CN1144373A - 多层光盘 - Google Patents

多层光盘 Download PDF

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CN1144373A
CN1144373A CN96107289A CN96107289A CN1144373A CN 1144373 A CN1144373 A CN 1144373A CN 96107289 A CN96107289 A CN 96107289A CN 96107289 A CN96107289 A CN 96107289A CN 1144373 A CN1144373 A CN 1144373A
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information storage
wavelength
layer
light beam
information
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CN1092381C (zh
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金子正彦
梅津畅彦
荒谷胜久
中冲有克
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Sony Corp
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Abstract

本发明为一种多层光盘，具有一个使用通用重放装置，如CD唱机也能被重放的信息存储层并且使用一个专用重放装置能从其他信息存储层读取信息。根据本发明具有多个信息存储层的多层光盘包括多个信息存储层，其中多个信息存储层的其中之一对于重放光束的第一波长770nm至830nm的反射因数为70％或更高，而其他的信息存储层由具有与重放光束的第一波长不同的第二波长的重放光束重放。

Description

多层光盘
本发明涉及能处理大容量信息的用于存储信息的由多重层组成的多层结构的多层光盘。
近年来，所谓的多媒体的普及导致处理大容量信息例如数字动画的必要。因此，在需要时，有必要存储上述的大容量信息并能任意存取使其能被重放。
光盘是一个能够任意存取，具有大容量并能从再生装置弹出(为可移动的)的存储介质。因此，在大量的各种领域中可以使用光盘。为提高如上所述的容量，光盘的一面必须能够处理大容量信息。
在上述情况中，光盘的容量已经通过沿光盘的厚度方向分层设置存储信息的多重层的方法来提高。
多层光盘具有在其一面形成的由存储信息的信息层组成的多层结构，其中在多层中焦点互不相同使信息在保持任意存取特性时被读取，因此，大容量的光盘能处理大容量信息。
下面描述已有的典型的多层光盘。
1.通过使焦点的位置互不相同重放光盘的构思(参考，如美国专利No.3,946,367)。
2.使用在盘的一面上具有由多个分层而形成信息层的多层光盘使信息通过发射光束或反射光束来读取的方法(参考，如美国专利No.4,219,704)。
3.从多层光盘重放信息的系统，该系统包括具有象差修正功能的光学系统(参考美国专利No.5,202,875)。
为重放上述的传统的多层光盘，需要一个用于重放光盘的专用装置。例如，要求重放光系统能够独立地从第一信息存储层或第二信息存储层不相混淆地重放一个重放信号。作为这种要求的一种替换，要求信号处理系统能够互相区分第一信息存储层和第二信息存储层的重放信号这样使提取信息时不产生混乱。
因此，不能使用一般的重放装置，如广泛用于重放只读光盘的所谓的紧凑盘(CD)的CD唱机。
因此，本发明的目的是提供一种新型的多层光盘，该光盘具有一个使用通用的重放装置例如CD唱机也能被重放的信息存储层，如果使用一个专用重放装置可以从其他信息存储层读取信息。
为实现上述的目的，本发明的发明者致力于长时间的研究，设计每一个信息存储层的光谱特性。因此，产生了一种新型的多层光盘，根据重放光束的波长可以检测和读取该光盘的任意信息存储层的信息并且使一个一般的重放装置能够读取该光盘的任意信息存储层提供的信号，一般的重放装置是一个广泛使用的装置。
