公开(公告)号：US07545595B2

公开(公告)日：2009-06-09

申请号：US11354912

申请日：2006-02-16

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： A magnetic disk apparatus including: a disk holding data as magnetic information on a magnetic recording film; a head to perform writing and reading of the magnetic information; a rotary actuator to move the head in a radial direction of the disk; plural heat elements in the head to locally heat the disk; a write element in the head to apply a magnetic field to the disk; and means for selecting at least one heat element from the plural heat elements, wherein the means for selecting the heat element selects at least one heat element from the plural heat elements so as to bring a center line of an area heated by the heat element and a center line of the position of the magnetic field generated by the write element into approximate correspondence, in correspondence with a relative angle between the head and a direction of movement of the disk.

摘要翻译： 一种磁盘装置，包括：磁盘，其将数据作为磁性信息保存在磁记录膜上; 执行写入和读取磁信息的头部; 旋转致动器，用于沿着盘的径向方向移动头部; 头部中的多个热元件以局部加热盘; 磁头中的一个写元件将磁场施加到磁盘上; 以及用于从所述多个加热元件中选择至少一个加热元件的装置，其中用于选择所述加热元件的装置从所述多个加热元件中选择至少一个加热元件，以使得由所述加热元件加热的区域的中心线，以及 由写入元件产生的磁场的位置的中心线对应于磁头与磁盘的移动方向之间的相对角度相对应。

公开(公告)号：US20090021854A1

公开(公告)日：2009-01-22

申请号：US12230989

申请日：2008-09-09

申请人： Yasutaka Nishida ,  Takehiko Hamaguchi ,  Hideki Sawaguchi ,  Hisashi Takano

发明人： Yasutaka Nishida ,  Takehiko Hamaguchi ,  Hideki Sawaguchi ,  Hisashi Takano

IPC分类号： G11B5/09

CPC分类号： G11B5/59655 ,  G11B5/59688

摘要： In a method of servo writing of a magnetic recording system and the magnetic recording system, the signal is recorded in a dummy area with a higher recording density than the burst signal. Also, the maximum bit length of the burst area is shortened as compared with the maximum bit length of the data area. A servo control method for perpendicular recording similar to that for longitudinal recording can be used to reduce the development cost. The anti-signal decay performance is also improved. Further, since the variations of the burst signal along the track width is suppressed, the positioning accuracy is improved. These effects combine to produce a reliable magnetic recording system of large capacity.

公开(公告)号：US06327112B1

公开(公告)日：2001-12-04

申请号：US09227078

申请日：1999-01-05

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

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

IPC分类号： G11B5596

CPC分类号： G11B19/04 ,  G11B5/596

摘要： An information storage apparatus has a disk medium setting data recording areas along a plurality of tracks concentrically arranged, a head for recording and reproducing data on tracks of the disk medium, an actuator for moving the head to a desired track among the plurality of tracks. Also included is an electric circuit for controlling recording and reproducing in response to detecting the distance from a recorded magnetization pattern on an adjacent track in the radial direction by detecting previously recorded signals on adjacent tracks while data recording. Even if the track density is increased, the upper limit of a threshold value of a function for preventing off-track recording of the information storage apparatus can be increased and a high track density of the information storage apparatus can be easily realized.

摘要翻译： 信息存储装置具有盘介质，沿着同心配置的多个轨道设置数据记录区域，用于在盘介质的轨道上记录和再现数据的磁头，用于将磁头移动到多个磁道中的期望磁道的致动器。 还包括用于响应于通过在数据记录期间检测相邻轨道上的先前记录的信号来检测与径向上的相邻轨道上的记录磁化模式的距离来控制记录和再现的电路。 即使磁道密度增加，也可以增加用于防止信息存储装置的越野记录的功能的阈值的上限，并且可以容易地实现信息存储装置的高磁道密度。

公开(公告)号：US07443625B2

公开(公告)日：2008-10-28

申请号：US11404780

申请日：2006-04-17

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

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

IPC分类号： G11B5/02

CPC分类号： G11B5/012 ,  G11B5/4886 ,  G11B27/02

摘要： In the present invention, by making the width of the write element larger than the track pitch and securing a write magnetic field strong enough to reverse the magnetization of the magnetic layer, and further by writing while shifting a write head comprising the write element, a magnetic disk drive, of which the track width is narrower than the write element width, and the storage capacity is large, is realized.

