CN1732523A - 可重写式光学记录载体 - Google Patents
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Abstract
一种可重写式光学记录载体，其包括承载第一记录叠层的第一基板，该记录叠层包括：第一介电层、包括相变记录材料的记录层、第二介电层、和金属镜面层。为了实现最大的R＊M，所述第一介电层具有20nm～50nm的厚度d1，并且当镜面层包括铝时，所述第二介电层具有根据下列关系的厚度d2，即，0.0225＊d2 2－2.6572＊d2+173.3(nm)＜d1＜0.0225＊d2 2－2.6572＊d2+213.3(nm)；当镜面层包括银时，所述第二介电层具有根据下列关系的厚度d2，即0.0191＊d2 2－2.0482＊d2+149.6(nm)＜d1＜0.0191＊d2 2－2.0482＊d2+189.6(nm)。
Description
技术领域
本发明涉及一种可重写式光学记录载体，包括承载记录叠层(IPIM)的基板，该记录叠层按照这样的顺序包括：第一介电层(I1)；包括相变记录材料(PC)的记录层(P)；第二介电层(I2)；和镜面层(M)，其由包括铝作为主要成分的混合物构成，或者由包括银作为主要成分的混合物构成。本发明进一步涉及具有包括相反顺序的所述层的记录叠层(MIPI)的这种可重写式光学记录载体。
背景技术
在所有已知可重写式光学记录介质中，诸如CD-RW、DVD-RAM、DVD-RW、DVD+RW和Blu-Ray盘片(BD)，使用了包括该相变记录层的记录叠层。该PC层通常夹在两个ZnS-SiO2介电层之间的叠层中。目前，用于可擦写相变记录的介质选择为具有耐久性多晶结构的合金，例如，由Sb和Te加上In、Ge和/或Ag构成的合金。该记录叠层的一侧上安置了镜面层，其典型地由金属制成，诸如金、银或铝。对于其另一侧，该记录叠层安置在基板上，诸如聚碳酸酯基板。从基板侧进入记录介质的根据记录信号进行调制的写激光束聚焦在记录叠层上。当盘片相对于聚焦激光束移动时，后者主要由记录层吸收。由此，局部加热了合金。当温度超过其熔点(约500℃～700℃)时，相变材料转化为非晶态。通过相邻介电层的快速散热引发了合金的快速冷却，由此稳定了非晶相。因此，写入标记沿光轨保留。使用具有减小的功率的激光束允许擦除写入标记。由此，记录层被加热到约200℃的温度，致使相态变回多晶相(退火)。由于原子必须保持在高温足够长的时间以重新结晶，因此结晶是相当缓慢的过程，尽管PC介质中的非晶化可以是非常迅速的。
尽管叠层在处于多晶相态(基态)时具有高的反射率，但是处于非晶相态(写入状态)时反射率减小。因此，聚焦在所述记录叠层上的读光束，依赖于其刺射到写入标记(凹点)还是未写入区域(平台)，由记录层反射，且具有不同强度。这样，介电层和反射层执行数个任务：保护记录层；创建光学已调结构，其具有最优化的反射率和/或吸收率；允许配合盘片的热属性，用于迅速冷却。
例如，由于多媒体应用中待提供的数据量的爆炸性增长，可重写式光学记录载体以及记录介质通常已经历了数据容量的进化式的增长。可重写式光学记录载体的数据容量从650MB(CD，NA＝0.45、λ＝780nm)发展到4.7GB(DVD、NA＝0.65、λ＝650nm)，并且最终向25GB(B1u-Ray盘片(BD)，NA＝0.85、λ＝405nm)发展。通过增加每张盘片的记录叠层数目，可以使数据容量进一步倍增。所谓的双记录层叠层设计对于DVD-ROM是已知的。其中，两个记录层配置在叠层中，在同一基板上在两个记录层之间具有隔层。这类盘片中的记录层易于受到相同的影响。
然而，由于激光在可重写式记录载体中的显著吸收，该介质中的双记录层叠层上的信息记录和读出是较为困难的。即使在大量的激光束的功率已由第一记录叠层(L0)吸收之后，该激光束仍须足够强以在第二记录叠层(L1)上写入，其中第二记录叠层(L1)是相对于入射激光束的传播方向的最远的记录叠层，而第一记录叠层(L0)是相对于入射激光束的传播方向的最近的记录叠层。因此，就目前而言，该多层叠层未专用于可重写式光学记录载体。
同对数据容量的增长的需要相似，对相变光学记录中的高数据率的需要也在增长。高的数据率需要记录层具有高的结晶速率，即，短的结晶时间。为了确保先前的记录标记可在直接覆写(DOW)过程中重新结晶，例如，如上文提及的，记录层应具有适当的结晶时间，用以同自旋记录载体相对于激光束的线性速度匹配。如果结晶速度未足够高到可同线性速度匹配，则来自先前记录的旧的数据(非晶标记)不能被完全擦除。保留的旧的数据片段将导致高的噪声水平。
