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CN1246850C - 一种光盘 - Google Patents

一种光盘 Download PDF

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CN1246850C
CN1246850C CNB021598371A CN02159837A CN1246850C CN 1246850 C CN1246850 C CN 1246850C CN B021598371 A CNB021598371 A CN B021598371A CN 02159837 A CN02159837 A CN 02159837A CN 1246850 C CN1246850 C CN 1246850C
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light
transmissive film
printing opacity
tack coat
forms
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CN1448931A (zh
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小岛竹夫
浅沼丰人
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JVCKenwood Corp
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Victor Company of Japan Ltd
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Abstract

本发明提供一种能够在高频率旋转领域修正聚焦误差的光盘及其制造方法。在基板2上依次层叠反射层3、记录层4、透光粘结层5和透光膜6，透光粘结层5与透光膜6的合计厚度为0.1mm，且透光膜6表面褶皱的高低差设定为2.5μm以内。而且，透光膜6在通过透光粘结层5粘结到记录层之前，要经过波长为250nm～300nm，能量为500mJ/cm2～3000mJ/cm2紫外线照射的退火处理。

Description

一种光盘
技术领域
本发明涉及一种在高转速下改善聚焦误差的具有一层或两层记录层的光盘及制作方法。
背景技术
在光盘领域，随着透镜的大口径化与激光的短波长化，正在朝高密度化发展。
在下一代光盘的记录重放装置之中，光盘因翘曲等原因与光拾波器的物镜和光盘表面间的距离成比例地倾斜时的透镜象差变得越发严重，因而有必要通过减少覆盖光盘表面的透光层的厚度来缩短上述物镜与光盘表面的距离，从而抑制透镜象差本身的发生量。
此外，也有必要把伴随光盘的表面振动的聚焦误差控制在规定值之内。
因此，若在基板上依次层叠记录层、粘结层，继而预先以对应于热变形温度的-20℃～+80℃的温度退火处理透光聚合物膜之后，再把该聚合物膜粘结到上述粘结层，由上述的粘结层与聚合物膜共同制作成透光层，则可减少该聚合物膜的褶皱，改善上述透光层的膜厚不均。此种光盘的制作方法已在专利文献1中公示。
在此，用图7对聚焦误差与光盘表面振动之间的关系加以说明。
下面，由于在数十KHz以上的变量之中还包含了用来自光盘的信息信号测定的间接变量成分，因而聚焦误差定为使用旋转频率在10KHz以下的数据。
图7表示重放时的线速度为5.3m/s时的光盘的表面振动量与光盘旋转频率之间的关系。
此种情况下，所示的虽是重放时的情况，其实，记录时的情况也一样。
图7的纵轴表示光盘的表面振动量，横轴表示光盘的旋转频率。而且两轴均为对数刻度。此外，所谓临界线R是指产生聚焦误差的临界线，位于临界线以下的区域可通过光拾波器的伺服电路进行表面振动修正，是聚焦正对准信息面的区域，而上侧区域则不可能用光拾波器的伺服电路修正表面振动，是聚焦不对着信息面的区域。在此，把下侧区域称之为聚焦可修正区域P，而把上侧区域称之为聚焦不可修正区域Q。
