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1. 发明授权

US5923502A Magneto-resistive head including a selectively placed low-reluctance path between shields 失效
标题翻译：磁阻头包括在屏蔽之间的选择性放置的低磁阻路径
公开(公告)号：US5923502A
公开(公告)日：1999-07-13
申请号：US576496
申请日：1995-12-21
申请人： Thomas Charles Christensen , Jodie Ann Christner , Earl Albert Cunningham , Jay Michael Mosbrucker
发明人： Thomas Charles Christensen , Jodie Ann Christner , Earl Albert Cunningham , Jay Michael Mosbrucker
IPC分类号： G11B5/11 , G11B5/31 , G11B5/39 , G11B5/48 , G11B23/00 , G11B5/008
CPC分类号： G11B5/3903 , G11B5/11 , G11B23/0007 , G11B5/3143 , G11B5/4806
摘要： A magnetic head including a shielded MR element which incorporates a low reluctance path between the shields to reduce interference picked up by inductive reading of the shields. The low reluctance path is provided outside a conductive loop of material which includes the MR element and its associated leads. The low reluctance path may include a magnetic short between the two shields.
摘要翻译：包括屏蔽MR元件的磁头，其在屏蔽之间包含低磁阻路径，以减少通过屏蔽的感应读数拾取的干扰。低磁阻路径设置在包括MR元件及其相关引线的材料的导电回路外部。低磁阻路径可以包括两个屏蔽之间的磁短路。

2. 发明授权

US5859739A Magnetic data reading apparatus and method using inductive and magnetoresistive heads 失效
标题翻译：磁数据读取装置及使用感应磁阻头的方法
公开(公告)号：US5859739A
公开(公告)日：1999-01-12
申请号：US640530
申请日：1996-05-01
申请人： Earl Albert Cunningham , Jodie Ann Christner
发明人： Earl Albert Cunningham , Jodie Ann Christner
IPC分类号： G11B5/39 , G11B5/00 , G11B5/012 , G11B5/02 , G11B5/035 , G11B5/55 , G11B5/596 , G11B19/04
CPC分类号： G11B5/5547 , G11B19/04 , G11B5/00 , G11B5/012 , G11B5/02 , G11B5/5526 , G11B5/59683 , G11B2005/0013 , G11B2005/0016 , G11B5/035
摘要： A rigid disk drive unit includes head assemblies having both inductive and magnetoresistive heads. When information is read from a disk surface, signals from the inductive head and the magnetoresistive head are combined to provide an output signal, thereby to overcome disadvantages of using either signal alone. The relative contributions of the magnetoresistive and inductive signals are varied to optimize performance depending on the radial position of the head assembly over a magnetic disk and upon whether the information being read is data or servo position information. The inductive signal is ignored during data recovery procedure head shift operations.
摘要翻译：刚性盘驱动单元包括具有感应磁头和磁阻头的磁头组件。当从盘表面读取信息时，来自感应头和磁阻头的信号被组合以提供输出信号，从而克服单独使用任一信号的缺点。根据磁头组件在磁盘上的径向位置以及被读取的信息是数据还是伺服位置信息，磁阻和感应信号的相对贡献被改变以优化性能。在数据恢复过程头移动操作期间，感应信号被忽略。

