CN101308680A - 光信息记录媒体 - Google Patents

光信息记录媒体 Download PDF

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CN101308680A
CN101308680A CNA2008100904477A CN200810090447A CN101308680A CN 101308680 A CN101308680 A CN 101308680A CN A2008100904477 A CNA2008100904477 A CN A2008100904477A CN 200810090447 A CN200810090447 A CN 200810090447A CN 101308680 A CN101308680 A CN 101308680A
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information recording
recording layer
overlayer
optical information
recording media
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原风美
大津毅
佐藤昌司
加藤真悟
松田勋
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Taiyo Yuden Co Ltd
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/257Record 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
    • G11B7/2572Record 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
    • G11B7/2575Record 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242Record 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
    • G11B7/244Record 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
    • G11B7/246Record 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
    • G11B7/2467Record 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242Record 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
    • G11B7/244Record 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
    • G11B7/246Record 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
    • G11B7/247Record 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
    • G11B7/2472Record 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/253Record 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
    • G11B7/2531Record 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
    • GPHYSICS
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    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/253Record 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
    • G11B7/2532Record 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/253Record 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
    • G11B7/2533Record 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/253Record 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
    • G11B7/2533Record 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
    • G11B7/2534Record 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]
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/258Record 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
    • G11B7/2585Record 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record 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
    • G11B7/258Record 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
    • G11B7/259Record 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

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Abstract

本发明的目的在于获得一种在记录层中使用有机物质的情况下也具有良好的调制度的光信息记录媒体。本发明的光信息记录媒体1包括:基板2,其中心部分具有贯通孔,且在作为光入射侧的其中一个面侧具有引导槽3;反射层4,其形成在所述基板2的形成有所述引导槽3的面上;记录层5,其形成在所述反射层4上,且由含有色素的有机物质而构成;以及设置在所述记录层5上的透光性覆盖层6,所述光信息记录媒体1的特征在于,所述覆盖层6是由硬化树脂而形成,在25℃时,与所述记录层5相对的一侧的弹性模量在34~96MPa的范围内。

Description

光信息记录媒体
技术领域
本发明涉及一种光信息记录媒体,尤其是涉及记录层中使用了色素的蓝光光盘(BD-R,Blu-ray Disc-Recordable)等具有更高记录密度的光信息记录媒体。
背景技术
作为信息记录媒体,光盘等光信息记录媒体正在逐渐普及。对于所述光信息记录媒体,具有像可记录型CD(Compact disk,光盘)(CD-R)等那样的在厚度1.2mm、直径120mm或者80mm的透光性树脂基板上依次形成反射层、记录层而形成的光信息记录媒体。近年来,信息记录媒体要求具有更高的信息记录密度。因此,考虑的方式是使用激光波长短且数值孔径(NA:numerical aperture)大的物镜,来实现像可记录型DVD(digital versatile disc,数字通用光盘)(DVD±R)等之类的光信息记录媒体。由于利用短波长化及高NA化来增大光盘的倾斜角度(tilt)的容许值,因此所述DVD±R具有的构造为,将厚度0.6mm的两片透光性树脂基板黏合,并在这两片基板之间夹入反射层及记录层。
然而,近年来为了记录高精度的影像数据,要求更高的信息记录密度。因此,提出一种像可记录型蓝光光盘(BD-R)之类的光信息记录媒体,此光信息记录媒体的构造为,在厚度1.1mm的树脂基板的光入射面侧形成反射层及记录层,并在形成了所述反射层和记录层的面上,设置厚度为0.1mm的透光性覆盖层。
如日本专利特开2003-45079号公报所示,所述光信息记录媒体是在厚度为1.1mm且其中一个面上形成有引导槽(Pregroove,预刻槽)的树脂基板上,依次形成反射层、记录层,并在所述记录层上设置厚度0.1mm的透光性树脂制的覆盖层,从而形成和CD-R(Compact Disk-Recordable,可记录型光盘)及DVD±R相同的直径及厚度。另外,如日本专利特开2003-36562号公报所示,有时为了保护记录层,也会在所述记录层和覆盖层之间设置由透光性无机材料所构成的保护层。这样的光记录媒体的记录层是由含有偶氮系色素及花青系色素等色素的有机物质、以及Si、Cu、Sb、Te、Ge等无机物质而构成,通过记录用的激光照射来形成凹坑,从而记录数据。
