CN1263017C - 光信息记录媒体和其制造方法及光信息记录再现方法 - Google Patents

光信息记录媒体和其制造方法及光信息记录再现方法 Download PDF

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CN1263017C
CN1263017C CNB02151805XA CN02151805A CN1263017C CN 1263017 C CN1263017 C CN 1263017C CN B02151805X A CNB02151805X A CN B02151805XA CN 02151805 A CN02151805 A CN 02151805A CN 1263017 C CN1263017 C CN 1263017C
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information recording
brane
optical information
recording media
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CN1438638A (zh
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久田和也
林一英
大野锐二
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

本发明提供一种抑制伴随外部环境变化的变形的光信息记录媒体。该媒体包含透明树脂层、厚度比该透明树脂层大的树脂衬底、和配置在上述透明树脂层与上述树脂衬底之间的信息记录层，在上述树脂衬底外侧主面的仅仅一部分上形成有防止吸湿膜，并且上述防止吸湿膜的区域的大小是由上述防止吸湿膜与上述树脂衬底的外侧主面的面积比率来确定的。

Description

光信息记录媒体和其制造方法 及光信息记录再现方法
技术领域
本发明涉及一种光信息记录媒体和其制造方法、及使用该媒体的光信息记录再现方法。本发明尤其涉及一种抑制伴随外部环境变化而翘曲的光信息记录媒体。
背景技术
光信息记录媒体大致区别为再现专用型、追记型、可改写型。作为再现专用型，例举记录音乐信息的致密盘(CD)或记录图像信息的光盘(LD)。追记型用于文书文件或静止图像文件的保存，改写型用于个人计算机的数据文件的保存等。这些光盘具有在厚度为1.2mm的透明树脂衬底(基板)上形成信息层，并由涂层来保护该层的结构，或在厚度为1.2mm的两块透明树脂衬底一方或双方上形成信息记录层，将这两块衬底贴合起来的结构。
可记录声音信息及动画信息的大容量数字通用盘(DVD)正在普及。为了高密度记录信息，激光的波长必须短，物镜的数值孔径(NA)必须大。但是，这些短波长化和高NA化使盘相对激光的照射方向的倾角的允许范围窄。为了使倾角的允许值大，有效的做法是使激光入射侧的衬底变薄。例如，在现在的DVD标准下，激光波长为650nm，NA为0.60，衬底厚度为0.6mm。因为厚度为0.6mm的树脂衬底的机械强度小，所以在DVD中具有贴合两块衬底的结构，信息记录层夹在两块衬底中间。
由于开始地面波数字播放等，预测对具有25GB程度容量的光盘的需求进一步高。为了通过与CD或DVD基本相同大小的光盘来实现该程度的容量，提出激光波长为400nm左右，物镜的数值孔径为0.85左右。此时，若设激光入射侧的衬底厚度为0.1mm左右，则可确保与现在的DVD相同程度的倾角允许值。