3. 发明授权

US5748415A Magnetoresistive head with a magnetoresistive film shaped to provide an improved read sensitivity profile 失效
标题翻译：具有磁阻膜的磁阻头，其形状提供改进的读取灵敏度分布
公开(公告)号：US5748415A
公开(公告)日：1998-05-05
申请号：US739240
申请日：1996-10-29
申请人： Jodie Ann Christner , Earl Albert Cunningham
发明人： Jodie Ann Christner , Earl Albert Cunningham
IPC分类号： G11B5/39 , G11B5/127
CPC分类号： G11B5/398
摘要： A magnetoresistive (MR) head includes an MR film that has a bottom edge to be positioned adjacent to a magnetic medium, a first side with a first outside edge, and a second side with a second outside edge. The first outside edge extends in a direction that forms an obtuse angle with the bottom edge. A first lead layer is electrically connected to the magnetoresistive film at the first outside edge, and a second lead layer is electrically connected to the magnetoresistive film at the second outside edge. Because of the orientation of the first outside edge of the MR film, magnetic flux from the magnetic medium is more likely to propagate through the MR film without being impeded by the first outside edge, and thus the read sensitivity profile of the MR head is improved. In a preferred embodiment, the first and the second outside edges of the MR film both include a lower portion substantially perpendicular to the bottom edge and an upper portion extending in a direction that forms an obtuse angle with the bottom edge. This minimizes variation in the width of the MR film due to lapping height tolerance because the lower portions of the first and second outside edges are parallel to one another. In another preferred embodiment, the height of the MR film narrows from the second outside edge to the first outside edge. This further improves the read sensitivity profile of the MR head.
摘要翻译：磁阻（MR）头包括MR膜，其具有邻近磁介质定位的底边缘，具有第一外边缘的第一侧和具有第二外边缘的第二侧。第一外边缘沿与底边形成钝角的方向延伸。第一引线层在第一外部边缘处电连接到磁阻膜，并且第二引线层在第二外部边缘处电连接到磁阻膜。由于MR膜的第一外边缘的取向，来自磁介质的磁通更可能通过MR膜传播而不受第一外边缘的阻碍，因此改善了MR头的读灵敏度分布。在优选实施例中，MR膜的第一和第二外边缘都包括基本上垂直于底部边缘的下部和在与底部边缘形成钝角的方向上延伸的上部。由于第一和第二外边缘的下部彼此平行，因此由于研磨高度公差，这使得MR膜的宽度的变化最小化。在另一个优选实施例中，MR膜的高度从第二外边缘变窄到第一外边缘。这进一步提高了MR磁头的读取灵敏度分布。

4. 发明授权

US6014277A Multipath channel apparatus and method using offset parameters to compensate for amplitude and timing errors in data storage devices 失效
标题翻译：多路径信道装置和方法，使用偏移参数来补偿数据存储设备中的幅度和定时误差
公开(公告)号：US6014277A
公开(公告)日：2000-01-11
申请号：US647088
申请日：1996-05-08
申请人： Thomas Charles Christensen , Earl Albert Cunningham
发明人： Thomas Charles Christensen , Earl Albert Cunningham
IPC分类号： G06F13/00 , G11B20/10 , G11B20/18 , G11B5/09
CPC分类号： G11B20/10009 , G11B20/1833 , G11B2020/183
摘要： A multipath channel apparatus for a data storage device wherein data is stored on a storage medium and is read from the storage medium by a transducer or for a data communications system wherein data is transmitted to a receiver. A data channel having a plurality of data paths is operatively connected to the transducer to receive data read from the storage medium by the transducer, or operatively connected to receive data demodulated by the receiver or base band data received by the receiver. Preferably, each of the data paths has a differing parameter value. An error checking unit checks customer and redundancy data from each of the data paths. A selecting unit, which is responsive to the error checking unit, selects data from one of the data paths. In a preferred embodiment, the data stored on a storage medium includes a data field and an error correcting code field, and the customer and redundancy data from each of the data paths is checked using a calculated error correcting code sydrome.
摘要翻译：一种用于数据存储装置的多路径通道装置，其中数据被存储在存储介质上，并且由换能器或数据通信系统从存储介质读取，其中数据被发送到接收器。具有多个数据路径的数据通道可操作地连接到换能器，以接收由换能器从存储介质读取的数据，或可操作地连接以接收由接收器接收的接收器或基带数据解调的数据。优选地，每个数据路径具有不同的参数值。错误检查单元从每个数据路径检查客户和冗余数据。响应于错误检查单元的选择单元从数据路径之一中选择数据。在优选实施例中，存储在存储介质上的数据包括数据字段和纠错码字段，并且使用计算出的纠错码信息来检查来自每个数据路径的客户和冗余数据。

