TWI381376B - Optical information recording media - Google Patents

Optical information recording media Download PDF

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TWI381376B
TWI381376B TW096142897A TW96142897A TWI381376B TW I381376 B TWI381376 B TW I381376B TW 096142897 A TW096142897 A TW 096142897A TW 96142897 A TW96142897 A TW 96142897A TW I381376 B TWI381376 B TW I381376B
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layer
optical information
information recording
recording medium
substrate
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TW096142897A
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TW200836187A (en
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Takeshi Otsu
Akimasa Miyata
Motomitsu Hagiwara
Isao Matsuda
Fumi Hara
Shingo Kato
Takuo Kodaira
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Taiyo Yuden Kk
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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
    • G11B7/2572—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 organic materials
    • G11B7/2575—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 organic materials resins
    • 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
    • G11B7/244—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
    • G11B7/2467—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 azo-dyes
    • 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
    • G11B7/244—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
    • G11B7/247—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 methine or polymethine dyes
    • G11B7/2472—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 methine or polymethine dyes cyanine
    • 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
    • G11B7/2531—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 glass
    • 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
    • G11B7/2532—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 metals
    • 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
    • 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]
    • 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
    • G11B7/2585—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
    • 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
    • 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)

Description

光資訊記錄媒體
本發明關於一種下一代光資訊記錄媒體，尤其係關於一種於記錄層中使用有色素之藍光光碟等下一代光資訊記錄媒體。
光碟等光資訊記錄媒體作為資訊記錄媒體正快速普及。如上所述之光資訊記錄媒體有如CD-R(Compact Disk-Recordable，可記錄之壓縮光碟)般之於厚度為1.2 mm、直徑為120 mm或80 mm之透光性樹脂基板上依序形成有記錄層、反射層之光資訊記錄媒體。近年來，要求更高之資訊記錄密度。因此，考慮縮短雷射波長且使用數值孔徑(NA：numerical aperture)較大之物鏡之方式，實現如DVD±R(Digital Versatile Disc-Recordable)一次寫入式多樣化數位光碟/Digital Versatile Disc+Recordable(可記錄式多樣化數位光碟)般之光資訊記錄媒體。上述之DVD±R具有如下構造，即，為了增大基於短波長化與高NA化之碟片之傾斜角度(仰角)之容許值，貼合2張厚度為0.6 mm之透光性樹脂基板，且於上述基板間夾持有反射層及記錄層。
然而，近年來，為了記錄高精細之影像資料，要求更高之資訊記錄密度。因此，提出了如藍光光碟(BD-R)般之具有如下構造之光資訊記錄媒體，即，於厚度為1.1 mm之樹脂基板之其中一面上形成有反射層及記錄層，於形成有上 述反射層及記錄層之面上設置有厚度為0.1 mm之透光性蓋層。
如上所述之光資訊記錄媒體如日本專利特開2003-45079號公報所示，於其中一面上形成有導溝(預刻溝溝)且厚度為1.1 mm之樹脂基板上依序形成有反射層、記錄層，且於記錄層上設置有厚度為0.1 mm之透光性樹脂製蓋層，形成與CD-R或DVD±R相等之尺寸。又，如日本專利特開2003-36562號公報所示，亦有時為了保護記錄層，於該記錄層與蓋層之間設置有由透光性無機材料構成之保護層。
[專利文獻1]日本專利特開2003-45079號公報
[專利文獻2]日本專利特開2003-36562號公報
上述專利文獻等中記載之光記錄媒體之記錄層係由包含偶氮系色素或花青系色素等色素之有機物質或Si、Cu、Sb、Te、Ge等無機物質構成，藉由用照射記錄用雷射形成凹坑而記錄資料。然而，採用相同構造之情形時，若係於記錄層中使用有有機物質之光記錄媒體，則存在抖動特性及調變度惡化之問題。有機物質之記錄層於記錄時照射雷射形成凹坑時，有發熱量增多之傾向。上述熱量不僅使記錄層變形，亦使基板或蓋層變形。然而，通常，為了確保良好之循軌，基板及蓋層使用難以熱變形之材料。因此可認為，由於熱容易累積於記錄層中，由此因上述熱而導致抖動特性惡化。又，有機物質之記錄層有光程變化減小之 傾向，因此有調變度降低之傾向。此處，為了增大光程變化，考慮加深導溝之深度。然而，於加深導溝之情形時，有記錄層之色素量增多、發熱量增多之傾向。因此可認為抖動特性更惡化。