如图7所示，示出光盘表面振动量在光盘旋转频率为1到36Hz的(A)区、36Hz到1100Hz的(B)区、1100Hz到10000Hz的(C)区、各区内对频率的依赖关系。
在旋转频率为1至36Hz的(A)区，表面振动量为100μm以下时可进行聚焦修正。在旋转频率为36至1100Hz的(B)区，随着该旋转频率的升高而呈现出可聚焦修正的表面振动量直线下降。
即，旋转频率为36Hz时，可聚焦修正100μm以下的表面振动量，旋转频率为1100Hz时，可聚焦修正0.09μm以下的表面振动量。在旋转频率更高的1100Hz至10000Hz的(C)区，表面振动量为0.09μm以下时，可聚焦修正。
如上所述，在旋转频率升高的情况下，聚焦误差的修正只允许很小的值，由此可知，在图7的(C)区，若不能把表面振动量控制在0.09μm以下，就不能进行聚焦误差的修正。
(专利文献1)
特开2000-311392号公报(第3-4页第1图)
发明内容
然而使用特开2000-311392号公报揭示的制造方法制作的光盘仅能改善透光层的膜厚不均，在高频旋转时并不能把表面振动量控制在可进行聚焦误差修正的0.09μm以下。
因此，本发明正是为了解决上述问题而提出的，其目的在于，提供一种即使旋转在高频率区域仍可进行聚焦修正的光盘及其制作方法。
本发明的第一项发明提供一种光盘，在旋转的同时利用光拾波器记录、重放信息，其特征在于，包括：在基板上形成的第1反射层；在第1反射层上形成的第1记录层；在第1记录层上形成的第1透光粘结层；和在第1透光粘结层上形成的透光膜，上述透光粘结层和上述透光膜的合计厚度为0.1mm，且上述透光膜表面形成的褶皱的高低差为2.5μm或小于2.5μm，以将光盘旋转时的表面振动抑制到或低于特定的水平。
本发明的第2项发明提供一种光盘，其特征在于，包括：在基板上形成的第1反射层；在第1反射层上形成的第1记录层；在第1记录层上形成的第1透光粘结层；在第1透光粘结层上形成的透光膜，上述透光粘结层和上述透光膜的合计厚度为0.1mm，且上述透光膜表面形成的褶皱的高低差为2.5μm或小于2.5μm，和在第1透光粘结层与透光膜之间依次层叠的第2反射层、第2记录层和第2透光粘结层。
附图说明
图1是本发明实施方式的光盘剖视图。
图2是本发明实施方式的光盘制作装置的俯视图。
图3是图2沿LL线的剖视图。
图4是图2沿MM线的剖视图。
图5是图2沿NN线的剖视图。
图6是表示本发明实施方式的变形例光盘的剖视图。
图7是表示重放时的线速度为5.3m/s时光盘表面振动量与光盘旋转频率间的关系。
具体实施方式
下面用图1至图6说明本发明实施方式的光盘及其制作方法。
图1是本发明实施方式的光盘剖视图。
图2是本发明实施方式的光盘制作装置的俯视图。
图3是图2沿LL线的剖视图。
图4是图2沿MM线的剖视图。
图5是图2沿NN线的剖视图。
图6是表示本发明实施方式的变形例光盘的剖视图。
如图1所示，本发明实施方式的光盘1由在具有中心孔0，由聚碳酸脂构成的圆盘形光盘基板2的信息面2a上，依次层叠的由金属构成的反射层3；由Ge-Sb-Te构成的记录层4；由紫外线固化树脂构成的透光粘结层5；及以透光膜6构成。
透光粘结层5与透光膜6共同构成透光层7，该透光层7的厚度为0.1mm。
在光盘基板2的信息面2a之上，形成着有凹凸形状的信息坑或槽。且该光盘基板2的外径为Φ120mm、内径为Φ15mm。透光膜6的厚度为90μm、外径为Φ119mm、内径为Φ20mm。透光粘结层5的材料，作为一例，可使用由大日本油墨公司生产的紫外线固化树脂EX8204。
此外，为了能够在以线速度5.3m/s记录重放时修正聚焦误差，透光层7的厚度定为0.1mm，而且透光膜6的表面褶皱的高低差被控制在2.5μm以内。
该光盘1通过从透光膜6一侧射入激光进行记录重放。
下面将图2至图5结合到图1之中来说明本发明实施方式的光盘制作方法。
首先说明图2至图5所示的制作装置9。
在此把在光盘基板2上依次层叠了反射层3、记录层4的基板称之为层叠基板8。
