公开(公告)号：US08049986B2

公开(公告)日：2011-11-01

申请号：US12543845

申请日：2009-08-19

申请人： Kenya Ito ,  Takehiko Hamaguchi

发明人： Kenya Ito ,  Takehiko Hamaguchi

IPC分类号： G11B21/02 ,  G11B27/36 ,  G11B5/09

CPC分类号： G11B5/012 ,  B82Y10/00 ,  G11B5/1278 ,  G11B5/743 ,  G11B5/746 ,  G11B5/82 ,  G11B2005/0013

摘要： According to one embodiment, a control method for a magnetic disk device includes writing data by varying a phase of the array period of the plurality of magnetic elements or a phase of the time period of the recording signal in one section of the track from a corresponding phase in another section of the track, reading a reproduction signal from the track, and determining a phase shift between the array period of the plurality of magnetic elements and the time period of the recording signal, based on a reproduction signal read from the one section and a reproduction signal read from the other section. In another embodiment, a magnetic disk includes a track in which magnetic elements are magnetically separated and arranged in an array period, and a phase of the array period in one section is different from a phase in another section of the track.

摘要翻译： 根据一个实施例，一种用于磁盘装置的控制方法包括：通过改变多个磁性元件的阵列周期的相位或从轨道的一个部分中的记录信号的时间段的相位来写入数据 在轨道的另一部分中相位，从轨道读取再现信号，并且基于从一个部分读取的再现信号，确定多个磁性元件的阵列周期与记录信号的时间段之间的相移 以及从另一部分读取的再现信号。 在另一个实施例中，磁盘包括其中磁性元件以阵列周期被磁性地分离和布置的轨道，并且一个部分中的阵列周期的相位不同于轨道的另一部分中的相位。

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。

公开(公告)号：US20080192379A1

公开(公告)日：2008-08-14

申请号：US12011284

申请日：2008-01-24

申请人： Masayuki Kurita ,  Hideaki Tanaka ,  Noriaki Satoh ,  Toyomi Ohsawa ,  Toshiya Shiramatsu ,  Atsushi Yatagai ,  Satoshi Ohki ,  Hiroshi Ide ,  Hidekazu Kohira ,  Takehiko Hamaguchi

发明人： Masayuki Kurita ,  Hideaki Tanaka ,  Noriaki Satoh ,  Toyomi Ohsawa ,  Toshiya Shiramatsu ,  Atsushi Yatagai ,  Satoshi Ohki ,  Hiroshi Ide ,  Hidekazu Kohira ,  Takehiko Hamaguchi

IPC分类号： G11B5/48 ,  G11B5/56 ,  G11B5/60 ,  G11B21/21 ,  G01R31/01

CPC分类号： G11B5/455 ,  G11B5/3133 ,  G11B5/6029 ,  G11B5/607 ,  G11B5/6076 ,  Y10T29/49004

摘要： Embodiments of the present invention provide a process that monitors a magnetic playback signal while gradually increasing an electricity supply amount for a heater to thereby determine contact between a magnetic head slider and a magnetic disk medium. According to one embodiment, after components for configuring a magnetic recording/playback portion are assembled into a housing, magnetic information is played back on a specific track of a magnetic disk medium by using a playback element while gradually increasing an electricity supply amount for a heater of a magnetic head slider. An amplitude of a playback signal is measured at a plurality of portions along a circumferential direction of the track. Contact between the magnetic head slider and the magnetic disk medium is detected in accordance with an increase in variation in the measured amplitude. Then, a value obtained by subtracting an predetermined value of an electricity amount from an electricity amount in the event of detection of the contact is stored (set) as an appropriate electricity amount for the magnetic head slider into a storage portion.

摘要翻译： 本发明的实施例提供了一种监视磁回放信号的过程，同时逐渐增加用于加热器的电力供应量，从而确定磁头滑块和磁盘介质之间的接触。 根据一个实施例，在用于配置磁记录/重放部分的组件被组装到外壳中之后，通过使用回放元件在磁盘介质的特定轨道上回放磁信息，同时逐渐增加加热器的供电量 的磁头滑块。 沿着轨道的圆周方向的多个部分测量重放信号的幅度。 根据测量幅度的变化的增加来检测磁头滑块和磁盘介质之间的接触。 然后，通过从检测到接触的电量的电量中减去电量的预定值而获得的值作为用于磁头滑块的适当电量被存储（设置）到存储部分中。

