CN1647174A - 光学数据存储媒质 - Google Patents

光学数据存储媒质 Download PDF

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CN1647174A
CN1647174A CNA038076160A CN03807616A CN1647174A CN 1647174 A CN1647174 A CN 1647174A CN A038076160 A CNA038076160 A CN A038076160A CN 03807616 A CN03807616 A CN 03807616A CN 1647174 A CN1647174 A CN 1647174A
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R·J·A·范登奥特拉亚尔
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Abstract

描述了一种利用聚焦辐射束(9)进行记录的光学数据存储媒质(20)。该聚焦辐射束通过第一塑料/树脂层(1)进入该媒质，该塑料/树脂层对于辐射束(9)是透明的。该媒质进一步至少包括：第一记录叠层(2)，其包括第一记录层，并邻近该第一塑料/树脂层，第二记录叠层(4)，包括第二记录层，所述第二记录叠层(4)距离第一塑料/树脂层(1)比距离第一记录叠层(2)更远，透明间隔层(3)，其位于第一和第二记录叠层之间，厚度大于聚焦辐射束的焦点深度。第一光学透明热屏蔽层(b1)置于第一记录叠层(2)和第一塑料/树脂层(1)之间，利用该屏蔽层，实现了该媒质不会或几乎不会受到由辐射束引起的第一塑料/树脂层中的应力双折射影响。双面型媒质包括第三和第四记录叠层以及第二光学透明热屏蔽层。

