公开(公告)号：US5754355A

公开(公告)日：1998-05-19

申请号：US633596

申请日：1996-04-17

申请人： Takashi Nakamura ,  Isao Yoneda ,  Yuji Yokoe ,  Kazushi Tsuwako ,  Fujio Harako ,  Katsumi Suda ,  Michio Nakajima ,  Kenji Ogasawara

发明人： Takashi Nakamura ,  Isao Yoneda ,  Yuji Yokoe ,  Kazushi Tsuwako ,  Fujio Harako ,  Katsumi Suda ,  Michio Nakajima ,  Kenji Ogasawara

IPC分类号： G11B5/00 ,  G11B5/60 ,  G11B19/04 ,  G11B19/20 ,  G11B23/50 ,  G11B15/46

CPC分类号： G11B5/6005 ,  G11B19/04 ,  G11B19/20 ,  G11B23/505 ,  G11B2005/0016

摘要： A disk drive apparatus and read error recovery method in a disk drive apparatus removes thermal asperities on disk surfaces. A projection, such as a thermal asperity, on the recording surfaces of disks is detected when a signal transducer head contacts the projection. The flying height of the signal transducer head is lowered, e.g., by changing the disk rotation speed from the normal rotation speed in read/write operations or by heating a suspension having a bimetal element, while the signal transducer head is positioned over the detected projection on the track. The signal transducer head strikes the projection to break the projection. This avoids a subsequent error from being caused by the thermal asperity.

摘要翻译： 磁盘驱动装置中的磁盘驱动装置和读取错误恢复方法去除磁盘表面上的热凹凸。 当信号传感器头接触投影时，检测到盘的记录表面上的诸如热不均匀性的投影。 信号传感器头的飞行高度例如通过在读/写操作中通过将盘旋转速度从正常旋转速度改变或通过加热具有双金属元件的悬架而降低，同时信号传感器头位于检测到的投影上方 在轨道上。 信号传感器头撞击突起以断开突起。 这避免了由于热不平坦造成的后续错误。

公开(公告)号：US5696643A

公开(公告)日：1997-12-09

申请号：US632787

申请日：1996-04-17

申请人： Kazushi Tsuwako ,  Fujio Harako ,  Katsumi Suda ,  Michio Nakajima ,  Isao Yoneda ,  Kenji Ogasawara

发明人： Kazushi Tsuwako ,  Fujio Harako ,  Katsumi Suda ,  Michio Nakajima ,  Isao Yoneda ,  Kenji Ogasawara

IPC分类号： G11B5/60 ,  G11B19/04 ,  G11B19/20 ,  G11B23/50 ,  G11B15/46

CPC分类号： G11B5/6005 ,  G11B19/04 ,  G11B19/20 ,  G11B23/505

摘要： A disk drive apparatus and read error recovery method in a disk drive apparatus removes thermal asperities on disk surfaces. A projection, such as a thermal asperity, on the recording surfaces of disks is detected when a signal transducer contacts the projection. The flying height of the signal transducer is lowered, e.g., by reducing the disk rotation speed from the normal rotation speed in read/write operations, while the signal transducer is positioned over the detected projection on the track. The signal transducer strikes the projection to break the projection. This avoids a subsequent error from being caused by the thermal asperity.

摘要翻译： 磁盘驱动装置中的磁盘驱动装置和读取错误恢复方法去除磁盘表面上的热凹凸。 当信号传感器接触投影时，检测在盘的记录表面上的诸如热不均匀性的投影。 信号传感器的飞行高度例如通过在读/写操作中将盘旋转速度从正常旋转速度减小而信号换能器位于轨道上检测到的投影上方。 信号传感器撞击投影以断开投影。 这避免了由热不均匀引起的后续错误。

公开(公告)号：US06236527B1

公开(公告)日：2001-05-22

申请号：US09103758

申请日：1998-06-24

申请人： Hiroshi Uchiike ,  Kenji Ogasawara ,  Yoshiro Amano ,  Masahiro Shimizu ,  Shusuke Kurihara ,  Kazunari Tsuchimto ,  Nobuyuki Kitazaki ,  Shinji Ueno ,  Isao Yoneda ,  Yuji Yokoe ,  Fuminori Sai

发明人： Hiroshi Uchiike ,  Kenji Ogasawara ,  Yoshiro Amano ,  Masahiro Shimizu ,  Shusuke Kurihara ,  Kazunari Tsuchimto ,  Nobuyuki Kitazaki ,  Shinji Ueno ,  Isao Yoneda ,  Yuji Yokoe ,  Fuminori Sai

IPC分类号： G11B2102

CPC分类号： G11B19/04 ,  G11B5/54 ,  G11B21/12

摘要： A disk drive with means to prevent accidental landing of a head/slider on the disk surface is described. In one embodiment a shock sensor is provided to sense external shocks received by the mechanism. During loading (positioning) of the actuator bearing the head/slider over the disk, if a shock is sensed, loading is stopped and an immediate unloading is performed to return the actuator to the withdrawn position. In another embodiment the unload operation is performed when the rotational speed of the disk is changed. In another embodiment the unload operation is performed when the rotational speed of the disk drops below a threshold. A circuit and method for detecting when the rotational speed of the disk drops below a threshold is also provided. The unloading in the various embodiments may be performed using velocity control or without velocity control.

