CN1825447A - 光学记录介质 - Google Patents

光学记录介质 Download PDF

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Publication number
CN1825447A
CN1825447A CNA2006100080266A CN200610008026A CN1825447A CN 1825447 A CN1825447 A CN 1825447A CN A2006100080266 A CNA2006100080266 A CN A2006100080266A CN 200610008026 A CN200610008026 A CN 200610008026A CN 1825447 A CN1825447 A CN 1825447A
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CN
China
Prior art keywords
mentioned
substrate
recording layer
layer
record medium
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
CNA2006100080266A
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English (en)
Inventor
长泷义幸
太田宽纪
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.)
Maxell Holdings Ltd
Original Assignee
Hitachi Maxell Ltd
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Filing date
Publication date
Application filed by Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Publication of CN1825447A publication Critical patent/CN1825447A/zh
Pending legal-status Critical Current

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Abstract

本发明提供了一种可以采用短波长的记录再现光进行信息的记录再现的多层型光学记录介质。该光学记录介质(100)具有含有有机色素的二个记录层，其特征是：具有在由聚碳酸酯等构成的第一透明衬底(101)上依次叠层有第一记录层(102)和半透明中间层(103)的第一盘衬底以及在第二衬底(108)上叠层有反射层(107)、第二记录层(106)和界面层(105)的第二盘衬底；第一盘衬底和第二盘衬底通过透明粘结层(104)叠层，从而使半透明中间层(103)和界面层(105)相对；形成于第一记录层(102)或第二记录层(106)上的记录标记部分的反射率(R1)比未形成记录标记部分的反射率(R0)增高(R1＞R0)。

Description

光学记录介质
技术领域
本发明涉及光学记录介质，更详细地说，涉及具有含有有机色素的多个记录层的光学记录介质。
背景技术
近年来，由于信息通讯设备的发展对光学记录介质(光盘)的大容量化的要求越来越高。为了实现光盘的大容量化，正从以下几方面积极进行：记录再现光的短波长化，光学系统的透镜的高NA(数值孔径)化，道距的狭窄化，记录径迹的槽和槽脊记录以及记录层的多层化等。尤其是记录层的多层化，既不改变盘的尺寸又容易增加记录层的面积，而且不需要由于光学系统的透镜的高NA化而开发、研制物镜，不需要用于抑制面振动的生产技术以及用于确保防止污染性能的外盒等优点。
在此，作为将记录层做成二层的方法，通常可列举2P法和反叠层法。2P法是在形成于光入射侧的衬底上的第一记录层和半透明中间层上涂布光固化性树脂后压到光透射性原模上，通过对其进行光照射使其固化，然后剥离光透射性原模而转印出槽图案，再在该槽图案上形成第二记录层的方法(参照专利文献1：日本特开2003-331463号公报)。
利用上述的2P法制造的双层式光盘，由于是将单层结构的盘叠层构成的结构，因而除记录灵敏度问题外，与单层结构的盘一样能比较容易地进行记录和再现。但是，由于制造工序复杂，光透射性原模难于重复利用，存在制造成本高的问题。
