CN1192376C - 信息记录载体及其制造方法 - Google Patents

信息记录载体及其制造方法 Download PDF

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Publication number
CN1192376C
CN1192376C CNB981179134A CN98117913A CN1192376C CN 1192376 C CN1192376 C CN 1192376C CN B981179134 A CNB981179134 A CN B981179134A CN 98117913 A CN98117913 A CN 98117913A CN 1192376 C CN1192376 C CN 1192376C
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China
Prior art keywords
resin
layer
information recording
protective seam
substrate
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Expired - Fee Related
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CNB981179134A
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English (en)
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CN1208225A (zh
Inventor
近藤哲也
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Victor Company of Japan Ltd
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Victor Company of Japan Ltd
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Abstract

信息记录载体具有至少一个细图形排的基底。在基底上依次重叠记录层、防分层层和保护层。在制造中，记录层首先形成在基底上，然后第一树脂涂覆在记录层上。固化第一树脂形成防分层层。接着第二树脂涂覆在防分层层上，然后固化第二树脂形成保护层。

Description

信息记录载体及其制造方法
一技术领域
本发明涉及例如光盘的信息记录载体及其制造方法。
二.背景技术
通常，已存在用于记录可读信息和读取已记录信息的盘信息记录载体，近年，盘信息记录载体的密度已极大增长。信息记录载体包括例如磁盘、光盘、静电容盘和类事物的各种盘；尤其是光盘的发展是惊人的。
随着个人计算机性能的最新发展，记录重要信息在这些高密度信息记录载体上的机会已增加。然而，安全问题仍然存在。
这些高密度信息记录载体具有的主要优点是大量信息能够记录在一个盘上。然而，它们具有容易被市售生产设备复制的缺点。特别是，含有关于例如用户银行存款、电子化货币这样的人民财产的大量敏感信息的高密度信息记录载体的原始盘容易被盗并被大量复制仿造以供给感兴趣的团体。完全防止这种犯罪是不可能的。所以，总是存在侵犯用户秘密的危险和金融交易不稳的感觉。这回过来影响商业交易的稳定性并导致欺诈的金融交易的损失。
相应地，需要用于防止装有重要信息的高密度信息记录载体的非法复制的方法。作为解决此问题的装置，已提出使用密码的各种复制保护系统。这些系统防止信息被电子复制。密码的提议使复制这些信息困难。与此相对应，物理方法开始用于非法复制。在该方法中，使盘分层，信息表面暴露，因此该信息转移到另一盘上。该盘作为模子把信号转移到另一平的塑料盘上。此模子能重复使用，能够精确制造与原始信号图形相同的大量信号图形。因此，除电子复制外，也存在复制全部信息的物理方法，并且还没有对此的防止方法。
图1示意说明光盘的结构。如图1所示，光盘A由把记录层2(反射膜)和保护层3顺序地重叠在基底1上构成。在基底1上的信号表面包括细图形列1A。在例如盘A的光盘中，基底1和记录层2之间的界面能分层。通常，用保护层3来实现与记录层2的足够粘合作用，并且保护层3足够硬以起保护层的作用。然而，基底1和和记录层2之间的界面有较弱的粘和力。通过用胶带仔细使盘分层就能使基底1的表面暴露。记录层2由蒸发或溅射法，或类似方法形成在基底1上，在实现好的粘合作用的同时，后者的粘和力足够弱，用胶带能使信号表面暴露。
三.发明内容
本发明目的是提供一种结构的信息记录载体及其制造方法，该结构能够通过防止即使在使用胶带时在基底1和记录层2之间界面处的记录层2分层来防止物理复制(仿造)。
本发明给具有基底的信息记录载体提供至少一个细图形排，该载体包括依次重叠在基底上的记录层、防分层层和保护层。
而且，本发明提供一种信息记录载体的制造方法，包括步骤：由至少一个细图形排在基底上形成记录层；在记录层上涂覆第一树脂，固化涂覆在记录层上的第一树脂来形成防分层层；在防分层层上涂覆第二树脂；固化涂覆在防分层层上的第二树脂来形成保护层。
四.附图说明