制作装置9由下述各部分构成：放置层叠基板8的基板供给装置10，安装由透光膜6与保护膜11一体形成的膜胚带12(参照图2、图3)，将透光膜6从保护膜11剥离后供给的供膜装置13，卷绕供膜装置13供给的透光膜6的膜卷绕装置14。
在供膜装置13与膜卷绕装置14之间，由把透光膜6切割成与层叠基板8同样大小的盘状膜的切割装置15，传送切割下来的透光膜6的第1传送装置A，放置由第1传送装置A传送来的透光膜6的膜平台16，从基板供给装置10传送层叠基板8的第2传送装置B，往由第2传送装B传送到旋转平台18上的层叠基板8上涂布紫外线固化透光粘结层5的旋转装置17构成。
此外，还由以下部分构成：一起传送膜平台16与透光膜6或者用后述的紫外线照射透光膜后把膜平台16恢复到初始位置的第3传送装置C，和传送放置于旋转装置17的旋转平台18之上的层叠基板8以及与之一体化了的透光膜6，或者把紫外线照射后的透光膜6传送到旋转平台18之上的第4传送装置D。
以及由用紫外线照射由第3传送装置C传送到旋转平台18之上的透光膜6，或用紫外线照射与层叠基板8一体化的透光膜6的紫外线照射装置20，用于传送通过紫外线照射使透光膜6与层叠基板8一起固化而制成的光盘的第5传送装置E，和用于收存光盘1的收存装置21构成。
此外如图2及图4所示，旋转装置17还由下述各部分构成：中央部位具有与层叠基板8的内径相同直径的中心轴22以及以该中心轴的22的外径为导向在层叠基板8上设置有衬套23的圆板状旋转平台18，以及在尖端形成喷出透光粘结层5的喷咀24，另一端固定在固定件25之上，在旋转平台18之上进行往返运动的传送臂26，用于在边旋转旋转平台，边往层叠基板8上涂布透光粘结层5时，收容因旋转的离心力，呈放射状向四周飞散的多余粘接层5，围在旋转平台18外围的涂层收容罩27。
如图5所示，紫外线照射装置20由用于放置涂布了透光粘结层5的层叠基板8的旋转平台19，用于照射放置在该旋转平台19之上的层叠基板8以及照射透光膜6的紫外线灯28构成。该紫外线灯28是高压水银灯、金属卤化物灯等。
而第1、2、3、4、5传送装置A、B、C、D、E分别以X为中心在其周围，按规定的角度朝箭头方向转动。
下面就使用制造装置9制作光盘1的方法加以说明
(透光膜切割工序)
启动供膜装置13，把膜从保护膜11上剥离之后提供给膜卷绕装置14，并在此处卷绕。接着通过配置于供膜装置13与卷绕装置14之间的膜切割装置15，把透光膜6切割成与层叠基板8同样大小，形状盘形的透光膜6。
此时，保护膜11可用未图示的卷绕装置卷绕。
(透光膜的紫外线照射工序)
下面用第1传送装置A，把透光膜6放置于膜平台16上之后，用第3传送装置C，把膜平台16与透光膜6传送并放置到紫外线照射装置20的旋转平台19上。
其后，一边按规定的转速旋转旋转平台19，一边用紫外线照射装置20的紫外线灯28射出的第1紫外线，以第1种能量照射透光膜6。
在此对可减少透光膜6的褶皱加以说明。
由于透光膜6具有吸收波长在250nm～300nm的紫外波段的分子晶格，因而若用该波长区域以及500mJ/cm2～3000mJ/cm2的第1种能量的第1紫外线照射，即使产生褶皱，由于能利用第1紫外线的退火作用缓解内部应力，使之逐渐恢复原有的特性，因而能够减少褶皱的阶差。此时，若第1能量处于500mJ/cm2以下时，由于没有退火作用，透光膜6上会出现很大的褶皱。而在第一种能量处于3000mJ/cm2以上时，由于热变形，透光膜6上也会出现很大的褶皱。因而有必要把第1能量设定为500mJ/cm2～3000mJ/cm2。
其后，用设置于第4传送装置D的未图示的吸取装置吸取透光膜6，处于待机状态。同时，通过第3传送装置C使膜平台16恢复原位。
(基板准备工序)
另一方面，将事先准备好的层叠基板8，记录层朝上放置到基板供给装置10之上。
(往层叠基板上涂布透光粘结层的涂布工序)
利用第2传送装置B，将层叠基板8从基板供给装置10转送并放置到旋转装置17的旋转平台18上。一边使旋转平台18按规定转速旋转，一边把传送臂26朝旋转平台18方向移动，从喷咀24把紫外线固化型的透光粘接层5滴到层叠基板8的记录层4之上。
