CN1097259C - 光学信息记录媒体及其制造方法 - Google Patents
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Abstract
一种光学信息记录媒体，具有一用来光学读出信息信号的反射层。它包括一塑料基片。该基片用染料着色，使得记录在该媒体上的信息种类可以一眼看出，而无论该信息是诸如游戏程序，音乐信息，还是其它类信息。通常，当在基片中混有染料等杂质时，读出器的光学系统会受到影响，不能容易地读出数据。由于染料的颗料减小到50μm，所以消除了对光学系统的影响。
Description
本发明涉及一种通过激光来光学地读出信息信号的信息记录媒体，具体来讲涉及这样一种光学信息记录媒体，其通过对其着色，可采用目视检查当即确定其种类或用途。
在所谓的CD(压缩光盘)中，那些其上数字记录了音频信号的CD目前十分盛行。最近，开发了一种其上记录了计算机程序或数据的所谓CD-ROM(只读光盘)，增加了CD的种类及其应用领域。
随着CD种类和应用的增加，产生了对CD进行辨别区分的装置的需要。例如，如果根据CD的种类和用途为CD赋予不同的颜色，那么用户便可很快地对CD作出辨别。
为CD上色，最简单容易的方法是为塑料基片着上有色物质。
在为塑料着色的方法中，已知这样一种方法，在该方法中预备一着色的化合物，随后用一制模装置制造一着色的模制物。还有其他已知的方法，例如：一种方法包括将称作干颜料的粉末状着色剂与无色的树脂混合(干混法)并使混合产物散布于制模装置中以产生一着色的模制物；一种方法包括采用一种无色的树脂稀释一着色剂，并采用所得到的着色剂来着色，其中这种着色剂是通过扩散高密度的染料或颜料即所谓的母料而得到的；以及一种称作液体着色的方法，包括将染料扩散于液体装置中，并采用泵定量地提供所得到的糊状着色剂。
通常，染料很容易溶于塑料且扩散性很好。因而，采用市面上的染料通过干混法可以得到令人满意的着色模制品。
然而，由于CD不但对表面而且对各种光学性能有要求，因此上述方法的简单应用不足以得到满意的效果。
本发明的目的是提供一种光学信息记录媒体，该种媒体着上了颜色，可以立即识别出其种类及用途等等，并具有优越光学性能。本发明的另一目的是提供一种生产这种光学信息记录媒体的方法。
为实现上述目的，本发明人长期从事研究并得出结论，混合在塑料基片中的着色物质颗粒的大小在光学信息记录媒体重放数据时，严重影响着错误率。
本发明便是基于这一概念而完成的。即，本发明提供一种光学信息记录媒体，其包括一由着色物质混合物着色的塑料基片，和一信号记录部分，从信号记录部分中可光学地读出信息信号，其中混入塑料基片的着色物质颗粒的大小不超过50μm。
本发明还提供一种制造光学信息记录媒体的方法，包括下列步骤：将着色物质扩散于扩散性媒体中以产生液体着色物质；将液体着色物质通过一过滤器以去除粗大颗粒，所得到液体着色物质的最大染料尺寸不超过50μm；并将液体着色物质提供给一注射制模装置的树脂注射进料器，以注射成型塑料基片。
在本发明中用来为塑料基片着色的例如染料的着色物质所要求的基本特性是对作为塑料基片材料的聚碳酸脂成模温度的耐受能力，及得到所需要的颜色的能力。最重要的是染料在聚碳酸脂中的完全溶解和扩散。然而，取决于不同的染料种类，染料有时以固体颗粒形式残留下来。如果出现了这种固体颗粒，便会产生各种诸如错误率增加的与CD性能有关的不利影响。
为解决上述问题，本发明人进行了多种研究且发现，如果在聚碳酸脂中的染料固体颗粒大小为近似μm，则会产生上述不利影响。本发明人为解决这一问题进行了许多探索。
这些方法包括：
(1)在普通染料与聚碳酸脂干混情况下用注射成模设备加强搅拌，用来加速染料溶解，并制成最终物质的方法；
(2)采用挤压机制备着色化合物并成形最终着色化合物的方法；及
(3)制备染料母料并成形母料的方法。
即使采用上述方法得到的CD的性能比简单的干染料混合得到的CD性能有少许改进，但还是不够的。可能的原因是，对于上述方法(1)，会产生由于干染料的分散而造成的污染。最主要的不利之处是加强搅拌会降低生产率和经济性。
对于方法(2)，聚碳酸脂分子量的增加会影响性能且由于污染造成废料率的增加。对于方法(3)，存在母料不稳定稀释和污染的问题。