图1示意说明现有光盘的结构；
图2示意说明根据本发明的信息记录载体的结构；及
图3是说明在实施例1-8和实验样品1-11中的分层实验结果的表。
五具体实施方式
参照附图，下面将描述根据本发明的信息记录载体及其制造方法。与上述部件相对应的部件用相同标号表示并省略其说明。
将以下面顺序描述根据本发明的信息记录载体及其制造方法：(1)信息记录载体(实施例1-8)；(2)信息记录载体的制造方法；以及(3)信息记录载体(实施例9-19)
(1)信息记录载体
根据本发明的信息记录载体是图2所示的光盘AA，它包括后面将描述的、没有间隙的插入在记录层2和保护层3之间的防分层层4。换句话说，光盘AA，即图2所示的根据本发明的信息记录载体，通过在基底1上顺序地重叠记录层2(反射层)、防分层层4和保护层3构成。基底1上的信号表面包括细图形排1A。
防分层层4插入在记录层2和保护层3之间使它不能在基底1和记录层2之间的界面处分层。能实现此是因为防分层层4和保护层3使用不同延伸率的树脂。防分层层4使用延伸率100％-300％的挠性树脂，而保护层3使用延伸率5％或更小的非挠性树脂。因此，因为由保护层3处分层引起的任何剪切应力在下层(防分层层4)上分散和吸收，所以在基底1和记录层2之间界面处的分层是不可能的。
如果延伸率大于5％的挠性树脂用作保护层3，保护层3的表面将变得极软，外侧易受划伤，因此由延伸率5％或更低来形成硬保护层3。
在分层实验后的光盘显微检测中表明上层(保护层3)已断裂并且碎片仍然极牢地粘在下层上(防分层层4)。没有发现下层分层的证据。因为防分层层4和记录层2之间的粘合力总是恒定，在基底1和记录层2之间界面处的分层是不可能的。因此，很大程度肯定地防止非法复制具有基底1的光盘AA。
[实施例1-8与实验样品1-11的比较]
通过与实验样品1-7比较来描述根据本发明信息记录载体的实施例1-8。
[实施例1-8]
在这些实施例中的光盘AA应用于CD-ROM。
光盘AA的基底1由厚1.2mm的聚碳酸脂构成。细图形排1A以螺旋形式或同心形式刻在基底1的表面上。雕刻细图形排1A(线宽度0.6μm)作为信息。使用铝和厚70nm的记录层2通过溅射形成在基底1上。厚度5μm-10μm的防分层层4形成在记录层2的顶面上。厚度5μm-10μm的保护层3形成在防分层层4的顶面上。
防分层层4和保护层3包括后面将要描述的树脂A-树脂E、树脂α和树脂β，并且所有的树脂调节成受紫外光照射时固化。通过涂覆树脂B、C、D和E在记录层3上(旋转涂覆)和固化所涂覆的树脂B、C、D和E(紫外照射)来形成防分层层4。通过涂覆树脂α和β在已固化的防分层层4上(旋转涂覆)和固化所涂覆的树脂α和β(紫外照射)来形成保护层3。高压汞弧灯的2,000mJ紫外线用于照射。
图3所示的分层实验方法包括用切割刀以1mm间隔在保护层3的表面刻线来形成水平和竖直线的栅格图形，从而形成100个正方形(实验件)。因此，在防分层层4、记录层2和基底1的表面进行刻痕。进行此操作直到同JIS-K5400中所描述的那样。在JIS-K5400中，为进行刻痕计算切割后分层的正方形数目，同时在根据本发明的信息记录载体(光盘)的该分层实验中，聚酰亚胺透明胶带5413(具有粘合力700g/25mm)粘在正方形上，然后除去。
在同样的地方进行此实验10次，即使单个正方形分层，该正方形规定为“不好(NG)”。该实验方法比JIS-K5400严格许多。该方法包括用切割刀切割保护层3，并用胶带在保护层3的同样地方上进行重复的分层实验，因此极大地增加了保护层3的剥离机会。
防分层层4和保护层3包括图3所示的树脂的组合：树脂A-树脂E、树脂α和树脂β。在图3中，“NG”表示在基底1和记录层2之间出现的分层，同时“OK”表示在基底1和记录层2之间没有出现分层。
如图3所示，在实施例1-4中，树脂B、C、D和E用来构成防分层层4，同时树脂α用来构成保护层3。在实施例5-8中，树脂B、C、D和E用来构成防分层层4，同时树脂β用来构成保护层3。实施例1-8的分层实验结果是满意的(“OK”)。
树脂A厖延伸率50％(3％光引发剂Darocur1173(Merck JapanLimited)加入单体M-5500(Toagosei Chemical Industry)。)
树脂B厖延伸率100％(紫外固化型成分，UV-3630(Toagosei ChemicalIndustry))
树脂C厖延伸率150％(3％光引发剂Darocur1173(Merck Japan Limited)加入单体CL-50(Nippon Kayaku Co.，Ltd.)。)
树脂D厖延伸率200％(3％光引发剂Darocur1173(Merck JapanLimited)加入单体U-340A(Shin-Nakamura Chemical Co.，Ltd.)。)
树脂E厖延伸率300％(3％光引发剂Darocur1173(Merck Japan Limited)加入单体M-5700(Toagosei Chemical Industry)。)
树脂α厖延伸率0-5％。此误差范围出现是因为此值很小。(紫外固化型成分，SD-1700(Dainippon Ink and Chemicals，Inc.))树脂β厖延伸率0-5％。
此误差范围出现是因为此值很小。(紫外固化型成分，XR-11(SumitomoChemical Co.，Ltd.))
