CN1273666A - 光学存储介质 - Google Patents

光学存储介质 Download PDF

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CN1273666A
CN1273666A CN98809900A CN98809900A CN1273666A CN 1273666 A CN1273666 A CN 1273666A CN 98809900 A CN98809900 A CN 98809900A CN 98809900 A CN98809900 A CN 98809900A CN 1273666 A CN1273666 A CN 1273666A
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storage medium
optical storage
dyestuff
layer
described optical
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R·维斯珀
H·勒维
R·兹默曼
W·黑赛
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Bayer AG
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Abstract

可写式光学存储介质,该介质包括一层保护层、一层或多层可写入层,视需要而设的反光层以及至少一层载体层,其中,所述载体层至少含有一种染料,该染料在写及/或读时所用激光波长处,光透射率至少为70%,在比激光波长至少短100nm的所有其他可见光波长处,吸收率至少为70%。

Description

光学存储介质
本发明涉及一种可写式光学存储介质，尤其涉及一种以可一次或多次写入的具有特种载体层的光盘(CD)形式。
常规的光学存储介质，尤其是数据记录和读出均用激光进行的光盘(CD-R)，由一种透明载体、一层记录层、一层金属反射层，以及一层视需要而择用的保护层组成，其中所述记录层包括诸如Te、Bi或Mn之类的金属，或者诸如花青类染料、部花青类染料、酞菁类染料或者偶氮类染料之类的染料。数据记录系以激光透过透明载体照射来进行。在进行这一步骤过程中，记录层中被照射的各点发生变形、升华、蒸发或者改性，以至在需要时形成凹坑。在记录层和毗邻层之间，也常形成无记录的空间。可写层上一般设有由Au、Ag、Al或Cu组成的金属反射层，而可写层上又设有保护层。读出时同样透过透明载体用低能量激光照射来进行。凹坑所反射光与存储介质其余部分所反射光之间的对比度以电信号的形式读出。
常规不可写光盘(ROM型，只能读出存储信息)不包括上述可写层，而只包括那些经模压等方式已在载体上形成的、相当于所复制信息的凹坑。由此可见，二者结构颇为相似。
关于更详细的介绍，参见A.B.Marchant所著《光记录》(1990年)。
已知CD-R光盘的一个问题是，记录层的灵敏度相当高。热效应和光照射效应能够改变记录层，致使光盘不再可写及/或不再可读。因此，有些制造商建议，勿将其直接置于阳光下。机电产品生产商家则告诫，因怕DVD机中所用较短激光波长会损坏CD-R，勿在DVD播放机中播放。否则，在此之后只能错误百出地读出所存储的信息；此等错误可借助电子测试仪器测量出来，并称之为信息组差错率以及其他一些表述术语。
信息组差错率概括说明信息组的缺陷总数，而且应当尽可能地少。倘若信息组差错率数值超过220，则数据存储载体不合格。信息组差错率用光盘测试播放机来测定。更详细资料参见W.Schild所著“播放机差错，光盘差错”，载于Funkscau 23/1988。CD-R也可能变得根本不能读或写的程度。
本发明的目的是提供一种可写光学存储介质，尤其是提供一种稳定性得以改进、从而使用寿命也延长的可写入光盘。
本发明的这个目的通过提供一种可写型光学存储介质得以实现，所述可写型光存储介质包括一层保护层、一层或多层可写入层，视需要而设有的反光层，以及至少一层载体层，其特征在于，所述载体层至少含有一种染料，该染料在用于写及/或读时的激光波长情况下，光透射率至少为70％，在比激光波长至少短100nm的所有其他可见光波长情况下，光吸收率至少为70％。
为获得所需要的光吸收特性，所述载体层优选含有至少两种染料，特别优选含有三种染料。
所述染料或诸染料优选选自包括蒽醌染料和吡唑啉酮染料的染料类。尤其优选Makrolexgelb 3G(一种吡唑啉酮染料，《染料索引》第一卷：溶剂黄93)、Makrolexrot 5B(一种蒽醌染料，《染料索引》第一卷：溶剂红52，第二卷第68210号)和Hytherm Blue E(一种蒽醌染料，《染料索引》第一卷：溶剂蓝101)。
载体层材料并不至关重要，对此无特定限制。该载体层包括用于光学存储介质，尤其用于CD-R的常规材料，而且特别包括对用于写及/或读的激光具透射性的聚合物，例如(共)聚碳酸酯、聚甲基丙烯酸甲酯、聚-4-甲基戊-1-烯、无定形(非晶态)环聚烯烃、聚酯、环氧树脂、或聚丙烯酸酯。尤其使用(共)聚碳酸酯。该材料可具有凹坑及/或可控信号及/或导引通道状的信息信号，即该材料可以是承载信息信号或者不承载信息信号、经格式化或者未经格式化处理的载体。视需要还可用常用方式对该材料进行表面处理。
所述染料或诸染料可用通常的方式方法掺加到载体材料中去，例如与载体材料颗粒复配或者沉积在载体材料颗粒上。染料也可优选作为母炼胶料加入。
载体材料中染料或多种染料的浓度优选为0.1～1.4％(重量)，最优选为0.3～0.8％(重量)。所述载体用含有染料的材料作原料用常规方法成型，例如用注塑或冲压法。