另一方面，反叠层法是利用透明粘结剂来粘贴形成了第一记录层的第一衬底和形成了第二记录层的第二衬底的制造方法(参照专利文献2：日本特开2003-331473号公报)。
利用反叠层法制造的双层式光盘，与2P法相比，虽然具有能廉价地制造的优点，但是，激光入射侧的内侧的记录层和反射层的结构与单层盘相反，因而存在难以使记录再现特性达到最佳的问题。
为了解决这些问题，也有如下方法的报告：通过采用例如将第二记录层的膜厚度做成比第一记录层的膜厚度大等方法，从而，由反叠层法制造的双层式光盘的第二记录层可得到良好的再现记录信号(参照专利文献3：日本特开2004-348880号公报)。
然而，在以实现光盘的大容量化为目的而进行记录再现光的短波长化时，产生如下问题。例如，对于双层式光盘，由于必须在二个记录层的两方进行记录，因而从一侧的第一衬底侧入射的入射光的一半以上透过第一记录层和半透明的中间层。即，与只有一个记录层的单层式光盘相比，由于双层式光盘的灵敏度非常低，因而，为了在双层式光盘的记录层上进行记录，必须采用高输出功率的激光器。过去，在市场上销售的用2P法制成的DVD+R中，由于使用波长为约650nm、输出功率为150mW以上的高输出功率红色激光，即使记录层的灵敏度并不那么高，也可以实现双层式光盘的记录。但是，近年来，在以实现光盘的大容量为目的所使用的蓝色激光的情况下，存在的问题是难以确保红色激光那样的高输出功率。
其次，现有的CD-R或DVD-R，是通过对记录层照射的光而使有机色素爆发、同时使衬底变形来形成记录标记。在含有有机色素的记录层上这样形成的记录标记的部分与未形成记录标记的部分(空间)相比，其反射率降低(High to Low记录)。在采用这种记录方法的情况下，由于能提高记录层的未记录状态的反射率，虽然具有易于获得与ROM盘的记录再现特性的互换性之类的优点，但存在的问题是，因未记录状态的光吸收较少而使记录灵敏度降低。
发明内容
本发明就是为解决这些问题而完成的。
即，本发明的目的是，提供一种多层型光学记录介质，它可以在具有通过光照射能进行记录再现的含有有机色素的多层记录层的光学记录介质中，利用短波长的记录再现光进行信息的记录再现。
为了解决上述问题，在本发明中使用具有特定性质的有机色素来形成记录层。
即，根据本发明，提供了一种光学记录介质，其特征在于，至少具有2层通过照射光可以进行信息的记录再现的含有有机色素的记录层，在上述记录所层上形成的记录标记部分的反射率(R1)比在该记录层上的未形成记录标记的部分的反射率(R0)增高(R1＞R0)。
采用本发明的多层型光学记录介质，通过使用记录标记部分比未形成记录标记的位置相比反射率增高的低到高(Low to High)记录，可提高未记录状态的记录层的光吸收，吸收较多的激光能量，因而可提高记录灵敏度。
其中，优选的是，记录标记部分的反射率(R1)与未形成记录标记的部分的反射率(R0)之差(R1-R0)至少是2％。
另外，优选的是，在多个记录层中含有波长390nm-420nm的光的消光系数(k)为至少0.1的有机色素。
由在含有具有种性质的有机色素的多个记录层上所形成的记录标记得到的再现信号的调制度至少为40％。
另外，用于采用本发明的光学记录介质的记录再现的光，优选的是从光学记录介质的单侧进行照射。
其次，根据本发明，提供了一种光学记录介质，该光学记录介质具有含有有机色素的2层记录层，其特征在于：在由光透射性材料构成的第一衬底上具有依次叠层了第一记录层和半透明中间层的第一盘衬底，以及，在第二衬底上叠层了反射层、第二记录层和界面层的第二盘衬底；第一盘衬底和第二盘衬底通过透明粘结层叠层，从而使上述半透明中间层和上述界面层相对；在上述第一记录层或上述第二记录层上，通过照射的光形成的记录标记部分的反射率(R1)比未形成记录标记的部分的反射率(R0)增高(R1＞R0)。
即，采用本发明的光学记录介质，通过使透明粘结层介于形成了第一记录层的第一衬底和形成了第二记录层的第二衬底之间并将其贴合，能以低成本进行制造。
此处，优选的是，在上述第一衬底上所形成的槽的槽深度，具有在上述第二衬底上形成的槽的槽深度的至少2倍大小。
另外，优选的是，在上述第一衬底和上述第二衬底上所形成的槽的道距为390nm-410nm。
再有，优选的是，记录再现用的光是从第一衬底一侧照射，在从光入射一侧看跟前一侧的第一记录层和里侧的第二记录层上记录信息。
另外，本发明的双层式光学记录媒体，优选的是，从上述光照射的第一衬底一侧看，在第一衬底的前面一侧凹部存在的上述第一记录层的部分以及在第二衬底的里侧凹部存在的上述第二记录层的部分上，形成上述记录标记。
