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1. 发明专利

JP2000276727A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JP2000276727A
公开(公告)日：2000-10-06
申请号：JP8054499
申请日：1999-03-24
申请人： SHOWA DENKO KK , UNIV WASEDA
发明人： SHIMIZU KENJI , ITO AKIRA , YOSHIKAWA TOSHIHIKO , SAKAI HIROSHI , AISAKA TETSUYA
IPC分类号： G11B5/66 , G11B5/64 , G11B5/738
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording medium having excellent noise characteristics. SOLUTION: A carbon base film 2 is formed on a substrate 1, on which a perpendicular magnetic film 4 having the axis of easy magnetization aligned perpendicularly to the substrate is formed. The carbon base film 2 is formed to >100 Å and

2. 发明专利

JPH11283229A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH11283229A
公开(公告)日：1999-10-15
申请号：JP7984798
申请日：1998-03-26
申请人： SHOWA DENKO KK , UNIV WASEDA
发明人： YOSHIKAWA TOSHIHIKO , SAKAWAKI AKIRA , SAKAI HIROSHI , AISAKA TETSUYA
IPC分类号： G11B5/65 , G11B5/66
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording medium with which a general purpose signal processing method can be applied as it is for an inside magnetic recording medium and noise characteristics are improved. SOLUTION: An in-plane magnetic film 3 with its axis of easy magnetization oriented in the inside direction in respect of a substrate and a vertical magnetic film 6 with the axis of easy magnetization oriented vertically to the substrate are formed on a substrate 1, wherein the inside magnetic film 3 is provided on the side of the substrate 1 rather than the vertical magnetic film 6, and its coercive force Hc is set at 1500 to 4000Oe, a residual magnetized film thickness product BrT is set at 20 to 100 Gμm, the coercive force Hc of the vertical magnetic film 6 is set at 1500 to 4000Oe and the film thickness is set at 100 to 1000 Å.

3. 发明专利

JPH11283228A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH11283228A
公开(公告)日：1999-10-15
申请号：JP7984698
申请日：1998-03-26
申请人： SHOWA DENKO KK , UNIV WASEDA
发明人： YOSHIKAWA TOSHIHIKO , SAKAWAKI AKIRA , SAKAI HIROSHI , AISAKA TETSUYA
IPC分类号： G11B5/64 , G11B5/66 , G11B5/738
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording medium having excellent noise characteristics in which the signal processing method generally used when an inside magnetic recording medium is used can be used as it is. SOLUTION: This magnetic recording medium has an inside magnetic film 3 with the axis of easy magnetization oriented in the plane direction of the substrate, and a perpendicular magnetic film 6 with the axis of easy magnetization perpendicular to the substrate 1 on the substrate 1. The inside magnetic film 3 is formed nearer to the substrate 1 than the perpendicular magnetic film 6, and a separation film 4 is formed between the inside magnetic film 3 and the perpendicular magnetic film 6. The separation film 4 essentially consists of one or more elements selected from Ta, Re, CuTi, SiC, W, NiP, Zr, Ti and C.

4. 发明专利

JPH11283227A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH11283227A
公开(公告)日：1999-10-15
申请号：JP7984598
申请日：1998-03-26
申请人： SHOWA DENKO KK , UNIV WASEDA
发明人： YOSHIKAWA TOSHIHIKO , SAKAWAKI AKIRA , SAKAI HIROSHI , AISAKA TETSUYA
IPC分类号： G11B5/64 , G11B5/65 , G11B5/66 , G11B5/738
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording medium having excellent noise preventing characteristics in which the signal processing method generally used when an intraplane magnetic recording medium is used can be used as it is. SOLUTION: This magnetic recording medium has an inside magnetic film 3, a separation film 4 comprising a material which can non-epitaxially grow on the inside magnetic film, a nonmagnetic intermediate layer 5 having a hcp structure, and a perpendicular magnetic film 6 on a substrate 1. The nonmagnetic intermediate layer 5 essentially consists of a Co alloy containing 25 to 50 at.% Cr, 0 to 15 at.% Pt, 0 to 10 at.% of one or more elements of Ta, Zr, Cu, Re, and the balance Co. The perpendicular magnetic film 6 essentially consists of a Co alloy containing 16 to 30 at.% Cr, 0 to 15 at.% Pt, 2 to 10 at.% Ta, 0 to 5 at.% Zr and the balance Co.

5. 发明专利

JP2000222715A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JP2000222715A
公开(公告)日：2000-08-11
申请号：JP2325699
申请日：1999-01-29
申请人： SHOWA DENKO KK
发明人： YOSHIKAWA TOSHIHIKO , SAKAWAKI AKIRA , SAKAI HIROSHI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65
摘要： PROBLEM TO BE SOLVED: To improve the signal-to-noise ratio and the halfwidth of solitary waves without deteriorating overwriting characteristics and off-track characteristics by forming a nonmagnetic primary film, magnetic recording film, soft magnetic film and protective film on a nonmagnetic substrate, controlling the coercive force to a specified value or higher, and controlling the film thickness of the soft magnetic film to a specified range. SOLUTION: This medium is produced by successively forming a nonmagnetic primary film 2, magnetic recording film 3, soft magnetic film 4 and protective film 5 on a nonmagnetic substrate 1. Preferably, the coercive force is controlled to >=2500 Oe and the film thickness of the soft magnetic film is controlled to 5 to 50 Å. In the obtd. magnetic recording medium, the extract amt. of Ni can be controlled to

