CN1445766A - 光信息记录介质 - Google Patents

光信息记录介质 Download PDF

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CN1445766A
CN1445766A CN03107069A CN03107069A CN1445766A CN 1445766 A CN1445766 A CN 1445766A CN 03107069 A CN03107069 A CN 03107069A CN 03107069 A CN03107069 A CN 03107069A CN 1445766 A CN1445766 A CN 1445766A
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layer
recording medium
optical information
desirable
information recording
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CN100394497C (zh
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石田寿男
宇佐美由久
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Fujifilm Corp
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Fujifilm Corp
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Abstract

一种光信息记录介质,在形成磁道间距为200~400nm、深度为10~150nm的槽的衬底上依次设置光反射层、记录层和保护层,并且从所述保护层侧照射波长小于500nm的激光而进行记录和再生,其特征在于,所述光反射层是由铝或铝合金构成。所述光信息记录介质,通过使用由铝或铝合金构成的光反射层,降低了成本的同时具有优异的记录特性。

Description

光信息记录介质
技术领域
本发明涉及一种光信息记录介质,特别是涉及热模式的追加型光信息记录介质。
背景技术
迄今,人们知道的是通过激光只能进行一次信息记录的光信息介质(光盘)。所述光盘也称作追加型CD(所谓的CD-R),其典型的结构是,在透明的圆盘状衬底上依次叠层由有机色素构成的记录层、由金等金属构成的光反射层、树脂材料的保护层而构成。另外,向所述CD-R记录信息是通过向CD-R照射近红外区域的激光(通常是780nm附近波长的激光)而进行,记录层的照射部分吸收所述光而温度局部上升后,由物理或化学变化(例如生成槽),该部分的光学特性发生变化,从而进行信息记录。另外,信息的读取(再生)也将和记录用激光相同波长的激光向CD-R照射,并通过检测出记录层中光学特性发生改变的部位(记录部分)和没有发生改变的部位(未记录部分)之间反射率的差异而进行。
近年来,需求记录密度更高的光信息记录介质。响应于这种需求,提出的是追加型数字通用·光盘(所谓DVD-R)(例如[日经new media]附刊[DVD]、1995年发行)。所述DVD-R通常具有,在透明圆盘状衬底上依次层叠含有机色素的记录层、光反射层以及保护层后得到的2张盘,以记录层为内侧贴合在一起,或者该盘和具有同样形状的圆盘状保护衬底,以记录层为内侧贴合在一起的结构,其中在所述透明圆盘状衬底上形成的用于引导照射激光的导向槽(预刻槽)的宽度小于CD-R导向槽宽1/2(0.74~0.8μm)。并且,通过照射可见激光(通常是630nm~680nm范围波长的激光)向所述DVD-R记录信息和再生信息,从而能够实现比CD-R密度更高的记录。