若设一侧衬底的厚度为0.1mm，则为了维持与DVD的互换性，另一侧衬底的厚度必须为1.1mm。若扩大一对衬底的非对称性，则伴随外部环境变化、尤其是伴随湿度变化的吸水量差的光盘变形引起问题。一旦光盘变形产生的倾角变大，则会对信息的记录再现特性产生影响。
发明内容
本发明的目的在于提供一种抑制伴随外部环境变化的变形的光信息记录媒体。另外，本发明的其它目的在于提供一种该媒体的制造方法和在该媒体中记录再现光信息的方法。
本发明的光信息记录媒体包含透明树脂层、厚度比该透明树脂层大的树脂衬底、和配置在上述透明树脂层与上述树脂衬底之间的信息记录层，在上述树脂衬底外侧主面的仅仅一部分上形成有防止吸湿膜，并且上述防止吸湿膜的区域的大小是由上述防止吸湿膜与上述树脂衬底的外侧主面的面积比率来确定的。
本发明还提供上述光信息记录媒体的制造方法。在该制造方法中，在上述树脂衬底的一对主面一侧形成至少信息记录层，形成上述透明树脂层，使该信息记录层配置在上述树脂衬底与上述透明树脂层之间，配置防止损伤膜，使其覆盖上述透明树脂层的外侧主面，以配置该防止损伤膜的状态下，在上述树脂衬底的外侧主面上形成防止吸湿膜，形成上述防止吸湿膜后，去除上述防止损伤膜。
本发明还提供一种在上述光信息记录媒体上记录再现光信息的方法。在该方法中，通过以上述透明树脂层为入射侧向上述信息记录层照射波长小于450nm的激光，来记录再现信息。
附图说明
图1是表示本发明的光信息记录媒体一形态的剖面图。
图2A-图2G分别是表示本发明光信息记录媒体的制造工序一实例的剖面图。
图3是说明倾角α的测定方法的剖面图。
图4是表示本发明的光信息记录媒体另一形态的剖面图。
图5是表示本发明的光信息记录媒体再一形态的剖面图。
图6是表示本发明的光信息记录媒体又一形态的剖面图。
图7A-图7F分别是表示本发明的光信息记录媒体中的防止吸湿膜的形成图案的平面图。
图8是表示本发明的光信息记录媒体另一形态的剖面图。
图9是表示本发明的光信息记录媒体再一形态的剖面图。
图10是表示本发明的光信息记录媒体又一形态的剖面图。
图11A-图11D分别是表示本发明的光信息记录媒体中的防止吸湿膜的各种形态的剖面图。
图12是表示本发明的光信息记录媒体又一形态的剖面图。
图13是表示用于本发明的光信息记录媒体记录再现的装置一实例的图。
具体实施方式
在本发明的光信息记录媒体中，将树脂衬底上形成的防止吸湿膜作为第一防止吸湿膜，在透明树脂层外侧主面的至少一部分中形成第二防止吸湿膜。
若形成第一防止吸湿膜以覆盖树脂衬底外侧主面的整体，形成第二防止吸湿膜以覆盖透明树脂层外侧主面的整体的光信息记录媒体，可大幅度抑制媒体的吸湿。
透明树脂层用作使激光透过的透光层。因此，在透明树脂层上形成的第二防止吸湿层，最好相对照射在信息记录层上的激光具有90％以上的透过率。
防止吸湿膜也可是包含电介质材料的膜。电介质材料例如通过溅射法等真空成膜法容易成膜。电介质膜的膜厚即使为10nm也可达到防止吸湿的作用。因此，防止吸湿膜也可以是膜厚10nm以上、例如10nm-200nm的电介质膜。防止吸湿膜可以是包含从氧化物、氮化物及硫化物中选择的至少一种的膜，具体而言，最好以从SiO2、Al2O3、SiN、AlN和ZnS中选择的至少一种作为主要成分。这些化合物化学稳定、吸湿性低。另外，在本说明书中，所谓主要成分是指含有率超过50摩尔％的成分。
防止吸湿膜也可包含电介质材料以外的材料。例如，防止吸湿膜也可包含吸湿性比构成上述树脂衬底的材料低的树脂材料。作为吸湿性比作为构成树脂衬底的代表材料的聚碳酸酯低的材料，例如例举偏二氯乙烯。另外，可通过例如基于日本工业标准(JIS)Z-0208测定的值(单位g/m2·24hr)来评价吸湿性。
