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1. 发明授权

US06377418B1 Digital filter, servo control unit, and disk drive 有权
标题翻译：数字滤波器，伺服控制单元和磁盘驱动器
公开(公告)号：US06377418B1
公开(公告)日：2002-04-23
申请号：US09148846
申请日：1998-09-03
申请人： Naoyuki Kagami , Akira Tokizono , Hien Dang , Arun Sharma , Sri M. Sri-Jayantha
发明人： Naoyuki Kagami , Akira Tokizono , Hien Dang , Arun Sharma , Sri M. Sri-Jayantha
IPC分类号： G11B5596
CPC分类号： H03H17/04 , G11B5/59622 , G11B21/085 , H03H17/0294
摘要： The present invention provides a digital filter which is capable of preventing filter outputs from being discontinuous when a filter characteristic is changed. Initially, a servo assistant (SA) computes parameters for computing servo data, and based on the computed parameters, the SA judges an operating mode. If the mode has been changed, the SA will advance in processing. Next, the parameters of a filter are changed in correspondence with the judged operating mode, and the initial values of the interior variables of the filter are set to appropriate values.
摘要翻译：本发明提供一种数字滤波器，当滤波器特性改变时，能够防止滤波器输出不连续。最初，伺服助理（SA）计算用于计算伺服数据的参数，并且基于所计算的参数，SA判断操作模式。如果模式发生变化，SA将进行处理。接下来，根据判断的操作模式改变滤波器的参数，并将滤波器的内部变量的初始值设置为适当的值。

2. 发明授权

US06567230B1 Method and system for performing positioning control of a head actuator in a disk device utilizing a digital filter 失效
标题翻译：用于利用数字滤波器执行磁盘装置中的磁头致动器的定位控制的方法和系统
公开(公告)号：US06567230B1
公开(公告)日：2003-05-20
申请号：US09429696
申请日：1999-10-28
申请人： Naoyuki Kagami , Akira Tokizono , Sri M. Sri-Jayantha , Tatsuya Sakai , Isao Yoneda , Hien Phu Dang , Arun Sharma
发明人： Naoyuki Kagami , Akira Tokizono , Sri M. Sri-Jayantha , Tatsuya Sakai , Isao Yoneda , Hien Phu Dang , Arun Sharma
IPC分类号： G11B2102
CPC分类号： H03H17/0294 , G11B5/5521 , G11B5/56
摘要： A method and system for utilizing a digital filter for actuator positioning control in a disk device. In accordance with the method and system of the present invention multiple selectable filter modules are provided. Each of the multiple selectable filter modules functions in a serial or parallel filtering mode when selected. Multiple configurable registers are also provided wherein the configuration of each of the multiple configurable registers determines a selection of at least one of the multiple selectable filter modules. Particular ones of the multiple configurable registers are selected, such that a configuration of the digital filter is dynamically selectable in order to achieve a predetermined filter output.
摘要翻译：一种利用数字滤波器在盘装置中执行器定位控制的方法和系统。根据本发明的方法和系统，提供了多个可选择的过滤器模块。多个可选滤波器模块中的每一个在选择时以串行或并行滤波模式运行。还提供了多个可配置寄存器，其中多个可配置寄存器中的每一个的配置确定多个可选择滤波器模块中的至少一个的选择。选择多个可配置寄存器中的特定的寄存器，使得可以动态地选择数字滤波器的配置以便实现预定的滤波器输出。