【专利文献1】日本专利特开2003-45079号公报
【专利文献2】日本专利特开2003-36562号公报
发明内容
[发明所欲解决的问题]
然而,对于BD-R,存在以下问题:和记录层中使用了无机物质的BD-R相比,记录层中使用了有机物质的BD-R的调制度较低。和无机物质的记录层等相比,有机物质的记录层的光路长度变化具有变小的倾向,因此调制度变低。这里,为了增大光路长度变化,考虑加深引导槽的深度。然而,引导槽的深度加深后,会导致记录层的厚度增厚、色素量增多,从而使记录前的反射率具有变低的倾向。由此反而会导致光路长度变化变小,从而调制度会更低。
本发明的目的在于获得一种在记录层中使用有机物质的情况下也具有良好的调制度的光信息记录媒体。
[解决问题的技术手段]
本发明的第一技术方法提出一种光信息记录媒体,包括:基板,其中心部分具有贯通孔,且在其中一个面侧具有螺旋状的引导槽;反射层,其形成在所述基板的形成有所述引导槽的面上;记录层,其形成在所述反射层上,且由含有色素的有机物质而构成;以及形成在所述记录层上的透光性覆盖层,所述覆盖层是使用硬化树脂而形成,在25℃时,与所述记录层相对的一侧的弹性模量在34~96MPa的范围内。
本发明者等发现,在向光信息记录媒体上进行记录时形成凹坑,此时使与覆盖层的记录层相对的一侧发生塑性变形,从而凹坑形成陷入到覆盖层中的形状,由此使得光路长度变化增大,调制度良好。根据所述第一技术方法,记录层在记录时放热而引起覆盖层变形,冷却后,因为陷入到所述覆盖层的形状而残留有变形,因此光路长度变化增大,调制度变得良好。
而且,除了所述第一技术方法之外,本发明的第二技术方法提出一种光信息记录媒体,其中所述覆盖层是由第一树脂层以及弹性模量低于所述第一树脂层的第二树脂层而构成,与所述记录层相对的一侧是由所述第二树脂层而形成。
根据所述第二技术方法,在向光信息记录媒体上进行记录时,可一方面使第二树脂层塑性变形以确保充分的光路长度变化,一方面利用第一树脂层来确保覆盖层的耐久性。
另外,本发明的光信息记录媒体中,为了保护记录层,也可以在所述记录层和覆盖层之间设置由透光性无机材料所构成的保护层。因此,除了所述第一技术方法及所述第二技术方法以外,本发明的第三技术方法提出一种光信息记录媒体,在所述记录层与所述覆盖层之间设置着保护层,此保护层的挤压塑性、挤压弹性为40%以下。
当在记录层和覆盖层之间存在保护层的情况下,为了获得本发明的效果,保护层也必须随着覆盖层的变形而变形。根据所述第三技术方法,保护层的塑性变形的倾向会强于弹性变形的倾向,因此保护层容易随着覆盖层的变形而变形。从而可以将C/N(Carrierto Noiseratio,载波噪声比)的变化率(ΔC/N)控制在1dB以下,并且可减小对调制度的影响。
[发明的效果]
根据本发明,可以获得调制度良好的光信息记录媒体,其中的记录层使用了含有色素的有机物质。
附图说明
图1是本发明的第一实施形态中光信息记录媒体的剖面放大示意图。
图2是本发明的第一实施形态中光信息记录媒体的记录后的剖面放大示意图。
图3是本发明的第二实施形态中光信息记录媒体的剖面放大示意图。
图4是本发明的第二实施形态中光信息记录媒体的记录后的剖面放大示意图。
图5是本发明的第三实施形态中光信息记录媒体的剖面放大示意图。
图6是表示纳米压痕法中的加载曲线和卸载曲线图。
图7是本发明的第三实施形态中光信息记录媒体的记录后的剖面放大示意图。
图8是表示记录层中使用的色素之一例的化学式。
式中,环A表示与其键合着的碳原子和氮原子一起形成的杂环,环B表示可以被取代的苯环,环C表示合有与其键合着的氮原子的杂环,也可以和环B键合,X-表示可具有活性氢的基,M2+表示二价阳金属离子,并以所有阴离子作为偶氮色素分子,表示2个偶氮色素分子上键合有1个M2+分子而成的金属络和物。
[符号的说明]
1、11、21    光信息记录媒体
2、12、22    基板
3、13、23    引导槽
4、14、24    反射层
5、15、25    记录层
6、16、26    覆盖层
7、17、27    凹坑
16a          第一树脂层
16b          第二树脂层
28           保护层
具体实施方式
以下,根据图1~图2来说明本发明的光信息记录媒体的第一实施形态。图1所示的光信息记录媒体1包括:圆盘状的基板2,其中心部分具有贯通孔(未图示),且在其中一个面侧具有形成为螺旋状的引导槽3;反射层4,其形成在所述基板2的所述引导槽3上;记录层5,其形成在所述反射层4上,且由含有色素的有机物质而构成;以及设置在所述记录层上的透光性覆盖层6。
