公开(公告)号：US5117320A

公开(公告)日：1992-05-26

申请号：US592431

申请日：1990-10-04

申请人： Kenji Ogasawara ,  Koji Kurachi ,  Atsushi Tobari

发明人： Kenji Ogasawara ,  Koji Kurachi ,  Atsushi Tobari

IPC分类号： G11B5/02 ,  G11B5/09 ,  G11B5/245

CPC分类号： G11B5/2452 ,  G11B5/09

摘要： A magnetic head device comprising a magnetic core member made from a magnetic material having a positive magnetostriction constant and having confronting pole pieces separated by a non-magnetic material to form a transducing gap. A coil is wound around the magnetic core member so that a read signal can be read out from the coil, and a d.c. bias magnetic field is generated in the magnetic core member when a read signal is read out from the coil so that distortion of the read signal is suppressed.

公开(公告)号：US5905603A

公开(公告)日：1999-05-18

申请号：US510173

申请日：1995-08-02

申请人： Kenji Ogasawara ,  Hiroshi Yanagisawa ,  Koji Kurachi

发明人： Kenji Ogasawara ,  Hiroshi Yanagisawa ,  Koji Kurachi

IPC分类号： G11B21/10 ,  G11B5/55 ,  G11B5/596

CPC分类号： G11B5/59655 ,  G11B5/553 ,  G11B5/59688

摘要： A method and apparatus for accurately positioning the magnetic head of disk drives is disclosed. A recording medium is provided having two radial data structures formed thereon. Each radial data structure includes two parallel and adjacent data burst pattern trains. The first burst pattern is defined by a first side centrally aligned with a concentric data track and a second side opposed to the first side and centrally aligned with an adjacent concentric data track. The third burst pattern is defined by a third side spaced apart from the first side of the first burst pattern by a distance not greater than the read width of a magnetic head and a fourth side opposed to the third side and spaced apart from the second side by a distance not greater than the read width. The first radial data structure generates a first signal for positioning the magnetic head relative to the recording medium. The second radial data structure, parallel and offset from the first data structure, generates a second head position signal. Thus, the second head position signal is detected before the first head position signal becomes undetectable.

摘要翻译： 公开了一种用于精确定位磁盘驱动器的磁头的方法和装置。 提供具有形成在其上的两个径向数据结构的记录介质。 每个径向数据结构包括两个并行和相邻的数据突发模式列。 第一突发图案由与同心数据轨道集中对准的第一侧和与第一侧相对并且与相邻同心数据轨道居中对准的第二侧限定。 第三突发图案由与第一突发图案的第一侧间隔开的距离不大于磁头的读取宽度的第三侧和与第三侧相对并与第二侧相隔开的第四侧限定 距离不大于读宽度。 第一径向数据结构产生用于相对于记录介质定位磁头的第一信号。 与第一数据结构平行和偏移的第二径向数据结构产生第二头位置信号。 因此，在第一头部位置信号变得不可检测之前检测到第二头部位置信号。

公开(公告)号：US5815332A

公开(公告)日：1998-09-29

申请号：US623943

申请日：1996-03-29

申请人： Hiroaki Suzuki ,  Kenji Ogasawara ,  Masaharu Kawamura ,  Koji Kurachi

发明人： Hiroaki Suzuki ,  Kenji Ogasawara ,  Masaharu Kawamura ,  Koji Kurachi

IPC分类号： G11B5/55 ,  G11B5/596 ,  G11B20/12 ,  G11B21/08 ,  G11B21/10 ,  G11B5/09

CPC分类号： G11B5/553 ,  G11B21/083 ,  G11B21/106 ,  G11B5/59605

摘要： A mechanism for compensating the servo data in a disk storage drive is provided. On each recording surface of a disk, a plurality of servo regions are diametrally formed in data regions along the diametral direction of the disk. In the servo region, a gray code (cyclic binary code) representing the address of a data track is recorded so as to correspond to the data track, and a burst pattern as a signal for positioning the head on the track are recorded. In the data track region, tracks are formed at a predetermined pitch P and in the tracks, a plurality of data is recorded. ID (Identification) is the identification information of the individual data. A servo compensation signal region is formed at a position sandwiched by the data region and the servo region known as the write recovery area. This is to compensate the servo signal in the servo region, thereby to enable error recovery when a read error or the like occurs in the servo region.

摘要翻译： 提供了用于补偿磁盘存储驱动器中的伺服数据的机构。 在盘的每个记录表面上，沿着盘的径向方向的数据区域沿径向形成多个伺服区域。 在伺服区域中，记录表示数据磁道的地址的灰度代码（循环二进制码），以对应于数据磁道，并且记录作为将磁头定位在磁道上的信号的突发图形。 在数据轨道区域中，以预定间距P和轨迹形成轨道，记录多个数据。 ID（识别）是各个数据的识别信息。 伺服补偿信号区域形成在被数据区域和被称为写入恢复区域的伺服区域夹持的位置上。 这是为了补偿伺服区域中的伺服信号，从而当在伺服区域中发生读取错误等时能够进行错误恢复。

公开(公告)号：US5561566A

公开(公告)日：1996-10-01

申请号：US356427

申请日：1994-12-15

申请人： Yuji Kigami ,  Koji Kurachi ,  Takao Matsui ,  Takashi Nakamura ,  Tsutomu Numata ,  Kenji Ogasawara ,  Mayumi Okada ,  Yuji Yokoe

发明人： Yuji Kigami ,  Koji Kurachi ,  Takao Matsui ,  Takashi Nakamura ,  Tsutomu Numata ,  Kenji Ogasawara ,  Mayumi Okada ,  Yuji Yokoe