因此，如上述示例的材料，防止吸湿膜最好由基于由上述JIS测定值的吸湿性比构成树脂衬底的材料(典型为聚碳酸酯)低的材料构成。
透明树脂层最好包含从放射线固化性树脂和粘接性树脂中选择的至少一种。这里，所谓放射线固化性树脂是由紫外线、红外(热)线等各种电磁波固化的树脂，例如紫外线固化性树脂(UV固化树脂)。
透明树脂层最好由从放射线固化性树脂和粘接性树脂中选择的至少一种层构成。另外，在该层的外侧可以还包含树脂衬底。
树脂衬底的厚度是透明树脂层厚度的3倍以上，也可以是10倍以上，若适用本发明，则可抑制媒体变形。若透明树脂层薄，则容易确保倾角的允许值。因此，透明树脂层的厚度可以为0.3mm以下。另外，若考虑现有的批量生产技术或必要的强度，则透明树脂层可以2微米以上，最好是30微米以上。考虑到与现有媒体的互换性，树脂衬底的厚度与透明树脂层的厚度合计为1.2mm，若考虑公差，则应定为1.2mm±0.1mm。因此，透明树脂层的厚度为0.3mm以下时，树脂衬底的厚度为0.9mm以上。
如后所述，有时在树脂衬底的内侧主面上形成激光引导沟(槽)。此时，严密地讲，树脂衬底的厚度应为从外侧主面到内侧主面的脊表面(槽之间)的距离，透明树脂层的厚度应是从该脊表面到透明树脂层的外侧主面的距离。
既可在树脂衬底外侧整面中形成防止吸湿膜，也可在外侧主面的一部分中以规定图案形成防止吸湿膜。作为图案，例如例举出散点形、网格形或轮带形。在媒体为圆盘形的情况下，适用轮带形(环形；圆环形)的图案。因为可均匀圆周方向的媒体吸湿性。
对应于树脂衬底和透明树脂层的厚度或材料可适当确定形成防止吸湿膜的区域比率，通常，可在树脂衬底外侧主面的面积的35％-85％的区域、尤其是50-70％的区域内形成防止吸湿膜。该比率是在透明树脂层上不设置防止吸湿膜、而仅在树脂衬底的外侧主面上形成防止吸湿膜的情况下适用的范围。
透明树脂层也可包含作为最外层的保护层。若配置保护层，则可防止损伤透明树脂层的表面。
在树脂衬底的表面中，在防止吸湿膜的更外侧，最好配置由与透明树脂层相同材料构成的平衡层。若配置吸湿性实质等于透明树脂层的层，则可消除媒体变形的原因。
本发明也可适用于包含两个以上信息记录层的媒体。例如，也可以是还包含将上述信息记录层作为第一信息记录层、配置在第一信息记录层与透明树脂层之间的第二信息记录层，和配置在第一信息记录层和第二信息记录层之间的分离层的光信息记录媒体。
下面，参照附图来说明本发明的实施例。
在图1所示的光盘中，在圆盘形树脂衬底131的内侧主面中形成引导沟103。在该主面中形成记录层104，并配置透明树脂层(透光层)132。在树脂衬底131的外侧主面、即与透明树脂层132相对侧的主面中形成轮带形(环形)的防止吸湿膜151。用图示的内径141及外径142表示该轮带形区域。
在记录层104中包含例如由于照射激光而变化为不同光学状态的一层。记录层104还可以是适当配置保护层、反射层、干涉层等的多层膜。在光盘中，形成引导沟103等的衬底101的表层和记录层104也用作信息记录层105。在仅由坑等表面形状来记录信息的情况下，也可简单形成反射层来取代记录层104。此时，将反射层与衬底的表层作为信息记录层105。
在该光盘中，信息记录层105偏离盘的剖面中心，从外部环境提供给配置在两面上的树脂材料的水分量不同。设置在树脂衬底131外侧主面上的防止吸湿膜151缓和该不同引起的媒体变形。