最近,因特网等的网络系统或高清晰度电视迅速地普及起来。另外,也即将实现HDTV(High Definition Television)的放映。在这种形势下,需要的是能够便宜简便地记录图象信息的大容量记录介质。目前DVD-R,作为大容量记录介质发挥着非常重要的作用,但是对大容量化、高密度化要求在不断提高,而能够适应所述要求的记录介质的开发也是必须的。因此,正在进行能够在比DVD-R更短波长的光下进行高密度记录的容量更大的记录介质的开发。
例如,在特开平4-74690号公报、特开平7-304256号公报、特开平7-304257号公报、特开平8-127174号公报、特开平11-53758号公报、特开平11-334204号公报、特开平11-334205号公报、特开平11-334206号公报、特开平11-334207号公报、特开2000-43423号公报、特开2000-108513号公报、特开2000-113504号公报、特开2000-149320号公报、特开2000-158818号公报以及特开2000-228028号公报中提出,在记录层中含有机色素的光信息记录介质中,通过从记录层侧向光反射层侧,照射波长小于530nm的激光,而进行信息记录和再生的记录再生方法。所述这些方法是,通过向在记录层中含有卟啉化合物、偶氮系色素、金属偶氮系色素、奎酞酮系色素、三次甲基花青苷色素、二氰乙烯基苯基骨架色素、香豆素化合物、萘酚花青苷色素等的光盘,照射蓝色(波长430nm、488nm)或者是青绿色(波长515nm)激光,而进行信息记录和再生。
但是,本发明者根据研究探讨明确了以下事实:即通过向在所述公报中所记载的光盘,照射波长小于450nm的短波长激光而记录信息时,无法得到实用上所需要的感度,并且无法满足反射率或调制度等其它记录特性,从而需要进一步的改进。特别是,向在所述公报中所记载的光盘照射波长小于450nm的激光时,确认光盘的记录特性下降。
另外目前提出,通过在所述公报中所记载的光盘的光反射层中使用银(Ag),而进一步提高光盘的反射率。但是,如果在光反射层中使用Ag,将会带来成本高的问题,并由此在批量生产所述光盘时将成为一个大问题。另外根据形成条件,会带来由Ag构成的光反射层的耐腐蚀性降低的问题。
发明内容
本发明的目的在于,通过使用由铝或铝合金构成的光反射层,提供一种成本下降的同时具有优异记录特性的光信息记录介质。
所述目的是通过如下所示的本发明而完成的。即,本发明是在形成磁道间距为200~400nm、槽深为10~150nm的槽的衬底上依次设置光反射层、记录层和保护层,并且通过从所述保护层侧,照射波长小于500nm的激光而进行记录和再生的光信息记录介质,其特征在于,所述光反射层是由铝或铝合金构成。
另外,本发明的光信息记录介质的光反射层的厚度在20~200nm范围是理想的,而光反射层的成膜速度在6至95nm/s的范围是理想的。
具体实施方式
本发明是在形成磁道间距为200~400nm、深度为10~150nm的槽的衬底上依次设置光反射层、记录层和保护层,并且通过从所述保护层侧,照射波长小于500nm的激光而进行记录和再生的光信息记录介质,其特征在于,所述光反射层是由铝或铝合金构成。
下面,详细说明本发明的光信息记录介质。[光反射层]
光反射层是为了在信息再生时提高反射率而设置的。本发明的光反射层需要由比银(Ag)或金(Au)便宜的铝或铝合金构成。由铝或铝合金构成的光反射层,对激光的反射率大于70%是理想的,更为理想的是大于75%,特别理想的是大于80%。
用于光反射层中的铝或铝合金可以例举为,作为工业用铝而使用的纯度大于99.0%的纯铝和以铝作为主要成分并含有微量异元素的合金,但从反射率的角度考虑,理想的是纯铝。
作为在铝合金中含有的微量异元素,理想的是含有0.1至10质量%的选自元素周期表中的1种以上元素。在铝合金中含有的异元素的代表例是硅(Si)、铁(Fe)、铜(Cu)、锰(Mn)、镁(Mg)、铬(Cr)、锌(Zn)、锆(Zr)、钛(Ti)、钒(V)、镍(Ni)、铋(Bi)、银(Ag)、金(Au)、铂(Pt)等。