在这种情况下，优选的是，记录再现用的光的波长为390nm-420nm。
再有，作为记录层所含的有机色素，优选一甲碱-偶氮金属配位化合物类色素。
根据本发明，可以利用短波长的记录再现光，在具有含有有机色素的多层记录层的多层型光学记录介质上记录信息。
附图说明
图1是用于说明本实施例所采用的光学记录介质的层结构的图。
图中：
100…光学记录介质，101…第一透明衬底，102…第一记录层，103…半透明中间层，104…透明粘结层，105…界面层，106…第二记录层，107…反射层，108…第二衬底，109…第一记录层的凹部沟，110…第二记录层的凹部沟，120…激光
具体实施方式
下面，参照附图说明用于实施本发明的最佳方式(实施方式)。另外，本发明并不限定于以下的实施方式，在其宗旨的范围内可以作各种改变进行实施。另外，所使用的附图是用来说明本发明的实施方式的，并不表示实际的大小。
<光学记录介质>
图1是用于说明本实施方式所采用的光学记录介质的层结构的图。图1所示的光学记录介质100具有：具有径迹导向槽的盘状的第一透明衬底101，叠层在第一透明衬底101上的含有色素的第一记录层102，分配从第一透明衬底101侧入射的激光120的能量的半透明中间层103(第一盘衬底)。其次，还具有：具有径迹导向槽的盘状的第二衬底108，叠层在第二衬底108上的反射层107，含有色素的第二记录层106，以及界面层105(第二盘衬底)。
如图1所示，光学记录介质100具有的结构是，第一盘衬底和第二盘衬底通过透明粘结层104使叠层在第一透明衬底101上的半透明中间层103与叠层在第二衬底108上的界面层105相对地贴合在一起。
对于光学记录介质100，从单面入射波长为390nm-420nm的激光120，从光入射一侧看在前面一侧的第一记录层102和最里侧的第二记录层106上形成记录标记，进行信息的记录再现。本实施方式中，在光学记录介质100的第一记录层102上形成记录标记的位置，优选在第一透明衬底101上所形成的径迹导向槽的、从激光120入射一侧看是前面一侧的凹部的第一记录层的凹部沟109上存在的部分。另外，在第二记录层102上形成记录标记的位置，优选在第二衬底108上所形成的径迹导向槽的、从激光120入射一侧看是里面一侧凹部的第二记录层的凹部沟110上存在的部分。
本实施方式所采用的光学记录介质100的特征是，在第一记录层102或第二记录层106上，由所照射的激光120形成的记录标记部分的反射率(R1)比未形成记录标记部分的反射率(R0)增高(R1＞R0)(Low to High记录)。下面，对各层进行说明。
<记录层>
在本实施方式所采用的光学记录介质100的二个记录层(第一记录层102、第二记录层106)中，含有适于利用波长390nm-420nm的光进行信息记录的有机色素。作为第一记录层102或第二记录层106所使用的有机色素，例如可以举出：花青染料、部花青染料、斯夸利勿木色素(スクワリリウム)等聚甲炔染料；酞菁染料、紫菜碱色素等大环状氮杂轮烯类色素；蒽醌色素、三烯丙基甲烷色素，吡喃鎓色素，偶氮染料，含金属偶氮染料、三烯基胺染料、甲撑吡咯色素、甲臢金属配位化合物系色素、一甲碱-偶氮金属配合化合物系色素、轮烯系色素等，但也不限定于这些。
上述的这些有机色素，既可以使用一种，也可以将两种以上有机色素混合使用。另外，在二个记录层中也可以含有猝熄物、其它色素、添加剂、高分子(例如，硝基纤维素等热塑性树脂、热塑性弹性体)、金属微粒子等。
在本实施方式所采用的光学记录介质100的二个记录层(第一记录层102、第二记录层106)中，优选含有光吸收性高的有机色素。具体的是，二个记录层(第一记录层102、第二记录层106)中所含有的有机色素的、从第一透明衬底101一侧入射的波长为390nm-420nm的光的光学常数的消光系数(k)为0.1以上，优选0.15以上。但是，通常，消光系数(k)为0.3以下，优选0.25以下。
在光学记录介质100的二个记录层(第一记录层102、第二记录层106)中，通过含有波长为390nm-420nm的光的消光系数(k)在上述范围内的有机色素，可以在第一记录层102或第二记录层106上，进行利用所照射的光形成的记录标记部分的反射率(R1)比未形成记录标记部分的反射率(R0)增高(R1＞R0)的记录(Low to High记录)。
具体地说，在第一记录层102或第二记录层106上形成的记录标记部分的反射率(R1)和未形成记录标记部分的反射率(R0)之差(R1-R0)可以在2％以上，优选在5％以上。(R1-R0)至少为2％的情况下，由记录标记得到的再现信号可以获得至少40％的调制度。