本发明者对一种通过在液体溶剂中扩散染料得到一种糊状着色物质，并将所得到的着色物质注射入制模装置的一较低部分成型的方法，进行了调研。
采用这种被调研的方法，通过三个辊子将多种染料扩散于一种溶剂中并在糊状下使用。该方法制得的CD的废料率约为90％，是一个不可接受的值。可能的原因是在着色物质内的部分染料没有充分溶解，并作为尺寸为100μm或者更大的缺陷留在聚碳酸脂内，它由作为核心的粗大颗粒及外围的半溶解的周围部分组成。
为解决这种缺点，着色物质由40μm或更小的染料扩散颗粒形成，且CD以同样方式来模制以检查废料率。发现得到的废料率不超过5％。本发明是基于这些结果得到的。
同时，根据本发明需要的着色物质的染料颗粒的大小随染料种类的不同而不同。可能的起作用的因素在于染料与聚碳酸脂的相容性及染料的熔点。例如，对于溶剂R.135一种perinon基的染料就很难与CD的特性相适应。可能的原因是由于染料的溶点为307℃，接近或高于聚碳酸脂的制模温度，因而不能得到满意的扩散。总之，最好采用这样的方法，在模制CD的聚碳酸脂基层中应不出现染料固体颗粒，或者至少其固体颗粒尺寸不大于50μm。
根据本发明，可采用诸如颜料或染料等可选的着色物质。实际中最好使用染料(dyestuff)。可采用的染料包括蒽醌、杂环族化合物、次甲基、pelynon、pelylene或硫靛基染料。如果除了上述特性之外，同时考虑可能对金属模具造成的污染的升华性，蒽醌基的染料可以是溶剂红52，溶剂红149，溶剂蓝94和溶剂绿3。杂环族化合物基的染料可以是溶剂黄33，溶剂黄54和溶剂黄105。次甲基基的染料包括溶剂黄93和溶剂橙80。pellynon基染料可以是溶剂橙60和溶剂红135。pellylene基的染料可以是溶剂绿5。最佳的硫靛基染料包括还原红1。这些可单独或者混合使用。
根据本发明，诸如上述染料的着色物质最好扩散在溶剂中，以便在液体着色物质状态下使用。使用的溶剂包括高沸点有机溶剂和增塑料剂。作为溶剂所需的基本性能包括耐受约300～350℃制模温度的能力，不造成聚碳酸脂分子量下降的能力，以及不影响模制CD的诸如抗压强度，热变形温度、开裂或收缩等机械性能，更不用说要有作为染料的适应性，即安全性，染料扩散稳定性及通过泵供给的可测量性。
从上述原因，考虑到可用性，花费和各种物理性能，最好选用增塑剂。这些溶剂可单独或者结合使用，对此无限制。
作为增塑剂的例子有苯二酸酯基增塑剂，如邻苯二甲酸二异癸酯(DIDP)或邻苯二甲酸十三烷基酯(DTDP)；环氧树脂基增塑剂，如环氧化豆油(ESO)，4、5-环氧环己烷-1、2-二羧酸-2-乙基己基(E-PS)，4、5-环氧环己烷-1、2-二异癸酯，油酸缩水甘油酯，9、10-环氧硬脂酸烯丙基，9，10-环氧硬脂酸-2-乙基己基，环氧牛脂(toll)油脂肪酸-2-乙基己基和双酚A缩小甘油醚；磷酸酯基增塑剂，如磷酸三丁酯(TBP)，磷酸三苯酯(TPP)，甲苯基二苯基磷酸酯或磷酸三丙二醇酯；脂肪酸酯基增塑剂，如硬脂酸丁酯(BS)，乙酰蓖麻酸甲酯(MAR)或乙酰蓖麻酸乙酯(EAR)；增塑剂，如偏苯三酸三辛酯，偏苯三酸酯，二己戊四醇酯或苯四酸酯；和聚酯基增塑剂，如聚(丙二醇，己二酸)酯，聚(1、3-丁二醇，己二酸)酯，聚(丙二醇，癸二酸)酯，聚(1、3-丁二醇，癸二酸)酯，聚(丙二醇，苯二甲酸)酯，聚(1、3-丁二醇，己二酸)酯，聚(乙二醇，己二酸)酯或聚(1、6-己二醇，己二酸)酯。
添加添加剂也可有效地改善溶剂的扩散和存放的稳定性。
本发明可应用于任何光学信息记录媒体，用来读出信息信号。例如，其可应用于光盘，如CD或CD-ROM，其中在光盘的塑料基片上形成有以凹陷和平台(land)形式的信息凹坑(Pit)，且还有一作为信号记录部分的反射层。
虽然在上面的描述中使用聚碳酸酯作为塑料基体的材料，但除了聚碳酸酯，其他任何合适的塑料材料均可使用。
在使用染料等着色物质为诸如CD的光学信息记录媒体的塑料基体上色时，如果混合着色物质颗粒的尺寸超过50μm，则得到的光学记录媒体的光学性能恶化，使得当重放其上的数据时，错误率将增大。相反，如果混合着色物质颗粒的尺寸不超过50μm，光盘将保持足够好的光学性能，便有可能使错误率升高造成的废料率下降。