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。

公开(公告)号：US20070247741A1

公开(公告)日：2007-10-25

申请号：US11788490

申请日：2007-04-20

申请人： Kyo Akagi ,  Takehiko Hamaguchi ,  Atsushi Takeichi

发明人： Kyo Akagi ,  Takehiko Hamaguchi ,  Atsushi Takeichi

IPC分类号： G11B21/02 ,  G11B5/596

CPC分类号： G11B5/59655 ,  G11B5/024

摘要： In an embodiment of the present invention, with Self Servo Write (SSW), a head slider is used to perform AC erase to a recording surface of a magnetic disk. The AC erase is performed asynchronously to every track. A frequency for use with AC erase, i.e., a frequency of an AC erase pattern is three times or higher than a burst frequency of a product servo pattern or a burst frequency of a radial pattern. By satisfying such requirements, for the magnetic disk of vertical magnetic recording, it becomes possible to substantially stop adversely affecting pattern reading in an AC erase area.

摘要翻译： 在本发明的一个实施例中，使用自动伺服写入（SSW），磁头滑动器用于对磁盘的记录表面执行AC擦除。 AC擦除与每个轨道异步执行。 用于AC擦除的频率，即AC擦除模式的频率是产品伺服模式的突发频率或径向图案的突发频率的三倍或更高。 通过满足这种要求，对于垂直磁记录磁盘，可以基本上停止对交流擦除区域中的图形读取的不利影响。

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.

公开(公告)号：US20050036226A1

公开(公告)日：2005-02-17

申请号：US10944845

申请日：2004-09-21

申请人： Takehiko Hamaguchi ,  Kyo Akagi ,  Hisashi Takano ,  Takayuki Ichihara

发明人： Takehiko Hamaguchi ,  Kyo Akagi ,  Hisashi Takano ,  Takayuki Ichihara

IPC分类号： G11B5/012 ,  G11B5/55 ,  G11B5/596 ,  G11B20/10 ,  G11B20/12 ,  G11B21/10 ,  G11B27/30 ,  G11B19/04 ,  G11B21/02 ,  G11B27/36

CPC分类号： G11B20/1252 ,  G11B5/012 ,  G11B5/5582 ,  G11B5/59611 ,  G11B5/59655 ,  G11B5/59694 ,  G11B20/10 ,  G11B27/3027 ,  G11B2020/1232 ,  G11B2020/1238 ,  G11B2020/1267 ,  G11B2020/1287 ,  G11B2220/20 ,  G11B2220/2516

摘要： A hard disk drive and magnetic medium including a servo area, a data area divided into a plurality of sector blocks and at least one micro-servo area disposed between two sector blocks. There may be a micro-servo area immediately preceding each of the plurality of sector blocks. The micro-servo areas include an address mark and a track parity check code that allow the detection of an external shock that causes the recording (write) head to skip to an adjacent track in the hard disk medium. The micro-servo area is smaller than the servo areas, and various numbers of different track parity check codes can be used for different resolution of shock detection. An acceleration sensor may also be provided to detect larger external shocks. By detecting various external shocks with improved accuracy, and aborting the recording operation of data if an external shock is detected, the corruption of data in adjacent tracks is substantially reduced to improve disk drive performance.

摘要翻译： 一种硬盘驱动器和磁介质，包括伺服区域，分成多个扇区块的数据区域和设置在两个扇区块之间的至少一个微伺服区域。 可能存在紧邻在多个扇区块中的每一个之前的微伺服区域。 微伺服区域包括地址标记和轨道奇偶校验码，其允许检测导致记录（写入）头跳到硬盘介质中的相邻轨道的外部冲击。 微伺服区域小于伺服区域，各种数量的不同轨道奇偶校验码可用于不同的震动检测分辨率。 还可以提供加速度传感器来检测更大的外部冲击。 通过以更高的精度检测各种外部冲击，并且如果检测到外部冲击则中止数据的记录操作，则相当的磁道中的数据的损坏被大大减少以提高磁盘驱动器的性能。

公开(公告)号：US06760172B1

公开(公告)日：2004-07-06

申请号：US09616073

申请日：2000-07-13

申请人： Takehiko Hamaguchi ,  Hideki Zaitsu ,  Futoshi Tomiyama

发明人： Takehiko Hamaguchi ,  Hideki Zaitsu ,  Futoshi Tomiyama

IPC分类号： G11B509

CPC分类号： G11B5/59633

摘要： To improve the track density by reducing the discontinuity of servo patterns to be generated by a servo track writer, some servo areas existing in one circuit of a magnetic disk are formed at the consecutive first and second circuits of a servo track writer by averaging a plurality of position signals detected from servo patterns at the first and second circuits of the magnetic disk.

