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公开(公告)号：US20070048489A1
公开(公告)日：2007-03-01
申请号：US11512507
申请日：2006-08-30
CPC分类号： G11B7/24038 , G11B7/1275 , G11B7/258 , G11B2007/0006
摘要： An optical disc includes a first substrate having a first surface having a first recording layer formed thereon, a first reflective film formed on the first recording layer, a second substrate having a second surface and a third surface on both sides with a second recording layer and a third recording layer formed thereon, respectively, a second semi-transparent reflective film formed on the second recording layer, a third semi-transparent reflective film formed on the third recording layer, an adhesive layer provided between the first and second reflective films, and a transparent cover layer having a fourth surface and a fifth surface on both sides, formed on the third semi-transparent reflective film at the fourth surface. The first recording layer is capable of storing first data in compliance with first specifications. The second recording layer is capable of storing second data in compliance with the first specifications. The third recording layer is capable of storing third data in compliance with second specifications different from the first specifications. The second semi-transparent reflective film has a thickness in the range from 5 nm to 15 nm. The transparent cover layer has a thickness of 100 μm±3 μm. The cover layer allows a laser beam to pass therethrough via the fifth surface in reproduction of the first, the second or the third data from the first, the second, or the third recording layer, respectively.
摘要翻译： 一种光盘包括：具有形成在其上的第一记录层的第一表面的第一基板，形成在第一记录层上的第一反射膜，具有第二表面的第二基板和具有第二记录层的两侧的第三表面， 分别在其上形成的第三记录层，形成在第二记录层上的第二半透明反射膜，形成在第三记录层上的第三半透明反射膜，设置在第一和第二反射膜之间的粘合层，以及 在第四表面上形成在第三半透明反射膜上的透明覆盖层，其具有在两侧上的第四表面和第五表面。 第一记录层能够按照第一规格存储第一数据。 第二记录层能够存储符合第一规格的第二数据。 第三记录层能够存储符合与第一规格不同的第二规格的第三数据。 第二半透明反射膜的厚度在5nm至15nm的范围内。 透明覆盖层的厚度为100μm±3μm。 分别从第一，第二或第三记录层再现第一，第二或第三数据时，覆盖层允许激光束经由第五表面通过。
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公开(公告)号：US07619962B2
公开(公告)日：2009-11-17
申请号：US11710755
申请日：2007-02-26
IPC分类号： G11B7/24
CPC分类号： G11B7/24085 , G11B7/24038 , G11B7/261
摘要： An optical disc with a first recording layer has first data pits that include 14T data pits formed thereon in compliance with DVD-ROM specifications. A first reflective film is formed on the first recording layer, whereby the first reflective film has the relationship of 2.3≦Pw/Tf≦14 between the 14T pit width and the first reflective film thickness. The disc also includes a second recording layer having a first surface and an opposed second surface, whereupon second data pits are formed on the first surface in compliance with BD-ROM specifications. A second semi-transparent reflective film is formed on the second recording layer, while a transparent layer having opposed third and fourth surfaces is formed over the second reflective film at the third surface, such that the fourth surface allows a laser beam to pass therethrough in reproduction from either the first or second data pits.
摘要翻译： 具有第一记录层的光盘具有符合DVD-ROM规范的在其上形成的14T数据坑的第一数据坑。 第一反射膜形成在第一记录层上，第一反射膜在14T凹坑宽度与第一反射膜厚度之间具有2.3 <= Pw / Tf <= 14的关系。 光盘还包括具有第一表面和相对的第二表面的第二记录层，于是依照BD-ROM规范在第一表面上形成第二数据坑。 第二半透明反射膜形成在第二记录层上，而在第三表面上在第二反射膜上形成具有相对的第三和第四表面的透明层，使得第四表面允许激光束穿过其中 从第一或第二数据坑再现。
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公开(公告)号：US07567499B2
公开(公告)日：2009-07-28
申请号：US11512507
申请日：2006-08-30
IPC分类号： G11B7/00
CPC分类号： G11B7/24038 , G11B7/1275 , G11B7/258 , G11B2007/0006
摘要： An optical disc includes a first substrate having a first surface having a first recording layer formed thereon, a first reflective film formed on the first recording layer, a second substrate having a second surface and a third surface on both sides with a second recording layer and a third recording layer formed thereon, respectively, a second semi-transparent reflective film formed on the second recording layer, a third semi-transparent reflective film formed on the third recording layer, an adhesive layer provided between the first and second reflective films, and a transparent cover layer having a fourth surface and a fifth surface on both sides, formed on the third semi-transparent reflective film at the fourth surface. The first recording layer is capable of storing first data in compliance with first specifications. The second recording layer is capable of storing second data in compliance with the first specifications. The third recording layer is capable of storing third data in compliance with second specifications different from the first specifications. The second semi-transparent reflective film has a thickness in the range from 5 nm to 15 nm. The transparent cover layer has a thickness of 100 μm±3 μm. The cover layer allows a laser beam to pass therethrough via the fifth surface in reproduction of the first, the second or the third data from the first, the second, or the third recording layer, respectively.