基板2是厚度t为1.1mm且直径为120mm的树脂制基板。此基板2可任意选择用作以前的光信息记录媒体的基板材料的各种材料来使用。具体而言,可举出聚碳酸酯、聚甲基丙烯酸甲酯等丙烯酸酯树脂、聚氯乙烯、氯乙烯共聚物等氯乙烯系树脂、环氧树脂、非晶聚烯烃(amorphous polyolefin)、聚酯树脂、铝等金属、以及玻璃等,也可根据需要,通过组合或混合等方法而并用所述材料。所述材料中,从成型性、耐湿性、尺寸稳定性及低价等方面而言,优选热塑性树脂,尤其优选聚碳酸酯。所述基板2可使用射出成形法而形成。此时,在模具内设置压模件(stamper),由此而在基板2上形成螺旋状的引导槽3。此引导槽3以0.35μm或0.32μm的间距而形成,并且所述凹坑形成在此引导槽3内。
反射层4是由Ag合金或Al合金等反射率高的金属薄膜而形成,并且是使用溅射等方法而形成的。记录层5是由含有色素的有机物质而形成的,例如将偶氮系色素或花青系色素等色素溶解于例如TFP(tetrafluoropropanol,四氟丙醇)溶液中,并以旋涂法来涂布所述溶液而形成。
覆盖层6是由透光性树脂而形成,并且使用旋涂法等方法而形成厚度为0.1mm的经紫外线或放射线而硬化的硬化树脂。关于所述覆盖层6的透光率,使用分光光度计,以波长为405nm的光来测量硬化后的厚度为0.1mm的所述覆盖层6,测得其透光率为70%以上,优选80%以上。所述覆盖层6是由硬化后的在25℃时的弹性模量为34~96MPa之范围内的硬化树脂而形成。此处,在25℃时的弹性模量,是使用纳米压痕法(神户制钢技术/Vol.52 NO.2(Sep.2002)P74~P77)而测得的。另外,由弹性模量为34~96MPa之范围内的硬化树脂所形成的覆盖层6比较柔软,易受损伤,因此也可以在光入射侧的表面上设置由丙烯酸系树脂等构成的硬质涂层(未图示)。
此处,根据图2来说明本发明的光信息记录媒体的第一实施形态的作用。如果对所述光信息记录媒体1照射记录用激光(未图示),则引导槽3内的记录层5的色素会分解,从而形成凹坑7。此时记录层5上产生热,导致基板2及覆盖层6产生热变形。为了确保良好的循轨(tracking)而使基板2以较难产生热变形的材料来构成。因此,就热变形而言,弹性模量低的覆盖层6,其热变形会增大。因而,凹坑7成为陷入到覆盖层6中的形状。
因为覆盖层6的弹性模量比较低,所以形成为陷入到覆盖层6中的形状的凹坑7在冷却后,仍维持着陷入到覆盖层6的形状。如上所述,使凹坑7成为陷入到覆盖层6的形状,这样,光路长度变化会变大,折射率接近1的空间会增加,从而可提高外观上的折射率变化,并可获得良好的调制度。
此处,对将弹性模量特定在34~96MPa范围内的理由加以说明。如果使覆盖层6的弹性模量较低,则容易产生热变形。而当弹性模量过低时,因记录后的经时变化而易导致自发性变形。例如因光信息记录媒体的自重而承受厚度方向的压力时,凹坑7的陷入到覆盖层6中的部分会在厚度方向上产生变形,使得光路长度变化变小。因此,即使记录时具有充分的调制度,例如具有40%以上的调制度,也会因经时变化而使调制度低于40%。所以,为了减小调制度的经时变化,弹性模量必须在34MPa以上。另一方面,如果覆盖层6的弹性模量过高,则难以产生热变形,因而无法形成记录时具有充分调制度的凹坑。因此,为了在记录时获得充分的调制度,例如为了获得40%以上的调制度,弹性模量必须在96MPa以下。
另外,整个覆盖层6的弹性模量无需均在34~96MPa的范围内,只要仅与记录层相对的一侧的弹性模量在34~96MPa的范围内即可。此处,与记录层5相对的一侧的弹性模量在34~96MPa范围内的部分,例如是指与记录层5和覆盖层6的界面相距19~30μm的部分。然而,因为凹坑7形成在引导槽3内,所以存在此引导槽3的部分的厚度会成问题。于是,此时与记录层相对的一侧的弹性模量在34~96MPa范围内的部分的厚度,成为引导槽3上的厚度。
接着,根据图3~图4来说明本发明的光信息记录媒体的第二实施形态。图3所示的光信息记录媒体11和第一实施形态的光信息记录媒体1的不同之处在于,覆盖层16是由弹性模量比较高的第一树脂层16a和弹性模量比较低的第二树脂层16b而形成的双层构造,并且第二树脂层16b形成了与记录层15相对的一侧的弹性模量在34~96MPa范围内的部分。
所述覆盖层16是以如下方式而形成的:在基板12的形成有引导槽13的面上,依次形成反射层14及记录层15,然后在所述记录层15上,以旋涂法来涂布成为第二树脂层16b的硬化树脂,当所述第二树脂层16b硬化后,以旋涂法来涂布成为第一树脂层16a的硬化树脂,然后使其硬化。这样,将第一树脂层16a和第二树脂层16b合并而形成厚度为0.1mm的覆盖层16。
因为所述第二树脂层16b形成了与记录层15相对的一侧的弹性模量在34~96MPa范围内的部分,所以此部分在引导槽13上的厚度t优选在19~30μm范围内。如果所述部分的厚度在此范围内,则可确保能够获得良好调制度的变形量。