Description

光学数据存储媒质
本发明涉及一种光学数据存储媒质，其借助所聚焦的辐射束穿过对该辐射束透明的第一塑料/树脂层进入该媒质的方法来进行记录，所述媒质至少进一步包括：
第一记录叠层，其包括第一记录层，并邻近该第一塑料/树脂层，
第二记录叠层，其包括第二记录层，所述第二记录叠层距离第一塑料/树脂层比距离第一记录叠层更远，
第一和第二记录叠层之间的透明间隔层，其厚度大于聚焦辐射束的焦点深度。
从日本专利申请JP-11066622中可获知如开篇段落中所述的一种光学记录媒质的实施例。
近来，数字通用盘(DVD)作为一种数据存储量远大于致密盘(CD)的媒质已经获得了一定市场占有率。目前，这种格式可以用在只读(ROM)、可记录(R)和可重写(RW)类型中。对于可记录和可重写DVD而言，目前具有几种相互竞争的格式：对于可记录的有DVD+R、DVD-R，对于可重写的有DVD+RW、DVD-RW、DVD-RAM。对于可记录和可重写DVD格式，这二者都存在的问题是有限的容量以及由此引起的记录时间的问题，这是因为目前的单叠层媒质仅仅具有4.7GB的最大容量。要注意，对于ROM盘的DVD-视频，双层媒质具有8.5GB的容量，通常称作为DVD-9，已经具有了相当的市场占有率。因此十分需要具有8.5GB容量的可记录和可重写DVD盘。双层，如双叠层，可记录和/或可重写DVD盘是可能实现的。DVD-ROM标准规范描述了单叠层盘(A类型；数据容量＝4.7GB)以及双叠层盘(C类型；数据容量＝8.5GB)。此外还描述了双面类型的单叠层盘(B类型；数据容量＝9.4GB)和双面类型的双叠层盘(D类型；数据容量＝17.0GB)。可以和DVD-ROM标准相兼容的可记录(如一次性写入)和/或可重写媒质是十分需要的。最近提出了一种新的格式，称作蓝光盘(BD)，其具有更高的存储容量。这个系统利用波长约为405nm的辐射束并且具有较高的聚焦辐射束数值孔径(NA)。对于这种格式也将引入一次性写入(R)和可重写(RW)类型，以及考虑到双层BD类型。
为了存取双层DVD+R、双层DVD+R+RW或双层DVD+R-ROM光学存储媒质的第二记录叠层，也称作记录叠层L1(参见图1中的附图标记4)，必须使辐射束通过三个层聚焦到叠层L1的记录层上，这三个层即上部聚碳酸脂衬底，第一记录叠层，也称作记录叠层L0，和间隔层(分别参见图1中的附图标记1、2和3)。这三个层任一的内部或者其界面处的光扰动会使光学记录信号变差，甚至可能阻碍在层L1上的读取或写入。在已知的媒质中，在L0上写入的过程中，染料层L0中的吸热量可以引起衬底-染料界面附近的聚碳酸脂中的应力，从而引起上部衬底(即第一塑料或树脂层)中的应力双折射，也称作机械双折射或光致弹性。在上部聚碳酸脂衬底中所引起的双折射会阻碍在下部层L1上获得足够小的聚焦激光光点，并且还将不利地影响到从层L1反射的激光束。
单叠层DVD+R媒质，以及类似的CD-R媒质很少受到上述问题的影响，这是因为在衬底-染料界面处的聚碳酸脂中所引起的应力双折射是在辐射束的焦点附近，而在双层媒质中，当辐射束聚焦到层L1上时，在受影响的聚碳酸脂区域处(具有应力双折射)，辐射束完全没有对准焦点。
本发明的目的是提供一种开篇段落中所述类型的光学数据存储媒质，其不会或者几乎不会受到辐射束引起的第一塑料/树脂层中的应力双折射的影响。
这个目的是通过如开篇段落中所述的光学存储媒质来实现的，其特征在于第一光学透明热屏蔽层置于第一记录叠层和第一塑料/树脂层之间。
提出将第一记录叠层(即上部L0可记录叠层)和第一塑料/树脂层(例如上部聚碳酸脂衬底)之间的第一热屏蔽层用于单面和双面的双层DVD+R、DVD+R+RW和DVD+R-ROM光学存储媒质中。该热屏蔽层将消除写入上部L0层时的上部聚碳酸脂衬底中的应力双折射，从而提供了在下部L1层的最佳光学存取。
优选第一记录层是一次性写入层，第二记录层是从一次性写入层、可重写层和只读层中选取的一种。后者在制作母盘过程中已经进行了记录。这种一次性写入层的优点在于可以获得较高的第一记录叠层的透射率。这种高透射率可以使该光学存储媒质的第一和第二记录叠层都具有大于18％的有效光反射率，这是DVD只读标准的要求之一。
优选的是，第一热屏蔽层由具有低热传导率的材料制成，例如小于1W/mK。该材料对于聚焦辐射束的波长为λ的辐射束(例如对于DVD，λ＝655nm)应是光学透明的，即光学吸收参数k应为零或者接近于零，例如＜＜0.01。该材料优选具有低机械应力并具有足够厚度，优选为1-500nm范围内，更为优选的是5-50nm范围内，由此降低了屏蔽层-衬底界面处的温度以防止第一塑料/树脂层(例如由聚碳酸酯材料制成)的机械变形。适用于热屏蔽层的材料是例如ZnS-SiO2，氧氮化硅和二氧化硅。
热屏蔽层也有助于增加上部L0叠层的记录敏感度。因为L0叠层具有使足够的辐射束到达下部L1叠层所需的高透射率，因此当在L0上进行记录时必须有效地利用辐射束的能量。热屏蔽层将减少泄漏到上部塑料/树脂衬底的热量，从而使L0可记录叠层更加敏感。
在另一实施例中，该光学数据存储媒质进一步包括：
-第二塑料/树脂层，与第一塑料/树脂层相对，其对于辐射束是透明的，
-第三记录叠层，其包括第三记录层，并邻近第二塑料/树脂层，
-第四记录叠层，包括第四记录层，所述第四记录叠层距离第二塑料/树脂层比距离第三记录叠层更远，
-透明间隔层，其位于第三和第四记录叠层之间，其厚度大于聚焦辐射束的焦点深度，
-第二光学透明热屏蔽层，其置于第三记录叠层和第二塑料/树脂层之间。以这种方式获得了双面光学记录媒质，其具有单面媒质两倍的数据存储容量。
将参照相应附图对本发明进行更详细的说明，其中
