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1. 发明授权

US07241471B2 Magnetic recording medium and method of fabricating the same 失效
公开(公告)号：US07241471B2
公开(公告)日：2007-07-10
申请号：US10885340
申请日：2004-07-06
申请人： Yasumi Sato , Jota Ito
发明人： Yasumi Sato , Jota Ito
IPC分类号： B05D5/12
CPC分类号： G11B5/64 , G11B5/85
摘要： A method of fabricating a low-noise, high-output and large-capacity magnetic recording medium compatible with the AIT3 format in which a metal magnetic film is formed by the vacuum evaporation process under supply of oxygen is disclosed. In the vacuum evaporation process, the running speed of a non-magnetic support is controlled within a range from 150 to 200 m/min, and on thus continuously fast-running, non-magnetic support, a Co magnetic thin film is formed under supply of oxygen so as to achieve a coercive force Hc of the Co magnetic thin film of 100 to 115 kA/m, and a squareness ratio of 0.79 or larger.

2. 发明授权

US5914180A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5914180A
公开(公告)日：1999-06-22
申请号：US531703
申请日：1995-09-21
申请人： Jota Ito , Takashi Chiba , Kenichi Sato , Hidetoshi Honda , Toshiharu Uchimi , Taketoshi Sato , Yukihiro Koshika , Yasumi Sato
发明人： Jota Ito , Takashi Chiba , Kenichi Sato , Hidetoshi Honda , Toshiharu Uchimi , Taketoshi Sato , Yukihiro Koshika , Yasumi Sato
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/72 , G11B5/85
CPC分类号： G11B5/656 , G11B5/64 , G11B5/72 , G11B5/85 , Y10S438/90
摘要： A magnetic recording medium having a thin magnetic metal film formed by vapor deposition under an atmosphere of an introduced oxygen gas. The thickness of the surface oxide film having the degree of oxidation of 50% or higher is maintained so as to be not higher than 5% of the total film thickness of the thin magnetic metal film. The magnetic recording medium is affected to a lesser extent by the surface oxide layer such that it is superior in magnetic properties, such as coercivity, and in electromagnetic properties.
摘要翻译：一种磁记录介质，其具有在引入的氧气气氛下通过气相沉积形成的薄磁性金属膜。氧化度为50％以上的表面氧化膜的厚度保持不低于薄磁性金属膜的总膜厚的5％。磁记录介质在较小程度上受到表面氧化物层的影响，使得磁性能如矫顽力和电磁特性都优异。

3. 发明授权

US07217468B2 Magnetic recording medium and method of fabricating the same 失效
标题翻译：磁记录介质及其制造方法
公开(公告)号：US07217468B2
公开(公告)日：2007-05-15
申请号：US10412946
申请日：2003-04-14
申请人： Yasumi Sato , Jota Ito
发明人： Yasumi Sato , Jota Ito
IPC分类号： G11B5/66 , G11B5/70
CPC分类号： G11B5/64 , G11B5/85
摘要： A method of fabricating a low-noise, high-output and large-capacity magnetic recording medium compatible with the AIT3 format in which a metal magnetic film is formed by the vacuum evaporation process under supply of oxygen is disclosed. In the vacuum evaporation process, the running speed of a non-magnetic support is controlled within a range from 150 to 200 m/min, and on thus continuously fast-running, non-magnetic support, a Co magnetic thin film is formed under supply of oxygen so as to achieve a coercive force Hc of the Co magnetic thin film of 100 to 115 kA/m, and a squareness ratio of 0.79 or larger.
摘要翻译：公开了一种制造与AIT3格式兼容的低噪声，高输出和大容量磁记录介质的方法，其中在供氧下通过真空蒸镀工艺形成金属磁膜。在真空蒸镀工序中，将非磁性载体的运行速度控制在150〜200m / min的范围内，在这种连续快速运转的非磁性支持下，在供给下形成Co磁性薄膜的氧，以使Co磁性薄膜的矫顽力Hc为100〜115kA / m，矩形比为0.79以上。

4. 发明授权

US5976668A Base film for magnetic recording medium and magnetic recording medium using same 失效
标题翻译：用于磁记录介质的基膜和使用其的磁记录介质
公开(公告)号：US5976668A
公开(公告)日：1999-11-02
申请号：US920568
申请日：1997-08-29
申请人： Kazunobu Chiba , Jota Ito , Tsutomu Takeda , Shinichi Matsumura
发明人： Kazunobu Chiba , Jota Ito , Tsutomu Takeda , Shinichi Matsumura
IPC分类号： G11B5/73 , G11B5/738 , G11B5/704
CPC分类号： G11B5/7325 , G11B5/73 , G11B5/738 , Y10S428/90 , Y10T428/24355 , Y10T428/24942 , Y10T428/31678
摘要： A base film for a magnetic recording medium including one surface, on which a magnetic layer can be formed, having a surface roughness of center line average roughness Ra of 10 nm or less, a ten-point average roughness Rz of 80 nm or less and a maximum height Rmax of 150 nm or less. The base film includes the other surface having a surface roughness of center line average roughness Ra of 4.5 to 20 nm, a ten-point average roughness Rz of 35 to 350 nm and a maximum height Rmax of 40 to 400 nm.
摘要翻译：一种用于磁记录介质的基膜，包括其中可以形成磁性层的一个表面，其中心线平均粗糙度Ra的表面粗糙度为10nm以下，十点平均粗糙度Rz为80nm以下，最大高度Rmax为150nm以下。基膜包括中心线平均粗糙度Ra的表面粗糙度为4.5〜20nm，十点平均粗糙度Rz为35〜350nm，最大高度Rmax为40〜400nm的另一面。

5. 发明授权

US5662984A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5662984A
公开(公告)日：1997-09-02
申请号：US250432
申请日：1994-05-27
申请人： Hidetoshi Honda , Yasumi Sato , Taketoshi Sato , Jota Ito , Yoshihito Ebine , Toshikazu Sasaki
发明人： Hidetoshi Honda , Yasumi Sato , Taketoshi Sato , Jota Ito , Yoshihito Ebine , Toshikazu Sasaki
IPC分类号： G11B5/72 , G11B5/73 , G11B5/733 , G11B5/84 , G11B5/66 , B32B3/10 , B32B5/16 , B32B9/00
CPC分类号： G11B5/8408 , G11B5/72 , Y10S428/90 , Y10T428/24355 , Y10T428/265 , Y10T428/30
摘要： A magnetic recording medium has a magnetic layer formed by a thin magnetic metal layer and a carbon protective layer on a non-magnetic substrate; the surface of the carbon protective layer has first protrusions formed by first particles and second protrusions formed by second particles; the carbon protective film has a thickness in the range of 3 nm to 30 nm, while the first protrusions have the heights of 65 nm.+-.15 nm to 95 nm.+-.15 nm and the second protrusions have the heights of 18 nm.+-.5 nm to 28 nm.+-.5 nm; since the surface properties of the carbon protective film are controlled, the electro-magnetic conversion characteristics may be prevented from being lowered due to the spacing losses for improving the running durability of the recording medium.
摘要翻译：磁记录介质具有由非磁性基板上的薄磁性金属层和碳保护层形成的磁性层; 碳保护层的表面具有由第一颗粒形成的第一突起和由第二颗粒形成的第二突起; 碳保护膜的厚度在3nm至30nm的范围内，而第一突起的高度为65nm +/- 15nm至95nm +/- 15nm，第二突起的高度为18nm +/- 5nm至28nm +/- 5nm; 由于控制了碳保护膜的表面特性，因此为了提高记录介质的行驶耐久性而能够防止因间隔损失而降低电磁转换特性。

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