TWI246683B - High-density readable only optical disk - Google Patents

High-density readable only optical disk Download PDF

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Publication number
TWI246683B
TWI246683B TW092126301A TW92126301A TWI246683B TW I246683 B TWI246683 B TW I246683B TW 092126301 A TW092126301 A TW 092126301A TW 92126301 A TW92126301 A TW 92126301A TW I246683 B TWI246683 B TW I246683B
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Taiwan
Prior art keywords
density
rom
mask layer
metal
substrate
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TW092126301A
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English (en)
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TW200405307A (en
Inventor
In-Oh Hwang
In-Sik Park
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Samsung Electronics Co Ltd
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Publication of TW200405307A publication Critical patent/TW200405307A/zh
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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
    • 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
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    • 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
    • G11B2007/25706—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 transition metal elements (Zn, Fe, Co, Ni, Pt)
    • G—PHYSICS
    • 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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    • 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)
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    • 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
    • G11B2007/25713—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 nitrogen
    • G—PHYSICS
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    • 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
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    • 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
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    • 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
    • G11B2007/25716—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 sulfur
    • 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
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    • 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
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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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    • G11B7/24—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
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    • 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]
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    • G11B7/2535—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 polyesters, e.g. PET, PETG or PEN
    • G—PHYSICS
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    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/146—Laser beam

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Nanotechnology (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Optical Recording Or Reproduction (AREA)

