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1. 发明授权

US07289284B2 Stray field detector, magnetic disk drive, and method of head escaping 失效
标题翻译：杂散场检测器，磁盘驱动器和头部逃逸方法
公开(公告)号：US07289284B2
公开(公告)日：2007-10-30
申请号：US11195202
申请日：2005-08-01
申请人： Reiko Arai , Takehiko Hamaguchi , Atsushi Kikugawa , Hideaki Maeda , Liping Shen , Mikio Suzuki
发明人： Reiko Arai , Takehiko Hamaguchi , Atsushi Kikugawa , Hideaki Maeda , Liping Shen , Mikio Suzuki
IPC分类号： G11B5/02
CPC分类号： G11B5/012 , G11B5/02 , G11B5/1278 , G11B5/3903 , G11B27/36 , G11B2005/0016 , G11B2005/0029 , G11B2220/20
摘要： Embodiments of the invention prevent demagnetization or degaussing of recorded magnetizations, even if a stray field is applied. In one embodiment, an output of a read head including a magneto-resistive effect element is inputted to a stray field detector through a DC amplifier and a DC filter. The stray field detector monitors dc components of the output from the read head, and escapes a head from above a magnetic recording medium.
摘要翻译：即使应用杂散场，本发明的实施例也防止记录磁化的退磁或消磁。在一个实施例中，包括磁阻效应元件的读出头的输出通过DC放大器和DC滤波器输入到杂散场检测器。杂散场检测器监测来自读头的输出的直流分量，并从磁记录介质的上方排出头。

2. 发明申请

US20060028747A1 Stray field detector, magnetic disk drive, and method of head escaping 失效
标题翻译：杂散场检测器，磁盘驱动器和头部逃逸方法
公开(公告)号：US20060028747A1
公开(公告)日：2006-02-09
申请号：US11195202
申请日：2005-08-01
申请人： Reiko Arai , Takehiko Hamaguchi , Atsushi Kikugawa , Hideaki Maeda , Liping Shen , Mikio Suzuki
发明人： Reiko Arai , Takehiko Hamaguchi , Atsushi Kikugawa , Hideaki Maeda , Liping Shen , Mikio Suzuki
IPC分类号： G11B5/02 , G11B27/36
CPC分类号： G11B5/012 , G11B5/02 , G11B5/1278 , G11B5/3903 , G11B27/36 , G11B2005/0016 , G11B2005/0029 , G11B2220/20
摘要： Embodiments of the invention prevent demagnetization or degaussing of recorded magnetizations, even if a stray field is applied. In one embodiment, an output of a read head including a magneto-resistive effect element is inputted to a stray field detector through a DC amplifier and a DC filter. The stray field detector monitors dc components of the output from the read head, and escapes a head from above a magnetic recording medium.
摘要翻译：即使应用杂散场，本发明的实施例也防止记录磁化的退磁或消磁。在一个实施例中，包括磁阻效应元件的读出头的输出通过DC放大器和DC滤波器输入到杂散场检测器。杂散场检测器监测来自读头的输出的直流分量，并从磁记录介质的上方排出头。

3. 发明授权

US07486485B2 Perpendicular hard disk drive resistive against external magnetic field 失效
标题翻译：垂直硬盘驱动器抵抗外部磁场
公开(公告)号：US07486485B2
公开(公告)日：2009-02-03
申请号：US11262531
申请日：2005-10-28
申请人： Takehiko Hamaguchi , Yoshihisa Kamo , Hideaki Maeda , Yukiya Shimizu , Ikuya Tagawa , Tetsuo Yuki
发明人： Takehiko Hamaguchi , Yoshihisa Kamo , Hideaki Maeda , Yukiya Shimizu , Ikuya Tagawa , Tetsuo Yuki
IPC分类号： G11B5/127
CPC分类号： G11B5/3143 , G11B5/11 , G11B5/1278
摘要： Embodiments of the invention prevent a decrease in magnetization or demagnetization from occurring to recording magnetization regardless of a direction in which a stray field is applied. In one embodiment, an apparatus for data storage system comprises a head having a magnetic field shield in the vicinity of a main pole, and a cover of the device, using a constituent material with a magnetic field shielding effect, across the cover, or at part thereof. When a stray field in a direction perpendicular to a recording medium is applied, the effect of the magnetic field is alleviated by the magnetic field shield installed in the vicinity of the main pole. In such a case, it need only be sufficient to form the magnetic field shield in a shape optimum for removing the stray field in the perpendicular direction only. When a stray field in a direction horizontal in relation to the recording medium is applied, the magnetic field acting on the recording medium is removed by the cover of the device comprising a magnetic component.
摘要翻译：本发明的实施例不管施加杂散场的方向如何，都防止磁化或退磁的发生发生到记录磁化。在一个实施例中，一种用于数据存储系统的装置包括在主极附近具有磁场屏蔽的头部，以及使用具有磁场屏蔽效应的组成材料穿过该盖的装置的盖，或者在的一部分。当施加与记录介质垂直的方向上的杂散场时，通过安装在主极附近的磁场屏蔽来减轻磁场的影响。在这种情况下，只需要使磁场屏蔽形成为仅在垂直方向上去除杂散场的最佳形状。当施加相对于记录介质的水平方向的杂散场时，作用在记录介质上的磁场被包括磁性部件的装置的盖子去除。