6. 发明专利

JP2008135132A Method of manufacturing hard disk drive, method for adjusting floating height of magnetic head, and hard disk drive 审中-公开
标题翻译：制造硬盘驱动器的方法，用于调整磁头浮动高度的方法和硬盘驱动器
公开(公告)号：JP2008135132A
公开(公告)日：2008-06-12
申请号：JP2006321595
申请日：2006-11-29
申请人： Showa Denko Kk , 昭和電工株式会社
发明人： YOSHIKAWA TOSHIHIKO , SUEOKA YOSHITO
IPC分类号： G11B21/21 , G11B5/592 , G11B5/60
CPC分类号： G11B5/6005 , G11B5/6064
摘要： PROBLEM TO BE SOLVED: To provide a method of manufacturing a hard disk drive which can precisely control the floating height of the magnetic head while completely preventing the magnetic head damages due to the contact with the magnetic recording medium, and also to provide a hard disk drive and a floating height adjusting method of the magnetic head.
SOLUTION: This manufacturing method provides for a hard disk drive incorporating a magnetic recording medium and a head gimbal assembly 20 having a magnetic head 3 facing the magnetic recording medium to record and reproduce information. It includes a step of detecting the contact of the magnetic recording medium and the magnetic head 3 with the sensor 2 attached to the head gimbal assembly 20, and adjusting the head floating height by using the adjusting mechanism to control the floating height of the magnetic head 3 on the magnetic recording medium.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供一种制造硬盘驱动器的方法，其可以精确地控制磁头的浮动高度，同时完全防止由于与磁记录介质的接触而导致的磁头损坏，并且还提供磁头驱动器和磁头浮动高度调整方法。解决方案：该制造方法提供了一种包含磁记录介质的硬盘驱动器和具有面向磁记录介质的磁头3的磁头万向架组件20以记录和再现信息。它包括检测磁记录介质和磁头3与安装在头万向架组件20上的传感器2的接触的步骤，并且通过使用调节机构来调节磁头浮动高度以控制磁头的浮动高度 3在磁记录介质上。版权所有（C）2008，JPO＆INPIT

7. 发明专利

JP2002183945A MAGNETIC RECODING MEDIUM, METHOD FOR MANUFACTURING THE SAME, MAGNETIC RECORDING AND REPRODUCING DEVICE, METHOD AND DEVICE FOR INSPECTING MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JP2002183945A
公开(公告)日：2002-06-28
申请号：JP2000373212
申请日：2000-12-07
申请人： SHOWA DENKO KK
发明人： YOSHIKAWA TOSHIHIKO , KATO JUNYA , KUSUKI KATSUTERU
IPC分类号： G11B5/65 , G11B5/00 , G11B5/82 , G11B5/84
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a magnetic recording medium in which writing and recognition of servo information can be performed with high accuracy. SOLUTION: While a magnetic head 48 is made to levitate and run over a sample M to observe the frequency characteristics of the signals reproduced from the magnetic head 48, the levitating and running test is carried out by (I) decreasing the number of revolution of the sample M until local increase in the frequency component of the output of the reproduced signals occurs and then (II) increasing the number of revolution of the sample M until the aforementioned output increase disappears. The test is carried out so as to confirm that the difference between the number of revolution of the sample when the increase in the output occurs in (I) and the number of revolution of the sample when the increased output disappears in (II) becomes equal to or smaller than the predetermined referential value.

8. 发明专利

JP2008071420A Magnetic recording medium and magnetic recording/reproducing apparatus 审中-公开
标题翻译：磁记录介质和磁记录/再现装置
公开(公告)号：JP2008071420A
公开(公告)日：2008-03-27
申请号：JP2006249358
申请日：2006-09-14
申请人： Showa Denko Kk , 昭和電工株式会社
发明人： YOSHIKAWA TOSHIHIKO
IPC分类号： G11B5/667 , G11B5/64 , G11B5/738 , H01F10/30
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording medium which resolve heat decay problem without degrading electromagnetic conversion characteristic (especially for OW characteristic) for attaining high recording density by improving SNR and narrowing PW50 even when a magnetic core having high saturation flux density is employed in a writing head.
SOLUTION: The magnetic recording medium comprises a magnetic recording film 3, a soft magnetic film 4, and a protection film 5 on a non magnetic base 1. While the coercive force of the magnetic recording film 3 is equal to or more than 2,500 Oe, the film thickness of the soft magnetic film 4 is within 0.2 to 0.5 nm, and the saturation flux density of the soft magnetic film 4 is equal to or more than 1.5 T.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：即使当具有高饱和磁通量的磁芯时，提供解决热衰减问题而不降低电磁转换特性（特别是OW特性）的磁记录介质，以获得高的记录密度，通过提高SNR和缩小PW50 密度用于书写头。解决方案：磁记录介质包括非磁性基体1上的磁记录膜3，软磁膜4和保护膜5.当磁记录膜3的矫顽力等于或大于 2OOOe时，软磁性膜4的膜厚在0.2〜0.5nm的范围内，软磁性膜4的饱和磁通密度为1.5T以上。（C）2008，JPO＆INPIT

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