根据本发明，由于混合入塑料基片的染料的颗粒尺寸被优化，因而有可能得到这样的光学信息记录媒体，通过其颜色可立即识别出其种类和用途，且其具有优良的光学性能。
至于染料的混合比，0.05～0.2克的染料对14.5～17.0克的塑料基片材料较适于实现方便盘色目视鉴别的目的。尽管根据用途，染料添加量可超过这一范围，但塑料基片本身将变脆。
图1是根据本发明实施例制备的光盘主要部分的截面简图。
下文将参照示例性的实验结果详细介绍本发明。(1)纯化染料的方法
采用索格利特萃取器(Soxhlet extractor)对染料进行纯化。由TOYO ROSHI CO.LTD.生产的圆柱状滤纸作为过滤器，并设置-325-网眼(mesh)的不锈钢屏。染料的纯化采用甲基氯化合物作为萃取溶液，将罩式加热器调整至55℃，反复回流来去除杂质及异物。被纯化的染料的结晶颗粒从圆底烧瓶取出，并在5℃条件下干燥8小时以去除甲基氯化物，得到纯净染料。(2)染料颗粒的粉碎和扩散
由染料纯化方法(1)生产的染料以任选比例(重量比)与增塑剂(聚丙烯增塑剂)预混合，染料颗粒经三个辊子粉碎后进行扩散。粉碎的程度通过调节辊间缝隙及染料经过辊子的次数来确定。扩散颗粒尺寸大小按照JIS K5400，4-4方法进行测量。(3)糊状着色物质的过滤
在对染料颗粒进行粉碎和扩散步骤(2)后得到的糊状着色物质经过由TOYO ROSHI公司生产的200-网眼过滤器进行过滤。(4)着色方法
着色部分安装在这样一位置，在该处初始的树脂材料(聚碳酸酯)从安装在制模装置挤压器上部的进料斗向下提供，经过滤糊状着色物质步骤(3)得到的糊状着色物质与初始树脂材料混合。着色物质通过一测量部分预先测取一给定量并由一安装在进料斗下部的喷嘴注射。注射的着色物质添加入经由进料斗的初始树脂材料的聚碳酸酯，从而被导挤压器内。添加了着色物质的初始树脂材料的聚碳酸酯树脂经过挤压器内的场(yield)部分，压缩部分和测量部分，并经过搅拌成为颜色均匀的着色初始材料注射入金属横内。(5)所制备的光盘的结构
采用注射成型的聚碳酸酯基底制备的光盘的结构如图1所示。
通过在具有以凹陷和平台形式形成的信息凹坑2a的聚碳酸酯基片2上形成反射层3和在其上形成UV硫化(Curable)树脂保护层4来制备光盘1。保护层4具有作为印刷表面的表面4a。(6)光盘的评估
如果混入染料为CD着色，根据染料颗粒尺寸的大小，未溶解和扩散于聚碳酸酯中的染料作为异物以块状的形式存在于聚碳酸酯基片中。当从CD上重放数据时，这些异物便挡住了激光使其不能读出记录在CD的信号表面上的凹坑，于是便不能对数字信号进行正确的再现。
例如，如果基片中出现大尺寸的染料颗粒，在CD播放器中产生的错误如表1所示。
表1
| 条件 | C1错误(峰值) | C2错误 |
| 无异物 | 15～30/秒 | 0 |
| 有异物 | 220/秒或更大 | 1或更大(实际数字为105～273) |
在从CD上读出记录的信号时，如果异物或者损伤阻碍了信号的读出，在CD播放机内部提供了一纠错电路进行错误纠正处理。建立纠错电路用来纠正主要由交叉交织Reed-Solomn码(CIRC)的C1码造成的随机错误，并纠正由CD播码造成的较大缺陷的突发式错误。
在解码过程中纠正的错误列于C1和C2栏中，分别表明了每秒内的平均值及每秒内的实际错误数目。
CD播放机(商业名称：CDP-3000)经过改型，计量由CIRC解码器输出的C1和C2标识的发生次数，用来得到C1和C2错误的值。
没有异物的样品(O Ce-错误)被视为满意，且评估是基于满意样品的结果来进行的。(7)示例性染料成份
根据所述的染料纯化方法(1)所得到的三种染料按表2所示的重量比混合。根据所述的染料的粉碎及扩散方法(2)，调节染料经过辊子的次数及辊间隙，并使用研磨量具，制造出具有最大颗粒尺寸80μm，60μm，50μm和40μm的糊状着色物质的多个样品。
表2
| 染料 | 组成 |
| PlastronRed 8350(蒽醌基染料，由ARIMOTO KAGAKU KOGYO公司制造) | 43重量组分 |
| Mitsni PSGreen BH(蒽醌基染料，由MITSUT TOATSU SHA制造) | 55重量组分 |
