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：US07221530B2

公开(公告)日：2007-05-22

申请号：US11245168

申请日：2005-10-07

申请人： Futoshi Tomiyama ,  Takehiko Hamaguchi ,  Miki Hara ,  Fumiko Akagi ,  Yasutaka Nishida

发明人： Futoshi Tomiyama ,  Takehiko Hamaguchi ,  Miki Hara ,  Fumiko Akagi ,  Yasutaka Nishida

IPC分类号： G11B5/02

CPC分类号： G11B5/1278 ,  G11B5/012 ,  G11B5/02 ,  G11B5/3116 ,  G11B5/313 ,  G11B5/4886

摘要： There are provided a magnetic head and a magnetic disk apparatus wherein an upper magnetic pole is so shaped that, at a position where skew angle is maximum, the maximum of its projected length in the radial direction of a magnetic disk is not more than the track pitch of the magnetic disk, whereby acceleration of thermal relaxation of information recorded on adjacent tracks is obviated even in an area where the skew angle is large.

摘要翻译： 提供了一种磁头和磁盘装置，其中上磁极的形状使得在歪斜角最大的位置处，其磁盘的径向上的突出长度的最大值不大于磁道 即使在歪斜角较大的区域中也能消除记录在相邻轨道上的信息的热松弛的加速度。

公开(公告)号：US20060262453A1

公开(公告)日：2006-11-23

申请号：US11436382

申请日：2006-05-17

申请人： Masafumi Mochizuki ,  Yasutaka Nishida ,  Takehiko Hamaguchi ,  Kimitoshi Etoh

发明人： Masafumi Mochizuki ,  Yasutaka Nishida ,  Takehiko Hamaguchi ,  Kimitoshi Etoh

IPC分类号： G11B5/127

CPC分类号： G11B5/3116 ,  G11B5/1278 ,  G11B5/1871 ,  G11B5/313 ,  G11B5/3163

摘要： Embodiments of the invention provide a magnetic head which can suppress broadening of the magnetic field distribution in the track-width direction without reducing the magnetic field intensity. In one embodiment, a main pole is composed of a pole tip having a part providing a write-track width, and a yoke part recessed from the air bearing surface in the element-height direction, where the trailing side surface of the pole tip is made as an asymmetric structure with respect to the track center.

摘要翻译： 本发明的实施例提供一种可以抑制磁道宽度方向的磁场分布的扩大而不降低磁场强度的磁头。 在一个实施例中，主极由具有提供写入轨道宽度的部分的极尖和从元件高度方向上的空气轴承表面凹陷的磁极部分组成，其中极尖的后侧表面为 作为相对于轨道中心的不对称结构。

公开(公告)号：US07092181B2

公开(公告)日：2006-08-15

申请号：US11196385

申请日：2005-08-04

申请人： Yasutaka Nishida ,  Takehiko Hamaguchi ,  Hideki Sawaguchi

发明人： Yasutaka Nishida ,  Takehiko Hamaguchi ,  Hideki Sawaguchi

IPC分类号： G11B5/09

CPC分类号： G11B20/10046 ,  G11B5/012 ,  G11B5/09 ,  G11B5/59633 ,  G11B20/10009 ,  G11B20/10481 ,  G11B27/3027 ,  G11B2005/0029 ,  G11B2220/20

摘要： A method of enhancing the thermal stability of gray codes is disclosed. The gray code block in a servo area is recorded with a combination of two different magnetization directions. When the two different magnetization directions are expressed as “+” and “−”, the information “1” is recorded as “++−−” or “−−++” with the information “0” recorded as “+−+−” or “−+−+”. Since the filter for gray code demodulation is provided with a perpendicular recording mode, the servo area does not use long-wavelength signals that are susceptible to thermal demagnetization. As a result, thermal stability is enhanced.