即，根据本发明的多层光盘具有这样的结构，多个信息存储层中的一个对于波长为770nm至830nm反射因数为70％或更高些，而其他的信息存储层能使用具有与上述波长不同的波长的重放光束重放。
特别地，如图1所示，第一信息存储层2和第二信息存储层3形成在衬底1上。当衬底1的外表面照射重放光束时是在下面条件下：第一信息存储层2对于波长为770nm至830nm的重放光束的反射因数R1为70％或更高些；而第二信息存储层3对于波长为770nm至830nm的重放光束为透明的(具有光传输特性及低反射因数R2)，及对于另一波长的另一重放光束(具有第二波长的重放光束)为不透明的(具有低的光传输特性及高反射因数R2)，只有第一信息存储层2能够使用波长为770nm至830nm的重放光束读取。使用具有第二波长的重放光束，只有第二信息存储层3或者第一信息存储层2和第二信息存储层3能被读取。第一信息存储层2能否被具有第二波长的重放光束读出取决于反射因数R2和第二信息存储层3对于具有第二波长的光束的光传输特性、第一信息存储层2对于具有第二波长的光束的反射因数R1及类似条件。
根据本发明的多层光盘也可以采用上述的分层结构(其结构为信息存储层分层并形成在衬底1上)，例如，可采用一个粘接结构。如果采用粘接结构，可以使用注模来代替2P方法形成各个信息存储层的图象信号部分。这样，可以获得制造上的便利性。
当制造具有上述结构的多层光盘时，具有对于波长为770nm至830nm的反射因数为70％或更高些的信息存储层(具有反射因数R1的第一信息存储层)和使用第二波长的光束能被读取的信息存储层(具有反射因数R2的第二信息存储层)的分层顺序可以任意确定。如果第一信息存储层形成在靠近衬底处(靠近重放光束照射的部分)，第一信息存储层也需要具有光谱特性及具有一些对于第二波长的重放光束的光传输特性。如果第一信息存储层形成在第二信息存储层的后面，只需要考虑对于波长770nm至830nm的反射因数。因此，可以使用具有高反射因数的金属薄膜，如AL(铝)薄膜。
因为第一信息存储层是一个与紧凑盘兼容的信息存储层，第一信息存储层最好形成在与重放光束照射的表面相距1.2mm的部分以获取光学兼容性。因此，例如当各个信息存储层形成例如在衬底1上时，每一个信息存储层的厚度最好为大约1.2mm。
另一方面，第二信息存储层必须具有如上所述的光谱特性。因此，例如可以使用一个介质多层薄膜或一个由半导体激光材料组成的在700nm处具有一个带隙的薄膜。作为一个例子半导体激光材料可以为AlXGa(1-X)As，GaAs(1-X)PX和ZnXCd(1-X)Se。
用于使上述信息存储层互相光学分离的隔离层形成在各个信息存储层之间。隔离层最好由具有光传输特性的材料组成。为了可靠地完成上述光学分离，膈离层的厚度最好为30mm或更厚些。
为读取记录在多层光盘上的信息信号，使用波长为780nm的重放光束作为第一重放光束和使用具有另一波长的重放光束作为第二重放光束。只要其波长与第一重放光束的波长不同，那么可以任意确定第二重放光束的波长。为获取上述的选择性，波长最好互相相差到一定程度。如果为获取实际使用的便利，最好采用波长为635±20nm的重放光束。在使用第二重放光束不但从第一信息存储层而且从第二信息存储层读取信息信号的情况中，信息存储层的焦点位置必须互不相同才能从各个信息存储层中读取信息信号。
根据本发明由多个信息存储层组成的多层光盘具有这样的结构，信息存储层的其中之一对于波长为第一波长的770nm至830nm的重放光束的反射因数为70％或更高些。
因此，上述的信息存储层具有与所谓的紧凑盘(用于计算机的音乐紧凑盘和ROM盘，即CD-ROM)兼容的兼容性。记录在上述信息存储层的信息信号通过重放装置，如CD唱机也可以被重放。
另一方面，与第一波长的重放光束不同的第二波长的重放光束能够重放仅记录在第二信息存储层的信息信号或第一信息存储层和第二信息存储层的两个中的信息信号。
即，根据本发明，通过改变重放光束的波长能选择第一信息存储层和第二信息存储层的信息这样信息以大容量来存储。
图1是根据本发明的一个多层光盘的基本结构示意图；
图2是根据本发明的多层光盘的结构的实施例的必要部分的截面示意图；
图3是表示图2所示的多层光盘的反射因数的光谱特性的图；