摘要翻译： 描述了具有防止头/滑块在盘表面上意外着落的装置的磁盘驱动器。 在一个实施例中，提供了一种震动传感器来感测由机构接收的外部冲击。 在将头/滑块轴承到盘上的执行器的装载（定位）期间，如果感测到冲击，则停止加载，并立即执行卸载以将执行器返回到撤回位置。 在另一个实施例中，当盘的旋转速度改变时执行卸载操作。 在另一个实施例中，当盘的转速下降到阈值以下时，执行卸载操作。 还提供了一种用于检测盘的转速何时下降到阈值以下的电路和方法。 各种实施例中的卸载可以使用速度控制或无速度控制来执行。

公开(公告)号：US5923491A

公开(公告)日：1999-07-13

申请号：US681411

申请日：1996-07-22

申请人： Masashi Kisaka ,  Nobuyuki Kitazaki ,  Takashi Nakamura ,  Yuji Yokoe ,  Isao Yoneda

发明人： Masashi Kisaka ,  Nobuyuki Kitazaki ,  Takashi Nakamura ,  Yuji Yokoe ,  Isao Yoneda

IPC分类号： G11B5/596 ,  G11B21/10

CPC分类号： G11B21/106 ,  G11B5/59627 ,  G11B5/59633

摘要： The present invention determines whether a filter is used for reading and writing on a disk to correct repeatable runout. The invention estimates the magnitude of repeatable runout for each disk by measuring the maximum absolute value of a state variable of a filter when the disk is turned on or when the disk returns from a sleep mode, and compares the measured value to a predetermined criterion such as the track width. If the magnitude of the repeatable runout is less than or equal to the predetermined criterion, the filter is not used. If the magnitude of the repeatable runout exceeds the predetermined criterion, the invention reads and writes data using the filter.

摘要翻译： 本发明确定滤波器是否用于读取和写入磁盘以校正可重复的跳动。 本发明通过测量当盘被打开时或当盘从睡眠模式返回时的过滤器的状态变量的最大绝对值，来估计每个盘的可重复跳动的幅度，并将测量值与预定标准 作为轨道宽度。 如果可重复跳动的幅度小于或等于预定标准，则不使用滤波器。 如果可重复跳动的幅度超过预定标准，本发明使用滤波器读取和写入数据。

公开(公告)号：US06515813B2

公开(公告)日：2003-02-04

申请号：US09764538

申请日：2001-01-17

申请人： Nobuyuki Kitazaki ,  Kenji Ogasawara ,  Yutaka Ozawa ,  Isao Yoneda

发明人： Nobuyuki Kitazaki ,  Kenji Ogasawara ,  Yutaka Ozawa ,  Isao Yoneda

IPC分类号： G11B509

CPC分类号： G11B5/59611 ,  G11B19/28 ,  G11B20/14

摘要： A method to enable servo information to be detected surely and stably even when a time interval between servo sectors is changed due to disk shifting. A time interval TS(i) is calculated according to an internal variable value, which is in proportion to a displacement &Dgr;r(i) of a servo area SF(i) in a radial direction of a subject disk (step S6). The displacement &Dgr;r(i) is calculated from already detected servo information[, thereby]. Thereby, a time interval for detecting servo information is adjusted according to the above described time interval TS(i) (steps S7 and S4). The time interval TS(i) is the time interval between passing of a servo sector in the servo area SF(i) under the head H and passing of a servo sector in the servo area SF(i+1) under the head H.