其中,作为在铝合金中含有的异元素,理想的是不会使反射率降低的小于1质量%的Si或Mg、以及Ag、Au、Pt、Cu等。
可以通过蒸镀、溅射或者离子镀敷(ion plating)所述铝和铝合金,而在衬底上形成光反射层。其中,通过溅射形成光反射层是理想的。
下面,详细说明通过溅射形成的本发明光信息记录介质的光反射层的形成方法。
作为用于溅射的放电用气体,理想的是使用Ar。另外,理想的溅射条件是:Ar流量1至50sccm、功率:0.5至10kw、成膜时间0.1至30秒,更理想的条件是:Ar流量3至20sccm、功率:1至7kw、成膜时间0.5至15秒,特别理想的条件是:Ar流量4至10sccm、功率:2至6kw、成膜时间1至5秒。
另外,理想的溅射条件是Ar流量、功率以及成膜时间中的任意一个在所述范围之内,更为理想的条件是其中的2个以上在所述范围之内,特别理想的是条件是全部均在所述范围之内。
通过在所述这些溅射条件下形成光反射层,能够得到反射率提高或耐蚀性进一步得到提高,且具有优异的记录特性的光信息记录介质。
光反射层的厚度在20至200nm范围内是理想的,更理想的是30至180nm的范围,特别理想的是35至160nm的范围。如果层厚小于20nm,则出现无法得到所期望的反射率或保存时反射率下降的问题,而且有时还出现不能得到足够的记录振幅的问题。但如果层厚大于200nm,则有时出现表面形状粗糙,反射率下降的问题。
另外,反射层的成膜速度在6至95nm/s范围内是理想的,更理想的是在7至90nm/s的范围,特别理想的是8至80nm/s的范围。如果成膜速度小于6nm/s,则在溅射过程中容易进入氧,并由氧化有时会导致反射率下降或光反射层的耐腐蚀性下降。如果成膜速度大于95nm/s,则温度上升得高,有时在衬底上出现翘曲。[衬底]
作为衬底,可以例举玻璃;聚碳酸酯、聚甲基丙烯酸甲酯等丙烯酸树脂;聚氯乙烯、氯乙烯共聚物等氯乙烯系树脂;环氧树脂;无定形聚烯烃;聚酯;铝等金属;根据需要,也可以组合使用。所述材料中,从耐湿性、尺寸稳定性以及价格等角度出发,理想的是聚碳酸酯或无定型聚烯烃,特别理想的是聚碳酸酯。
另外,衬底厚度在1.1±0.3mm范围是理想的。
在衬底10的表面上形成有引导用的槽或者是表达地址信号等信息的凹凸(预刻槽)。所述预刻槽是以注射成形或挤出成形聚碳酸酯等树脂材料时,直接在衬底上形成为理想。
另外,也可以通过设置预刻槽层的方法来形成预刻槽。作为预刻槽层的材料,可以使用丙烯酸的单酯、二酯、三酯以及四酯中的至少一种单体(或低聚物)和光聚合引发剂的混合物。预刻槽层的形成方法例如是,首先在精密制作的母型(stamper)上涂布由所述丙烯酸酯和聚合引发剂组成的混合液,然后在该涂布液层上载置衬底,接着通过衬底或母型照射紫外线,固化涂布层以粘合衬底和涂布层。最后从母型剥离衬底,得到预刻槽层。预刻槽层的层厚通常在0.01至100μm的范围,理想的范围是在0.05至50μm的范围。
为了达到更高的记录密度,使用形成有比CD-R或DVD-R更窄的磁道间距的预刻槽的衬底是理想的。在本发明中,衬底的预刻槽的磁道间距必须是在200至400nm的范围,理想的是250至350nm的范围。
另外,预刻槽的槽深度在10至150nm范围,更理想的是在20至100nm的范围,特别理想的是30至80nm的范围。另外,其半辐值在50至250nm的范围是理想的,更理想的是在100至200nm的范围。
另外,理想的是在设置所述光反射层的衬底表面上,以改善平面性、提高粘接力为目的,形成底涂层。
作为该底涂层的材料,可以例举聚甲基丙烯酸甲酯、丙烯酸-甲基丙烯酸共聚物、苯乙烯-马来酸酐共聚物、聚乙烯醇、N-羟甲基丙烯酰胺、苯乙烯-乙烯基甲苯共聚物、氯磺酰化聚乙烯、硝酸纤维素、聚氯乙烯、氯化聚烯烃、聚酯、聚亚胺、醋酸乙烯-氯乙烯共聚物、乙烯-醋酸乙烯共聚物、聚乙烯、聚丙烯、聚碳酸酯等高分子物质;有机硅烷偶合剂等表面改性剂等。
