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21. 发明授权

US07768735B2 Angular and radial location determination in a control system 有权
标题翻译：控制系统中的角度和径向位置确定
公开(公告)号：US07768735B2
公开(公告)日：2010-08-03
申请号：US11846429
申请日：2007-08-28
申请人： Stanley H. Shepherd , Bruce Liikanen
发明人： Stanley H. Shepherd , Bruce Liikanen
IPC分类号： G11B21/02 , G11B5/09 , G11B5/596
CPC分类号： G11B5/59688 , G11B5/5526
摘要： In accordance with various embodiments, an angular location of a first servo field along an annular track is determined in relation to a difference between a first code value of the first servo field and a second code value of a second servo field along the track. A radial location of the track is obtained in relation to the determined angular location of the first servo field.
摘要翻译：根据各种实施例，沿着环形轨道的第一伺服磁场的角位置关于第一伺服磁场的第一代码值和沿着磁道的第二伺服磁场的第二代码值之间的差来确定。相对于所确定的第一伺服场的角位置获得轨道的径向位置。

22. 发明授权

US07474491B2 Adaptive write unsafe thresholds for self servo writing 有权
标题翻译：自适应写自适应写入的不安全阈值
公开(公告)号：US07474491B2
公开(公告)日：2009-01-06
申请号：US11637257
申请日：2006-12-11
申请人： Bruce Liikanen , Thomas O. Melrose
发明人： Bruce Liikanen , Thomas O. Melrose
IPC分类号： G11B21/12
CPC分类号： G11B19/04 , G11B5/59627 , G11B5/59666
摘要： An apparatus and associated method is provided for observing a positional misplacement of a control object at a first commanded position, defining a fault threshold as a function of the observed positional misplacement, and signaling a write unsafe command to the control object in relation to comparing an instantaneous positional misplacement of the control object to the defined fault threshold during self servo writing with the control object.
摘要翻译：提供了一种装置和相关联的方法，用于观察在第一命令位置处的控制对象的位置错位，定义作为观察到的位置错位的函数的故障阈值，并且向控制对象发信号通知写入不安全命令在与控制对象进行自伺服写入期间，控制对象瞬时位置偏移到定义的故障阈值。

23. 发明申请

US20080030894A1 SERVO WRITING WITH OFFSET COMPENSATION FOR PREWRITTEN REFERENCE 有权
标题翻译： SERVO写入偏移补偿用于PREWRITTEN参考
公开(公告)号：US20080030894A1
公开(公告)日：2008-02-07
申请号：US11740747
申请日：2007-04-26
申请人： YU SUN , Dave McMurtrey , Bruce Liikanen , Don Brunnett , John VanLaanen , Charles Watt , Stanley Shepherd , S. Smith , Todd Franks , Lin Guo
发明人： YU SUN , Dave McMurtrey , Bruce Liikanen , Don Brunnett , John VanLaanen , Charles Watt , Stanley Shepherd , S. Smith , Todd Franks , Lin Guo
IPC分类号： G11B17/08
CPC分类号： G11B25/043 , G11B5/59627 , G11B5/59661 , G11B5/59666
摘要： In accordance with various embodiments, a rotatable member is mounted to a spindle hub so that initial servo data previously provided to the rotatable member are eccentrically offset with respect to a rotational center of the spindle hub. Compensation vales are determined to characterize said offset, after which final servo data are provided to the rotatable member in relation to the initial servo data and the determined compensation values. The final servo data are nominally concentric with the rotational center of the spindle hub.
摘要翻译：根据各种实施例，可旋转构件安装到主轴毂，使得先前提供给可旋转构件的初始伺服数据相对于主轴毂的旋转中心偏心偏移。确定补偿值以表征所述偏移，之后相对于初始伺服数据和确定的补偿值将最终伺服数据提供给可旋转构件。最终伺服数据名义上与主轴毂的旋转中心同心。

24. 发明申请

US20070139809A1 Adaptive write unsafe thresholds for self servo writing 有权
标题翻译：自适应写自适应写入的不安全阈值
公开(公告)号：US20070139809A1
公开(公告)日：2007-06-21
申请号：US11637257
申请日：2006-12-11
申请人： Bruce Liikanen , Thomas Melrose
发明人： Bruce Liikanen , Thomas Melrose
IPC分类号： G11B21/02 , G11B15/04
CPC分类号： G11B19/04 , G11B5/59627 , G11B5/59666
摘要： An apparatus and associated method is provided for observing a positional misplacement of a control object at a first commanded position, defining a fault threshold as a function of the observed positional misplacement, and signaling a write unsafe command to the control object in relation to comparing an instantaneous positional misplacement of the control object to the defined fault threshold during self servo writing with the control object.
摘要翻译：提供了一种装置和相关联的方法，用于观察在第一命令位置处的控制对象的位置错位，定义作为观察到的位置错位的函数的故障阈值，并且向控制对象发信号通知写入不安全命令在与控制对象进行自伺服写入期间，控制对象瞬时位置偏移到定义的故障阈值。

