公开(公告)号：US07133229B2

公开(公告)日：2006-11-07

申请号：US11056965

申请日：2005-02-10

Applicant: Tetsuo Semba

Inventor： Tetsuo Semba

IPC: G11B5/09

CPC classification number: G11B5/59627 ,  B82Y10/00 ,  G11B5/59616 ,  G11B5/746 ,  G11B20/10 ,  G11B27/30 ,  G11B2220/20

Abstract: A magnetic recording disk drive has a patterned magnetic recording disk with data blocks of magnetizable material separated by nonmagnetic regions, a write-clock-generation circuit for timing write pulses to the write head, and a rotational vibration sensor that adjusts the timing of the write pulses to correct for errors caused by rotational disturbances to the disk drive. The write-clock-generation circuit receives a reference clock signal synchronized to disk rotation and multiplies it to generate a higher-frequency write-clock signal. The write-clock-generation circuit includes a phase detector that compares the phase of the reference clock signal and the write-clock signal and provides an error signal. The output of the rotational vibration sensor is summed with the phase detector error signal to compensate for disk rotation speed changes caused by rotational disturbances.

公开(公告)号：US07079339B1

公开(公告)日：2006-07-18

申请号：US11145445

申请日：2005-06-03

Applicant: Tetsuo Semba ,  Matthew T. White ,  Satoshi Yamamoto

Inventor： Tetsuo Semba ,  Matthew T. White ,  Satoshi Yamamoto

IPC: G11B27/36 ,  G11B21/02

CPC classification number: G11B5/596 ,  G11B5/5552 ,  G11B27/36 ,  G11B2220/20

Abstract: A method for secondary-actuator failure-detection and recovery in a dual-stage actuator disk drive includes running a calibration test by the servo control processor and measuring the position of the secondary actuator relative to its neutral position in response to the calibration test. The secondary-actuator failure detection and calibration test can be performed on a regular schedule or at selected times, such as at disk drive start-up. With the primary actuator maintaining the read/write head on a data track in track-following mode, the servo control processor generates a test signal to the secondary actuator and receives a relative-position signal (RPS) from the relative-position sensor in response to the test signal. The test comprises two measurements: a measurement of the secondary actuator static characteristics, and a measurement of the secondary actuator dynamic characteristics.

Abstract translation: 在双级致动器盘驱动器中用于二次执行器故障检测和恢复的方法包括响应于校准测试，通过伺服控制处理器执行校准测试并相对于其中性位置测量次级致动器的位置。 二次执行器故障检测和校准测试可以按照时间表或选定的时间进行，例如在磁盘驱动器启动时执行。 通过主跟踪器将轨道追踪模式下的读/写头保持在数据轨道上，伺服控制处理器产生测试信号到辅助执行器，并响应于相对位置传感器接收相对位置信号（RPS） 到测试信号。 该测试包括两个测量：次级致动器静态特性的测量以及辅助致动器动态特性的测量。

公开(公告)号：US07035034B2

公开(公告)日：2006-04-25

申请号：US10442803

申请日：2003-05-21

Applicant: Tetsuo Semba ,  Naoyuki Kagami ,  Akira Tokizono ,  Gaku Ikedo

Inventor： Tetsuo Semba ,  Naoyuki Kagami ,  Akira Tokizono ,  Gaku Ikedo

IPC: G11B5/596

CPC classification number: G11B5/5526 ,  G11B5/5582

Abstract: A hard disk device includes a servo control unit that constitutes a servo loop for a head seek for performing read/write of data from/to a recording medium, a correction signal generation unit for generating a correction signal for correcting a control by the servo control unit based on an output of a predetermined sensor, and a correction signal control unit for estimating an effect of supplying the correction signal to the servo loop and for controlling whether or not the correction signal is to be supplied to the servo loop in response to a result of the estimation. Moreover, the gain of the sensor is dynamically controlled in response to the above estimation result.

公开(公告)号：US20060066985A1

公开(公告)日：2006-03-30

申请号：US10956908

申请日：2004-09-30

Applicant: Toshiki Hirano ,  Tetsuo Semba ,  Matthew White

Inventor： Toshiki Hirano ,  Tetsuo Semba ,  Matthew White

IPC: G11B5/596

CPC classification number: G11B5/00 ,  G11B5/59627

Abstract: A data recording disk drive has a plurality of capacitive sensors, each sensor facing a surface of an associated disk, a capacitance sensing circuit for converting the sensed capacitance to a voltage representative of the distance between the sensor and the disk surface, and a feedforward controller that receives the voltage signal. The feedforward controller has a transfer function with gain and phase characteristics designed to match the transfer function from the out-of-plane disk vibration to the position of the read/write head while accounting for the effects of the sensor dynamics and the dynamics of the actuator. The output from the feedforward controller is combined with the output from the disk drive's servo feedback controller so that the effects of disk vibration on track misregistration of the head are removed from the control signal to the actuator.