当滴到层叠基板8的记录层4之上的透光粘结层5达到适当的覆盖量时，停止旋转平台18和透光粘结层5的供给。然后使传送臂26恢复原位。
(粘结工序)
其后，启动第4传送装置D，把经紫外线照射过的透光膜6通过透光粘结层5放置到在旋转装置17的旋转平台18上放置的层叠基板8之上。此时，把距紫外线灯28最近的透光膜6面作为表面。其结果，由于透光膜6的自重，而使透光粘结层5延伸。当延伸到最佳位置时，使旋转平台18高速旋转。此时，作为旋转平台18的旋转条件，可通过选择时间及转速，使透光膜6与透光粘结层5的厚度成为0.1mm。
此处的转速为5000rpm，旋转时间为15s。
此外，呈放射状朝四处飞散的多余的透光粘结层5，被收容到涂层收容罩27之中。
这样，即可把透光膜6通过透光粘结层5粘结到层叠基板8之上。
此时，由于已经用波长范围为250nm～300nm、第1种能量为500mJ/cm2～3000mJ/cm2的紫外线，对透光膜进行过照射退火，而且透光粘结层5的粘性很低，因而即使透光膜6有褶皱，也能渗透到褶皱的各个角落，可把粘结时的凹凸控制在最小范围。
(紫外线照射固化工序)
下面，用第4传送装置D，将通过透光粘结层5把透光膜6粘贴到层叠基板8上，，已成为一体的板传送到紫外线照射装置20旋转平台19之上。使透光膜6朝上放置。
接着一边使旋转平台19旋转一边通过从透光膜6上方用紫外线灯28，以与第1种能量相同的500mJ/cm2～3000mJ/cm2的第2种能量照射第2紫外线，使透光粘结层5固化，使层叠基板8与透光膜6完全粘结，从而得到图1所示的光盘1。然后停止旋转平台19的旋转。
此时，第2紫外线的波长只要在250nm～400nm的范围内即可。
此外，由于第2种能量只要能使透光粘结层固化即可，因而没有必要与第1种能量完全相同，小一些也可以。若把第2种能量设定为与第1种能量相同，因其可以边抑制透光膜6产生褶皱边粘结，因而可减少褶皱的高低差。
(光盘收存工序)
下面通过第5传送装置E，把光盘1从旋转平台19传送到收存装置21并收存其中。
接着，使照射透光膜6的第1紫外线的第1种能量在500mJ/cm2～3000mJ/cm2的范围内变化，制作多个试样1～4。调查照射单面或双面时的聚焦误差。此时，为了作比较，还制作了比较试样1～3。
透光膜6的褶皱的高低差的好坏，以光盘1高频率旋转时可修正聚焦误差的极限值-表面振动量0.09μm作为判断标准。即，褶皱的高低差，表面振动量为0.09μm以下时定为好，0.09μm以上时定为坏。
表面振动量的测定采用芝测制的记录重放装置LM330A进行，透光膜6的褶皱高低差的测定则用表面粗度仪(岛津制作所制、粗糙度检查仪)进行。
此时的光盘1的测定，采用了半径23mm的位置，线速度5.3m/s进行。照射透光膜6的第1紫外线具有250nm～300nm的波段范围。
测定结果如表1所示。
表1
试样编号   紫外线照射面   紫外线照射能量(mJ/cm2)   褶皱高低差(μm)   表面振动量(μm)
  试样1试样2试样3试样4   单面单面单面双面   500150030001500   2.51.81.01.8   0.0850.0510.0330.051
  对比试样1对比试样2对比试样3   单面单面单面   04003500   5.34.03.0   0.180.160.23
表1中所列的褶皱高低差是指形成于透光膜6表面的褶皱的最大高低差。照射透光膜6的紫外线能量(第1种能量)设定为试样1、500mJ/cm2，试样2、1500mJ/cm2，试样3、3000mJ/cm2，试样4、1500mJ/cm2，对比试样1、0mJ/cm2，对比试样2、400mJ/cm2，对比试样3、3500mJ/cm2。试样1～3以及对比试样1～3为紫外线单面照射透光膜6，试样4则是双面照射透光膜6。
正如表1所示，褶皱的高低差，试样1为2.5μm，试样2为1.8μm，试样3为1.0μm，试样4为1.8μm，与之相对应的对比试样1～3，则均在2.5μm以上。
