋堆疊 8 基板 86488 -15- 200414143 9 10 11 31 記錄堆疊 塑膠PSA薄片 抗反射堆疊 32、33 曲線 86488 16

Claims (1)

  1. 200414143 拾、申請專利範圍： 種與一光學資料儲存媒體配合使用的光學記錄與讀取 系統，該系統包括： 該媒體，其具有一記錄堆疊與一覆蓋堆疊，該覆 1 V. * 且 丁於一具有空中波長^的聚焦輻射束係透明的，且具有一 厚度dT，該記錄堆疊與覆蓋堆疊依次形成於一基板上， =一光學頭，其物鏡具有一數值孔徑NA，在記錄過程中， 該聚焦輻射束從該物鏡中發射出來，其適於以一小於 μπι的自由玉作距離dF從該媒體的—最遠表面記錄/讀取， 且配置在該光學資料儲存媒體的該覆蓋堆疊側，其特徵係 dT小於50义° 2. 如申清專利範圍第1項之系統，其中，該光學頭進一步包 括一磁線圈，該磁線圈配置於最接近該覆蓋堆疊的該光學 頭的一侧，以便該光學頭的一光學軸能貫穿該磁線圈的中 央，且該光學資料儲存媒體的該記錄堆疊為磁光型。 3. 如申請專利範圍第2項之系統，其中，該磁線圈具有一小 於60 μπι的内徑。 4. 如申請專利範圍第⑴項中任—項之系統，其中&的範圍 係根據以下公式，視NA而定：dT<1〇/i/NApm。 5. -種具有-記錄堆疊與—覆蓋堆疊之光學資料儲存媒體， 該覆蓋堆疊對於具有-波長乂的_聚焦㈣束而言係透明 的’該覆蓋堆疊之厚度為dT，該記錄堆疊與該覆蓋堆疊依 次形成於一基板上，其特徵為dT小於5〇λ pm。 6. 如申請專利範圍第5項之光學資料儲存媒體，其中，其中 86488 d丁的範圍係根據以下公式 μηι 〇 視 ΝΑ與 a 而定：dT < i〇;l/Na 7.如申請專利範圍第6項之光學資料儲存媒體，其中，在該 ^蓋堆疊中的該聚純射束之光學干擾影響開始在記錄 =程中的資料記錄與讀取可靠性中顯示其負面影響時的 厚度為dTmin，而dT大於該厚度。 8’如申請專利範圍第5項之光學資料儲存媒體，其中，一額 =反射堆疊位於該覆蓋堆疊上距離該基板最遠之-位 9·如申請^範圍第8項之光學資料儲存媒體，其中，該抗 隹且L括選自由Ta〇2、Si〇2、Si^MgF2所組成之群 組的層。 10.-種使用如申請專利範圍第5至9項中任一項之光學資料 儲存媒體以進行如申tf專利職第i至4項中任一項 統中的可靠記錄與讀取之使用。 /、 86488
TW092118494A 2002-07-10 2003-07-07 Optical recording and reading system, optical data storage medium and use of such medium TW200414143A (en)

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