Abstract translation: 数据记录盘驱动器具有多个电容传感器，每个传感器面对相关盘的表面，用于将检测到的电容转换为表示传感器和盘表面之间的距离的电压的电容感测电路，以及前馈控制器 接收电压信号。 前馈控制器具有传递函数，其增益和相位特性被设计成将传播函数从平面外盘振动到读/写头的位置相匹配，同时考虑到传感器动力学和动力学的影响 执行器。 来自前馈控制器的输出与磁盘驱动器的伺服反馈控制器的输出相结合，使得磁盘振动对磁头的磁道重合失调的影响从控制信号中移除到执行机构。

公开(公告)号：US08724248B2

公开(公告)日：2014-05-13

申请号：US13306736

申请日：2011-11-29

Applicant: Abhishek Dhanda ,  Toshiki Hirano ,  Tetsuo Semba ,  Zvonimir Z. Bandic

Inventor： Abhishek Dhanda ,  Toshiki Hirano ,  Tetsuo Semba ,  Zvonimir Z. Bandic

IPC: G11B21/02

CPC classification number: G11B5/59627 ,  G11B5/59694 ,  G11B20/1217 ,  G11B2020/1228 ,  G11B2020/1238 ,  G11B2220/2516

Abstract: A method, apparatus and a data storage device are provided for implementing data track pitch adjustment for data written on a recordable surface of a storage device under operational vibration conditions. An operational vibration disturbance spectrum is detected during a write operation and the data track pitch is selectively adjusted based on the detected operational vibration disturbance spectrum. The adjusted track pitch information is saved and used during a read operation.

Abstract translation: 提供了一种方法，装置和数据存储装置，用于在操作的振动条件下为存储装置的可记录表面上写入的数据实现数据轨道间距调整。 在写入操作期间检测到操作的振动干扰频谱，并且基于检测到的操作振动干扰谱选择性地调整数据轨道间距。 调整后的音高信息在读取操作期间被保存和使用。

公开(公告)号：US08379342B2

公开(公告)日：2013-02-19

申请号：US12211569

申请日：2008-09-16

Applicant: Fu-Ying Huang ,  Tetsuo Semba ,  Xiaotian Sun

Inventor： Fu-Ying Huang ,  Tetsuo Semba ,  Xiaotian Sun

IPC: G11B21/02

CPC classification number: G11B5/5582 ,  G11B5/59627

Abstract: 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.

Abstract translation: 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，分别在传感器增益因子k1和k2上数学确定所需的校正，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：US07126784B2

公开(公告)日：2006-10-24

申请号：US11012460

申请日：2004-12-14

Applicant: Tetsuya Tamura ,  Tetsuo Semba ,  Hiroshi Uchida

Inventor： Tetsuya Tamura ,  Tetsuo Semba ,  Hiroshi Uchida

IPC: G11B5/596

CPC classification number: G11B5/5547

Abstract: In conventional magnetic disk drives where stream data are treated, seek operations are performed at unnecessarily high speeds. This put the magnetic disk drives at a disadvantage in suppressing noise, reducing power consumption, and lowering the costs of actuator components. In one embodiment of the invention, a magnetic disk drive comprises a magnetic disk medium; a magnetic head; a head actuator to move the magnetic head relative to the magnetic disk medium; and a controller configured to control the head actuator to move the magnetic head to record data to and reproduce data from the magnetic disk medium. The controller is configured to control the magnetic head to record stream data on the magnetic disk medium in such a manner that the stream data is recognizable as stream data. The controller is configured to detect a situation in which two or more stream data are to be recorded or reproduced concurrently so as to set a slower seek operation mode.

Abstract translation: 在处理流数据的常规磁盘驱动器中，以不必要的高速执行查找操作。 这使得磁盘驱动器处于抑制噪声，降低功耗和降低致动器部件成本的缺点。 在本发明的一个实施例中，磁盘驱动器包括磁盘介质; 磁头; 头致动器，用于相对于磁盘介质移动磁头; 以及控制器，被配置为控制头致动器以移动磁头以将数据记录到磁盘介质并从其再现数据。 控制器被配置为控制磁头以将流数据识别为流数据的方式在磁盘介质上记录流数据。 控制器被配置为检测要同时记录或再现两个或多个流数据以便设置较慢的寻道操作模式的情况。

公开(公告)号：US20060114601A1

公开(公告)日：2006-06-01

申请号：US11000680

申请日：2004-11-30

Applicant: Tetsuo Semba ,  Matthew White ,  Hiroshi Uchida

Inventor： Tetsuo Semba ,  Matthew White ,  Hiroshi Uchida

IPC: G11B5/596

CPC classification number: G11B5/5547

Abstract: Embodiments of the present invention provide a method and a system for generating optimal feedforward signal for the seek control to suppress the RTV (Random Transient Vibrations) and the seek acoustic noise. One aspect is directed to a method of providing a revised feedforward signal using an adaptive filter in a feedforward control system for controlling an actuator to move a head to seek a track and settle on the track of a disk in a disk drive apparatus. The method comprises performing a seek operation of the head using an initial feedforward signal; obtaining an error signal at settling after performing the seek operation; determining filter characteristics of the adaptive filter to minimize the error signal; and implementing the adaptive filter having the determined filter characteristics in the feedforward control system to produce a revised feedforward signal for controlling the actuator for moving the head in the disk drive apparatus.