根据JISK-6301进行延伸率测量。
[实验样品1-7]
在实验样品1-7中，用于防分层层4和保护层3的树脂不同于用于实施例1-8中的。除此之外，实验样品1-7的盘结构类似于实施例1-8中所用的。如图3所示，对于实验样品1-7，树脂α，β，A，β，β，β和β构成防分层层4，及树脂β，α，α，B，C，D和E构成保护层3。实验样品1-7的全部分层实验结果是“NG”。
[实验样品8-11]
在实验样品8-11中，为图1所示的光盘A中的保护层3选择适当的厚度和树脂。光盘A的基底1由厚1.2mm的聚碳酸脂构成，并且记录层2由厚70nm的铝构成。如图3所示，对于保护层3，实验样品8使用厚8μm的树脂α；实验样品9使用厚8μm的树脂β；实验样品10使用厚16μm的树脂α；和实验样品11使用厚16μm的树脂β。全部实验样品8-11的的分层实验结果是“NG”。
在实验样品1-11的全部分层实验结果是“NG”时，实施例1-8的全部分层实验结果是“OK”。因此，通过在实施例1-8的防分层层4和保护层3中使用该树脂，防分层层4和和记录层2总是保持牢固地粘结状态，不可能在基底1和记录层2之间的界面处分层。这样，得到了防止非法复制具有基底1的光盘AA的可靠方法。
如上所述，在通过重叠延伸率100％-300％的树脂防分层层4和延伸率5％或更少的树脂保护层3构造的盘中没有发现分层，这表明已实现防分层。在仅示出延伸率高达300％的树脂构成防分层层4的同时，由延伸率大于此(300％-1000％)的树脂构成防分层层4也将得到同样结果。该树脂由主要成分单体和用于固化的聚合引发剂构成。例如在树脂E中，单体是M-5700，而聚合引发剂是Darocur1173。树脂B、树脂α和树脂β是包含引发剂的复合物。本发明最重要的特性延伸率主要是由所用单体种类决定的。然而考虑实用性，可加入各种未饱和乙烯树脂来调节粘度，但数量在本发明规定的范围内。而且，各种单体可作为粘合剂加入，但数量在本发明规定的范围内。
类似于后面将描述的实施例13，必须考虑从信号表面侧读取数据的该类光盘的保护层3和防分层层4的可透性。详细地说，用于数据读取或写的激光波长范围内的光束从拾光镜发射，透过保护层3和防分层层4，到达记录层2，由记录层2反射，透过保护层3和防分层层4，并返回拾光镜。保护层3和防分层层4要求至少70％的穿透率以使光束由此通过。低于70％的穿透率将导致信号输出下降几乎一半(0.7×0.7＝0.49)。对于低反射率的记录层2，保护层3和防分层层4的理想穿透率是90％或更大。
用一石英玻璃的实验片和在石英玻璃上依次重叠防分层层4和保护层3制得的另一实验片就能测量穿透率。通过覆盖红外线到紫外线范围内波长的透射型单色光镜测量透过两个实验片的光量。单色光镜用透过一个实验片的光量与透过另一实验片的光量之比来确定穿透率。可测量波长是用于记录或重放激光波长的一个，例如，830nm，780nm，650nm，635nm，532nm，430nm，410nm和370nm。
不饱和乙烯树脂的例子包括单官能丙烯酸盐(异丁烯酸盐)、2-官能丙烯酸盐(异丁烯酸盐)、3-官能丙烯酸盐(异丁烯酸盐)、4-官能丙烯酸盐(异丁烯酸盐)、6-官能丙烯酸盐(异丁烯酸盐)和类似物。具体地，单官能丙烯酸盐的例子包括2-乙基己基丙烯酸盐、2-羟乙基丙烯酸盐、乙烯基吡咯烷酮、叔丁基丙烯酸盐和异冰片基丙烯酸盐。2-官能丙烯酸盐的例子包括乙二醇二丙烯酸盐、聚乙二醇二丙烯酸盐、1，4-丁二醇二丙烯酸盐、1，5-戊二醇二丙烯酸盐、1，6-己二醇二丙烯酸盐和1，10-葵二醇二丙烯酸盐。3-官能丙烯酸盐的例子包括甲基丙三醇三丙烯酸盐、季戊四醇三丙烯酸盐和丙三醇三丙烯酸盐。4-官能丙烯酸盐的例子包括四甲基醇甲烷四丙烯酸盐。6-官能丙烯酸盐的例子包括二季戊四醇六丙烯酸盐。这些官能团(丙烯酰)可由甲基丙烯酰代替。
