公开(公告)号：US20080158722A1

公开(公告)日：2008-07-03

申请号：US11619176

申请日：2007-01-02

Applicant: Jirou Abe ,  Gaku Ikedo ,  Tetsuo Semba

Inventor： Jirou Abe ,  Gaku Ikedo ,  Tetsuo Semba

IPC: G11B5/596

CPC classification number: G11B5/59622

Abstract: A disk drive uses a hybrid analog-digital acceleration feedforward control system and method for cancellation of rotational disturbances. A rotational vibration (RV) sensor is used with an analog circuit to generate an analog feedforward signal that is summed with the analog actuator control signal from the servo control processor. The analog feedforward signal is also converted to a digital feedforward signal and input to the processor. When the actuator gain deviates from its design value, the processor retrieves the appropriate actuator gain value from a lookup table. The processor uses the actuator gain value and the digital feedforward signal to calculate a modified feedforward signal, which is a fraction of the digital feedforward signal. The processor also calculates a feedback control value from the servo positioning information and a feedback controller. The modified feedforward signal is then summed with the feedback control value to generate the digital actuator control signal, which is converted to the analog actuator control signal. If the actuator gain is at its design value, the calculated modified feedforward signal is zero so the digital feedforward signal is not used.

Abstract translation: 磁盘驱动器使用混合模拟数字加速前馈控制系统和方法来消除旋转干扰。 旋转振动（RV）传感器与模拟电路一起使用，以产生与来自伺服控制处理器的模拟致动器控制信号相加的模拟前馈信号。 模拟前馈信号也转换为数字前馈信号并输入到处理器。 当执行器增益偏离其设计值时，处理器从查找表中检索适当的执行器增益值。 处理器使用执行器增益值和数字前馈信号来计算修改的前馈信号，这是数字前馈信号的一小部分。 处理器还从伺服定位信息和反馈控制器计算反馈控制值。 然后将修改的前馈信号与反馈控制值相加以产生数字致动器控制信号，其被转换为模拟致动器控制信号。 如果执行器增益处于其设计值，则计算的修改前馈信号为零，因此不使用数字前馈信号。

公开(公告)号：US07375916B2

公开(公告)日：2008-05-20

申请号：US11378459

申请日：2006-03-17

Applicant: Tetsuo Semba ,  Matthew T. White ,  Kevin I. Tzou

Inventor： Tetsuo Semba ,  Matthew T. White ,  Kevin I. Tzou

IPC: G11B5/596

CPC classification number: G11B19/04

Abstract: A disk drive has multiple feedforward controllers for handling external disturbances, such as rotational vibration (RV), that have different external disturbance frequency spectra. Each feedforward controller is designed to be optimal for a canceling a specific associated RV spectrum. The actual RV spectrum acting on the disk drive is determined and the proper feedforward controller is then selected and used to generate a compensation signal for canceling the RV. Each feedforward controller may be tested when the disk drive is experiencing the RV, and the resulting compensation signal and PES measured. The feedforward controller that produces the best external disturbance cancellation is then selected as the feedforward controller. A signal from a RV sensor may be used to detect the peak frequency of the actual RV spectrum. This detected peak frequency is then matched to a peak frequency in a plurality of peak frequencies in a lookup table, and the feedforward controller associated with the matching peak frequency is selected as the feedforward controller.

Abstract translation: 磁盘驱动器具有多个前馈控制器，用于处理具有不同外部干扰频谱的外部干扰，如旋转振动（RV）。 每个前馈控制器被设计为对于消除特定关联的RV频谱是最佳的。 确定作用在磁盘驱动器上的实际RV频谱，然后选择适当的前馈控制器以产生用于消除RV的补偿信号。 当磁盘驱动器经历RV时，可以测试每个前馈控制器，并测量所得到的补偿信号和PES。 然后选择产生最佳外部干扰消除的前馈控制器作为前馈控制器。 可以使用来自RV传感器的信号来检测实际RV频谱的峰值频率。 然后将该检测到的峰值频率与查找表中的多个峰值频率的峰值频率相匹配，并且选择与匹配峰值频率相关联的前馈控制器作为前馈控制器。