此处,根据图4来说明本发明的光信息记录媒体的第二实施形态的作用。如果对光信息记录媒体11照射记录用激光(未图示),则引导槽13内的记录层15的色素会分解,从而形成凹坑17。此时记录层15产生热,导致第二树脂层16b产生热变形。由此,凹坑17形成为陷入到覆盖层16的形状。
因为第二树脂层16b的弹性模量比较低,在25℃时为34~96MPa的范围,所以形成为陷入到第二树脂层16b中的形状的凹坑17在冷却后,仍维持着陷入到第二树脂层16b的形状。由此,使凹坑17形成为陷入到第二树脂层16b的形状,这样,光路长度变化会变大,折射率接近1的空间会增加,从而可提高外观上的折射率变化,并可获得良好的调制度。
接着,根据图5~图7来说明本发明的光信息记录媒体的第三实施形态。图5所示的光信息记录媒体21和第一实施形态的光信息记录媒体1的不同之处在于,图5所示的光信息记录媒体21在记录层25与覆盖层26之间设置了由透光性无机物质而形成的保护层28。
此保护层28是为了防止覆盖层26成膜时记录层25中含有的色素向覆盖层26扩散、或者覆盖层26形成用的硬化树脂溶剂等向记录层25渗透等的混合现像。构成所述保护层28的材料可举出氧化硅特别是二氧化硅,以及氧化锌、氧化铈、氧化钇等氧化物;硫化锌、硫化钇等硫化物;氮化硅等氮化物;碳化硅;氧化物和硫的混合物以及下述合金等。所述保护层28是以溅射等方法而形成的。
具有所述构造的光信息记录媒体21中,必须在使覆盖层26变形的情况下,与之相应而使保护层28也变形。为了使保护层28随着覆盖层26的变形而变形,可将保护层28的挤压塑性·弹性设为40%以下,由此可以将C/N的变化率ΔC/N控制在1dB以下,从而可减小对调制度的影响。此处挤压塑性·弹性定义如下:
挤压塑性·弹性[%]=
(弹性塑性变形当量)×100/(弹性塑性变形当量+塑性变形当量)。
此处,根据图6所示的图表来详细说明挤压塑性·弹性的定义。在纳米压痕法中,对样品施加测试负载时,画出加载曲线a,并使其到达位移点e,并且到达位移点e和测试负载的交点c。接着去除测试负载,然后画出卸载曲线b,并使其到达位移d。此时,将加载曲线a与卸载曲线b以及位移轴所围成的区域A的面积设为塑性变形当量[N·m],将卸载曲线b、位移轴以及连接点c与点e的垂线所围成的区域B的面积设为弹性塑性变形当量[N·m]。根据上式,如果挤压塑性·弹性变小,则点d会靠近点e,从而区域B的面积会变小,其结果导致塑性变形的倾向强于弹性变形的倾向。
此处,根据图7来说明本发明的光信息记录媒体的第三实施形态的作用。如果对光信息记录媒体21照射记录用激光(未图示)时,则引导槽23内的记录层25的色素会分解,从而形成凹坑27。此时记录层25产生热,导致保护层28随着第二树脂层16b而产生热变形。由此,凹坑27形成为陷入到覆盖层26的形状。
因为覆盖层26的弹性模量比较低,在25℃时为34~96MPa的范围,所以形成为陷入到覆盖层26的凹坑27在冷却后,仍维持着陷入到覆盖层26的形状。而且,因为保护层28在挤压塑性·弹性为40%以下时其塑性变形的倾向较强,所以会随着覆盖层26的变形而变形。如上所述,由于覆盖层6容易产生热变形,因而凹坑27形成为陷入到覆盖层26的形状,这样,光路长度变化会变大,折射率接近1的空间会增加,从而可提高外观上的折射率变化,并可获得良好的调制度。进一步,由于保护层28容易随着覆盖层26的变形而变形,因而可以将ΔC/N控制在1dB以下,从而减小对调制度的影响。
再者,本实施形态中举出的覆盖层26是由一层树脂层而形成的示例,当所述覆盖层26像第二实施形态那样由双层树脂层而形成时,也可获得相同的效果。另外,挤压塑性·弹性的下限并没有特别的限制,但为了防止因局部施加压力而导致保护层28变形,挤压塑性·弹性的下限优选10%以上。
此处,根据以下实施例来说明本发明的光信息记录媒体的效果。
(实施例1)
使用射出成形法来制作一圆盘状的聚碳酸酯制基板,此基板的中心部分具有贯通孔,且具有循轨间距为0.32μm的引导槽,并且外径为120mm,厚度为1.1mm。在所述基板的形成有引导槽的面上溅射Ag合金,以形成厚度为100nm的反射层。此后使用旋涂法来涂布将图8所示的色素溶解于TFP溶剂中所得的色素溶液,并在80℃时干燥30分钟,形成记录层。准备用来进行测试的数量的所述基板样品。
接着,使用旋涂法,将硬化后的25℃时的弹性模量不同的UV(UltraViolet,紫外线)硬化树脂涂布到所准备的各个样品上,之后使其硬化,形成厚度为25μm的第二树脂层。其次使用旋涂法,将硬化后的25℃时的弹性模量为1700MPa的UV硬化树脂涂布到各个样品上,之后使其硬化,形成第一树脂层,并将所述第一树脂层与第二树脂层合并而形成厚度为0.1mm的覆盖层。