Abstract translation: 本发明的实施例提供了一种用于产生用于搜索控制以抑制RTV（随机瞬态振荡）和寻呼声学噪声的最佳前馈信号的方法和系统。 一个方面涉及一种在前馈控制系统中使用自适应滤波器来提供修正的前馈信号的方法，用于控制致动器移动磁头以寻找磁道并将其稳定在盘驱动装置中的盘的轨道上。 该方法包括使用初始前馈信号来执行头的寻道操作; 在执行寻道操作之后获得沉降中的误差信号; 确定自适应滤波器的滤波器特性以最小化误差信号; 并且在前馈控制系统中实现具有确定的滤波器特性的自适应滤波器，以产生用于控制用于在盘驱动装置中移动磁头的致动器的修正前馈信号。

公开(公告)号：US20060072392A1

公开(公告)日：2006-04-06

申请号：US10956972

申请日：2004-09-30

Applicant: Tetsuo Semba ,  Matthew White ,  Eric Baugh

Inventor： Tetsuo Semba ,  Matthew White ,  Eric Baugh

IPC: G11B7/00

CPC classification number: G11B5/59627 ,  G11B5/5582

Abstract: Embodiments of the present invention provide a way to modify the controller of a HDD head actuator to increase the error rejection capability and suppress the wideband vibration that affects the head motion. In one embodiment, a system to suppress influence of an external disturbance to an actuator comprises a controller providing a controller output as an actuator input to drive an actuator; a feedback loop to feed a head signal at an output of the actuator back as an input to the controller to produce an error signal; and a plurality of peak filters coupled to the controller and having different peak frequencies. Each peak filter has a peak filter input including the error signal, and has a peak filter output. A supervisor module is coupled with the peak filters to selectively add or delete the peak filter output of each peak filter to the actuator input to drive the actuator.

Abstract translation: 本发明的实施例提供了一种修改HDD头致动器的控制器以增加误差抑制能力并抑制影响头部运动的宽带振动的方法。 在一个实施例中，抑制对致动器的外部干扰的影响的系统包括控制器，其提供控制器输出作为致动器输入以驱动致动器; 反馈回路，用于将致动器的输出端的头信号馈送到控制器，以产生误差信号; 以及耦合到控制器并具有不同峰值频率的多个峰值滤波器。 每个峰值滤波器都具有包括误差信号的峰值滤波器输入，并具有峰值滤波器输出。 主管模块与峰值滤波器耦合，以选择性地将每个峰值滤波器的峰值滤波器输出添加或删除到致动器输入以驱动致动器。

公开(公告)号：US5760991A

公开(公告)日：1998-06-02

申请号：US330945

申请日：1994-10-28

Applicant: Tetsuo Semba

Inventor： Tetsuo Semba

IPC: G11B5/55 ,  G11B5/596 ,  G11B7/085 ,  G11B7/09 ,  G11B21/10 ,  G11B7/00

CPC classification number: G11B5/556 ,  G11B5/5547 ,  G11B5/59627 ,  G11B7/08517 ,  G11B7/08529

Abstract: A disk storage unit according to the present invention comprises a disk for storing data, a head for at least reading data stored on the disk, a controller for controlling a seek operation in which the head moves from a current track to a target track and a tracking operation in which the head tracks the target track after reaching the target track, based on a tracking error signal, and a device for adding a dc offset to the tracking error signal so that head drive power having a direction opposite that of the seek operation and corresponding to the velocity of the head in the seek operation is generated after the head has reached the target track and the seek operation has been switched to the tracking operation.

Abstract translation: 根据本发明的磁盘存储单元包括用于存储数据的磁盘，用于至少读取存储在磁盘上的数据的磁头，用于控制磁头从当前磁道移动到目标磁道的寻道操作的控制器，以及 跟踪操作，其中，在跟踪误差信号到达目标轨道之后，磁头跟踪目标磁道，以及用于将跟踪误差信号添加直流偏移的装置，使得具有与寻道操作相反的方向的磁头驱动功率 并且在头部到达目标轨迹并且搜索操作已被切换到跟踪操作之后产生与寻道操作中的头部的速度相对应的速度。