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CN101138035A - 光学记录介质 - Google Patents

光学记录介质 Download PDF

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Publication number
CN101138035A
CN101138035A CNA2006800080298A CN200680008029A CN101138035A CN 101138035 A CN101138035 A CN 101138035A CN A2006800080298 A CNA2006800080298 A CN A2006800080298A CN 200680008029 A CN200680008029 A CN 200680008029A CN 101138035 A CN101138035 A CN 101138035A
Authority
CN
China
Prior art keywords
layer
record medium
optical record
recording layer
information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2006800080298A
Other languages
English (en)
Inventor
中村有希
八代彻
见上竜雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Publication of CN101138035A publication Critical patent/CN101138035A/zh
Pending legal-status Critical Current

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
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Abstract

本发明的目的是提供一种光学记录介质，它包括基底、第一信息层和第二信息层，第一信息层和第二信息层通过层状结构中的中间层布置在基底上；通过来自第一信息层侧的激光束照射，在两层信息层中的每一层上进行记录和再现；第二信息层至少具有依次形成的反射层、介电层和第二染料记录层；并且介电层由选自与形成反射层的金属元素和半金属元素不相同的任何一种元素的氧化物、氮化物、硫化物、碳化物或其混合物中的任何一种材料形成。

Description

光学记录介质
技术领域
本发明涉及可记录的光学记录介质，可以通过用光束照射记录层诱导记录层上的透射率、反射率等发生光学变化，在该光学记录介质上记录并再现信息，并且本发明尤其适用于两层DVD(数字视频光盘或数字通用光盘)。
背景技术
近来，除了光学记录介质如只读DVD-ROM(数字通用光盘-只读存储器)之外，可记录的DVD如DVD+RW、DVD+R、DVD-R、DVD-RW和DVD-RAM也已经投入实际使用。这些DVD+R和DVD+RW等定位为常规的可记录CD-R和CD-RW(可重写压缩光盘)的延伸技术，并且设计成给DVD条件下的使用带来与CD条件中一致的记录密度(磁道间距和信号的标记长度(mark length))和基底厚度。
例如，DVD+R，像CD-R的情况中那样，应用这样一种结构：其中在基底上通过使用菁染料和/或偶氮金属螯合物染料进行旋涂(spin-coating)形成光学记录层，然后在光学记录层上形成金属反射层，以便形成用于记录信息的基底，并且与用于记录信息的基底类似形成的另外一个基底通过粘合材料粘合到用于记录信息的基底。在这种情况中，对于光学记录层，一般使用染料基材料。CD-R的一个特点是：CD-R具有65％的高反射率，这满足CD标准。这是因为为了在上述层状结构的情况下获得高反射率，光学吸收层在记录光束和再现光束的波长下必须满足特定的折射率，并且染料的光学吸收性能适合于这种条件。这同样适用于DVD。
同时，为了增加只读DVD的存储容量，已经提出了具有两层信息层的DVD。图1是显示具有这种两层信息层的DVD的层状结构的横截视图。在图1中，第一基底21和第二基底22通过由可以紫外线固化的树脂形成的透明中间层25结合在一起。在第一基底21的内表面上，形成作为第一信息层的半透明层23，并且在第二基底22的内表面上，形成作为第二信息层的反射层24。半透明层由介电层或薄的金属层形成，并且反射层24由金属层形成。半透明层23具有在其上形成的凹凸状的记录标记，由此通过再现激光束的反射和干扰作用读出记录信号。由于只读DVD从两层信息层中读出记录信号，因此可以获得至多约8.5GB的存储容量。第一基底21和第二基底22分别具有0.6mm的厚度，并且透明中间层25具有约50μm的厚度。形成第一信息层，使其具有约30％的反射率。用于照射以便在第二信息层上再现信息的激光束以大约整个光量的30％的量被反射到第一信息层，衰减，然后反射到第二信息层，进一步再次在第一信息层衰减，然后离开该光盘。用于再现的激光束的焦点集中在第一信息层或第二信息层上，以便检测反射光束，这种方法能够再现每一信息层上记录的信号。人们注意到：用于记录和再现DVD上的信息的激光束的波长大约为650nm。