近来，在US 2001 0036527中，在US 2001 00365278、WO 01/13370中，提出了这样的可重写式光学记录介质，其具有充分的记录属性，即使在高的线性速度下，满足由DVD标准预先确定的光学范围，诸如抖动、光学对比度和调制。然而，此外，这些记录载体包括具有40％～60％透射率的L0记录叠层。由于到达L1的激光功率减少很多，使得L1记录叠层必须是非常灵敏的，特别是在高的线性速度下。另一方面，由于在第二记录叠层L1处反射的读激光束的光在其通过L0叠层返回检测器的路程中将再一次衰减，因此L1叠层须具有非常高的反射率。
发明内容
因此，本发明的目的在于提供一种具有叠层设计的可重写式光学记录载体，其提供了关于灵敏度和反射率的较好的光学属性。
根据本发明，该目的是通过如起始章节中所描述的具有记录叠层的可重写式光学记录载体实现的，该记录叠层按照所述顺序(IPIM)包括所述层，其特征在于，所述第一介电层具有100nm～200nm范围内的厚度d1，并且当镜面层包括铝时，所述第二介电层具有根据下列关系的厚度d2，
0.0225*d2 2-2.6572*d2+173.3(nm)＜d1＜0.0225*d2 2-2.6572*d2+213.3(nm)(1)
当镜面层包括银时，所述第二介电层具有根据下列关系的厚度d2。
0.0191*d2 2-2.0482*d2+149.6(nm)＜d1＜0.0191*d2 2-2.0482*d2+189.6(nm)(2)
根据本发明的第二方面，该目的是通过如起始章节中所描述的具有记录叠层的可重写式光学记录载体实现的，该记录叠层按照相反顺序(MIPI)包括所述层，其特征在于，所述第一介电层I1具有100nm～200nm范围内的厚度d1，并且当镜面层包括铝时，所述第二介电层I2具有根据关系(1)的厚度d2，当镜面层包括银时，所述第二介电层I2具有根据关系(2)的厚度d2。
根据第三方面，其构成了本发明的第一或第二方面的进一步的发展方案，所述第二介电层I2具有20nm～50nm范围内的厚度。
根据第四方面，其构成了本发明的第一或第二方面的进一步的发展方案，所述第一介电层I1具有110nm～150nm范围内的厚度，并且所述第二介电层I2具有25nm～40nm范围内的厚度。
尽管早先提出的用于可重写式光学记录载体中的记录叠层的发展方案集中于高的光学对比度，但是根据本发明的可重写式光学记录载体包括针对最大值R*M进行优化的记录叠层，该最大值R*M对应于结晶反射(Rc)减去非晶反射(Ra)，因此其也被称为Rc-Ra。如将由下面的示例所看到的，这导致了更高的反射率。而且，可以增加灵敏度，即所需用于写入标记的激光功率。
附图说明
下面，通过结合附图对本发明的优选实施例的描述，本发明的上述和其他的目的、特征和优点将变得显而易见，在附图中：
图1示出了普通的可重写式光学记录载体的剖面视图；
图2说明了根据本发明优选实施例的可重写式光学记录载体的剖面视图；
图3示出了包括导致了最大的Rc-Ra的铝镜面层的根据本发明的记录叠层的I1层厚度和I2层厚度的组合；
图4示出了包括导致了最大的Rc-Ra的银镜面层的根据本发明的记录叠层的I1层厚度和I2层厚度的组合；
图5示出了反射信号Rc、Ra、差Rc-Ra、和反射读光束的光学对比度作为I2厚度的函数；
图6示出了反射信号Rc、Ra、Rc-Ra的差、和反射读光束的光学对比度作为I1厚度的函数；
图7示出了根据本发明的包括单个记录叠层的可重写式光学记录载体依赖于写功率的抖动和调制；
图8示出了根据本发明的包括两个记录叠层的可重写式光学记录载体依赖于写功率的抖动和调制。
具体实施方式
如图1所示的当前的可重写式光学记录载体10包括单个记录叠层101，其固定地安置到所谓的虚设叠层或虚设基板102上。这里，所有关于层位置和/或方向及其配置的声明均与由箭头110标出的入射激光束的方向相关。还被记为L0的上面的单一记录叠层101是与光束的进入表面最接近的叠层。如上文所概述的，已知的记录叠层考虑到其反射率和灵敏度而不适于用于下方的叠层L1中。由于少量的光透射通过顶层101，因此它们不具有足够用于记录的灵敏度，而且反射率过小从而不能在第二级中读取信息。因此，虚设叠层102仅由聚碳酸酯制成。虚设叠层102和记录叠层101通常通过粘合剂层和隔层(未示出)固定。记录叠层101包括聚碳酸酯基板103，在其顶上层叠了第一介电层104。该层103由ZnS和SiO2的混合物，例如(ZnS)80(SiO2)20制成，并且具有60nm～85nm范围内的厚度。下一个下方的层是记录层105，其由例如GeInSbTe制成，具有12nm～18nm范围内的厚度。在所述第一介电层104的相对侧上贴附于记录层105时，可以发现第二介电层106同样由ZnS-SiO2制成，具有12nm～20nm的厚度。属于L0叠层的最下面的层是金属镜面层107，其通常由银或金制成。记录叠层101的所有层是按照上文列出的顺序而顺序地溅射层叠的，由此形成了IPIM叠层。
