CN100416682C - 光学信息媒体 - Google Patents
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Abstract
根据本发明提供了一种用于记录的光学信息媒体(20)比如DVR-蓝和制造这种媒体(20)的方法。通过波长为λ和数值孔径为NA的聚焦辐射束(10)执行从媒体(20)中读取和记录到媒体中。所说的媒体具有衬底(1)和在该衬底上提供的层的层叠(2)。该层叠(2)包括至少一第一记录层叠(3)和k个辐射束透射层(4,5)。每个辐射束透射层(4,5)具有折射率ni和平均厚度di微米,并且1=i=k,且k=2。根据参数ni(i=1…k)和di(i=1…k-1)通过简单的公式确定层k(5)的厚度dk。这种媒体(20)在所说的辐射束(10)的处于第一记录层叠(3)的记录层上的焦点上具有为零或基本为零的球面像差。
Description
本申请是申请号为01807089.2、申请日为2001年12月20日、发明名称为“光学信息媒体和制造该媒体的方法”的申请的分案申请。
技术领域
本发明涉及一种通过具有辐射波长λ和数值孔径NA的聚焦辐射束进行记录的光学信息媒体,所说的媒体具有衬底和在该衬底上提供的层的层叠,该层叠包括至少一第一记录层叠和k个辐射束透射层,每个辐射束透射层具有折射率ni和平均厚度di微米,并且1≤i≤k和k≥2。
本发明进一步涉及一种制造这种光学信息媒体的方法。
背景技术
欧洲专利申请EP-A-1047055中公开了这样的光学信息媒体的实施例。具体地说,描述了为将覆盖层或其它的层彼此粘接在衬底的表面和/或一个或多个信息存储层上光透射粘接剂层的应用。
已有实现适合于记录和再现的光学存储媒体的恒速驱动器,这种光学媒体具有8千兆字节(GB)或更大的容量。通过某些数字视频盘或有时也称数字化视频光盘(DVD)格式满足这些要求。DVD格式可以分为专用于再现的DVD-ROM、也可用于可重写的数据存储器的DVD-RAM、DVD-RW和DVD+RW和可记录一次的DVD-R。当前的DVD格式包括容量为4.7GB、8.5GB、9.4GB和17GB的盘。
8.5GB尤其是9.4GB和17GB格式具有更复杂的结构,通常包括多个信息存储层。4.7GB的单层可重写的DVD格式比例如常规的CD(光盘)容易处理,但用于视频记录的目的则存储容量不够。
最近已经提出的高存储容量格式是数字视频可记录盘(DVR)。当前开发了两种格式:红DVR和DVR-蓝,这里红和蓝是指用于记录和读取而使用的辐射束波长。这种盘以最简单的形式克服了客量的问题,具有适合于高密度的数字视频记录的单存储层格式,并且在DVR-蓝格式中存储容量高达22GB。
DVR盘通常包括在一个或两个表面上具有信息存储层的盘形衬底。DVR盘进一步包括一个或多个辐射束透射层。这些层透射用于读或写盘的辐射束。例如,应用在信息存储层上的透射保护层。通常,对于较高密度的盘,使用具有较高数值孔径(NA)(例如高于0.60)的透镜对这种具有相对较低的波长的辐射束进行聚焦。对于高于0.6的NA的系统,由于降低了例如厚度变化和盘倾斜的公差,以厚度在0.6-1.2毫米范围的衬底应用衬底入射记录变得更加困难。为此,在使用以较高的NA读取和记录的盘时,从与衬底相对的侧面执行在第一记录层叠的记录层上的聚焦。因为必需保护第一记录层不受环境的影响,所以使用至少一个相对较薄的辐射束透射覆盖层,例如薄于0.5毫米,通过这种覆盖层对辐射束进行聚焦。很显然,不再需要对辐射束透射的衬底,而是可以使用其它的衬底材料比如金属或它的合金。
在存在第二或另外的记录层叠的情况下,在记录层叠之间要求辐射束透射的间隔层。第二和进一步记录层叠必需至少部分地对辐射束波长透明以便能够从第一记录层叠的记录层中进行读和写。这种间隔层的厚度通常从几十微米起。在辐射束源和距衬底最远的记录层叠之间存在的辐射束透射层通常称为覆盖层。在预制的薄片用作透射层时,要求附加的透射粘接层以彼此粘接覆盖层。