上述提到的可记录的DVD，即DVD+R、DVD-R、DVD-RW和DVD+RW中，只存在具有单一信息层的光盘，在该信息层上可以从其单面读出信息，而为了在这些光学记录介质中获得更大的存储容量，必须制造能从其两面再现信息的光盘。相反地，单面两层记录并再现类型的光学记录介质中，当记录激光束的焦点通过光学拾取器(pick-up)照射到并集中在最内信息层或第二信息层上以便记录信号时，不能获得足以在第二信息层上记录信息的足够的光学吸收和光学反射率，因为第一信息层已经使激光束衰减。
例如，专利文献1提出一种光学记录介质，该光学记录介质配置成在记录时能从光学记录介质的单面在由有机染料制造的两层信息层上记录信息，并且在再现时能从光学记录介质的单面在两层信息层上读出所记录的信息。然而，该发明仍然只具有以下的层状结构，其中从基底表面进行光束照射的常规记录结构和从记录层表面进行光束照射的记录结构的两种基底结合在一起，并且这不能解决上述与第二信息层的光学吸收和反射率有关的问题。
此外，专利文献2描述了一种具有金属反射层、含有染料的记录层和保护层的层状结构。专利文献2描述了SiO和SiO2可以用于有机保护层的材料，然而，没有实施该发明的具体的制备条件和必需的光学性质。
专利文献1日本专利申请特许公开(JP-A)No.11-066622
专利文献2日本专利申请特许公开(JP-A)No.10-340483
发明内容
因此，本发明的一个目的是提供一种光学记录介质，它具有第一信息层和第二信息层，并且它不仅能从第一信息层而且能从由激光束照射侧看布置在最内侧的第二信息层中获得合适的记录信号性能，并且能够在光盘的单面记录并且再现信息。
在具有通过旋涂方法制备的染料基记录层的典型的光学记录介质中，在基底的凹部分上形成的染料层的厚度比在基底的凸部分上形成的染料层的厚度厚，并且在一个凹部分—所述各凹部分均为记录磁道—上记录信息时，能通凸部分的绝热作用防止凹坑(pit)向相邻磁道扩散。然而，像本发明的光学记录介质那样，当光学记录介质包括在第二基底的表面上形成的波动式(wobble)凸部分(根据需要还包括地址信息)，并且在第二基底上形成的第二信息层至少依次具有反射层、介电层、第二染料记录层和保护层，并且当在作为记录磁道的第二基底的凸部分上记录信息时，为了获得足够的信号振幅和足够的反射率，必须使染料记录层的平均厚度比一般在凹部分上记录信息的情况更厚。此外，当在连续磁道上记录信息时，记录激光束照射产生的热量和在染料分解时产生的热量传至相邻磁道，这导致抖动值(jitter value)增加并且波动信号的质量降低的现象，因为在凸部分上形成的染料记录层的厚度基本上等于或稍微低于在磁道之间形成的凹部分上形成的染料记录层的厚度。
<1>一种光学记录介质，从激光束照射侧看，它具有依次形成的第一基底、第一信息层、中间层和第二信息层，其中从激光束照射侧看，第二信息层具有依次形成的第二染料记录层、介电层和反射层；并且该介电层包括选自与用于形成反射层的金属元素和半金属元素不相同的任何一种元素的氧化物、氮化物、硫化物、碳化物或其混合物中的任何一种材料。
<2>根据项<1>所述的光学记录介质，其中通过来自第一信息层侧的激光束照射，在第一信息层和第二信息层中每一个上进行记录和再现。
<3>根据项<1>到<2>中任何一项的光学记录介质，其中介电层的材料是一种复合电介质，该复合电介质包括50摩尔％到90摩尔％的选自ZnS、ZnO、TaS2和稀土硫化物中的一种或多种，以及具有高透明度且熔点或歧点(bifurcation point)中的任何一个为1,000℃或以上的耐热化合物。
<4>根据项<1到<3>中任何一项的光学记录介质，其中介电层具有1nm到70nm的厚度。
<5>根据项<1>到<4>中任何一项的光学记录介质，其中从激光束照射侧看，第一信息层具有依次形成的第一染料记录层和半透明反射层。
<6>根据项<1>到<5>中任何一项的光学记录介质，其中从激光束照射侧看，第二信息层具有依次形成的保护层、第二染料记录层、介电层和反射层。
<7>根据项<5>到<6>中任何一项的光学记录介质，其中第一染料记录层和第二染料记录层中每一层均包括选自四氮卟啉染料、菁染料、偶氮染料和方酸染料(squarylium dye)中的一种或多种。
<8>根据项<5到<7>中任何一项的光学记录介质，其中第二染料记录层的厚度为第一染料记录层的1.0倍到2.0倍。
<9>根据项<6>到<8>中任何一项的光学记录介质，其中保护层包括ZnS。
<10>根据项<9>的光学记录介质，其中保护层还包括透明的导电氧化物。
<11>根据项<10>的光学记录介质，其中透明的导电氧化物选自In2O3、ZnO、Ga2O3、SnO2、Nb2O5和InGaO3中的一种或多种。
<12>根据项<6到<11>中任何一项的光学记录介质，其中保护层具有10nm到300nm的厚度。
<13>根据项<1>到<12>中任何一项的光学记录介质，其中该反射层包括Ag和Ag合金中的任何一种，并且具有100nm到200nm的厚度。
附图说明
图1是示范性显示具有两层信息层的DVD结构的横截视图。
图2是示范性显示本发明的光学记录介质的层状结构的横截视图。
图3是示范性显示本发明的另一种光学记录介质的层状结构的横截视图。
具体实施方式
在本发明中，具有第一信息层和第二信息层的光学记录介质的特征在于：在反射层和染料记录层之间形成介电层，从激光束照射侧看，反射层和染料记录层均构成布置在最内侧的第二信息层，并且将染料记录层制备成薄的，由此降低相邻磁道之间引起的串扰(cross-talk event)，并因此增强记录性能。