使用市售的记录再生装置(例如Pulstec工业株式会社制ODU-1000),在波长405nm、数值孔径(NA)0.85、线速度4.92m/s的条件下,对以所述方法而获得的光信息记录媒体的样品进行记录/再生特性的评价,求出初始调制度。然后在温度25℃、湿度30%的环境下放置一个月,再次求出调制度。接着将覆盖层从基板上剥离,冲洗掉色素,并在25℃的环境下,通过纳米压痕法在0.1mN的测试负载下,求出第二树脂层的弹性模量。调制度在40%以上时为合格。其结果示于表1中。
[表1]
 比较例1  比较例2  实施例1  实施例2  实施例3  实施例4  比较例3
  弹性率(MPa)   14   27   34   56   77   96   117
  初始调变度(%)   45   44   43   42   41   40   38
  一个月后调制度[%]   33   38   43   42   41   40   38
根据所述结果,如果弹性模量在34~96MPa范围内,则一个月后的调制度仍可维持在40%以上,从而可获得良好的结果。
(实施例2)
使用射出成形法来制作一圆盘状的聚碳酸酯制基板,此基板的中心部分具有贯通孔,且具有循轨间距为0.32μm的引导槽,并且外径为120mm,厚度为1.1mm。在所述基板的形成有引导槽的面上溅射Ag合金,以形成厚度为100nm的反射层。此后使用旋涂法来涂布将图8所示的色素溶解于TFP溶剂中所得的色素溶液,并在80℃时干燥30分钟,形成记录层。准备用来进行测试的数量的所述基板样品。
接着,将挤压塑性·弹性值不同的透光性保护层材料溅射到各个样品上,以形成厚度为0.5μm的保护层。然后,使用旋涂法,将硬化后的25℃时的弹性模量为35MPa的UV硬化树脂涂布到所准备的各个样品上,之后使其硬化,形成厚度为25μm的第二树脂层。接着使用旋涂法,将硬化后的25℃时的弹性模量为1700MPa的UV硬化树脂涂布到各个样品上,之后使其硬化,形成第一树脂层,并将所述第一树脂层与第二树脂层合并而形成厚度为0.1mm的覆盖层。
使用市售的记录再生装置(例如Pulstec工业株式会社制ODU-1000),在线速度4.92m/s、再生功率0.35mW、记录功率5.5mW、记录时再生功率(偏置功率(bias power))1.2mW的条件下,对以所述方式而获得的光信息记录媒体的样品进行6T的连续记录(1T长度=0.08μm),并使用光谱分析仪(spectral analyzer)来测量记录后的C/N。接着,使再生功率增加为0.55mW,并使同一轨道再生1分钟,1分钟后,将再生功率恢复为0.35mW,并再次使用光谱分析仪来测量C/N。根据初始C/N与在0.55mW的功率下再生1分钟后的C/N的差,而求出ΔC/N。
将覆盖层从基板上剥离,冲洗掉色素,并取下保护层,利用纳米压痕法在0.1mN的测试负载下,求出ΔC/N被测量后的各个样品的弹性塑性变形当量以及塑性变形当量,以计算出挤压塑性弹性。其结果示于表2中。
[表2]
  样品10   样品11   样品12   样品13
 弹性塑性变形当量(N·Mm)   3.64E-13   4.61E-13   3.54E-13   2.40E-13
 塑性变形当量(N·Mm)   1.57E-13   2.63E-13   5.31E-13   5.73E-13
 挤压塑性·弹性(%)   69.87   63.67   40.00   29.52
 ΔC/N(dB)   20.29   20.01   0.66   0.105
根据以上结果,如果挤压塑性、挤压弹性为40%以下,则ΔC/N为1dB以下,从而可获得不会影响调制度的保护层。

Claims (3)

1.一种光信息记录媒体,包括:基板,其中心部分具有贯通孔,且在其中一个面侧具有螺旋状的引导槽;反射层,其形成在所述基板的形成有所述引导槽的面上;记录层,其形成在所述反射层上,且由含有色素的有机物质而构成;以及形成在所述记录层上的透光性覆盖层,所述光信息记录媒体的特征在于:
所述覆盖层是由硬化树脂而形成,在25℃时,与所述记录层相对的一侧的弹性模量在34~96MPa的范围内。
2.根据权利要求1所述的光信息记录媒体,其特征在于:所述覆盖层是由第一树脂层以及弹性模量低于所述第一树脂层的第二树脂层而构成,与所述记录层相对的一侧是由所述第二树脂层而形成。
3.根据权利要求1或2所述的光信息记录媒体,其特征在于:在所述记录层与所述覆盖层之间设置着保护层,此保护层的挤压塑性、挤压弹性为40%以下。
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