公开(公告)号：US09721603B2

公开(公告)日：2017-08-01

申请号：US15237878

申请日：2016-08-16

Applicant: Seagate Technology LLC

Inventor： Daniel W. Olson ,  Declan Macken ,  Andrea L. Geer

IPC: G11B5/60

CPC classification number: G11B5/6011 ,  G11B5/6035 ,  G11B5/607 ,  G11B5/6076

Abstract: An apparatus comprises circuitry configured to apply an AC signal having a frequency to one of a slider of a recording head and a magnetic recording medium. The applied AC signal causes an oscillation in an electrostatic force and clearance between the slider and the medium at the frequency of the AC signal. A thermal sensor is configured to generate a sensor signal at the AC signal frequency in response to sensing changes in temperature resulting from the oscillating clearance. A detector is coupled to the circuitry and the thermal sensor. The detector is configured to detect one or both of head-medium spacing changes and head-medium contact using a phase of a first harmonic or an amplitude of a second harmonic of the thermal sensor signal.

公开(公告)号：US09607642B1

公开(公告)日：2017-03-28

申请号：US15007728

申请日：2016-01-27

Applicant: Seagate Technology LLC

Inventor： Won Choul Yang ,  Jin Pil Kim ,  Shi Jung Kim

IPC: G11B5/60

CPC classification number: G11B5/6076 ,  G11B5/6035 ,  G11B5/607

Abstract: An AC signal having a specified frequency and a DC offset voltage is applied to a slider substrate or a magnetic recording medium. A low- or non-modulation interface is defined between the slider and medium. In response to applying the AC signal, an oscillation in an electrostatic force occurs between the slider and the medium at the specified frequency, which causes an oscillation in thermal sensor signal at the slider, which oscillates at the specified frequency. A heater of the slider is adjusted to decrease spacing between the slider and medium during oscillation of the electrostatic force. For each heater adjustment, thermal sensor resistance is measured over a specified number of medium revolutions. Head-medium contact is detected using one of an amplitude of a harmonic of the thermal sensor signal and a summation of amplitudes of all frequency components at the specified frequency.

公开(公告)号：US20030043491A1

公开(公告)日：2003-03-06

申请号：US10119178

申请日：2002-04-09

Inventor： Jason W. Riddering ,  Lee C. Knippenberg

IPC: G11B019/02 ,  G11B021/02

CPC classification number: G11B7/122 ,  G11B5/581 ,  G11B5/6035

Abstract: A disc drive includes a head with an air bearing surface that provides a fly height spacing. A fly height spacing control system provides a control signal to a head electrical connection on a head and a disco electrical connection on a disc. Fly height is controlled electrostatically. A disconnect circuit couples the control signal to the disc electrical connection. The disconnect circuit provides a disconnection of the control signal when contact is sensed. A contact sensor senses an electrical current component of the control signal that indicates contact between the head and the disc.

Abstract translation: 盘驱动器包括具有提供飞高高度间隔的空气轴承表面的头部。 飞行高度间距控制系统为头上的头部电气连接和盘上的迪斯科电气连接提供控制信号。 飞行高度被静电控制。 断开电路将控制信号耦合到盘电连接。 当检测到接触时，断路电路提供控制信号的断开。 接触传感器感测指示头部和盘之间接触的控制信号的电流分量。

公开(公告)号：US06366416B1

公开(公告)日：2002-04-02

申请号：US09497370

申请日：2000-02-03

Applicant: Dallas W. Meyer ,  Mark J. Schaenzer ,  Zhu Feng ,  Chung Yuang Shih ,  Chiu-Shing Frank Poon ,  Vidyadhara K. Gubbi

Inventor： Dallas W. Meyer ,  Mark J. Schaenzer ,  Zhu Feng ,  Chung Yuang Shih ,  Chiu-Shing Frank Poon ,  Vidyadhara K. Gubbi

IPC: G11B502

CPC classification number: G11B33/10 ,  G11B5/012 ,  G11B5/6035 ,  G11B5/6076 ,  G11B2005/001

Abstract: An apparatus and method for evaluating surface characteristics of a recording disc prior to incorporation into a disc drive. A glide test system includes a glide test head supportable over the disc, the glide test head having a negative-pressure air bearing slider and a contact sensor which outputs a signal when the glide test head contacts a feature of the disc surface. The glide test head and the disc are characterized as opposing plates of a variable capacitor with a dielectric layer therebetween including at least a layer of air supporting the glide test head. A voltage source, operably coupled to the glide test head and the disc, applies a fly height control voltage across the capacitor to adjust the fly height of the glide test head. The disc surface preferably comprises a data region configured to magnetically store data as the disc is rotated and a texturized landing zone configured to support the disc drive read/write head when the disc is stopped. The voltage source accordingly applies a first fly height control voltage to maintain the glide test head at a first glide distance over the data region and a second fly height control voltage to maintain the glide test head at a second, greater glide distance over the landing zone.

