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公开(公告)号：US07903374B2
公开(公告)日：2011-03-08
申请号：US12816093
申请日：2010-06-15
Applicant: Yoshihiro Shiroishi
Inventor： Yoshihiro Shiroishi
IPC: G11B5/147
CPC classification number: B82Y25/00 , B82Y10/00 , G11B5/00 , G11B5/09 , G11B5/313 , G11B5/3909 , G11B5/3967 , G11B5/484 , G11B5/656 , G11B5/66 , G11B5/7325 , G11B2005/0002 , G11B2005/0005 , G11B2005/3996
Abstract: A magnetic recording and reading device includes a perpendicular magnetic recording medium, a perpendicular magnetic head having a recording head width having a heat-generating portion and a reading head, a fine adjustment portion, and a R/W-IC. The perpendicular magnetic head is configured to perform magnetic recording on the recording medium while locally heating the recording medium so as to enable a change of the coercive force of the recording medium during the recording after correcting of the position of the perpendicular magnetic head by the fine adjustment portion is completed, and to perform reading of the magnetic recording information with the aid of the reading head after correcting of the position of the perpendicular magnetic head by the fine adjustment portion is completed.
Abstract translation: 磁记录和读取装置包括垂直磁记录介质，具有发热部分和读头的记录头宽度的垂直磁头，微调部分和R / W-IC。 垂直磁头被配置为在记录介质上执行磁记录，同时局部加热记录介质，以便在校正垂直磁头的位置之后能够在记录期间改变记录介质的矫顽力 调整部分完成，并且在通过微调部分校正垂直磁头的位置之后，借助于读取头来执行磁记录信息的读取。
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2.发明授权
公开(公告)号：US5815343A
公开(公告)日：1998-09-29
申请号：US967346
申请日：1997-10-27
Applicant: Akira Ishikawa , Yoshihiro Shiroishi , Yuzuru Hosoe , Yotsuo Yahisa , Tomoo Yamamoto , Masukazu Igarashi , Akira Osaki , Yoshiki Kato , Jun Fumioka
Inventor： Akira Ishikawa , Yoshihiro Shiroishi , Yuzuru Hosoe , Yotsuo Yahisa , Tomoo Yamamoto , Masukazu Igarashi , Akira Osaki , Yoshiki Kato , Jun Fumioka
IPC: G11B5/012 , G11B5/39 , G11B5/62 , G11B5/64 , G11B5/66 , G11B5/73 , G11B5/84 , G11B5/78 , G11B5/82 , G11B17/00
CPC classification number: G11B5/012 , G11B5/39 , G11B5/64 , G11B5/656 , G11B5/66 , G11B5/7315 , G11B5/7325 , G11B5/8404
Abstract: A magnetic recording medium includes a non-magnetic substrate, and a magnetic layer provided on the non-magnetic substrate. The value of the product Br.sub.1 .delta. of the residual flux density Br.sub.1 of the magnetic layer determined in a recording direction and the thickness .delta. of the magnetic layer is not less than 5 G.mu.m and not more than 180 G.mu.m; the value of the ratio of Br.sub.1 to the residual flux density Br.sub.2 determined in a direction parallel to the substrate plane and perpendicular to the recording direction, Br.sub.1 /Br.sub.2, is not less than 1.3 and not more than 3; the surface of the non-magnetic substrate has texture grooves therein extending predominantly in the recording direction; and the average roughness factor Ra of the surface of the magnetic layer determined in a direction perpendicular to the substrate plane and perpendicular to the recording direction is not less than 0.3 nm and not more than 1.9 nm. Alternatively, the value of the product Br.delta. of the residual flux density Br of the magnetic layer determined in the recording direction and the thickness .delta. of the magnetic layer is not less than 5 G.mu.m and not more than 80 G.mu.m; and the value of the anisotropic magnetic field H.sub.k of the magnetic recording medium is not less than 7 kOe and not more than 20 kOe.