如果载体层为多层，则各层优选由同一种聚合物材料构成。在此情况下，染料或各染料可加到一层载体层中，或者也可加到多层载体层中。
视需要设置为一层或多层的可写层，优选为一层或多层常规感光染料层(例如，参见EP-A 353 392、488 231及410 879)。各层含有一种或多种有机染料，例如酞菁染料、部花青染料、花青染料、吲哚羰花青、甘菊蓝和偶氮染料。举例来说，这些染料以溶于某种溶剂所成的溶液形式，用常规方式，例如旋转涂布使其沉积。举例来说，作溶剂用的有二丙酮醇、氟化醇，如四氟丙醇、丁醇或其混合物。
可写层所用的染料，不同于载体层所用的染料，特别优选花青染料。
反光层视需要而设置，它优选包括一种在所用激光波长处反光度大于80％的金属，例如金、银、铝、铜及其合金。举例来说，反光层可用诸如真空蒸镀、溅射镀、离子镀之类的气相沉积法或者类似技术来镀覆。
所述保护层包括一种耐冲击性能杰出的树脂，该树脂通常为环氧树脂、聚丙烯酸酯树脂或者硅氧烷硬树脂。该保护层通常以旋涂法涂覆树脂继而以紫外光照射进行固化而成。然而，该保护层也可包括一种柔软的材料，例如聚氨酯树脂。
各层的层厚优选为载体0.5～1.2mm、可写层至多200nm、反光层至多200nm、而保护层则为5～200nm。
写入及/或读出所用激光的波长，优选分别为760～800nm(特别优选775～785nm)和620～660nm(特别优选635～650nm)。
下列实施例进一步阐明本发明。
在25℃下，用聚碳酸酯溶于二氯甲烷所成的0.5％溶液来测定聚碳酸酯的相对粘度。
实施例
本发明实施例
以下列混合物制成载体材料：
99.6224％(重量)  粒状聚碳酸酯，Makrolon CD 2005，拜耳股
                 份公司供货，一种用含叔丁基端基的双酚A
                 制成的聚碳酸酯，平均溶液粘度为1.20(于
                 25℃二氯甲烷中测得，测定时其浓度为聚碳
                 酸酯在100ml二氯甲烷中0.5g)；
0.06513％(重量)  吡唑啉酮染料Makrolexgelb 3G(《染料索
                 引》第一卷中记载为溶剂黄93)，拜耳股份
                 公司产；
0.19746％(重量)  蒽醌染料Makrolexrot 5B(《染料索引》第
                 一卷中记载为溶剂红52)，拜耳股份公司产；
0.11501％(重量)  蒽醌染料Hytherm Blue E(《染料索引》中
                 记载为溶剂蓝101)。
将染料在闭合容器中与上述颗粒材料均匀混合，然后在WernerPfleiderer ZSK 53型双蜗杆捏合机中，将混合物在240℃温度下进行复配。
然后，在光盘注塑机中，用CD-R压型机具生产出厚约1.2mm、外径120mm的CD-R原坯。CD-R的生产，在材料温度330℃和模具100℃温度下进行，生产周期为10秒钟。该CD-R压型机设有一个螺旋状、平均宽度为75nm、平均深度为180nm及螺距为1.6μm的预设沟槽。
对CD-R原坯测量其透光度。图1表明，所用材料在小于700nm的波长处，吸收率很高。
(测量几何学：0°/漫射)。
对比例
为进行比较起见，在makrolon CD 2005基体材料中不添加染料，制造类似的CD-R原坯。图2表明，该材料的透射率在整个可见光区域内都很高(测量几何学：0°/漫射)。
继而，在CD-R原坯上涂覆一层染料层。所用染料是富士公司供应的花青染料OM57，它与日本Kayaku公司供应的kayasorb IPG-022猝灭剂一起使用。该染料与猝灭剂(quencher)之比为20∶1。染料/猝灭剂的沉积以旋转涂布法用双丙酮醇溶液来进行，涂布条件要选择得能形成150nm的染料层平均厚度。
然后，在染料层上蒸镀60～80nm厚的金层。此金层上又涂有厚约10μm的保护漆。
接着，在Yamaha 100型CD-R刻写机上，以4倍写/读比，对分别由本发明和由对比试验所制得的CD-R，进行写入。继而，用ISEDD试验用播放机测量CD-R的信息组差错率(BLER)，所述ISEDD试验用播放机由Bielefeld城的环境技术与测量技术工程师办公室提供，测量时将一台飞利浦(Philips)播放机和一台索尼(Sony)播放机一起用。
正如下列表1所示，CD-R的质量处于差不多水准：表1
                 BLER(Sony)              BLER(Philips)本发明CD-R           60                      59基体材料中无染料的CD-R               62                      64
接着，按照ISO 4892-2对本发明CD-R及对比例CD-R进行光照试验。在下列试验条件下，使光透过基体材料，照到CD-R染料层，进行照射：
装置：             Atlas Xenon-WOM
光源：             XENON牌灯泡，6.5KW(v.Atlas)
照射强度：         0.35W/(m2*nm)，以340nm波长测得
滤光：             Pyrex/Pyrex
黑色标准温度：     65℃
试验室温度：       42℃
空气相对湿度：     65％
喷雾周期：         102/18分钟
而后，再用ISEED试验播放机测量信息组差错率。
对比组CD-R的信息组差错率(BLER)，在光照约10小时以后就显著增大。在光照时间约20小时后，BLER值约为500，也即超出标准所规定范围。
在实际高达50小时的光照时间以后，本发明CD-R的BLER也并未增加。