4. 发明申请

US20080186629A1 Method of producing a magnetic disk device with servo data recorded on magnetic disk, head amplifier for magnetic disk device and disk device 审中-公开
标题翻译：制造具有记录在磁盘上的伺服数据的磁盘装置的方法，用于磁盘装置的磁头放大器和磁盘装置
公开(公告)号：US20080186629A1
公开(公告)日：2008-08-07
申请号：US12009215
申请日：2008-01-16
申请人： Takehiko Hamaguchi , Yukiya Shimizu , Satoshi Ohki , Hideaki Maeda
发明人： Takehiko Hamaguchi , Yukiya Shimizu , Satoshi Ohki , Hideaki Maeda
IPC分类号： G11B5/33
CPC分类号： G11B5/59633 , G11B5/59666
摘要： Embodiments of the present invention provide a method of producing a magnetic disk device in which a plurality of heads can appropriately record servo data on a magnetic disk. The method of producing the magnetic disk device according to one embodiment includes the steps of: attaching a magnetic disk, a plurality of heads and head amplifier circuit to the magnetic disk device; and recording the servo data input through the head amplifier circuit with the plurality of heads on the magnetic disk all at once; wherein the head amplifier circuit includes a plurality of amplifiers provided corresponding to the plurality of heads respectively and a plurality of registers which is provided corresponding to the plurality of amplifiers respectively and holds set values determining the amplification of the amplifiers, and the step of recording the servo data is conducted with the plurality of registers included in the head amplifier circuit individually set.
摘要翻译：本发明的实施例提供一种制造磁盘装置的方法，其中多个磁头可以将伺服数据适当地记录在磁盘上。根据一个实施例的制造磁盘装置的方法包括以下步骤：将磁盘，多个磁头和磁头放大器电路连接到磁盘装置; 并且通过头放大器电路输入的伺服数据与多个磁头一起记录在磁盘上; 其中所述头放大器电路包括分别与所述多个磁头相对应地设置的多个放大器和分别对应于所述多个放大器设置的多个寄存器，并且保持确定放大器的放大的设定值，以及记录伺服数据与包括在头放大器电路中的多个寄存器分别设置一起进行。

5. 发明申请

US20060092556A1 Perpendicular hard disk drive resistive against external magnetic field 失效
公开(公告)号：US20060092556A1
公开(公告)日：2006-05-04
申请号：US11262531
申请日：2005-10-28
申请人： Takehiko Hamaguchi , Yoshihisa Kamo , Hideaki Maeda , Yukiya Shimizu , Ikuya Tagawa , Tetsuo Yuki
发明人： Takehiko Hamaguchi , Yoshihisa Kamo , Hideaki Maeda , Yukiya Shimizu , Ikuya Tagawa , Tetsuo Yuki
IPC分类号： G11B17/00
CPC分类号： G11B5/3143 , G11B5/11 , G11B5/1278
摘要： Embodiments of the invention prevent a decrease in magnetization or demagnetization from occurring to recording magnetization regardless of a direction in which a stray field is applied. In one embodiment, an apparatus for data storage system comprises a head having a magnetic field shield in the vicinity of a main pole, and a cover of the device, using a constituent material with a magnetic field shielding effect, across the cover, or at part thereof. When a stray field in a direction perpendicular to a recording medium is applied, the effect of the magnetic field is alleviated by the magnetic field shield installed in the vicinity of the main pole. In such a case, it need only be sufficient to form the magnetic field shield in a shape optimum for removing the stray field in the perpendicular direction only. When a stray field in a direction horizontal in relation to the recording medium is applied, the magnetic field acting on the recording medium is removed by the cover of the device comprising a magnetic component.

