CN1547741A - 具有改善的尺寸稳定性的数据存储介质 - Google Patents

具有改善的尺寸稳定性的数据存储介质 Download PDF

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CN1547741A
CN1547741A CNA028166493A CN02816649A CN1547741A CN 1547741 A CN1547741 A CN 1547741A CN A028166493 A CNA028166493 A CN A028166493A CN 02816649 A CN02816649 A CN 02816649A CN 1547741 A CN1547741 A CN 1547741A
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layer
storage media
optical storage
high modulus
directly contacts
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CN100358027C (zh
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艾琳・德里斯
艾琳·德里斯
・海
格兰特·海
・F・哈伯德
史蒂文·F·哈伯德
克・T・范德格兰佩尔
亨德里克·T·范德格兰佩尔
・博文
格尔特·博文
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SHPP Global Technologies BV
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General Electric Co
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Abstract

本发明涉及数据存储介质，具体地涉及包括至少一个用于控制存储介质平面度的高(杨氏)模量层的数据存储介质。

Description

具有改善的尺寸稳定性的数据存储介质
本申请要求2001年8月31日提交的题为“数据存储介质”的美国待审专利申请第60/316,534号的优先权。
技术领域
本公开涉及数据存储介质，具体地涉及包括至少一个高模量层(highmodulus layer)以控制存储介质的总平面度的数据存储介质。
背景技术
光学数据存储介质中数据存储密度的增加有利于改善数据存储技术，例如，但不限于，只读介质、一次性写入式介质、可擦写介质、数字多用途介质以及磁光(MO)介质。
随着光学数据存储介质中数据存储密度增加以提供更新的技术，例如，但不限于，数字多用途光盘(DVD)和用于例如数字视频记录器(DVR)等的短期和长期大容量数据外置存储器(data archive)的更高密度数据盘，光学数据存储装置的透明构件的设计要求已变得日益严格。具有愈来愈短的读写波长的盘已成为光学数据存储装置中积极努力的目标。一直以来人们探求着优化数据存储装置的物理特性的材料和方法。用于光学数据存储介质中的材料的设计要求包括，但不限于，盘面平面度(例如，倾斜度)、滤水(waterstrain)、低双折射率、高透明度、耐热性、可延展性和介质均匀性(例如颗粒浓度)。已发现当前使用的材料缺乏一种或多种这些特性，因而需要新的材料以便在光学数据存储介质中实现更高的数据存储密度。盘平面度，也用倾斜度表示，是高数据存储密度应用所需的关键性质。因此，长期以来对于于具有改善的尺寸稳定性和最小倾斜度的数据存储介质存在尚不满足需要的认识。
发明内容
