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    Preload modulation to reduce head motion hysteresis
    1.
    发明授权
    Preload modulation to reduce head motion hysteresis 有权
    预加载调制以减少磁头运动滞后

    公开(公告)号：US07889627B2

    公开(公告)日：2011-02-15

    申请号：US11935003

    申请日：2007-11-05

    Applicant: Narayanan Ramakrishnan ,  Patrick Beckrow Chu ,  Mark David Bedillion

    Inventor： Narayanan Ramakrishnan ,  Patrick Beckrow Chu ,  Mark David Bedillion

    IPC: G11B9/00

    CPC classification number: G11B9/1436 ,  B82Y10/00 ,  G01Q80/00 ,  Y10S977/947

    Abstract: An apparatus includes a data storage media and a plurality of heads, the data storage media and heads being structured and arranged for relative movement between the heads and storage media causing the heads to move along a scan path, and an actuator for changing a magnitude of head to media force as the heads move along the scan path. A method for reducing head motion hysteresis is also provided.

    Abstract translation: 一种装置包括数据存储介质和多个磁头，所述数据存储介质和磁头被构造和布置成用于磁头和存储介质之间的相对运动，从而使磁头沿扫描路径移动;以及致动器，用于改变幅度 当头沿扫描路径移动时，向媒体力量转移。 还提供了减少磁头运动滞后的方法。

    METHODS AND DEVICES FOR EXTRACTING OFF-TRACK MOTION USING MICROACTUATORS
    4.
    发明申请
    METHODS AND DEVICES FOR EXTRACTING OFF-TRACK MOTION USING MICROACTUATORS 有权
    使用微处理器提取离轨运动的方法和装置

    公开(公告)号：US20130152695A1

    公开(公告)日：2013-06-20

    申请号：US13326575

    申请日：2011-12-15

    Applicant: Narayanan Ramakrishnan ,  Stefan Alexander Weissner

    Inventor： Narayanan Ramakrishnan ,  Stefan Alexander Weissner

    IPC: G01B7/16

    CPC classification number: G11B5/5552 ,  G11B5/483

    Abstract: In certain embodiments, an apparatus includes a first piezoelectric (PZT) element poled in the same direction as a second PZT element. The first and second PZT elements are configured to be driven while simultaneously sensing motion. The apparatus further includes a circuit configured to add outputs of the first and second PZT elements, extract the sensed motion, and detect off-track motion from the extracted sensed motion.

    Abstract translation: 在某些实施例中，一种装置包括在与第二PZT元件相同的方向上极化的第一压电（PZT）元件。 第一和第二PZT元件被配置为在同时感测运动的同时被驱动。 该装置还包括配置成添加第一和第二PZT元件的输出，提取感测到的运动以及从提取的感测运动中检测离轨运动的电路。

    Disk drive flow control plate with integrated air management features
    5.
    发明授权
    Disk drive flow control plate with integrated air management features 有权
    磁盘驱动器流量控制板具有集成的空气管理功能

    公开(公告)号：US07787213B1

    公开(公告)日：2010-08-31

    申请号：US11608017

    申请日：2006-12-07

    Applicant: A. David L. Michael ,  Ed Acciardi ,  Narayanan Ramakrishnan

    Inventor： A. David L. Michael ,  Ed Acciardi ,  Narayanan Ramakrishnan

    IPC: G11B33/02 ,  G11B33/14

    CPC classification number: G11B25/043 ,  G11B33/148

    Abstract: A flow control plate (152) for a disk drive is disclosed. The flow control plate (152) includes both a diffuser section (156) and an air displacement section (168). The diffuser section (156) is contained within a pocket (160) having a plurality of spaced protuberances or ridges (164). The air displacement section (168) may be located upstream of the diffuser section (156) and includes a pair of flat primary surfaces (172) that are disposed in opposing and parallel relation. In one embodiment, the flow control plate (152) is an integral structure and is fabricated from a resinous material.

    Abstract translation: 公开了一种用于磁盘驱动器的流量控制板（152）。 流量控制板（152）包括扩散器部分（156）和空气排出部分（168）。 扩散器部分（156）包含在具有多个间隔开的突起或脊（164）的凹槽（160）内。 空气排出部分（168）可以位于扩散器部分（156）的上游，并且包括一对平行的主表面（172），它们以相对和平行的关系设置。 在一个实施例中，流量控制板（152）是整体结构，并且由树脂材料制成。

    Simultaneous Rotational Control Using Offset Linear Actuators
    6.
    发明申请
    Simultaneous Rotational Control Using Offset Linear Actuators 失效
    使用偏移线性执行器同时旋转控制

    公开(公告)号：US20080297289A1

    公开(公告)日：2008-12-04

    申请号：US11755812

    申请日：2007-05-31

    Applicant: Patrick Breckow Chu ,  Narayanan Ramakrishnan ,  Mark David Bedillion

    Inventor： Patrick Breckow Chu ,  Narayanan Ramakrishnan ,  Mark David Bedillion

    IPC: H01F7/08

    CPC classification number: G11B9/1481 ,  B82Y10/00

    Abstract: An apparatus includes a movable member, and first and second actuators coupled to the movable member at positions offset from a first axis that passes through a centroid of the movable member. A controller independently controls the first and second actuators to exert a first force on the movable member in a direction generally parallel to the first axis, thereby controlling both linear and rotational orientation of the movable member. The apparatus can further include third and fourth actuators coupled to the movable member at positions offset from a second axis that passes through the centroid of the movable member, and the controller can independently controlling third and fourth actuators.