参照图2A-图2G来说明该光盘制造方法的一实例。例如使用由注射模型成形形成的聚碳酸酯衬底来作为图2A所示的第一衬底101。将该衬底形成为具有中心孔102的圆盘形。聚碳酸酯是CD、DVD等光盘中通用的材料，廉价地适用于注射模型成形。另外，也可使用丙烯酸类列树脂、聚烯烃类树脂等来代替该材料。第一衬底101因为是不透过激光的衬底，所以使用没有透光性的材料来形成也无妨。在该衬底101上，由溅射法等形成记录层104。
在图2B所示第二衬底111也成形为具有中心孔112的圆盘形。可从由例如铸造法制作的片中切断成形该衬底。对用于该衬底的材料也不特别限制，使用聚碳酸酯、丙烯酸类树脂、降冰片烯类树脂即可。第二衬底111比第一衬底101薄地成形。
如图2C所示，在第二衬底111中涂布UV固化树脂121。该树脂121例如可使用喷嘴191在中心孔121附近涂布成轮带形。接着，如图2D所示，重合第二衬底111和第一衬底101，使两个衬底的中心一致，并且，使形成信息记录层105的面和涂布树脂121的面相对而重合。另外，也可将UV固化树脂涂布在第一衬底101的主面上而不是第二衬底111的主面上。
接着，如图2E所示，以中心孔102、112为轴旋转重合的两个衬底，由离心力将树脂121扩散到衬底之间，多余的树脂121可作为液滴被甩落。该旋转最好以1000-10000rpm程度的高速进行。若使用该涂布方法，则可均匀化衬底间的树脂121的厚度。另外，如图2F所示，为了固化树脂，照射紫外线123，通过固化的树脂膜124，一体化衬底101、111。该树脂膜124成为部分透过树脂层132。最后，一旦在第一衬底101的外侧主面上形成防止吸湿膜151，则得到图2G所示的光盘。
在该光盘中，通过第二衬底111和树脂124来构成透明树脂层。但是，不限于此，透明树脂层例如也可由第二衬底111和用于将该衬底贴合在第一衬底101上的粘接性材料(例如感压性粘接片)构成。仅由UV固化树脂等放射线固化性树脂来构成透明树脂层也无妨。
为了验证防止吸湿膜的效果，通过图2A-图2G所示方法制作光盘。注射模型成形聚碳酸酯来得到第一衬底101。第一衬底101是在表面形成引导沟的厚度约为1.1mm、直径约为120mm，中心孔径约为15mm的盘。
从第一衬底101侧依次成膜AgPdCu膜(80nm)、AlCr膜(10hm)、ZnS-SiO2膜(22nm)、GeSiN膜(5nm)、GeSbTe膜(10nm)、GeSiN膜(5nm)、ZnS-SiO2膜(55nm)来作为记录层104。这里，括号内为各膜的膜厚。GeSbTe膜为通过照射激光而在结晶状态和非结晶状态之间可逆变化的相变化型记录膜。ZnS--SiO2膜是保护膜，AgPdCu膜是反射膜。GeSiN膜和AgPdCu膜防止在邻接这些膜的膜之间扩散的界面膜。记录层104在外径为118mm的轮带形区域中形成。
切断由铸造法得到的聚碳酸酯片来得到第二衬底111。第二衬底111，厚度约为90微米、直径约为119.5mm，中心孔径约为22mm。以8000rpm旋转涂布在第二衬底上的UV固化树脂121约10秒钟，从第二衬底侧照射紫外线来形成树脂膜124。该树脂膜124的膜厚约为10微米。
在第一衬底101的外侧主面上，通过溅射法来成膜膜厚为20nm的ZnS--SiO2膜(摩尔比：ZnS∶SiO2＝80∶20)作为防止吸湿膜151。如图1所示，调整来形成防止吸湿膜151，分别使其外径142与形成信息记录层105的区域外径基本一致，其内径141为膜面积预定的值。外径142约为119mm。为了比较，除不形成防止吸湿膜，也与上述一样准备制作的光盘。