此外，在第一记录层102或第二记录层106上形成的记录标记部分的反射率(R1)通常为6％-10％，优选6.5％-8％。另一方面，第一记录层102或第二记录层106的、未形成记录标记的部分的反射率(R0)通常为2％-5％，优选3％-4％。
本实施方式所采用的光学记录介质100，通过进行在记录层上形成的记录标记部分的反射率(R1)比未形成记录标记部分的反射率(R0)增高(R1＞R0)的记录(Low to High记录)，提高了记录层的未形成记录标记部分的光吸收，能吸收较多激光120的能量，从而能提高记录灵敏度。其结果，可以良好地进行以实现光盘大容量为目的的使用蓝色激光的信息记录再现。
作为形成第一记录层102和第二记录层106的方法，通常，可以列举下述方法，即，将上述的有机色素和根据需要添加的其它添加剂等溶解在公知的有机溶剂(例如，四氟丙醇、乙酮醇、乙酰丙酮、甲基溶纤剂、甲苯等)中或者溶剂化而制备的有机色素溶液，利用旋涂法涂布在各个衬底上的方法。作为旋涂法的条件，可以从衬底的内周到外周，以转数为300rpm-5000rpm之间的几种条件进行组合。第一记录层102和第二记录层106各自的厚度，可根据旋涂转速、有机色素溶液的浓度、粘度、溶剂的干燥速度等条件适当选择，设有特别的限定，通常，优选的是，形成槽的厚度为60nm-120nm左右，槽脊(land)厚度为40nm-80nm左右。
此外，本实施方式采用的光学记录介质100的二个记录层(第一记录层102和第二记录层106)所含的有机色素，优选的是波长为390nm-420nm的光的折射率(n)为1.5-2.3。另外，最大吸收波长优选420nm以上。
下面，说明构成本实施方式采用的光学记录介质100的其它层。
<第一透明衬底>
第一透明衬底101由透明、双折射率小等光学性能优异而且注射成形等成形性好的材料构成。并且，最好吸湿性小。作为构成第一透明衬底101的材料，没有特别的限定，可以列举例如，聚碳酸酯树脂、非晶态聚烯烃树脂、丙烯酸树脂、聚酯树脂等。
第一透明衬底101在一个面上形成螺旋状或同心圆状的循迹跟踪用槽。循迹跟踪用槽对于伺服用可以以一定周期摆动，或者对于地址用可以进行摆动周期的调制。另外，为了形成管理信息等，可以设置凹坑。在第一透明衬底101上所形成的循迹跟踪用槽的道距通常为390nm-410nm，优选395nm-405nm。此外，循迹跟踪用槽的深度通常为50nm-90nm，优选60nm-80nm。第一透明衬底101上所形成的槽的槽深度的大小优选具有在后述的第二衬底108上所形成的槽的槽深度的至少2倍。
第一透明衬底101的厚度优选为0.6mm左右。此外，第一透明衬底101的厚度可与其它层的厚度相配合调整。
第一透明衬底101优选的是先制作原盘及原模，然后利用注射成形法制作。此外，在第一透明衬底101和第一记录层102之间，可以设置由SiO2、ZnS-SiO2等构成的增强层及耐溶剂层。
<半透明中间层>
半透明中间层103优选的是，从第一透明衬底101一侧入射的激光120的吸收率小，光透射率在30％以上，并且通常具有适度的光反射率。例如，通过将反射率高的金属膜做得很薄，从而可以保持适当的光透射率和光反射率之间的平衡。另外，由于半透明中间层103的厚度极小(通常为3nm-5nm左右)，因而希望采用耐腐蚀性的材料。再有，在透明粘结层104上，最好具有可防止第一记录层102中所含有的有机色素渗出的屏蔽性。
半透明中间层103例如利用金(Au)、银(Ag)、铝(Al)或含有这些金属的合金等，采用溅射法形成。其中，以Ag为主成分的情况下，由于具有低成本和高反射率而特别优选选用。构成半透明中间层103的金属的晶粒尺寸过大时，由于成为记录再现光的噪声的原因，因而优选采用晶粒尺寸小的材料。另外，由于纯银具有晶粒尺寸大的倾向，因而银最好以合金形式使用。
在以Ag为主成分的合金中，除Ag以外，可以含有0.1原子％-5原子％的从由Ti、Zn、Cu、Pd、Au、Ca、In及稀土类金属构成的组中选择的至少一种元素。在以Ag为主成分的合金中，当含有从Ti、Zn、Cu、Pd、Au、Ca、In及稀土类金属中选择的二种以上的金属的情况下，各金属浓度为0.1原子％-5原子％，优选这些金属合计为0.1原子％-5原子％。在稀土类金属中，特别优选钕(Nd)。具体的，可列举AgPdCu、AgCuAu、AgCuAuNd、AgCuNd、AgCaCu、AgIn等。
作为半透明中间层103，只由Au构成的层的晶粒尺寸小，耐腐蚀性好，最为适合，但与Ag合金相比其价格高昂。另外，作为半透明中间层103，也可以使用SiO2等金属以外的材料，交替地叠层低折射率薄膜和高折射率薄膜而形成多层膜，从而形成具有适度的光透射性的反射层。