底涂层可以通过,将所述材料溶解或分散到适当的溶剂中制备涂布液之后,利用旋转涂层法、浸渍涂层法、挤出涂层法等涂布法,在衬底表面上涂布而形成。底涂层的厚度通常为0.005至20μm,理想的是0.01至10μm的范围。[记录层]
为了在500nm波长的激光下进行记录和再生,在记录层中含有在激光波长区域内有极大吸收的色素是理想的。所使用的色素可以例举花青苷色素、氧杂菁色素、金属配位化合物系色素、偶氮色素、酞菁色素等。
具体地可以例举,在特开平4-74690号公报、特开平8-127174号公报、特开平11-53758号公报、特开平11-334204号公报、特开平11-334205号公报、特开平11-334206号公报、特开平11-334207号公报、特开2000-43423号公报、特开2000-108513号公报以及特开2000-158818号公报等中所记载的色素或者是三唑、三嗪、花菁苷、份菁、氨基丁二烯、酞菁、肉桂酸、氧化还原色素、偶氮、氧杂菁苯并噁唑、苯并三唑等色素,其中理想的是花菁苷、氨基丁二烯、苯并三唑、酞菁。
记录层是通过,将所述色素和根据需要而加的粘合剂一同溶解于适当的溶剂中而制备涂布液后,将该涂布液涂布在所述光反射层的表面上,形成涂膜,最后进行干燥而形成。根据需要,还可以在涂布液中加入防氧化剂、紫外线吸收剂、增塑剂以及润滑剂等各种添加剂。
另外,作为溶解处理色素或粘合剂的方法,可以使用超声波处理、均化器处理、分散处理、混砂机处理、搅拌器搅拌处理等方法。
用于制备记录层涂布液的溶剂,可以例举乙酸丁酯、乙酸溶纤剂等酯;甲乙酮、环己酮、甲基异丁酮等酮;二氯甲烷、1,2-二氯乙烷、三氯甲烷等的氯代烃;N,N-二甲基甲酰胺等酰胺、环己烷等烃;四氢呋喃、乙醚、二噁烷等醚;乙醇、正丙醇、异丙醇、正丁醇、二丙酮醇等醇;2,2,3,3-四氟丙醇等氟系溶剂;乙二醇单甲醚、乙二醇单乙醚、丙二醇单甲醚等醇醚类等。考虑所使用的色素及粘合剂的溶解性,所述溶剂可以单独或者是适当组合2种以上使用。
作为粘合剂,可以例举明胶、纤维素衍生物、葡萄糖、松脂、橡胶等天然有机高分子物质;聚氨酯、聚乙烯、聚丙烯、聚苯乙烯、聚异丁烯等烃系树脂;聚氯乙烯、聚偏氯乙烯、聚氯乙烯-聚醋酸乙烯酯聚合物等乙烯系树脂;聚丙烯酸甲酯、聚甲基丙烯酸甲酯等丙烯酸树脂;聚乙烯醇、氯代聚乙烯、环氧树脂、丁缩醛树脂、橡胶衍生物、苯酚-木质素-甲醛树脂等热固化性树脂的初期缩合物等合成有机高分子等。将粘合剂作为记录层材料一同使用时,粘合剂的使用量理想的是相对色素的0.01倍量至50倍量(质量比),更理想的是0.1至5倍量。通过在记录层中包含粘合剂,能够改善记录层的保存稳定性。
按所述制备的涂布液中的色素浓度通常是0.01至10质量%范围,理想的是0.1至5质量%范围。
作为涂布方法,可以例举喷涂法、旋转涂层法、浸渍法、辊涂法、刮板涂层法、括刀辊法、网板印刷法等。记录层可以是单层,也可以是多层。另外,记录层的厚度通常在20至500nm的范围,理想的是50至300nm的范围。
另外,作为涂布温度,如果在23至50℃的范围之内就不会有很大的问题,理想的是24至40℃,更理想的是25至37℃。
为了提高所述记录层的耐光性,可以在记录层中含有各种防退色剂。作为防退色剂,通常使用是单态氧猝灭剂。作为单态氧猝灭剂,可以使用记载于已经公知的专利说明书等刊物的物质。
其具体例,可以例举在特开昭58-175693号公报、特开昭59-81194号公报、特开昭60-18387号公报、特开昭60-19586号公报、特开昭60-19587号公报、特开昭60-35054号公报、特开昭60-36190号公报、特开昭60-36191号公报、特开昭60-44554号公报、特开昭60-44555号公报、特开昭60-44389号公报、特开昭60-44390号公报、特开昭60-54892号公报、特开昭60-47069号公报、特开昭63-209995号公报、特开平4-25492号公报、特开平1-38680号公报以及特开平6-26028号公报等公报、德国专利350399号说明书及日本化学会志1992年10月号第1141页中所记载的。
