CN1816872A - 数据存储基质的覆盖层及其制备方法 - Google Patents
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Abstract
本发明提供一种数据存储基质的覆盖层,其包括硬涂层、包含塑料的基片、和粘合剂层。因此,可提供均匀厚度的覆盖层,并可赋予数据存储基质耐擦伤性和耐污染性。
Description
技术领域
本发明涉及数据存储基质的覆盖层,更具体地涉及在蓝色激光(BD)的波长下光盘的覆盖层。
背景技术
用于数据存储的盘源于约1MB的软盘。为提高数据集成的程度而开发研制,软盘变成700~800MB的光盘(CD),并开发出4~10GB的数字通用盘(DVD)。近来,正在研制20GB或更大存储容量的盘片,以提供高质量的声音和成像。记录密度的提高可通过各种方法来完成,且主要取决于辐射光点的微型化。
提高数据集成容量的光点微型化由激光的波长和透镜的数值孔径来确定,并可由下面公式1和2来表示。
公式1
D=1.22λ/NA
公式2
F=λ/NA2
在公式1和2中,D为光点的直径,λ为激光的波长,NA为透镜的数值孔径,F为焦距。
从公式1可看出,如果减小激光的波长(λ)且增大透镜的数值孔径(NA),则光点的尺寸减小。因此,盘的凹槽(pit)和轨道(track)减少,且记录密度与光点的直径的平方值高度成反比。同时,从公式2可看出,如果减小激光的波长(λ)且增大透镜的数值孔径(NA),则焦距减小。
在CD的情况中,由于焦距长,所以在厚度为1.2mm的盘中记录层位于1.1mm的位置处。因此,CD可按下面方法来制备,在厚度为1.1mm的聚碳酸酯基片上涂布记录层,在记录层上涂布反射层和反射保护层,和将标签附着在反射保护层上。DVD具有减小的焦距,这样在厚度为1.2mm的盘中记录层应位于0.6mm的位置处。因此,DVD可按下面方法来制备,在厚度为0.6mm的聚碳酸酯基片上涂布记录层,在记录层上涂布反射层,和通过粘结处理将已涂布的聚碳酸酯基片与厚度为0.6mm的另一个聚碳酸酯基片粘合。在CD和DVD中,记录层可分别受到1.1mm厚度的聚碳酸酯基片和0.6mm厚度的聚碳酸酯基片的保护。在CD的反射保护层的涂布和DVD的粘结工艺中,采用旋涂法,以提供厚度为数μm到数十μm的涂层。
同时,在新一代光记录介质即蓝色激光波长下的光盘的情况中,它的焦距减少得更多,因此在厚度为1.2mm的盘中记录层应位于0.1mm的位置处。在蓝色激光波长下的单层光盘的情况中,则提出:在1.1mm厚度的聚碳酸酯基片上涂布记录层,然后在记录层上涂布很薄的反射层,所制得的光盘用厚度为0.1mm的覆盖层完全覆盖以保护记录层。在蓝色激光波长下的双层光盘的情况中,则提出:因为将厚度为0.025mm的间隔层插入在两记录层之间,所以用厚度为0.075mm的覆盖层来保护记录层。
在蓝色激光波长下的光盘的覆盖层中,允许有±0.002mm的厚度偏差。但是,没有充分开发出具有厚度偏差在上述范围内和厚度为约0.1mm的覆盖层的蓝色激光波长下的光盘的制造方法,以及没有充分开发出覆盖层的材料。此外,厚度偏差在上述范围内和厚度为0.1mm或0.075mm的覆盖层应用于蓝色激光波长下的光盘的实例尚未公开过。
日本专利公开第平11-345433号披露了,在制造DVD的方法和DVD的粘结工艺中用来粘结两个基片的UV可固化的组合物,该组合物不受来自固化装置的热量的影响。上述发明的特征在于,将UV可固化树脂通过旋涂涂覆在基片的表面,而后用另一个基片覆盖该基片,然后这两个基片通过UV使UV可固化树脂固化而粘结在一起。
U.S.专利第5,609,990号披露了为提供耐磨性而涂覆在CD或磁光(MO)盘的外表面上的UV可固化密封涂层。将低粘度的UV可固化组合物旋涂在CD或MO盘的表面上,以赋予CD或MO盘改进的耐磨和耐腐蚀性。
发明内容
但是,采用旋涂法很难得到厚度为0.1mm或0.075mm的涂层。更具体而言,在技术上难以形成±0.002mm的厚度偏差范围内的均匀厚度的涂层。