Abstract translation: 磁记录介质包括非磁性衬底和设置在非磁性衬底上的磁性层。 在记录方向上确定的磁性层的剩余磁通密度Br1和磁性层的厚度δ的乘积Br1δ的值不小于5Gm且不大于180Gm; 在平行于基板平面并垂直于记录方向Br1 / Br2的方向上确定的Br1与剩余通量密度Br2的比值不小于1.3且不大于3; 非磁性基板的表面具有主要在记录方向上延伸的织构槽; 并且在垂直于基板平面并垂直于记录方向的方向上确定的磁性层的表面的平均粗糙度Ra不小于0.3nm且不大于1.9nm。 或者，在记录方向上确定的磁性层的剩余磁通密度Br和磁性层的厚度δ的乘积Br delta的值不小于5Gm且不大于80Gm; 并且磁记录介质的各向异性磁场Hk的值不小于7kOe且不大于20kOe。
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公开(公告)号：US4950548A
公开(公告)日：1990-08-21
申请号：US355351
申请日：1989-05-23
Applicant: Kenji Furusawa , Katsuo Abe , Hiroyuki Kataoka , Tokuho Takagaki , Yoshihiro Shiroishi , Norikazu Tsumita
Inventor： Kenji Furusawa , Katsuo Abe , Hiroyuki Kataoka , Tokuho Takagaki , Yoshihiro Shiroishi , Norikazu Tsumita
CPC classification number: G11B5/656 , G11B5/72 , G11B5/738 , G11B5/851 , Y10S428/928 , Y10T428/12465 , Y10T428/12625 , Y10T428/12639 , Y10T428/12847 , Y10T428/12861 , Y10T428/12931
Abstract: The present invention relates to a magnetic recording medium for a magnetic disk unit or the like and, more particularly, to a magnetic recording medium having its recording layer made of a magnetic alloy film with uniform magnetic characteristics. The present magnetic recording medium comprises a non-magnetic substrate, at least two sputtered layers of chromium thin film having a bow-like columnar structure which chromium thin film is laminated on the substrate, another sputtered layer of a magnetic alloy thin film laminated on the chromium thin film, and a protective layer laminated on the magnetic alloy thin film. The present invention is effective in reducing modulation of regenerative output relatively independent of a texture roughness of the substrate.
Abstract translation: 本发明涉及一种用于磁盘单元等的磁记录介质，更具体地说，涉及一种具有由具有均匀磁特性的磁性合金膜制成的记录层的磁记录介质。 本磁记录介质包括非磁性基板，至少两个具有弓形柱状结构的铬薄膜溅射层，该铬薄膜层叠在基板上，另一层叠在该基板上的磁性合金薄膜溅射层 铬薄膜和层叠在磁性合金薄膜上的保护层。 本发明可有效地减少再生输出的调制，而不依赖于衬底的纹理粗糙度。
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公开(公告)号：US4842917A
公开(公告)日：1989-06-27
申请号：US88380
申请日：1987-08-24
Applicant: Tomoyuki Ohno , Yoshihiro Shiroishi , Sadao Hishiyama , Hiroyuki Suzuki , Takaaki Shirakura , Shinya Matsuoka , Makoto Sano , Takao Nakamura , Kazumasa Takagi , Tokuumi Fukazawa , Kenzo Susa
Inventor： Tomoyuki Ohno , Yoshihiro Shiroishi , Sadao Hishiyama , Hiroyuki Suzuki , Takaaki Shirakura , Shinya Matsuoka , Makoto Sano , Takao Nakamura , Kazumasa Takagi , Tokuumi Fukazawa , Kenzo Susa
IPC: G11B5/73
CPC classification number: G11B5/7325 , Y10S428/90 , Y10T428/24355
Abstract: A magnetic recording medium having a magnetic film formed on a substrate directly or through an underlayer from an alloy containing Co as a principal component. The central line average surface roughness Ra and maximum surface roughness Rmax of the magnetic film in a direction perpendicular to the direction of magnetic recording are selected so as to fall within the ranges of 1 nm.ltoreq.Ra.ltoreq.20 nm and Rmax.ltoreq.25 Ra, respectively, and the in-plane magnetic anisotropy energy Ku of the magnetic film is selected to fall within the range of 0.ltoreq.Ku.ltoreq.8.times.10.sup.5 erg/cm.sup.3. Thus, it is possible to minimize the value of modulation which represents the degree of variation of read output on the same circumference of a magnetic disk. It is also possible to reduce the noise generated in read and write operations by forming the magnetic film so as have no crystallographic orientation.