在一般的DVD±R和两层光学记录介质中，关于布置在前侧的第一记录层，形成具有厚度为60nm到100nm的染料记录层，并且将其涂布在具有槽深为100nm到200nm的凹槽上，因此在通过激光束照射而记录信息的凹槽部分的染料的厚度相对厚，而其上没有记录信息的槽脊(land)部分的厚度是薄的，导致相邻凹槽部分之间的热干扰小。用于记录的激光功率越大，对相邻凹槽部分的热干扰越大，这导致信号质量即抖动性能恶化。因此，应当理解为：当记录速度增加时，需要更高的功率，并且它更容易受到热干扰的影响。
在用于本发明的层状结构中，为了形成从光学记录介质的激光束照射侧看布置在最内侧的第二染料记录层，有必要以与常规CD-R和DVD±R中相反的次序通过溅射在基底上形成反射层，在反射层上涂布染料记录层，并且通过溅射形成保护层。因此，在基底上交替排列的槽脊和凹槽之中，从用于记录和再现的拾取器的角度看，在前面的槽脊部分即基底的凸部分记录信息，因此热扩散对相邻的槽脊部分具有更大的影响，并且表示记录质量的抖动性能容易升高。因此，重要的是在反射层上形成介电层，如本发明那样，由此控制记录激光束的光路长，并且降低染料记录层的厚度，以及控制从染料记录层到金属反射层的散热(heat dissipation)，并且由于该结构，可以生产适用于更高记录速度的光学记录介质。
介电层的厚度优选为1nm到70nm，并且更优选为4nm到40nm。当介电层的厚度小于1nm时，仅仅导致可忽略的热性质和光学性质的差异，并且记录性能可能没有区别，而当厚度大于70nm时，它阻止记录层由于激光束照射而产生的热量向反射层逸出，并且因此记录标记过度变宽，导致降低的抖动性能。此外，在布置在最内侧的信息层中，难以具有15％或以上的反射率，并且难以用这样的光学记录介质打开(turned on)DVD再现播放器。
在下文中，将参考附图描述本发明的光学记录介质方面。
图2是示范性显示本发明的光学记录介质的层状结构的横截视图。该光学记录介质具有第一基底1、第一染料记录层2、半透明反射层3、中间层4、保护层5、第二染料记录层6、介电层7、反射层8和第二基底9。第一染料记录层2和半透明反射层3构成第一信息层100，而保护层5、第二染料记录层6、介电层7和反射层8构成第二信息层200。
图3是示范性显示本发明的光学记录介质的另一层状结构的横截视图。该光学记录介质具有第一基底1、第一染料记录层2、半透明反射层3、中间层4、保护层5、第二染料记录层6、介电层7、反射层8和第二基底9。附图标记100表示第一信息层，而附图标记200表示第二信息层。
对于第一信息层100，通过使第一信息层100具有类似于具有单一记录层的常规介质如DVD+R和DVD-R的层状结构，其中具有第一染料记录层和在其上形成的半透明反射层的第一基底被粘合到独自形成的第二基底上，然而除了独自形成的基底以外，在形成标记时引起第一染料记录层2的两个界面的多重干涉效应和第一基底1的变形，由此获得第一信息层所需的反射率和记录信号的调制度(对比度)。
对于第二信息层200，第二信息层所需的反射率和记录信号的调制度(对比度)通过第二基底9上的槽形和一种或多种染料的光学吸收性能而获得，并且通过在第二染料记录层6和由有机树脂等制成的中间层4之间布置由难以变形的材料制成的光学透明防护层5，可以防止一种或多种染料由于有机树脂的影响而洗脱，并且可以形成标记形状特征。
第一和第二基底的材料的优选实例包括聚碳酸酯树酯、丙烯酸类树脂、环氧树脂、聚苯乙烯树脂、丙烯腈-苯乙烯共聚物树脂、聚乙烯树脂、聚丙烯树脂、有机硅树脂、氟树脂、ABS树脂、聚氨酯树脂和透明玻璃。这些材料中，就光学性质和价格性能的优越性而言，优选使用聚碳酸酯树酯和丙烯酸类树脂。
在第一基底和第二基底这两个基底上，形成用于引导记录和再现光束的磁道间距为0.8μm或以下的凹槽，该凹槽没有必要以矩形或梯形的形状形成，可以形成具有不同折射率的类似于波导的凹槽，以便光学上形成凹槽。
可以根据所用的评估装置的拾取器的数值孔径(NA)改变第一和第二基底各自的厚度以获得色差，并且一般地，数值孔径(NA)为0.6到0.65时，第一和第二基底各自的厚度优选为0.6mm。
此外，在第一基底1和第二基底9上形成的每一凹槽形状不相同。在具有存储容量为4.7GB并且磁道间距为0.74μm的DVD+R或DVD-R的情况中，第一基底1优选具有槽深为1,000埃到2,000埃并且槽宽或底宽为0.2μm到0.3μm的槽形。当通过旋涂制备层时，凹槽具有被一种或多种染料填充的倾向，并且染料记录层和反射层的各界面由填充比和基底的凹槽形状确定，因此为了利用界面的反射，有关槽形的上述范围是合适的。
另一方面，第二基底9优选具有槽深为200埃到600埃并且槽宽为0.2μm到0.4μm的槽形。如图2所示，由于根据基底的槽形确定染料记录层和反射层的各界面形状，为了利用界面的反射，槽形的上述范围是适合使用的。
当第一基底1和第二基底9均分别具有比上述范围更深的槽深时，反射率容易降低。当第一基底1和第二基底9均分别具有比上述范围更浅的槽深，或槽宽偏离该槽宽范围时，记录过程中的磁道性能不稳定，并且要形成的记录标记的形状难以均匀，并且抖动值容易增加。
用于第一染料记录层2和第二记录层6的染料的实例包括菁染料、酞菁染料、偶氮金属螯合物染料和方酸染料。包括这些染料的第一和第二记录层能容易形成小的标记，并且与高密度记录兼容。
第一染料记录层2和第二记录层6各自的厚度优选为30nm到150nm。当厚度小于30nm时，难以获得足够的对比度，并且调幅容易降低。另一方面，当厚度大于150nm时，难以记录小的记录标记。