6. 发明授权

US07474493B2 Alternative DC-burst servo pattern for perpendicular recording 失效
标题翻译：用于垂直记录的备用直流脉冲串伺服模式
公开(公告)号：US07474493B2
公开(公告)日：2009-01-06
申请号：US10701593
申请日：2003-11-06
申请人： Takehiko Hamaguchi , Hideaki Maeda , Kazuhisa Shishida , Yasutaka Nishida
发明人： Takehiko Hamaguchi , Hideaki Maeda , Kazuhisa Shishida , Yasutaka Nishida
IPC分类号： G11B5/596
CPC分类号： G11B5/59655
摘要： The invention provides a servo pattern that is stable for long time, easily writable, and excellent in S/N. DC-signal area included in a burst area of a servo pattern comprises combination of positive and negative DC-signals, low-density dummy bit, or pattern having phases that are deviated each other so that the sum of magnetization of the burst area of the servo pattern is equalized to 0.
摘要翻译：本发明提供了长时间稳定，易于写入且S / N优异的伺服图形。包括在伺服模式的脉冲串区域中的DC信号区域包括正和负DC信号的组合，低密度虚拟位或具有彼此偏离的相位的模式，使得伺服模式等于0。

7. 发明授权

US07365933B2 Servo information recording method, magnetic recording media, and magnetic disk apparatus 失效
标题翻译：伺服信息记录方法，磁记录介质和磁盘装置
公开(公告)号：US07365933B2
公开(公告)日：2008-04-29
申请号：US11331921
申请日：2006-01-12
申请人： Takehiko Hamaguchi , Hideaki Maeda , Kazuaki Usui , Kazuhisa Shishida , Takashi Konishi
发明人： Takehiko Hamaguchi , Hideaki Maeda , Kazuaki Usui , Kazuhisa Shishida , Takashi Konishi
IPC分类号： G11B5/596
CPC分类号： G11B5/59655
摘要： Embodiments of the invention provide optimum servo patterns for perpendicular magnetic recording method. In one embodiment, a burst field of servo patterns is composed of burst-signal parts in each of which a constant frequency occurs successively and zero-signal parts each of which has been demagnetized to a state of zero-magnetization, and the total magnetization of the burst field is made approximately 0. The zero signal portions are formed by shutting off a write current at a time during an operation to record servo patterns on a disk initialized to a state of zero-magnetization. The total magnetization of all servo patterns is made approximately 0 by encoding an address mark field and a track code field of servo patterns by a phase shift method.
摘要翻译：本发明的实施例提供了用于垂直磁记录方法的最佳伺服模式。在一个实施例中，伺服模式的脉冲串区域由突发信号部分组成，其中每个脉冲串信号部分连续出现恒定频率，零信号部分已经被去磁到零磁化状态，并且总磁化强度脉冲串区域被制成大约0.零信号部分是通过在操作期间的一个时刻关闭写入电流来形成的，以便在初始化为零磁化的状态的盘上记录伺服模式。通过相移法对伺服模式的地址标记场和轨迹代码域进行编码，使所有伺服模式的总磁化大致为0。

8. 发明申请

US20060152843A1 Servo information recording method, magnetic recording media, and magnetic disk apparatus 失效
标题翻译：伺服信息记录方法，磁记录介质和磁盘装置
公开(公告)号：US20060152843A1
公开(公告)日：2006-07-13
申请号：US11331921
申请日：2006-01-12
申请人： Takehiko Hamaguchi , Hideaki Maeda , Kazuaki Usui , Kazuhisa Shishida , Takashi Konishi
发明人： Takehiko Hamaguchi , Hideaki Maeda , Kazuaki Usui , Kazuhisa Shishida , Takashi Konishi
IPC分类号： G11B21/02
CPC分类号： G11B5/59655
摘要： Embodiments of the invention provide optimum servo patterns for perpendicular magnetic recording method. In one embodiment, a burst field of servo patterns is composed of burst-signal parts in each of which a constant frequency occurs successively and zero-signal parts each of which has been demagnetized to a state of zero-magnetization, and the total magnetization of the burst field is made approximately 0. The zero signal portions are formed by shutting off a write current at a time during an operation to record servo patterns on a disk initialized to a state of zero-magnetization. The total magnetization of all servo patterns is made approximately 0 by encoding an address mark field and a track code field of servo patterns by a phase shift method.
摘要翻译：本发明的实施例提供了用于垂直磁记录方法的最佳伺服模式。在一个实施例中，伺服模式的脉冲串区域由突发信号部分组成，其中每个脉冲串信号部分连续出现恒定频率，零信号部分已经被去磁到零磁化状态，并且总磁化强度脉冲串区域被制成大约0.零信号部分是通过在操作期间的一个时刻关闭写入电流来形成的，以便在初始化为零磁化的状态的盘上记录伺服模式。通过相移法对伺服模式的地址标记场和轨迹代码域进行编码，使所有伺服模式的总磁化大致为0。