图4是表示具有排成三层结构的第二信息存储层的多层光盘的反射因数的光谱特性的图；
图5是表示具有由半导体涂层材料形成的第二信息存储层的多层光盘的反射因数的光谱特性的图；
图6是其结构包括两个互相粘接的衬底的多层光盘的实施例的必要部分的截面示意图；
图7是其结构包括两个互相粘接的衬底的多层光盘的另一实施例的必要部分的截面示意图；
图8是具有靠近衬底的并由三层结构薄膜组成的第一信息存储的多层光盘的必要部分的截面示意图；
图9是表示图7中的多层光盘的反射因数的光谱特性的图；和
图10是表示具有两个均为Si(硅)薄膜的信息存储层的多层光盘的反射因数的光谱特性的图。
参考附图将详细描述本发明的优选实施例。
如图2所示，根据该实施例的多层光盘具有这样的结构，即第二信息存储层13，隔离层14和第一信息存储层12以这样的顺序形成在衬底11上。
衬底11可以由例如聚碳酸酯或玻璃组成。如果衬底11由聚碳酸酯组成，在形成仅用作重放信息的凸起和凹痕构型如记录凹痕的情况下可以采用所谓的2P方法。在该实施例中，聚碳酸酯衬底的厚度为1.2mm并采用注模制成。
第二信息存储层13形成在衬底11的凸起和凹痕构型上，来反射入射到衬底11的一部分光束并允许一部分光束由此发射。这样，第二信息存储层13在凸起和凹痕构型仅用于重放的情况下作为用于读出信息的反射薄膜。
隔离层14用来光学分离第二信息存储层13和第一信息存储层12。因此，膈离层14必须具有一定厚度。特别是，隔离层14的厚度最好为30mm或更厚些。如果隔离层太薄，不能互相充分隔离第一信息存储层12反射的光和第二信息存储层13反射的光，因此，不易进行准确地检测。如果膈离层太厚，产生球面象差和类似缺陷。厚度必须被适当地确定以避免上述问题。
经隔离层14形成在第二信息存储层13上的第一信息存储层12由具有高反射因数的材料构成。第一信息存储层12对于波长为770nm至830nm的反射因数为70％或更高些。
为制造上述的多层光盘，首先制备衬底11，衬底11具有对应于从第二信息存储层13读取的信息信号形成的凸起和凹痕构型，如凹痕。衬底11可以由玻璃或者塑料如聚碳酸脂塑料组成。在使用玻璃衬底的情况下，采用所谓的2P(光聚合)方法或类似方法使照相排版树脂密封在玻璃衬底和盘模之间，然后来自玻璃衬底外侧一位置的光束照射照相排版树脂来形成凸起和凹痕构型。在塑料衬底的情况下，也可以采用2P方法形成凸起和凹痕构型。然而，通常用使用模型的注模方法形成凸起和凹痕构型。
位于衬底11上的第二信息存储层13由真空蒸发的方法或喷镀的方法形成。
接着，隔离层14形成在第二信息存储层13上。因为膈离层14必须具有一定厚度如30μm的厚度或更厚些，隔离14通过旋涂方法采用紫外线固化树脂或类似材料形成。隔离层14通过使每层厚度为10μm的多次分层处理可以成为分层形状。膈离层14可以通过粘接透明片来形成。
隔离层14也必须具有对应于记录在第一信息存储层12上的信息信号而形成的凹痕或类似标记。上述的凹痕可以通过2P方法形成类似于上述的凸起和凹痕构型。
在隔离层14形成之后，第一信息存储层12形成在膈离层14上。然后，如果有必要，由紫外线固化树脂或类似材料形成保护薄膜15。
在该实施例中，衬底11上的第二信息存储层13为由Si3N4/SiO2/Si4N4/SiO2/Si3N4层组成的五层结构薄膜形式。五层的厚度分别为64nm/90nm/64nm/90nm/64nm。
Si3N4的折射系数n为2.0，消光系数K为0，而SiO2的折射系数n为1.5，消光系数K为0。由此可得，使用具有类似光学特性的材料可以获得类似的特性。
第一信息存储层12是厚度为100nm的Al薄膜。
在这种结构的多层光盘中，第二信息存储器13(五层结构薄膜)的反射因数R2具有图3所示的光谱特性，该反射因数R2对于波长635nm为34％；而对于波长为780nm的光束的反射因数R2几乎为零。即，第二信息存储层13对于波长为635nm的光束有一些折射性并允许波长为780nm的光束几乎全部通过。
另一方面，第一信息存储层12(Al薄膜)对于透射到第二信息存储层13的两束光的反射因数为80％或更高些。因此，第一信息存储层12关于重放光束的反射因数R1对于充分透射到第二信息存储层13的波长为780nm的光束的约为84％而对于部分透射到第二信息存储层13的波长为635nm的光束的约为38％。