25. 发明授权

US07233455B1 Method and apparatus for providing a temporary utility zone in a disk drive 有权
标题翻译：在磁盘驱动器中提供临时实用区域的方法和装置
公开(公告)号：US07233455B1
公开(公告)日：2007-06-19
申请号：US10859058
申请日：2004-06-02
申请人： David Rewerts , Bruce Liikanen , John VanLaanen
发明人： David Rewerts , Bruce Liikanen , John VanLaanen
IPC分类号： G11B21/02 , G11B5/09
CPC分类号： G11B5/59688 , G11B5/59661 , G11B5/59666
摘要： A disk surface has a keep-out region and a certified region. A transducer associated with the disk surface writes servo information in the keep-out region under control of a servo track writer. The transducer then writes data in a temporary utility zone in the keep-out region. Next, a self-servo write operation uses data in the temporary utility zone to write servo information in the certified region. Thereafter, data is transferred from the temporary utility zone to a final utility zone in the certified region.
摘要翻译：磁盘表面具有保留区域和认证区域。与磁盘表面相关联的传感器在伺服记录器的控制下将伺服信息写入保持区域。然后，换能器将数据写入保留区域中的临时实用区域。接下来，自伺服写入操作使用临时实用区中的数据在认证区域中写入伺服信息。此后，数据从临时实用区域转移到认证区域的最终实用区域。

26. 发明授权

US07230786B1 Method and apparatus for dynamic placement of an integration window in a disk drive having a disk surface with spiral servo information written thereon 有权
标题翻译：用于将集成窗口动态放置在具有写在其上的具有螺旋伺服信息的盘表面的磁盘驱动器中的方法和装置
公开(公告)号：US07230786B1
公开(公告)日：2007-06-12
申请号：US10858838
申请日：2004-06-02
申请人： Bill Ray , John VanLaanen , Bruce Liikanen
发明人： Bill Ray , John VanLaanen , Bruce Liikanen
IPC分类号： G11B21/02 , G11B5/596
CPC分类号： G11B5/59611 , G11B5/59661
摘要： The present invention is directed to a method and apparatus for dynamic placement of an integration window in a disk drive having a disk surface with spiral servo information written thereon. A read head is provided for reading the spiral servo information and generating a read signal envelope. A repetitive spiral position error, associated with one spiral of the spiral servo information, is measured. Placement of an integration window is dynamically adjusted based upon the measured repetitive spiral position error, so that a read signal envelope read by the read head appears more towards the center of the integration window than if the placement of the integration window was not dynamically adjusted. By adjusting the placement of the integration window, dynamic range is increased without increasing the size of the integration window.
摘要翻译：本发明涉及一种用于将集成窗口动态放置在具有写在其上的具有螺旋伺服信息的盘表面的磁盘驱动器中的方法和装置。提供读头以读取螺旋伺服信息并产生读信号包络。测量与螺旋伺服信息的一个螺旋相关联的重复螺旋位置误差。基于测量的重复螺旋位置误差来动态地调整积分窗口的放置，使得读积分头读取的读取信号包络比积分窗口的位置没有被动态调整时更多地朝向积分窗口的中心。通过调整积分窗口的位置，增加动态范围，而不增加积分窗口的大小。

27. 发明授权

US07154690B1 Dynamic shock detection in disk drive using accumulated average position error 失效
标题翻译：磁盘驱动器中的动态震动检测使用累积的平均位置误差
公开(公告)号：US07154690B1
公开(公告)日：2006-12-26
申请号：US11110097
申请日：2005-04-19
申请人： Don Brunnett , John Purkett , Bruce Liikanen
发明人： Don Brunnett , John Purkett , Bruce Liikanen
IPC分类号： G11B19/04
CPC分类号： G11B5/5582 , G11B5/596 , G11B19/04
摘要： Dynamically detecting off-track errors in a disk drive by adjusting transducer head position control parameters in response to shock events. In an embodiment, shock events with large magnitude trigger a severe shock timer which lengthens the write fault before write operations resume. In another embodiment, a lower shock threshold is used following an initial shock event. In yet another embodiment, a lower shock threshold is used if an accumulated average position error of the transducer head is large.
摘要翻译：通过根据冲击事件调整换能器头部位置控制参数来动态地检测磁盘驱动器中的偏离磁道错误。在一个实施例中，具有大幅度的冲击事件触发严重的冲击计时器，其在写入操作恢复之前延长写入故障。在另一个实施例中，在初始冲击事件之后使用较低的冲击阈值。在另一个实施例中，如果换能器头的累积的平均位置误差较大，则使用较低的冲击阈值。

