TWI259459B - Optical disk using groove recording system - Google Patents

Optical disk using groove recording system Download PDF

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Publication number
TWI259459B
TWI259459B TW091136382A TW91136382A TWI259459B TW I259459 B TWI259459 B TW I259459B TW 091136382 A TW091136382 A TW 091136382A TW 91136382 A TW91136382 A TW 91136382A TW I259459 B TWI259459 B TW I259459B
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Taiwan
Prior art keywords
layer
disc
groove
cover layer
optical disk
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TW091136382A
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English (en)
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TW200302467A (en
Inventor
Takanobu Higuchi
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Pioneer Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • 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
    • G11B7/24056—Light transmission layers lying on the light entrance side and being thinner than the substrate, e.g. specially adapted for Blu-ray® discs
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    • 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
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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
    • G11B7/253—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]
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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
    • G11B7/241—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
    • G11B7/254—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 protective topcoat layers
    • G11B7/2542—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 protective topcoat layers consisting essentially of organic resins
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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
    • G11B2007/25708—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
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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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    • G11B7/257—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)
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    • 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
    • G11B2007/25713—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
    • 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
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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
    • G11B7/242—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
    • G11B7/244—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 organic materials only
    • G11B7/246—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 organic materials only containing dyes
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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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    • G11B7/253—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
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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
    • G11B7/2585—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
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/21—Circular sheet or circular blank

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  • Optical Record Carriers And Manufacture Thereof (AREA)