对于具有上述结构的多层光盘，使用波长为780nm的重放光束能够仅从第一信息存储层12获得反射光束使记录在第一信息存储层12上的信息信号被读取。因为在CD唱机和类似装置中使用波长为780nm的重放光束，记录在第一信息存储层12的信息信号也可以通过上述的通用重放装置重放。
因为第一信息存储层12和第二信息存储层13对于波长为635nm的重放光束的反射因数约为30％，所以从两个层12和13可以获取信息信号。这样，使重放光束的焦点位置为互不相同，这样不但可以从第一信息存储层12而且可以从第二信息存储层13读取信息。第二实施例
制造一多层光盘，包括一个具有三层结构薄膜的第二信息存储层13，而其他层分别具有与第一实施例类似的结构。注意第二信息存储层13为三层结构薄膜形式，三层分别由SiXN(1-X)(n＝2.8和k＝0)/Si3N4(n＝2和k＝0)/SiXN(1-X)(n＝2.8和k＝0)组成。各层厚度为40nm/73nm/40nm。
仅在该实施例中，第一信息存储层12的反射因数R1和第二信息存储层13的反射因数R2具有如图4所示的光谱特性。使用波长为780nm的重放光束，只有记录在第一信息存储层12的信息信号能被读取。使用波长为635nm的重放光束，不但能从第一信息存储层12而且可以从第二信息存储层13读取信息。第三实施例
在该实施例，第二信息存储层13由半导体激光材料AlxGa(1-X)As组成其厚度为120nm。
第一信息存储层12是厚度为100nm的Al薄膜。其他结构与根据第一实施例的结构相同。
在如上所述的多层光盘中，第二信息存储层13的反射因数R2具有如图5所示的光谱特性，即对于波长为635nm的光束的反射因数约为32％，而对于波长为780nm的光束的接近为零。也就是，第二信息存储层13对于波长为635nm的光束具有一些折射性而允许波长为780nm的光束充分通过。
另一方面，第一信息存储层12(Al薄膜)对于透射到第二信息存储层13的两束光的反射因数为80％或更高些。因此，第一信息存储层12对于基本透射到第二信息存储层13的波长为780nm的光束的反射因数R1约为84％，而对于基本透射到第二信息存储层13的波长为635nm的光束的反射因数约为36％。
对于上述结构的多层光盘，使用波长为780nm的重放光束仅从第一信息存储层12获得反射光，这样仅从第一信息存储层12读取信息信号。另一方面，因为第一信息存储层12和第二信息存储层13对于波长为635nm的重放光束的反射因数均为30％或更高些，从两个层12和13能够获得信息信号。通过使重放光束的焦点位置互不相同，可以从两个层12和13读取信息。第四实施例
如图6所示，该实施例具有这样的结构，第二信息存储层23形成在厚度为0.6mm的衬底21上，第一信息存储层22形成在厚度为0.6mm的第二衬底31上，两个衬底21和31通过具有光传输特性的粘接层24互相粘接。这样，构成根据该实施例的多层光盘。
衬底21和31中的每一个均为通过注模获得的聚碳酸酯衬底或2P方法制造的玻璃衬底。信息存储层22和23的结构与根据第一实施例的结构类似。保护薄膜25形成在第一信息存储层22上。
仍对于具有上述结构的多层光盘，与第一实施例类似，对于波长为780nm的重放光束仅从第一信息存储层22获得反射光。对于波长为635nm的重放光束，从第一信息存储层22和第二信息存储层23获得反射光。
该实施例可以具有形成为这样的另一结构，第一衬底和第二衬底通过粘接层24以第一信息存储层22和第二信息存储层23相对的方式互相粘接。第五实施例
如图7所示，该实施例具有排列成这样的结构，第二信息存储层43形成在厚度为1.2mm的第一衬底41上，第一信息存储层42形成在厚度为0.6mm的第二衬底51上，并且第一和第二衬底41和51通过粘接层44以信息存储层42和43相对的方式互相接合。
衬底41和51均为通过注模形成的聚碳酸酯。信息存储层42和43每层的结构与第一实施例的结构类似。
与第一实施例类似，具有上述结构的多层光盘对于波长为780nm的重放光束仅从第一信息存储层42获得反射光束。对于波长为635nm的重放光束从第一信息存储层42和第二信息存储层43两层获得反射光束。