Abstract translation: 一种磁记录介质，其具有直接或通过底层从基板上形成的含有Co作为主要成分的合金的磁性膜。 选择磁性膜在垂直于磁记录方向的方向上的中心线平均表面粗糙度Ra和最大表面粗糙度Rmax，使其落入1nm≤Ra<20nm的范围内，并且Rmax < / = 25Ra，磁性膜的面内磁各向异性能Ku被选择在0≤K≤5×10 5Ω/ cm 3的范围内。 因此，可以将表示在磁盘的同一圆周上的读取输出的变化程度的调制值最小化。 也可以通过形成磁性膜来减少读取和写入操作中产生的噪声，从而没有结晶取向。
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公开(公告)号：US4651248A
公开(公告)日：1987-03-17
申请号：US500907
申请日：1983-06-03
Applicant: Kazuo Shiiki , Yoshihiro Shiroishi , Isamu Yuito , Kiminari Shinagawa , Hideo Fujiwara
Inventor： Kazuo Shiiki , Yoshihiro Shiroishi , Isamu Yuito , Kiminari Shinagawa , Hideo Fujiwara
CPC classification number: G11B5/3143 , G11B5/1278 , G11B5/31
Abstract: A thin-film magnetic head which has a structure wherein a spiral conductor coil having a plurality of turns is disposed between first and second magnetic layers being substantially in parallel with each other, through upper and lower inorganic insulator layers, and in which a part of the outermost turn of the conductor coil is exposed on a face opposite a magnetic recording medium along with the upper and lower inorganic insulator layers, to form a magnetic gap. This head can be readily manufactured by a manufacturing method including the step of forming the outermost turn of the conductor coil on the side of the face opposite the magnetic recording medium so as to be wider than any other part of the conductor coil, and the step of thereafter machining the face opposite the magnetic recording medium so as to expose the outermost turn of the conductor coil on the face opposite the magnetic recording medium. The magnetic head of the present invention is suited to high-density recording, and is high in recording and reproducing efficiencies and also in reliability.
Abstract translation: 具有以下结构的薄膜磁头：其中具有多个匝的螺旋导体线圈通过上下无机绝缘体层彼此基本上彼此平行地设置在第一和第二磁性层之间，并且其中一部分 导体线圈的最外圈与上下无机绝缘体层一起在与磁记录介质相对的面上露出，形成磁隙。 该头可以容易地通过制造方法制造，该方法包括以下步骤：在与磁记录介质相对的面的一侧形成导体线圈的最外圈，以便比导体线圈的任何其它部分宽，并且步骤 之后加工与磁记录介质相对的面，以便暴露在与磁记录介质相对的表面上的导体线圈的最外圈。 本发明的磁头适用于高密度记录，记录和再现效率高，可靠性高。
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Patent Agency Ranking
公开(公告)号：US4439794A
公开(公告)日：1984-03-27
申请号：US264706
申请日：1981-05-18
Applicant: Yoshihiro Shiroishi , Hideo Fujiwara , Takeshi Kimura , Noriyuki Kumasaka , Nobuo Kobayashi , Takeo Yamashita , Teizo Tamura , Hideo Zama , Mitsuhiro Kudo , Tsutomu Iimura
Inventor： Yoshihiro Shiroishi , Hideo Fujiwara , Takeshi Kimura , Noriyuki Kumasaka , Nobuo Kobayashi , Takeo Yamashita , Teizo Tamura , Hideo Zama , Mitsuhiro Kudo , Tsutomu Iimura
Abstract: A magnetic head which uses single crystal Mn-Zn ferrite containing up to 7% by weight of SnO.sub.2 occluded therein without being allowed to separate and which has such a construction that glass having a contraction rate lower than that of ferrite is filled in the narrowed portion near the gap, the plane forming the principal magnetic circuit of the core is allowed to coincide with the {110} plane of the ferrite and an angle .theta. between the direction inside the {110} plane of the ferrite and the gap-forming plane is from 5.degree. to 40.degree. or 85.degree. to 120.degree.. The magnetic head having such a construction has a reduced modulation noise and extremely excellent write-and-read characteristics.
