公开(公告)号：US20080037155A1

公开(公告)日：2008-02-14

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： G11B21/02 ,  G11B19/02

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.

摘要翻译： 描述了用于减少读/写磁头轨迹重合失调的方法和系统。 根据一个实施例，从面对与磁盘驱动器相关联的盘的表面的第一电容传感器接收第一信号。 从面向盘表面的第二电容传感器接收第二信号。 确定盘是否沿其旋转轴线移动或盘是否倾斜。 基于确定磁盘驱动器是沿着旋转轴移动还是旋转的磁盘是否被读取/写入磁头轨迹重合不足。

公开(公告)号：US07292407B2

公开(公告)日：2007-11-06

申请号：US10956919

申请日：2004-09-30

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

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

IPC分类号： G11B33/14 ,  G11B5/012 ,  G11B17/00

CPC分类号： G11B5/58 ,  G11B5/5582 ,  G11B5/596 ,  G11B33/08

摘要： A data recording disk drive has one or more capacitive sensors for sensing out-of-plane vibration of the disk or disks. The sensors are attached to a support structure that is attached to the disk drive housing. Each sensor is associated with a disk and faces a surface of the disk near the outer perimeter of the disk and close to the recording head. The support structure can be made of a metal or a high-strength plastic and can be a separate structure mounted to the housing, or integrated as part of the single-piece housing casting. If it is metallic, as would be the case if it were integrated with the housing, then layers of insulating material separate the sensors from the support structure. A support structure that serves other functions in the disk drive can also function as the support structure for the capacitive sensors.

摘要翻译： 数据记录磁盘驱动器具有用于感测盘或盘的平面外振动的一个或多个电容传感器。 传感器连接到附接到磁盘驱动器外壳的支撑结构。 每个传感器与磁盘相关联并且面对靠近盘的外周边的盘的表面并且靠近记录头。 支撑结构可以由金属或高强度塑料制成，并且可以是安装到壳体的单独结构，或者作为单件式外壳铸件的一部分集成。 如果是金属的，如果将其与外壳结合在一起，则绝缘材料层将传感器与支撑结构分开。 用于磁盘驱动器中的其他功能的支撑结构也可以用作电容式传感器的支撑结构。

公开(公告)号：US07206162B2

公开(公告)日：2007-04-17

申请号：US11000680

申请日：2004-11-30

申请人： Tetsuo Semba ,  Matthew White ,  Hiroshi Uchida

发明人： Tetsuo Semba ,  Matthew White ,  Hiroshi Uchida

IPC分类号： G11B5/596 ,  G11B5/58 ,  G11B5/55

CPC分类号： G11B5/5547

摘要： 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.

摘要翻译： 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：US07177113B1

公开(公告)日：2007-02-13

申请号：US11196874

申请日：2005-08-03

申请人： Tetsuo Semba ,  Matthew T. White ,  Kevin I. Tzou

发明人： Tetsuo Semba ,  Matthew T. White ,  Kevin I. Tzou

IPC分类号： G11B5/596

CPC分类号： G11B5/5582

摘要： A magnetic recording disk drive with rotational vibration (RV) cancellation uses the position error signal (PES) and the signal from a RV sensor to determine when to enable and disable RV cancellation. An RV feedforward compensation signal to be summed with the VCM control signal is “switchable”, meaning that it can be enabled or disabled by the disk drive servo control processor. The determination to enable or disable is made from a comparison of the PES with a threshold PES, which may be an estimate of the off-track position of the head calculated from the RV sensor signal. The estimated off-track is compared to the absolute value of the actual or measured PES. If the estimated off-track is smaller than the actual PES, then the state of the RV cancellation is switched, i.e., if it is enabled it is disabled and if it is disabled it is enabled.

摘要翻译： 具有旋转振动（RV）消除的磁记录盘驱动器使用位置误差信号（PES）和来自RV传感器的信号来确定何时启用和禁用RV取消。 与VCM控制信号相加的RV前馈补偿信号是“可切换的”，这意味着它可以由磁盘驱动器伺服控制处理器启用或禁用。 通过PES与阈值PES的比较来确定启用或禁用，阈值PES可以是从RV传感器信号计算出的头部的偏离轨迹位置的估计。 将估计的偏离轨道与实际或测量的PES的绝对值进行比较。 如果估计的偏离轨迹小于实际的PES，则RV切换的状态被切换，即如果启用，则它被禁用，并且如果被禁用，则其被使能。

公开(公告)号：US07133229B2

公开(公告)日：2006-11-07

申请号：US11056965

申请日：2005-02-10

申请人： Tetsuo Semba

发明人： Tetsuo Semba

IPC分类号： G11B5/09

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

摘要： 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

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： G11B5/596 ,  G11B5/5552 ,  G11B27/36 ,  G11B2220/20

摘要： 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.