对于如此得到的光盘，在气温为30℃、湿度为90％的湿润气氛中放置一周以上后，取出放入气温为25度、湿度为50％的干燥气氛中。之后，从干燥气氛中取出后放置一天，测定盘的翘曲。通过测定各光盘的倾角α来评价翘曲。如图3所示，倾角α是以树脂衬底131为上方地放置盘，从垂直下方向照射激光200，入射的激光200与反射的激光201所成的角度，在向盘的外侧反射激光的情况下(图3)，表示为正值。向距光盘的中心58mm的位置照射激光。结果如表1所示。
(表1)
  内径(mm)   防止吸湿膜内径/外径(％)   膜面积比率(％) 倾角α(最大值)-方向(度) +方向(度)
  3550658095-   2942546779-   91837156370 0.40.30.20.100  0000.10.30.8
*内径/外径为膜形成区域的内径对媒体外径的比例
*膜面积比率为膜形成区域占衬底主面的比例
*倾角α为测定期间(一天)中观测的最大值
如表1所示，防止吸湿膜相对第一衬底主面的面积比率若为约35％-约85％(内径/外径约40％-约80％)，则倾角为0.3度以下。若该面积比率为约50％-约70％(内径/外径约50％-约70％)，则可将倾角抑制到为0.2度以下。
另外，作为防止吸湿膜，除了代替ZnS--SiO2膜而形成SiN膜(膜厚20nm)外，与上述一样制作光盘。对这些光盘也测定倾角α，得到与表1一样的结果。但是，进行反复从湿润气氛转移到干燥气氛的试验，ZnS--SiO2膜逐渐恶化，在反复移动5次后的倾角α的测定中，ZnS--SiO2膜形成的效果基本消失。相反，在以SiN膜作为防止吸湿膜的情况下，即使反复上述转移，该效果中也无变化，即使反复转移10次后，也可观察到与表1基本一样的结果。
另外，制作以AlN膜代替SiN膜作为防止吸湿膜的光盘。在该情况下，与SiN膜一样，在反复10次气氛移动后，观察实质无变化的防止吸湿特性。因此，作为防止吸湿膜，氮化物较适合。
在上述各光盘中，树脂衬底的厚度相对透明树脂层的厚度比为10以上。若将厚度差扩大到该程度，则伴随来自双方外侧主面的水分吸收或排放的盘变形变显著。但是，若形成防止吸湿膜，则水分向树脂衬底的吸收速度下降，结果，减少树脂衬底的吸水量。另外，若形成防止吸湿膜，则可限制树脂衬底的主面中伴随水分排放产生收缩的区域。从而，可实现透明树脂层的收缩与树脂衬底的收缩的平衡。防止吸湿膜用作在湿润气氛下按其名称限制水分的吸湿、在干燥气氛下限制水分排放的膜。
在形成以SiO2为主要成分的膜、或以Al2O3为主要成分的膜作为防止吸湿膜的情况下，与使用ZnS--SiO2膜的情况一样，可抑制媒体的变化。防止吸湿膜不限于上述电介质无机材料，例如也可使用偏二氯乙烯等吸湿性比聚碳酸酯低的树脂材料。
理论上，可通过变化厚度而不是面积来调整防止吸湿膜的吸湿特性。但是，现实中，对nm级的厚度控制相当困难。尤其是在批量生产工序中，在厚度上容易产生微妙的各批间的差异。因此，最好如上所述，将防止吸湿膜形成为规定的图案，以适当抑制伴随透明树脂层和树脂衬底的膨胀或干燥的变形。例如，若使用同一形状的掩模来进行溅射，则可再现性好地控制形成防止吸湿膜的区域大小。
尤其是在使用圆盘形衬底的情况下，若布图为轮带形(环形)，则可抑制圆周方向上的吸湿特性的局部变动。此时，若从衬底外周使轮带形图案外周过于后退，则外周附近的局部变形成为问题。轮带形图案的外径最好为树脂衬底外径的90％以上，特别是大于形成信号记录层的区域的外径。