在一实施例中，本公开涉及一种不对称光学存储介质，包括一层，该层改善所述介质中的尺寸稳定性，其中该非对称光学存储介质包括至少一个衬底层、至少一个数据层、至少一个高模量层和至少一个薄膜层。
在另一实施例中，本申请涉及一种用于减小不对称光学存储介质的倾斜度的方法，所述方法包括一添加步骤，其中高模量层被添加到一光学存储介质，使得所述介质的方向稳定性增加。
附图说明
通过参考以下的详细说明、所附的权利要求书和附图，本公开的各种特征、方面和优点将变得显而易见。
图1为本发明的数据存储介质(10)的一实施例的剖视图，其中该介质包括与数据层(30)直接接触的衬底层(20)、与薄膜层(40)直接接触的数据层(30)和与高模量层(50)直接接触的薄膜层(40)；以及
图2为本发明的数据存储介质(60)的另一实施例的剖视图，其中该介质包括与数据层(80)直接接触的衬底层(70)、与高模量层(90)直接接触的数据层(80)和与薄膜层(100)直接接触的高模量层(40)。
具体实施方式
本公开描述了使用聚合材料作为数据存储介质。在本公开的一实施例中，该数据存储介质(图1中的部件10；图2中的部件60)包括多个层，所述多个层包括至少一个衬底层、与所述衬底层直接接触的至少一个数据层、至少一个高模量层以及至少一个薄膜层。如这里所采用的，术语“高模量”意指通常大约1吉帕斯卡(GPa)的拉伸模量。该高模量层通过减小所述数据存储介质的倾斜度有效地增加所述数据存储介质的尺寸稳定性。如这里所采用的，术语“倾斜度”意指一数据存储介质在水平轴线上弯曲的弧度数(number of radial degree)，并且其通常以所述存储介质的外侧半径处垂直偏差来测量。通常，所述倾斜度为以度数来测量的平均半径偏差的一半。
在本公开的上下文中，典型的数据存储介质由多个聚合构件组成，所述多个聚合构件通常根据所述数据存储介质的特定性质和要求通过层叠具有不同厚度的水平的层被复合。数据存储介质的一主要构件为衬底层(图1中的部件20；图2中的部件70)。该衬底层通常由聚合材料制成，其包括至少一个选自由热塑性聚合物、热固聚合物及其任意组合物构成的组中的组分。加成聚合物和缩合聚合物都适于本发明。这里所采用的“热塑聚合物”在本领域中也指热塑树脂，其定义为具有大分子结构的材料，该材料将反复地在加热时被软化、在冷却时被硬化。热塑聚合物的示例类别包括，但不限于，苯乙烯、丙烯酸树脂、聚乙烯、乙烯基、尼龙和碳氟化合物。这里所采用的“热固聚合物”在本领域中也指热固树脂，其定义为当首先在压力下加热时固化并且在不破坏其原有性质的情况下无法重熔或重铸的材料。热固聚合物的示例类别包括，但不限于，环氧化物、三聚氰胺、酚醛塑料和尿素塑料。适于所述衬底成的热塑聚合物的示例包括，但不限于，源于石蜡的聚合物(例如，聚乙烯、聚丙烯及其共聚物)、聚甲基戊烷；源于二烯烃的聚合物(例如，聚丁二烯、聚异戊二烯及其共聚物)、未饱和羧酸的聚合物及其功能衍生物(例如，聚(烷基丙烯酸酯)、聚(烷基甲基丙烯酸酯)、聚丙烯酰胺、聚丙烯腈和聚丙烯酸等的丙烯酸聚合物)、烯基芳族聚合物(例如，聚苯乙烯、聚-α-甲基苯乙烯、聚甲基苯乙烯和橡胶改性的聚苯乙烯)、聚酰胺(例如，尼龙-6、尼龙-6，6、尼龙-1，1和尼龙-1，2)、聚酯；聚碳酸酯；聚酯碳酸酯；例如聚亚芳基醚、聚醚砜、聚醚酮、聚醚醚酮(polyetheretherketone)、聚醚酰亚胺等的聚醚；聚亚芳基硫醚、聚砜、聚硫砜；以及液晶聚合物。在一实施例中，所述衬底层包括热塑聚酯。热塑聚酯的适合的例子包括，但不限于，聚(对苯二甲酸乙二酯)、聚(对苯二甲酸1，4-丁二酯)、聚(对苯二甲酸1，3-丙二酯)、聚(对苯二甲酸环乙烷二甲醇)、聚(环乙烷二甲醇与对苯二甲酸乙二酯的共聚物)、聚(萘二甲酸乙二酯)、聚(萘二甲酸丁二酯)和多芳基化合物。