用于实施例中的聚合引发剂是与紫外固化相对应的光促进剂。然而，在此所用的聚合促进剂不限于Darocur1173(2-羟基-2-甲基-1-苯基丙烷-1-酮)。可使用例如苄基、安息香、苯酮、4-甲氧基苯酮、苄基二甲基缩酮、苯偶姻乙醚、苯偶姻异丙迷、millaseketone、蒽醌、2-甲基蒽醌、苯乙酮、α，α-二氯-4-苯氧基苯乙酮、叔丁基三氯苯乙酮、甲基正苯甲酰基苯甲酸盐、2-氯硫代咕吨酮和2，4-二甲基硫代咕吨酮。能混合这些聚合促进剂，不仅用于紫外固化，而且用于γ射线、电子射线和微波固化。如果需要，胺化合物可作为聚合促进剂加入。
当该聚合促进剂用于热固时，通常的聚合促进剂(例如，偶氮二异丁腈)是混合的，不是上述聚合促进剂。
日本专利特开No.81702/1993公开了具有两个保护膜的信息记录载体，该膜的上表面层具有高表面硬度而下(内)表面层具有附着力。在该文献中描述的盘的结构类似于本发明，但是为了提高磁场调制型光磁盘的CSS作用，它的特征在于具有高表面硬度(比HB铅笔芯硬)的表面层，并且该例子示出了H和2H的铅笔硬度。
特开专利仅把内表面层描述成与金属具有良好附着力的树脂，而没提及关于物理性能和材料的限制。给出SD-101和SD-301作为保护膜的例子，但通常用于光盘，并且其延伸率在0-5％的范围内，因此太低而不能测量。没有描述表面层和内表面层的延伸率并且没有提及平衡两层的物理性能或在平衡和分层之间的关系，以及该调整如何能导致防止分层。按照JIS-K5400对实验样品进行附着力实验，该实验条件不比本发明严格。如上所述，本发明的目的、物理性能结构和效果完全不同于现有技术。
(2)信息记录载体的制造方法
将描述根据本发明的信息记录载体的制造方法。下面的说明将集中在在记录层2上形成防分层层4的工艺以及在防分层层4上形成保护层3的工艺，这是本发明的两个主要部分。制造盘的其他工艺(形成基底1和记录层2的工艺)是公知的，将省略对其的说明。
根据本发明的信息记录载体的制造方法按照下面顺序进行：防分层层4(挠性层)施加在记录层2(反射层)上；固化防分层层4；保护层3施加在防分层层4上；固化保护层3。实验表明当省略防分层层4的固化时附着力极大降低。
施加防分层层4和保护层3的优选方法是旋转涂覆法、棒涂覆法、辊涂覆法、溅射法、浸渍法或印刷法。用于防分层层涂覆的每个方法的特征如下：
旋转涂覆法的优点是通过调节旋转速度(rpm)和旋转时间能够容易地设定膜厚度。然而，防分层层4的高粘度意味着旋转速度需要设定得高，这样很不适合批量生产。然而，它也有能够分享现有光盘生产线设备的优点。在棒涂覆法中，通过棒的粗糙度和扫描速度确定膜厚度。它要求的设备简单并能很快完成，但同时也有容易留下棒的痕迹的缺点。
在辊涂覆法中，膜厚度通过辊之间的间隙和旋转速度确定，甚至对于高粘度也能提供快的生产组织。该方法能够形成整洁层的光滑表面。溅射法要求最低的设备成本，但提供高表面粗糙度并容易使工作环境很脏。浸渍法仅通过把盘浸入溶液中完成，该方法使设备成本低，但溶液也会在膜的背面。印刷法(例如丝网印刷)是最好，它提供高粘度并仅覆盖膜的表面，使表面整洁。而且设备成本相对低。在考虑这些膜施加方法的优缺点后用户可选择他或她感觉最适合的方法。