在第一记录层102和半透明中间层103之间，也可以设置由SiO2、ZnS-SiO2、Al2O3等构成的增强层、耐氧化层等其它层。另外，在半透明中间层103上还可以形成保护层。这种情况下，作为保护层，只要是能保护半透明中间层103的层即可，例如，可以由紫外线固化树脂、硅系树脂等形成。
<第二衬底>
第二衬底108最好用机械稳定性高、刚性大，进而注射成形等成形性优良的材料制成。另外，最好吸湿性小。但是，第二衬底108不一定要象上述的第一透明衬底101那样具有光透射性及光学特性。作为形成第二衬底108用的材料，除与第一透明衬底101同样的材料外，还可以列举ABS树脂、含有充填剂的环氧树脂、以Al为主成分合金例如Al-Mg合金等Al合金衬底等。
第二衬底108与第一透明衬底101同样，在一个面上形成螺旋状或同心圆状的循迹跟踪用槽。循迹跟踪用槽可以做成以一定周期摆动的伺服用槽，或者做成地址用的对摆动周期进行调制的槽。
形成于第二衬底108上的循迹跟踪用槽的道距通常为390nm-410nm，优选395nm-405nm。另外，循迹跟踪用槽的深度通常为10nm-40nm，优选15nm-35nm。并且，为了形成管理信息等，还可以设置凹坑。第二衬底108最好是先制成原盘及原模，然后利用注射成形制成。另外，第二衬底108的厚度最好约为0.6mm，可以与其它层的厚度相配合来调整。
<反射层>
反射层107希望具有高的反射率和优良的耐腐蚀性。为了提高反射率，反射层107的厚度通常为50nm以上，优选80nm以上。但是，为了提高记录灵敏度，最好薄到某种程度；并且，当反射层107的厚度过大时，有可能使第二衬底108翘曲，因而，其厚度通常为300nm以下，优选200nm以下。
作为形成反射层107用的材料，可以使用对于再现光的波长反射率足够高的材料(例如，60％以上)。可以列举例如，Al、Ag、Cu等金属或它们的合金。其中，优先选用Al、Ag或它们的合金。作为形成合金的成分，可以列举Mg、Se、Hf、V、Nb、Ru、W、Mn、Re、Fe、Co、Rh、Ir、Cu、Zn、Cd、Ga、In、Si、Ge、Te、Pb、Po、Sn、Bi及稀土类金属等金属及半金属。
上述金属等中，Ag合金的成本低、反射率高、耐腐蚀性优良，因而为首选。作为Ag合金，以Ag为主成分，最好含有0.1原子％-5原子％的选自由Ti、Zn、Cu、Pd、Au、Ca、In及稀土类金属构成的组中的至少一种元素。在Ti、Zn、Cu、Pd、Au、Ca、In及稀土类金属中含有二种以上元素的情况下，各自的金属浓度为0.1原子％-5原子％，优选它们的合计量为0.1原子％-5原子％。在稀土类金属中，特别优选钕。具体的，可列举AgPdCu、AgCuAu、AgCuAuNd、AgCuNd、AgCaCu、AgIn等。
作为形成反射层107的方法，例如可以举出溅射法、离子镀法、化学蒸镀法、真空蒸镀法等，从生产率考虑优选溅射法。
<界面层>
界面层105是为了遮蔽含有有机色素的第二记录层106和透明粘结层104、防止两层混合而在第二记录层106上形成的。即，如后文所述，为了防止用作透明粘结层104的液状的紫外线固化树脂与第二记录层106相溶而在两层的中间设置界面层105。
形成界面层105用的材料，只要是不与第二记录层106和透明粘结层104混合的材料均可，没有特别限定。可以兼有其它功能，也可以根据需要还夹有其它层。
作为形成界面层105的材料最好是无机物，例如，可列举金属或半导体、金属或半导体的氧化物、氮化物、硫化物、电介质等透明的无机物。具体地说，以下物质均适用：二氧化硅等氧化硅；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；氧化物与硫的混合物；以及后述的合金等。此外，氧化硅与硫化锌的按30∶70-90∶10左右(重量比)的混合物也适用。此外，硫及二氧化钇的混合物与氧化锌的混合物( Y2O2S-ZnO)也适用。
界面层105的厚度通常为3nm以上，优选5nm以上。但在100nm以下，优选50nm以下。界面层105的厚度过小时，有遮蔽防止不充分的倾向。界面层105的厚度过大时，光透射率有可能降低。另外，当界面层105为由无机物构成的层的情况下，有成膜时间延长、生产率降低，或者膜应力增大的倾向。作为形成界面层105的方法，可列举例如，溅射法、离子镀法、化学蒸镀法、真空蒸镀法等，从生产率考虑优选溅射法。
<透明粘结层>