此外,由于蓝色激光波长下的光盘与常规的CD或DVD相比,数据集成的程度更高,而在盘的表面和记录层之间其仅有厚度约0.1mm的覆盖层,所以外来物质或擦伤可很容易引起数据重现错误。为了解决此问题,建议将蓝色激光波长下的光盘其本身放置于保护盒中加以保护。然而这种方法增加了蓝色激光波长下的光盘的制造成本,而且其缺点是使用不方便。
本发明提供一种数据存储基质的覆盖层,包括硬涂层、包含塑料的基片、和粘合剂层,该覆盖层具有均匀的厚度,且当应用于数据存储基质时提供耐擦伤性和耐污染性。
根据本发明的目的,提供一种包括硬涂层、包含塑料的基片、和粘合剂层的数据存储基质的覆盖层。
根据本发明的另一目的,提供一种制备数据存储基质的覆盖层的方法,该方法包括:将硬涂层材料涂布在包含塑料的基片的表面上,并使硬涂层材料固化;和将包含粘合剂的粘合剂组合物涂布在所述的包含塑料的基片的另一表面上。
本发明的数据存储基质的覆盖层将保护数据存储基质的记录层,并满足光学设计的条件。特别是,蓝色激光波长下的光盘应具有如制造蓝色激光波长下光盘的公司所提出标准的均匀厚度的覆盖层,即应具有±0.002mm范围内的厚度偏差。
为了满足上述要求,本发明提供一种包括硬涂层、包含塑料的基片、和粘合剂层的数据存储基质的覆盖层,其中硬涂层、包含塑料的基片、和粘合剂层的厚度可分别优选为0.5~20μm、40~90μm和5-40μm。
与通过旋涂法形成数据存储基质的覆盖层的现有技术不同,在本发明中,数据存储基质的覆盖层是以片层的形式提供的,从而可容易地控制覆盖层的厚度并可提供均匀厚度的覆盖层。同样,硬涂层是本发明的覆盖层的组成部分,它弥补了塑料不良的耐擦伤性和不良的耐污染性,从而安全地保护包括覆盖层的数据存储基质免受擦伤和玷污。
本发明的数据存储基质的覆盖层可按下面方法制备,在厚度为40~90μm的包含塑料的基片的表面上涂布硬涂层材料至0.5~20μm的厚度,并使硬涂层材料固化,和在包含塑料的基片的另一表面上涂布包含粘合剂的粘合剂组合物至5~40μm的厚度。所制得的覆盖层最终厚度为45.5~150±2μm。
包含塑料的基片作为本发明覆盖层的支架并应具有预定的性质,以便不损害数据存储覆盖层的功能。包含塑料的基片可优选具有以下光学性质:1.45~1.55的折射率;在405nm下89%或更高的激光透射率;1.5×10-4或更低的平面内双折射率;和1.2×10-3或更低的垂直面双折射率。包含塑料的基片可优选沿直径方向具有最大0.6°的反射光束角偏移和沿切线方向具有最大0.3°的反射光束角偏移。
在本发明中,满足上述光学性质的包含塑料的基片可优选由三乙酰纤维素(TAC)、聚碳酸酯(PC)或其混合物组成。可根据数据存储基质的类型,并且更具体而言,取决于蓝色激光波长下的各种光盘所要求的基片的厚度选择包含塑料的基片的材料。
硬涂层赋予包含塑料的基片耐擦伤性和耐污染性,硬涂层可通过在包含塑料的基片的表面上涂布硬涂层材料至0.5~20μm的厚度并使硬涂层材料固化而形成。当硬涂层的厚度大于20μm时,厚度偏差增大。当硬涂层的厚度低于0.5μm时,耐擦伤性大大地降低。可采用辊涂、刮刀、帽涂(cap coating)法等进行涂布,和可采用UV固化法进行固化。
在本发明中,在韩国专利申请第2003-18619号中所描述的UV可固化硬涂层材料,即包括反应性丙烯酸酯低聚物、多官能团的丙烯酸酯单体、长链基于氟的丙烯酸酯(fluorine based acrylate)、短链基于氟的丙烯酸酯、引发剂等的UV可固化硬涂层材料可用作硬涂层材料。但是,只要其能提供较高的耐擦伤性和耐污染性而不损害数据存储基质的功能,可用作硬涂层材料的材料并无特别限制。
粘合剂层可优选设置于覆盖层中硬涂层的反面,以将本发明的覆盖层粘附到数据存储的基质上。粘合剂层可通过涂布包含粘合剂的粘合剂组合物至10~40μm的厚度而形成。当粘合剂层的厚度大于40μm时,厚度的偏差增大。当粘合剂层的厚度小于10μm时,难以提供粘合性能,并且由于耐久性低,所以粘合剂层可能变得不牢固。
