公开(公告)号：US06972924B1

公开(公告)日：2005-12-06

申请号：US10816997

申请日：2004-04-02

申请人： Yih-Jen Dennis Chen ,  Jiasheng Zhu ,  Robert J. McNab

发明人： Yih-Jen Dennis Chen ,  Jiasheng Zhu ,  Robert J. McNab

IPC分类号： G11B5/48 ,  G11B5/55 ,  G11B5/596

CPC分类号： G11B5/5556 ,  G11B5/4813

摘要： A disk drive is disclosed employing a primary actuator for rotating an actuator arm about a pivot in coarse movements, and first and second secondary actuators coupled to the actuator arm for actuating first and second heads in fine movements. A servo control system generates a first control signal applied to the first secondary actuator to position the first head over the first disk surface in fine movements while accessing the first disk surface. The servo control system phase shifts the first control signal by a predetermined phase to generate a second control signal applied to the second secondary actuator to attenuate excitation of at least one arm vibration mode.

摘要翻译： 公开了一种磁盘驱动器，其采用主致动器，用于在粗略运动中围绕枢轴旋转致动器臂，以及联接到致动器臂的第一和第二辅助致动器，用于以精细运动致动第一和第二磁头。 伺服控制系统产生施加到第一辅助致动器的第一控制信号，以便在访问第一盘表面时以优良的运动将第一磁头定位在第一磁盘表面上。 伺服控制系统将第一控制信号相移一预定相位，以产生施加到第二辅助致动器的第二控制信号，以衰减至少一个臂振动模式的激励。

公开(公告)号：US07502192B1

公开(公告)日：2009-03-10

申请号：US11484492

申请日：2006-07-11

申请人： Zhi Wang ,  Min Chen ,  Robert J. McNab ,  Jenghung Cheng

发明人： Zhi Wang ,  Min Chen ,  Robert J. McNab ,  Jenghung Cheng

IPC分类号： G11B21/02 ,  G11B5/596

CPC分类号： G11B5/59627

摘要： A method is disclosed for efficiently determining and writing repeatable runout (RRO) compensation value sets for data tracks on a magnetic disk in a disk drive. The disk drive has a magnetoresistive (MR) head having a read element and a separate write element, and a secondary actuator coupled to the end of a primary actuator for adjusting a head skew angle. In the method, the head skew angle is set such that the read and write elements are substantially aligned along the first track. A position error signal for each servo sector is determined over a predetermined number of disk revolutions during track following along a first data track. An RRO compensation value set is calculated for the first data track based on the position error signals. The RRO compensation value set is written for the first data track. A seek operation is then performed to a second data track.

摘要翻译： 公开了一种用于有效地确定和写入磁盘驱动器中的磁盘上的数据轨迹的可重复跳动（RRO）补偿值集合的方法。 磁盘驱动器具有磁阻（MR）磁头，其具有读取元件和单独的写入元件，以及耦合到主致动器的端部用于调整磁头倾斜角度的次级致动器。 在该方法中，头部偏斜角被设置为使得读取和写入元件沿着第一轨道基本对齐。 在沿着第一数据轨道的跟踪期间，在预定数量的盘转周期上确定每个伺服扇区的位置误差信号。 基于位置误差信号计算第一数据磁道的RRO补偿值集。 为第一个数据轨道写入RRO补偿值集。 然后对第二数据轨道执行寻道操作。

公开(公告)号：US07304819B1

公开(公告)日：2007-12-04

申请号：US11165638

申请日：2005-06-23

申请人： Hemant Melkote ,  Robert J. McNab

发明人： Hemant Melkote ,  Robert J. McNab

IPC分类号： G11B5/596

CPC分类号： G11B5/59627

摘要： A method is disclosed for writing repeatable runout (RRO) correction values to a disk of a disk drive. The disk has distributed position information in a plurality of embedded servo sectors. The transducer head has a read element that is offset from a write element. The write element is positioned over a target track while the distributed position information from a followed track is read using the read element. The target track is different from the followed track due to the offset between the read element and the write element. Previously determined RRO correction values associated with the target track are written at radial positions on the target track. The radial positions are based on the distributed position information of the followed track, previously determined RRO correction values associated with the followed track, and a portion of the previously determined RRO correction values associated with the target track.

