CN1086243C - 高密度光盘 - Google Patents

高密度光盘 Download PDF

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CN1086243C
CN1086243C CN97122648A CN97122648A CN1086243C CN 1086243 C CN1086243 C CN 1086243C CN 97122648 A CN97122648 A CN 97122648A CN 97122648 A CN97122648 A CN 97122648A CN 1086243 C CN1086243 C CN 1086243C
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substrate
information
high density
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CN1197270A (zh
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卢明道
吉炳龙
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Samsung Electronics Co Ltd
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    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
    • G11B7/2585—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers based on aluminium
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
    • G11B7/2595—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers based on gold
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • G11B7/263—Preparing and using a stamper, e.g. pressing or injection molding substrates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/913—Material designed to be responsive to temperature, light, moisture
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/146—Laser beam
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/21—Circular sheet or circular blank
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal

Abstract

一种高密度光盘，包括在第一个基片的两个信息记录面上分别形成的反射层，以及在第二个和第三个基片中的每个基片的一个信息记录面上分别形成的半透明层。第二个和第三个基片分别粘接到第一个基片的两侧。

Description

高密度光盘
本发明涉及用来利用激光重放记录的信息的光记录介质，更详细地说，涉及能密集地记录和重放信息的一种高密度记录介质。
近来，主要作为声频和视频记录介质的高密度光盘的研究工作一直在积极进行。作为高图像质量和高声音质量的信息传输介质的代表性的例子的数字视盘(DVD)系统，带来了把数字视频信息和声频信息结合起来的多媒体时代的概念。DVD系统的诞生除了是视频和声频信息数字化的技术革新之外，作为取代那些模拟视频系统的盒式磁带录像机和激光盘的需求，它有着巨大的商业市场前景。因此，需要有一种能增加记录容量的高密度基片的制作方法，以适应下一代多媒体市场。
转让给与本发明一样的受转让人的韩国专利申请第95-1802号中公开了一种制作高密度基片的技术。在上述专利申请第95-1802号中，在基片1的下部相继形成半透明层2和保护层4B，基片1在其两面形成有凹槽和凹坑。在基片1的上部相继形成反射层3和保护层4A。但是，如果在光束的入射方向有尘埃或污物，上述光盘基片在重放过程中可能产生错误，这是因为一个光点被散射了。此外，由于信息面暴露在外部，使用光盘时可能损坏信息面，必然会影响耐用性。
本发明的一个目的是提供一种能增加记录容量并确保耐用性的高密度光盘。
本发明的另一个目的是提供一种能简化作业并提高产量的高密度光盘。
体现本发明的高密度光盘包括：在第一个基片的两个信息记录面上分别形成的反射层；在第二个和第三个基片中的每个基片的一个信息记录面上分别形成的半透明层；其中所述第二个和第三个基片分别粘接到所述第一个基片的两面，第二个和第三个基片的信息面朝向第一基片粘接。
下面将参照附图更具体地说明本发明，其中：
图1是传统光盘的截面图；以及
图2是根据本发明的光盘的截面图。
在下面的说明中，不再详细描述众所周知的功能和结构，它们可能以不必要的细节使本发明模糊不清。
为了制作一片典型的光盘，需要一系列工艺过程，即母盘制作过程，压模制作过程，盘片成型过程，反射层和保护层的形成过程，后处理过程，等等。母盘制作过程就是通过用光刻法在覆盖在玻璃母板上的光刻胶上面形成微小的凹坑来制作玻璃母盘。压模制作过程就是用镀金法把在玻璃母盘上形成的微小凹坑转移到压模上。盘片成型过程就是利用压模大量地复制光盘基片。作为盘片成型过程，有压塑法，注模法，光聚法(2P)等等。反射层和保护层形成过程就是形成反射层和保护层。反射层一般通过真空沉积或阴极溅镀等等形成。保护层通常用旋转法形成。
在本发明的一个最佳实施方案中，与一般的盘片成型过程(例如，注模法)不同，盘片是通过将两个记录有信息的压模固定到制模机的两个表面上制成的。之后，就在一个基片的两面产生记录信息的凹坑。在形成反射层和保护层时，把一个靶放在溅镀设备的工作室的两个面上，以便在一个基片的两个面上同时形成反射层。
在压模制作过程中，例如，把道间距设置在0.6微米。此外，图1所示的基片结构得到改进。也就是说，如图2所示，用紫外线粘接法(UV bonding)把每个厚度为0.6毫米的基片分别粘到具有两个信息记录面的0.6毫米或1.2毫米的基片上部和下部。所以有四个信息面。
图2是根据本发明的光盘的截面图。参看图2，在已经形成凹坑的基片10的两个表面上，相继形成铝反射层12A和12B，紫外线粘接层14A和14B，半透明层16A和16B，以及仅仅在其一面形成凹坑的基片18A和18B。与一般的模压法不同，具有在其两面形成的记录信息的凹坑的基片10是通过把两个压模固定到金属模的两面并压制压模来制作的。具有仅仅在其一面形成的记录信息的凹坑的基片18A和18B是通过把压模固定到金属模的一面并压制压模来制作的。在基片10的两面分别形成铝或铝-钛反射层12A和12B。在用一般模压方法制作的基片18A和18B的每一个基片的形成凹坑的面上分别产生SiN、SiC或Au半透明层16A和16B。在制作好基片10以及基片18A和18B之后，用紫外线粘接法把两个基片18A和18B粘接到基片10的两个表面上。用紫外线粘接法形成的紫外线粘接层14A和14B的每一个的厚度最好是30-40微米。
为了从图2的光盘上重放信息，635纳米的红色激光束透过基片18A照射，从而读出上面基片18A的信息。利用穿过半透明层16A和紫外线粘接层14A的红色激光束重放光盘上层的信息。光盘上层的信息是靠反射率的不同而读出的。SiN半透明层16A的反射率是30％，而铝反射层12A的反射率是90％。在半透明层16A的信息层的情况下由光盘上层的光学头所检测到的反射率是30％，在反射层12A的信息层的情况下是44％。
光盘下层的信息由安装在那里的另外的光学头重放。
下面的表1表示与图1的传统光盘相比图2中本发明的光盘的容量。
                         表1
  最小的凹坑长度    道间距   信道位长度    分辨率     记录容量
传统光盘 0.4(微米) 0.74(微米) 0.1333(微米) 0.01(微米) 9.4(GB/盘片)
本发明的光盘 0.36(微米) 0.60(微米) 0.1197(微米) 0.01(微米) 30(GB/盘片)
如上面的表1所示，传统光盘在道间距为0.74微米的情况下，每个盘片的记录容量为9.4千兆字节(GB)，而本发明的光盘在道间距为0.6微米的情况下，具有每个盘片30GB的记录容量。
如前面所述，由于有四个信息层，可得到一般DVD两倍的记录容量。DVD系统有复杂的工艺制作过程，因为需要通过光聚作用制作双层。但是，本发明的光盘没有光聚作用，简化了作业并能提高产量。此外，通过把0.6毫米的基片粘结到具有两个信息记录面的基片的上下部分，能提高耐用性。
应该理解，本发明并不局限于在此公开的特定的实施例，作为试图实现本发明的最佳方式，本发明不限于在这个详细说明中所描述的具体实施例，而只限于所附加的权利要求书中所确定的内容。