公开(公告)号：US20100128383A1

公开(公告)日：2010-05-27

申请号：US12623345

申请日：2009-11-20

Applicant: Shinji MATSUSHITA ,  Kenichi Kuramoto ,  Kanji Kuroki ,  Takahiro Nishioka ,  Masayuki Ishikawa

Inventor： Shinji MATSUSHITA ,  Kenichi Kuramoto ,  Kanji Kuroki ,  Takahiro Nishioka ,  Masayuki Ishikawa

IPC: G11B21/02

CPC classification number: G11B5/6029 ,  G11B5/6005 ,  G11B5/6035 ,  G11B5/6058 ,  G11B5/6064 ,  G11B5/607

Abstract: A disk drive. The disk drive includes a disk configured to store data, a slider configured to fly in proximity to the disk, and a magnetic-recording head on the slider configured to access the disk. The disk drive also includes a moving mechanism configured to support and to move the head-slider, an adjustment portion configured to adjust clearance between the magnetic-recording head and the disk, and a controller configured to control the adjustment portion to control the clearance. The controller is configured to perform clearance control in a first mode in an operation selected from the group consisting of reading user data and writing user data according to a change in fly height of the slider after a load operation, and subsequently is configured to perform clearance control in a second mode in an operation selected from the group consisting of reading user data and writing user data.

Abstract translation: 磁盘驱动器 磁盘驱动器包括被配置为存储数据的盘，被配置为在盘附近飞行的滑块以及被配置为访问盘的滑块上的磁记录头。 磁盘驱动器还包括移动机构，其被配置为支撑和移动磁头滑动器，配置成调节磁记录磁头和磁盘之间的间隙的调整部分以及​​被配置为控制调整部分来控制间隙的控制器。 控制器被配置为在从包括读取用户数据和在加载操作之后根据滑块的飞行高度的改变来写入用户数据的组中选择的操作中执行第一模式中的间隙控制，并且随后被配置为执行间隙 在从包括读取用户数据和写入用户数据的组中选择的操作中以第二模式进行控制。

公开(公告)号：US07450333B2

公开(公告)日：2008-11-11

申请号：US11647970

申请日：2006-12-29

Applicant: Toshiki Hirano ,  Bernhard E. Knigge

Inventor： Toshiki Hirano ,  Bernhard E. Knigge

IPC: G11B21/02 ,  G11B21/24

CPC classification number: G11B5/6017 ,  G11B5/6035

Abstract: A mechanism for maintaining a constant fly-height of a slider comprises a capacitive fly-height change sensor and an electrostatic fly-height controller. The capacitive fly-height change sensor is configured for coupling with the slider, which is in a head gimbal assembly. The capacitive fly-height change sensor is also configured for measuring a capacitance between the slider and a surface of a disk through the use of a fly-height change sensing signal, and outputting a sensor voltage which is substantially proportional to a sensed change in said capacitance. The electrostatic fly-height controller is coupled with the capacitive fly-height change sensor and configured to couple with the slider. The electrostatic fly-height controller is configured to process the sensor voltage into a fly-height control signal for electrostatically maintaining a constant fly-height of the slider relative to the surface of the disk.

Abstract translation: 用于保持滑块的恒定飞行高度的机构包括电容式飞行高度变化传感器和静电飞行高度控制器。 电容式飞行高度变化传感器被配置为与位于头部万向节组件中的滑动件联接。 电容式飞行高度变化传感器还被配置用于通过使用飞高变化感测信号来测量滑块和盘表面之间的电容，并且输出与所述的高度变化感测信号中的感测变化基本成比例的传感器电压 电容。 静电飞行高度控制器与电容式飞行高度变化传感器耦合，并配置成与滑块相连。 静电飞行高度控制器被配置为将传感器电压处理成飞行高度控制信号，以静电保持滑块相对于盘表面的恒定飞行高度。

公开(公告)号：US20080218895A1

公开(公告)日：2008-09-11

申请号：US11713812

申请日：2007-03-05

Applicant: John E. Scura ,  Thao A. Nguyen ,  David Tung

Inventor： John E. Scura ,  Thao A. Nguyen ,  David Tung

IPC: G11B21/02

CPC classification number: G11B5/6035 ,  G11B5/6017

Abstract: Certain example embodiments relate to techniques for more precisely adjusting the spacing between a head and a disk in a disk drive device. A spindle motor of a disk drive device may be electrically isolated from at least the base plate by means of, for example, a nonconductive adhesive. Circuitry for monitoring and/or applying a voltage to the head and/or to the disk to control an amount of spacing between the head and the disk may be provided. In certain example embodiments, such circuitry may monitor the disk voltage and then apply an appropriate voltage bias to the head to control the spacing therebetween electrostatically. In certain other example embodiments, such circuitry may monitor the head voltage and then adjust the spindle voltage accordingly. In still other example embodiments, the disk voltage and the head voltage may be controlled and/or adjusted based on a known voltage differential so that a precise disk/head voltage potential is achieved.