9. 发明授权

US08717708B2 Magnetic head and magnetic disk apparatus 有权
标题翻译：磁头和磁盘设备
公开(公告)号：US08717708B2
公开(公告)日：2014-05-06
申请号：US12315523
申请日：2008-12-03
申请人： Mao Nishiyama , Shuji Nishida , Hideaki Maeda , Masafumi Mochizuki
发明人： Mao Nishiyama , Shuji Nishida , Hideaki Maeda , Masafumi Mochizuki
IPC分类号： G11B5/127
CPC分类号： G11B5/3166 , G11B5/1278 , G11B5/3116 , G11B5/315 , G11B5/3169 , Y10T428/1171 , Y10T428/1193
摘要： Embodiments of the present invention provide a magnetic head for perpendicular magnetic recording, and a magnetic disk apparatus capable of preventing data erasure caused by alignment marks. In an embodiment, the magnetic head includes a head element including at least a main pole having a pole face on a flying surface and an auxiliary pole; alignment marks made of a magnetic material and used to detect the amount of lapping work when lapping the pole face of the main pole; and members made of a magnetic material, continuously extending in either direction with respect to the position of the main pole from within the alignment marks outward at least beyond the alignment marks.
摘要翻译：本发明的实施例提供一种用于垂直磁记录的磁头，以及能够防止由对准标记引起的数据擦除的磁盘装置。在一个实施例中，磁头包括头元件，头元件至少包括在飞行表面上具有极面的主极和辅助极; 由磁性材料制成的对准标记，用于在研磨主极的极面时检测研磨作业的数量; 以及由磁性材料制成的构件，其在相对于主极的位置的任一方向上从对准标记内部至少超过对准标记向外延伸。

10. 发明授权

US08107180B2 Hard-disk drive and control method for magnetic recording on a patterned medium of the hard-disk drive 有权
标题翻译：用于在硬盘驱动器的图案化介质上进行磁记录的硬盘驱动器和控制方法
公开(公告)号：US08107180B2
公开(公告)日：2012-01-31
申请号：US12505085
申请日：2009-07-17
申请人： Shuji Nishida , Yasutaka Nishida , Masafumi Mochizuki , Hideaki Maeda
发明人： Shuji Nishida , Yasutaka Nishida , Masafumi Mochizuki , Hideaki Maeda
IPC分类号： G11B5/09 , G11B27/36
CPC分类号： G11B5/09 , B82Y10/00 , G11B5/59616 , G11B5/743 , G11B20/10009 , G11B20/10435 , G11B20/1879 , G11B2220/2516 , G11B2220/252
摘要： A hard-disk drive. The hard-disk drive includes a magnetic-recording disk including tracks on which a plurality of patterned bit-cells that are isolated magnetically are aligned at predetermined alignment pitches. The hard-disk drive includes a magnetic-recording head which is configured to follow tracks, and to write and to read data. The hard-disk drive includes a signal-processing unit which is configured to generate a recording signal based on a write-clock signal with cycles corresponding to alignment pitches of patterned bit-cells, and to output a recording signal. The hard-disk drive includes a phase-detecting unit which is configured to detect a phase of the write-clock signal when the magnetic-recording head reaches an end point of a predetermined range. The hard disk drive includes a determination-processing unit which is configured to determine success of data writing based on a difference between an expected value and a detected value of the phase of the write-clock signal.
摘要翻译：硬盘驱动器。硬盘驱动器包括磁记录盘，磁盘包括轨道，磁道上分离出多个图案化的位单元，以预定的对准间距排列。硬盘驱动器包括磁记录头，其被配置为跟随轨道，并且写入和读取数据。硬盘驱动器包括信号处理单元，其被配置为基于具有对应于图案化位单元的对准间距的周期的写时钟信号产生记录信号，并输出记录信号。硬盘驱动器包括相位检测单元，其被配置为当磁记录头达到预定范围的终点时检测写时钟信号的相位。硬盘驱动器包括确定处理单元，其被配置为基于期望值和写入时钟信号的相位的检测值之间的差来确定数据写入的成功。

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