在树脂衬底131的外侧主面上形成防止吸湿膜151时，有时通过操作等会损伤透明树脂层132的外侧主面。为了防止该情况发生，如图4所示，事先形成防止损伤膜161，覆盖透明树脂层132的外侧主面。在防止吸湿膜形成结束后去除防止损伤膜161。在上述制造工序中，使用丙烯酸类粘接剂将厚度约为60微米的聚乙烯膜贴附在透明树脂层的外侧来作为防止损伤膜161，但只要能达到防止透明树脂层表面损伤的目的，不特别限制材料、膜厚、贴附方法。例如，也可简单利用静电来进行防止损伤膜161的暂时贴附。
在与第一衬底101贴合前也可在第二衬底111的一侧主面上事先形成损伤防止膜161。此时，可重合成为第二衬底的片形材料和成为防止损伤膜的片形材料(例如聚乙烯膜)，使与第二衬底的形状一致进行冲切。
在透明树脂层132的表面硬度不太够或该表面的摩擦系数大时，如图5所示，也可在透明树脂层132的最外侧形成保护膜162。与防止损伤膜不同，将保护膜162作为透明树脂层132的一部分来形成。在制造工序中不去除。例如可通过旋涂法涂布UV固化性硬膜涂布剂，照射紫外线使之固化来形成保护膜。
也可并用防止损伤膜和保护膜。此时，在形成保护膜162之前，至少在形成防止吸湿膜151期间，可配置防止损伤膜161。最好在形成防止损伤膜161、形成防止吸湿膜151、去除防止损伤膜161之后形成保护膜162。
上述光盘为可记录型，但本发明也可适用于追记型或再现专用型光盘。例如在再现专用型光盘中，在第一衬底101的内侧主面中形成信息，作为具有规定形状凹凸的坑，代替记录层104，形成反射层，但此外与上述一样制作。本发明也可适用于具有两个以上信息记录层105的光盘。例如图6所示，在树脂衬底231和透明树脂层232(片形部件和UV固化树脂)之间，通过分离层233来配置两个信息记录层205、215，可提高信息记录的面密度。
上述光盘为相变化型光盘，但本发明也可适用于磁光盘等使用其它记录方式的媒体。另外，衬底不必是圆盘形，也可适用于光卡等媒体中。
另外，如图7A所示，除防止吸湿膜301的图案为散点形(点形)外，与上述一样制作光盘。在该图案下，在树脂衬底131的主面整体中均匀配置同一形状的点。使用膜厚为20nm的ZnS-SiO2膜(摩尔比：ZnS∶SiO2＝80∶20)来作为防止吸湿膜301。制作变更点的大小来将防止吸湿膜301对树脂衬底131外侧主面的面积比率调整到规定值的各种光盘，将这些光盘放置在湿润气氛中后移到干燥气氛中，测定倾角α。气氛气体、放置时间、测定方法与上述一样。结果如表2所示。
(表2)
  防止吸湿膜膜面积比率(％) 倾角α(最大值)-方向(度) +方向(度)
  9080706050400 0.40.30.20.1000   0000.10.20.30.8
*膜面积比率为膜形成区域占衬底主面的比例
*倾角α为测定期间(一天)中观测的最大值
在防止吸湿膜的面积比率为60％(点的大小：1cm2)的情况下，倾角α最小。虽然图案不同，但倾角α变为最小的值与表1基本一样。
不限制在树脂衬底131的主面中局部形成防止吸湿膜时的图案。也可如图7B所示，由网孔图案来形成防止吸湿膜302，也可如图7C所示，由沿径向排列扩散成放射形的散点形图案来形成防止吸湿膜303，也可如图7D所示，由随机配置的散点形图案形成防止吸湿膜304，也可如图7E所示，由从圆盘中心扩散成放射形的矩形图案来形成防止吸湿膜305。若仅在轮带形区域中形成图7A的图案，则变为图7F所示的防止吸湿膜306。