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1259459 玫、發明說明 (發明說明應敘明：發明所屬之技術領域、先前技術、内容、實施方式及圖式簡單說明） 【發明所屬之技術領域】 發明背景 1.發明相關領Μ 本發明係與單次寫入類型的光碟有關。 【先前技術】 2·相關技藝的說明 光碟係為一種資訊紀錄媒體。例如CD-R與DVD-R之最常見的單次 寫入光碟具有下述的結構。資料執側邊的一面（溝紋側邊）係提供在一藉由 旋轉塗佈作用而摻雜有機染料的透明樹脂基材上，以在該資料執上形成一 有機染料層。一由金、銀、銀合金、鋁或鋁合金所製成之金屬反射層係在 有機染料層上形成。然後，一由例如一紫外線硬化樹脂所製成的保護性塗 料（以下被稱為”覆蓋層”）係被形成在該金屬反射層。當要資料（訊息）被 "己錄在光碟上時，一雷射光束係輻射照射在基材側邊上。該雷射光束會分 解有機染料。折射率會㈣有機染料分解献變。該雷射光束也會因為熱 的產生而改變資料執及/或反射層。折射率的變化、資料執的改變和反射層 的改變之結合，會產生所紋孔以記錄訊息。 / ι年來’已峰展出次世代的可記錄光碟系統（例如被稱為"仍 核）’其係彻—紫光雷射作為光源，並藉由-具有高數值孔徑_ ==祕___訊。在麗齡攝顯）_，光碟 後盍曰子約0.1個毫米’而且雷射光束係被輻射照射在該覆蓋層之一側。 1259459 蓋層，因此該反射層、該光學性質變化材料層與保護性層係被該覆蓋層密 封在樹脂基材上，該覆蓋層係光可穿透的，其中該樹脂基材至少在光束照 射該位於該等溝紋的凹溝内之光學性質變化材料層的時候，係比該覆蓋層 還要硬。該光碟因此可以提供細微訊息記錄區，以在訊息被記錄於光碟的 溝紋中時，達成高密度記錄效果。 显式簡要說明 第1A圖概要地圖示一依照本發明的具體例的DVR-R光碟的透視 圖。 第1B圖是在第1A圖中所顯示的DVR_R光碟之在該光碟的徑向 方向上之橫截面剖視圖。 第1C圖是在第1B圖中所顯示的DVR-R光碟之有機染料層和鄰近 層次的橫截面剖視圖。 第2A圖是一光碟的橫截面剖視圖，以例示說明如果一基材（側邊）比 一覆蓋層（側邊）更軟的話，在記錄訊息時光碟中發生的改變。 第2B圖是一光碟的橫截面剖視圖，以例示說明如果一基材（側邊）比 一覆盍層（側邊）更硬的話，在記錄訊息時光碟中發生的改變。 【實施方式】 發明的詳細說明 依fc、本發明的DVR-R光碟之一具體例將參照隨附的圖式來加以描 1259459 參照第1A、1B和1C圖，依照此-具體例的光碟8(也就是，DW-R 光碟）包含有-樹脂紐Η)，㈣由—例如聚碳_旨和輯烴之高分子材 料所製造。在樹脂基材1G用於資訊記錄的表面具有數個供形成資訊軌的 溝紋12。 在本具體财，該特紋12係蛇行晃_接·記錄在光碟8上 之資料的定址訊息。也就是說，訊息係、被記錄在—形成蛇行凹執12之訊 息記錄層上。在本發明說明中，此種記錄方法被稱為，，溝紋内記錄”或” 溝紋記錄”。 如第ic圖所示，-個反射層13係被形成在基材1〇的溝紋12之 上。該反觸13是係由銘、銀或_及/或銀的合金金騎製成，因該反 射層13必須是_並且有高反射力。該覆蓋該溝紋12的反射層13係 形成一種凹凸的外形。 -有機染料鋪由旋轉塗佈_祕加在反射層13，藉此形成一有 機染料層Μ。因為在這個具體例中使用溝紋記錄作用，有機染料層14係 被形成以完全地填滿如第1C圖所顯示的溝紋12之凹溝部分。 一保濩層15係被形成在有機染料層14之上，而一覆蓋層η係被 形成在保護層15之上。保護層15是一介電薄膜保護有機的染料以隔絕 用於硬化該覆蓋層11之樹脂的紫外光線。因為該保護性層15需要是 高度透明的且應該要保護有機染料層，該保護性層15係由例如si〇x和 AlOx之金屬氧化物，或是例如SiNx和ΑιΝχ之金屬氮化物所製成。 1259459
Ha>Hb 在壓痕硬度试驗中，測試物體的表面（在深度上可以達到數十㈣ 能被忽略。因此，在這-個具體财，形成在樹脂基材1()上的反射層i3 (厚約20mn)與形成在覆蓋層u上之保護性層ls (厚約可以被 心略。因此’硬度Ha可以代表基材本身的硬度，而硬度Hb可以代表覆 盖層本身的硬度。 «將描述製造WR_R辆8㈣法。顔躲意的是，本發明 的製造方法並未偈限於下面的描述中。在下面提到的特殊材料、尺寸、比 率和數值是僅僅是用於例示說明。 溝紋（資料執）首先在藉由-電子束記錄器和一電子束光阻而形成在 一主光碟上，以製備一具溝紋的主光碟（初使光阻）。一鎳衝壓模然後以電 成形法由被主光碟產生。 該鎳衝壓模係用於以一射出成形模製的方法而以聚碳酸酯樹脂來產 生一樹脂基材10。該樹脂基材10的直徑大約是12〇_而厚度大約是 1.1_°在基材表面上的該溝紋12深8〇11111而磁執間距是32〇11111。在溝 紋12之間的間距，也就是，在溝紋12之間的突出物16的寬度是 130nm，而溝紋的壁之角度是大約90度。 一由鋁-鈦合金（Al:Ti = 99:1)所製造的反射層13,係在樹脂基材1〇 的溝紋12上形成。該反射層13係藉由濺散作用來產生，因此反射層13 具有大約20個rnn的厚度。在那之後，該反射層13係藉由旋轉塗佈作 用而將反射層13塗佈以一有機染料，因此該反射層13在溝紋内具有大 約70nm的厚度，而在溝紋12之間的突出物16上具有大約35nm的厚 1259459 x在°亥有機染料層14上’-保護性層15係藉由濺散作用以二氧化石夕 (·)屯成，因此s亥保濩性層15具有5nm的厚度。 然後，-具有大約0.095毫米的厚度的聚碳酸醋薄膜係藉著使用—紫 外線硬化黏著劑故固定在保護性層15上。 以上述方法生產的DVR_R的絲8細触筆職來進行測試。 在樹脂基材側邊的硬度是HB，而在覆蓋層側邊的硬度是2b。 以此種方法生產的DVR.R的辆8和以不同方法生產dvr_r光 碟8的記錄特性，將參照該DVR_R光碟的剖視圖（第2a和2b圖）來 描述。 當在光碟8 (8')上記錄資簡日輪，—雷射光束倾照射到光碟8 ⑻的覆蓋制邊。該騎絲通過覆蓋層u和倾性層^同時聚焦在 溝紋+，藉此在有機染料層14中產生一個光束點2〇。在光束點2〇 中之有機紐係被射光束熱分解，而該部分之有機染料的折射率會改變。 折射率的此觀化是魏顧的，且該折鱗即使在餘光束騎完成時 光束點20的溫度酬-個正常溫度之後也不會復原。藉著這種方法，訊 息係被記錄在溝紋12的凹溝内之有機染料層14中。因此記錄標記藉由 光束點20而在溝紋12内產生。 因為，有機染料的體積會膨脹該有機染料的熱分解會在光束點2〇附 近的有機染料層14中產生一個應力。因此，如果該樹脂基材側邊係比該 覆蓋層側邊更軟的話，如第2A圖所示，1假設的波浪狀虛線的扭曲變 1259459 形會因為傳導至反射層13與樹脂基材1G的應力喊生。當記錄在資料執 上的訊息被取回的時候，反射層13的扭曲會引起一個問題。 當取回在DVR-R的光碟8,上記錄的訊息的時候，會利用來自反射 層13的雷射光束之反射。因此，如果反射層13具有一扭曲，一大量的 失真現象會包含在该取回的訊息(或是回放訊號）中。特別是，因為dvr_r 光碟8’具有較DVD-R光碟和CD_R光碟來得小的記錄標記和一較狹窄 的磁執間距以記錄更多的訊息（以增加記錄密度或容量），該反射層的扭曲 會對訊號的取回有不利的影響，且會引起串音現象。串音現象是在相鄰的 訊息貨料執之間的干擾。 與DVR-R光碟8’不同的，本發明的具體例之DVR_R光碟8 (第 2B圖）具有樹月旨基材彻!邊總是比覆蓋層側it更硬的結構，或是在雷射光束 照射下有機轉層Μ的折射率變化時，該樹絲材側邊會變得比覆蓋層 側邊更硬的結構。因此，如第2Β圖所示，由於在光束點2〇中與附近的 有機染料層14朝向該覆蓋層邊延伸的體積膨脹，會導致以波浪狀虛線所 標示的扭曲現象。該賴性層15和覆蓋層11會變形，但是樹脂基材側 邊不^憂幵y。因為避免了在該基材側邊的變形，反射層的變形就會被 避免。如上所述，反射層13的變形會大幅減少取回的該記錄訊息。因為 反射層13不變形，所以也可以避免串音現象。 如果有機染料層14、覆覆蓋層11和保護層15的材料係被適當地 、疋的居，將有機染料層14與該覆蓋層側邊（覆蓋層和保護層的組合）之 1的折射率差異設定成非常小（例如大約〇.丨到1〇)是可能的。如果該折 12 1259459 射率的差異係被做的小的話’即使應力如第2B _示的在覆蓋層側邊上 造成變形’在保護層15和覆蓋層11之_介面之反射就可以被忽略。 因為保護性層15和覆蓋層11是透明的，即使在保護性層15和覆蓋層 Π中存在有變形現象，該取回的訊息之性質頁會受到不利的影響。 在用於訊息記錄的雷射光束照射所造成之有機染料的熱產生，可能會 影響附近的訊息記錄資料軌這項事實’也必需要加以考慮。這是交又寫入 (crosswrite)的現象。然而’因為在這一個具體例中使用溝紋記錄方法記 錄訊息的有機染料層係被具有高熱傳導率的該金屬反射層13所包圍，如 第2B圖所示。因此，在雷射光束照射下有機染料層μ中所產生的熱， 立刻被金屬的反射層13吸收。因此，該產生的熱不會干擾鄰近的訊息記 錄資料執。 【圖式簡單說明】 第1Α圖概要地圖示一依照本發明的具體例的DVR_R光碟的透視 圖。 第1B圖是在第1A圖中所顯示的DVR_R光碟之在該光碟的徑向 方向上之橫截面剖視圖。 第1C圖是在第1B圖中所顯示的DVR-R光碟之有機染料層和鄰近 層次的橫戴面剖視圖。 第2A圖是一光碟的橫截面剖視圖，以例示說明如果一基材（側邊）比 一覆蓋層（側邊）更軟的話，在記錄訊息時光碟中發生的改變。 圖是一光碟的撗載面剖視圖，以例示說明如果一基材（側邊）比一覆 13 1259459 蓋層（側邊）更硬的話，在記錄訊息時光碟中發生的改變 14有機染料層 15保護層 16突出物 20光束點 【元件標號對照表】 8, 8’光碟 10樹脂基材 11覆蓋層 12溝紋。 13反射層