图1示出了根据现有技术的双叠层光学数据存储媒质的实施例的示意图，
图2示出了根据本发明的双叠层光学数据存储媒质的实施例的示意图，
图3示出了根据本发明的双面双叠层光学数据存储媒质的另一实施例的示意图。
比较实例(现有技术)：
在图1中表示了根据现有技术的光学数据存储媒质10，其利用聚焦辐射束9来进行记录。该辐射束9的波长为655nm，其通过由聚碳酸酯制成并且对该辐射束9是透明的第一塑料/树脂层1进入媒质10。该媒质进一步包括邻近第一塑料/树脂层的第一记录叠层2，其包括第一记录层，以及第二记录叠层，其包括第二记录层，所述第二记录叠层4距离第一塑料/树脂层1比距离第一记录叠层1更远。透明间隔层3位于第一和第二记录叠层之间，其厚度为40到70μm之间，大于聚焦辐射束的焦点深度。第一和第二记录层是偶氮染料层。第一和第二记录叠层进一步分别包括反射层，例如10nmAg制成的薄半透明金属层和100nmAg制成的相对厚的金属层。
实例(根据本发明)：
在图2中表示了一种光学数据存储媒质20，其中，根据本发明，将位于第一记录叠层2和第一塑料/树脂层1之间的第一光学透明热屏蔽层b1添加到参照图1所述的光学数据存储媒质10中。热屏蔽层b1是通过诸如溅射来沉积的，主要包括SiO2并且厚度为20nm。第一塑料/树脂层1是由聚碳酸酯制成的衬底，具有伺服预制槽图案并且厚度在550-600μm范围内。在记录和/或读取期间，该伺服预制槽用于引导聚焦辐射束9。第一记录叠层2是一次性写入叠层，包括由花青染料或偶氮染料制成的第一记录层(n＝2.2；k＝0.02)，其厚度为80nm。该染料可以通过旋涂涂敷或蒸发来沉积。在第一记录层和间隔层3之间存在具有8nm厚度的由Au制成的半透明反射层(n＝0.28；k＝3.9)，并通过诸如溅射来沉积。透明间隔层3由UV可固化树脂或压敏粘合剂(PSA)制成(n＝1.5)，厚度为40-70μm。该第二记录叠层4依次包括：由ZnS/SiO2(80∶20)制成的第一介电层(n＝2.15)，厚度为135nm，并通过溅射来沉积，由相变GeInSbTe合金制成的可重写记录层(结晶度：n＝2.9；k＝4.8)，厚度为12nm，并通过溅射来沉积，由ZnS/SiO2(80∶20)制成的第二介电层(n＝2.15)，厚度为23nm，并通过溅射来沉积，由Al制成的反射层(n＝1.97；k＝7.83)，厚度为100nm，并通过溅射来沉积。邻近该第二记录叠层4具有另一个衬底5，其由聚碳酸酯(n＝1.58)制成，厚度在550-650μm范围内。该另一个衬底5在与第二记录叠层4相邻的一侧表面上具有伺服预制槽或引导槽图案。在另一实施例中，伺服预制槽或引导槽图案位于透明间隔层3的与第二记录叠层4相邻的一侧上。该第二记录叠层4依次包括：由花青染料或偶氮染料制成的一次性写入记录层(n＝2.2；k＝0.02)，厚度为80nm，以及由Ag制成的反射层(n＝0.28；k＝3.8)，厚度为100nm，通过溅射来沉积而成。
在图3中表示了根据本发明的双面双叠层光学数据存储媒质30，该媒质与D型DVD-ROM标准相兼容。附图标记1，2，3，4和b1对应于图2的说明。该由UV可固化树脂制成的第一透明间隔层3，在第二记录叠层4一侧的表面上具有伺服预制槽或引导槽图案。图2中的另一个衬底5由耦合层6取代。
该媒质30进一步包括：
-第二塑料/树脂层1’，与第一塑料/树脂层1相对，其对于辐射束9是透明的，
-第三记录叠层2’，其包括第三记录层，并邻近第二塑料/树脂层1’，
-第四记录叠层4’，包括第四记录层，所述第四记录叠层4’距离第二塑料/树脂层1’比距离第三记录叠层2’更远，
-第二透明间隔层3’，厚度在40-70μm范围内，其位于第三和第四记录叠层之间，
-第二光学透明热屏蔽层b2，其置于第三记录叠层2’和第二塑料/树脂层1’之间。
该层和叠层1’，2’，3’，4’和b2分别与层和叠层1，2，3，4和b2相一致。因此双面双叠层媒质在借助耦合层6结合在一起的两面上都具有相同的设计，其可以是厚度为20-300μm的PSA。根据衬底1和1’以及间隔层3和3’的厚度，可以调整该耦合层6的厚度以使得该媒质30的总厚度不超过具体的DVD盘标准中的最大厚度，如1500μm。然而，为了防止在用于在记录层中读取和写入的聚焦辐射束9中出现过多的光学像差，同样需要限制该衬底的厚度范围。
第二记录叠层4和第四记录叠层4’的预制槽(或引导槽)也可以出现在耦合层6中，在这种情况下，该耦合层可以构成在两面上具有预制槽的塑料片。这样，间隔层3和3’可以构成不具有预制槽的UV可固化树脂或者压敏粘合剂(PSA)。
应当注意，上述实施例是举例说明而不是限制本发明，本领域技术人员将能在不背离所附权利要求范围的情况下，设计出许多可选实施例。在权利要求中，置于括号中的任何附图标记不应解释为对权利要求的限制。词语“包括”不排除不同于权利要求中列出的元件或步骤的存在。元件前的词语“一个”或“一种”不排除多个这种元件的可能性。起码的事实是：在相互不同的从属权利要求中表述了某些方法，不表示使用这些方法的组合不是有利的。
根据本发明，描述了利用聚焦辐射束进行记录的光学数据存储媒质。光束通过对辐射束是透明的第一塑料/树脂层进入该媒质。该媒质进一步至少包括：第一记录叠层，其包括第一记录层，并邻近第一塑料/树脂层；第二记录叠层，包括第二记录层，所述第二记录叠层距离第一塑料/树脂层比距离第一记录叠层更远；还包括位于第一和第二记录叠层之间的透明间隔层，其厚度大于聚焦辐射束的焦点深度。第一光学透明热屏蔽层置于第一记录叠层和第一塑料/树脂层之间，利用该屏蔽层，实现了该媒质不会或几乎不会受到由辐射束引起的第一塑料/树脂层中的应力双折射影响。双面型媒质包括第三和第四记录叠层以及第二光学透明热屏蔽层。

