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1. 发明专利

JP2004030730A Magnetic recording device provided with overshoot current phase / amplitude control mechanism, control circuit and control method 有权
公开(公告)号：JP2004030730A
公开(公告)日：2004-01-29
申请号：JP2002182313
申请日：2002-06-24
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： IKEGAME HIROSHI , YAMASHITA TAKEO
IPC分类号： G11B5/09 , G11B5/00 , G11B5/012 , G11B5/02 , G11B20/10
CPC分类号： G11B5/012 , G11B5/02 , G11B20/10009 , G11B2005/0013
摘要： PROBLEM TO BE SOLVED: To enable a recording head to record information on a recording medium correctly by changing the amplitude and the timing of an overshoot current to be applied according to each recording current pulse.
SOLUTION: This circuit is a circuit for generating recording currents so as to perform information recording to a magnetic medium and the circuit has an AC current generating circuit, the generation circuit of the overshoot current and a processor. The processor analyzes recording data and transmits information to the overshoot current generator and the overshoot current generator generates overshoot currents based on the information.
COPYRIGHT: (C)2004,JPO

2. 发明专利

JP2000268336A MAGNETIC DISK APPARATUS 失效
公开(公告)号：JP2000268336A
公开(公告)日：2000-09-29
申请号：JP6601699
申请日：1999-03-12
申请人： HITACHI LTD
发明人： MARUYAMA YOJI , IKEGAME HIROSHI , TAKANO KOJI
IPC分类号： G11B5/60 , G11B5/48
摘要： PROBLEM TO BE SOLVED: To provide a constitution of a magnetic disk apparatus using an electric interconnection which satisfies an electric condition which realizes a high-frequency recording operation at 200 MHz or higher in the magnetic disk apparatus which is used for a computer, an information processor or the like. SOLUTION: A magnetic head which has at least a recording means to a magnetic recording medium and an electric interconnection 4 as a recording- current supply means to the magnetic head are formed on a suspension member 3 which supports the magnetic head mechanically. A recording current is supplied to a magnetic-head recording part by using the electric interconnection 4 whose characteristic impedance is higher than the maximum impedance of especially the magnetic-head recording part.

3. 发明专利

JP2007149155A Magnetic recording medium, its manufacturing method, and magnetic disk drive 审中-公开
标题翻译：磁记录介质，其制造方法和磁盘驱动
公开(公告)号：JP2007149155A
公开(公告)日：2007-06-14
申请号：JP2005338388
申请日：2005-11-24
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： IKEGAME HIROSHI , TSUCHIYA HIROKO , IGARASHI KAZUSUKATSU
IPC分类号： G11B5/65 , G11B5/667 , G11B5/855
CPC分类号： G11B5/855
摘要： PROBLEM TO BE SOLVED: To provide a medium manufacturing method, a recording medium and a magnetic disk drive for obtaining high recording density.
SOLUTION: A magnetic layer 1 is formed on a substrate 5 (a), and a nano-grain film 16 is formed on the magnetic layer 1 (b). Then, the nano-gain film is used as a mask, the magnetic layer is subjected to cutting (c), the nano-gain film is removed to form artificial fine magnetic grains 2 (d), and an artificial granular magnetic recording medium is obtained.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：提供一种用于获得高记录密度的介质制造方法，记录介质和磁盘驱动器。解决方案：在基板5（a）上形成磁性层1，在磁性层1（b）上形成纳米粒子膜16。然后，使用纳米增益膜作为掩模，对磁性层进行切割（c），除去纳米增益膜，形成人造细晶粒2（d），将人造粒状磁记录介质获得。版权所有（C）2007，JPO＆INPIT

4. 发明专利

JP2004101489A Method and apparatus for measuring current 有权
公开(公告)号：JP2004101489A
公开(公告)日：2004-04-02
申请号：JP2002267558
申请日：2002-09-13
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： IKEGAME HIROSHI
IPC分类号： G01R15/24 , G01R19/00
CPC分类号： G01R15/243
摘要： PROBLEM TO BE SOLVED: To provide a method and apparatus for precisely measuring a high-frequency current that flows in a transmission line of a circuit with a low impedance as a load. SOLUTION: A magnetooptic element 18 is disposed in the magnetic field generated by a current flowing through a transmission line 16. The magnetooptic element 18 is impressed with a bias magnetic field by a magnetic field generator, and its position is controlled so as to produce maximum a detection sensitivity for an incident polarized light. The current waveform is detected by measuring the change in the polarization state of the deflection light from the magnetooptic element 18. So, without working on a circuit to be measured (nondestructively) nor giving an effect on an instrument impedance (with non-electric invasion), a current waveform is measured at high sensitivity over a wide band (with high time resolution). COPYRIGHT: (C)2004,JPO