透明粘结层104，除了对记录再现光的波长为透明的而外，最好是粘结力高、固化粘结时的收缩率小、环境保存稳定性高的材料。
本实施方式采用的光学记录介质100，由于在二个记录层(第一记录层102、第二记录层106)分别进行聚焦伺服，因而，最好对透明粘结层104的厚度104进行正确的调配。虽然采用了聚焦伺服机构，但透明粘结层104的厚度最好有必要在10μm以上。其倾向是，记录再现所使用的物镜的数值孔径越高，透明粘结层104的厚度可以越小。将厚度0.6mm的二片衬底贴合制成、使用蓝色激光用为记录再现光的情况下，透明粘结层104的厚度以约20μm为宜。透明粘结层104希望由对半透明中间层103不造成损伤的材料构成。另外，在两层的中间可以形成公知的无机或有机类的保护层。
作为形成透明粘结层104的材料，可以列举例如，热塑性树脂、热固性塑脂、电子射线固化性树脂、紫外线固化性树脂(包括延迟固化型)、压敏式双面胶带等。其中，无溶剂型紫外线固化性树脂具有优良的环境性能和较高的生产率而优先选用。紫外线固化性树脂有许多种，只要是透明的都可以使用。
作为紫外线固化性树脂，可以列举自由基类紫外线固化性树脂和阳离子类紫外线固化性树脂，任何一种都可以使用。作为自由基类紫外线固化性树脂，可以使用公知的所有组合物，可以使用作为必要成分包含紫外线固化性化合物和光聚合引发剂的组合物。作为紫外线固化性化合物，以单官能丙烯酸酯、单官能甲基丙烯酸酯、多官能丙烯酸酯、多官能甲基丙烯酸酯作为聚合性单体成分，可以分别单独使用或者两种以上并用。
作为单官能丙烯酸酯和单官能甲基丙烯酸酯，例如可以举出具有下列基团作为代换基的丙烯酸酯、甲基丙烯酸酯等，即：甲基、乙基、丙基、丁基、戊基、2-乙基己基、辛基、环己基、苄基、甲氧基乙基、丁氧基乙基、苯氧基乙基、四氢化糠基、缩水甘油基、2-羟乙基、2-羟丙基、二甲氨基乙基、壬基苯氧基乙基四氢化糠基、异冰片基、双环戊烯基(ジシクロペンタニル)等。
另外，作为多官能丙烯酸酯和多官能甲基丙烯酸酯，例如可以举出：1、3-丁二醇、1、4-丁二醇、1、5-戊二醇、3-甲基-1、5-戊二醇、1、6-己二醇、新戊二醇、1、8-辛二醇、乙二醇、聚乙二醇、丙二醇、二丙二醇、三丙二醇等二丙烯酸酯、二甲基丙烯酸酯等。
另外，可以在与上述聚合性单体同时并用聚合性低聚物。作为聚合性低聚物，例如可以列举：聚酯甲基丙烯酸酯、聚酯丙烯酸酯、聚醚甲基丙烯酸酯、聚醚丙烯酸酯、环氧甲基丙烯酸酯、环氧丙烯酸酯、氨基甲酸乙酯甲基丙烯酸酯、氨基甲酸乙酯丙烯酸酯等。
另外，作为光聚合引发剂，可使用公知的任何一种。所述的光聚合引发剂，最好是分子开裂型或氢脱出型。作为分子开裂型引发剂，例如可超出：苯偶姻异丁醚，2，4-二乙基噻吨酮、2-异丙基噻吨酮、苯偶酰、2，4，6-三甲基苯甲酰基二苯基氧化膦、2-苄基-2-二甲氨基-1-(4-吗啉代苯基)-丁-1-酮、双(2，6-二甲氧基苯甲酰基-2，4，4-三甲基戊基氧化膦等。
作为分子开裂型引发剂，例如可以举出：1-羟基环己基苯基酮、苯偶姻乙醚、苄基二甲基缩酮、2-羟基-2-甲基-1-苯基丙-1-酮、1-(4-异丙基苯基)-2-羟基-2-甲基丙-1-酮、2-甲基-1-(4-甲硫基苯基)-2-吗啉代丙-1-酮等。
另外，也可以使用氢脱出型光聚合引发剂。作为具体的例子可以举出：二苯甲酮、4-苯基二苯甲酮、间苯二甲酮、4-苯甲酰基-4’-甲基-二苯硫等。
另外，可以将增感剂与光聚合引发剂一起使用。作为增感剂，可以同时使用例如：三甲基胺、甲基二甲醇胺、三乙醇胺、P-二甲氨基苯甲酸乙酯、P-二甲氨基苯甲酸异戊酯、N，N-二甲基苄基胺等胺类。
作为阳离子类紫外线固化性树脂，可以使用公知的所有的组合物，没有特别的限定，通常可以列举含有阳离子聚合型的光聚合引发剂的环氧树脂。作为阳离子聚合型的光聚合引发剂，例如可以举出锍盐、碘鎓盐、重氮鎓盐等。作为碘鎓盐，可列举例如：六氟磷酸二苯碘、六氟锑酸二苯碘、四氟硼酸二苯碘、六氟锑酸双(十二苯基)碘、四氟硼酸双(十二苯基)碘、四(五氟苯基)硼酸双(十二苯基)碘、4-甲苯基-4-(1-甲基乙基)苯基碘六氟锑酸盐、4-甲苯基-4-(1-甲基乙基)苯基碘四氟代硼酸盐等。
作为环氧树指，可列举例如：双酚A-表氯醇型、脂环式环氧树脂、长链脂肪族型、溴化环氧树脂、缩水甘油酯型、缩水甘油醚型、杂环式系列等。所述的环氧树脂，最好使用游离的自由氯和氯离子含有率低的，以免对半透明中间层103造成损伤。具体地说，含氯量优选在1重量％以下，最好0.5重量％以下。
每100重量份的阳离子型紫外线固化性树脂中的阳离子聚合型光引发剂的比例，通常是0.1重量份-20重量份，优选0.2重量份-5重量份。此外，为了更有效地利用紫外线光源波长范围的近紫外线区域及可见光区域的波长，可以同时使用公知的增感剂。作为这时的增感剂，可列举例如：蒽、吩噻嗪、苄甲基酮缩醇、二苯甲酮、乙酰苯等。