此外，在高密度记录中，如在最短标记长度为0.5μm或以下的记录中，第一染料记录层2和第二记录层6的厚度优选为50nm到100nm。当厚度小于50nm时，是不利的，因为反射率过度降低，并且厚度容易不均匀。另一方面，当厚度大于100nm时，热容量增加，导致记录灵敏度降低，并且由于导热不均匀性所导致的记录标记的扰动边缘，抖动值容易增加。
一般地，第一染料记录层2和第二记录层6由旋涂形成。已经进行过旋涂工艺的染料记录层基本上是均匀的，然后，由记录引起染料记录层的变形和光学空穴(optical hole)以及基底的变形，并且通过改变这些部分的反射率识别记录标记。一般地，记录前后之间的反射率之差大于5％。应该注意：当在其上形成有导向凹槽的基底上形成第一和第二染料记录层时，凹槽部分和凹槽间部分的染料厚度存在差异。
在本发明中，第二染料记录层6的厚度优选为第一染料记录层2的1.0倍到2.0倍。当这些记录层的厚度差偏离该范围时，难以用类似的记录策略或类似的记录激光发射脉冲模式在第一和第二染料记录层上均记录信息，因为使记录标记变宽的容易程度不同。
在下文中，将详细描述用于本发明各层光学记录介质的材料。
如DVD+R和CD-R那样，通过各自包括一种或多种染料的记录层的两个界面的多重干涉效应，将本发明的光学记录介质配置成获得高反射率，并且该染料记录层在记录和再现波长入处必须具有复折射率“n-ik”中折射率“n”相对大并且吸收系数“k”相对小的光学性质。该值“n”和“k”一般分别在n>2和0.02<k<0.2的范围内，并且优选地，该值“n”为2.2到2.8，并且该值“k”为0.03到0.07。当该值“k”小于0.03时，记录灵敏度降低，因为记录激光束的吸收少，而当该值“k”大于0.07时，反射率降低，并且在具有两层记录层的光学记录介质的情况中，难以充分增加从激光束照射侧看布置在最内侧处的记录层的反射率。这种光学性质可以通过利用染料层的光吸收带的长波长边缘的性能而获得。本发明的光学记录介质与波长为600nm到800nm的红光激光束兼容，并且优选的记录和再现波长入为650nm到670nm。当设置光学记录介质的构造时，首先可以从上述波长范围确定用于记录和再现的激光束的波长，然后可以选择各个层的每一材料和厚度，以便满足本发明的条件。
可以用于第一染料记录层2和第二染料记录层6的染料材料的实例包括四氮卟啉染料、菁染料、酞菁染料、吡喃_染料、硫代吡喃_染料、薁_(azulenium)染料、方酸染料、偶氮染料、甲_螯合物(formazanchelate)染料、金属如Ni和Cr配盐染料、萘醌染料、蒽醌染料、靛酚染料、靛苯胺染料、三苯基甲烷染料、三烯丙基甲烷染料、铵_染料、二亚铵_(diimmonium)染料和亚硝基化合物。在这些中，作为在层上具有光吸收光谱的最大吸收波长为580nm到620nm的并且能通过其在约650nm的DVD的激光束的波长下容易获得所需光学性质的染料化合物，考虑到通过溶剂涂布形成层以及光学性质易控程度，优选四氮卟啉染料、菁染料、偶氮染料和方酸染料。
此外，可以仅仅使用一种或多种染料制备染料记录层，然而根据需要，可以包括其它第三组分如粘合剂和稳定剂。
关于反射层8和半透明反射层3的材料，优选使用对激光束波长具有高反射率的材料，并且其实例包括金属和半金属如Au、Ag、Cu、Al、Ti、V、Cr、Ni、Nd、Mg、Pd、Zr、Pt、Ta、W、Si、Zn。在这些中，优选包括选自Au、Ag、Cu和Al中的任何一种元素作为主要成分和0.5质量％到10质量％的选自Au、Ag、Cu、Al、Ti、V、Cr、Ni、Nd、Mg、Pd、Zr、Pt、Ta、W、Si、Zn和In中的与上述四种元素不同的至少一种元素的合金。通过添加0.5质量％或以上的除了上述四种元素以外的至少一种元素，反射层8和半透明反射层3可以形成耐腐性优异的薄层，并且其晶粒被微粒化。然而，当除了上述四种元素以外的至少一种元素添加的量超过10质量％时，是不利的，因为反射率降低。
制备半透明反射层3，使其透射率为30％到 60％，并且反射率为15％到30％，以致于足量的激光束到达第二染料记录层6。半透明反射层3的厚度优选为5nm到30nm。
反射层8的厚度优选为100nm到200nm，并且更优选为130nm到200nm。优选形成厚的反射层，以增加布置在最内侧的第二信息层200的散热性能，然而当厚度大于200nm时，从生产费用方面看是不利的，因为需要花费长的时间形成层，并且材料成本增加。此外，层表面的微观平整度降低。
当第一染料记录层2和包括丙烯酸类树脂的透明中间层4通过具有厚度为30nm或以下的非常薄的半透明反射层形成层状结构时，必须防止染料和丙烯酸类树脂等渗进(sink)半透明反射层3，并且彼此溶解。在由晶粒尺寸相对大的材料制成的半透明反射层的情况中，如在由纯金属制成的薄层中，必须注意，因为薄层容易形成类似于岛状的不均匀形状，并且该树脂容易从颗粒边界处渗入。
必须在第二染料记录层6和中间层4之间形成保护层5，以便对染料记录层进行化学和物理保护。
用于保护层5的材料的实例包括氧化物如氧化硅、氧化铟、氧化锡、氧化锌、氧化镓、氧化铌、氧化铝、氧化镁和氧化钽；半金属或半导体材料如硅、锗、碳化硅、碳化钛和石墨；氟化物如氟化镁、氟化铝、氟化镧和氟化硒；硫化物如硫化锌、硫化镉和硫化锑；氮化物如氮化硅和氮化铝；硫族化物如ZnSe、GaSe和ZnTe；或上述材料的混合物。
尤其是，优选使用包括大量硫化锌、硫化镉、硫化锑和/或氧化硅的、均具有小的内应力的材料。进一步，为了优化折射率“n”和吸收系数“k”，可以使用这些材料的混合物。这些材料分别具有高的熔点，并且当在靶煅烧时混合的材料并不彼此反应时，该值“n”和“k”基本上等于其相应混合比率的加权平均值。