摘要翻译： 公开了一种用于将可重复跳动（RRO）校正值写入磁盘驱动器的盘的方法。 盘在多个嵌入式伺服扇区中具有分布位置信息。 换能器头具有与写入元件偏移的读取元件。 写入元件位于目标轨道上，而使用读取元素读取来自跟踪轨迹的分布位置信息。 由于读取元件和写入元件之间的偏移，目标轨迹与跟踪轨迹不同。 与目标轨道相关联的先前确定的RRO校正值被写入目标轨道上的径向位置。 径向位置基于跟踪轨迹的分布位置信息，与跟踪轨迹相关联的先前确定的RRO校正值以及与目标轨迹相关联的先前确定的RRO校正值的一部分。

公开(公告)号：US07280319B1

公开(公告)日：2007-10-09

申请号：US11047400

申请日：2005-01-31

申请人： Robert J. McNab

发明人： Robert J. McNab

IPC分类号： G11B5/44

CPC分类号： G11B5/4826 ,  G11B5/4853 ,  G11B5/486 ,  G11B5/5552

摘要： A suspension assembly includes a load beam, a mount plate, first and second piezoelectric microactuators, and a flex circuit segment. The first piezoelectric microactuator is electrically non-conductively attached to the load beam and the mount plate. The first piezoelectric microactuator includes a first piezoelectric element, a first top electrode, and a first bottom electrode. The second piezoelectric microactuator is electrically non-conductively attached to the load beam and the mount plate. The second piezoelectric microactuator includes a second piezoelectric element, a second top electrode, and a second bottom electrode. The flex circuit segment is disposed folded about the first and second piezoelectric microactuators. The flex circuit segment is in electrical communication with the first top electrode, the first bottom electrode, the second top electrode, and the second bottom electrode.

摘要翻译： 悬架组件包括负载梁，安装板，第一和第二压电微致动器以及柔性电路段。 第一压电微致动器电连接到负载梁和安装板上。 第一压电微致动器包括第一压电元件，第一顶电极和第一底电极。 第二压电微致动器非电导地连接到负载梁和安装板。 第二压电微致动器包括第二压电元件，第二顶电极和第二底电极。 柔性电路段被设置成围绕第一和第二压电微致动器折叠。 柔性电路段与第一顶电极，第一底电极，第二顶电极和第二底电极电连通。

公开(公告)号：US06924959B1

公开(公告)日：2005-08-02

申请号：US10651408

申请日：2003-08-29

申请人： Hemant Melkote ,  Robert J. McNab ,  David D. Nguyen ,  John Yin Kwong Li

发明人： Hemant Melkote ,  Robert J. McNab ,  David D. Nguyen ,  John Yin Kwong Li

IPC分类号： G11B5/596

CPC分类号： G11B5/59627

摘要： A method for reducing an estimation period for repeatable runout (RRO) errors in a disk drive comprising a head, a disk surface having a track partitioned by servo-wedges, and a servo control system for controlling the movement of the head relative to a track during revolutions of the disk. The method includes estimating the RRO errors of the track based on a) a series of position error signal values obtained during a current revolution of the disk surface, and b) a previous estimation of the RRO errors of the track obtained during a previous revolution of the disk surface and determining a differential value between a first measure of the estimated RRO errors and a second measure of the previous estimation of RRO errors, and repeating the estimating and determining for subsequent revolutions of the disk surface until the determined differential value is smaller than a pre-selected threshold value.

摘要翻译： 一种用于减少磁盘驱动器中可重复跳动（RRO）误差的估计周期的方法，包括磁头，具有由伺服楔形分隔的磁道的磁盘表面以及用于控制磁头相对于磁道的运动的伺服控制系统 在盘的转动期间。 该方法包括：基于a）在磁盘表面的当前旋转期间获得的一系列位置误差信号值来估计轨道的RRO误差，以及b）先前对先前转动期间获得的轨道的RRO误差的估计 磁盘表面，并且确定估计的RRO误差的第一测量值与先前RRO误差估计的第二测量值之间的差值，并重复估计并确定盘表面的后续转数，直到所确定的微分值小于 预先选择的阈值。

公开(公告)号：US07298574B1

公开(公告)日：2007-11-20

申请号：US11431303

申请日：2006-05-10

申请人： Hemant Melkote ,  Robert J. McNab

发明人： Hemant Melkote ,  Robert J. McNab

IPC分类号： G11B21/02 ,  G11B5/58 ,  G11B5/596 ,  G11B15/12

CPC分类号： G11B5/59616 ,  G11B5/59633 ,  G11B5/59666

摘要： Servo writing a disk of a disk drive is disclosed. A phase locked loop (PLL) is synchronized to first sectors previously written on a first track, and second sectors are written to a second track using the PLL, wherein a plurality of phase errors corresponding to the second sectors are saved. A correction value is computed corresponding to a selected one of the second sectors, wherein the correction value is computed in response to a plurality of the phase errors generated for a plurality of the second sectors leading the selected sector. The PLL is synchronized to the second sectors using the correction value, a third sector is written to a third track using the PLL, and a phase error is saved corresponding to the third sector.