在另一实施例中，所述衬底层包括热塑弹性聚酯(TPE’s)。如这里定义的，热塑弹性体为可以作为热塑材料加工并同时具有传统热固树脂的某些特性的材料。适合的热塑弹性聚酯例子包括，但不限于，聚醚酯、聚(对苯二甲酸亚烃酯)、聚(对苯二甲酸乙二酯)、聚(对苯二甲酸丁二酯)、包括聚(环氧烷烃)的软嵌段特别是聚(乙撑氧)和聚(环氧丁烷)的嵌段的聚醚酯、例如通过芳香聚胺酯与二羧酸缩聚而合成的那些聚酰胺酯以及任何具有羧酸端基的聚酯。
可选择地，所述衬底层还可以包括至少一个介电层、至少一个绝缘层或者它们的组合。通常被用作热控制器的介电层典型地具有大约200和大约1000之间的厚度。适合的介电层包括，但不限于，氮化层(例如，氮化硅(silicone nitride)、氮化铝)、氧化层(例如，氧化铝)、碳化物层(例如，碳化硅)以及任何包括至少一种上述材料和任何不与周围层反应的相兼容的材料的组合物。
在本公开的上下文中，典型的数据存储介质还包括至少一个数据层(图1中的部件30；图2中的部件80)。通常包括一反射金属层的该数据层可以由任何能够存储可恢复数据的材料制成，例如光学层、磁性层、磁光层。典型的数据层的厚度最大可达大约600埃()。在一实施例中，数据层的厚度最大可达大约300。存储在数据存储介质上的信息可以直接标记到数据层的表面上，或者存储在已沉积到衬底层表面上的通过光、热或磁可定义的介质中。适合的数据存储层典型地由至少一个选自由，但不限于，氧化物(例如氧化硅(silicone oxide))、稀土元素与过渡金属的合金、镍、钴、铬、钽、铂、铽、钆、铁、硼、有机染料(例如花青或酞菁型染料)、无机相变化合物(例如TeSeSn或InAgSb)、以及包括至少一种上述材料的任何合金或组合物。
所述反射金属层应该具有足够反射一定量的能量的厚度，所述一定量的能量足以使数据恢复。典型地，反射层具有最大可达大约700的厚度。在一实施例中，该反射层的厚度为介于大约300和大约600之间。合适的反射层包括，但不限于，铝、银、金、钛和包括至少一种上述材料的合金和混合物。除了数据存储层，可以使用介电层、保护层和反射层、其他层，例如润滑层、粘接层及其它。适合的润滑剂层包括，但不限于，例如氟润滑油和润滑脂的氟代化合物。
在本公开的上下文中，典型的数据存储介质还包括至少一个高模量层(图1中的部件40；图2中的部件100)。在本公开的一实施例中，适合的高模量层典型地包括热固聚合物，其可以被热固化，通过紫外(UV)辐射固化，或者通过任何本领域技术人员公知的方法固化。在本公开的另一实施例中，该高模量层包括热塑聚合物。在本公开的又一实施例中，该高模量层包括热固聚合物和热塑聚合物的组合。典型地，该高模量层通过旋涂工艺被应用于所述存储介质，然而，可以使用任何本领域技术人员公知的方法来沉积厚度在大约0.5微米至大约30微米范围内的高模量层到该数据存储介质上，例如，但不限于，喷镀沉积、溅射和等离子体沉积。热固聚合物的示例包括，但不限于，源于硅树脂的聚合物、聚苯醚(polyphenelene ether)、环氧树脂、氰酸酯、未饱和聚酯、多功能烯丙基材料、邻苯二甲酸二烯丙酯(diallylphthalate)、蜜胺甲醛(melamine-formaldehyde)、脲甲醛、苯并环丁烷、羟甲基呋喃、异氰酸酯和它们的任何组合物。在一实施例中，该热固聚合物还包括至少一个热塑聚合物，例如，但不限于，聚苯醚、聚苯硫醚、聚砜、聚醚酰亚胺或聚酯。典型地，该高模量层为共聚碳酸酯。在所述热固材料固化之前，该热塑聚合物典型地与热固单体混合物组合。此外，该高模量可以在压敏粘接剂的叠合工艺过程中被添加。