Claims (8)

1.一种光学数据存储媒质(20)，其借助聚焦的辐射束(9)穿过对该辐射束(9)透明的第一塑料/树脂层(1)进入该媒质的方法来进行记录，所述媒质还至少包括：
-第一记录叠层(2)，其包括第一记录层，并邻近该第一塑料/树脂层，
-第二记录叠层(4)，其包括第二记录层，所述第二记录叠层(4)距离第一塑料/树脂层(1)比距离第一记录叠层(2)更远，
-透明间隔层(3)，其位于第一和第二记录叠层之间，具有大于聚焦辐射束的焦点深度的厚度，
其特征在于，第一光学透明热屏蔽层(b1)置于第一记录叠层和第一塑料/树脂层之间。
2.根据权利要求1所述的光学数据存储媒质(20)，其中第一记录层是一次性写入层，第二记录层是从一次性写入层、可重写层和只读层中选出的一种。
3.根据权利要求1或2所述的光学数据存储媒质(20)，其中该热屏蔽层对于波长为λ的聚焦辐射束的光学吸收率为k＜＜0.01。
4.根据权利要求1-3中任一项所述的双叠层光学数据存储媒质(20)，其中该热屏蔽层的热传导率小于1W/mK。
5.根据权利要求1-4中任一项所述的光学数据存储媒质(20)，其中该热屏蔽层的厚度在1-500nm范围内。
6.根据权利要求5所述的光学数据存储媒质(20)，其中该热屏蔽层的厚度在5-50nm范围内。
7.根据权利要求1-6中任一项所述的光学数据存储媒质(20)，其中该热屏蔽层主要包括从ZnS-SiO2、氧氮化硅和二氧化硅中选出的一种材料。
8.根据权利要求1-7中任一项所述的光学数据存储媒质(30)，其中该媒质还至少包括：
-第二塑料/树脂层(1’)，与第一塑料/树脂层(1)相对，其对于辐射束(9)是透明的，
-第三记录叠层(2’)，其包括第三记录层，并邻近第二塑料/树脂层，
-第四记录叠层(4’)，包括第四记录层，所述第四记录叠层距离第二塑料/树脂层(1’)比距离第三记录叠层(2’)更远，
-透明间隔层(3’)，其位于第三和第四记录叠层之间，并具有大于聚焦辐射束的焦点深度的厚度，
-第二光学透明热屏蔽层(b2)，其置于第三记录叠层和第二塑料/树脂层之间。
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