IPC分类号： G11B20/10 ,  G11B5/012 ,  G11B5/09 ,  G11B19/02 ,  G11B20/12 ,  G11B20/18 ,  G11B27/10

CPC分类号： G11B20/1883 ,  G11B19/02 ,  G11B20/1258 ,  G11B5/012 ,  G11B2020/10916 ,  G11B2020/1234 ,  G11B2020/1282 ,  G11B2220/20

摘要： A disk drive having embedded servo information accesses data without using sector identifier recorded in each sector. When a signal sector pulse signal (SP) at the end of a servo area is detected in a dead state during start up, a first data state for the start of a sector transits to a second data state for the litter region of the sector being divided in accordance with the capacity stored in a current sector's pointer register. At the beginning of the sector, the contents of a next sector's pointer register is stored in current sector's pointer register and the contents of a next sector's operation register is stored in a current sector's operation register. Upon completion of sector processing, the first data state is maintained when the next sector is contiguous. When a terminate instruction is stored in current sector's operation register, the process moves to dead state. When the servo area arrives, the process moves to idle state. Responsive to this state, the magnetic head is activated to enable read and write operation for sectors having no sector identifier on the disk.

摘要翻译： 具有嵌入式伺服信息的磁盘驱动器访问数据而不使用记录在每个扇区中的扇区标识符。 当在起动期间在死区中检测到伺服区域结束处的信号扇区脉冲信号（SP）时，用于扇区开始的扇区的第一数据状态转换到第二数据状态，用于扇区的凋落物区域为 根据存储在当前扇区的指针寄存器中的容量进行划分。 在扇区的开始处，下一个扇区的指针寄存器的内容存储在当前扇区的指针寄存器中，下一个扇区的操作寄存器的内容存储在当前扇区的操作寄存器中。 在扇区处理完成时，当下一扇区连续时，保持第一数据状态。 当终止指令存储在当前扇区的操作寄存器中时，进程进入死区。 当伺服区到达时，过程进入空闲状态。 响应于该状态，磁头被激活，以便能够对盘上没有扇区标识符的扇区进行读写操作。

公开(公告)号：US06490115B1

公开(公告)日：2002-12-03

申请号：US09218724

申请日：1998-12-22

申请人： Hiroaki Suzuki ,  Koji Kurachi ,  Katsumi Suda ,  Hideo Asano ,  Kenji Okada ,  Makoto Takase ,  Akira Kibashi ,  Hiromi Nishimiya ,  Takao Matsui ,  Tatsuya Endo ,  Kenji Kuroki

发明人： Hiroaki Suzuki ,  Koji Kurachi ,  Katsumi Suda ,  Hideo Asano ,  Kenji Okada ,  Makoto Takase ,  Akira Kibashi ,  Hiromi Nishimiya ,  Takao Matsui ,  Tatsuya Endo ,  Kenji Kuroki

IPC分类号： G11B2102

CPC分类号： G11B5/09 ,  G11B19/04

摘要： A method and apparatus for recovering from operation errors arising in an information recording and reproducing unit using a head with a GMR sensor is described. The read and write operations of the unit comprise executing a first error recovery procedure for recovering the operation error, executing a first GMR evaluation procedure for evaluating the performance of the GMR sensor when the operation error cannot be recovered by the first error recovery procedure, and applying a resetting pulse to the GMR sensor in accordance with the first GMR evaluation procedure.

摘要翻译： 描述了使用具有GMR传感器的头的信息记录和再现单元中出现的操作错误恢复的方法和装置。 该单元的读写操作包括执行用于恢复操作错误的第一错误恢复过程，当通过第一错误恢复过程无法恢复操作错误时，执行用于评估GMR传感器的性能的第一GMR评估过程，以及 根据第一GMR评估程序将复位脉冲施加到GMR传感器。

公开(公告)号：US5808822A

公开(公告)日：1998-09-15

申请号：US549378

申请日：1995-10-27

申请人： Koji Kurachi ,  Satoshi Hashimoto ,  Hiroshi Yanagisawa

发明人： Koji Kurachi ,  Satoshi Hashimoto ,  Hiroshi Yanagisawa

IPC分类号： G11B5/012 ,  G11B5/09 ,  G11B20/10 ,  G11B5/035

CPC分类号： G11B20/10009 ,  G11B5/012 ,  G11B5/09

摘要： In a disk drive system, a circuit reduces the deterioration of the S/N ratio and corrects the position of a peak in a read signal to an accurate position. In one embodiment, a circuit senses the threshold levels corresponding to the magnitudes of three consecutive peaks of a read signal. A comparator obtains the direction of shift of the centrally positioned peak with respect to a reference position from the relationship of the magnitudes of the three consecutive peaks. The comparator outputs a pulse representing the direction of shift to a FIFO buffer. A delay circuit outputs a plurality of pulses. The pulses are shifted by an amount corresponding to a threshold level. A multiplexer selects a pulse to output from the delay circuit based on the direction of shift that was output from the FIFO buffer and based on the difference detected by an amplitude detection circuit. In an alternative embodiment, the correction circuit is implemented using a microprocessor.

摘要翻译： 在磁盘驱动器系统中，电路减小了S / N比的劣化，并将读取信号中的峰值的位置校正到准确的位置。 在一个实施例中，电路感测对应于读取信号的三个连续峰值的幅度的阈值电平。 比较器根据三个连续峰值的大小的关系，获得相对于基准位置的中心位置的峰值的偏移方向。 比较器输出表示向FIFO缓冲器的移位方向的脉冲。 延迟电路输出多个脉冲。 脉冲移位相应于阈值电平的量。 多路复用器根据从FIFO缓冲器输出的移位方向，根据由振幅检测电路检测的差异，选择从延迟电路输出的脉冲。 在替代实施例中，校正电路使用微处理器来实现。