在DVR盘中必需非常仔细地控制在盘的径向延伸上辐射束的透射层的厚度的变化或不均匀度以使撞击的辐射的光路长度变化最小。特别是在DVR-蓝版中在焦点上的辐射束的光学质量对透射层的厚度的变化相对敏感,这种DVR-蓝版使用具有波长基本等于405纳米和NA基本等于0.85的辐射束。总的层的厚度具有最佳的值以在例如第一信息记录层上获得聚焦辐射束最小的光学球面像差。偏离这种最佳厚度的轻微偏差(例如+/-2微米)引起了相当大的这种像差。由于这种小范围偏差的缘故,透射层的平均厚度等于或接近它的最佳厚度非常重要以最佳地使用该系统的公差,并在制造该盘的过程中具有较高的产出率。假设厚度误差是分布在厚度的标称设置的周围的高斯函数,很显然,在制造的过程中在标称厚度的目标设置基本等于在DVR盘的技术规范中的覆盖层的最佳厚度时,所制造的不符合上述规范的盘的数量最少。在覆盖层的折射率n=1.6时DVR盘的单个覆盖层的标称厚度为100微米。在使用不同的折射率时必需调整覆盖层的标称厚度。由于最佳的厚度的变化可以超过一个微米,显然从产出率的角度看即使这种小的变化也必需考虑。由于读和写系统的较高的数值孔径,在折射率不同时,通过例如应用三阶Seidel像差分析不能精确地预计最佳的覆盖层厚度的这种变化。因此必需使用更高阶的分析或射线跟踪方法。将D(n)定义为作为折射率函数的覆盖层的最佳厚度,因此对于所提出的厚度,D(1.6)=100微米。由于这是一个参数的函数,因此它必需计算一次,并以单曲线图给出。在考虑多个透明层的盘时问题出现了。正如前文所述,使用多层盘以允许例如双层读出。此外,从EP-A-1047055中可以得知使用聚合物层比如聚碳酸酯(PC)薄片作为光透射覆盖层,并通过薄的旋涂的紫外线固化液体树脂层或压敏粘接剂(PSA)将这种层粘接到信息存储层。因为现在盘组装了一个以上的辐射束透射层,所以制造在上述规定的范围内变化的盘变得更加困难。因此,对于这种盘,更加重要的是将标称直径设置为基本等于盘的多个覆盖层的最佳标称厚度。因为现在这就成为多变量函数,所以它不能以少数几个的简单曲线图给出。解决这种问题的一种方法是使用射线跟踪方法。现在的问题是应用具有偏离的折射率的透明层的每个光盘制造者都必需计算本身的最佳厚度,因为事先不知道它。在射线跟踪方法中关键的要素是设计者必需定义射线跟踪程序所需要的正确的优质函数以最佳地使盘的一个或多个透明层最佳化。这要求熟练的光学设计者,并且上述的方法容易受到错误的影响。
发明内容
本发明的一个目的是提供一种在开头段落中所描述的这种类型的光学信息媒体,这种光学信息媒体具有厚度基本均匀的k个辐射束透射层,k≥2,在这种光学信息媒体中第k辐射束透明层具有使聚焦辐射束在所说的束的焦点上球面像差为零或基本等于零的平均厚度。
本发明的另一目的是提供一种制造这种光学信息媒体的方法。
实现第一目的在于通过下式确定辐射束透明层k的平均厚度dk:
D(n)表示使在聚焦辐射束的焦点上产生最小的球面波前像差的单层辐射束透射层的厚度相对于折射率的函数,所说的焦点处于第一记录层叠的记录层上。
已经发现,在其它的k-1个辐射束透射层的依赖性方面以这种简单的公式可以精确地确定辐射束透射层k的最佳厚度。术语“其它的”已经暗示层k不需在最后淀积。非常好的是,层k是在k-1个其它的辐射束透射层之间的中间辐射束透射层,例如以液体的形式淀积并随后固化的层。这种液体层具有的优点在于例如通过在这种层的旋涂的过程中改变衬底的旋转速度可以改变它的厚度并使其最佳。应用这种最佳厚度的层k在辐射束的焦点上获得了零或基本等于零的球面像差。在所使用的辐射束波长和在用于读和写光学信息媒体的透镜NA下,对于不根据本发明的单层辐射束透射层,仅需要确定函数D(n)一次。在所说的焦点上具有零或较低的球面像差在从光学信息媒体中读取数据或将数据写入其中的光学的、电的和机械系统的部件中容许更大的误差公差。例如盘的倾斜、透镜的污染、透镜的倾斜、透镜的散焦、标记的不稳定性对盘的可读性和可写性的影响都减小。具有最佳厚度的透射层叠扩展了那些其它的参数的安全系数,这导致系统更加稳定。实验已经显示以上述公式所确定的厚度基本等于厚度的实际理论最佳值,即在这个值的0。1%以内。为了实际使用这个公式,允许+/-0.01D(nk)的带宽,并且平均厚度dk应该在这个带宽中。优选的dk在这个带宽的中间以便能够最佳地利用这个公式。