如在图2中可以看到的，根据本发明的可重写式光学记录载体20包括记录叠层201作为关于由箭头210标出的入射激光束的方向的第二叠层L1。在L1叠层的顶部，可以淀积第一透明记录叠层L0 202，在两个叠层201和202之间具有隔层(未示出)。该透明记录叠层典型地具有在40％～60％之间的透射率。如后面所将看到的，除了已知记录叠层以外的根据本发明的L1记录叠层201，由于其高的反射率和灵敏度，优选地适用于在该条件下进行记录。
L1记录叠层201自上而下包括：第一(ZnS)80(SiO2)20介电层203，还被称为I1，其厚度在100nm～200nm之间，优选地在120nm～160nm之间；另一记录层204，例如由GeInSbTe制成，具有12nm±1.5nm范围内的厚度。第二介电(ZnS)80(SiO2)20层205与第一介电层203相对地同所述记录层204相邻，还被称为I2，其厚度在20nm～50nm之间，优选地在25nm～40nm之间。在其下方配置了镜面层206。其由金属或金属合金制成，优选地是铝、Al同一定百分比的Ti或金的混合物。该镜面层典型地约为50nm厚。最后，L1记录叠层201的底层是基板207，其例如由聚碳酸酯制成。上述各层，即第一介电层203、记录层204、第二介电层205和镜面层206的配置按照同编号相反的顺序层叠在所述基板207上，由此形成了MIPI叠层。
通常用于光学记录载体的记录叠层未针对最大反射、特别是针对最大反射差R*M(＝Rc-Ra，结晶反射Rc减去非晶反射Ra)进行优化。这在图3和4中得到说明，其中实线301、401分别表示图3的关于包括铝镜面层的记录叠层的反射差的最大值和图4的关于包括银镜面层的记录叠层的反射差的最大值。根据本发明的记录叠层的I1层的厚度和I2层的厚度的组合应分别沿这些最大值Rc-Ra线301、401进行选择，其可以记录为下式，其中d1表示I1层厚度，而d2表示I2层厚度：
a)对于包括铝镜面层的反射体叠层
0.0225*d2 2-2.6572*d2+173.3(nm)＜d1＜0.0225*d2 2-2.6572*d2+213.3(nm)
b)对于包括银镜面层的反射体叠层
0.0191*d2 2-2.0482*d2+149.6(nm)＜d1＜0.0191*d2 2-2.0482*d2+189.6(nm)
由于普通可重写式DVD中的I1层厚度在60nm～85nm的范围内，因此R*M远离最优值。特别地，由于优选用于该类盘片的第二介电层的厚度在12nm～20nm的范围内，其中甚至需要更高的I1厚度，因此R*M很小。
根据本发明的有利实施例，与高反射率和灵敏度相关的I2层的厚度选择为，对于包括铝镜面层的记录叠层约28nm，对于包括银镜面层的记录叠层约25nm。这样，与高的R*M值相关的相应I1层的厚度分别选择为约135nm和130nm。然而，考虑到其他的参数，诸如灵敏度、调制或者光学对比度，可以不同地选择I1层的厚度，但是其应当保持在正负20nm的范围内，该范围在图3和4中分别由虚线302、402和点线303、403标出。
而且，介电层I2 205由于相比于普通的I2介电层的其增加的厚度，因此具有较高的热阻，参看图1和2。这样，减少了从相变层204到镜面层206的热传输。由于镜面层用作散热器，因此需要较少的激光功率用于将相变材料加热到其熔点。这样，获得了根据本发明的记录叠层的较高的灵敏度。
根据多个有利的实施例，从记录载体中的第二记录叠层L1的RTM测量所得出的结果在图5和6中示出。根据该实施例，PC层具有12nm的厚度。然而，其可以在±1.5nm的范围中选择，其中所述Rc和Ra值几乎不变。但是，记录PC材料的结晶和非晶(结构)状态之间的光学相位差别在该范围中发生显著地变化。可以利用该属性用于优化推挽变化(push-pull variation)。用于该实验的镜面层为50nm厚，其由添加了1.5％的Ti的Al的混合物构成。在图5中，聚焦的反射信号Rc、Ra、两者的差Rc-Ra、以及光学对比度被示为I2层厚度的函数。由此，I1层的厚度适用于考虑最大的R*M值，参看图3。在图6中，相应的结果被示为I1层厚度的函数，由此I2层的厚度被固定为28nm。