摘要翻译： 即使伺服扇区之间的时间间隔由于盘移动而改变，也能够确保和稳定地检测伺服信息。 时间间隔TS（i）根据内部变量值计算，该内部变量值与目标盘的径向方向上的伺服区域SF（i）的位移量DELTAr（i）成比例（步骤S6）。 从已经检测的伺服信息[由此]计算位移ΔTATA（i）。 由此，根据上述时间间隔TS（i）来调整用于检测伺服信息的时间间隔（步骤S7和S4）。 时间间隔TS（i）是在头部H下的伺服区域SF（i）中的伺服扇区通过之间的时间间隔，并且在头部H下的伺服区域SF（i + 1）中伺服扇区通过之间的时间间隔。

公开(公告)号：US06229663B1

公开(公告)日：2001-05-08

申请号：US09102971

申请日：1998-06-22

申请人： Isao Yoneda ,  Hiroshi Uchiike ,  Shinji Ueno ,  Kenji Ogasawara ,  Yoshihiko Aoki ,  Fuminori Sai

发明人： Isao Yoneda ,  Hiroshi Uchiike ,  Shinji Ueno ,  Kenji Ogasawara ,  Yoshihiko Aoki ,  Fuminori Sai

IPC分类号： G11B2112

CPC分类号： G11B19/28 ,  G11B5/54 ,  G11B19/04 ,  G11B21/12

摘要： The present invention provides a disk drive, a loading/unloading apparatus, and a method for controlling the apparatus, capable of improving the reliability of data by performing stable speed control. A disk drive comprises a VCM spindle driver for rotating a disk, a magnetic head, an actuator mechanism for moving a head slider having the magnetic head to a position above the surface of the magnetic disk and an unloaded position, a ramp block, and a CPU/HDC for performing the speed control of an actuator and the calibration control for detecting the offset and dynamic range of an AD converter before the speed control and controlling the operation for reading or writing data from or into the disk, which increases a rectangular current value to be applied to a voice coil while successively changing codes, measures an offset in accordance with the AD converter value for each current value, and moreover measures a dynamic range by deciding a nonlinear area when the difference between the expected value and measured value of the AD converter becomes a predetermined value or more.

摘要翻译： 本发明提供一种磁盘驱动器，装载/卸载装置以及用于控制装置的方法，能够通过执行稳定的速度控制来提高数据的可靠性。 磁盘驱动器包括用于旋转磁盘的VCM主轴驱动器，磁头，用于将具有磁头的磁头滑块移动到磁盘表面上方的位置的致动机构，以及卸载位置，斜坡块和 用于执行致动器的速度控制的CPU / HDC和用于在速度控制之前检测AD转换器的偏移和动态范围的校准控制，并且控制用于从盘读取或写入数据的操作，这增加了矩形电流 在连续更改代码的同时应用于音圈的值，根据每个当前值的AD转换器值测量偏移量，并且当预期值和测量值之间的差值决定非线性区域时，测量动态范围 AD转换器变为预定值以上。

公开(公告)号：US6108157A

公开(公告)日：2000-08-22

申请号：US105901

申请日：1998-06-26

申请人： Isao Yoneda ,  Hiroshi Uchiike ,  Shinji Ueno ,  Kenji Ogasawara

发明人： Isao Yoneda ,  Hiroshi Uchiike ,  Shinji Ueno ,  Kenji Ogasawara

IPC分类号： G11B21/02 ,  G11B5/40 ,  G11B5/54 ,  G11B19/04 ,  G11B21/12

CPC分类号： G11B5/54 ,  G11B21/12 ,  G11B19/04 ,  G11B5/40

摘要： The invention relates to a head mechanism control apparatus for magnetic recording device which ensures that the transducer head has been unloaded in a head unloading operation. A head slider having a transducer head is mounted on a head arm and is unloaded from the disk by the swinging of the head arm. The retract position is at the limit portion of the swingable range of the head arm. When the head slider is successfully unloaded to the retract position, a drive force applied to the head arm in the unload direction causes little movement of the head arm. After an unloading is performed, a position check drive force is applied to the head arm and the moving speed of the head slider is detected. Based on the moving speed, it is judged whether the head slider has been unloaded to the retract position. If the head slider has not been unloaded to the retract position, re-unloading is performed for moving the head slider to the retract position.

摘要翻译： 本发明涉及一种用于磁记录装置的磁头机构控制装置，其确保在磁头卸载操作中已经卸载了传感器头。 具有换能器头的头部滑块安装在头臂上，并通过头臂的摆动从盘上卸载。 缩回位置在头臂的摆动范围的极限部分。 当头滑块成功地卸载到缩回位置时，在卸载方向上施加到头臂的驱动力导致头臂几乎没有移动。 在执行卸载之后，向头臂施加位置检查驱动力，并且检测磁头滑块的移动速度。 基于移动速度，判断磁头滑块是否卸载到缩回位置。 如果磁头滑块未卸载到缩回位置，则执行重新卸载以将磁头滑块移动到缩回位置。

公开(公告)号：US20100142082A1

公开(公告)日：2010-06-10

申请号：US12631729

申请日：2009-12-04

申请人： Chikako Sakagami ,  Kazuhisa Shishida ,  Isao Yoneda ,  Kazuaki Usui ,  Hiroshi Uchida ,  Takeshi Saito ,  Kenji Tomida