在优选的实施例中每个辐射束透射层的折射率ni满足1.45≤ni≤1.70。根据现行的标准讨论DVR-蓝盘必需实行这种条件。为了防止在相邻的辐射束透射层的界面上产生的不希望的反射,应该将这些相邻的层的折射率的差值保持较小。在折射率的规定范围内,对于垂直于界面的平面的辐射束,在折射率为1.45的层和折射率为1.70的层之间的界面上的最大的反射(R)从电磁理论的定律中可以推导,它等于:
大多数有机透射层都落在规定范围内。
在特定的实施例中,D(1.60)=100微米。不是根据本发明的表示假设的单个覆盖层的最佳厚度的厚度函数D(n)在1.60的折射率下的值为100微米。对于DVR-蓝格式认为在前文中所提到的D(n)的条件已经实现。在单个的覆盖层的折射率具有不同于1.60的值时应该将单个的覆盖层的厚度调整为不同的值。调整水平取决于光学技术规范,例如用于将辐射束聚焦在记录层上的透镜的NA。
在另一实施例中,通过以基本线性的线条连续连接具有值(1.45,98.5),(1.50,98.6),(1.55,99.2),(1.60,100),(1.65,101.1)和(1.70,102.4)的坐标(n,D(n))来表示D(n)。如在DVR-蓝格式中规定的那样这定义了函数D(n),对于0.85的NA在基本为405纳米的辐射束波长上使它最佳。根据本发明在DVR-蓝盘的情况下在dk的公式中应该使用这个厚度函数D(n)。这个函数在附图4中示出。
在另一实施例中D(1.60)=300微米。不是根据本发明的表示假设单覆盖层的最佳厚度的厚度函数D(n)在1.60的折射率下的值为300微米。在一种可能的高密度DVD(HD-DVD)格式中实现了在前文中所提到的D(n)的条件。HD-DVD格式的可能的结构是:在900微米的衬底上的300微米的覆盖层,其包括在覆盖层和衬底之间的记录层叠或者在600微米的衬底的两侧上的300微米的覆盖,其包括在覆盖和在衬底的两侧上的衬底之间的记录层叠。在两种情况下,总的盘的厚度为1200微米或1.2毫米。在单个的覆盖层的折射率的值不同于1.60时单个的覆盖层厚度应该调整为不同的值。调整水平取决于光学技术规范,例如用于将辐射束聚焦在记录层上的透镜的NA。
在另一实施例中,通过以基本线性的线条连续连接具有值(1.45,303.8),(1.50,301.0),(1.55,299.9),(1.60,300.0),(1.65,301.1)和(1.70,303.0)的坐标(n,D(n))来表示D(n)。在基本为405纳米的辐射束波长上对于基本等于0.70的NA优化时,这将函数D(n)定义成如在DVR-蓝格式中所规定的那样。根据本发明在HDD-DVD-盘的情况下在dk的公式中应该使用这个厚度函数D(n)。这个函数在附图5中示出。
在另一实施例中,通过下式确定透明层k的厚度dk:
允许的dk的带宽的范围被减小到1/10。具有根据这个公式的dk的光学信息媒体通常甚至更加精密地满足了该公式的最佳条件,因此在第一记录层上聚焦辐射束在它的焦点上不存在球面像差方面,优于根据权利要求1所述的媒体。
根据本发明实现第二目的在于一种制造光学信息媒体的方法,该方法包括如下的步骤:提供衬底,在该衬底上淀积层的层叠,该层叠包括至少一个记录层叠和k个辐射束透射层,每个辐射束透射层具有折射率ni和平均厚度di微米,并且1≤i≤k和k≥2。根据本发明第k层的厚度通过dk的公式确定。通常通过旋涂或层压淀积或施加辐射束透射层。
在第一和/或另外的记录层附近的记录层叠中可以存在其它的辅助辐射束透射层。这些辅助层的作用是以改善所说的记录层的记录特性,通常具有大约几十纳米的厚度。这比在权利要求3或权利要求4中典型值D(n)≈100微米允许的带宽小得多。因此,根据本发明可以安全地忽略这些层的厚度,并且不需要用于该公式中。在使用权利要求5的带宽的情况下,因此0.001D(n),对D(n)≈100微米,带宽例如是+/-0.1微米,比几十纳米仍然相当大的。在辅助的辐射束透射层比几十纳米更厚的预期的情况下,根据本发明可以要求将它并入到dk的公式中作为k-1个其它的辐射束透射层中的一个。
如在由申请人申请的美国专利US 5,876,822和美国专利US6,127,049中所描述,适合的记录层叠包括作为记录层的相变合金。这些记录层都是可擦除类型。然而,也可以使用并且不排除其它类型的记录层,比如写一次染料、写一次聚合物染料、可擦除磁光层或荧光层。