本發明之目的在於獲得一種即使係於記錄層中使用有機物質之情形時抖動特性及調變度亦良好之光資訊記錄媒體。
本發明中，作為第一發明，提出一種光資訊記錄媒體，其包括：基板，其於中心部分具有貫通孔且於其中一面上具有螺旋狀導溝；反射層，其形成於上述基板之形成有上述導溝之面上；記錄層，其由形成於上述反射層上之包含色素之有機物質構成；以及透光性蓋層，其形成於上述記錄層上；上述光資訊記錄媒體之特徵在於，上述蓋層由硬化性樹脂形成，且與上述記錄層相對之界面區域之彈性係數於25℃時為40 MPa以下。
發明者們發現，當對光資訊記錄媒體進行記錄而形成凹坑時，藉由使蓋層之界面區域塑性變形形成使凹坑深入蓋層般之形狀，而減少向記錄層累積之熱，抖動特性良好，且光程變化增大調變度良好。根據上述第一發明，藉由蓋層之熱變形而吸收記錄時之記錄層發出之熱，於冷卻後，變形以深入至上述蓋層般之形狀保留下來，因此，減少向記錄層累積之熱，抖動特性良好，並且，光程變化增大調變度良好。
又，本發明中，作為第二發明，除上述第一發明外，提出一種光資訊記錄媒體，其特徵在於：上述蓋層由第一樹脂層以及彈性係數低於上述第一樹脂層之第二樹脂層構成，且上述界面區域由上述第二樹脂層形成。
根據上述第二發明，可於對光資訊記錄媒體進行記錄時，藉由使第二樹脂層塑性變形，而減少向記錄層累積之熱，並且利用第一樹脂層確保蓋層之耐久性。
又，本發明中，作為第三發明，除上述第一發明及上述第二發明外，提出一種光資訊記錄媒體，其特徵在於：上述基板之導溝上之上述界面區域之厚度為19~30 μm。
根據上述第三發明，可確保能減少向記錄層累積之熱且使抖動特性良好之變形量。
此外，本發明之光資訊記錄媒體中，為了保護記錄層，亦可於該記錄層與蓋層之間設置有由透光性無機材料構成之保護層。因此，本發明中，作為第四發明，除上述第一發明及上述第二發明外，提出一種光資訊記錄媒體，其特徵在於：於上述記錄層與上述蓋層之間設置有保護層，且該保護層之壓入塑性．彈性為40%以下。
於記錄層與蓋層之間存在保護層之情形時，為了獲得本發明之效果，保護層亦必須跟隨於蓋層之變形而變形。根據上述第四發明，保護層之塑性變形之傾向強於彈性變形之傾向，因此保護層易於跟隨於蓋層之變形而變形。因此，可將C/N(Carrier to Noise ratio，載波雜訊比)之變化率(△C/N)抑制於1 dB以下，從而可減小對抖動特性之影 響。
根據本發明，於記錄層中使用有包含色素之有機物質之光資訊記錄媒，可獲得良好之抖動特性及調變度。
以下根據圖1~圖2，說明本發明之光資訊記錄媒體之第一實施形態。圖1所示之光資訊記錄媒體1具有：圓板狀基板2，其於中心部分具有貫通孔(未圖示)且於其中一面上具有形成為螺旋狀之導溝3；反射層4，其形成於上述基板2之形成有上述導溝3之面上；記錄層5，其形成於上述反射層4上且由包含色素之有機物質構成；以及透光性蓋層6，其設置於上述記錄層上。
基板2係厚度t為1.1 mm且直徑為120 mm之樹脂製基板。上述基板2可任意選擇使用先前之光資訊記錄媒體中用作基板材料之各種材料。具體而言，可列舉：聚碳酸酯；聚甲基丙烯酸甲酯等丙烯酸樹脂；聚氯乙烯、氯乙烯共聚物等氯乙烯系樹脂；環氧樹脂；非晶聚烯烴；聚酯樹脂；鋁等金屬；玻璃等；且可根據需要併用上述各材料。於上述材料中，自成型性、耐濕性、尺寸穩定性及低價等方面而言，較好的是熱可塑性樹脂，尤其好的是聚碳酸酯。如此般之基板2藉由射出成形而形成。此時，於模具內設置有壓模，藉由該壓模而於基板2上形成螺旋狀導溝3。上述導溝3以0.35 μm或0.32 μm之間距自內周側向外周側形成為梯形螺旋溝3，且凹坑形成於上述導溝3內。
反射層4，於形成有上述螺旋溝3之區域之整個表面上由Ag合金或Al合金等反射率高之金屬薄膜形成，且用濺鍍法等形成。記錄層5係用旋塗法，將包含色素之有機物質例如於TFP(tetrafluoropropanol，四氟丙醇)溶液中溶解有偶氮系色素或花青系色素等色素之有機物質塗佈於形成有上述反射層之整個表面上而形成。