Claims (1)

1259459 申請專利範圍 第91136382號專利申請案申請專利範圍修正本 巧⑹川 1· 一種用於記錄訊息的光碟，其包含： 一樹脂基材，其在該樹脂基材之一表面上具有溝紋； -反射層，其係形成在溝紋之上，因此該在樹脂基材上之反射層係 與溝紋的形狀一致的； -光學性貝Μ化材料層，其麵成在反射層上，因此該光學性質變 化材料層會填入個別的溝紋所界定的凹溝並延伸至溝紋之間的突出部分 之上，该光學性質變化材料層會在光束的照射之下改變光學特性； 保層’其係軸在光學性質變化材料層之上，該保護性層係 光可穿透的；以及 -覆盍層，其係形成麵護性層上，因此該反射層、該光學性質變 /才料層性層’係被該覆蓋層密封在樹脂基材上，該覆蓋層係光 可牙透的’其中该樹脂基材至少在光束照射該位於該等溝紋的凹溝内之 光學性質變化材料層的時候，係比該覆蓋層還要硬，其中在光束照射在 後孤層側政上的時候，該訊息係被記錄於溝紋的凹溝内之該光學性質變 化材料層中。 如申ϋ月專利乾圍第1項的光碟，其中該光學性質變化材料層係由一種有 機木料材料製成，該有機染料材料在光束於上面照射的時候折射率會改 變。 3.如申請專利範圍第] u $ j項的光碟，其中該光碟是一 DVR-R光碟。 15 1259459 4. 如申請專利範圍第1項的光碟，其中該基材厚約1.1毫米而該覆蓋層 厚約0.1毫米。 5. 如申請專利範圍第2項的光碟，其中該基材的硬度在該光學性質變化材 料層的折射率改變之後，係大於覆蓋層的硬度。
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