在这些材料中，当主要使用具有较小毒效和高溅射率并且便宜的硫化锌时，可以增加产率，并且降低生产成本。硫化锌的组成比例优选为60摩尔％到95摩尔％，并且当组成比例大于95摩尔％时，不能在第二染料记录层6上适当沉积薄层。为了控制折射率“n”，理想的是：确定硫化锌的组成比例为95摩尔％或以下，并且与具有与硫化锌的折射率不同的材料混合。当制备由混合物制成的薄层时，可以将多个靶同时进行溅射工艺，然而，这是不利的，因为生产装置昂贵，并且难以控制比例。因此，从产率角度看，有利的是：制备硫化锌和添加材料的混合靶，并且然后进行溅射工艺。
硫化锌的折射率“n”为约2.35，并且当使用硫化锌与SiO2的混合物，以便获得低于2.35的折射率时，可以生产具有稳定质量的保护层，因为可以使用用于市售CD-RW、DVD-RW和DVD+RW的靶。
进一步通过添加5摩尔％或以上的硅、碳化硅、氧化钛或锗，可以增加折射率“n”。当添加量小于5摩尔％时，增加折射率的效果变小到可忽略的程度。
尤其是，通过向保护层的靶材料添加透明的导电氧化物如氧化铟、氧化锌、氧化镓、氧化锡、氧化铌和InGaO3(ZnO)m(m是正整数)，能进行DC溅射，因为可以对靶赋予导电性。增加的溅射速率有助于减少生产步骤和降低生产装置的成本。为了能使用DC溅射，靶的电阻率必须是1Ωcm或以下，并且优选电阻率为0.1Ωcm或以下，可以增加产率，因为即使当施加高溅射功率时，也不出现电弧等问题。进一步优选电阻率为0.01Ωcm或以下，可以降低生产装置的成本，因为溅射电源不再需要电弧切割(arc-cut)装置，也不需要叠加脉冲的装置。然而，保护层5的应力增加，并且从第二染料记录层6和保护层5之间的界面出现剥落，并且因此确定透明导电氧化物的最大添加量为30摩尔％。
保护层5的厚度优选为10nm到300nm。当厚度小于10nm时，由于保护层的缺陷，中间层的材料渗进第二染料记录层6，导致染料变性。当厚度大于300nm时，保护层5的应力增加，因为在溅射过程中基底升高的温度过大，因此，容易引起基底的变形和保护层的剥落。进一步，当吸收系数“k”不为零时，染料记录层的反射率由于光吸收而降低。
当记录激光束的波长为600nm到700nm，并且保护层5的材料的折射率为1.9到2.4时，保护层的厚度优选为40nm到160nm，并且更优选为100nm到140nm。
基本上，该折射率“n”和该厚度“d”之间的乘积相类似的情况是允许的。即，当折射率设置为更小时，厚度必须比使用原折射率时的厚度更大。这是因为：反射率必须与其它层的反射率类似，并且光路长(2×n×d)的偏差表示相差，因此以非常薄的厚度形成保护层时，难以获得相差，即调幅。
对于要在反射层8上形成的介电层7的材料，介电层7由选自与用于形成反射层的金属元素和半金属元素不相同的任何一种元素的氧化物、氮化物、硫化物、碳化物或其混合物中的任何一种材料组成。
在这些材料中，优选使用复合电介质材料，该复合电介质材料包括50摩尔％到90摩尔％的选自ZnS、ZnO、TaS2和稀土硫化物中的一种或多种，并且包括具有高透明度且熔点或歧点为1,000℃或以上的耐热化合物。尤其优选，包括70摩尔％到90摩尔％的ZnS和ZnO或包括60摩尔％到90摩尔％的稀土硫化物如La、Ce、Nd和Y的复合电介质材料。
具有高透明度且熔点和歧点为1,000℃或以上的耐热化合物材料的实例包括Mg、Ca、Sr、Y、La、Ce、Ho、Er、Yb、Ti、Zr、Hf、V、Nb、Ta、Zn、Al、Si、Ge和Pb的氧化物、氮化物和碳化物。该氧化物、硫化物、氮化物和碳化物不一定具有化学计量的组成，并且可以控制其组成，以便控制折射率等，并且可以混合各上述材料以便使用。
根据本发明，可以通过在反射层和染料记录层之间形成介电层，提供具有两层信息层的光学记录介质，从激光束照射侧看，反射层和染料记录层均构成布置在最内侧的第二信息层，以便使染料记录层变薄，由此降低在相邻磁道之间导致的串扰，并且增加记录性能。
实施例
在下文中，将结合具体实施例和对比例进一步详细描述本发明，然而，本发明不局限于所公开的实施例。例如，在8X DVD记录线速度(线速度＝30.6米/秒)的记录和再现条件下评估所制备的光学记录介质，然而，当记录和再现条件进一步改变为更高的速度时，能够进行更高速度的记录和再现。
(实施例1到26和对比例1到2)
用涂布溶液旋涂厚度为0.57mm的聚碳酸酯基底，所述聚碳酸酯基底上形成有槽深为160nm，槽宽为0.35μm并且磁道间距为0.74μm的凹槽，所述涂布溶液中由以下结构式表示的方酸染料化合物溶于2,2,3，3-四氟丙醇，由此在聚碳酸酯基底上形成厚度为约40nm的第一染料记录层。
进一步，用包括0.5原子％In的Ag合金溅射第一染料记录层，在第一染料记录层上形成厚度为9nm的半透明反射层，然后获得其上形成有第一信息层的第一基底。
其次，在其上形成有槽深为34nm、槽宽为0.3μm并且磁道间距为0.74μm的凹槽且厚度为0.6mm的聚碳酸酯基底上，形成具有表1-A和1-B中所述厚度的Ag反射层，和具有表1-A和1-B中所述厚度且由表中所述材料形成的介电层。介电层用涂布溶液旋涂，该涂布溶液中由以下结构式表示的方酸染料化合物溶于2,2,3，3-四氟丙醇，由此在介电层上形成厚度为约70nm的第二染料记录层。
在第二染料记录层上，形成具有表1-A和1-B所述厚度的并且由表中所述材料形成的保护层，由此获得其上形成有第二信息层的第二基底。
接着，用作为树脂中间层的可紫外线固化的粘合剂(KARAYADDVD576M，由Nippon Kayaku Co.，Ltd.制造)将第一基底和第二基底结合在一起，使中间层的厚度为50μm，由此获得光学记录介质。
