公开(公告)号：US20120162813A1

公开(公告)日：2012-06-28

申请号：US13290459

申请日：2011-11-07

申请人： Toshitaka MATSUNAGA ,  Hideo SADO ,  Koichi AIKAWA ,  Tetsuya TABUCHI

发明人： Toshitaka MATSUNAGA ,  Hideo SADO ,  Koichi AIKAWA ,  Tetsuya TABUCHI

IPC分类号： G11B21/02

CPC分类号： G11B5/596 ,  G11B5/4873 ,  G11B5/5552

摘要： According to one embodiment, a magnetic disk drive includes a disk, a first microactuator, a second microactuator and a servo controller. The disk comprises a first surface and a second surface. The first and second microactuators allow first and second heads associated with the first and second surfaces to make micromotion based on first and second operation amounts, respectively. The servo controller provides a third operation amount to the first microactuator as the first operation amount and provides an operation amount obtained by inverting a polarity of a frequency component with a particular frequency contained in the third operation amount, to the second microactuator as the second operation amount, if the third operation amount is generated as an operation amount to be provided to the first microactuator in a particular mode in which the first surface is used as a tracking surface.

摘要翻译： 根据一个实施例，磁盘驱动器包括盘，第一微致动器，第二微致动器和伺服控制器。 盘包括第一表面和第二表面。 第一和第二微致动器允许分别基于第一和第二操作量分别与第一和第二表面相关联的第一和第二头部进行微动作。 伺服控制器向第一微型致动器提供第三操作量作为第一操作量，并且通过将具有第三操作量中包含的特定频率的频率分量的极性反转而获得的操作量作为第二操作提供给第二微型致动器 如果第三操作量被产生作为将第一表面用作跟踪表面的特定模式中提供给第一微致动器的操作量。

公开(公告)号：US20090168218A1

公开(公告)日：2009-07-02

申请号：US12248827

申请日：2008-10-09

申请人： Seiji MIZUKOSHI ,  Hideo SADO ,  Toshitaka MATSUNAGA ,  Shouji NAKAJIMA

发明人： Seiji MIZUKOSHI ,  Hideo SADO ,  Toshitaka MATSUNAGA ,  Shouji NAKAJIMA

IPC分类号： G11B5/09

CPC分类号： G11B5/59633 ,  G11B5/59661 ,  G11B5/59666

摘要： According to one embodiment, a servo write module is configured to write radial servo patterns on the disk media using a first spiral servo pattern of the spiral servo patterns as a base pattern for tracing, to detect a shift amount of a sync mark position in each of other spiral servo patterns with respect to a sync mark position in the first spiral servo pattern, and to adjust, when the base pattern is switched from the first spiral servo pattern to a second spiral servo pattern of the spiral servo patterns, a phase of the servo write clock based on the detected shift amount corresponding to the second spiral servo pattern.

摘要翻译： 根据一个实施例，伺服写入模块被配置为使用螺旋伺服模式的第一螺旋伺服模式作为跟踪的基本模式在盘介质上写入径向伺服模式，以检测每个中的同步标记位置的移位量 相对于第一螺旋伺服模式中的同步标记位置的其他螺旋伺服模式，并且当基本模式从第一螺旋伺服模式切换到螺旋伺服模式的第二螺旋伺服模式时，调整相位 基于对应于第二螺旋伺服模式的检测到的移位量的伺服写入时钟。

公开(公告)号：US20090168225A1

公开(公告)日：2009-07-02

申请号：US12244662

申请日：2008-10-02

申请人： Toshitaka MATSUNAGA ,  Hideo SADO ,  Seiji MIZUKOSHI ,  Shouji NAKAJIMA ,  Katsuki UEDA ,  Shinichirou KOUHARA

发明人： Toshitaka MATSUNAGA ,  Hideo SADO ,  Seiji MIZUKOSHI ,  Shouji NAKAJIMA ,  Katsuki UEDA ,  Shinichirou KOUHARA

IPC分类号： G11B5/596 ,  G11B5/58

CPC分类号： G11B5/5547 ,  G11B5/596

摘要： According to one embodiment, a disk drive includes a detection signal producing module configured to produce a detection signal by reading each of the spiral servo patterns, the spiral servo patterns being read by a head while the head scans a circumferential direction region on the disk media. A position error computation module is configured to produce servo burst signals A, B, C, and D using a plurality of frames obtained by dividing the detection signal at even time intervals, at least one burst signal of the servo burst signals being produced using at least two frames in the frames, and to compute a position error of the head based on amplitude values of the produced burst signals.

摘要翻译： 根据一个实施例，磁盘驱动器包括检测信号产生模块，该检测信号产生模块被配置为通过读取螺旋伺服模式中的每一个来产生检测信号，当磁头扫描磁盘介质上的圆周方向区域时，由磁头读取的螺旋伺服模式 。 位置误差计算模块被配置为使用通过以均匀时间间隔分割检测信号而获得的多个帧来产生伺服脉冲串信号A，B，C和D，使用以下方式产生伺服脉冲信号的至少一个脉冲串信号： 帧中的至少两帧，并且基于所产生的突发信号的幅度值来计算头的位置误差。

公开(公告)号：US20100321810A1

公开(公告)日：2010-12-23

申请号：US12704033

申请日：2010-02-11

申请人： Katsuki UEDA ,  Hideo SADO ,  Takahisa HAGIWARA

发明人： Katsuki UEDA ,  Hideo SADO ,  Takahisa HAGIWARA

IPC分类号： G11B27/36

CPC分类号： G11B21/12

摘要： According to one embodiment, a search module searches for a timing when a moving direction of a head changes in order to detect a first timing when the head collides against a stopper of a ramp during a head unload operation and a second timing when the head rebounds as a result of the collision. A calculation module calculates a rebound distance that the head has rebounded based on the first timing and the second timing.

摘要翻译： 根据一个实施例，当头部移动方向改变时，搜索模块搜索头部变化时的定时，以便在头部卸载操作期间当头部与斜坡的止动件碰撞时检测第一定时，以及当头部反弹时的第二定时 作为碰撞的结果。 计算模块基于第一定时和第二定时计算头部已经反弹的回弹距离。