用于本发明中的粘合剂可以为丙烯酰基类(acryl based)粘合剂组合物,包括丙烯酰基类共聚物、含有至少一个羟基官能团的叔胺醇化合物、和多官能团的异氰酸酯类交联剂。但是,只要它不损害数据存储基质的功能,对其并无特别限制。
在如上所述制备的数据存储基质的覆盖层中,即在包含塑料的基片的一表面上形成硬涂层和包含塑料的基片的另一表面上形成粘合剂层的覆盖层中,保护片可粘附在覆盖层的两表面以保护硬涂层和粘合剂层。
此外,所制备的覆盖层可进行剪裁,从而与数据存储的基质具有相同的尺寸。例如,可采用冲孔工具来裁剪覆盖层,以使其具有光盘的外径120mmΦ和内径15mmΦ。
覆盖层是这样放置的,在除去粘附在覆盖层两表面上的保护片之后,使粘合剂层恰好与数据存储基质的表面相接触,从而所制备的覆盖层可粘着于数据存储的基质上。
参考下面的实施例现将更详细地描述本发明。下面的实施例用于说明本发明的目的,而不企图限制本发明的范围。
附图说明
参考附图,通过详细地描述本发明的示范性实施方案,本发明的上述和其它特征和优点将变得更显而易见,其中:
图1说明本发明的数据存储基质的覆盖层的结构。
具体实施方式
在实施例中制备的覆盖层的物理性质根据如下所述来确定。
通过采用接触角测量仪(由Kruss提供)来测定与纯水的固定接触角,以确定覆盖层的耐污染性。
覆盖层的耐擦伤性由与光盘读取数据相关的抖动值(jitter value)来确定,该抖动值是当采用泰伯磨耗试验机在CS-10F的轮子上在250g的负荷下磨损覆盖层5次时所测得的。
覆盖层的透射率是采用DARSA PRO 5000透射率测量仪(由韩国PSI提供)测定的。
硬涂层的粘合性能根据JIS K5400来确定,即通过提供由辊涂所得到的硬涂层,沿横向和纵向间隔1mm分别划出10条划线,即呈方格图案的情况下进行固化,将玻璃纸带(由Nichvan Co.提供的Cellotape?)牢固地粘着在硬涂层上,然后固定带的一端,并沿与硬涂层的表面成90°的方向用力拉玻璃纸带。硬涂层没有与玻璃纸带脱开,表示为“○”;硬涂层与玻璃纸带脱开,表示为“×”。
采用测微计测定膜的厚度。
实施例1
LGCOMAU 108GN-H(由LG Chemicals提供)为UV可固化硬涂层溶液,将其辊涂在厚度为80mm的三乙酰纤维素(TAC)基片的表面上,并辐射1J/cm2的UV,从而得到5μm厚度的硬涂层。然后,将包括丙烯酰基类共聚物、和含有羟基官能团的叔胺醇化合物、和多官能团的异氰酸酯类交联剂的丙烯酰基类粘合剂组合物涂布在基片的另一表面上至15μm的厚度。将保护片附着在所制备的覆盖层的两表面上。采用冲孔工具来裁剪所制备的覆盖层,以使其外径为120mmΦ和内径为15mmΦ。
在除去保护片之后,将覆盖层粘附到蓝色激光波长下的光盘上,以使粘合剂层与光盘的ZnS/SiO2接触。蓝色激光波长下的光盘的覆盖层的物理性质示于表1中。
对比实施例1
在厚度为85μm的TAC基片的表面上涂布实施例1中所使用的粘合剂组合物至15μm的厚度,并将保护片附着在所制备的覆盖层的两表面上。采用冲孔工具来裁剪所制备的覆盖层,以使其外径为120mmΦ和内径为15mmΦ。
在除去保护片之后,将覆盖层粘附到HD-DVD ROM盘上,以使粘合剂层与HD-DVD ROM盘的金属或金属氧化物层接触。HD-DVDROM盘的覆盖层的物理性质示于表1中。
对比实施例2
将由粘度为5000cP的聚氨酯丙烯酸酯、引发剂和添加剂组成的丙烯酸酯类UV可固化组合物,以800rpm旋涂涂布在蓝色激光波长下的光盘的表面上40秒。所制备的蓝色激光波长下的光盘的覆盖层的物理性质示于表1中。
表1
光盘的覆盖层的物理性质
性质 | 405nm下的透射率 | 抖动值(泰伯试验) | 膜厚度,偏差 | 接触角(°) | 粘合性 |
实施例1 | 89% | 8% | 100±1μm | 98 | ○ |
对比实施例1 | 93% | 伺服错误(Servo error) | 100±1μm | 77 | ○ |
对比实施例2 | 89% | 伺服错误 | 90±20μm | 66 | ○ |