摘要翻译： 公开了写入磁盘驱动器的磁盘的伺服。 锁相环（PLL）与先前写在第一磁道上的第一扇区同步，并且使用PLL将第二扇区写入第二磁道，其中保存对应于第二扇区的多个相位误差。 对应于所选择的第二扇区之一来计算校正值，其中响应于导致所选扇区的多​​个第二扇区产生的多个相位误差来计算校正值。 PLL使用校正值与第二扇区同步，使用PLL将第三扇区写入第三磁道，并且相应于第三扇区保存相位误差。

公开(公告)号：US06972922B1

公开(公告)日：2005-12-06

申请号：US10360206

申请日：2003-02-07

申请人： Jai N. Subrahmanyam ,  Jack M. Chue ,  Robert J. McNab

发明人： Jai N. Subrahmanyam ,  Jack M. Chue ,  Robert J. McNab

IPC分类号： G11B5/596

CPC分类号： G11B5/59627

摘要： A disk drive includes a sampled servo controller for periodically adjusting a control effort signal during a track-following operation based on embedded distributed position information and repeatable runout (RRO) cancellation values for reducing effects of RRO in the distributed position information during track following. A magnetic disk in the disk drive stores RRO information relating to predetermined RRO cancellation values for a data storage track. The RRO information for the data storage track includes at least one first data structure having a first predetermined number of data bits for representing an initial RRO cancellation value, and includes at least one second data structure having a second predetermined number of data bits associated with a respective subsequent RRO cancellation value. The first predetermined number of data bits is greater than the second predetermined number of data bits.

摘要翻译： 磁盘驱动器包括采样伺服控制器，用于基于嵌入的分布位置信息和可重复跳动（RRO）抵消值周期性地调整跟踪操作期间的控制努力信号，以减少跟踪期间分布位置信息中RRO的影响。 磁盘驱动器中的磁盘存储与用于数据存储轨道的预定RRO取消值相关的RRO信息。 用于数据存储轨道的RRO信息包括至少一个第一数据结构，其具有用于表示初始RRO抵消值的第一预定数量的数据位，并且包括至少一个第二数据结构，其具有第二预定数量的与 各自随后的RRO抵消值。 第一预定数量的数据位大于第二预定数量的数据位。

公开(公告)号：US06937420B1

公开(公告)日：2005-08-30

申请号：US10856658

申请日：2004-05-28

申请人： Robert J. McNab ,  Hemant Melkote

发明人： Robert J. McNab ,  Hemant Melkote

IPC分类号： G11B5/596 ,  G11B21/02

CPC分类号： G11B5/59655 ,  G11B5/59627 ,  G11B5/59661 ,  G11B5/59666

摘要： Disclosed is a method for generating a repeatable runout (RRO) compensation value set for a circular track on a magnetic medium on a surface of a disk in a disk drive. The magnetic medium has a plurality of previously written spiral servo tracks for providing position information during a self servo-writing operation. In the method, servo burst patterns are written at a plurality of radial locations on the magnetic data storage surface during circular tracking operations using the spiral servo tracks, and respective position error signals generated during the circular tracking operations are stored. The servo burst patterns at the plurality of radial locations define a circular data track. The RRO compensation value set for the circular data track may be generated based on the respective stored position error signals generated during the circular tracking operations for writing the servo burst patterns at the plurality of radial locations.