公开(公告)号：US20070217052A1

公开(公告)日：2007-09-20

申请号：US11378459

申请日：2006-03-17

Applicant: Tetsuo Semba ,  Matthew White ,  Kevin Tzou

Inventor： Tetsuo Semba ,  Matthew White ,  Kevin Tzou

IPC: G11B21/02 ,  G11B5/596

CPC classification number: G11B19/04

Abstract: A disk drive has multiple feedforward controllers for handling external disturbances, such as rotational vibration (RV), that have different external disturbance frequency spectra. Each feedforward controller is designed to be optimal for a canceling a specific associated RV spectrum. The actual RV spectrum acting on the disk drive is determined and the proper feedforward controller is then selected and used to generate a compensation signal for canceling the RV. Each feedforward controller may be tested when the disk drive is experiencing the RV, and the resulting compensation signal and PES measured. The feedforward controller that produces the best external disturbance cancellation is then selected as the feedforward controller. A signal from a RV sensor may be used to detect the peak frequency of the actual RV spectrum. This detected peak frequency is then matched to a peak frequency in a plurality of peak frequencies in a lookup table, and the feedforward controller associated with the matching peak frequency is selected as the feedforward controller.

Abstract translation: 磁盘驱动器具有多个前馈控制器，用于处理具有不同外部干扰频谱的外部干扰，如旋转振动（RV）。 每个前馈控制器被设计为对于消除特定关联的RV频谱是最佳的。 确定作用在磁盘驱动器上的实际RV频谱，然后选择适当的前馈控制器，并用于产生用于消除RV的补偿信号。 当磁盘驱动器经历RV时，可以测试每个前馈控制器，并测量所得到的补偿信号和PES。 然后选择产生最佳外部干扰消除的前馈控制器作为前馈控制器。 可以使用来自RV传感器的信号来检测实际RV频谱的峰值频率。 然后将该检测到的峰值频率与查找表中的多个峰值频率的峰值频率相匹配，并且选择与匹配峰值频率相关联的前馈控制器作为前馈控制器。

公开(公告)号：US07268968B2

公开(公告)日：2007-09-11

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: G11B5/596 ,  G11B21/02

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：US20070030768A1

公开(公告)日：2007-02-08

申请号：US11196874

申请日：2005-08-03

Applicant: Tetsuo Semba ,  Matthew White ,  Kevin Tzou

Inventor： Tetsuo Semba ,  Matthew White ,  Kevin Tzou

IPC: G11B5/596 ,  G11B21/10 ,  G11B7/00

CPC classification number: G11B5/5582

Abstract: 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.

Abstract translation: 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：US20060285256A1

公开(公告)日：2006-12-21

申请号：US11158445

申请日：2005-06-21

Applicant: Toshiki Hirano ,  Fu-Ying Huang ,  Tetsuo Semba ,  Matthew White

Inventor： Toshiki Hirano ,  Fu-Ying Huang ,  Tetsuo Semba ,  Matthew White

IPC: G11B5/56

CPC classification number: G11B5/5552

Abstract: 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.

Abstract translation: 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：US20060176599A1

公开(公告)日：2006-08-10

申请号：US11056965

申请日：2005-02-10

Applicant: Tetsuo Semba

Inventor： Tetsuo Semba

IPC: G11B5/09 ,  G11B21/02

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.

