公开(公告)号：US08665549B2

公开(公告)日：2014-03-04

申请号：US13249041

申请日：2011-09-29

申请人： Thomas R. Albrecht ,  Toshiki Hirano ,  Tetsuo Semba ,  Xiaotian Sun

发明人： Thomas R. Albrecht ,  Toshiki Hirano ,  Tetsuo Semba ,  Xiaotian Sun

IPC分类号： G11B21/02 ,  G11B5/82

CPC分类号： G11B5/59688 ,  G11B5/59655

摘要： A magnetic data storage system having a magnetic disk having burst patterns for providing a position error signal (PES) wherein each magnetic burst pattern is offset from an adjacent burst pattern by ¼ track pitch. All of the magnetic bits of the burst patterns can be unipolar magnetized, and the bits of each burst pattern can be aligned with one another in radial and circumferential direction. The magnetic media can be a bit patterned media wherein the magnetic bits of the burst patterns are magnetically isolated portions separated by non-magnetic spaces or non-magnetic material.

摘要翻译： 一种磁数据存储系统，具有具有用于提供位置误差信号（PES）的脉冲串模式的磁盘，其中每个磁脉冲串模式从相邻脉冲串模式偏移1/4声道间距。 突发图案的所有磁位可以是单极磁化的，并且每个突发图案的位可以在径向和圆周方向上彼此对准。 磁介质可以是位图形介质，其中突发图案的磁位是被非磁性空间或非磁性材料隔开的磁隔离部分。

公开(公告)号：US20100067357A1

公开(公告)日：2010-03-18

申请号：US12211569

申请日：2008-09-16

申请人： Fu-Ying Huang ,  Tetsuo Semba ,  Xiaotian Sun

发明人： Fu-Ying Huang ,  Tetsuo Semba ,  Xiaotian Sun

IPC分类号： G11B17/00

CPC分类号： G11B5/5582 ,  G11B5/59627

摘要： A disk drive and a method for operating the disk drive compensates for rotational vibration (RV) by adaptively modifying the gains of two separate linear vibration sensors so the sensor gains are optimal under any given condition. The two sensors provide two signals S1, S2, respectively, to the disk drive's servo control processor that generates the control signal to the voice coil motor (VCM) actuator that controls the positioning of the read/write head. The processor uses S1, S2 and the head position error signal (PES) as inputs to run an adaptive RV feedforward (RVFF) algorithm. The adaptive RVFF algorithm takes the PES and sensor outputs S1 and S2 as inputs, mathematically determines the required correction to the sensor gain factors k1 and k2, respectively, and then adjusts the gain factors k1 and k2 accordingly. Each signal S1, S2 is then modified by its adjusted gain factor k1, k2, respectively. The difference in the modified S1, S2 signals is the RVFF signal that is summed with the control signal to generate the RV-compensated control signal to the VCM actuator.

摘要翻译： 磁盘驱动器和用于操作磁盘驱动器的方法通过自适应地修改两个单独的线性振动传感器的增益来补偿旋转振动（RV），使得传感器增益在任何给定条件下是最佳的。 两个传感器分别向磁盘驱动器的伺服控制处理器提供两个信号S1，S2，该伺服控制处理器产生对控制读/写头定位的音圈电机（VCM）致动器的控制信号。 处理器使用S1，S2和头位置误差信号（PES）作为输入来运行自适应RV前馈（RVFF）算法。 自适应RVFF算法将PES和传感器输出S1和S2作为输入，分别数学地确定传感器增益因子k1和k2所需的校正，然后相应地调整增益因子k1和k2。 然后，通过其调整的增益因子k1，k2来修改每个信号S1，S2。 修改后的S1，S2信号的差异是将RVFF信号与控制信号相加，以产生向VCM致动器的RV补偿的控制信号。

公开(公告)号：US07450335B2

公开(公告)日：2008-11-11

申请号：US11502069

申请日：2006-08-09

申请人： Toshiki Hirano ,  Tetsuo Semba ,  Matthew T. White

发明人： Toshiki Hirano ,  Tetsuo Semba ,  Matthew T. White

IPC分类号： G11B5/596

CPC分类号： G11B5/59627 ,  G11B5/6017

摘要： Methods and systems for reducing read/write head track misregistration are described. According to one embodiment, a first signal is received from a first capacitive sensor that faces a surface of a disk associated with a disk drive. A second signal is received from a second capacitive sensor that faces the surface of the disk. A determination is made as to whether the disk is being moved along its axis of rotation or whether the disk is tilting. Read/write head track misregistration is reduced based on the determination of whether the disk drive is being moved along an axis of rotation or whether the disk is tilting.