5. 发明专利

JP2006127681A Magnetic recording medium and its manufacturing method, and magnetic recording and reproducing device 审中-公开
标题翻译：磁记录介质及其制造方法和磁记录和再现装置
公开(公告)号：JP2006127681A
公开(公告)日：2006-05-18
申请号：JP2004316616
申请日：2004-10-29
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： TSUCHIYA HIROKO , MOCHIZUKI MASABUMI , TAKAHASHI TERUO , IKEGAME HIROSHI
IPC分类号： G11B5/667 , G11B5/64 , G11B5/65 , G11B5/738 , G11B5/84
CPC分类号： G11B5/855 , G11B5/667 , G11B5/7325 , G11B5/8404
摘要： PROBLEM TO BE SOLVED: To provide a discrete track type perpendicular magnetic recording medium which is excellent in crystal orientation and perpendicular magnetic anisotropy of a magnetic recording layer, obviates deterioration of the magnetic characteristics of the magnetic recording layer due to processing, is inexpensive in manufacturing cost, and does not require a complicated manufacturing process and to provide its manufacturing method. SOLUTION: The perpendicular magnetic recording medium has rugged pattern structure comprising projecting parts corresponding to the positions of data tracks 55 for recording magnetic information and recessed parts corresponding to the positions between the data tracks on the surface on a medium floating surface side of a soft magnetic backing layer 52 and is laminated with a base layer 53 and the magnetic recording layer 54 for crystal orientation control along the rugged pattern structure on the projecting parts and the recessed parts without omission. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：为了提供磁记录层的晶体取向和垂直磁各向异性优异的离散轨道型垂直磁记录介质，消除了由于处理而导致的磁记录层的磁特性的劣化，是制造成本低廉，并且不需要复杂的制造工艺并提供其制造方法。解决方案：垂直磁记录介质具有粗糙的图案结构，其包括对应于用于记录磁信息的数据轨道55的位置的突出部分和对应于在介质浮动表面侧的表面上的数据轨道之间的位置的凹部柔性磁性背衬层52，并且在突出部分和凹陷部分上沿着凹凸图案结构层叠有基底层53和用于晶体取向控制的磁记录层54，而没有遗漏。版权所有（C）2006，JPO＆NCIPI

6. 发明专利

JP2005071464A Magnetic recording and reproducing device 审中-公开
标题翻译：磁记录和再现设备
公开(公告)号：JP2005071464A
公开(公告)日：2005-03-17
申请号：JP2003299472
申请日：2003-08-25
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： IKEGAME HIROSHI
IPC分类号： G11B5/60 , G11B21/21
摘要： PROBLEM TO BE SOLVED: To provide a magnetic disk device for obtaining a magnetic head suspension integral with a transmission line excellent in a high-frequency transmission characteristic and a high data rate by reducing an eddy current loss and a skin effect loss peculiar to a differential transmission line used in a magnetic head to improve the transmission characteristic in high frequencies, and using this improved transmission line.
SOLUTION: In the magnetic recording and reproducing device provided with a magnetic recording medium, a magnetic head with a magnetic recording head and a reproducing head, a read/write IC, and a transmission line for connecting the magnetic recording head and the reproducing head to the read/write IC, the transmission line is characterized by having a groove formed along the direction of a current, or the transmission line is characterized by having a slit formed along the direction of the a current, or the transmission line is characterized by having a pit not penetrating the conductor, or the transmission line is characterized by having a hole penetrating the conductor.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种磁盘装置，用于通过减少涡流损耗和特殊的皮肤效应损失来获得与高频传输特性和高数据速率优异的传输线一体化的磁头悬架涉及在磁头中使用的差分传输线，以改善高频率的传输特性，并使用这种改进的传输线。解决方案：在具有磁记录介质的磁记录和再现装置中，具有磁记录头和再现头的磁头，读/写IC和用于连接磁记录头和再现头到读/写IC，传输线的特征在于具有沿电流方向形成的沟槽，或者传输线的特征在于沿着电流方向形成有狭缝，或者传输线为其特征在于具有不穿透所述导体的凹坑，或者所述传输线的特征在于具有贯穿所述导体的孔。版权所有（C）2005，JPO＆NCIPI