Abstract translation: 某些示例性实施例涉及用于更精确地调整磁盘驱动器装置中磁头和磁盘之间的间隔的技术。 磁盘驱动装置的主轴电动机可以通过例如非导电粘合剂与至少基板电隔离。 可以提供用于监视和/或向磁头和/或磁盘施加电压以控制磁头和磁盘之间的间隔的电路。 在某些示例性实施例中，这样的电路可以监视磁盘电压，然后对磁头施加适当的电压偏置，以在静电之间控制间隔。 在某些其他示例性实施例中，这种电路可以监控磁头电压，然后相应地调整主轴电压。 在其他示例性实施例中，可以基于已知的电压差来控制和/或调整盘电压和磁头电压，从而实现精确的磁盘/磁头电压电位。

公开(公告)号：US20080123214A1

公开(公告)日：2008-05-29

申请号：US11605741

申请日：2006-11-28

Applicant: Li-Yan Zhu ,  Chao-Hui Yang ,  Yen Fu ,  Ellis T. Cha

Inventor： Li-Yan Zhu ,  Chao-Hui Yang ,  Yen Fu ,  Ellis T. Cha

IPC: G11B21/02

CPC classification number: G11B5/581 ,  G11B5/6029 ,  G11B5/6035

Abstract: In a system and method for a non-contact measurement of the fly height of a slider above a magnetic data storage medium using electrostatic force, a slider with a read/write head flies over a magnetic data storage medium. A series of distinct voltages are applied between the slider and the magnetic data storage medium, and corresponding read-back signals are recorded. Using the recorded read-back signals, coefficients for an empirical curve-fit equation are calculated. The coefficients are normalized and converted into a fly height measurement.

公开(公告)号：US07321476B2

公开(公告)日：2008-01-22

申请号：US11192860

申请日：2005-07-29

Applicant: Peter Michael Baumgart ,  Bernhard E. Knigge ,  Charles Mathew Mate

Inventor： Peter Michael Baumgart ,  Bernhard E. Knigge ,  Charles Mathew Mate

IPC: G11B27/36 ,  G11B21/02

CPC classification number: G11B5/6005 ,  G11B5/3106 ,  G11B5/40 ,  G11B5/6035

Abstract: A method and system for determining contact potential voltages between a slider body and a hard disk of a hard disk drive. In embodiments of the present invention, at least one continuous negative direct current (DC) voltage is applied between a slider body and a hard disk of a hard disk drive. Then, at least one continuous positive direct current (DC) voltage is applied between the slider body and the hard disk. A contact potential voltage between the slider body and the hard disk is then determined in response to the applying of the direct current voltages.

Abstract translation: 一种用于确定滑块体和硬盘驱动器的硬盘之间的接触电位的方法和系统。 在本发明的实施例中，在滑块体和硬盘驱动器的硬盘之间施加至少一个连续的负直流（DC）电压。 然后，在滑块体和硬盘之间施加至少一个连续的正直流（DC）电压。 然后响应于施加直流电压来确定滑块体和硬盘之间的接触电位电压。

公开(公告)号：US07016139B2

公开(公告)日：2006-03-21

申请号：US10691752

申请日：2003-10-22

Applicant: Peter Michael Baumgart ,  Bernhard Knigge ,  Mathew Mate

Inventor： Peter Michael Baumgart ,  Bernhard Knigge ,  Mathew Mate

IPC: G11B21/02

CPC classification number: G11B5/6005 ,  G11B5/3106 ,  G11B5/40 ,  G11B5/6035

Abstract: An electrical potential difference between a slider body and a hard disk of a hard disk drive is eliminated based on the flying-height spacing of the slider body between the slider body and the hard disk. A predetermined bias voltage is applied between the slider body and the hard disk that includes a DC component and an AC component and that is based on the detected flying-height spacing of the slider body. The flying-height spacing can be detected based a minimum slider-to-disk clearance change from a design flying height of the slider at a frequency of the AC component as the DC component of the predetermined bias voltage is varied. Alternatively, the flying-height spacing can be detected based on a minimum electrodynamic response of the slider to a first harmonic of the AC frequency of the AC component as the DC component is varied.

Abstract translation: 基于滑块体和硬盘之间的滑块体的飞行高度间隔，消除了滑块体和硬盘驱动器的硬盘之间的电位差。 在滑块本体和包括DC分量和AC分量的硬盘之间施加预定的偏置电压，并且基于检测到的滑块体的飞行高度间隔。 可以基于当预定偏置电压的DC分量变化时在AC分量的频率处的滑块的设计飞行高度的最小滑块到盘间隙的变化来检测飞行高度间隔。 或者，可以基于随着DC分量变化，滑块对AC分量的AC频率的一次谐波的最小电动响应而检测飞高高度间隔。