| Dia-Resin YellowF(杂环基染料，由MITSVBISHI KASEI SHA制造) | 2重量组分 |
由在糊状着色物质中的过滤中所述的方法(3)过滤得到的着色物质样品第1、2、3和4号根据在上述着色方法(4)中所述的方法模制成CD基片。模制成的CD为沥青黑色。
图1中所示的光盘样品是采用不同的基片制成，且根据上述评估方法进行评估。成品率分别为40％、70％、90％和95％，且对于染料颗粒尺寸不超过50μm的基片，可得到满意的超过90％的成品率。
如前文对本发明的描述，根据诸如(1)的光学信息记录媒体的不同的种类和用途，通过向其塑料基片中混入着色物质可以立即识别出该光学信息记录媒体的种类及用途。同时，通过优化混合入塑料基片的着色物质的颗粒尺寸，可得到满意的光学特性。
Claims (5)
1.一种光学信息记录媒体(1)，包括通过混合着色物质而着色的一塑料基片(2)和可光学地读出信息信号的信号记录部分，
其中混入塑料基片(2)的着色物质颗粒的尺寸不超过50μm。
2.根据权利要求1所述的信息记录媒体(1)，其中所述信号记录部分包括在所述塑料基片(2)上以凹陷和平台形式形成的信息凹坑(2a)，并在其上形成有一反射层(3)。
3.根据权利要求1所述的信息记录媒体(1)，其中所述塑料基片(2)由聚碳酸酯形成。
4.根据权利要求1所述的信息记录媒体(1)，其中所述的着色物质为一种染料。
5.一种用来制造光学信息记录媒体的方法，包括以下步骤：将着色物质扩散于扩散介质中以产生液体着色物质；将所述的液体着色物质通过过滤器以除去其中的粗大颗粒，用来得到着色物质最大颗粒尺寸不超过50μm的液体着色物质；将所述液体着色物质提供给一注射成型装置的树脂注射进料斗，用来注射成型一塑料基片；和在具有以凹陷和平台形式形成的信息凹坑的塑料基片上形成一反射层。
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| JPH04271031A (ja) * | 1991-01-17 | 1992-09-28 | Pioneer Electron Corp | 光記録媒体 |
-
1994
- 1994-10-27 JP JP6264282A patent/JPH08124212A/ja active Pending
-
1995
- 1995-10-25 CN CN95191092A patent/CN1097259C/zh not_active Expired - Lifetime
- 1995-10-25 KR KR1019960703454A patent/KR100387063B1/ko not_active IP Right Cessation
- 1995-10-25 MX MX9602322A patent/MX9602322A/es unknown
- 1995-10-25 DE DE69526066T patent/DE69526066T2/de not_active Expired - Lifetime
- 1995-10-25 ES ES95935561T patent/ES2171197T3/es not_active Expired - Lifetime
- 1995-10-25 US US08/666,481 patent/US5840395A/en not_active Expired - Lifetime
- 1995-10-25 WO PCT/JP1995/002190 patent/WO1996013834A1/ja active IP Right Grant
- 1995-10-25 AU AU37535/95A patent/AU710022B2/en not_active Ceased
- 1995-10-25 AT AT95935561T patent/ATE215257T1/de active
- 1995-10-25 DK DK95935561T patent/DK0737965T3/da active
- 1995-10-25 EP EP95935561A patent/EP0737965B1/en not_active Expired - Lifetime