摘要翻译： 本发明公开了一种用于为盘驱动器中的盘表面上的磁介质上的圆形轨道生成可重复跳动（RRO）补偿值的方法。 磁介质具有多个预先写入的螺旋伺服磁道，用于在自伺服写入操作期间提供位置信息。 在该方法中，在使用螺旋伺服磁道的循环跟踪操作期间，在磁数据存储表面上的多个径向位置处写入伺服脉冲串图形，并且存储在循环跟踪操作期间产生的各个位置误差信号。 多个径向位置处的伺服脉冲串图案限定圆形数据轨迹。 可以基于在用于在多个径向位置处写入伺服脉冲串图案的循环跟踪操作期间产生的相应存储的位置误差信号来生成针对圆形数据轨道设置的RRO补偿值。

公开(公告)号：US06900958B1

公开(公告)日：2005-05-31

申请号：US10632434

申请日：2003-07-31

申请人： Li Yi ,  Yanbin Song ,  David A. Spaulding ,  Arafat M. Butt ,  Robert J. McNab ,  David D. Nguyen

发明人： Li Yi ,  Yanbin Song ,  David A. Spaulding ,  Arafat M. Butt ,  Robert J. McNab ,  David D. Nguyen

IPC分类号： G11B5/55 ,  G11B5/596

CPC分类号： G11B5/59627 ,  G11B5/5582 ,  G11B5/59694

摘要： A method is disclosed for improving head position accuracy in a disk drive during track following of concentric data storage tracks through real-time identification of external vibration and monitoring of write-unsafe (WUS) occurrences. In the method, after a seek operation to a predetermined data storage track, the track is followed using a servo control loop having a nominal gain and responsive to a position error signal (PES). After waiting a vibration detection delay period, occurrences of the PES exceeding a WUS limit are counted generating a WUS limit exception count. Also, a property of a variance is determined from spectral power values generated from the PES during track following. If the WUS limit exception count exceeds a first threshold, and if the property of the variance exceeds a second threshold, the nominal gain is increased to a vibration gain within a frequency band, to attenuate the effect of external vibration.

摘要翻译： 公开了一种用于通过实时识别外部振动和监视写入不安全（WUS）事件来提高同步数据存储轨道跟踪期间磁盘驱动器中磁头位置精度的方法。 在该方法中，在对预定数据存储轨迹进行搜索操作之后，使用具有额定增益并响应于位置误差信号（PES）的伺服控制回路跟踪轨道。 在等待振动检测延迟时间之后，对超出WUS限制的PES的发生进行计数，生成WUS限制异常计数。 此外，由跟踪期间的PES生成的频谱功率值确定方差的属性。 如果WUS限制异常计数超过第一阈值，并且如果方差性质超过第二阈值，则标称增益增加到频带内的振动增益，以衰减外部振动的影响。

公开(公告)号：US08756776B1

公开(公告)日：2014-06-24

申请号：US12579263

申请日：2009-10-14

申请人： Yih-Jen D. Chen ,  Robert J. McNab

发明人： Yih-Jen D. Chen ,  Robert J. McNab

IPC分类号： G11B5/84 ,  H01L41/22

CPC分类号： G11B5/483 ,  G11B5/4826 ,  G11B5/4873 ,  H01L41/053 ,  H01L41/0533 ,  H01L41/0986 ,  H01L41/23 ,  H01L41/25 ,  H01L41/253 ,  H01L41/338 ,  H02N1/008 ,  H02N2/22 ,  Y10T29/42 ,  Y10T29/49025 ,  Y10T29/49146 ,  Y10T29/49155

摘要： A method of manufacturing a microactuator. The method includes providing a sheet of a piezoelectric material having an electrically conductive layer on at least one side of the sheet. The method includes cutting the sheet to form a plurality of piezoelectric elements. Each of the piezoelectric elements includes a first element side with an electrically conductive layer. Each first element side includes a peripheral portion and an exposed portion interior to the peripheral portion. The method includes forming an encapsulation layer over the peripheral portion and not over the exposed portion of at least one of the sides. The encapsulation layer comprises a material of lesser electrical conductivity than the electrically conductive layer. An apparatus for manufacturing the microactuators may also be provided that includes a first fixture and first and second alignment combs.

摘要翻译： 微致动器的制造方法。 该方法包括在片材的至少一侧上提供具有导电层的压电材料片。 该方法包括切割片材以形成多个压电元件。 每个压电元件包括​​具有导电层的第一元件侧。 每个第一元件侧包括周边部分和外围部分内部的暴露部分。 该方法包括在周边部分上形成封装层，而不是在至少一个侧面的暴露部分之上。 封装层包括比导电层更小导电性的材料。 还可以提供一种用于制造微致动器的装置，其包括第一固定装置和第一和第二对准梳。