蓋層6由透光性樹脂形成，且用旋塗法等將可藉由紫外線或射線而硬化之硬化性樹脂之厚度形成為0.1 mm。上述蓋層6之透光率，於硬化後之厚度為0.1 mm、且以波長為405 nm之光用分光光度計進行測定時為70%以上，較好的是80%以上。上述蓋層6由硬化後於25℃時之彈性係數為40 MPa以下之硬化性樹脂形成。此處，25℃時之彈性係數係藉由奈米壓痕技術(神戶製鋼技法/Vol.52 NO.2(Sep.2002)P74~P77)而測定。此外，由彈性係數為40 MPa以下之硬化性樹脂形成之蓋層6較柔軟，容易損傷，因此亦可於光入射側之表面上設置有由丙烯酸系樹脂等構成之硬塗層(未圖示)。又，對於彈性係數之下限未特別限定，但為了防止因施加局部壓力而導致蓋層6變形，較好的是10 MPa以上。
此處，根據圖2說明本發明之光資訊記錄媒體之第一實施形態之作用。將記錄用雷射(未圖示)照射至光資訊記錄媒體1時，導溝3內之記錄層5之色素分解，形成凹坑7。此時，於記錄層5中產生熱，使基板2及蓋層6產生熱變形。為了確保良好之循軌，用難以產生熱變形之材質構成基板 2。因此，彈性係數低之蓋層6之熱變形增大。由此，凹坑7形成為深入至蓋層6中之形狀。
因蓋層6之彈性係數較低，由此深入至蓋層6中之形狀之凹坑7於冷卻後仍維持著深入至蓋層6中之形狀。如此，藉由使蓋層6易於產生熱變形，而減少向記錄層5累積之熱，且抖動特性良好。又，藉由使凹坑7形成為深入至蓋層6中之形狀，光程變化增大，並且折射率接近於1之空間增加，因此，提高表觀上之折射率變化，獲得良好之調變度。
此外，無須使蓋層6整體之彈性係數為40 MPa以下，僅使與記錄層相對之界面區域之彈性係數為40 MPa以下即可。此處，與記錄層5相對之界面側之區域係例如距記錄層5與蓋層6之界面有19~30 μm厚度的部分。然而，凹坑7形成於導溝3內，因此存在上述導溝3之部分之厚度成為問題。因此，此時，界面側之區域之厚度為導溝3上之界面側之區域之厚度。
其次，根據圖3~圖4說明本發明之光資訊記錄媒體之第二實施形態。圖3所示之光資訊記錄媒體11與第一實施形態之光資訊記錄媒體1不同之處在於，蓋層16為彈性係數較高之第一樹脂層16a及彈性係數較低之第二樹脂層16b之雙層構造，第二樹脂層16b形成與記錄層15相對之界面區域。
如上所述之蓋層16以如下方式形成。於基板12之形成有導溝13之面上，依序形成反射層14及記錄層15後，於該記 錄層15上藉由旋塗而塗佈作為第二樹脂層16b之硬化性樹脂。使第二樹脂層16b硬化後，用旋塗塗佈作為第一樹脂層16a之硬化性樹脂，其後使此第一樹脂層16a硬化。如此，貼合第一樹脂層16a及第二樹脂層16b形成厚度為0.1 mm之蓋層16。
上述第二樹脂層16b形成與記錄層15相對之界面側之區域，因此，對於其厚度而言，較好的是於導溝13上之厚度t為19~30 μm。若處於上述厚度範圍內，則可確保能夠獲得良好之抖動特性及良好之調變度的變形量。
此處，根據圖4說明本發明之光資訊記錄媒體之第二實施形態之作用。將記錄用雷射(未圖示)照射至光資訊記錄媒體11時，導溝13內之記錄層15之色素分解，形成凹坑17。此時，於記錄層15中產生熱，第二樹脂層16b產生熱變形。由此，凹坑17形成為深入至蓋層16中之形狀。
深入至第二樹脂層16b中之形狀之凹坑17，因第二樹脂層16b之彈性係數於25℃時為較低之40 MPa以下，由此於冷卻後仍維持著深入至第二樹脂層16b中之形狀。由此，可減少向記錄層15中累積之熱，抖動特性良好。又，藉由使凹坑17形成為深入至第二樹脂層16b中之形狀，光程變化增大，並且折射率接近於1之空間增多，因此，提高表觀上之折射率變化，獲得良好之調變度。
其次，根據圖5~圖7說明本發明之光資訊記錄媒體之第三實施形態。圖5所示之光資訊記錄媒體21與第一實施形態之光資訊記錄媒體1之不同之處在於，於記錄層25與蓋 層26之間設置有由透光性無機物質所形成之保護層28。
上述保護層28用以防止如下混和現象，即，於蓋層26成膜時，記錄層25中所包含之色素向蓋層26擴散，或用於形成蓋層26之硬化性樹脂之溶劑等向記錄層25浸透等。構成上述保護層28之材料可列舉：氧化矽尤其二氧化矽、氧化鋅、氧化鈰、氧化釔等氧化物；硫化鋅、硫化釔等硫化物；氮化矽等氮化物；碳化矽；氧化物與硫之混合物；以及下述合金等。利用濺鍍法等方法形成上述保護層28。