如图8所示，除也在透明树脂膜132的外侧主面中形成防止吸湿膜152(第二防止吸湿膜)外，与上述一样制作光盘。使用膜厚为20nm的ZnS--SiO2膜(摩尔比：ZnS∶SiO2＝80∶20)来作为树脂衬底131上的防止吸湿膜153(第一防止吸湿膜)。另一方面，使用膜厚为10nm的ZnS--SiO2膜(摩尔比：ZnS∶SiO2＝80∶20)来作为透明树脂层132上的防止吸湿膜152。该膜相对波长为400nm的激光的透过率为90％以上。在沿径向距盘中心60mm-119mm的轮带形区域中形成这些防止吸湿膜152、153。将该光盘放置在多湿气氛中后转移到干燥气氛中，测定倾角α。气氛气、放置时间、测定方法与上述一样。结果，倾角α在±0.05度以下。
在透明树脂层132上形成第二防止吸湿膜152时，其膜厚最好形成得薄，以使透过透明树脂层的激光透过率为90％以上。另一方面，若膜太薄则不能得到充分的防止吸湿特性。
第二防止吸湿膜152与第一防止吸湿膜不同，若由散点形、网孔形等细的图案形成，则对激光的透过特性产生局部影响。因此，最好以轮带形图案形成第二防止吸湿膜152或在透明树脂层的外侧主面的整个面上形成第二防止吸湿膜152。在第二防止吸湿膜152中也可使用与第一防止吸湿膜不同的材料。
若第二防止吸湿膜152的硬度低或摩擦系数大，则表面的损伤会对记录、再现特生产生影响。此时，如图9所示，在防止吸湿膜152上形成保护膜163。这里，只要也可通过旋涂法来涂布UV固化性硬涂层剂，照射紫外线后固化保护膜163即可。另外，保护膜163有时由于材料难以通过旋涂法在防止吸湿膜152上涂布。此时，雾化上述硬涂层剂后吹风，使光盘通过雾化该材料的气氛气中。
如图10所示，即使覆盖光盘的整体表面来形成防止吸湿膜155也无妨。该防止吸湿膜155不仅可抑制来自主面、而且可抑制来自端面的水分的吸收和排放。通过将光盘浸渍在液状的防止吸湿膜材料中或通过吹风雾化了的相同材料，可形成防止吸湿膜155。
防止吸湿膜也可不将同一材料成膜为均匀厚度来形成。例如图11A所示，距离盘中心越远厚度越厚地形成防止吸湿膜401。通过控制旋涂法的旋转速度可成膜这种膜。
防止吸湿膜由于材料不同，膜应力和硬度不同。因此，也可例如图11B所示，对应于距盘中心的距离来设置多个轮带形区域，在每个这些区域中设定防止吸湿膜402a、402b、402c的适当膜厚，也可如图11C所示，在每个轮带形区域中使用适当材料，形成防止吸湿膜403a、403b、403c。也可如图11D所示，局部层叠多个膜406a、406b来作为防止吸湿膜。
另外，如图12所示，在树脂衬底131上形成的防止吸湿膜502上也可形成由与透明树脂层132相同材料构成的平衡层501。在该光盘中，从露出外侧的透明树脂层132和平衡层501的外侧主面吸收和排放水分。平衡层501最好形成得比树脂衬底131薄，最好为实质上与透明树脂层132相同的厚度。若厚度相同，则基本上可完全排除湿度的影响，也可基本消除倾角α的变动。
在上述说明的光盘中，使用现用的装置，可记录和/或再现光信息。图13示出该装置结构的一实例。光盘230由通过电路基板240连接到电源210的马达250以规定速度旋转。从光拾取器220经由物镜222等光学系统照射从激光光源221照射的光辉。本发明的媒体适用于激光为450nm以下、例如400nm左右、物镜的数值孔径为0.7以上、例如0.85左右的记录再现(再生)。

Claims (23)

1.一种光信息记录媒体，包含透明树脂层、厚度比该透明树脂层大的树脂衬底、和配置在上述透明树脂层与上述树脂衬底之间的信息记录层，其特征在于：在上述树脂衬底外侧主面的仅仅一部分上形成有防止吸湿膜，并且上述防止吸湿膜的区域的大小是由上述防止吸湿膜与上述树脂衬底的外侧主面的面积比率来确定的。