28. 发明授权

US07136253B1 Method and apparatus for providing multi-point position demodulation of a read head when using spiral-written servo information 失效
标题翻译：当使用螺旋写入的伺服信息时，用于提供读取头的多点位置解调的方法和装置
公开(公告)号：US07136253B1
公开(公告)日：2006-11-14
申请号：US10858847
申请日：2004-06-02
申请人： Bruce Liikanen , John VanLaanen
发明人： Bruce Liikanen , John VanLaanen
IPC分类号： G11B5/596 , G11B21/02
CPC分类号： G11B5/59661 , G11B5/59688
摘要： The present invention is directed to a method and apparatus for providing multi-point position demodulation of a read head when using spiral-written servo information. In one embodiment, a disk surface has spiral servo information written thereon. A read head generates a read signal envelope when reading the spiral servo information. A read signal envelope is detected within an integration window and integration values are accumulated over the integration window. The accumulated integration values are multiplied by a first number associated with a first integrator value and a second number associated with a second integrator value. A first position error signal associated with the first integrator value is determined, and a second position error signal associated with the second integrator value is also determined. A final position error signal is determined using the first position error signal and the second position error signal.
摘要翻译：本发明涉及一种在使用螺旋写入的伺服信息时提供读取头的多点位置解调的方法和装置。在一个实施例中，盘表面上写有螺旋伺服信息。当读取螺旋伺服信息时，读取头产生读取信号包络。在积分窗口内检测到读信号包络，积分值积累在积分窗口上。累积积分值乘以与第一积分器值相关联的第一数字和与第二积分器值相关联的第二数字。确定与第一积分器值相关联的第一位置误差信号，并且还确定与第二积分器值相关联的第二位置误差信号。使用第一位置误差信号和第二位置误差信号来确定最终位置误差信号。

29. 发明授权

US06985316B1 Method and apparatus for performing seek operations in a disk drive having a disk surface with spiral servo information written thereon 失效
标题翻译：在具有写在其上的螺旋伺服信息的盘表面的盘驱动器中进行寻道操作的方法和装置
公开(公告)号：US06985316B1
公开(公告)日：2006-01-10
申请号：US10858830
申请日：2004-06-02
申请人： Bruce Liikanen , John VanLaanen , Bill Ray
发明人： Bruce Liikanen , John VanLaanen , Bill Ray
IPC分类号： G11B20/06 , G11B15/18
CPC分类号： G11B5/59627
摘要： The present invention is directed to a method and apparatus for performing seek operations in a disk drive having a disk surface with spiral servo information written thereon. In one embodiment, a disk surface is provided with a read head associated therewith. The disk surface has spiral servo information written thereon. The read head generates a read signal envelope when reading the spiral servo information. A plurality of integration windows is provided. The plurality of integration windows have a standard interval therebetween. A position error signal is generated based upon a location of a read signal envelope within an integration window. The interval between adjacent integration windows is adjusted from the standard interval to generate a position error signal. The read head is moved in a radial direction based upon the position error signal. This process may be repeated to seek across the disk surface.
摘要翻译：本发明涉及一种用于在具有写在其上的螺旋伺服信息的盘表面的盘驱动器中执行寻道操作的方法和装置。在一个实施例中，盘表面设置有与其相关联的读取头。盘面上写有螺旋伺服信息。当读取螺旋伺服信息时，读取头产生读取信号包络。提供多个集成窗口。多个集成窗口之间具有标准间隔。基于集成窗口内的读信号包络的位置产生位置误差信号。从标准间隔调整相邻积分窗口之间的间隔，以产生位置误差信号。基于位置误差信号，读取头沿径向方向移动。可以重复该过程以在盘表面上寻找。

30. 发明授权

US06600636B1 Magnetic head with write element offset from read element 有权
标题翻译：磁头与写入元件偏离读取元件
公开(公告)号：US06600636B1
公开(公告)日：2003-07-29
申请号：US09416135
申请日：1999-10-12
申请人： Bruce Liikanen , Terry Schemmel , Jenny Himle
发明人： Bruce Liikanen , Terry Schemmel , Jenny Himle
IPC分类号： G11B5127
CPC分类号： G11B5/3903 , G11B5/012 , G11B5/02 , G11B5/127 , G11B5/2654 , G11B5/332 , G11B5/3967 , G11B5/4886 , G11B5/59683
摘要： A computer disk drive transducer head having spatially separated read and write heads is provided. The transducer head reduces or eliminates servo errors during write operations by positioning the read head of the transducer away from the write head. This spatial separation prevents the disruption of magnetic domains in the read head, and in particular in the magnetoresistive element and the shields in the immediate vicinity of the magnetoresistive element. The present invention further provides a method for reducing servo errors during write operations by spatially separating the read and write heads by a distance sufficient to limit the strength of a magnetic field produced in the read head during a write operation to no greater than the strength of a magnetic field produced in the read head by the magnetic disk.
摘要翻译：提供具有空间分离的读写头的计算机磁盘驱动器换能器头。换能器头通过将换能器的读头放置在远离写入头的位置来减少或消除写入操作期间的伺服误差。这种空间分离防止读磁头中的磁畴的破坏，特别是磁阻元件和磁阻元件紧邻附近的屏蔽。本发明还提供了一种用于通过将读写头空间分开一定距离的方式来减少写入操作期间的伺服误差的方法，该距离足以将写入操作期间在读头中产生的磁场的强度限制在不大于通过磁盘在读取头中产生的磁场。

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