具有如上所述之構造之光資訊記錄媒體21中，必須使蓋層26變形，並且使保護層28變形。為了使保護層28跟隨於蓋層26之變形，將保護層28之壓入塑性．彈性設為40%以下即可，由此，可將C/N之變化率△C/N抑制於1 db以下，可減小對抖動特性之影響。此處，壓入塑性．彈性定義為壓入塑性．彈性[%]=(彈性塑性變形功)×100/(彈性塑性變形功+塑性變形功)。
此處，根據圖6所示之圖表，詳細說明壓入塑性．彈性之定義。奈米壓痕技術中，對樣品施加測試荷重後，一面描畫負荷曲線a一面到達位移e，從而到達位移e與測試荷重之交點c。其次，去除測試荷重時，一面描畫卸載曲線b一面到達位移d。此時，將負荷曲線a、卸載曲線b以及位移軸所包圍之區域A之面積設為塑性變形功[N．m]，將卸載曲線b、位移軸以及連接點c與點e之垂線所包圍之區域B之面積設為彈性塑性變形功[N．m]。根據上述算式，當壓入塑 性．彈性縮小時，點d靠近點e，區域B之面積減小，其結果為，塑性變形之傾向強於彈性變形之傾向。
此處，根據圖7說明本發明之光資訊記錄媒體之第三實施形態之作用。將記錄用雷射(未圖示)照射至光資訊記錄媒體21時，導溝23內之記錄層25之色素分解，形成凹坑27。此時，產生熱，第二樹脂層16b以及保護層28產生熱變形。由此，凹坑27形成為深入至蓋層26中之形狀。
深入至蓋層26中之形狀之凹坑27，因蓋層26之彈性係數於25℃時為較低之40 MPa以下，由此於冷卻後亦可維持著深入至蓋層26中之形狀。又，保護層28之壓入塑性．彈性為40%以下，塑性變形之傾向較強，因此，保護層28跟隨於蓋層26之變形而變形。如此，藉由使蓋層6易於產生熱變形，而減少向記錄層5累積之熱，抖動特性良好。進而，使保護層28易於跟隨於蓋層26之變形而變形，藉此可將△C/N抑制於1 db以下，可減小對抖動特性之影響。又，藉由使凹坑27形成為深入至蓋層26中之形狀，而使光程變化增大，並且折射率接近於1之空間增多，因此，提高表觀上之折射率變化，可獲得良好之調變度。
此外，本實施形態中，列舉了蓋層26由一層樹脂層形成之示例，但即使由如第二實施形態般之雙層樹脂層形成上述蓋層26亦可獲得相同之效果。又，對於壓入塑性．彈性之下限未特別限定，但為了防止因施加局部壓力而導致保護層28變形，較好的是10%以上。
此處，根據以下實施例說明本發明之光資訊記錄媒體之 效果。
(實施例1)
用射出成形，製作於中心部分具有貫通孔、且具有軌距為0.32 μm之導溝、外徑120 mm、厚度1.1 mm之圓板狀聚碳酸酯製基板。將Ag合金濺鍍至上述基板之形成有導溝之面上而形成100 nm厚度之反射層。其後，利用旋塗法塗佈於TFP溶劑中溶解有圖8所示之偶氮系色素之色素溶液，以80℃乾燥30分鐘形成記錄層。準備好所測試之樣品數之記錄層。
其次，利用旋塗法，將硬化後於25℃時之彈性係數不同之UV(ultraviolet，紫外線)硬化性樹脂塗佈於各已準備好之樣品上，其後，進行硬化並形成厚度為25 μm之第二樹脂層。其次，利用旋塗法，將硬化後於25℃時之彈性係數為1700 MPa之UV硬化性樹脂塗佈於各樣品上，其後，進行硬化並形成第一樹脂層，貼合上述之第一樹脂層與第二樹脂層，形成0.1 mm厚度之蓋層。
使用市場銷售之記錄再生裝置(例如Pulstec工業(股份)製ODU-1000)，以波長405 nm、數值孔徑(NA)0.85、線速4.92 m/s，評估以如此方式獲得之樣品之光資訊記錄媒體的記錄/再生特性，且求出此光資訊記錄媒體之記錄時抖動特性及調變度。其後，自基板上剝離蓋層，洗掉色素，利用奈米壓痕技術，以0.1 mN之測試荷重，求出第二樹脂層之彈性係數。將記錄時抖動特性為8.0%以下、調變度為45%以上之光資訊記錄媒體設定為合格品。表1及圖9表示 其結果。
根據以上結果，若彈性係數為40 MPa以下，則記錄時抖動特性為8.0%以下，調變度為45%以上，可獲得良好之結果。
(實施例2)
用射出成形，製作於中心部分具有貫通孔且具有軌距為0.32 μm之導溝、外徑120 mm、厚度1.1 mm之圓板狀聚碳酸酯製基板。將Ag合金濺鍍至上述基板之形成有導溝之面上，形成100 nm厚度之反射層。其後，利用旋塗法，塗佈於TFP溶劑中溶解有圖8所示之偶氮系色素之色素溶液，以80℃下乾燥30分鐘，形成記錄層。準備好所測試之樣品數之記錄層。