从表1可看出,采用片层形式的、包括硬涂层、包含塑料的基片和粘合剂层的本发明的覆盖层的实施例1具有非常均匀的厚度(±1μm)。此外,包括硬涂层的实施例1与不包括硬涂层的实例相比较,表现出较大的接触角,表明较好的耐污染性。
同时,对比实施例1具有相同的覆盖层形式,但不包括硬涂层,其具有错误状态的抖动值。这表明在划痕试验之后数据存储基质被大大地损害而不能读取数据。而且,相对小的接触角表明耐污染性差。
此外,在对比实施例2的情况中,采用旋涂法来涂布UV可固化组合物,厚度偏差严重(±20μm),并且从其抖动值和接触角明显看出耐擦伤性和耐污染性差。
根据本发明的包括硬涂层、包含塑料的基片和粘合剂层的覆盖层可应用于数据存储基质,更具体而言,可应用于蓝色激光波长下的光盘,以提供蓝色激光波长下的光盘的光学设计所要求的覆盖层的均匀厚度,和硬涂层可保护数据记录层免受擦伤和玷污。而且,包括覆盖层的蓝色激光波长下的光盘可替代常规带盒的蓝色激光波长下的光盘。
虽然参考本发明的示范性的实施方案已对本发明进行了具体的公开和描述,但本领域的普通技术人员应理解,在不脱离如所附权利要求所限定的本发明的精神和范围的情况下,其中可进行各种形式和细节的变化。
Claims (8)
1、一种数据存储基质的覆盖层,包括硬涂层、包含塑料的基片、和粘合剂层。
2、如权利要求1所述的数据存储基质的覆盖层,其中所述的硬涂层、包含塑料的基片、和粘合剂层的厚度分别为0.5~20μm、40~90μm和5~40μm。
3、如权利要求1所述的数据存储基质的覆盖层,其中所述的包含塑料的基片的材料选自包括聚碳酸酯、三乙酰纤维素和其混合物的组。
4、如权利要求1所述的数据存储基质的覆盖层,其中将保护片粘附在覆盖层的两表面上。
5、一种数据存储的基质,具有粘附到其表面上的权利要求1至3中任一项所述的覆盖层。
6、一种制备数据存储基质的覆盖层的方法,该方法包括:
将硬涂层材料涂布在包含塑料的基片的表面上,并使硬涂层材料固化;和
将包含粘合剂的粘合剂组合物涂布在所述包含塑料的基片的另一表面上。
7、如权利要求6所述的方法,该方法进一步包括将保护片粘附在所制备的覆盖层的两侧。
8、如权利要求7所述的方法,该方法进一步包括按数据存储基质的形状裁剪所制备的覆盖层。
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US20100112347A1 (en) * | 2007-03-30 | 2010-05-06 | Takashi Matsushita | Pressure sensitive adhesive for sunlight shielding films and sunlight shielding film |
CN103065649A (zh) * | 2012-12-31 | 2013-04-24 | 潮州市连思科技发展有限公司 | 一种可录式光盘的制备方法 |
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US8264942B2 (en) * | 2005-10-26 | 2012-09-11 | Hewlett-Packard Development Company, L.P. | Optical disc embossed features |
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US4983437A (en) * | 1989-04-21 | 1991-01-08 | Merrick Steven L | Compact disc protector |
US5609990A (en) * | 1995-02-08 | 1997-03-11 | Imation Corp. | Optical recording disk having a sealcoat layer |