附图说明
借助于三个实例性实施例并参考附图更加详细地阐述根据本发明的光学信息媒体。
附图1、2和3分别示出了根据本发明的光学信息媒体的截面示意图。附图尺寸没有按比例;
附图4所示为在405纳米的波长和0.85的NA下最佳的DVR-蓝的厚度函数D(n);
附图5所示为在405纳米的波长和0.70的NA下最佳的HD-DVD的厚度函数D(n);
具体实施方式
实例性实施例1
在附图1中示出了可擦除记录的光学信息媒体20的根据DVR-蓝格式的第一实例性实施例。辐射束10具有405纳米的辐射波长λ和0.85的数值孔径NA,它聚焦在媒体20中。媒体20具有衬底1和在其上提供的层的层叠2。层叠2包括具有IPIM层结构的第一记录层叠3,按照这个顺序,其中I是由(ZnS)80(SiO2)20构成的介质层,P是具有化合物Ge14Sb28Te58的相变合金,M是铝(Al)的金属镜层。在IPIM记录层叠3中的层的厚度分别为115纳米、27纳米、26纳米和100纳米。Al层在衬底1的附近。层叠2进一步包括两个辐射束透射层4,5。第一透射层4由紫外线固化树脂制成,例如由Dainippon Ink andChemicals提供的Daicure EX-860,其折射率n1=1.52,平均厚度d1=4微米。第二辐射束透射层5由聚碳酸脂(PC)制成,其折射率n2=1.60。第二透射层5的平均厚度d2满足如下等式:
D(n)表示使在聚焦辐射束的焦点上产生最小的球面波前像差的单层辐射束透射层的厚度相对于折射率的函数(微米),所说的焦点处于第一记录层叠3的记录层上。通过以基本线性的线条连续连接具有值(1.45,98.5),(1.50,98.6),(1.55,99.2),(1.60,100),(1.65,101.1)和(1.70,102.4)的坐标(n,D(n))来表示DVR-蓝的函数D(n)。DVR-蓝的函数D(n)在附图4中示出。D(1.60)=100微米,而D(1.52)=98.84微米,这个值是通过线性插值确定的。这就得到了d2的95.95微米的值。通过在已经淀积了记录层叠3的衬底1上配制紫外线固化树脂的圆角可以施加第一辐射束透射层。衬底1安装在旋涂器的卡盘上。在圆角的顶部上施加由厚度为95.95微米的预切割的PC薄片组成的第二透射层5。随后以大约5000rpm的转速旋转衬底1,通过旋转由于离心力的作用紫外线固化树脂被局部地驱使到外面,在PC薄片5和记录层叠3之间形成树脂层4。在旋转之后树脂层4具有基本均匀的厚度。通过改变衬底1的旋转速度,树脂层4的厚度可以调整。此后通过暴露在适合的紫外线源下用紫外线固化树脂。在以紫外线光固化之后使树脂层4的厚度为4微米的旋转速度必需实验确定。PC薄片5可以要求精整以与衬底1的形状匹配。因此双覆盖层的总的厚度为99.95微米,它是紫外线固化树脂4和PC薄片5的厚度的总和。如上文所指出第k透射层不必淀积PC薄片5,并且也可以是紫外线固化层4。在这种情况下可以选择厚度为96微米或者任何其它市售的厚度的PC薄片5,随后根据本发明的公式可以计算紫外线固化层4的厚度。然而,淀积或施加层4和5的方法与上文所描述的方法相同。
实例性的实施例2
在附图2中示出了可擦除记录的光学信息媒体20的根据DVR-蓝格式的第二实例性实施例。辐射束10具有405纳米的辐射波长λ和0.85的数值孔径NA,它聚焦在媒体20中。媒体20具有衬底1和在其上提供的层的层叠2。层叠2包括第一记录层叠3和两个辐射束透射层6,7,第一记录层叠3与在实例性实施例1中所描述的层叠3相同。第一透射层6由市售的例如3M的压敏粘胶剂(PSA)层制成。PSA层6可以包括透明背衬和/或载体层,例如可任选的表面处理的非晶聚合物层,比如在每侧上带有粘胶剂层的聚乙烯对苯二酸盐(PET)、PC或聚甲基丙烯酸甲酯(PMMA)层,但可取的是它是一种不包括背衬和/或载体层的转印胶片。PSA通常在粘胶剂层上具有保护性箔,在应用之前必需除去该保护性箔。在本实例中PSA层6是以PMMA为基础,并具有折射率n1=1.5015,并且平均厚度d1=30微米。第二辐射束透射层7是一种预切割PC薄片,在所使用的辐射束波长下折射率n2=1.60。第二透射层7的平均厚度d2满足如下的等式:
D(n)表示使在聚焦辐射束的焦点上产生最小的球面波前像差的单层辐射束透射层的厚度相对于折射率的函数(微米),所说的焦点处于第一记录层叠3的记录层上。通过以基本线性的线条连续连接具有值(1.45,98.5),(1.50,98.6),(1.55,99.2),(1.60,100),(1.65,101.1)和(1.70,102.4)的坐标(n,D(n))来表示DVR-蓝盘的这种函数D(n)。DVR-蓝的函数D(n)在附图4中示出。因此D(1.60)=100微米,而D(1.5015)=98.6微米。这就得到d2的69.57微米的目标值。通过如下的方式可以应用PSA层6:从预切割PSA层6的第一侧上消除第一保护性箔,以滚轮,或者可取的是在真空中,将它层压在衬底1上,该衬底1已经有记录层叠3淀积在它上。此后,从预切割PSA层6的第二侧上消除第二保护性箔,以滚轮,或者可取的是在真空中,将PC薄片7层压在PSA层6的顶部。随后,PC薄片7可以要求精整以与衬底1的形状匹配。因此双覆盖层的总的厚度为99.57微米,它是PSA层6和PC薄片7的厚度的总和。如上文所指出第k透射层不必是最后施加的PC薄片7,而也可以是PSA层6。在这种情况下可以选择厚度为70微米或者任何其它市售的厚度的PC薄片7,随后根据本发明的公式可以计算PSA层6的厚度。然而,淀积或应用层6和7的方法和顺序与上文所描述的相同。
实例性实施例3
在附图3中示出了可擦除记录的光学信息媒体20的根据DVR-蓝格式但具有附加的第二记录层叠的第三实例性实施例。辐射束10具有405纳米的辐射波长λ和0.85的数值孔径NA,它聚焦在媒体20中。媒体20具有衬底1和在其上提供的层的层叠2。层叠2包括具有第一记录层叠3、第二记录层叠3′和三个辐射束透射层11,12,13。第一记录层叠3具有与实例性实施例1类似的IPIM结构,按照如下的顺序包括:
-厚度为30纳米的介质层(ZnS)80(SiO2)20,
-厚度为25纳米的化合物GeSb2Te4的记录层,
-厚度为15纳米的介质层(ZnS)80(SiO2)20,
-厚度为100纳米的在与衬底相邻的铝镜层。
第二记录层叠3′具有IPIMI+结构,它与实例性实施例1类似但它具有增加的附加介质层I+,按照如下的顺序包括:
-厚度为30纳米的介质层(ZnS)80(SiO2)20,
-厚度为6纳米的化合物GeSb2Te4的记录层,
-厚度为15纳米的介质层(ZnS)80(SiO2)20,
-厚度为15纳米的透明银层,
-厚度为130纳米的另一个AIN介质层I+。
第一透射层是市售的例如3M的压敏粘胶剂(PSA)层11。PSA层11可以包括透明背衬和/或载体层,例如任选的表面处理的非晶态聚合物层,比如在每侧上带有粘胶剂层的聚乙烯对苯二酸盐(PET)、PC、聚甲基丙烯酸甲酯(PMMA)层,但可取的是它是一种不包括背衬和/或载体层的转印胶片。PSA通常在粘胶剂层上具有保护性箔,在应用之前必需除去该保护性箔。在本实例中PSA层11是以PMMA为基础,并具有折射率n1=1.5015和平均厚度d1=26微米。第二透射层12由紫外线固化树脂制成,例如由Dainippon Ink and Chemicals提供的DaicureEX-860,在所使用的辐射束波长下其折射率n2=1.52,并且平均厚度d2=4微米。第三辐射束透射层13是一种预切割PC的薄片,在所使用的辐射束波长下其折射率n3=1.60。第三透射层13的平均厚度d3满足如下等式:
其中