Claims (6)

1.一种高密度光盘，包括：
在第一个基片(10)的两个信息记录面上分别形成的反射层(12A，12B)；以及
在第二个和第三个基片(18A，18B)中的每个基片的一个信息记录面上分别形成的半透明层(16A，16B)；
其中所述第二个和第三个基片(18A，18B)分别粘接到所述第一个基片(10)的两面，第二个和第三个基片(18A，18B)的信息面朝向第一基片(10)粘接。
2.如权利要求1中所述的一种高密度光盘，其特征在于，在第一和第二基片以及第一和第三基片之间有用于使得所述的基片用紫外线粘接方法粘接的紫外线粘接层(14A，14B)。
3.如权利要求1或2中所述的一种高密度光盘，其特征在于，一个粘接层的厚度为30-40微米。
4.如权利要求3中所述的一种高密度光盘，其特征在于，所述半透明层(16A，16B)的每一层的材料是碳化硅(SiC)或氮化硅(SiN)。
5.如权利要求3中所述的一种高密度光盘，其特征在于，所述的每一个反射层(12A，12B)的材料是铝。
6.如权利要求3中所述的一种高密度光盘，其特征在于，所述的每一个反射层(12A，12B)的材料是铝-钛。
CN97122648A 1997-04-18 1997-11-26 高密度光盘 Expired - Fee Related CN1086243C (zh)

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US6177168B1 (en) * 1999-03-26 2001-01-23 Warner Music Group, Inc. DVD disc with four information layers, and method for making same
US6775839B1 (en) 2002-03-15 2004-08-10 O'brien Patrick J. Optical storage device with print layer surface feature
EP1579437A1 (en) * 2002-12-19 2005-09-28 Koninklijke Philips Electronics N.V. Dual stack optical data storage medium and use of such medium
WO2006116885A1 (en) * 2005-05-02 2006-11-09 Unaxis Balzers Ag Reusable stamper for optical disk
JP2007133970A (ja) * 2005-11-10 2007-05-31 Canon Inc 光記録媒体およびその製造方法
JP2007287194A (ja) * 2006-04-12 2007-11-01 Toshiba Corp 光ディスク及び光ディスク装置
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KR100402169B1 (ko) * 1995-04-27 2004-03-10 닛폰콜롬비아 가부시키가이샤 다층구조광정보매체
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USRE37742E1 (en) 2002-06-11
JP2868497B2 (ja) 1999-03-10
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