如上所述，固化防分层层4和保护层3的方法使用紫外光，但不局限于此。也可使用包括可见光、微波或γ射线、或电子射线的照射，它们全部用于快速固化。固化防分层层4和保护层3的方法可使用炉加热法。在该方法中需要加入热聚合引发剂，在约50℃-150℃的温度下进行固化。该方法要求固化时间比紫外光、电子射线或微波照射长10-100倍，但设备成本低。加热温度越高，固化时间越短。效果清楚示出的温度是50℃或更高。更高的温度将弄弯基底，影响信号读取性能。聚碳酸脂具有140℃的熔点，在极短时间内热固要求高达150℃的温度。考虑基底中的弯曲，最优选的固化温度是50℃-80℃。传统的加热能用于固化，但在直接和局部加热方面红外加热是有效的。
上述实施例1-8试图示出本发明的基本结构，因此本发明不局限于此。例如，印刷膜也可涂覆在保护层3上。用于在记录层2上涂覆防脱层层4和保护层3的区域可以逐渐变化，从而防脱层层4的边缘突出至记录层2的边缘之外，而且，保护层3的边缘突出至防脱层层4的边缘之外。而且，防划痕层、抗静电层(电)、弯曲校正层、或防潮层也可形成在基底1的读取表面上。
关于实施例1-8的描述假设使用例如CD-ROM的只读光盘，它们同样可应用于磁光盘(例如，MD数据)或相变(转换)盘(例如，PD)，或一次性可写盘(例如，CD-R)。当使用这种盘时，能用具有适当记录功能的膜代替记录层2。上述方法也可应用于通过连续擦除写数据来改变信息的盘或应用于如DVD-ROM、DVD-RAM和DVD-R这样的层叠结构的盘。通过把本发明与已有的防复制方法结合就能产生复杂的保密系统。
(3)信息记录载体
将具体说明根据本发明可应用于许多种盘的信息记录载体。
根据本发明的信息记录载体同图2所示的光盘AA有相同结构，并通过在具有细图形排的信号表面的基底1上依次重叠记录层2(反射膜)、防分层层4和保护层3构成。
除此结构外，记录层2由包括光反射膜、磁光膜、相变膜、染料膜或它们的任何组合的单层或多层结构构成。这些膜能用于下面光盘：
[只读介质]
使用光反射膜的只读介质能采用铝、金、银、铜、镍、铬、硅、钛、钽、使用这些金属作为主成分的合金、SiN、SiC、SiO、SiON、SiAlON、或类似物。
[磁光介质]
使用磁光膜的磁光介质能采用层叠膜，该层叠膜具有象TbFeCo、GdFeCo、DyFeCo、TbCo和TbFe这样的过渡金属和稀土合金的交替层，或钴和铂的交替层。能用Ho、Er、Yb和Lu替代过渡金属。而且，例如Bi和Sn能加入过渡金属中。
[相变介质]
使用相变膜的相变介质能采用例如GeSbTe、GeTe、GeTeS、GeSnTe、GeSnTeAu、GeSeS、GeSeAs、SbTe、SbSeTe、SeTe、SeAs、InTe、InSe、InSb、InSbSe、InSbTe、AgInSbTe或CuAlTeSb这样的硫族合金。
[一次性可写染色介质]
使用染料膜的一次性可写染色介质能采用花青染料、酞花青染料、萘花青染料、偶氮染料、萘醌染料或类似物。
[一次性可写相变介质]
使用相变膜的一次性可写相变介质能采用如Te、Bi、TeO或TeC这样的低熔点金属或合金。为提高重放输出，可用光干涉膜(例如SiN、SiO、ZnS、ZnSSiO、AlO、MgF、InO和ZrO)和光反射膜(例如铝和金)层叠磁光介质、相变介质、一次性可写染色介质和一次性可写相变介质。而且，为了能高密度记录/重放，可用已知高分辨率掩膜或对比增强膜层叠这些介质。
下面描述使用磁光介质、相变介质、一次性可写染色介质和一次性可写相变介质作为记录层2的盘的实施例。
[实施例9]
实施例9应用于磁光盘。