D(n)表示使在聚焦辐射束的焦点上产生最小的球面波前像差的单层辐射束透射层的厚度相对于折射率的函数(微米),所说的焦点处于第一记录层叠3的记录层上。通过以基本线性的线条连续连接具有值(1.45,98.5),(1.50,98.6),(1.55,99.2),(1.60,100),(1.65,101.1)和(1.70,102.4)的坐标(n,D(n))来表示DVR-蓝盘的这种函数D(n)。DVR-蓝的函数D(n)在附图4中示出。D(1.60)=100微米,D(1.5015)=98.6微米,D(1.52)=98.84微米,这个值是通过线性插值确定的。这就得到了d3的69.58微米的目标值。忽略在记录层叠3和3′中的辅助透射层,透射层的总厚度为99.58微米,它是PSA层11、紫外线固化树脂层12和PC薄片13的厚度之和。应该注意的是,在执行读出或写入到第二记录层叠3′的记录层中时,必需将聚焦辐射束10的焦点移到记录层叠3′的记录层的水平上。这在附图3中通过虚线辐射束10′表示。由于辐射束10′现在仅通过紫外线固化树脂层12和PC薄片13聚焦,因此在辐射束10′的焦点上存在相当大的球面像差。这必需通过聚焦辐射束10′的读/写单元的光学系统进行校正。
实例性实施例4
一种通过具有辐射波长λ和数值孔径NA的聚焦辐射束进行记录的光学信息媒体,所说的媒体具有衬底和在该衬底上提供的层的层叠,该层叠包括至少第一记录层叠和k个辐射束透射层,每个辐射束透射层具有折射率ni和平均厚度di微米,并且1≤i≤k,且k≥2,
其特征在于辐射束透射层k的平均厚度dk满足如下等式:
D(n)表示使在聚焦辐射束的焦点上产生最小的球面波前像差的单层辐射束透射层的厚度以微米为单位相对于折射率的函数,所说的焦点处于第一记录层叠(3)的记录层上。
实例性实施例5
具有实例性实施例4的特征的光学信息媒体,其特征在于每个辐射束透射层的折射率ni满足1.45≤ni≤1.70。
实例性实施例6
具有实例性实施例4或5的特征的光学信息媒体,其特征在于D(1.6)=100微米。
实例性实施例7
具有实例性实施例6的特征的光学信息媒体,其特征在于通过以基本线性的线条连续连接具有值(1.45,98.5),(1.50,98.6),(1.55,99.2),(1.60,100),(1.65,101.1)和(1.70,102.4)的坐标(n,D(n))来表示D(n)。
实例性实施例8
具有实例性实施例4或5的特征的光学信息媒体,其特征在于D(1.6)=300微米。
实例性实施例9
具有实例性实施例8的特征的光学信息媒体,其特征在于通过以基本线性的线条连续连接具有值(1.45,303.8),(1.50,301.0),(1.55,299.9),(1.60,300.0),(1.65,301.1)和(1.70,303.0)的坐标(n,D(n))来表示D(n)。
实例性实施例10
具有实例性实施例4-9的特征的光学信息媒体,其特征在于
实例性实施例11
一种制造通过具有辐射波长λ和数值孔径NA的聚焦辐射束进行记录的光学信息媒体的方法,该方法包括如下的步骤:
-提供衬底,
-在该衬底上淀积层的层叠,该层叠包括至少一个记录层叠和k个辐射束透射层,每个辐射束透射层具有折射率ni和平均厚度di微米,并且1≤i≤k和k≥2,
其特征在于:
-淀积第k层,使其具有通过如下公式确定的平均厚度dk:
D(n)表示使在聚焦辐射束的焦点上产生最小的球面波前像差的单层辐射束透射层的厚度以微米为单位相对于折射率的函数,所说的焦点处于第一记录层叠(3)的记录层上。
实例性实施例12
具有实例性实施例11的特征的制造光学信息媒体的方法,其特征在于每个辐射束透射层的折射率ni满足1.45≤ni≤1.70。
实例性实施例13
具有实例性实施例11或12的特征的制造光学信息媒体的方法,其特征在于D(1.6)=100微米。
实例性实施例14
具有实例性实施例13的特征的制造光学信息媒体的方法,其特征在于通过以基本线性的线条连续连接具有值(1.45,98.5),(1.50,98.6),(1.55,99.2),(1.60,100),(1.65,101.1)和(1.70,102.4)的坐标(n,D(n))来表示D(n)。
实例性实施例15
具有实例性实施例11或12的特征的制造光学信息媒体的方法,其特征在于D(1.6)=300微米。
实例性实施例16
具有实例性实施例15的特征的制造光学信息媒体的方法,其特征在于通过以基本线性的线条连续连接具有值(1.45,303.8),(1.50,301.0),(1.55,299.9),(1.60,300),(1.65,301.1)和(1.70,303.0)的坐标(n,D(n))来表示D(n)。