目前，存储介质的尺寸由本行业指定以使得它们可以使用在目前可得到的数据存储介质读写装置中。数据存储介质典型地具有大约15mm至大约40mm范围内的内径和大约65mm至大约130mm范围内的外径，大约0.4mm至大约2.5mm范围内的衬底厚度，其中优选的厚度最大可达大约1.2mm。如果必要可以使用其他尺寸直径和厚度以获得刚性更强的结构。
这里描述的存储介质可以使用在传统光学、磁光和磁性系统中，同时也可以使用在要求更高质量存储介质、面密度或同时要求二者的高级系统中。在使用过程中，该存储介质与读/写装置相关地设置，使得能量(例如，磁、光、电或它们的组合)以入射到数据存储介质上的能量场的方式与所述数据层接触。该能量场接触设置在数据介质上的数据层。该能量场在存储介质中造成物理或化学变化，以便记录在数据层上的该位置处的入射角。例如，入射的磁场可以改变数据层内磁畴的取向，或者入射光束可以在光加热在数据层上的接触点处引起相变。
可以使用多种方法来制造该存储介质，包括，但不限于，注射成型、发泡(foaming)工艺、等离子体汽相沉积、真空沉积、电沉积、旋涂、喷涂、凹凸涂敷(meniscus coating)、数据模印(data stamping)、模压加工、表面抛光、固定安装(fixturing)、叠合、旋转成型、双液成型、共注射、薄膜的过渡成型、微孔成型以及它们的组合。在一实施例中，所使用的技术能够原位制造具有例如凹坑和凹槽等所需特征。一个这种工艺包括注射成型加压技术，其中一模制件利用这里定义的熔融的聚合物被填充。该模制件可以包括一操作或插入。该聚合物系统被冷却并且在仍处于至少部分熔融状态时被加压以便将设置成螺旋同心的或者其他取向的所需表面特征，例如凹坑和凹槽等，印制到所述衬底的所需部分上，即所需区域的一侧或两侧。该衬底随后被冷却至室温。
以下示例为本领域技术人员提供实施本发明的进一步指导。所提供的示例仅仅是本公开的代表性示例。因此，以下示例不以任何方式用来限定所附权利要求书中定义的本发明。
示例
环形数据存储盘按照如下方法制造。由4，4’-亚异丙基二苯酚聚碳酸酯(4，4’-isopropylidenediphenol-polycarbonate)聚合物(BPA-PC)组成的衬底层被模制成大约1.1mm厚的圆盘，其内部半径为大约15mm，外部半径为大约120mm。大约500埃厚的金属数据层被溅射到该BPA-PC衬底盘的一个表面上。如表1描述的不同厚度的丙烯酸清漆层(Daicure SD-698)被旋涂到所述盘的金属数据层上，并且该清漆使用UV辐照加以固化。采用25微米厚的模量可忽略的压敏粘接剂将大约75微米厚的共聚碳酸酯薄膜粘接到所述圆盘的丙烯酸层上，以生成具有与图2所显示的相似的层结构的圆形数据存储盘。该数据存储盘在大约50％的湿度环境下被平衡。该数据存储盘随后从初始湿度为50％的该第一环境转移到湿度大约为90％的第二环境下。当该盘在90％的湿度下被平衡时，在半径为55mm处随时间测量该数据存储盘的倾斜度。当所述盘在90％湿度环境中再次平衡时所测量的具有不同旋涂高模量层厚度的数据存储盘随动态周期的最大半径倾斜度的结果显示于表1中。
             表1
高模量清漆厚度(微米) 在55mm处的最大半径倾斜度(度)
0 0.316
6.6 0.196
14.6 0.127
27.1 -0.171
如表1中的结果所显示的，将该高模量清漆层添加到所述数据存储盘降低了数据存储盘从第一湿度水平到第二湿度水平平衡的动态周期过程中所述盘的半径倾斜度。
虽然已举例说明并描述了本发明，然而其不是局限于所显示的以上详细描述，因为在不脱离本公开的精神的情况下可以做出各种改动和替换。同样地，对于本领域普通技术人员，仅通过常规的实验即可以产生这里公开的本发明的进一步的改动和等价物，因而有理由相信所有这些改动和等价物落在所附权利要求书定义的本公开的精神和范围内。

Claims (20)