公开(公告)号：US07277258B2

公开(公告)日：2007-10-02

申请号：US11158445

申请日：2005-06-21

申请人： Toshiki Hirano ,  Fu-Ying Huang ,  Tetsuo Semba ,  Matthew T. White

发明人： Toshiki Hirano ,  Fu-Ying Huang ,  Tetsuo Semba ,  Matthew T. White

IPC分类号： G11B5/596 ,  G11B21/10 ,  G11B21/20

CPC分类号： G11B5/5552

摘要： A dual-stage actuator disk drive has both a rotary primary actuator and a rotary secondary actuator. When the primary actuator initiates a seek there are two torque components acting on the center of mass of the secondary actuator's moving portion. The center of rotation of the moving portion is located at an optimal location relative to the center of mass of the moving portion, which results in cancellation of the two torque components and a secondary actuator that has essentially no resonant frequency in response to a seek by the primary actuator. If the optimal location can not be achieved because of assembly tolerances, then the center of rotation is placed at a distance at least as great as the assembly tolerance from the optimal location.

摘要翻译： 双级致动器盘驱动器具有旋转主执行器和旋转次级致动器。 当主执行器启动寻道时，存在作用在辅助致动器的移动部分的质心的两个扭矩分量。 移动部分的旋转中心位于相对于移动部分的质心的最佳位置，这导致两个扭矩分量的消除，以及二次致动器，其基本上没有响应于寻道的共振频率 主执行器。 如果由于组装公差而无法实现最佳位置，则旋转中心的距离至少与最佳位置的组装公差一样大。

公开(公告)号：US20060158773A1

公开(公告)日：2006-07-20

申请号：US11335849

申请日：2006-01-18

申请人： Tetsuo Semba ,  Hiroshi Uchida

发明人： Tetsuo Semba ,  Hiroshi Uchida

IPC分类号： G11B5/596

CPC分类号： G11B5/5547 ,  G11B5/5586

摘要： In seek control for a head of a rotary recorder/reproducer, the seek time is reduced with noise reduced while utilizing a driving force of an actuator effectively. In one embodiment, when a microprocessor generates a control signal for a drive current given to an actuator for head seek, a signal generator generates a prespecified acceleration allowing for the allowable maximum acceleration when the actuator is accelerated, a prespecified deceleration signal allowing for the allowable maximum deceleration when the actuator is decelerated, and a zero level signal when the actuator is settled. Switching from deceleration to settling is performed at a point of time computed by the microprocessor as a time point when settling is to be started so that the head may reach a target position within the shortest period of time.

摘要翻译： 在用于旋转记录器/再现器的头部的寻道控制中，在有效地利用致动器的驱动力的同时，寻求时间减少，噪声降低。 在一个实施例中，当微处理器产生用于头部寻道的致动器的驱动电流的控制信号时，信号发生器产生预先指定的加速度，允许致动器加速时允许的最大加速度，预定的减速信号允许允许 执行器减速时的最大减速度，执行机构稳定时为零电平信号。 从减速到稳定的切换是在由微处理器计算的时间点作为开始建立的时间点执行的，以便头部可以在最短时间内到达目标位置。

公开(公告)号：US07079338B1

公开(公告)日：2006-07-18

申请号：US11145444

申请日：2005-06-03

申请人： Tetsuo Semba ,  Matthew T. White ,  Satoshi Yamamoto

发明人： Tetsuo Semba ,  Matthew T. White ,  Satoshi Yamamoto

IPC分类号： G11B27/36 ,  G11B21/02

CPC分类号： G11B5/5552 ,  G11B5/596 ,  G11B27/36 ,  G11B2220/20

摘要： A method in a dual-stage actuator disk drive tests if the secondary actuator has failed while the disk drive is in its normal track-following operating mode. The secondary actuator is removed from the control loop and the primary actuator maintains the read/write head on a data track in the track-following mode. The servo control processor generates a test signal to the secondary actuator and receives the position error signal (PES) as the read head detects the PES bursts in the data track being followed. The servo control processor calculates the response of the secondary actuator to the test signal by deconvolving the motion of the primary actuator from the PES. The calculated response is then compared with an expected response to determine if the secondary actuator has failed. The coherence function can be calculated to measure the statistical validity of the calculated secondary-actuator frequency response.