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：US07027248B2

公开(公告)日：2006-04-11

申请号：US10633621

申请日：2003-08-05

申请人： Takehiko Hamaguchi ,  Atsushi Nakamura ,  Yasutaka Nishida ,  Masafumi Mochizuki ,  Hideki Sawaguchi

发明人： Takehiko Hamaguchi ,  Atsushi Nakamura ,  Yasutaka Nishida ,  Masafumi Mochizuki ,  Hideki Sawaguchi

IPC分类号： G11B5/02

CPC分类号： G11B5/6005 ,  G11B5/012 ,  G11B5/105 ,  G11B5/127 ,  G11B5/1272 ,  G11B5/2654 ,  G11B5/4886 ,  G11B5/56 ,  G11B2005/001 ,  G11B2005/0021

摘要： In a thermal assisted type magnetic disk apparatus having a head holding a heat element and a write element, in which coercivity of a disk is locally reduced by temperature-increasing the disk and writing is performed by the write element, along with a seek operation to move the head by a rotary actuator in a radial direction, a yaw angle is changed and a heat area and the write element are track-shifted. A mechanism to offset one of the heat area and the write element in a width direction of a slider, to array the heat element and the write element in a track running direction in correspondence with the yaw angle of the head.

摘要翻译： 在具有保持加热元件的头部和写入元件的热辅助型磁盘装置中，通过写入元件，通过写入元件执行盘的矫顽力局部减小并且进行寻道操作 通过旋转致动器在径向方向上移动头部，改变偏航角，并且对热区域和写入元件进行轨道移动。 一种抵消滑块的宽度方向上的加热区域和写入元件中的一个的机构，用于使加热元件和写入元件沿与磁头的偏航角相对应的磁道行进方向排列。

公开(公告)号：US20060028752A1

公开(公告)日：2006-02-09

申请号：US11245168

申请日：2005-10-07

申请人： Futoshi Tomiyama ,  Takehiko Hamaguchi ,  Miki Hara ,  Fumiko Akagi ,  Yasutaka Nishida

发明人： Futoshi Tomiyama ,  Takehiko Hamaguchi ,  Miki Hara ,  Fumiko Akagi ,  Yasutaka Nishida

IPC分类号： G11B19/04 ,  G11B5/147

CPC分类号： G11B5/1278 ,  G11B5/012 ,  G11B5/02 ,  G11B5/3116 ,  G11B5/313 ,  G11B5/4886

摘要： There are provided a magnetic head and a magnetic disk apparatus wherein an upper magnetic pole is so shaped that, at a position where skew angle is maximum, the maximum of its projected length in the radial direction of a magnetic disk is not more than the track pitch of the magnetic disk, whereby acceleration of thermal relaxation of information recorded on adjacent tracks is obviated even in an area where the skew angle is large.

摘要翻译： 提供了一种磁头和磁盘装置，其中上磁极的形状使得在歪斜角最大的位置处，其磁盘的径向上的突出长度的最大值不大于磁道 即使在歪斜角较大的区域中也能消除记录在相邻轨道上的信息的热松弛的加速度。

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：US06657805B2

公开(公告)日：2003-12-02

申请号：US09944205

申请日：2001-09-04

申请人： Yasutaka Nishida ,  Takehiko Hamaguchi ,  Hisashi Takano ,  Hiroshi Ide ,  Hideki Sawaguchi ,  Futoshi Tomiyama

发明人： Yasutaka Nishida ,  Takehiko Hamaguchi ,  Hisashi Takano ,  Hiroshi Ide ,  Hideki Sawaguchi ,  Futoshi Tomiyama

IPC分类号： G11B1504

CPC分类号： G11B19/04 ,  G11B5/596

摘要： When the amount of position error PE of a magnetic head meets the condition of Ewf>PE>=Eww for two threshold values Ewf and Eww meeting Ewf>Eww, the track is registered in the track information table as a track requiring rewrite and the tracks on both sides neighboring to the track are temporarily write-inhibited. The data of the track is rewritten on another track later so as to maintain the data. By doing this, the offtrack of the recording track can be made smaller without sacrifice of the access speed and the occurrence probability of write fault can be reduced. Furthermore, the reliability of a magnetic disk apparatus can be improved.