Abstract translation: 磁记录盘驱动器具有图案磁记录盘，其具有由非磁性区域分隔的可磁化材料的数据块，用于将写入脉冲定时到写入头的写时钟生成电路以及调整写入时序的旋转振动传感器 脉冲以纠正由磁盘驱动器的旋转干扰引起的错误。 写时钟生成电路接收与盘旋转同步的参考时钟信号，并将其相乘以产生较高频率的写入时钟信号。 写时钟生成电路包括：相位检测器，用于比较参考时钟信号和写入时钟信号的相位，并提供误差信号。 旋转振动传感器的输出与相位检测器误差信号相加，以补偿由旋转干扰引起的盘旋转速度变化。

公开(公告)号：US5936919A

公开(公告)日：1999-08-10

申请号：US803549

申请日：1997-02-20

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

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

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

CPC classification number: G11B7/08541 ,  G11B11/10563 ,  G11B11/10576 ,  G11B11/10597 ,  G11B7/0901

Abstract: 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.

公开(公告)号：US5323368A

公开(公告)日：1994-06-21

申请号：US977467

申请日：1992-11-17

Applicant: Tetsuo Semba

Inventor： Tetsuo Semba

IPC: G11B5/55 ,  G11B7/085 ,  G11B21/08 ,  G11B17/22

CPC classification number: G11B21/083 ,  G11B5/5547 ,  G11B7/08529

Abstract: To accomplish both fast track access and low power consumption in an apparatus for recording or reading out a signal onto or from a track of a recording medium. The actuator control apparatus uses a tracking error signal (TES), which is a signal whose level varies, with the time taken for a pickup to cross one track being used as a cycle. It detects the velocity of the pickup from the time interval (Ti) of the mean level crossing by TES, and provides an actuator with a signal having a pulse width (Tf) proportional to the time interval of the mean level crossing by TES, in synchronization with the crossing of the mean level by TES.

Abstract translation: 在用于在记录介质的轨道上记录或读出信号的设备中实现快速通道访问和低功耗的设备。 致动器控制装置使用跟踪误差信号（TES），该跟踪误差信号（TES）是其电平变化的信号，以及拾取器将一个轨道用作周期所需的时间。 它通过TES的平均电平的时间间隔（Ti）检测拾取器的速度，并且提供具有与TES的平均电平交叉的时间间隔成比例的脉冲宽度（Tf）的信号的致动器， 通过TES与平均水平的交叉同步。

公开(公告)号：US5317550A

公开(公告)日：1994-05-31

申请号：US7875

申请日：1993-01-22

Applicant: Tetsuo Semba

Inventor： Tetsuo Semba

IPC: G11B7/085 ,  G11B7/00

CPC classification number: G11B7/08529 ,  G11B7/08541

Abstract: A track access apparatus is provided by the present invention in which a reference drive signal 90 proportional to the reference acceleration of a beam spot 22 is generated according to the contents of a track counter 34. A signal 92 indicating the reference velocity of the beam spot 22 is generated by an integrator 40 in accordance with reference drive signal 90. A signal 82 indicating the position of an objective lens 20 relative to a coarse actuator 26, a signal 84 indicating a relative velocity, and a signal 94 indicating the difference between the actual velocity of beam spot 22 and a reference velocity are supplied to coarse actuator 26 and to a fine actuator 28. Reference drive signal 90 is supplied to coarse actuator 26. The present invention makes maximum use of the rapid acceleration and deceleration capability of the coarse actuator and moves the beam spot to a target track accurately at high speed. The present invention also controls the velocity of the beam spot relative to an optical recording medium by using a simple hardware structure.

Abstract translation: 根据本发明提供的轨道存取装置，其中根据轨道计数器34的内容产生与光束点22的基准加速度成比例的参考驱动信号90.一个指示光束点的参考速度的信号92 22根据参考驱动信号90由积分器40产生。指示物镜20相对于粗致动器26的位置的信号82，指示相对速度的信号84和指示物镜20之间的差异的信号94 光点22的实际速度和参考速度被提供给粗调致动器26和精细致动器28.参考驱动信号90被提供给粗致动器26.本发明最大限度地利用粗略的致动器26的快速加速和减速能力 执行器，并以高速准确地将光束点移动到目标轨道。 本发明还通过使用简单的硬件结构来控制光点相对于光记录介质的速度。