5. 发明授权

US5831786A Disk drive having position sensor for ramp load and unload, and method for its use 失效
标题翻译：具有用于斜坡加载和卸载的位置传感器的磁盘驱动器及其使用方法
公开(公告)号：US5831786A
公开(公告)日：1998-11-03
申请号：US922115
申请日：1997-08-28
申请人： Zine-Eddine Boutaghou , Earl Albert Cunningham , Hal Hjalmar Ottesen
发明人： Zine-Eddine Boutaghou , Earl Albert Cunningham , Hal Hjalmar Ottesen
IPC分类号： G11B21/12 , G11B5/54 , G11B21/02 , G11B21/22
CPC分类号： G11B21/12 , G11B21/02 , G11B21/22 , G11B5/54
摘要： Disclosed is a disk drive having at least one disk for storing data. The disk drive includes at least one transducer for reading or writing data to or from the disk. The transducer is attached to an actuator which positions the transducer with respect to the disk. The actuator includes a controllable motor which is used to move the actuator and the transducer attached thereto. The disk drive also includes a ramp for off loading the transducer or for parking the transducer off of the surface of the disk. Also disclosed is apparatus and methods for measuring and controlling the movement of the actuator and attached transducer while the transducer is coming from a position off of the ramp and onto the surface of the disk.
摘要翻译：公开了一种具有至少一个用于存储数据的盘的磁盘驱动器。磁盘驱动器包括至少一个读取或写入数据到磁盘的传感器。传感器连接到将换能器相对于盘定位的致动器。致动器包括可控马达，其用于移动致动器和连接到其上的换能器。磁盘驱动器还包括用于卸载换能器或将换能器从盘的表面停放的斜坡。还公开了一种装置和方法，用于测量和控制致动器和连接的换能器的运动，同时换能器来自斜坡的位置并且到达盘的表面。

6. 发明授权

US6002540A Method and apparatus for rotary actuator arc compensation correction in a direct access storage device 失效
标题翻译：直接存取存储装置中的旋转执行器电弧补偿校正方法和装置
公开(公告)号：US6002540A
公开(公告)日：1999-12-14
申请号：US87825
申请日：1998-05-29
申请人： Earl Albert Cunningham , Kevin Jack Erickson , Hal Hjalmar Ottesen
发明人： Earl Albert Cunningham , Kevin Jack Erickson , Hal Hjalmar Ottesen
IPC分类号： G11B5/596 , G11B21/10
CPC分类号： G11B5/59644 , G11B21/106 , G11B5/59605 , G11B5/59655 , G11B5/59688
摘要： Rotary actuator arc compensation correction method and apparatus are provided for a direct access storage device (DASD). A reference feedforward correction signal is generated at each of a plurality of sectors around a predetermined track on a disk surface. A specific selected track is identified, and both magnitude and phase of the generated reference feedforward correction signal are modified to correct for the arced trajectory caused by the rotary actuator at the specific selected track. Improved actuator servo control is provided by using pseudo sector compensation to interpolate the feedforward correction signal between servo sectors.
摘要翻译：为直接存取存储设备（DASD）提供旋转执行器电弧补偿校正方法和装置。在盘表面上的预定轨道周围的多个扇区中的每一个处产生参考前馈校正信号。识别特定的所选轨道，并且修改所生成的参考前馈校正信号的幅度和相位，以校正由特定所选轨道处的旋转致动器引起的弧形轨迹。通过使用伪扇区补偿来在伺服扇区之间内插前馈校正信号来提供改进的致动器伺服控制。

7. 发明授权

US5920441A Method and apparatus for controlling a multiple-stage actuator for a disk drive 失效
公开(公告)号：US5920441A
公开(公告)日：1999-07-06
申请号：US532340
申请日：1995-09-22
申请人： Earl Albert Cunningham , Long-Sheng Fan , Hal Hjalmar Ottesen , Timothy Clark Reiley
发明人： Earl Albert Cunningham , Long-Sheng Fan , Hal Hjalmar Ottesen , Timothy Clark Reiley
IPC分类号： G11B5/55 , G11B5/596 , G11B7/085 , G11B7/09 , G11B21/08
CPC分类号： G11B7/0901 , G11B21/085 , G11B5/5552 , G11B5/5556 , G11B5/59605 , G11B5/59627 , G11B7/08505 , G11B7/08576 , G11B7/0937 , G11B7/0945
摘要： A method and apparatus for controlling a multiple-stage actuator for a disk drive which does not require an additional sensor for measuring the relative position between adjacent actuator stages. In a two-stage actuator system, a position-type secondary actuator (SA) rides piggyback on a primary actuator (PA). The repeatable runout is measured and used as a feedforward signal to the PA. If the PA is a rotary actuator, the feedforward signal is preferably arc corrected for the arc that the head transverses from the inner radius to the outer radius of the disk. Added to the feedforward signal is the moving average of the drive signal applied to the SA. Because the SA is of the position-type having a neutral position, this moving average is proportional to the time cumulative drift present in the two-stage actuator system, and forces the PA in a direction that minimizes deviation of the SA from its neutral position. This minimizes the range requirement for the SA, the main purpose of which is to reduce non-repeatable runout.