所述单态氧猝灭剂等防退色剂的含量,通常是记录层总固形物的0.1至50质量%范围,理想的是0.5至45质量%范围,更理想的是3至40质量%范围,特别理想的是5至25质量%范围。
在所生成的记录层的表面上可以形成屏障层,以便于提高与保护层之间的粘接性和色素的保存性。屏障层是由Zn、Si、Ti、Te、Sm、Mo、Ge等的任意一种元素以上的氧化物、氮化物、碳化物以及硫化物等材料所构成的层,另外,屏障层可以是类似于ZnS-SiO2的混合物。屏障层可以通过溅射、离子镀敷等方法形成,其理想的厚度是1至100nm。
[保护层]
保护层是使用粘接剂或粘合剂(通过粘接层或粘合层),形成于记录层侧的表面上。
保护层对用于记录和再生的激光的透光率大于80%是理想的,更理想的是大于90%。另外,理想的是,保护层为表面粗糙度Ra小于5nm的树脂薄膜。作为所述树脂薄膜,可以例举聚碳酸酯(帝人社制bjuaeise、帝人化成社制panlaito)、三乙酸纤维素(富士薄膜社制fujitaku)、PET(东丽社制rumila),其中更理想的是聚碳酸酯和三乙酸纤维素。另外,保护层的表面粗糙度Ra取决于树脂种类、制膜方法、是否含有填料等。保护层的表面粗糙度Ra是例如通过WYKO社制HD2000测定。
保护层的厚度是根据为了记录和再生而照射的激光的波长或NA而规定为适当值,理想的是0.03至0.15mm的范围,更理想的是0.05至0.12mm的范围。另外,保护层、粘接层或粘合层的总厚度在0.09至0.11mm是理想的,更理想的是在0.095至0.105mm的范围。
作为使用的粘接剂,理想的是UV固化树脂、EB固化树脂、热固化树脂等。特别理想的是使用UV固化树脂。
理想的是,例如在叠层体的贴合(记录层等)面上涂布一定量粘接剂,贴合保护层薄膜之后,通过旋转涂层法把粘接剂均匀地铺在叠层体和保护层之间进行固化。
调整涂布的粘接剂的量,使最终形成的粘接层的厚度在0.1至100μm的范围,理想的是在0.5至50μm的范围,更理想的是在10至30μm的范围。
使用UV固化树脂作为粘接剂时,可以直接使用该UV固化树脂,或者是把UV固化树脂溶解于甲基乙基甲酮、乙酸乙酯等适当溶剂中,制备涂布液之后,从配合器供给叠层体表面。另外,为了防止所制作的光信息记录介质的翘曲,构成粘接层的UV固化树脂的固化收缩率小为理想。作为这样的UV固化树脂,可以例举日本油墨化学工业(株)社制的[SD-640]等的UV固化树脂。
另外,作为用于固化这些UV固化树脂的UV照射机,可以使用任意一种,但理想的是使用脉冲型UV照射机。这里,作为UV照射条件,理想的是脉冲间隔在msec以下,更理想的是在μsec以下。另外,对1脉冲的照射功率没有特别的限定,但理想的是3kw/cm2以下,更理想的是2kw/cm2以下。并且,照射次数没有特别的限定,理想的是20次以下,更理想的是10次以下。
另外,作为粘附剂,可以使用丙烯酸系、橡胶系、硅酮系的粘接剂,但从透明性、耐久性的观点考虑,理想的是丙烯酸系粘接剂。作为相关的丙烯酸系粘接剂,理想的是使用以2-乙基丙烯酸己酯、丙烯酸正丁酯等作为主要成分,并共聚合用于提高凝聚力的短链丙烯酸烷基酯或甲基丙烯酸酯例如丙烯酸甲酯、丙烯酸乙酯、甲基丙烯酸甲酯和可以作为交联剂交联点的丙烯酸、甲基丙烯酸、丙烯酰胺衍生物、马来酸、丙烯酸羟乙基酯、缩水甘油丙烯酸酯等后的共聚物。通过适当地调节主要成分、短链成分以及赋予交联点的组分的混合比例、种类,可以改变玻璃化转变温度(Tg)或交联密度。