2.根据权利要求1所述的光信息记录媒体，其特征在于：以上述防止吸湿膜作为第一防止吸湿膜，在上述透明树脂层的外侧主面的至少一部分中形成第二防止吸湿膜。
3.根据权利要求2所述的光信息记录媒体，其特征在于：覆盖上述透明树脂层的外侧主面整体地形成上述第二防止吸湿膜。
4.根据权利要求2所述的光信息记录媒体，其特征在于：上述第二防止吸湿膜对照射在上述信息记录层上的激光具有90％以上的透过率。
5.根据权利要求1所述的光信息记录媒体，其特征在于：上述防止吸湿膜包含电介质材料。
6.根据权利要求5所述的光信息记录媒体，其特征在于：上述防止吸湿膜包含从氧化物、氮化物及硫化物中选择的至少一种。
7.根据权利要求6所述的光信息记录媒体，其特征在于：上述防止吸湿膜以从SiO2、Al2O3、SiN、AlN和ZnS中选择的至少一种作为主要成分。
8.根据权利要求1所述的光信息记录媒体，其特征在于：上述防止吸湿膜包含吸湿性比构成上述树脂衬底的材料低的树脂材料。
9.根据权利要求1所述的光信息记录媒体，其特征在于：上述透明树脂层包含从放射线固化性树脂和粘接性树脂中选择的至少一种。
10.根据权利要求9所述的光信息记录媒体，其特征在于：上述透明树脂层在所包含的放射线固化性树脂和/或粘接性树脂的外侧还包含树脂衬底。
11.根据权利要求1所述的光信息记录媒体，其特征在于：上述树脂衬底的厚度是上述透明树脂层厚度的三倍以上。
12.根据权利要求1所述的光信息记录媒体，其特征在于：在上述外侧主面的一部分中以规定图案形成上述防止吸湿膜。
13.根据权利要求12所述的光信息记录媒体，其特征在于：上述规定图案为散点形、网格形或轮带形。
14.根据权利要求13所述的光信息记录媒体，其特征在于：上述媒体为圆盘形，上述规定图案为轮带形。
15.根据权利要求1所述的光信息记录媒体，其特征在于：在上述外侧主面面积的35％以上85％以下的区域内形成上述防止吸湿膜。
16.根据权利要求1所述的光信息记录媒体，其特征在于：上述透明树脂层包含作为最外层的保护层。
17.根据权利要求1所述的光信息记录媒体，其特征在于：在上述防止吸湿膜的更外侧形成由与上述透明树脂层相同材料构成的平衡层。
18.根据权利要求1所述的光信息记录媒体，其特征在于：还包含将上述信息记录层作为第一信息记录层，配置在上述第一信息记录层与上述透明树脂层之间的第二信息记录层，和配置在上述第一信息记录层和上述第二信息记录层之间的分离层。
19.根据权利要求1所述的光信息记录媒体，其特征在于：上述面积比率是根据上述树脂衬底和上述透明树脂层的厚度和材料来确定的。
20.根据权利要求1所述的光信息记录媒体，其特征在于：在上述树脂衬底的外侧主面上还形成有至少一个防止吸湿膜。
21.根据权利要求20所述的光信息记录媒体，其特征在于：上述至少一个防止吸湿膜直接连接在上述树脂衬底的外侧主面上，并且覆盖上述防止吸湿膜。
22.一种权利要求1所述光信息记录媒体的制造方法，其特征在于：包含以下工序：在上述树脂衬底的一对主面一侧形成至少上述信息记录层；形成上述透明树脂层，以在上述树脂衬底与上述透明树脂层之间配置该信息记录层；配置防止损伤膜，以覆盖上述透明树脂层的外侧主面；在配置该防止损伤膜的状态下，在上述树脂衬底的外侧主面上形成防止吸湿膜；形成上述防止吸湿膜后，去除上述防止损伤膜。
23.一种在权利要求1所述的光信息记录媒体上记录再现光信息的方法，其特征在于：通过以上述透明树脂层为入射侧向上述信息记录层照射波长450nm以下的激光，来记录再现上述光信息。
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