再有，为了改进各种特性的目的，根据需要，可在紫外线固化性树脂中配合其它添加剂。作为其它添加剂，例如可以举出：热聚合阻止剂；受阻酚、受阻胺类抗氧化剂；增塑剂；环氧硅烷、巯基硅烷、甲基丙烯酰硅烷、丙烯酰硅烷等硅烷偶联剂等。这些其它的添加剂，选择使用对紫外线固化性化合物的溶解性好的、对紫外线的透射性没有影响的物质。
透明粘结层104，可以通过涂布紫外线固化性树脂后照射紫外线使其固化来形成。作为涂布方法，可以列举旋涂法、丝网印刷法、铸涂法等，其中优选旋涂法。作为紫外线固化性树脂，如果使用在温度为10℃-40℃下粘度为20mPa·s-1000mPa·s的树脂时，可以不用溶剂进行涂布，因而优先选用。
实施例
下面，根据实施例更具体地说明本实施方式。此外，本实施方式不受实施例的限定。
实施例1
通过以下的操作，制造具有含有有机色素的二个记录层的光学记录介质(1)。将形成了反时针回转方向的槽的原模A安装在注射成形机上，通过注射成形得到聚碳酸酯树脂制的第一透明衬底A。第一透明衬底A的直径为120mm、厚度为0.59mm，形成道距为0.40μm，半幅值为0.21μm、槽深为70nm的被调制了的摆动槽。另外，使用形成了顺时针回转方向的槽的原模B，采用同样的方法得到聚碳酸酯树脂制的第二衬底B。第二衬底B的直径为120mm、厚度为0.59mm，形成了道距为0.40μm、半幅值为0.21μm、槽深为15nm的被调制的摆动槽。
随后，在第一透明衬底A的形成槽的面上，采用旋涂法涂布用下述的化学式(1)表示的一甲碱-偶氮金属配位化合物类色素溶液(浓度为1.0重量％的四氟丙醇溶液)。另外，将上述色素溶液用过滤器过滤去除杂质，然后进行旋涂。并且，用化学式(1)表示的一甲碱-偶氮金属配位化合物(モノメチン一アゾ金属錯体)类色素的光学常数的消光系数(k)为0.2。
Figure A20061000802600171
接着，在90℃下将涂布了上述色素溶液的第一透明衬底A干燥1小时，然后，在室温下再冷却1小时，在第一透明衬底A上形成了第一记录层。接着，在已形成的第一记录层上，利用溅射法形成厚度为12nm的AgCuNd合金作为半透明中间层。
随后，在第二衬底B的槽形成面上，采用溅射法形成厚度为120nm的AgCuNd合金作为反射层。随后，通过与形成第一记录层同样的操作，在反射层上形成含有以化学式(1)表示的一甲碱-偶氮金属配位化合物类色素的第二记录层。进而，采用溅射法在第二记录层上形成厚度为12nm的ZnS-SiO2作为界面层。
接着，在第一透明衬底A上形成的半透明中间层上，采用旋涂法涂布自由基聚合型紫外线固化性树脂(UV树脂)，并将其设置在贴合装置上。然后，将第二衬底B设置在粘贴装置上，使形成于第二衬底B上的界面层与第一透明衬底A的UV树脂涂布面相对。随后，将装置内抽成真空，在UV树脂层中不产生发泡的情况下将第一透明衬底A和第二衬底B贴合在一起。然后，从贴合装置中取出贴合好的第一透明衬底A和第二衬底B，从第一透明衬底A一侧进行UV照射，使UV树脂固化，从而得到具有通过厚度20μm的透明粘结层将第一透明衬底A和第二衬底B贴合在一起的结构的光学记录介质(I)。
对于制造好的光学记录介质(I)，使用波长为405nm、数值孔径为0.65的记录再现评价机进行记录。记录光从第一透明衬底A照射。第一透明衬底A的记录径迹，从光照射一侧观察，使用了第一透明衬底A的径迹导向槽的面前侧凹部。第二衬底B的记录径迹，从光照射一侧观察，使用了第二衬底B的径迹导向槽的里侧凹部。以6m/s的线速度和频率60MHz的EFM信号为记录条件，可以在第一记录层上用12mW、在第二记录层上用14mW形成记录标记。
利用再现光再现时，在第一记录层上形成的记录标记部分的反射率为6.9％，未形成记录标记部分的反射率为3.8％。另外，第二记录层上所形成的记录标记部分的反射率为7.2％，未形成记录标记部分的反射率为3.9％。这样，在第一记录层和第二记录层进行了由低到高的(Low to High)记录。再有，基于在第一记录层上所形成的记录标记的再现信号的跳动(jitter)为7.5％，基于在第二记录层上所形成的记录标记的再现信号的跳动为7.8％，都可以观察到良好的眼图。
实施例2
除了将第二衬底B的槽深度改成25nm以外，进行与实施例1同样的操作，制造了具有含有有机色素的二个记录层的光学记录介质(II)。