Figure A20068000802900151
使用由PULSTEC INDUSTRIAL CO.，LTD.制造的ODU-1000，在657nm的波长和0.65的透镜数值孔径(NA)下，以30.64m/s的线速度(8XDVD)在如此获得的光学记录介质的第二染料记录层上记录DVD(8-16)信号。然后，在3.83m/s的线速度下再现该信号，以便评估结果。表2-A和2-B显示评估结果。在表2-A和2-B中，“功率储备(power margin)”是对抖动值为9％或以下的下限抖动功率值P1，和上限抖动功率值P2，通过以下计算确定的数值。
(P2-P1)×2/(P2+P1)
在表2-A和2-B，“记录后的反射率”相当于“I14/I14H”，并且“I14/I14H”是由以下方程式表示的调制度。
I14/I14H＝(I14H-I14L)/I14H
表1-A
  下保护层的组成(摩尔％)   下保护层的厚度   上保护层的组成(摩尔％)   上保护层的折射率   上保护层的厚度   反射层的厚度
  实施例1   ZnS(80)SiO2(20)   150nm   SiO2   1.5   15nm   120nm
  实施例2   ZnS(80)SiO2(20)   150nm    Si3N4   2.0   15nm   120nm
  实施例3   ZnS(80)SiO2(20)   150nm   SiC   2.7   5nm   120nm
  实施例4   ZnS(80)SiO2(20)   150nm   ZnS   2.4   15nm   120nm
  实施例5   ZnS(80)SiO2(20)   150nm   TiO2   3.0   10nm   120nm
  实施例6   ZnS(80)SiO2(20)   150nm   SiO2(80)Ta2O5(20)   2.0   15nm   120nm
  实施例7   ZnS(80)SiO2(20)   150nm   Nb2O5(70)SiO2(30)   2.1   15nm   120nm
  实施例8   ZnS(80)SiO2(20)   150nm   TiC(70)TiO2(30)   2.4   5nm   120nm
  实施例9   ZnS(80)SiO2(20)   150nm   In2O3(90)SnO2(10)   2.0   15nm   120nm
  实施例10   ZnS(80)SiO2(20)   150nm   ZnS(70)ZnO(28)Ga2O3(2)   2.2   15nm   120nm
  实施例11   ZnS(80)SiO2(20)   150nm   SnO2(67)ZnO(25)In2O3(8)   2.1   15nm   120nm
  实施例12   ZnS(80)SiO2(20)   150nm   ZnS(70)SiC(30)   2.5   15nm   120nm
  实施例13   ZnS(80)SiO2(20)   150nm   ZnS(80)SiO2(20)   2.1   15nm   120nm
  实施例14   ZnS(80)SiO2(20)   150nm   ZnS(80)Si3N4(20)   2.2   15nm   120nm
  实施例15   ZnS(80)SiO2(20)   150nm   Si3N4(90)TiC(10)   2.3   10nm   120nm
表1-B
  下保护层的组成(摩尔％)   下保护层的厚度   上保护层的组成(摩尔％)   上保护层的折射率   上保护层的厚度   反射层的厚度
  实施例16   ZnS(80)SiO2(20)   150nm   SnO2(80)Ta2O5(20)   2.0   1nm   120nm
  实施例17   ZnS(80)SiO2(20)   150nm   SnO2(80)Ta2O5(20)   2.0   50nm   120nm
  实施例18   ZnS(80)SiO2(20)   150nm   SnO2(80)Ta2O5(20)   2.0   70nm   120nm
  实施例19   ZnS(80)SiO2(20)   150nm   SnO2(80)Ta2O5(20)   2.0   15nm   80nm
  实施例20   ZnS(80)SiO2(20)   150nm   SnO2(80)Ta2O5(20)   2.0   15nm   200nm
  实施例21   ZnS(80)SiO2(20)   150nm   ZnS(90)(InGaO3(ZnO)4)(10)   2.3   10nm   120nm
  实施例22   ZnS(70)ZnO(30)   150nm   SnO2(80)Ta2O5(20)   2.0   15nm   120nm
  实施例23   ZnS(70)ZnO(28)Ga2O3(2)   150nm   SnO2(80)Ta2O5(20)   2.0   15nm   120nm
  实施例24   ZnS(70)In2O3(27)SnO2(3)   150nm   SnO2(80)Ta2O5(20)   2.0   15nm   120nm
  实施例25   ZnS(70)Nb2O5(30)   150nm   SnO2(80)Ta2O5(20)   2.0   15nm   120nm