其次，利用濺鍍法，將壓入塑性．彈性值不同之透光性保護層材料塗佈於各樣品上，形成厚度0.5 μm之保護層。其次，利用旋塗法，將硬化後於25℃時之彈性係數為35 MPa之UV硬化性樹脂塗佈於各已準備好之樣品上，其後，進行硬化，形成厚度25 μm之第二樹脂層。其次，利用旋塗法，將硬化後於25℃時之彈性係數為1700 MPa之UV硬化性樹脂塗佈於各樣品上，其後，進行硬化，形成第一樹脂層，貼合上述之第一樹脂層與第二樹脂層，形成0.1 mm 厚度之蓋層。
使用市場銷售之記錄再生裝置(例如pulstec工業(股份)製ODU-1000)，以線速度4.92 m/s、再生功率0.35 mW、記錄功率5.5 mW、記錄時再生功率(偏壓功率)1.2 mW，對以如此方式獲得之樣品之光資訊記錄媒體進行6T連續記錄(1T長度=0.08 μm)，且利用頻譜分析儀，測量記錄後不久之C/N。繼而，使再生功率增加至0.55 mW，對相同軌道進行1分鐘之再生，1分鐘後，使再生功率恢復至0.35 mW，再次利用頻譜分析儀測量C/N。根據初始C/N與利用0.55 mW之功率再生1分間後之C/N之差，求出△C/N。
對於測定了△C/N之各樣品，自基板上剝離蓋層，洗掉色素，取下保護層，利用奈米壓痕技術，以0.1 mN之測試荷重，求出彈性塑性變形功及塑性變形功，計算出壓入塑性彈性。表2表示其結果。
根據以上結果，若壓入塑性．彈性為40%以下，則△C/N為1 db以下，可獲得不會對抖動特性造成影響之保護層。
1、11、21‧‧‧光資訊記錄媒體
2、12、22‧‧‧基板
3、13、23‧‧‧導溝
4、14、24‧‧‧反射層
5、15、25‧‧‧記錄層
6、16、26‧‧‧蓋層
7、17、27‧‧‧凹坑
16a‧‧‧第一樹脂層
16b‧‧‧第二樹脂層
28‧‧‧保護層
圖1係將本發明之光資訊記錄媒體之第一實施形態之剖面加以放大併用模式方式表示之圖。
圖2係將本發明之光資訊記錄媒體之第一實施形態之記錄後之剖面加以放大並以模式方式表示之圖。
圖3係將本發明之光資訊記錄媒體之第二實施形態之剖面加以放大併用模式方式表示之圖。
圖4係將本發明之光資訊記錄媒體之第二實施形態之記錄後之剖面加以放大併用模式方式表示之圖。
圖5係將本發明之光資訊記錄媒體之第三實施形態之剖面加以放大併用模式方式表示之圖。
圖6係表示奈米壓痕技術中之負荷曲線與卸載曲線之圖表。
圖7係將本發明之光資訊記錄媒體之第三實施形態之記錄後之剖面加以放大併用模式方式表示之圖。
圖8係表示用於記錄層之色素之一例之化學式，式中，A及A'表示包含1個或複數個選自氮原子、氧原子、硫原子、硒原子以及碲原子中之雜原子之彼此相同或不同之雜環；R21至R24分別獨立地表示氫原子或取代基；Y21、Y22表示選自週期表中之第16族元素之彼此相同或不同之雜原子。
圖9係表示蓋層之彈性係數與抖動特性之關係之圖表。
1‧‧‧光資訊記錄媒體
2‧‧‧基板
3‧‧‧導溝
4‧‧‧反射層
5‧‧‧記錄層
6‧‧‧蓋層
7‧‧‧凹坑

Claims (4)

  1. 一種光資訊記錄媒體，其包括：基板，其於中心部分具有貫通孔且於一面具有螺旋狀導溝；反射層，其形成於上述基板之形成有上述導溝之面上；記錄層，其形成於上述反射層上而由包含色素之有機物質構成；及透光性蓋層，其形成於上述記錄層上；其特徵在於：上述蓋層由硬化性樹脂形成，且與上述記錄層相對之界面區域之彈性係數於25℃時為40 MPa以下。
  2. 如請求項1之光資訊記錄媒體，其中上述蓋層由第一樹脂層及彈性係數低於上述第一樹脂層之第二樹脂層構成，上述界面區域由上述第二樹脂層形成。
  3. 如請求項1或2之光資訊記錄媒體，其中上述基板之導溝上之上述界面區域的厚度為19~30 μm。
  4. 如請求項1或2之光資訊記錄媒體，其中於上述記錄層與上述蓋層之間設置有保護層，且該保護層之壓入塑性．彈性為40%以下。
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