随后，与实施例1同样，使用第一透明衬底A的径迹导向槽的前面一侧凹部作为第一透明衬底A的记录径迹，使用第二衬底B的径迹导向槽的里侧凹部作为第二衬底B的记录径迹，在第一记录层上用12mW形成记录标记，而在第二记录层上用14mW形成记录标记。
利用再现光再现时，在第一记录层上所形成的记录标记部分的反射率为6.9％，未形成记录标记部分的反射率为3.8％。另外，第二记录层上所形成的记录标记部分的反射率为6.8％，未形成记录标记部分的反射率为3.7％。基于在第一记录层上所形成的记录标记的再现信号的跳动为7.5％，基于第二记录层上所形成的记录标记的再现信号的跳动为7.6％，都可观察到良好的眼图。
比较例
除了使用以下述化学式(2)表示的有机色素作为记录层所含的有机色素外，进行与实施例同样的操作，制造具有含有有机色素的二个记录层的光学记录介质(III)。此外，以化学式(2)表示的有机色素的光学常数的消光系数(k)为0.08。
随后，与实施例1同样，使用第一透明衬底A的径迹导向槽的前面一侧凹部作为第一透明衬底A的记录径迹，使用第二衬底B的径迹导向槽的里侧凹部作为第二衬底B的记录径迹，在第一记录层及第二记录层上用记录再现装置的最大功率15mW进行记录。
利用再现光再现时，在第一记录层上所形成的记录标记部分的反射率为5.5％，未形成记录标记部分的反射率为7.6％。另外，第二记录层上所形成的记录标记部分的反射率为5.7％，未形成记录标记部分的反射率为7.8％。这样，从第一记录层及第二记录层得到的记录信号的极性，两者都是记录部分的反射率比未记录部分低的从高到低的方式。另外，信号的不对称性是负的，很明显，在记录功率不足状态下，不能测定跳动。
如上所述，通过从单侧照射蓝色激光，对于具有含有可记录再现的有机色素的二个记录层的光学记录介质来说，通过进行在记录层上所形成的记录标记部分的反射率(R1)比未形成记录标记部分的反射率(R0)增高(R1＞R0)的低到高的记录，可以实现记录灵敏度优良的二层型光学记录介质。
另外，通过使光学记录介质的结构形成如下所述的结构，即，将在具有槽的光透射性的第一衬底上依次叠层了第一记录层和半透明中间层的第一盘衬底和在第二衬底上叠层了反射层、第二记录层和界面层的第二盘衬底，通过透明粘结层进行贴合，使得上述半透明中间层和上述界面层彼此相对的结构，能以低成本地制造光学记录介质。

Claims (12)

1.光学记录介质，其特征在于，至少具有二层通过光照射可以进行信息的记录再现的含有有机色素的记录层，在上述记录层上所形成的记录标记部分的反射率(R1)比在该记录层上的未形成上述记录标记部分的反射率(R0)增高(R1＞R0)。
2.根据权利要求1所述的光学记录介质，其特征在于，上述记录标记部分的反射率(R1)与未形成该记录标记部分的反射率(R0)之差(R1-R0)至少是2％。
3.根据权利要求1所述的光学记录介质，其特征在于，上述有机色素的波长为390nm-420nm的光的消光系数(k)至少是0.1。
4.根据权利要求1所述的光学记录介质，其特征在于，由上述记录标记得到的再现信号的调制度至少为40％。
5.根据权利要求1所述的光学记录介质，其特征在于，上述光从单侧照射。
6.光学记录介质，具有含有有机色素的二个记录层，其特征在于：具有在由光透射性材料构成的第一衬底上依次叠层有第一记录层和半透明中间层的第一盘衬底，以及在第二衬底上叠层有反射层、第二记录层和界面层的第二盘衬底；上述第一盘衬底和上述第二盘衬底通过透明粘结层叠层，从而使上述半透明中间层和上述界面层相对；在上述第一记录层或上述第二记录层上，通过照射的光形成的记录标记部分的反射率(R1)比未形成上述记录标记部分的反射率(R0)增高(R1＞R0)。
7.根据权利要求6所述的光学记录介质，其特征在于，在上述第一衬底上所形成的槽的槽深度具有在上述第二衬底上形成的槽的槽深度的至少2倍大小。
8.根据权利要求6所述的光学记录介质，其特征在于，在上述第一衬底和上述第二衬底上所形成的槽的径迹间距为390nm-410nm。
9.根据权利要求6所述的光学记录介质，其特征在于，上述光从上述第一衬底一侧照射。
10.根据权利要求6所述的光学记录介质，其特征在于，从照射上述光的上述第一衬底侧观察，在该第一衬底的前面侧凹部存在的上述第一记录层的部分以及在上述第二衬底的里侧凹部存在的上述第二记录层的部分上形成上述记录标记。
11.根据权利要求6所述的光学记录介质，其特征在于，上述光的波长是390nm-420nm。
12.根据权利要求6所述的光学记录介质，其特征在于，上述有机色素是一甲碱—偶氮金属配位化合物。
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