摘要翻译： 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

申请人： Tetsuo Semba ,  Naoyuki Kagami ,  Akira Tokizono ,  Gaku Ikedo

发明人： Tetsuo Semba ,  Naoyuki Kagami ,  Akira Tokizono ,  Gaku Ikedo

IPC分类号： G11B5/596

CPC分类号： G11B5/5526 ,  G11B5/5582

摘要： 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

申请人： Toshiki Hirano ,  Tetsuo Semba ,  Matthew White

发明人： Toshiki Hirano ,  Tetsuo Semba ,  Matthew White

IPC分类号： G11B5/596

CPC分类号： G11B5/00 ,  G11B5/59627

摘要： 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.

摘要翻译： 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：US20140055883A1

公开(公告)日：2014-02-27

申请号：US13593991

申请日：2012-08-24

申请人： Abhishek Dhanda ,  Toshiki Hirano ,  Tetsuo Semba

发明人： Abhishek Dhanda ,  Toshiki Hirano ,  Tetsuo Semba

IPC分类号： G11B5/596

CPC分类号： G11B20/1252 ,  G11B5/09 ,  G11B5/5543 ,  G11B5/56 ,  G11B5/59694 ,  G11B2020/1238

摘要： A data storage device with improved data storage densities, coupled with lower hard error and write-inhibit events is described. A feed-forward write inhibit (FFWI) method enables data tracks to be written more densely. Alternatively, the FFWI method may reduce the hard error and write inhibit events to improve data storage performance. A concept of virtual tracks enables the FFWI method to be applied to the writing of circular data tracks with non-circular servo tracks, or to the writing of non-circular data tracks with PES data from circular servo tracks—in both cases, improvements to performance and/or storage densities are enabled. The FFWI method may also be applied to the case of both non-circular servo and data tracks.

摘要翻译： 描述了具有改进的数据存储密度以及更低的硬错误和禁止写入事件的数据存储设备。 前馈写禁止（FFWI）方法使数据轨道更加密集地写入。 或者，FFWI方法可以减少硬错误和写禁止事件以提高数据存储性能。 虚拟轨道的概念使得FFWI方法能够应用于用非圆形伺服轨迹写入圆形数据轨道，或者用于从圆形伺服轨迹写入具有PES数据的非圆形数据轨迹 - 在这两种情况下，改进 性能和/或存储密度启用。 FFWI方法也可以应用于非圆形伺服和数据轨道的情况。

公开(公告)号：US08363348B2

公开(公告)日：2013-01-29

申请号：US12924880

申请日：2010-10-07

申请人： Toshiki Hirano ,  Jeffrey S. Lille ,  Tetsuo Semba

发明人： Toshiki Hirano ,  Jeffrey S. Lille ,  Tetsuo Semba

IPC分类号： G11B5/09 ,  G11B5/596

CPC分类号： G11B5/59655

摘要： Patterned magnetic media are described in which the servo sectors include at least two PES offset segments that can be used for the position error signal (PES) and identification of local track position. The two PES offset segments deviate from the track centerline in opposite directions. The lengths of the offset PES offset segments are systematically varied in a repeating pattern to provide a unique servo signal pattern for each track in a local group of adjacent tracks. The locally unique servo sector pattern allows the servo system to use the pattern of the signals generated from the offset and non-offset segments to determine the local track position, which is similar to information provided by the low order Gray code bits in prior art designs. Therefore, the number of bits in the track ID code can be reduced.

摘要翻译： 描述了图形磁介质，其中伺服扇区包括可用于位置误差信号（PES）和识别本地轨道位置的至少两个PES偏移段。 两个PES偏移片段在相反方向偏离轨道中心线。 偏移PES偏移段的长度以重复模式系统地改变，以为本地相邻轨道组中的每个轨道提供唯一的伺服信号模式。 本地唯一的伺服扇区模式允许伺服系统使用从偏移和非偏移段产生的信号的模式来确定本地轨道位置，其类似于现有技术设计中的低阶格雷码位提供的信息 。 因此，可以减少轨道ID码中的比特数。