  实施例26   ZnS(90)(InGaO3(ZnO)4)(10)   150nm   SnO2(80)Ta2O5(20)   2.0   15nm   120nm
  对比例1   ZnS(70)ZnO(30)   150nm   120nm
  对比例2   ZnS(80)SiO2(20)   150nm   SnO2(80)Ta2O5(20)   2.0   75nm   120nm
表2-A
  最佳记录功率(mW)   本底抖动(Bottom Jitter)(％)   功率储备(％)   记录后的反射率(％) I14/I14H
  实施例1   38   7.2   20   19.0   0.75
  实施例2   40   7.5   25   19.5   0.75
  实施例3   43   8.0   17   19.0   0.80
  实施例4   41   7.8   18   18.0   0.70
  实施例5   39   7.9   20   18.5   0.78
  实施例6   39   7.5   19   19.2   0.77
  实施例7   40   7.5   18   19.5   0.77
  实施例8   42   7.9   18   18.0   0.77
  实施例9   39   8.0   19   19.7   0.74
  实施例10   40   7.8   22   16.0   0.75
  实施例11   39   7.3   25   19.5   0.70
  实施例12   38   7.6   20   20.0   0.72
  实施例13   40   8.0   20   19.0   0.72
  实施例14   39   8.0   18   19.5   0.75
  实施例15   42   7.8   18   20.0   0.68
表2-B
  最佳记录功率(mW)   本底抖动(％)   功率储备(％)   记录后的反射率(％) I14/I14H
  实施例16   44   8.2   12   17   0.6
  实施例17   45   8.4   10   21   0.64
  实施例18   47   8.5   10   21   0.62
  实施例19   38   7.9   10   18   0.75
  实施例20   42   7.7   12   20   0.68
  实施例21   42   7.8   20   20   0.70
  实施例22   40   7.5   22   19   0.74
  实施例23   40   7.6   22   19   0.75
  实施例24   40   7.8   20   19   0.75
  实施例25   40   7.5   22   19   0.76
  实施例26   40   7.6   21   19   0.75
  对比例1   45   8.7   3   17   0.57
  对比例2   50   8.9   2   20.5   0.60
从表2-A和2-B可以看出，实施例1到26的各光学记录介质均显示优异的记录性能，并且反射率为16％或以上。然而，在没有形成上保护层的情况下制成的对比例1的光学记录介质和上保护层的厚度超过70nm的对比例2的光学记录介质均没有低的抖动值，并且其功率储备非常小。
工业实用性
本发明光学记录介质尤其适用于具有两层信息层的两层可记录的DVD(数字视频光盘或数字通用光盘)。

Claims (13)

1.一种光学记录介质，从激光束照射侧看，它包括依下列顺序形成的：
第一基底、
第一信息层、
中间层和
第二信息层，
其中从激光束照射侧看，第二信息层包括依次形成的第二染料记录层、介电层和反射层；并且该介电层包括选自与用于形成反射层的金属元素和半金属元素不相同的任何一种元素的氧化物、氮化物、硫化物、碳化物或其混合物中的任何一种材料。
2.根据权利要求1所述的光学记录介质，其中通过来自第一信息层侧的激光束照射，在第一信息层和第二信息层中每一层上进行记录和再现。
3.根据权利要求1到2中任何一项的光学记录介质，其中介电层的材料是一种复合电介质，该复合电介质包括50摩尔％到90摩尔％的选自ZnS、ZnO、TaS2和稀土硫化物中的一种或多种，以及具有高透明度且熔点或歧点中的任何一个为1,000℃或以上的耐热化合物。
4.根据权利要求1到3中任何一项的光学记录介质，其中介电层具有1nm到70nm的厚度。
5.根据权利要求1到4中任何一项的光学记录介质，其中从激光束照射侧看，第一信息层包括依次形成的第一染料记录层和半透明反射层。
6.根据权利要求1到5中任何一项的光学记录介质，其中从激光束照射侧看，第二信息层包括依次形成的保护层、第二染料记录层、介电层和反射层。
7.根据权利要求5到6中任何一项的光学记录介质，其中第一染料记录层和第二染料记录层中每一层均包括选自四氮卟啉染料、菁染料、偶氮染料和方酸染料中的一种或多种。
8.根据权利要求5到7中任何一项的光学记录介质，其中第二染料记录层的厚度为第一染料记录层的1.0倍到2.0倍。
9.根据权利要求6到8中任何一项的光学记录介质，其中保护层包括ZnS。
10.根据权利要求9中的光学记录介质，其中保护层还包括透明的导电氧化物。
11.根据权利要求10的光学记录介质，其中透明的导电氧化物选自In2O3、ZnO、Ga2O3、SnO2、Nb2O5和InGaO3中的一种或多种。