3. 发明授权

US06549349B2 Adaptive vibration control for servo systems in data storage devices 失效
标题翻译：数据存储设备伺服系统的自适应振动控制
公开(公告)号：US06549349B2
公开(公告)日：2003-04-15
申请号：US09955391
申请日：2001-09-18
申请人： Sri Muthuthamby Sri-Jayantha , Arun Sharma , Hien Phu Dang , Naoyuki Kagami , Yuzo Nakagawa , Akira Tokizono , Isao Yoneda
发明人： Sri Muthuthamby Sri-Jayantha , Arun Sharma , Hien Phu Dang , Naoyuki Kagami , Yuzo Nakagawa , Akira Tokizono , Isao Yoneda
IPC分类号： G11B2736
CPC分类号： G11B21/106 , G11B5/59611
摘要： Methods and systems for detecting and correcting for undesirable vibrations impacting the servo systems in data storage devices. A detection technique is provided wherein a detection filter is configured to scan a position signal of the servo system across a range of frequencies, and, at each respective scanned frequency, record an amplitude associated therewith. The recorded amplitudes are examined to determine whether any exceed a threshold, thereby locating a peak frequency of the vibration. Using the detected peak frequency of the vibration, a corrective filter is configured to operate about the peak frequency of vibration, thereby reducing its impact on the position signal in the servo system. Optimum detection and correction filter structures are disclosed, as are techniques for addressing filter state vectors as initial conditions as the corrective filters are repeatedly engaged during successive settle-out and track follow cycles (between seeks), as are continuous adaptation techniques for changing vibration environments.
摘要翻译：用于检测和校正影响数据存储设备中的伺服系统的不期望的振动的方法和系统。提供了一种检测技术，其中检测滤波器被配置为扫描频率范围内的伺服系统的位置信号，并且在每个相应的扫描频率处记录与之相关联的振幅。检查记录的振幅以确定是否有超过阈值，从而定位振动的峰值频率。使用检测到的振动峰值频率，校正滤波器被配置为围绕振动的峰值频率运行，从而减小其对伺服系统中位置信号的影响。公开了最佳检测和校正滤波器结构，作为用于将滤波器状态向量寻址作为初始条件的技术，校正滤波器在连续的稳定和跟踪周期（寻找之间）期间重复接合），以及用于改变振动环境的连续自适应技术。

4. 发明授权

US06529344B1 Method and system for compensating a head positioning servo in a storage device 失效
标题翻译：用于补偿存储装置中的头部定位伺服的方法和系统
公开(公告)号：US06529344B1
公开(公告)日：2003-03-04
申请号：US09426425
申请日：1999-10-25
申请人： Naoyuki Kagami , Akira Tokizono
发明人： Naoyuki Kagami , Akira Tokizono
IPC分类号： G11B5596
CPC分类号： G11B5/59605
摘要： A method and system for compensating head positioning servo in a storage device. In accordance with the method and apparatus of the present invention, an open-loop gain of a head positioning servo is calculated when the head positioning servo causes a head to follow a predetermined position of a target track of a storage media surface by generating a position detecting signal utilizing a position detecting signal gain. A compensated position detecting signal gain is generated by compensating the position detecting signal gain according to a difference between a first predetermined value and the open-loop gain of the head positioning servo, such that variability of the position detecting signal and the open-loop gain is reduced to achieve stability in a head positioning servo.
摘要翻译：一种用于补偿存储装置中的头部定位伺服的方法和系统。根据本发明的方法和装置，当磁头定位伺服机构通过产生一个位置使磁头跟随存储介质表面的目标磁道的预定位置时，计算磁头定位伺服的开环增益利用位置检测信号增益来检测信号。通过根据第一预定值和头定位伺服的开环增益之间的差补偿位置检测信号增益来产生补偿位置检测信号增益，使得位置检测信号和开环增益的变化减少了在头部定位伺服中的稳定性。

5. 发明授权

US06219196B1 Method and apparatus for suppressing mechanical resonance in a disk drive storage device using a notch filter 失效
标题翻译：使用陷波滤波器来抑制磁盘驱动器存储装置中的机械共振的方法和装置
公开(公告)号：US06219196B1
公开(公告)日：2001-04-17
申请号：US09153199
申请日：1998-09-14
申请人： Tetsuo Semba , Naoyuki Kagami , Akira Tokizono
发明人： Tetsuo Semba , Naoyuki Kagami , Akira Tokizono
IPC分类号： G11B2102
CPC分类号： G11B5/596
摘要： The present invention teaches the realization of a stable feedback control by selecting an optimal notch filter in an apparatus, such as a hard disk drive, that employs a positioning apparatus, such as an actuator, for positioning an object. The present invention further teaches the derivation of a frequency characteristic of a control loop excluding a notch filter by employing a method that does not damage a positioning apparatus. The present invention further teaches the method of adjusting a notch filter in accordance with a change of the resonant frequency of an actuator caused by the temperature fluctuations to prevent any deterioration of a feedback control performance.
摘要翻译：本发明教导了通过在诸如硬盘驱动器的装置中选择最佳陷波滤波器来实现稳定的反馈控制，该设备采用诸如致动器的定位装置来定位物体。本发明还通过采用不损坏定位装置的方法来教导除了陷波滤波器之外的控制回路的频率特性的推导。本发明进一步教导了根据由温度波动引起的致动器的谐振频率的变化来调整陷波滤波器的方法，以防止反馈控制性能的任何劣化。