摘要翻译： 双级致动器磁盘驱动器中的方法在磁盘驱动器处于其正常跟踪跟踪操作模式时测试辅助致动器是否发生故障。 次级致动器从控制回路中移除，主执行器将跟踪模式中的读/写头保持在数据轨道上。 伺服控制处理器在辅助执行机构产生一个测试信号，并在读取头检测正在跟踪的数据轨道中的PES脉冲串时接收位置误差信号（PES）。 伺服控制处理器通过对来自PES的初级致动器的运动进行解卷积来计算辅助致动器对测试信号的响应。 然后将计算的响应与预期响应进行比较，以确定辅助致动器是否已经失败。 可以计算相干函数来测量所计算的辅助致动器频率响应的统计有效性。

公开(公告)号：US06831809B2

公开(公告)日：2004-12-14

申请号：US10086204

申请日：2002-02-27

申请人： Naoyuki Kagami ,  Kenji Okada ,  Tetsuo Semba ,  Akira Tokizono ,  Hiroshi Uchida ,  Akinori Yuba

发明人： Naoyuki Kagami ,  Kenji Okada ,  Tetsuo Semba ,  Akira Tokizono ,  Hiroshi Uchida ,  Akinori Yuba

IPC分类号： G11B5596

CPC分类号： G11B5/59622

摘要： A control arrangement having a feedforward system and a feedback system, a control model for generating reference position data from a feedforward control signal is separated into an original control model and a compensation filter. Gain of the feedforward control signal is compensated by a gain compensation circuit to form a feedforward control signal after compensation. The reference position data is input to a feedback controller, and a feedback control signal and feedforward control signal are input to a control object. Coefficients of the compensation filter and the gain compensation circuit are compensated on the basis of a head position trajectory obtained by actual seek operation.

摘要翻译： 具有前馈系统和反馈系统的控制装置，用于从前馈控制信号产生参考位置数据的控制模型被分离成原始控制模型和补偿滤波器。 前馈控制信号的增益由增益补偿电路补偿，以在补偿后形成前馈控制信号。 参考位置数据被输入到反馈控制器，反馈控制信号和前馈控制信号被输入到控制对象。 补偿滤波器和增益补偿电路的系数基于通过实际寻道操作获得的磁头位置轨迹进行补偿。

公开(公告)号：US06052345A

公开(公告)日：2000-04-18

申请号：US261927

申请日：1999-03-03

申请人： Allen Keith Bates ,  Nhan Xuan Bui ,  Alan August Fennema ,  Tetsuo Semba

发明人： Allen Keith Bates ,  Nhan Xuan Bui ,  Alan August Fennema ,  Tetsuo Semba

IPC分类号： G11B11/10 ,  G11B7/085 ,  G11B7/09 ,  G11B11/105

CPC分类号： G11B7/08541 ,  G11B11/10563 ,  G11B11/10576 ,  G11B11/10597 ,  G11B7/0901

摘要： The invention provides a system for compensating for hard sector noise degradation of tracking error signals in an optical data storage system. The system includes a hard sector detection circuit which generates a first output signal in response to receiving a first input signal representing detection of a hard sector on a magneto-optical disk; a logic circuit which generates a second output signal in response to receiving the first output signal and a second input signal; and a tracking error signal reconstruction circuit which generates an approximated tracking error signal in response to receiving a tracking error signal and the second output signal. The invention may be embodied as hardwired circuitry or as a combination of hardware and software embodied in a computer readable medium and implemented in a digital computer.