8. 发明授权

US5783981A Magnetic reinitialization of thin film magnetoresistive reproducing heads at the suspension level of media drive manufacturing 失效
标题翻译：在介质驱动器制造的悬挂级别的薄膜磁阻再现磁头的磁性重新初始化
公开(公告)号：US5783981A
公开(公告)日：1998-07-21
申请号：US462348
申请日：1995-06-05
申请人： Samir Elias Abboud , Nickolas Christopher Apuzzo , Jeffrey Bernard Brown , Earl Albert Cunningham , David Malcolm Hannon , Raymond Patrick Mallette , Paul Sheldon Tyler , Steven Harry Voss , Albert John Wallash
发明人： Samir Elias Abboud , Nickolas Christopher Apuzzo , Jeffrey Bernard Brown , Earl Albert Cunningham , David Malcolm Hannon , Raymond Patrick Mallette , Paul Sheldon Tyler , Steven Harry Voss , Albert John Wallash
IPC分类号： G11B5/00 , G11B5/39 , G11B5/465 , G11B5/48 , H01L43/12 , H01F7/20
CPC分类号： G11B5/3903 , G11B5/465 , G11B5/4886 , G11B2005/0008 , Y10T29/49034
摘要： The magnetic states of MR reproducing heads are reinitialized during media drive manufacturing by applying initializing magnetic fields to the transducers after they have been manufactured and incorporated into media drive assemblies.
摘要翻译：磁记录磁头的磁状态在介质驱动制造过程中被重新初始化，通过在传感器被制造并被并入介质驱动组件之后将其初始化磁场。

9. 发明授权

US5664319A Magnetic reinitialization of thin film magnetoresistive reproducing heads at the suspension level of media drive manufacturing 失效
公开(公告)号：US5664319A
公开(公告)日：1997-09-09
申请号：US471505
申请日：1995-06-06
申请人： Samir Elias Abboud , Nickolas Christopher Apuzzo , Jeffrey Bernard Brown , Earl Albert Cunningham , David Malcolm Hannon , Raymond Patrick Mallette , Paul Sheldon Tyler , Steven Harry Voss , Albert John Wallash
发明人： Samir Elias Abboud , Nickolas Christopher Apuzzo , Jeffrey Bernard Brown , Earl Albert Cunningham , David Malcolm Hannon , Raymond Patrick Mallette , Paul Sheldon Tyler , Steven Harry Voss , Albert John Wallash
IPC分类号： G11B5/00 , G11B5/39 , G11B5/465 , G11B5/48 , H01L43/12 , G11B5/127
CPC分类号： G11B5/3903 , G11B5/465 , G11B5/4886 , G11B2005/0008 , Y10T29/49034
摘要： The magnetic states of MR reproducing heads are reinitialized during media drive manufacturing by applying initializing magnetic fields to the transducers after they have been manufactured and incorporated into media drive assemblies.

10. 发明授权

US06760184B1 Compact servo pattern optimized for M-R heads 失效
标题翻译：针对M-R磁头优化的紧凑型伺服模式
公开(公告)号：US06760184B1
公开(公告)日：2004-07-06
申请号：US09499136
申请日：2000-02-07
申请人： Earl Albert Cunningham
发明人： Earl Albert Cunningham
IPC分类号： G11B5596
CPC分类号： G11B5/59655 , G11B5/59688
摘要： A disk drive system has a servo pattern with bursts that are recorded without multiple passes per burst and without trimming, so that the servo pattern bursts have the same width as the data tracks. The servo write steps occur in partial data track pitch (DTP) increments. A magneto-resistive (M-R) head is used to both record the servo pattern and transduce it. In a two-frequency system, relative gain calibration is performed using AGC circuitry to first calibrate one frequency and then the other. The resulting servo position error sensing (PES) signal has improved linearity and is simpler to write.
摘要翻译：磁盘驱动器系统具有脉冲串的脉冲串，每个脉冲串不进行多次通过而不进行修整，因此伺服模式脉冲串具有与数据磁道相同的宽度。伺服写入步骤发生在部分数据磁道间距（DTP）增量中。磁阻（M-R）头用于记录伺服模式并转换。在双频系统中，使用AGC电路执行相对增益校准，以首先校准一个频率，然后另一个频率。所得到的伺服位置误差感测（PES）信号具有改善的线性，并且写入更简单。

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