摘要翻译： 为了通过减少由伺服轨迹写入器产生的伺服模式的不连续性来提高轨道密度，存在于磁盘的一个电路中的一些伺服区域通过对伺服轨迹写入器的连续的第一和第二电路进行平均而形成， 在磁盘的第一和第二电路处从伺服模式检测的位置信号。

公开(公告)号：US06717760B2

公开(公告)日：2004-04-06

申请号：US10102651

申请日：2002-03-22

申请人： Takehiko Hamaguchi ,  Futoshi Tomiyama ,  Hideki Zaitsu ,  Hisashi Takano

发明人： Takehiko Hamaguchi ,  Futoshi Tomiyama ,  Hideki Zaitsu ,  Hisashi Takano

IPC分类号： G11B2736

CPC分类号： B82Y10/00 ,  B82Y25/00 ,  G11B5/012 ,  G11B5/3909 ,  G11B5/5552 ,  G11B5/59611 ,  G11B2005/001 ,  G11B2005/0016

摘要： A plurality of patterns are formed beforehand so that each of those patterns is deviated slightly from another in each sector in the track width direction, then the pattern is followed up, thereby obtaining both full-track profile and micro-track profile. A variation of a position signal is detected from this profile, thereby creating a table for correcting the non-linearity error of the position signal. Consequently, the distribution of the write/read-back property is measured, thereby enabling the track density to be improved. Furthermore, a variation of the position signal caused by a property variation of the head read-back element is detected and corrected, thereby enabling a high reliability and a high track density to be realized for the object magnetic recording disk apparatus.

摘要翻译： 预先形成多个图案，使得这些图案中的每一个在轨道宽度方向上在每个扇区中与另一个图案稍微偏离，然后跟踪图案，从而获得全轨道轮廓和微轨道轮廓。 从该轮廓检测位置信号的变化，从而创建用于校正位置信号的非线性误差的表格。因此，测量写入/读回属性的分布，从而使轨道密度为 改进。 此外，检测和校正由头读回元件的特性变化引起的位置信号的变化，从而能够实现对象磁记录盘装置的高可靠性和高轨道密度。

公开(公告)号：US6130797A

公开(公告)日：2000-10-10

申请号：US913835

申请日：1997-09-16

申请人： Kyo Akagi ,  Yoshihiro Shiroishi ,  Reijiro Tsuchiya ,  Takehiko Hamaguchi ,  Masuo Umemoto ,  Mikio Suzuki ,  Takashi Kawabe ,  Katsuro Watanabe ,  Kiyoshi Matsumoto ,  Atsushi Saito ,  Kouichirou Wakabayashi ,  Yosuke Hamada

发明人： Kyo Akagi ,  Yoshihiro Shiroishi ,  Reijiro Tsuchiya ,  Takehiko Hamaguchi ,  Masuo Umemoto ,  Mikio Suzuki ,  Takashi Kawabe ,  Katsuro Watanabe ,  Kiyoshi Matsumoto ,  Atsushi Saito ,  Kouichirou Wakabayashi ,  Yosuke Hamada

IPC分类号： G11B5/596 ,  G11B7/095 ,  G11B11/105

CPC分类号： G11B5/59655 ,  G11B11/10576 ,  G11B5/59627 ,  G11B11/10578 ,  G11B7/0953

摘要： Virtual tracks are set so that the rotation center of a magnetic recording medium or the vicinity of the rotation center coincides with the track center of the data information, and positioning servo control is performed. Thus, since it is not necessary to faithfully follow the track center line specified by the servo information that is previously recorded on the magnetic recording medium or magnetooptical recording medium, a vibration is not easily caused in synchronism with the rotation. Therefore, when the rotation center and the pattern center are deviated from each other, since a vibration is not caused in synchronism with the rotation, the magnetic head of the magnetic recorder or the magnetooptical head of the magnetooptical recorder is able to follow tracks with higher precision. Accordingly, the recording density can be increased.

摘要翻译： PCT No.PCT / JP95 / 00474 Sec。 371日期1997年9月17日 102（e）1997年9月17日PCT 1995年3月17日PCT公布。 公开号WO96 / 29700 日期1996年9月26日设置虚拟磁道，使得磁记录介质的旋转中心或旋转中心附近与数据信息的轨道中心一致，并执行定位伺服控制。 因此，由于不需要忠实地跟踪由先前记录在磁记录介质或磁光记录介质上的伺服信息指定的轨道中心线，因此不易与旋转同步地产生振动。 因此，当旋转中心和图案中心彼此偏离时，由于不会与旋转同步地产生振动，磁记录器的磁头或磁光记录器的磁光头能够跟随具有更高的轨迹 精确。 因此，可以提高记录密度。