Abstract translation: 使用含有高达7重量％的SnO 2的单晶Mn-Zn铁氧体的磁头，其不被分离，并且具有这样的结构，即将收缩率低于铁素体的玻璃填充到变窄部分 在间隙附近，形成芯的主磁路的平面允许与铁素体的{110}平面和铁氧体的{110}平面内的<100>方向之间的角度θ与间隙 - 成型面为5°〜40°或85°〜120°。 具有这种结构的磁头具有降低的调制噪声和极好的写和读特性。
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7.发明授权公开(公告)号：US08760779B2
公开(公告)日：2014-06-24
申请号：US13341098
申请日：2011-12-30
Applicant: William D. Johns , David L. Whitaker , Ikuya Tagawa , Yoshihiro Shiroishi
Inventor： William D. Johns , David L. Whitaker , Ikuya Tagawa , Yoshihiro Shiroishi
CPC classification number: G11B5/1278 , G11B5/3133 , G11B5/6088 , G11B2005/0021 , G11B2005/0024
Abstract: In one embodiment, a system includes a medium, a magnetic head having a write element adapted for writing data to the medium, a MAMR element and/or a TAMR element adapted for assisting recording on the medium, the MAMR element having a microwave-generating portion that receives current for operation thereof, the TAMR element having a localized heat-generating portion that receives current for operation thereof, and a read element adapted for reading data from the medium, a device adapted for measuring environmental conditions relating to the TAMR/MAMR elements and the medium, and a controller adapted for controlling operation of the magnetic head and adjusting operating parameters of the system based on the environmental conditions. The environmental conditions include temperature, a reproduced signal of the read element, and/or clearance between the TAMR/MAMR elements and the medium. The operating parameters include the clearance, amount of current injected to the TAMR/MAMR elements, and/or write current.
Abstract translation: 在一个实施例中，系统包括介质，具有适于向介质写入数据的写入元件的磁头，适于在介质上辅助记录的MAMR元件和/或TAMR元件，所述MAMR元件具有微波产生 接收用于其操作的电流的部分，所述TAMR元件具有接收用于其操作的电流的局部热产生部分和适于从所述介质读取数据的读取元件，适于测量与所述TAMR / MAMR有关的环境条件的装置 元件和介质，以及控制器，其适于控制磁头的操作并且基于环境条件调整系统的操作参数。 环境条件包括温度，读取元件的再生信号和/或TAMR / MAMR元件与介质之间的间隙。 操作参数包括间隙，注入到TAMR / MAMR元件的电流量和/或写入电流。
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8.发明申请公开(公告)号：US20130170060A1
公开(公告)日：2013-07-04
申请号：US13341098
申请日：2011-12-30
Applicant: William D. Johns , David L. Whitaker, JR. , Ikuya Tagawa , Yoshihiro Shiroishi
Inventor： William D. Johns , David L. Whitaker, JR. , Ikuya Tagawa , Yoshihiro Shiroishi
CPC classification number: G11B5/1278 , G11B5/3133 , G11B5/6088 , G11B2005/0021 , G11B2005/0024
Abstract: In one embodiment, a system includes a medium, a magnetic head having a write element adapted for writing data to the medium, a MAMR element and/or a TAMR element adapted for assisting recording on the medium, the MAMR element having a microwave-generating portion that receives current for operation thereof, the TAMR element having a localized heat-generating portion that receives current for operation thereof, and a read element adapted for reading data from the medium, a device adapted for measuring environmental conditions relating to the TAMR/MAMR elements and the medium, and a controller adapted for controlling operation of the magnetic head and adjusting operating parameters of the system based on the environmental conditions. The environmental conditions include temperature, a reproduced signal of the read element, and/or clearance between the TAMR/MAMR elements and the medium. The operating parameters include the clearance, amount of current injected to the TAMR/MAMR elements, and/or write current.