基底1是丙烯酸的且1.2mm厚。细图形(凹槽线宽度1.0μm；并且轨道间距1.6μm)1A作为信息刻在基底1的表面上。厚90nm的磁光膜TbFeCo和厚80nm的光干涉膜SiO通过溅射法形成在基底1的信号表面上，从而形成记录层2。通过溅射法用树脂B形成防分层层4的膜，其厚是20μm。以实施例1相同的方式进行固化法。保护层3的材料、膜形成方法和固化法与实施例1中所用的相同。一旦盘完成，进行上述分层实验。结果是满意的。
[实施例10]
实施例10应用于相变光盘。
通过混合聚碳酸脂和聚苯乙烯制得基底1，厚1.2mm。细图形(凹槽宽度0.4μm；并且轨道间距1.6μm)1A作为信息刻在基底1的表面上。。厚100nm的相变膜AgInSbTe通过溅射法形成在基底1的信号表面上，从而形成记录层2。除了使用棒涂覆法形成防分层层4外以与实施例3的同样方式形成防分层层4，其厚是15μm。以实施例3相同的方式形成保护层3。然后进行上述分层实验。结果是满意的。
[实施例11]
实施例11应用于一次性可写盘CD-R。
基底1是聚碳酸脂的且1.2mm厚。细图形(凹槽宽度0.6μm；并且轨道间距1.6μm)1A作为信息刻在基底1的表面上。厚150nm的一次性可写偶氮染料膜通过旋转涂覆法形成在基底1的信号表面上，从而形成记录层2。并且通过蒸发法形成60nm厚的银膜，用作光反射膜。通过把5％偶氮二异丁腈热固剂加入单体CL-50中，然后用辊涂覆法辊压在记录层2上来形成厚9μm的防分层层4，通过传送过70℃的炉中30分钟来固化防分层层4。用旋转涂覆法在防分层层4上涂覆厚7μm的树脂β形成保护层3，并用类似于实施例1的紫外灯固化。以上述同样方式进行分层实验。结果是满意的。
[实施例12]
实施例12应用于一次性可写盘CD-R。
基底1是聚碳酸脂的且1.2mm厚。细图形(凹槽宽度0.6μm；并且轨道间距1.6μm)1A作为信息刻在基底1的表面上。厚120nm的一次性可写花青染料膜通过旋转涂覆法形成在基底1的信号表面上，从而形成记录层2。并且进一步通过溅射法形成70nm厚的金膜，用作光反射膜。用旋转涂覆法在记录层2上涂覆厚12μm的树脂B，形成防分层层4。然后用微波照射5分钟固化。用旋转涂覆法在防分层层4上涂覆厚7μm的树脂β形成保护层3，并用类似于实施例1的紫外灯固化。以上述同样方式进行分层实验。结果是满意的。
[实施例13]
实施例13应用于从信号表面侧读取数据的超高密度只读盘。
基底1是聚碳酸脂的且1.2mm厚。细图形(凹坑宽度0.15μm；具有十个不同长度的凹坑；并且轨道间距0.4μm)1A作为信息刻在基底1的表面上。厚60nm的光反射膜AlTi通过溅射法形成在基底1的信号表面上，从而形成记录层2。并且通过丝网印刷法在记录层2上涂覆厚30μm的树脂C，形成防分层层4。然后用实施例1相同的方式用紫外灯固化。进行涂覆和固化三次。用旋转涂覆法在防分层层4上涂覆厚10μm的树脂β形成保护层3，并用类似于实施例1的紫外灯固化。以上述同样方式进行分层实验。结果是满意的。制备包括防分层层4和保护层3的叠层的石英玻璃。对于532nm波长的光，石英玻璃的透射率实验示出82％的透射率。
[实施例14]
实施例14应用于短波长相配的磁光盘。
基底1是玻璃且厚1.2mm。细图形(凹槽宽度0.4μm；轨道间距0.9μm)1A作为信息刻在基底1的表面上。两种磁光介质钴膜(0.5nm)和铂膜(0.5nm)通过溅射法在基底1的信号表面上交替层叠形成20层，从而形成记录层2。通过喷涂法在记录层2上涂覆20μm厚的树脂D，形成防分层层4。然后用电子射线连续照射30秒固化。用于保护层3的材料、成膜方法和固化方法与实施例1中所用的相同。一旦盘完成，进行上述分层实验。结果是满意的。