7. 发明专利

JP2001023152A PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC MEMORY DEVICE USING THE SAME 失效
公开(公告)号：JP2001023152A
公开(公告)日：2001-01-26
申请号：JP19200099
申请日：1999-07-06
申请人： HITACHI LTD
发明人： HIRAYAMA YOSHIYUKI , FUTAMOTO MASAAKI , HONDA YUKIO , KIKUKAWA ATSUSHI , YAMASHITA TAKEO , IKEGAME HIROSHI
IPC分类号： G11B5/82 , G11B5/64 , G11B5/65
摘要： PROBLEM TO BE SOLVED: To enable high-density recording and high-speed transfer to be performed by setting the ratio of residual magnetization of a perpendicular magnetic recording layer to saturation magnetization to be larger towards the outer circumference of a disk in a recording area. SOLUTION: In order to make an overwrite characteristic not smaller than 30 dB in the perpendicular magnetic recording medium and the coercive force reduced. The value of the coercive force is reduced particularly at the outer circumferential part. The coercive force is preferably made smaller towards the outer circumference to set the overwrite characteristic and the medium S/N to high levels at the same time all over the disk face. Increasing the squareness ratio of a magnetic recording film and reducing the coercive force towards the outer circumference can be easily accomplished with the use of a method of adjusting an erosion area or the like, thereby eventually increasing a film thickness of the magnetic recording layer and reducing a film thickness of an undercoat layer towards the outer circumference.

8. 发明专利

JP2008052850A Magnetic recording medium and magnetic recording and reproducing device 有权
标题翻译：磁记录介质和磁记录和再现装置
公开(公告)号：JP2008052850A
公开(公告)日：2008-03-06
申请号：JP2006229709
申请日：2006-08-25
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： TSUCHIYAMA RYUJI , MOCHIZUKI MASABUMI , ONO KYOSUKE , TSUCHIYA HIROKO , IKEGAME HIROSHI
IPC分类号： G11B5/65 , G11B5/72 , G11B5/82
CPC分类号： G11B5/82 , B82Y10/00 , G11B5/743 , G11B5/855
摘要： PROBLEM TO BE SOLVED: To reduce meniscus attractive force while preventing writing in an adjacent track in a discrete track medium and a patterned medium.
SOLUTION: A magnetic recording medium and a magnetic disk device excellent in high density recording and high reliability are provided by forming a magnetic layer of a land part and a patterned part of the discrete track medium and the patterned medium in a cylindrical shell shape and a spherical shell shape having fixed film thickness and changing a height of a cylindrical shell shape protrusion and a height of a spherical shell shape protrusion from 5 nm to 30 nm according to a radial position.
COPYRIGHT: (C)2008,JPO&INPIT

9. 发明专利

JP2000200444A INFORMATION STORAGE DEVICE 失效
公开(公告)号：JP2000200444A
公开(公告)日：2000-07-18
申请号：JP87299
申请日：1999-01-06
申请人： HITACHI LTD
发明人： IKEGAME HIROSHI , IDE HIROSHI
IPC分类号： G11B7/24 , G11B7/007
摘要： PROBLEM TO BE SOLVED: To increase data transfer speed by providing a data format with a recording medium constituted of plural spiral tracks and thereby reducing the access frequency of a recording reproducing element. SOLUTION: Two spiral data tracks are formed from the center of disk medium towards the outer periphery, recording and reproduction and performed by using a multi-head against the recording medium having such n-turn spiral format. In a device having a concentric format and a recording/reproducing element, after one round portion of the disk is transferred from the sector 1 to sector n in the track N, the recording/reproducing element seeks the next track N+1, to have a rotational delay until the target sector n+1 appears, and transfers data as the sector n+1, sector n+2,.... In the combination of a single spiral format and a recording/reproducing element, are continuously transferred in order the sector 1, sector 2,... sector n without the need of seek for each round and a rotational delay.

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