因为该实施例具有这样的结构，第一信息存储层42和第二信息存储层形成在通过注模获得的为聚碳酸酯衬底的对应的衬底41和51，不需要象2P方法这样的技术。因此，根据该实施例的多层光盘能够很容易地被制造。第六实施例
如图8所示，该实施例具有排列成这样的结构，第一信息存储层62与衬底61邻接，然后第二信息存储层63通过隔离层64形成在第一信息存储层62上。
第一信息存储层62由厚度分别为45nm/195nm/45nm及分别由SiXN(1-X)(n＝3.5和k＝0)/SiO2(n＝1.5和k＝0)/SiXN(1-X)(n＝3.5和k＝0)组成的三层结构构成。
第二信息存储层为Al薄膜。
具有上述结构的多层光盘也可以获得如图9所示的反射因数的光谱特性。对于波长为780nm的重放光束，仅从图9中的标记为符号R1的第一信息存储层62获得反射光束。对于波长为635nm的重放光束，第一信息存储层具有光传输特性使从图9中的标记为符号R2的第二信息存储层63获得反射光束。比较的实施例
制造一种由形成第一和第二信息存储层的厚度为14nm的Si薄膜组成的多层光盘。然后，测量每层Si薄膜的反射因数的光谱特性。
因此，每一个Si层的反射因数不依赖于图10所示的波长。因为反射因数对于波长为780nm的光束特别低，所以不能获得与紧凑盘和类似盘的兼容性。
注意本发明具有这样的结构，对应于波长为780nm的光束的信息存储层以可由CD唱机重放的CD格式形成。另一方面，仅对应于波长为635nm的光束的信息存储层以较例如CD格式高的密度记录。
虽然在优选实施例中详细描述了本发明，在不离开本发明后附的权利要求的精神和范围情况下显然可以对本发明公开的优选实施例在结构细节和部件的组合和安排上作一些改动。

Claims (14)

1.一种多层光盘，包括：
多个信息存储层，其中所述的每一个多个信息存储层对于作为重放光束的第一波长的波长770nm于830nm的反射因数为70％或更高，及
其他的信息存储层利用具有与所述的重放光束的第一波长不同的第二波长的重放光束重放。
2.根据权利要求1所述的多层光盘，其中每一个所述的其他信息存储层对于所述的重放光束的第二波长的反射因数为20％或更高。
3.根据权利要求2所述的多层光盘，其中所述的重放光束的第二波长为615nm至655nm。
4.根据权利要求1所述的多层光盘，其中利用具有所述的第一波长的重放光束重放的第一信息存储层和利用具有所述的第二波长的重放光束重放的第二信息存储层形成在衬底上。
5.根据权利要求1所述的多层光盘，其中由具有所述的第一波长的重放光束重放的第一信息存储层形成在其上的第一衬底和由具有所述的第二波长的重放光束重放的第二信息存储层形成在其上的第二衬底互相结合。
6.根据权利要求4或5所述的多层光盘，其中记录在所述的第一信息存储层和记录在所述的第二信息存储层的两层信息信号由具有所述的第二波长的重放光束重放。
7.根据权利要求4或5所述的多层光盘，其中只有记录在所述第二信息存储层的信息信号由具有所述的第二波长的重放光束重放。
8.根据权利要求4或5所述的多层光盘，其中所述的第二信息存储层由一个介质多层薄膜形成。
9.根据权利要求4或5所述的多层光盘，其中所述的第二信息存储层由一个在接近波长700nm时具有带隙的半导体材料构成。
10.根据权利要求4所述的多层光盘，其中所述的第一信息存储层和所述的第二信息存储层通过一个具有光传输特性的膈离层分层。
11.根据权利要求4所述的多层光盘，其中所述的第一信息存储层和所述的第二信息存储层以这样的顺序次序在所述的衬底上分层。
12.根据权利要求4所述的多层光盘，其中所述的第二信息存储层和所述的第一信息存储层以这样的顺序次序在所述的衬底上分层。
13.一种多层光盘，包括：在一个衬底上的多个信息存储层，
所述的多个信息存储层包括：
能够发射具有波长615至655nm的第一光束的一部分并反射所述第一光束的另一部分的第一信息存储层；
形成在所述的第一信息存储层的光发射层；和
形成在所述光发射层并对于波长为770nm至830nm的第二光束的反射因数为70％或更高的第二信息存储层。
14.根据权利要求13所述的多层光盘，其中所述的第一信息存储层包含SiN。
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