结晶相Rc的反射(菱形符号)以及非晶相Ra的反射(正方形符号)随着增加的I2厚度而下降，参看图5，并且，相应地，在选择较厚的I1层时增加，参看图6。可以从图6中看出，135nm厚度的I1层导致了最大的R*M，即最大的Rc-Ra(三角形符号)。根据图3，该值对应于约28nm的I2值。借助于此，R*M可以增加高达33％甚至更高，然而，正常生产的盘片仅具有25％。作为归一化的反射值的对比度(交叉符号)，即Rc-Ra除以结晶相反射Rc，由于迅速增长的结晶相反射Rc而在该区域中下降到80％的值。
根据具有单个的记录MIPI叠层L1的另一有利的实施例，调制和抖动对于光盘中激光束的写功率的依赖关系在图7中示出，由此，激光束通过作为L0叠层的聚碳酸酯虚设层聚焦在L1记录叠层上。在如本发明所提出的双记录叠层盘片中，对于写功率的相同的依赖关系在图8中示出，由此激光束通过具有约45％的透射率的IPIM记录叠层L0聚焦在MIPI记录叠层L1上。两种记录载体中的L1叠层的结构如下：
一第一介电层：ZnS-SiO2，130nm
-PC记录层：GeInSbTe，12nm
-第二介电层：ZnS-SiO2，32nm
-镜面层：AlTi，50nm
通过关于具有单层设置以及具有双层设置的L1叠层的两个记录实验，发现I2厚度应在20nm～40nm的范围内，以便于获得正确的灵敏度。否则，如果低于该范围，则所需用于记录的写功率变高。如果高于该范围，则将出现重复写的问题。
而且，图7示出了当盘片包括仅具有顶部的透明虚设层的单个L1记录叠层时，约12mW的低写功率足够用于写操作，由此，获得了45％或更大的调制，以及少于10％的最小抖动。由于所提出的叠层如此灵敏，因此其也可用于双层盘片作为L1叠层中，参看图8。采用仍然合理的少于30mW的写功率，在该双记录叠层设置中获得了低的抖动和好的调制。
应当注意，本发明不限于上文的优选实施例。还可以使用其他的记录层材料、介电层材料、基板材料和/或反射层材料。而且，本发明不限于如此处上文所述的具有双记录叠层设置的光学记录载体。还可以提供IPIM类型的更兼容的单层光学记录载体，其具有根据图2的单记录层叠层，该单记录层叠层具有同此处上文所述相同的光学属性和层厚度，但是其是作为L0层淀积到虚设层上的。而且，还可以提供多记录叠层的设计，其具有多于两个的具有根据本发明的光学属性的记录层。
Claims (7)
1.一种可重写式光学记录载体，包括承载第一记录叠层的基板，该第一记录叠层按照这样的顺序或相反的顺序包括：
-第一介电层；
-包括相变记录材料的记录层；
-第二介电层；和
-镜面层，其由包括铝作为主要成分的混合物构成，或者由包括银作为主要成分的混合物构成，
其特征在于，所述第一介电层具有100nm～200nm范围内的厚度d1，并且所述第二介电层具有根据下列关系其中之一的厚度d2，
a)当镜面层包括铝时，
0.0225*d2 2-2.6572*d2+173.3(nm)＜d1＜0.0225*d2 2-2.6572*d2+213.3(nm)
b)当镜面层包括银时，
0.0191*d2 2-2.0482*d2+149.6(nm)＜d1＜0.0191*d2 2-2.0482*d2+189.6(nm).
2.权利要求1的可重写式光学记录载体，其特征在于，所述第二介电层具有20nm～50nm范围内的厚度。
3.权利要求2的可重写式光学记录载体，其特征在于，所述第一介电层具有110nm～150nm范围内的厚度，并且所述第二介电层具有25nm～40nm范围内的厚度。
4.权利要求3的可重写式光学记录载体，其特征在于，所述第一和第二介电层包括ZnS和SiO2的混合物。
5.权利要求4的可重写式光学记录载体，其特征在于，所述相变记录材料包括Ge、In、Sb和Te的混合物，并且所述记录层具有12±1.5nm范围内的厚度。
6.权利要求1～5其中任一的可重写式光学记录载体，其特征在于，其进一步包括：
-贴附于所述第一介电层的隔层，和
-淀积在所述隔层上的第二记录叠层。
7.权利要求1～5其中任一的可重写式光学记录载体，其特征在于，其进一步包括安置到第一介电层上的虚设基板。
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