1.一种不对称的光存储介质，包括一改善所述介质中方向稳定性的层。
2.如权利要求1所述的光存储介质，其中所述层为高模量层。
3.如权利要求2所述的光存储介质，其中所述高模量层包括一可以采用紫外光加以固化的材料。
4.如权利要求3所述的光存储介质，其中所述材料包括选自于由丙烯酸酯、环氧树脂、硅烷丙烯酸酯、尿烷及它们的任意组合物构成的组中的至少一种组分。
5.如权利要求2所述的光存储介质，其中所述高模量层包括一可以被热固化的材料。
6.如权利要求5所述的光存储介质，其中所述材料包括选自于由硅氧烷硬涂料、具有可水解硅烷的氧化硅、环氧树脂、尿烷、酰亚胺、硅氧烷及它们的任意组合物构成的组中的至少一种组分。
7.如权利要求4所述的光存储介质，其中所述丙烯酸酯为选自于由聚甲基丙烯酸甲酯、甲基丙烯酸甲酯与聚酰亚胺的共聚物、甲基丙烯酸甲酯与硅氧烷的共聚物及它们的任意组合物构成的组中的至少一种。
8.如权利要求2所述的光存储介质，其中所述高模量层与一数据层直接接触。
9.如权利要求2所述的光存储介质，其中所述高模量层与一薄膜层直接接触。
10.如权利要求2所述的光存储介质，其中所述高模量层的厚度介于大约0.01微米和大约50微米之间。
11.如权利要求2所述的光存储介质，其中所述高模量层具有大于或等于所述衬底的模量的模量。
12.一种不对称光存储介质，包括以下层：
至少一个衬底层；
至少一个数据层，其与所述衬底层直接接触；
至少一个高模量层，其与所述数据层直接接触；以及
至少一个薄膜层，其与所述高模量层直接接触。
13.如权利要求12所述的光存储介质，其中所述衬底层为聚合材料，该聚合材料包括选自于由热塑性聚合物、热固聚合物及它们的任意组合物构成的任意组中的至少一种。
14.如权利要求13所述的光存储介质，其中所述热塑性聚合物为选自于由聚酯、聚碳酸酯、聚苯乙烯、聚甲基丙烯酸甲酯、聚酮、聚酰胺、芳香聚醚、聚醚砜、聚醚酰亚胺、聚醚酮、聚苯醚、聚苯硫醚及它们的任意组合物构成的组中的一种。
15.如权利要求12所述的光存储介质，其中所述数据层包括选自于由热塑性聚合物、热固聚合物及它们的任意组合物构成的组中的至少一种组分。
16.如权利要求12所述的光存储介质，其中所述高模量层包括选自于由热塑性聚合物、热固聚合物及它们的任意组合物构成的组中的至少一种组分。
17.如权利要求12所述的光存储介质，其中所述薄膜层包括选自于由均聚物、共聚物、热塑性聚合物、热固聚合物及它们的任意组合物构成的组中的至少一种组分。
18.如权利要求17所述的光存储介质，其中所述热固聚合物被旋涂。
19.一种减小不对称光存储介质的倾斜度的方法，所述方法包括一添加步骤，其中一高模量层被添加到光存储介质使得所述介质的方向稳定性增加。
20.如权利要求19所述的方法，其中所述光存储介质包括：
至少一个衬底层；
至少一个数据层，其与所述衬底层直接接触；
至少一个高模量层，其与所述数据层直接接触；以及
至少一个薄膜层，其与所述高模量层直接接触。
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US20050117405A1 (en) 2005-06-02
KR100762745B1 (ko) 2007-10-02
US6716505B2 (en) 2004-04-06
US6893700B2 (en) 2005-05-17
US7314658B2 (en) 2008-01-01
US20030198774A1 (en) 2003-10-23
US20030044564A1 (en) 2003-03-06
US20060099377A1 (en) 2006-05-11
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