与所述粘附剂并用的交联剂可以例举异氰酸酯系交联剂。相关的异氰酸酯系交联剂可以使用:甲苯撑二异氰酸酯、二苯甲烷-4-4’-二异氰酸酯、六亚甲基二异氰酸酯、苯二甲基二异氰酸酯、1,5-二异氰酸萘酯、o-甲苯胺异氰酸酯、异佛尔酮二异氰酸酯、三苯甲烷三异氰酸酯等异氰酸酯类,或者所述异氰酸酯类和多元醇的生成物,或者通过异氰酸酯类的缩合而生成的聚异氰酸酯类。所述异氰酸酯类的市售商品可以例举日本聚氨酯社制的colonato L、colonato HL、colonato2030、colonato2031、milionato MR、milionato HTL、武田药品社制的takenatoD-102、takenato D-110N、takenato D-200、takenato D-202、住友baieil社制的deismogjul L、deismogjul IL、deismogjul N、deismogjul HL等。[其它层]
在本发明的光信息记录介质中,除了所述任意层之外,还可设有各种中间层。例如在光反射层和记录层之间可设置用于提高反射率和粘接性的中间层。
本发明光信息记录介质的激光入射侧的表面粗糙度是根据所使用的保护层的表面粗糙度、衬底的表面粗糙度、光反射层的制作条件、记录层的种类、制膜条件、粘接层的种类、涂布条件、保护层的种类和涂布条件等而适当选择。
本发明的光信息记录介质例如按照以下方法进行信息的记录、再生。首先,以一定的线速度(0.5至10m/秒)或者以一定的角速度旋转光信息记录介质,同时从保护层侧,通过物镜照射蓝紫色激光(例如波长为405nm)等记录用的光。通过所述光的照射,记录层将吸收所述光,使其局部温度上升,例如通过生成槽,改变其光学特性而记录信息。对按照所述记录的信息的再生,可以是通过以一定的线速度旋转光信息记录介质,同时从保护层侧照射蓝紫色激光,而检出所述反射光的方法来进行。
作为振动波长低于500nm的激光光源,可以例举具有390至415nm范围振动波长的蓝紫色半导体激光、中心振动波长为425nm的蓝紫色SHG激光等。
另外,为了提高记录密度,用于拾音器的物镜的NA大于0.7是理想的,大于0.85将更为理想。
下面,详细说明本发明的实施例,但本发明并不限于这些实施例。
(实施例1)
在由注射成形聚碳酸酯树脂构成的衬底的具有厚度为1.1mm、外径为120mm、内径为15mm的螺旋状槽(槽深:30nm、槽宽:150nm、磁道间距:340nm)的面上,在Ar气氛下,通过DC溅射,形成由铝(Al:纯度99.9质量%以上)构成的光反射层。在表1中记载溅射的详细条件。
然后,把用下述化学式表示的色素2g加入到2,2,3,3-四氟丙醇100ml中,进行溶解,制备色素涂布液。用旋转涂层法,边将转速从300rpm变化至4000rpm,边在23℃、50%RH的条件下,在光反射层上涂敷所述色素涂敷液。然后在23℃、50%RH下保存1小时,形成记录层(内槽(ingroove)厚度:100nm、上槽(on groove)厚度:70nm)。【化1】
Figure A0310706900131
形成记录层之后,在干净的烤箱中进行退火处理。即在垂直的叠杆(stack pole)上相隔一定距离用垫片支撑衬底,在40℃下保持1小时而进行退火处理。
然后通过RF溅射,在记录层上形成由ZnS-SiO2(ZnS∶SiO2=8∶2(质量比))构成的屏障层(厚度为50nm),而制成了叠层体。屏障层的形成条件如下。
功率:4kw
压力:2×10-2hPa
时间:10秒
接着固定喷嘴,把叠层体略旋转1周,从而在形成的屏障层上环状地分散UV固化粘接剂(日本油墨社制ex8204)。然后,中心重合地放置由聚碳酸酯构成的保护层(帝人社制bjuaeise、外径120mm、内径15mm、厚度85μm),在5000rpm的转速下旋转3秒钟,从而把粘接剂铺在整面上,同时振动除去多余的粘接剂。另外,旋转的同时照射紫外线,以固化粘接剂,最后制得实施例1的光信息记录介质。这时,粘接层的厚度为15μm,保护膜和粘接层的总厚度为100μm。另外,能够使得贴合后粘接层上没有气泡。
(对光信息记录介质的记录特性评价)-C/N(载波对噪声比)
使用载置有405nm的激光、NA:0.85拾音器的记录再生评价机(pulsedake社制:DDU1000),在记录功率5mW、线速5m/s的条件下,于得到的光信息记录介质上形成600nm的槽,用光谱分析器测定C/N。在表1中表示了其结果。