Description

1246683 --------MM_92126301-年 I 〇 月 IR a_修正___ 五、發明說明（1) 本申請案主張韓國專利申請號2〇〇2 —59 1 39之優先權， 該案已於20 02年4月23日以及2 0 0 2年9月28日向韓國專利局 提出申請，該案之所有揭露内容於此併入參考。 【發明所屬之技術領域】 本發明係有關於一種光碟，且特別是有關於一種具有 超解析近場結構（super resolution near· field structure)的高密度可唯讀光碟，其可讀取尺寸小於雷射 光束解析度之標記（marks)。 【先前技術】 « 相較於目前之磁記錄媒體，由於光碟在每個記錄單元 中的記錄區域較小，故光碟已被廣泛使用於高密度記錄媒 體中。根據其特性，光碟可區分為唯讀記憶型態（R〇M type)、一次寫入多次讀取型態（w〇RM type)，以及可抹除 型態（erasable type)。唯讀記憶體型態的光碟僅能讀取 預先記錄的資料，一次寫入多次讀取型態的光碟僅允許使 用者寫入資料一次，而可抹除型態的光碟則允許使用者抹 除並重新記錄資料於其上。
可記錄光碟（CD-R)即為一次寫入多次讀取型態的光碟 一個例子。在可記錄光碟中，當波常為78〇nm之雷射光束 被聚焦於記錄層上’而此記錄層係由花青（cyanine)以及 鈦花菁（phthalocyanine)等有機染料時，這些有機染料中 的鍵結會被打斷。此時，基材與反射層的結構便產生了光 學性地改變。 在此過程中，資料便被記錄於可記錄光碟中。這些被 吕己I彔m斗需U 1 mW以下之低功率雷射光束讀取。可記錄 1246683 修正 隸 92126301 五、發明說明（2) 量約為65_，因此其已被廣泛使用於各種 恶之貝料的記錄與讀取，如聲音以及影像資料。 然而，光學記錄媒體，例如需要78 0nnl之記錄波長 m碟⑽，或可覆寫光碟⑽_RW)，其儲 :量的光學記錄媒體在今日複雜的多媒體環境二r 波导ί二士述問題，一種需要63〇_68〇nm之較短雷射 數：影音光碟(Dlgltal versatiieDisk，DvD)因 _!”（DVD)的健存容量為U至4.7GB 纪愧數位旦/立：Γ而吕，數位影音光碟（DVD)可區分為唯讀 rV:隨機：：ir/VD_R0M)、可記錄數位影音光碟(dvd- 數位影音光碟（DVD-RW)。可古己=RAM)，以及可覆寫 的記錄動作係透過記錄雷射光音光碟⑽-10上 機染料的鍵結被_而完&。以“ ^吏得記錄層中有 碟（DVD-RAM)以及可覆寫數位影音碟^ 5己憶數位影音光 錄層的相（phase)變化將使得光碟弁風-RW)為例，記 此，資料可以記錄在光碟上或、先子特性改變，也因 的是，可記錄數位影音光碟上抹除。值得注意 與唯讀記憶數位影音光碟（DVD_R〇 2使用的有機染料 與其他記錄媒體相較具有較大的n，成本有效，且 目前業界以投入很多心力於可谷里。基於此理由， 上 ^ - — 、亲數位影音光碟（DVD-R) 如上所述，目前許多光學姐 “刪咖二------最重要議題是增加儲 1246683
案號92〗2Mm 五、發明說明（3) 存容量。在此考量下，P隹 量。光碟的儲存容= 家儲存容 (tiny pits)的數量，以及用以；'、士、叱义面上锨訊坑 ^ 了光Hi-2 (difii*aetiQn)的緣故，儘管使 ,:r+f有一定寬度的光束型態。此光束尺寸i: 『繞射極限』。如卜％、+、 ., 个、〗％為 • 斤坻，一般光碟具有的讀取解析極限
叮以下式表不· λ/他，其中λ為光源的波長 Z 鏡的數值孔徑。然❿，目前仍存在雷射技術盈法提上為： 此外：當物鏡的數值孔徑增加時，光學讀取；間 的距離（工作距離）將明顯地縮短 钱 可能會與光碟相撞 項取頭 使得資料遺失。 ^致光碟表面W，進而 為了克服讀取解析極限的問題，具有 super-隱）的光碟片已被提出。在具有 ^j (super-RENS)的光碟片中，主要伤佶"y从琢、、口稱 ㈣置M銀的氧化物所製成 的遮罩層。第1圖繪示具有為銀氧化物遮罩層之 在幻圖中的光碟片結構中，銀氧化物係分為銀粒 子/、乳，，U 5己錄貧料。另一方面，在資料讀取時，銀粒子 表面會形成離體子（plasmons)。這些離體子便誘發近場讀 取（near field reading，NFR)。因此，能夠讀取 射極限的極小標記。 以金屬氧化物製成的遮罩層，如銀氧化物可被使用於 二次寫入多次讀取^型態（W0RM type)的光記錄媒體，其銀
1246683 ---921?.fi301 Q斗年 10月（R 曰 修正 —__ 五、發明說明（4) 氧化物係分為銀粒子與氧，以記錄資料。意即，在記錄過 &中’金屬粒子會促使超解析效應產生。基於上述理由， 銀氧化物所製成的遮罩層並無法於唯讀記憶光碟（CD-ROM) 中使用，原因在於其係以訊坑的形式將資料『儲存 (store)』於基材上，而不是『記錄（recor(j)』於基材 上。 【發明内容】 本發明係提供一種具有高儲存容量的高密度可唯讀光 碟。此光碟可在不降低雷射二極體的波長或是不增加物鏡 的數值孔徑的情況下使用。 本發明的目的就是在提供一種高密度可唯讀光碟，包 括：一具有訊坑之基材；以及一層或多層具有超解析近場 結構之遮罩層，此遮罩層係以介電材料與金屬粒子之混合 物所製成。 本發明中，介電材料例如為括金屬氧化物（metal oxide)、金屬氮化物（metal nitride)、金屬硫化物 (metal sulfide)、金屬氣化物（metal fluoride)以及該 等材料之混合物。在本發明之較佳實施例中，介電材料例 如為ZnS-Si02 。 本發明中’金屬粒子例如為金、鉑、铑、鈀以及該等 材料的混合物。在本發明較佳實施例中，金屬粒子例如為 鉑粒子。 本發明之高密度可唯讀光碟更包括一個或多數個反射 層0 1246683 ____案號 92126301 _斗年 ϋ,β 日____ 五、發明說明（5) 置於遮罩層之上表面以及下表面上。 為讓本發明之上述和其他目的、特徵和優點能更明顯 易懂，下文特舉一較佳實施例，並配合所附圖式，作詳細 說明如下。 【實施方式】 以下，本發明將搭配圖示進行詳細之說明。
第2圖繪示為依照本發明一較佳實施例光碟之结構示 意圖。第2圖中的光碟包括一具有訊坑17的透明基材丨〇， 以及一形成於基材1 0上之遮罩層1 1。對於記錄雷射的波長 而言’基材1 0是十分透光的。基材1 0係藉由傳統基材製造 方法所形成，例如係使用具有良好耐撞性、对熱性與信賴 性之材料以射出成型的方式製造。基材1 〇的材質例如包括 聚碳酸酯（ρ ο 1 y c a r b ο n a t e)、 聚甲斟丙烯酸甲酯 (polymethylmethacrylate)、環氧樹脂（ep0Xy)、聚酯 (polyester)，以及非晶聚烯烴樹脂（amorphous polyolefin) 〇