根据本发明提供了一种用于记录的光学信息媒体比如DVR-蓝和制造这种媒体的方法。通过波长为λ和数值孔径为NA的聚焦辐射束执行从媒体中读取和记录到媒体中。所说的媒体具有衬底和在该衬底上提供的层的层叠。该层叠包括至少第一记录层叠和k个辐射束透射层。每个辐射束透射层具有折射率ni和平均厚度di微米,其中1≤i≤k,且k≥2。根据参数ni(i=1...k)和di(i=1...k-1)通过简单的公式确定层k的厚度dk。这种媒体在所说的辐射束的处于第一记录层叠的记录层上的焦点上具有基本为零的球面像差。
Claims (7)
1. 一种通过具有辐射波长λ和数值孔径NA的聚焦辐射束(10)进行记录的光学信息媒体(20),所说的媒体(20)具有衬底(1)和在该衬底上提供的层的层叠(2),该层叠(2)包括至少第一记录层叠(3)和k个辐射束透射层(4,5,6,7,11,12,13),每个辐射束透射层(4,5,6,7,11,12,13)具有折射率ni和平均厚度di微米,并且1≤i≤k,且k≥2,
其特征在于辐射束透射层k的平均厚度dk满足如下等式:
2. 如权利要求1所述的光学信息媒体(20),其特征在于每个辐射束透射层(4,5,6,7,11,12,13)的折射率ni满足1.45≤ni≤1.70。
3. 如权利要求1或2所述的光学信息媒体(20),其特征在于D(1.6)=100微米。
4. 如权利要求3所述的光学信息媒体(20),其特征在于通过以基本线性的线条连续连接具有值(1.45,98.5),(1.50,98.6),(1.55,99.2),(1.60,100),(1.65,101.1)和(1.70,102.4)的坐标(n,D(n))来表示D(n)。
5. 如权利要求1或2所述的光学信息媒体(20),其特征在于D(1.6)=300微米。
6. 如权利要求5所述的光学信息媒体(20),其特征在于通过以基本线性的线条连续连接具有值(1.45,303.8),(1.50,301.0),(1.55,299.9),(1.60,300.0),(1.65,301.1)和(1.70,303.0)的坐标(n,D(n))来表示D(n)。
7. 如权利要求1或2所述的光学信息媒体(20),其特征在于 微米。
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WO2003044786A1 (en) * | 2001-11-23 | 2003-05-30 | Koninklijke Philips Electronics N.V. | Multi-stack optical data storage medium and use of such medium |
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2001
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- 2001-12-20 JP JP2002560133A patent/JP4113777B2/ja not_active Expired - Lifetime
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2002
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2006
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Patent Citations (2)
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CN1239800A (zh) * | 1998-06-18 | 1999-12-29 | Lg电子株式会社 | 光记录介质和光记录/重放方法与装置 |
EP1047055A1 (en) * | 1999-04-22 | 2000-10-25 | 3M Innovative Properties Company | Optical storage medium |
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