6. 发明授权

US06218794B1 Spindle motor startup method and apparatus 有权
标题翻译：主轴电机启动方法和装置
公开(公告)号：US06218794B1
公开(公告)日：2001-04-17
申请号：US09429529
申请日：1999-10-28
申请人： Yasuhito Shimizu , Naoyuki Kagami , Akira Tokizono , Akihiro Ohyama
发明人： Yasuhito Shimizu , Naoyuki Kagami , Akira Tokizono , Akihiro Ohyama
IPC分类号： H02P118
CPC分类号： H02P6/20
摘要： A spindle motor start up method wherein a torque balance between the stator and rotor is broken so as to avoid startup malfunctions, and thereby improve motor startup time in spindle motors prone to startup malfunctions, such as hard disk drive motors having a 4:3 ratio of the number of rotor magnetic poles to the number of stator slots. Processes for breaking a torque balance according to the present invention include: (1) gradually decreasing an initial commutation (switching of each phase) frequency at the startup timing from a frequency higher than a commutation frequency in a conventional startup; (2) gradually decreasing an initial commutation frequency at the startup timing from a frequency higher than a commutation frequency in a conventional startup to a low frequency, and next, gradually increasing the initial frequency from the low frequency; (3) changing a drive current of the spindle motor so as to break a torque balance between the spindle motor stator and rotor; (4) monitoring a back electromotive force detection signal while commutating, and restarting commutation when the back electromotive force detection signal is not detected; and (5) monitoring a back electromotive force detection signal while commutating, resetting the commutation at a time in a commutation sequence after an initial commutation from a first phase to a second phase, and restarting the commutation from the first phase to the second phase.
摘要翻译：一种主轴电动机起动方法，其中定子和转子之间的转矩平衡被破坏以避免起动故障，从而提高容易发生起动故障的主轴电动机中的电动机启动时间，例如具有4:3比例的硬盘驱动电动机的转子磁极的数量与定子槽的数量。根据本发明的用于断开扭矩平衡的处理包括：（1）在常规启动中，从起始频率高于换向频率的频率逐渐减小启动时刻的初始换向（每相切换）频率; （2）从常规启动中的高于换流频率的频率开始到启动定时的初始换向频率逐渐降低到低频，接着从低频逐渐增加初始频率; （3）改变主轴电动机的驱动电流，以断开主轴电动机定子和转子之间的转矩平衡; （4）在整流时监视反电动势检测信号，并且在未检测到反电动势检测信号时重新开始换向; 以及（5）在整流时监视反电动势检测信号，在从第一相到第二相的初始换向之后，在换向序列中的一次复位，并且重新开始从第一相到第二相的换向。

7. 发明授权

US5872677A Magnetic head position detecting method and magnetic disk apparatus 失效
标题翻译：磁头位置检测方法和磁盘装置
公开(公告)号：US5872677A
公开(公告)日：1999-02-16
申请号：US735689
申请日：1996-10-23
申请人： Naoyuki Kagami , Akira Tokizono , Yuzo Nakagawa
发明人： Naoyuki Kagami , Akira Tokizono , Yuzo Nakagawa
IPC分类号： G11B5/596
CPC分类号： G11B5/596
摘要： A magnetic head position detecting method is provided in which a first and a second position detection signal representative of a particular position of a magnetic head with respect to a magnetic disk is obtained. The first and the second position detection signal preferably is obtained by utilizing a burst pattern formed on the magnetic disk. Subsequently, a third position detection signal is generated by multiplying the first and the second position detection signals by a predetermined gain so that the third position detection signal changes linearly. The particular position of the magnetic head is detected by using the third position detection signal. In addition, a magnetic disk apparatus implementing the magnetic head position detecting method is provided.
摘要翻译：提供一种磁头位置检测方法，其中获得表示磁头相对于磁盘的特定位置的第一和第二位置检测信号。优选地，通过利用形成在磁盘上的脉冲串图形来获得第一和第二位置检测信号。随后，通过将第一和第二位置检测信号乘以预定的增益使得第三位置检测信号线性地变化来产生第三位置检测信号。通过使用第三位置检测信号来检测磁头的特定位置。另外，提供了实现磁头位置检测方法的磁盘装置。