本發明的遮罩層11係將微細的金屬粒子1 6分散於介電 材料中’而不是使用傳統的銀氧化物（s i 1 v e r ο X i d e )。微 細金屬粒子的尺寸係小於雷射光束。遮罩層係用以作為因 自我聚焦效應（self_focusing effect)所產生之近場光線 的孔徑（aper t ur e )。因此，尺寸小於1 〇 〇 nm的細微標記可 利用波長6 8 0 n m的雷射讀取。根據本發明，由於細微的金 屬粒子係用以作為表面離體子（plasmon)的來源，因此其 適用可唯讀光碟。 遮罩層11中所使用的介電材料例如為金屬氧化物、金
第10頁 Ϊ246683 五、發明說明（6) 人ί化物金屬硫化物、金屬氟化物，或是這些材料的潞 5 。舉例而言，本發明可使ffiSi〇2、Ai2〇3、si3N4
S w T ……i 、AI 2 0 3、Si3N4、 星思？或是MgF2等。在本發明較佳實施例中，分散於遮 :11中的金屬粒子例如係由金、鉑、铑以及鈀等貴金 在此If况下，由於介電材料與金屬粒子之間並不會康 並不傾向使用銀粒子（silver particles 目互間的化學反應，故可以維持細微金屬顆粒原有的形 原 3大。然而 "一一 於，銀粒子會於介電材料中的硫反應，因此 遮 單層11的特性惡化。 機Γ 士遮罩層11例如係、以賤鍍製程進行沈積而形成。 二土，中所使用的把材例如為介電材料與微細金屬粒子 微Γί:。因此’可藉由賤鍍製程將尺寸小於雷射光束之 、、、田金屬粒子分散於介電材料中。 =切示於第2圖中，本發明之光碟例如更包括一 :或夕層反射層。t資料在記錄或讀取時 就這一點而言，本發明較=用 ;有傳導特性以及馬反射性之金屬作為反射層之材 、。反射層例如係由Au、A1、Cu、Cr、Ag、Ti、pd、Ni、
Zn、Mg，及其合金所組成之族群中的—種 射層形成的厚度約為5〇111„至15〇11111之 成 為真空沈積(一deposition)、』子如 積，以及濺鍵等。本發明較佳實施例中，e 沈 如係限制在60nm至120nm之間，以確伴足、曰、厚度例 信賴性。— 峄保足夠的反射性以及 光碟例如更包括此介電層例如係
I麵 1246683
配置於遮罩層與基材之間、遮罩層與反射層之間，戋是遮 罩層的上表面與下表面上。配置於遮罩層與基材之間=介 電層係用以避免基材受熱損壞。另一方面，配置於遮罩層 與反射層之間的介電層係用以作為一擴散阻障層 曰 (diffusion prevent ion layer)。 本發明的光碟例如更包括一保護層。此保護層係用以 保S蔓其他膜層’且特別是保護反射層。保護層例如係利用 方疋轉塗佈專傳統方式而形成。更詳細地說，將一種以'環氧 樹脂或丙燒酸脂為基礎成分之紫外線固化樹脂，即一 ϋ 現出高耐撞強度且以紫外線進行固化的透明材料塗佈於反 射層上，之後再藉由紫外線固化的方式以形成此保護層。 以下’本發明將以貫施例的方式進行更詳細之說明， 但並非用以限制本發明。 實施例1 首先，提供一厚度為0· 6mm的聚碳酸酯 (polycarbonate，PC)基材。此基材上具有訊坑且其執跡 間距與數位影音光碟（DVD)同為0 · 7 4微米。接著，分別藉 由功率為40 0W以及160W的濺鍍方式將ZnS-Si02靶材以及鉑 (P t )輕材共沈積（c 〇 - d e ρ 〇 s i t)於基材上，以形成混合薄 膜。此時’氬氣（A r g a s )係以2 0 s c c m的流量提供，沈積 時的壓力為1.5 111丁〇1^，且此薄膜中2113-3102與鉑（？1:)的 體積比為80 :20。 實施例2 首先’提供一厚度為〇. 6mm的聚碳酸酯
第12頁 1246683 __塞號 92126301 年（〇月 li?日__ 五、發明說明（8) (polycarbonate，PC)基材。此基材上具有訊坑且其軌跡 間距為0.74微米。接著，藉由濺鑛的方式沈積一 ZnS-Si02 介電層以及一 ZnS-Si02 + Pt遮罩層於基材上。之後，藉由 錢鍍的方式沈積一厚度約為丨〇 〇 ηιη之銀反射層。然後，旋 轉塗佈一保護層於反射層上，此保護層之材質係以光線固 化樹脂材料為主。接著，將此組合結構放置於真空爐中以 4 0 °C烘烤12小時，以製備成光碟。在此情況下，znS-Si 02 +pt遮罩層係分別藉由功率為4〇〇w以及丨60W的濺鍍方式將 ZnS-Si02 |&材以及鉑（pt)靶材共濺鍍（c〇 —sputtering)於 基材上’以形成厚度為5〇nm之混合薄膜。此時，氬氣（Ar Φ gas)係以20 seem的流量提供，沈積時的壓力為ι · 5 mTorr，且此薄膜中ZnS —Si〇2與鉑（pt)的體積比為8〇 : 20 〇 實施例3 —除了於遮罩層與反射層之間形成一ZnS — Si〇2層之外 本實施例中可唯讀光碟皆與實施例2的製備方式相同。 比較例1 首先 k供厚度為0.6mm的聚碳酸酯 polycarbonate ’ PC)基材。此基材上具有訊坑以及預奇 J溝執（pre-grooves)，且其執跡間距為〇.74微米。接 者’精由錢鑛的方式沈結 & r* a, « 飞尤積一銀反射層。然後，旋轉塗佈 保邊層於反射層上，卜 讀光碟。 ^例係形成一種不具有遮罩層之可
枓么+ ^ - 此保護層之材質係以光線固化樹脂 1246683 修正 ___案號 92126301 五、發明說明（9) 實驗例1 實施例1 - 3以及比較例1中，光碟的效能係以具有光束 波長為6 3 5nm且光學讀取頭之數值孔徑為0 · 6 0的評估設備 來進行評估。載波對雜訊比值（carrier to noise rat i 〇，C/N)係以6公尺/秒之線性速度以及4 // W的讀取功 率量測而得，其結果繪示於第3圖中。如第3圖所繪示，讀 取解析極限（λ / 4NA)為265nm，而數位影音光碟的最小訊 坑長度為40 0nm。在比較例1的光碟中，當訊坑長度為25〇一
2 0 0nm之間，即其長度小於讀取解析極限（ 265nm)時，不會 有載波對雜訊比值（C/N)。然而，在實施例1的光碟中，二 訊坑長度為25〇nm時，會出現約40 dB的載波對雜訊比值田 (C/N)。此實驗結果證明了本發明之光碟可產生超解析效 應（super resolution effect)。 > 由上迷月頌可知，本發明能夠提供一種具有相咨 可唯讀光碟。此光碟可在不降低雷：二 =增加物鏡之數值孔徑的情況下使用。 雖然本叙明已以較佳實施例揭露 限定本發明’任何熟習此技藝 非用 _ 和範圍内’當可作些許之更 ：：雔本發明之精 範圍當視後附之申嘖專# $ ^'飾，因此本發明之保 甲明專利乾圍所界定者為準。 1246683 案號 92126301 年月丨$曰 修正 圖式簡單說明 第1圖繪示為傳統光碟之結構示意圖； 第2圖繪示為依照本發明實施例1中光碟之結構示意 圖，以及 第3圖繪示為實施例1 - 3以及比較例1所製備出之光碟 的效能評估表。 【圖式標示說明】
10 基材 11 遮罩層 16 金屬粒子 17 訊坑 第15頁