- 1995-10-26 MY MYPI95003218A patent/MY116381A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CN1137837A (zh) | 1996-12-11 |
| AU710022B2 (en) | 1999-09-09 |
| US5840395A (en) | 1998-11-24 |
| EP0737965B1 (en) | 2002-03-27 |
| KR970700355A (ko) | 1997-01-08 |
| WO1996013834A1 (fr) | 1996-05-09 |
| ATE215257T1 (de) | 2002-04-15 |
| AU3753595A (en) | 1996-05-23 |
| DE69526066T2 (de) | 2002-10-31 |
| JPH08124212A (ja) | 1996-05-17 |
| KR100387063B1 (ko) | 2003-08-14 |
| DE69526066D1 (de) | 2002-05-02 |
| ES2171197T3 (es) | 2002-09-01 |
| DK0737965T3 (da) | 2002-06-17 |
| MY116381A (en) | 2004-01-31 |
| EP0737965A4 (en) | 1997-10-22 |
| EP0737965A1 (en) | 1996-10-16 |
| MX9602322A (es) | 1997-04-30 |
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Owner name: XINLI OPTIC DISC TECHNOLOGY CO., LTD. Free format text: FORMER NAME OR ADDRESS: SONY DISC TECHNOLOGY INC. PREFECTURA DE KANAGAWA |
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Correction item: Patentee Correct: Sony Disc and Digital Solutions Inc. False: Sony Disc Technology Inc. Number: 15 Volume: 22 Correction item: Address Correct: Tokyo, Japan, Japan False: Tokyo, Japan, Japan Number: 15 Volume: 22 |
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Correction item: Patentee Correct: Sony Disc and Digital Solutions Inc. False: Sony Disc Technology Inc. Number: 15 Page: The title page Volume: 22 Correction item: Address Correct: Tokyo, Japan, Japan False: Tokyo, Japan, Japan Number: 15 Page: The title page Volume: 22 |
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Free format text: CORRECT: PATENTEE ADDRESS; FROM: XINLI OPTIC DISC TECHNOLOGY CO., LTD. TOKYO, JAPAN TO: SONY DISC +DIGITAL SOLUTIONS TOKYO, JAPAN |
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