Abstract translation: 在一个实施例中，系统包括介质，具有适于向介质写入数据的写入元件的磁头，适于在介质上辅助记录的MAMR元件和/或TAMR元件，所述MAMR元件具有微波产生 接收用于其操作的电流的部分，所述TAMR元件具有接收用于其操作的电流的局部热产生部分和适于从所述介质读取数据的读取元件，适于测量与所述TAMR / MAMR有关的环境条件的装置 元件和介质，以及控制器，其适于控制磁头的操作并且基于环境条件调整系统的操作参数。 环境条件包括温度，读取元件的再生信号和/或TAMR / MAMR元件与介质之间的间隙。 操作参数包括间隙，注入到TAMR / MAMR元件的电流量和/或写入电流。
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公开(公告)号：US20100246054A1
公开(公告)日：2010-09-30
申请号：US12816093
申请日：2010-06-15
Applicant: Yoshihiro Shiroishi
Inventor： Yoshihiro Shiroishi
IPC: G11B21/02
CPC classification number: B82Y25/00 , B82Y10/00 , G11B5/00 , G11B5/09 , G11B5/313 , G11B5/3909 , G11B5/3967 , G11B5/484 , G11B5/656 , G11B5/66 , G11B5/7325 , G11B2005/0002 , G11B2005/0005 , G11B2005/3996
Abstract: A magnetic recording and reading device includes a perpendicular magnetic recording medium, a perpendicular magnetic head having a recording head width having a heat-generating portion and a reading head, a fine adjustment portion, and a R/W-IC. The perpendicular magnetic head is configured to perform magnetic recording on the recording medium while locally heating the recording medium so as to enable a change of the coercive force of the recording medium during the recording after correcting of the position of the perpendicular magnetic head by the fine adjustment portion is completed, and to perform reading of the magnetic recording information with the aid of the reading head after correcting of the position of the perpendicular magnetic head by the fine adjustment portion is completed.
Abstract translation: 磁记录和读取装置包括垂直磁记录介质，具有发热部分和读头的记录头宽度的垂直磁头，微调部分和R / W-IC。 垂直磁头被配置为在记录介质上执行磁记录，同时局部加热记录介质，以便在校正垂直磁头的位置之后能够在记录期间改变记录介质的矫顽力 调整部分完成，并且在通过微调部分校正垂直磁头的位置之后，借助于读取头来执行磁记录信息的读取。
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公开(公告)号：US20070127155A1
公开(公告)日：2007-06-07
申请号：US11699998
申请日：2007-01-31
Applicant: Yoshihiro Shiroishi
Inventor： Yoshihiro Shiroishi
IPC: G11B5/012
CPC classification number: B82Y25/00 , B82Y10/00 , G11B5/00 , G11B5/09 , G11B5/313 , G11B5/3909 , G11B5/3967 , G11B5/484 , G11B5/656 , G11B5/66 , G11B5/7325 , G11B2005/0002 , G11B2005/0005 , G11B2005/3996
Abstract: A magnetic recording and reading device includes a magnetic recording medium having a substrate and at least one magnetic recording layer formed above the substrate, a magnetic head enabling a data transfer rate of more than 50 MB/s and a recording density of more than 5 Gb/in2 on the magnetic recording medium, and a R/W-IC. The magnetic head includes a recording head and a reading head. The at least one magnetic recording layer contains (1) at least one metal element selected from a first group consisting of Co, Fe and Ni as a primary component, and (2) at least two elements selected from a second group consisting of Cr, Mo, W, V, Nb, Ta, Ti, Zr, Hf, Pd, Pt, Rh, Ir and Si.
Abstract translation: 磁记录和读取装置包括具有基板和形成在基板上方的至少一个磁记录层的磁记录介质，能够实现大于50MB / s的数据传输速率和大于5Gb的记录密度的磁头 /在＆lt; SUP＆gt; 2＆gt;中的R / W-IC。 磁头包括记录头和读头。 所述至少一个磁记录层含有（1）选自由Co，Fe和Ni组成的第一组中的至少一种金属元素作为主要成分，和（2）选自Cr， Mo，W，V，Nb，Ta，Ti，Zr，Hf，Pd，Pt，Rh，Ir和Si。
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