Claims (1)

1246683 _案號92126301 卩斗年月I 8曰__ 六、申請專利範圍 1. 一種高密度可唯讀光碟，包括： 一具有訊坑之基材；以及 一層或多數層具有一超解析近場結構之遮罩層，該遮 罩層係以一介電材料與一金屬粒子之混合物所製成。 2. 如申請享利範圍第1項所述之高密度可唯讀光碟， 其中該介電材料包括金屬氧化物、金屬氮化物、金屬硫化 物、金屬氟化物以及該等材料之混合物。 3. 如申請拳利範圍第1項所述之高密度可唯讀光碟， 其中該介電材枓包括ZnS-Si02。 4. 如申請享利範圍第1項所述之高密度可唯讀光碟， 其中該金屬粒子包括金、鉑、铑、鈀，以及該等材料的混 合物。 5. 如申請奉利範圍第1項所述之高密度可唯讀光碟， 其中該金屬粒子包括麵粒子。 6. 如申請冬利範圍第1項所述之高密度可唯讀光碟， 更包括一個或多數個反射層。 7.如申請專利範圍第1項所述之高密度可唯讀光碟， 更包括多數層介電層，配置於該遮罩層之上表面以及下表 面上。
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JP2004119007A (ja) 2004-04-15
DE60300474T2 (de) 2005-09-22
CN1523594A (zh) 2004-08-25
US7348124B2 (en) 2008-03-25
US20040161575A1 (en) 2004-08-19
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CN1258180C (zh) 2006-05-31
EP1403860B1 (en) 2005-04-06

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