WO2001070493A1 (fr) * | 2000-03-22 | 2001-09-27 | Asahi Glass Company, Limited | Film stratifie fonctionnel, son procede de production et ecran cathodique sur lequel est colle ledit film |
JP3560532B2 (ja) * | 2000-05-02 | 2004-09-02 | 株式会社巴川製紙所 | ディスプレイ用帯電防止フィルム |
JP2002123981A (ja) * | 2000-10-19 | 2002-04-26 | Nec Corp | 光学情報記録媒体、光学情報記録再生方法および光学情報記録再生装置 |
JP2002197737A (ja) * | 2000-12-27 | 2002-07-12 | Sony Corp | 光学記録媒体の製造方法 |
JP2002230387A (ja) * | 2001-02-05 | 2002-08-16 | Abia:Kk | 請求額用ポイント情報管理システム及びポイント情報管理装置 |
US6624564B2 (en) * | 2001-05-25 | 2003-09-23 | Chunghwa Picture Tubes, Ltd. | Antistatic/antireflective coating for video display screen with adjustable light transmission |
JP2003173574A (ja) * | 2001-12-04 | 2003-06-20 | Sony Corp | 光記録媒体およびその製造方法 |
JP3833934B2 (ja) * | 2001-12-20 | 2006-10-18 | 日本電産サンキョー株式会社 | 光ヘッド装置 |
JP4229613B2 (ja) * | 2002-01-09 | 2009-02-25 | リンテック株式会社 | 光ディスク用保護フィルム及びそれを用いた光ディスク |
TWI260004B (en) * | 2002-03-04 | 2006-08-11 | Ritek Corp | Write-once high-density CD-recordable layer structure and manufacturing method |
JP2004134050A (ja) * | 2002-08-14 | 2004-04-30 | Fuji Photo Film Co Ltd | 光ディスクのカバー層形成方法 |
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US20100112347A1 (en) * | 2007-03-30 | 2010-05-06 | Takashi Matsushita | Pressure sensitive adhesive for sunlight shielding films and sunlight shielding film |
CN101679824B (zh) * | 2007-03-30 | 2012-10-10 | 琳得科株式会社 | 遮阳膜用粘合剂以及遮阳膜 |
CN103065649A (zh) * | 2012-12-31 | 2013-04-24 | 潮州市连思科技发展有限公司 | 一种可录式光盘的制备方法 |
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US20050088957A1 (en) | 2005-04-28 |
EP1678717A1 (en) | 2006-07-12 |
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EP1678717A4 (en) | 2008-09-24 |
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