表1
 光反射层材料  厚度(nm)  Ar流量(sccm)  溅射功率(kw)  成膜时间(秒)  未记录噪声(%)  C/N(dB)
实施例1  Al  80  5  2  5  5  52
实施例2  Al  40  5  2  2.5  4  52
实施例3  Al  150  5  2  9  10  51
实施例4  Al  80  5  1  10  21  53
实施例5  Al  80  5  0.5  20  33  51
实施例6  Al  80  2  2  4.4  30  49
实施例7  Al-Ti  60  7  5  1.6  4  51
实施例8  Al  60  7  5  1.6  5  51
实施例9  Al  70  5  2  4.4  8  51
实施例10  Al  70  3  2  4.4  10  50
实施例11 Al 70 20 2 4.4 15 50
实施例12  Al  70  22  2  4.4  20  50
实施例13  Al  40  7  1  5.5  30  50
实施例14  Al  60  7  1.5  5  15  51
实施例15  Al  70  7  2  4.4  7  51
实施例16  Al  70  7  7  1.2  10  50
实施例17  Al  50  7  8  0.8  20  51
实施例18  Al  25  7  5  0.5  10  50
实施例19  Al  20  7  5  0.4  15  50
实施例20  Al  60  7  5  1.6  5  52
实施例21  Al-Ta  60  7  5  1.6  4  52
实施例22  Al-Cr  60  7  5  1.6  5  51
比较例1  Ag  80  5  2  5  60  47
比较例2  Au  80  5  2  5  50  45
对于所制得的光信息记录介质,使用载置405nm的激光、NA:0.85拾音器的记录再生评价机(pulse dake社制:DDU1000),测定其未记录的RF信号的幅度以及未记录反射率,并把RF信号的幅度除以未记录反射率后得到的值作为未记录噪声。在表1中表示了其结果。(实施例2至5)
除了如表1所示地改变实施例1的光反射层形成条件以外,与实施例1相同地制作实施例2至5的光信息记录介质。
对得到的光信息记录介质,进行与实施例1相同的试验,以评价记录特性。在表1中表示了其结果。
(实施例6至19)
在所述表1所示的条件和Ar气氛下,通过DC溅射,在由注射成形聚碳酸酯树脂(帝人社制聚碳酸酯;商品名panlaido AD5503)构成的衬底的具有厚度为1.1mm、外径为120mm、内径为15mm的螺旋状槽(槽深:40nm、槽宽:150nm、磁道间距:320nm)的面上形成由铝或铝合金构成的光反射层。另外,在实施例7中,铝合金(Al-Ti)中的Ti含量是2at%。
然后,将用下述化学式表示的有机物2g与乳酸甲酯100ml混合,超声波处理2小时进行溶解,制得色素涂布液。用旋转涂层法,边将转速从300变化至4000rpm,边在23℃、50%RH的条件下,在光反射层上涂敷所述色素涂敷液。形成的记录层的内槽厚度:100nm,上槽厚度:70nm。【化2】
Figure A0310706900151
形成记录层之后,在23℃下退火处理2小时。
然后在记录层上,通过RF溅射,形成由ZnS-SiO2(ZnS∶SiO2=8∶2(质量比))构成的屏障层(厚度为50nm),制成了叠层体。屏障层的形成条件如下。
功率:4kw
压力:2×10-2hPa
时间:10秒