Claims (10)

1.可写式光学存储介质，该介质包括保护层、一层或多层可写入层，视需要设置的反光层以及至少一层载体层，其特征在于，所述载体层至少含有一种染料，该染料在写及/或读所用激光波长处，有至少70％的透射率，在比激光波长至少短100nm的所有其他可见光波长处，吸收率至少为70％。
2.权利要求1所述的光学存储介质，其特征在于，所述载体层至少含有两种染料。
3.权利要求1或2中任何一项所述的光学存储介质，其特征在于，所述透射率至少为80％，优选为85％，吸收率至少为90％，优选为95％。
4.权利要求1至3中任何一项所述的光学存储介质，其特征在于，写及/或读所用激光的波长为760～800nm，优选为775～785nm。
5.权利要求1至3中任何一项所述的光学存储介质，其特征在于，所述写及/或读所用激光的波长为620～660nm，优选为635～650nm。
6.权利要求1至5中任何一项所述的光学存储介质，其特征在于，所述一种或多种染料选自蒽醌染料或者吡唑啉酮染料。
7.权利要求1至6中任何一项所述的光学存储介质，其特征在于，所述一种或多种染料选自Makrolexgelb 3G，Makrolexrot 5B，或者Hytherm Blue E。
8.权利要求1至7中任何一项所述的光学存储介质，其特征在于，所述载体层含有0.1～1％(重量)染料。
9.权利要求1至8中任何一项所述的光学存储介质，其形式为可一次或多次写入的光盘。
10.权利要求9所述的光学存储介质，其特征在于，所述可写入层由与上述一种或多种染料不同的感光性染料组成。
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CN102399456A (zh) * 2010-08-31 2012-04-04 通用电气公司 附接的染料在光学数据存储介质中的用途
CN101477810B (zh) * 2007-11-15 2012-08-29 汤姆森特许公司 页定向的光学数据存储系统中的信息的移位不敏感存储
CN112002782A (zh) * 2020-08-28 2020-11-27 河南师范大学 一种基于MnBi2Te4单层的纳米尺度光电传感器

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CN101477810B (zh) * 2007-11-15 2012-08-29 汤姆森特许公司 页定向的光学数据存储系统中的信息的移位不敏感存储
CN102399456A (zh) * 2010-08-31 2012-04-04 通用电气公司 附接的染料在光学数据存储介质中的用途
CN102399456B (zh) * 2010-08-31 2014-11-05 通用电气公司 附接的染料在光学数据存储介质中的用途
CN112002782A (zh) * 2020-08-28 2020-11-27 河南师范大学 一种基于MnBi2Te4单层的纳米尺度光电传感器

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