[实施例15]
实施例15应用于短波长相配的磁光盘。
基底1是由一种非晶聚烯烃Zeonex280构成且厚1.2mm。细图形(凹槽宽度0.4μm；轨道间距0.9μm)1A作为信息刻在基底1的表面上。厚80nm的光干涉膜SiN、厚90nm的磁光膜NdFeCo、厚80nm的光干涉膜SiN和厚80nm的光反射膜AlTa通过溅射法涂覆在基底1的信号表面上形成记录层2。以实施例2相同的方式形成防分层层4和保护层3。一旦盘完成，进行上述分层实验。结果是满意的。
[实施例16]
实施例16应用于高密度的磁光盘ASMO。
基底1是聚碳酸脂的且厚0.6mm(假如中心夹持部分厚1.2mm)。细图形(凹槽宽度0.3μm；轨道间距0.6μm)1A作为信息刻在基底1的表面上。厚80nm的光干涉膜SiN、厚40nm的磁光膜GdFeCo、厚60nm的磁光膜TeFeCo、厚60nm的光干涉膜SiN和厚70nm的光反射膜AlTi通过溅射法涂覆在基底1的信号表面上形成记录层2。为降低粘度，10％1.6-己二醇二丙烯酸脂单体加入树脂D，用旋转涂覆法形成7μm厚防分层层4。以实施例1相同方式固化防分层层4。用于保护层3的材料、成膜方法和固化法与实施例1相同。为校正弯曲和防潮，通过溅射法在基底1的读取表面上形成SiO层。以上述同样方式进行分层实验。结果是满意的。
[实施例17]
实施例17应用于层叠的相变盘DVD-RAM。
基底1是聚碳酸脂的且厚0.6mm。细图形(凹槽宽度0.7μm；轨道间距1.48μm)1A作为信息刻在基底1的表面上。准备两个基底1，厚90nm的光干涉膜ZnSSiO、厚20nm的相变膜GeSbTe、厚20nm的光干涉膜ZnSSiO和厚150nm的光反射膜AlCr通过溅射法形成在基底1的每个信号表面上用作记录层2。以实施例8的同样方式形成防分层层4和保护层3。厚30μm的SK-7000(SonyChemical)通过丝网印刷法印制在保护层3上并用500mJ紫外光照射。用其他盘层叠并压制在其上。使该层叠盘竖立经过24小时时效。一旦盘完成，用切割刀把它分成两个半盘。进行上述分层实验。结果是满意的。
[实施例18]
实施例18应用于双层只读型层叠盘DVD。
基底1是聚碳酸脂的且厚0.6mm。细图形(凹坑宽度0.3μm；具有十个不同长度的凹坑；轨道间距0.74μm)1A作为信息刻在基底1的表面上。准备两个基底1。厚14nm的光反射膜，即金膜，通过溅射法形成在一个基底1的信号表面上当作记录层2，并且厚60nm、主要包括铝的合金A6061通过溅射法形成在另一基底1的信号表面上当作光反射膜。厚15μm的树脂E通过旋转涂覆形成在每个记录层2上，并以实施例1的同样方式固化。用旋涂器低速旋转半盘中的一个，树脂α涂覆到此当作保护膜和粘合剂。用另一半盘层叠该半盘，同时在旋转期间避免任何气泡侵入，并以1500rpm旋转该层叠盘除去过量树脂。1000mJ紫外光从金膜侧施加于此，从而完成粘结及完成该盘。金膜和A6061膜之间的树脂厚度是45μm。然后用切割刀把该层叠盘分成两个半盘。进行上述分层实验。结果是满意的。
[实施例19]
实施例19应用于双层只读型层叠盘DVD。
基底1是聚碳酸脂的且厚0.6mm。细图形(凹坑宽度0.3μm；具有十个不同长度的凹坑；轨道间距0.74μm)1A作为信息刻在基底1的表面上。准备两个基底1。厚40nm的光反射膜SiN通过溅射法形成在一个基底1的信号表面上，形成记录层2。并且厚100nm的铬膜通过溅射法形成在另一基底1的信号表面上当作光反射膜。厚20μm的树脂E通过旋转涂覆形成在每个记录层2上，并以实施例1的同样方式固化。用旋涂器低速旋转半盘中的一个，树脂β涂覆到此当作保护膜和粘合剂。用另一半盘层叠该半盘，同时在旋转期间避免任何气泡侵入，并以2000rpm旋转该层叠盘除去过量树脂。1000mJ紫外光从涂SiN的基底侧施加于此，从而完成粘结及完成该盘。SiN膜和铬膜之间的树脂厚度是45μm。然后用切割刀把该层叠盘分成两个半盘。进行上述分层实验。结果是满意的。