接着,通过旋转涂层法,在100至300rpm的转速下在所形成的屏障层上涂布UV固化粘接剂(日本油墨社制SD-661),并在其之上叠合聚碳酸酯薄膜(帝人社制bjuaeise、膜厚80μm),然后边把转速从300变化至4000rpm,边铺开粘接剂,最后通过紫外线照射灯照射紫外线,而固化粘接剂,制得实施例6至19的光信息记录介质。这时,粘接层的厚度为20μm,保护膜和粘接层的总厚度为100μm。
(对光信息记录介质的记录特性评价)
对得到的光信息记录介质进行与实施例1相同的试验,评价其记录特性。在表1中表示了其结果。
(实施例20至22)
在所述表1中所示的条件和Ar气氛下,通过DC溅射,在由注射成形聚碳酸酯树脂(帝人社制聚碳酸酯;商品名panlaidoAD5503)构成的衬底的具有厚度为1.1mm、外径为120mm、内径为15mm的螺旋状槽(槽深:40nm、槽宽:150nm、磁道间距:340nm)的面上形成由铝或铝合金构成的光反射层。另外,实施例24和25中,铝合金(Al-Ta、Al-Cr)中的Ta、Cr含量均为2at%。
然后,将欧腊索耳蓝-GN(cibafinechemical社制)2g与2,2,3,3-四氟丙醇100ml混合,超声波处理2小时进行溶解,制备色素涂布液。用旋转涂层法,边将转速从300变化至4000rpm,边在23℃、50%RH的条件下,在光反射层上涂敷所述色素涂敷液。形成的记录层的内槽厚度:100nm,上槽厚度:70nm。
然后在记录层上,通过RF溅射,形成由ZnS-SiO2(ZnS∶SiO2=8∶2(质量比))构成的屏障层(厚度为50nm),制成叠层体。屏障层的形成条件如下。
功率:4kw
压力:2×10-2hPa
时间:10秒
接着,通过旋转涂层法,以100至300rpm的转速,在形成的屏障层上涂布UV固化粘接剂(日本油墨社制SD-661),并在其上叠合聚碳酸酯薄膜(帝人社制bjuaeise、膜厚80μm),然后,边把转速从300改变至4000rpm边铺开粘接剂,最后通过紫外线照射灯照射紫外线,固化粘接剂,制得实施例20至22的光信息记录介质。这时,粘接层的厚度为20μm,保护膜和粘接层的总厚度为100μm。
(对光信息记录介质的记录特性评价)
对得到的光信息记录介质进行与实施例1相同的试验,评价其记录特性。在表1中表示了其结果。(比较例1)
把实施例1中的光反射层由铝替换成银(Ag)之外,与实施例1相同地制作比较例1的光信息记录介质。
对得到的光信息记录介质进行与实施例1相同的试验,评价其记录特性。在表1中表示了其结果。(比较例2)
把实施例1中的光反射层由铝替换成金(Au)之外,与实施例1相同地制作比较例1的光信息记录介质。
对得到的光信息记录介质进行与实施例1相同的试验,评价其记录特性。在表1中表示了其结果。
从表1的结果可以看出,实施例1至22的光信息记录介质因为使用铝或铝合金作为光反射层,所以表示记录特性的C/N或未记录噪声的评价结果均良好。特别是,Ar流量、溅射功率以及成模时间等光反射层的溅射条件均被控制在理想范围之内的光信息记录介质,其未记录噪声被控制得非常低,为小于10%,具有优异的记录特性。这大概是因为通过具有本发明的光反射层,由激光的照射得到的热能可以被有效地用于槽的形成。
另外,比较例1和比较例2的光信息记录介质与实施例1至22的光信息记录介质相比,C/N或未记录噪声的评价结果差。这大概是因为,由于在反射层中使用了热传导率高于铝或铝合金的Ag和Au,所以由激光的照射获得的热能由高热电导率,扩散,无法形成良好的槽的缘故。
根据本发明,通过使用由铝或铝合金构成的光反射层,可以提供一种成本降低,同时具有优异记录特性的光信息记录介质。

Claims (1)

1、一种光信息记录介质,在形成磁道间距为200~400nm、深度为10~150nm的槽的衬底上,依次设置光反射层、记录层和保护层,并从所述保护层侧照射波长小于500nm的激光而进行记录和再生,其特征在于,所述光反射层是由铝或铝合金构成。
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