发明人： Chikako Sakagami ,  Kazuhisa Shishida ,  Isao Yoneda ,  Kazuaki Usui ,  Hiroshi Uchida ,  Takeshi Saito ,  Kenji Tomida

IPC分类号： G11B21/02

CPC分类号： G11B5/5582 ,  G11B5/596 ,  G11B5/59622

摘要： A disk drive. The disk drive includes a head, a moving mechanism, a first peak filter, an adaptive peak filter, and a filter controller. The head is configured to read servo data on a disk at sampling frequency. The moving mechanism is configured to move the head in proximity with a recording surface of the disk. The first peak filter has a fixed peak frequency and a variable gain, and is configured to be inserted into a servo loop. The servo loop is configured to position the head with position error signals between servo data read by the head and a target position. The adaptive peak filter has a variable peak frequency and a variable gain, and is configured to be inserted into the servo loop. The filter controller is configured to control the gain of the adaptive peak filter according to the gain of the first peak filter.

摘要翻译： 磁盘驱动器 磁盘驱动器包括磁头，移动机构，第一峰值滤波器，自适应峰值滤波器和滤波器控制器。 磁头被配置为以采样频率读取磁盘上的伺服数据。 移动机构被配置为使磁头靠近磁盘的记录表面移动。 第一峰值滤波器具有固定的峰值频率和可变增益，并被配置为插入到伺服环路中。 伺服回路被配置为在头部读取的伺服数据与目标位置之间定位头部位置误差信号。 自适应峰值滤波器具有可变的峰值频率和可变增益，并被配置为插入到伺服环路中。 滤波器控制器被配置为根据第一峰值滤波器的增益来控制自适应峰值滤波器的增益。

公开(公告)号：US07724457B2

公开(公告)日：2010-05-25

申请号：US11201673

申请日：2005-08-10

申请人： Hien Dang ,  Isao Yoneda ,  Tetsuo Ueda ,  Yuzo Nakagawa ,  Sri M. Sri-Jayantha

发明人： Hien Dang ,  Isao Yoneda ,  Tetsuo Ueda ,  Yuzo Nakagawa ,  Sri M. Sri-Jayantha

IPC分类号： G11B5/09

CPC分类号： G11B5/59627 ,  G11B5/5582 ,  G11B5/596 ,  G11B25/043

摘要： A method (and structure) senses a rotational vibration of a disk drive. The disk drive includes a rotating disk. The disk includes a plurality of reference bits across a surface thereof. The method (and structure) includes detecting the reference bits across a pattern on the rotating disk, and analyzing a time interval between adjacent ones of the reference bits.

摘要翻译： 方法（和结构）感测磁盘驱动器的旋转振动。 磁盘驱动器包括旋转盘。 盘包括跨越其表面的多个参考位。 方法（和结构）包括检测旋转盘上的图案上的参考位，以及分析相邻参考位之间的时间间隔。

公开(公告)号：US07619849B2

公开(公告)日：2009-11-17

申请号：US11796228

申请日：2007-04-26

申请人： Hiroshi Uchida ,  Isao Yoneda ,  Hideki Ohzeki

发明人： Hiroshi Uchida ,  Isao Yoneda ,  Hideki Ohzeki

IPC分类号： G11B5/596

CPC分类号： G11B5/5526

摘要： Embodiments in accordance with the present invention provide a magnetic disk drive with reduced noise during seek operation without causing any delay in control response. According to one embodiment of the present invention, a control circuit of a magnetic disk drive controls the drive power supplied to a voice coil motor during a seek operation adapted to move a magnetic head over a target track formed on a magnetic disk so as to bring the travel speed of the magnetic head close to a predetermined target speed. The control circuit determines a provisional current according to the difference between the predetermined target speed and an actual travel speed in an acceleration zone adapted to accelerate the magnetic head to the predetermined target speed. If the provisional current exceeds a limit specified in relation to an elapsed time from the start of acceleration, the control circuit sets the limit as the current of the drive power supplied to the voice coil motor to control the motor.

摘要翻译： 根据本发明的实施例提供一种在寻道操作期间具有降低的噪声的磁盘驱动器，而不会导致控制响应的任何延迟。 根据本发明的一个实施例，磁盘驱动器的控制电路在搜索操作期间控制提供给音圈电机的驱动电力，以便将磁头移动到形成在磁盘上的目标磁道上，以便带动 磁头的行进速度接近预定的目标速度。 控制电路根据预定目标速度与适于将磁头加速到预定目标速度的加速区域中的实际行驶速度之间的差异来确定临时电流。 如果临时电流超过关于从加速开始起的经过时间规定的限制，则控制电路将限制设定为作为提供给音圈电动机的驱动电力的电流以控制电动机。