摘要翻译： 本发明提供了一种用于补偿光学数据存储系统中跟踪误差信号的硬扇区噪声劣化的系统。 该系统包括：硬扇区检测电路，响应于接收表示磁光盘上的硬扇区的检测的第一输入信号，产生第一输出信号; 响应于接收到第一输出信号和第二输入信号而产生第二输出信号的逻辑电路; 以及跟踪误差信号重建电路，其响应于接收到跟踪误差信号和所述第二输出信号而产生近似跟踪误差信号。 本发明可以实现为硬连线电路或者体现在计算机可读介质中并在数字计算机中实现的硬件和软件的组合。

公开(公告)号：US5768228A

公开(公告)日：1998-06-16

申请号：US711001

申请日：1996-09-09

申请人： Allen Keith Bates ,  Alan August Fennema ,  Tetsuo Semba

发明人： Allen Keith Bates ,  Alan August Fennema ,  Tetsuo Semba

IPC分类号： G11B7/085 ,  G11B7/09

CPC分类号： G11B7/08529 ,  G11B7/0903 ,  G11B7/0943

摘要： A method for cancelling optical servo crosstalk within an optical disk drive is disclosed. In accordance with the method and system of the present invention, the optical disk drive system includes a focus control module, a tracking control module, a variable frequency notch filter, and a lookup table. The focus control module is utilized for moving an objective lens in response to a focus error signal in order to maintain a laser beam in an in-focus condition on an optical disk. The tracking control module is utilized for moving a moving optical element in response to a tracking error signal to direct the laser beam onto a desired track position of the optical disk. The lookup table within the focus control module is utilized for storing several sets of tap coefficients for the variable frequency notch filter. An appropriate set of tap coefficients from the lookup table is supplied to the variable frequency notch filter in response to a head velocity signal from the tracking control module such that the effects caused by a false FES in the optical disk drive system are reduced.

摘要翻译： 公开了一种用于消除光盘驱动器内的光伺服串扰的方法。 根据本发明的方法和系统，光盘驱动系统包括聚焦控制模块，跟踪控制模块，可变频陷波滤波器和查找表。 焦点控制模块用于响应于聚焦误差信号移动物镜，以便将激光束保持在光盘上的对焦状态。 跟踪控制模块用于响应于跟踪误差信号移动移动光学元件以将激光束引导到光盘的期望轨道位置。 焦点控制模块内的查找表用于存储可变频率陷波滤波器的几组抽头系数。 响应于来自跟踪控制模块的头部速度信号，将来自查找表的适当的抽头系数集合提供给可变频率陷波滤波器，使得由光盘驱动系统中的假FES引起的影响减小。

公开(公告)号：US5504726A

公开(公告)日：1996-04-02

申请号：US223564

申请日：1994-04-06

申请人： Tetsuo Semba

发明人： Tetsuo Semba

IPC分类号： G11B7/095 ,  G11B7/085 ,  G11B7/09 ,  G11B21/10

CPC分类号： G11B7/094

摘要： The present invention makes possible the calibration of the tracking error signal and the focus error signal repeatedly when an optical disk drive is in the normal operation mode. Errors (offset and amplitude error) of the focus error signal and the tracking error signal are detected during at least three track jumps by making use of a track jump performed once per rotation of disk in the track following mode. An offset value of the focus error signal is calculated based on the amplitude of a tracking error signal generated during at least two track jumps by adding a positive or negative offset to the original target value of the focus error signal, and values of offset and amplitude error of the tracking error signal are calculated based on a maximum value and a minimum value of a tracking error signal generated during at least one track jump without modifying the original target value of the focus error signal.

摘要翻译： 本发明使得当光盘驱动器处于正常操作模式时可以重复地校准跟踪误差信号和聚焦误差信号。 通过利用在轨道跟随模式中的每次旋转一次执行一次轨道跳转，在至少三次跳跃期间检测聚焦误差信号和跟踪误差信号的误差（偏移和振幅误差）。 基于在至少两个轨道跳跃期间产生的跟踪误差信号的幅度，通过将正或负偏移加到聚焦误差信号的原始目标值，以及偏移和振幅的值来计算聚焦误差信号的偏移值 基于在至少一个轨道跳跃期间产生的跟踪误差信号的最大值和最小值而不修改聚焦误差信号的原始目标值来计算跟踪误差信号的误差。