此外再来看表面振动量，试样1为0.085μm，试样2为0.051μm，试样3为0.033，试样4为0.051μm，与之相对应的对比试样1～3则均在0.09μm以上。
试样1～4的褶皱的高低差均为2.5μm以下。其原因可以认为是因为第1紫外线的退火作用大大缓解了透光膜6的内部应力。
从该试验结果可知，若把透光膜6的褶皱的高低差设定为2.5μm，把照射它的第1紫外线的波长设定为250～300nm，把第1种能量设定为500mJ/cm2～3000mJ/cm2，即能够把表面振动量控制在可进行聚焦误差修正的0.09μm以下。
如上所述，依据本发明的实施方式，由于透光粘结层5与透光膜6的合计厚度为0.1mm，而且把透光膜6的褶皱的高低差设定为2.5μm以内，因而可获得表面振动量为0.09μm以下，可进行聚焦误差修正的光盘1。
此外，依据本发明实施方式的制造方法，由于在通过透光粘结层5与把透光膜6粘结到层叠基板8上之前对透光掩6进行紫外线照射，采用波段为250nm～300nm，第1种能量处于500mJ/cm2～3000mJ/cm2范围的第1紫外线，因而可以把透光膜6的褶皱的高低差控制在2.5μm以下。
下面作为本发明的实施方式的变形例，用图6说明记录层为两层的双层光盘。
与本发明的实施方式结构相同的部分采用同样的标号并省略其说明。
双层光盘29的结构为：依次层叠具有中心孔O的由聚碳酸脂构成的光盘基板2，在该光盘基板2的信息面2a上的第1反射层30，第1记录层31，第1透光粘结层32，第2反射层33，第2记录层34，第2透光粘结层35，以及透光膜6。且第2反射层33为半透明膜。此外，在第1透光粘结层32之上，使用透明模具以2P形成法(PhotoPolymerizafion：光聚合作用)形成与信息面2a不同的未图示的又一个信息面。
而且，这种情况下也一样，由第2透光粘结层35与透光膜6共同构成透光层7，该透光层的厚度为0.1mm。
此外，第1以及第2记录层31、34的材料与实施方式中的记录层4的材料相同，第1以及第2透光粘结层32、35的材料与实施方式中的透光粘结层5相同。
发明效果
依据本发明，在基板上依次层叠反射层、记录层、透光粘结层、透光膜，由于上述透光粘接层与上述透光膜的合计厚度为0.1mm，而且上述透光膜的表面褶皱的高低差为2.5μm以内，因而能把表面振动控制在0.09μm以内，能够进行聚焦误差修正。
此外，该光盘的制作方法由下述工序构成：以第1能量，用第1紫外线照射透光膜的照射工序，预先准备在表面依次层叠了反射层、记录层的基板的准备工序，在上述基板的记录层上涂布紫外线固化透光粘结层的涂布工序，把上述透光膜放置于上述透光粘结层上的放置工序，从上述透光膜上方以第2种能量用第2紫外线照射，使上述透光粘结层固化，粘结上述基板与上述透光膜的粘结工序；由于上述第1紫外线的波长为250nm～300nm，上述第1种能量为500mJ/cm2～3000mJ/cm2，因而可把透光膜的褶皱的高低差控制在2.5μm以下。

Claims (3)

1.一种光盘，在旋转的同时利用光拾波器记录、重放信息，其特征在于，包括：
在基板上形成的第1反射层；
在第1反射层上形成的第1记录层；
在第1记录层上形成的第1透光粘结层；和
在第1透光粘结层上形成的透光膜，上述透光粘结层和上述透光膜的合计厚度为0.1mm，且上述透光膜表面形成的褶皱的高低差为2.5μm或小于2.5μm，以将光盘旋转时的表面振动抑制到或低于特定的水平。
2.一种光盘，其特征在于，包括：
在基板上形成的第1反射层；
在第1反射层上形成的第1记录层；
在第1记录层上形成的第1透光粘结层；
在第1透光粘结层上形成的透光膜，上述透光粘结层和上述透光膜的合计厚度为0.1mm，且上述透光膜表面形成的褶皱的高低差为2.5μm或小于2.5μm，和
在第1透光粘结层与透光膜之间依次层叠的第2反射层、第2记录层和第2透光粘结层。
3.根据权利要求1所述的光盘，其中，表面振动的特定的水平为0.09μm。
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