12.根据权利要求6到11中任何一项的光学记录介质，其中保护层具有10nm到300nm的厚度。
13.根据权利要求1到12中任何一项的光学记录介质，其中该反射层包括Ag和Ag合金中的任何一种，并且具有100nm到200nm的厚度。
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109819662A (zh) * 2017-09-21 2019-05-28 Ｊｘ金属株式会社 溅镀靶、积层膜的制造方法、积层膜及磁记录媒体

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008159228A (ja) * 2006-12-26 2008-07-10 Toshiba Corp 光ディスク及び光ディスク装置
JP5553723B2 (ja) * 2010-10-19 2014-07-16 富士フイルム株式会社 光情報記録媒体

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU514899B2 (en) * 1977-03-28 1981-03-05 Rca Corp. High density information record
US5419939A (en) * 1992-09-24 1995-05-30 Tdk Corporation Optical recording disk
US5633106A (en) * 1994-04-08 1997-05-27 Mitsui Toatsu Chemicals, Inc. Optical recording media and a method of recording and reproducing information
US6511788B1 (en) * 1999-02-12 2003-01-28 Sony Corporation Multi-layered optical disc
JP2001067728A (ja) * 1999-08-24 2001-03-16 Ricoh Co Ltd 相変化型光ディスク及びその製造方法
US20040085874A1 (en) * 2002-10-28 2004-05-06 Matsushita Electric Industrial Co., Ltd. Optical information recording medium, optical recording and reproducing method and optical recording and reproducing apparatus
US7439007B2 (en) * 2002-12-20 2008-10-21 Ricoh Company, Ltd. Phase change information recording medium having multiple layers and recording and playback method for the medium
JP2004227720A (ja) * 2003-01-27 2004-08-12 Tdk Corp 光記録媒体
JP2004253086A (ja) * 2003-02-21 2004-09-09 Ricoh Co Ltd ２層記録層型光記録媒体
JP2006525616A (ja) * 2003-05-07 2006-11-09 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ 高速記録用追記型光記録担体
JP4108553B2 (ja) * 2003-07-01 2008-06-25 株式会社日立製作所 光情報記録媒体及び光情報記録装置
JP2005044491A (ja) * 2003-07-10 2005-02-17 Ricoh Co Ltd 光記録媒体およびその製造方法
KR101049985B1 (ko) * 2003-08-07 2011-07-19 파나소닉 주식회사 광학적 정보 기록 매체와 그 제조 방법, 제조 장치, 기록재생 방법 및 기록 재생 장치
JP4141993B2 (ja) * 2003-08-07 2008-08-27 松下電器産業株式会社 光学的情報記録媒体
JP2005115997A (ja) * 2003-10-03 2005-04-28 Pioneer Electronic Corp 光記録媒体、およびその製造方法
JP2005302261A (ja) * 2004-03-19 2005-10-27 Ricoh Co Ltd 光記録媒体
EP1739667B1 (en) * 2004-04-22 2010-07-28 Mitsubishi Kagaku Media Co., Ltd. Optical recording medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109819662A (zh) * 2017-09-21 2019-05-28 Ｊｘ金属株式会社 溅镀靶、积层膜的制造方法、积层膜及磁记录媒体
CN109819662B (zh) * 2017-09-21 2021-11-23 Ｊｘ金属株式会社 溅镀靶、积层膜的制造方法、积层膜及磁记录媒体

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