8. 发明授权

US07035034B2 Data storage device, control device, off-track control method, and control method 失效
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.

9. 发明授权

US07019921B2 Control method and apparatus for reducing the effects of hard disk contamination 失效
标题翻译：减少硬盘污染影响的控制方法和装置
公开(公告)号：US07019921B2
公开(公告)日：2006-03-28
申请号：US10753601
申请日：2004-01-08
申请人： Naoyuki Kagami , Masayuki Kanamaru , Shunichiroh Ohta , Akira Tokizono , Toshihiko Tsunokawa
发明人： Naoyuki Kagami , Masayuki Kanamaru , Shunichiroh Ohta , Akira Tokizono , Toshihiko Tsunokawa
IPC分类号： G11B27/36 , G11B21/02
CPC分类号： G11B5/012 , G11B5/41 , G11B5/54 , G11B21/22 , G11B33/14 , G11B33/1446
摘要： A method and apparatus for use with a rotating storage device. The rotating storage device includes a storage medium driven to rotate, a head for reading and writing information on the storage medium and a ramped loading mechanism in which the head is stored. In accordance with the method of the present invention, the head is loaded from the ramped loading mechanism onto the storage medium. Next, determining whether or not a write operation on said storage medium is performed within a predetermined amount of time after loading said head on said storage medium and in response to said determination, setting a verification flag to indicate a data verification is required immediately after said write operation.
摘要翻译：一种与旋转存储装置一起使用的方法和装置。旋转存储装置包括被驱动旋转的存储介质，用于在存储介质上读取和写入信息的磁头以及其中存储磁头的倾斜加载机构。根据本发明的方法，将头从斜坡加载机构装载到存储介质上。接下来，在将所述头装载到所述存储介质上之后，根据所述确定确定在所述存储介质上的写入操作是否在预定的时间内执行，并且在所述确定之后立即需要设置用于指示数据验证的验证标志写操作。

10. 发明授权

US06690537B2 Method and system for controlling the positioning of a read/write head of a data recording device 失效
标题翻译：用于控制数据记录装置的读/写头定位的方法和系统
公开(公告)号：US06690537B2
公开(公告)日：2004-02-10
申请号：US09904597
申请日：2001-07-13
申请人： Naoyuki Kagami , Akira Tokizono , Hiroshi Uchida
发明人： Naoyuki Kagami , Akira Tokizono , Hiroshi Uchida
IPC分类号： G11B5596
CPC分类号： G11B21/083 , G11B5/5526
摘要： A read/write head servo control system for data recording devices, wherein a method of compensating initial values is utilized to generate a control signal to move the head from an initial position to a target position. The method estimates and stores multiple position compensation values. A first control signal moves the head from an initial position to a target position. Head position values are sampled as the head moves. Head position deviation values are calculated for the sampled position values. The head position values are utilized to select a set of estimated position compensation values. These values are in turn utilized to generate a second control signal, which is then utilized to control the position of the head.
摘要翻译：一种用于数据记录装置的读/写头伺服控制系统，其中利用补偿初始值的方法来产生控制信号，以将头从初始位置移动到目标位置。该方法估计并存储多个位置补偿值。第一控制信号将头从初始位置移动到目标位置。头位置值被采样。针对采样的位置值计算头位置偏差值。头位置值用于选择一组估计位置补偿值。这些值又用于产生第二控制信号，然后利用该信号来控制头部的位置。

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