摘要翻译： 一种光盘包括：具有形成在其上的第一记录层的第一表面的第一基板，形成在第一记录层上的第一反射膜，具有第二表面的第二基板和具有第二记录层的两侧的第三表面， 分别在其上形成的第三记录层，形成在第二记录层上的第二半透明反射膜，形成在第三记录层上的第三半透明反射膜，设置在第一和第二反射膜之间的粘合层，以及 在第四表面上形成在第三半透明反射膜上的透明覆盖层，其具有在两侧上的第四表面和第五表面。 第一记录层能够按照第一规格存储第一数据。 第二记录层能够存储符合第一规格的第二数据。 第三记录层能够存储符合与第一规格不同的第二规格的第三数据。 第二半透明反射膜的厚度在5nm至15nm的范围内。 透明覆盖层的厚度为100μm±3μm。 分别从第一，第二或第三记录层再现第一，第二或第三数据时，覆盖层允许激光束经由第五表面通过。
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公开(公告)号：US20070147223A1
公开(公告)日：2007-06-28
申请号：US11710755
申请日：2007-02-26
IPC分类号： G11B7/24
CPC分类号： G11B7/24085 , G11B7/24038 , G11B7/261
摘要： An optical disc is produced. A first recording layer is formed on a first substrate having a thickness of 0.6 mm±30 μm, so that the first recording layer has first data pits formed concentrically or spirally in compliance with the DVD-ROM specifications, the first data pits including 14T pits, T being a reference clock cycle. A first reflective film is formed on the first recording layer, so that the first reflective film has a thickness in the range from 30 nm to 140 nm and has a relationship of 2.3≦Pw /Tf≦14 with the first reflective film, wherein Pw is a pit width of each 14T pit at a middle section of the first substrate and Tf is a thickness of the first reflective film, the middle section being located between a top section and a bottom section of the first substrate in a thickness direction thereof, a distance from the top section to the middle section and another distance from the middle section to the bottom section being equal to each other. A second recording layer is formed on a second substrate having a thickness of 0.5 mm±30 μm and having a first surface and an opposing second surface, so that the second recording layer has second data pits formed on the first surface concentrically or spirally in compliance with the BD-ROM specifications. A second semi-transparent reflective film is formed on the second recording layer. A transparent layer having a third and an opposing fourth surface is formed over the second reflective film at the third surface, the fourth surface allowing a laser beam to pass therethrough in reproduction from at least either the first or the second data pits. The first and second substrates are bonded to each other so that the first reflective film and the second surface of the second substrate face each other.
摘要翻译： 制造光盘。 第一记录层形成在厚度为0.6mm±30μm的第一基板上，使得第一记录层具有符合DVD-ROM规范的同心或螺旋形状的第一数据凹坑，第一数据凹坑包括14T凹坑 ，T为参考时钟周期。 第一反射膜形成在第一记录层上，使得第一反射膜的厚度在30nm至140nm的范围内，并且与第一反射膜的关系为2.3 <= Pw / Tf <= 14， 其中Pw是第一基板的中间部分处的每个14T凹坑的凹坑宽度，Tf是第一反射膜的厚度，中间部分位于第一基板的顶部与底部之间的厚度方向 从顶部到中间部分的距离以及从中间部分到底部部分的距离彼此相等。 第二记录层形成在厚度为0.5mm±30μm的第二基板上，具有第一表面和相对的第二表面，使得第二记录层具有在第一表面上形成的第二数据凹坑，该第二数据凹坑在第一表面上以一致的方式或螺旋地形成 具有BD-ROM规格。 第二半透明反射膜形成在第二记录层上。 在第三表面上在第二反射膜上形成具有第三和相对的第四表面的透明层，第四表面允许激光束从第一或第二数据坑中的至少一个再现中通过。 第一和第二基板彼此接合，使得第一反射膜和第二基板的第二表面彼此面对。
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公开(公告)号：US4863795A
公开(公告)日：1989-09-05
申请号：US99067
申请日：1987-09-21
申请人： Itsuro Nakamura , Yoshiaki Sato , Junichi Ito
发明人： Itsuro Nakamura , Yoshiaki Sato , Junichi Ito
CPC分类号： G11B5/70673 , G11B5/714 , Y10S428/90 , Y10T428/257
摘要： A magnetic recording medium comprises a base film and a magnetic film having magnetic particles, formed on the base film. The magnetic film has a coercive force ranging from 750 Oe to 980 Oe and a residual magnetic flux density of 1,250 Gauss or over. In addition, the magnetic particles have a length of 0.2 .mu.m or below.
摘要翻译： 磁记录介质包括基膜和形成在基膜上的具有磁性颗粒的磁膜。 该磁性膜的矫顽力为750Oe至980Oe，剩余磁通密度为1250高斯或以上。 此外，磁性粒子的长度为0.2μm以下。
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