上述构成的根据本发明的信息记录载体由重叠在记录层上的延伸率100％-300％的树脂防分层层和延伸率5％或更少的树脂保护层组成；因此，例如，甚至用胶带也不能在基底和记录层之间界面处使记录层分层。由此防止通过物理复制法非法复制盘，并提供了信息记录载体的制造方法。
而且，因为记录层包括单层，或光反射膜、磁光膜、相变膜或染料膜的一个或组合的层叠结构，，所以在具有这种记录层的盘中能防止基底的物理复制法。

Claims (14)

1.一种具有基底的信息记录载体，该基底具有至少一个细图形排，该信息记录载体包括依次重叠在基底上的记录层、防分层层和保护层，其中防分层层与保护层没有间隙地直接接触，其中防分层层包括延伸率100％-200％的树脂，以及保护层包括延伸率5％或更小的树脂，其中所述延伸率是通过JISK6301测定的。
2.根据权利要求1的信息记录载体，其中记录层包括至少任何光反射膜、磁光层、相变膜或染料膜中一种的单层或多层结构。
3.根据权利要求2的信息记录载体，其中光反射膜包括铝、金、银、硅、钛、钽或铬。
4.根据权利要求2的信息记录载体，其中光反射膜包括任何铝、金、银、硅、钛、钽或铬的合金。
5.根据权利要求2的信息记录载体，其中磁光膜包括TbFeCo、GdFeCo、NdFeCo、钴和铂中的至少一种。
6.根据权利要求2的信息记录载体，其中相变膜包括至少GeSbTe或AgInSbTe。
7.根据权利要求2的信息记录载体，其中染料膜包括至少花青染料或偶氮染料。
8.根据权利要求1的信息记录载体，其中防分层层包括至少辐射固化树脂、热固树脂或电子射线固化树脂。
9.根据权利要求1的信息记录载体，还包括设在保护层上的实验片，使在受到使实验片分层的分层实验时记录层不从基底分层。
10.根据权利要求1的信息记录载体，分层层和保护层两层具有70％或更大的光透射率。
11.一种制造信息记录载体的方法，包括下列步骤：
在具有至少一个细图形排的基底上形成记录层；
涂覆第一树脂在记录层上，其中第一树脂包括延伸率100-200％的树脂，其中所述延伸率是通过JISK6301测定的；
固化涂覆在记录层上的第一树脂形成防分层层；
在防分层层上涂覆第二树脂，其中第二树脂包括延伸率为5％或更小的树脂，其中所述延伸率是通过JISK6301测定的；及
固化涂覆在防分层层上的第二树脂形成保护层以令该保护层与防分层层没有间隙地直接接触。
12.根据权利要求11的制造信息记录载体的方法，其中涂覆第一树脂的步骤是使用旋转涂覆法、棒涂覆法、辊涂覆法、喷涂法、浸渍法或印制法来进行。
13.根据权利要求11的制造信息记录载体的方法，其中固化第一树脂的步骤是使用辐射照射法、电子射线照射法或烘干法，或它们的组合来进行。
14.根据权利要求13的制造信息记录载体的方法，其中烘干法是通过在50℃-150℃温度下的加热器或红外线来完成。
CNB981179134A 1997-07-29 1998-07-29 信息记录载体及其制造方法 Expired - Fee Related CN1192376C (zh)

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