    Abstract translation: 一种装置包括可移动构件，以及第一和第二致动器，其在与通过可移动构件的质心的第一轴线偏移的位置处联接到可动构件。 控制器独立地控制第一和第二致动器沿大致平行于第一轴线的方向在可动构件上施加第一力，从而控制可动构件的线性和旋转取向。 该装置还可以包括第三和第四致动器，该第三和第四致动器在与通过可移动构件的重心的第二轴线偏移的位置处联接到可动构件，并且控制器可以独立地控制第三和第四致动器。

    Methods and devices for extracting off-track motion using microactuators
    7.
    发明授权
    Methods and devices for extracting off-track motion using microactuators 有权
    使用微型致动器提取离轨运动的方法和装置

    公开(公告)号：US08934202B2

    公开(公告)日：2015-01-13

    申请号：US13326575

    申请日：2011-12-15

    Applicant: Narayanan Ramakrishnan ,  Stefan Alexander Weissner

    Inventor： Narayanan Ramakrishnan ,  Stefan Alexander Weissner

    IPC: G11B5/56 ,  G11B5/596

    CPC classification number: G11B5/5552 ,  G11B5/483

    Abstract: In certain embodiments, an apparatus includes a first piezoelectric (PZT) element poled in the same direction as a second PZT element. The first and second PZT elements are configured to be driven while simultaneously sensing motion. The apparatus further includes a circuit configured to add outputs of the first and second PZT elements, extract the sensed motion, and detect off-track motion from the extracted sensed motion.

    Abstract translation: 在某些实施例中，一种装置包括在与第二PZT元件相同的方向上极化的第一压电（PZT）元件。 第一和第二PZT元件被配置为在同时感测运动的同时被驱动。 该装置还包括配置成添加第一和第二PZT元件的输出，提取感测到的运动以及从提取的感测运动中检测离轨运动的电路。

    DEVICES AND METHODS FOR REDUCING LUBRICANT ACCUMULATION ON SLIDERS
    8.
    发明申请
    DEVICES AND METHODS FOR REDUCING LUBRICANT ACCUMULATION ON SLIDERS 有权
    用于减少滑块上润滑剂累积的装置和方法

    公开(公告)号：US20140022672A1

    公开(公告)日：2014-01-23

    申请号：US13553072

    申请日：2012-07-19

    Applicant: Narayanan Ramakrishnan ,  Ajaykumar Rajasekharan

    Inventor： Narayanan Ramakrishnan ,  Ajaykumar Rajasekharan

    IPC: G11B5/60

    CPC classification number: G11B5/6082

    Abstract: In certain embodiments, a slider includes an air bearing surface having a cavity. The cavity includes transition features at an upstream side of the cavity to mitigate air flow expansion along the cavity. Turbulence-inducing features are positioned on the transition features.

    Abstract translation: 在某些实施例中，滑块包括具有空腔的空气支承表面。 空腔包括在空腔的上游侧的过渡特征，以减轻沿着空腔的气流膨胀。 湍流诱导特征位于过渡特征上。

    Simultaneous rotational control using offset linear actuators
    10.
    发明授权
    Simultaneous rotational control using offset linear actuators 失效
    使用偏移线性执行器进行同步旋转控制

    公开(公告)号：US07948337B2

    公开(公告)日：2011-05-24

    申请号：US11755812

    申请日：2007-05-31

    Applicant: Patrick Breckow Chu ,  Narayanan Ramakrishnan ,  Mark David Bedillion

    Inventor： Patrick Breckow Chu ,  Narayanan Ramakrishnan ,  Mark David Bedillion

    IPC: H01H51/22

    CPC classification number: G11B9/1481 ,  B82Y10/00

    Abstract: An apparatus includes a movable member, and first and second actuators coupled to the movable member at positions offset from a first axis that passes through a centroid of the movable member. A controller independently controls the first and second actuators to exert a first force on the movable member in a direction generally parallel to the first axis, thereby controlling both linear and rotational orientation of the movable member. The apparatus can further include third and fourth actuators coupled to the movable member at positions offset from a second axis that passes through the centroid of the movable member, and the controller can independently controlling third and fourth actuators.

    Abstract translation: 一种装置包括可移动构件，以及第一和第二致动器，其在与通过可移动构件的质心的第一轴线偏移的位置处联接到可动构件。 控制器独立地控制第一和第二致动器沿大致平行于第一轴线的方向在可动构件上施加第一力，从而控制可动构件的线性和旋转取向。 该装置还可以包括第三和第四致动器，该第三和第四致动器在与通过可移动构件的重心的第二轴线偏移的位置处联接到可动构件，并且控制器可以独立地控制第三和第四致动器。

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