摘要翻译： 在本发明中，通过使写入元件的宽度大于轨道间距，并且确保写入磁场足够强以反转磁性层的磁化，并且进一步通过在包括写入元件的写入头的移位的同时进行写入， 磁盘驱动器，其轨道宽度比写入元件宽度窄，并且存储容量大。

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：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：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.

公开(公告)号：US20060187578A1

公开(公告)日：2006-08-24

申请号：US11404780

申请日：2006-04-17

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

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

IPC分类号： G11B17/00

CPC分类号： G11B5/012 ,  G11B5/4886 ,  G11B27/02

摘要： For the purpose of letting through a magnetic flux which reverses the magnetization of the magnetic layer of the magnetic disk, a write element requires a predetermined sectional area. However, if a cross section of a magnetic pole is structured as the one having a large aspect ratio, the pole becomes less capable of letting the magnetic flux through effectively. This phenomenon brings about a lower limit on the track width of the magnetic poles and the track density cannot be raised. In the present invention, by making the width of the write element larger than the track pitch and securing a write magnetic field strong enough to reverse the magnetization of the magnetic layer, and further by writing while shifting a write head comprising the write element, a magnetic disk drive, of which the track width is narrower than the write element width, and the storage capacity is large, is realized.

公开(公告)号：US06310741B1

公开(公告)日：2001-10-30

申请号：US09225972

申请日：1999-01-05

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： G11B509

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.

摘要翻译： 当磁头的位置误差PE的数量满足Ewf> PE> = Eww的两个阈值Ewf和Eww满足Ewf> Eww的条件时，轨道被记录在轨道信息表中作为需要重写的轨道，并且轨道 在与轨道相邻的两侧临时禁止写入。 轨道的数据稍后被重写在另一个轨道上，以便保持数据。这样做，可以使得记录轨道的远距离更小，而不牺牲访问速度，并且可以减少写入故障的发生概率。 此外，可以提高磁盘装置的可靠性。

公开(公告)号：US07839590B2

公开(公告)日：2010-11-23

申请号：US12230989

申请日：2008-09-09

申请人： Yasutaka Nishida ,  Takehiko Hamaguchi ,  Hideki Sawaguchi ,  Hisashi Takano

发明人： Yasutaka Nishida ,  Takehiko Hamaguchi ,  Hideki Sawaguchi ,  Hisashi Takano

IPC分类号： G11B5/09 ,  G11B5/596

CPC分类号： G11B5/59655 ,  G11B5/59688

摘要： In a method of servo writing of a magnetic recording system and the magnetic recording system, the signal is recorded in a dummy area with a higher recording density than the burst signal. Also, the maximum bit length of the burst area is shortened as compared with the maximum bit length of the data area. A servo control method for perpendicular recording similar to that for longitudinal recording can be used to reduce the development cost. The anti-signal decay performance is also improved. Further, since the variations of the burst signal along the track width is suppressed, the positioning accuracy is improved. These effects combine to produce a reliable magnetic recording system of large capacity.

摘要翻译： 在磁记录系统和磁记录系统的伺服写入的方法中，该信号被记录在具有比突发信号更高的记录密度的虚拟区域中。 此外，与数据区域的最大位长度相比，突发区域的最大位长度被缩短。 可以使用与纵向记录类似的垂直记录的伺服控制方法来降低开发成本。 反信号衰减性能也得到提高。 此外，由于抑制了沿着磁道宽度的突发信号的变化，因此提高了定位精度。 这些效应相结合，产生了可靠的大容量磁记录系统。