公开(公告)号：US20030042896A1

公开(公告)日：2003-03-06

申请号：US10228189

申请日：2002-08-27

Inventor： Masayuki Abe

IPC: G01R033/12

CPC classification number: G01R33/0385 ,  G01Q60/54 ,  G11B5/3166 ,  G11B5/455 ,  Y10S977/865

Abstract: In a magnetic head measuring apparatus for measuring a magnetic head, an amplitude-modulated electric current whose amplitude is modulated by a specified carrier wave frequency and modulation frequency is applied to a magnetic head. A calibrating magnetic field generating source causes the magnetic head to generate a magnetic field having a specified strength and frequency, thereby calibrating measurement variations of the magnetic head. A magnetic head measuring device measures a high-frequency magnetic field generated from the magnetic head. If necessary, an interchangeable magnetic material probe is used to replace a probe of the magnetic head measuring device.

公开(公告)号：US20030020463A1

公开(公告)日：2003-01-30

申请号：US09854071

申请日：2001-05-11

Applicant: Lord Corporation

Inventor： J. David Carlson ,  Gary W. Adams

IPC: G01N027/74 ,  G01R033/12 ,  G01F001/58 ,  G01F001/84

CPC classification number: G01N11/04 ,  G01N27/74

Abstract: A system and method for monitoring the composition of a magnetically permeable material, where the system comprises a first container containing a volume of magnetically permeable material; a flow path for flowing the magnetically permeable material out of the container; a sensor for determining the inductance of the magnetically permeable material; and a sensor for determining the density of the magnetically permeable material. The sensors for determining the density and inductance of the magnetically permeable material are flow connected to the flow path.

Abstract translation: 一种用于监测导磁材料的组成的系统和方法，其中所述系统包括容纳一定体积的导磁材料的第一容器; 用于使所述导磁材料流出所述容器的流动路径; 用于确定导磁材料的电感的传感器; 以及用于确定导磁材料的密度的传感器。 用于确定导磁材料的密度和电感的传感器流动连接到流动路径。

公开(公告)号：US20030011361A1

公开(公告)日：2003-01-16

申请号：US10173832

申请日：2002-06-19

Applicant: TDK Corporation

Inventor： Ken-ichi Takano

IPC: G01R033/12 ,  G01R033/09

CPC classification number: B82Y25/00 ,  B82Y10/00 ,  G11B5/3903 ,  G11B5/455 ,  G11B2005/0016 ,  G11B2005/3996 ,  Y10T29/49036

Abstract: A method and computer program to calculate a reproduction track width of an MR head. This method begins by subdividing the magnetic domain control layer of an MR element and lead conductors into several polyhedral elements. Thereafter, electric potentials are calculated for each of the polyhedral elements based on the resistance at each layer. A current density is determined for each of the polyhedral elements based on the calculated electric potentials. The current densities are integrated to calculate an initial resistance value. Further, the resistance of a local block is changed by a predetermined amount. The electric potential is calculated for each of the polyhedral elements, current density is acquired, and the acquired current densities is calculated to determine a resistance value. Finally, the reproduction track width is obtained based on the initial acquired resistance value and the acquired resistance value.

Abstract translation: 一种用于计算MR头的再现轨道宽度的方法和计算机程序。 该方法通过将MR元件的磁畴控制层和引线导体分成几个多面体元件开始。 此后，基于各层的电阻计​​算每个多面体元件的电位。 基于所计算的电位，确定每个多面体元件的电流密度。 集成电流密度以计算初始电阻值。 此外，局部块的电阻改变预定量。 对于每个多面体元素计算电位，获取电流密度，并且计算所获取的电流密度以确定电阻值。 最后，基于初始获取的电阻值和所获取的电阻值来获得再现轨迹宽度。

公开(公告)号：US20020113587A1

公开(公告)日：2002-08-22

申请号：US10072890

申请日：2002-02-12

Inventor： Jong-Yoon Kim

IPC: G01R033/12

CPC classification number: G11B5/09 ,  G11B5/012 ,  G11B20/1816 ,  G11B27/36 ,  G11B2005/0008 ,  G11B2005/0018 ,  G11B2220/20

Abstract: There is provided an apparatus and method for controlling a disc drive and, more particularly, an apparatus and method for restoring stability to a head of a hard disc drive, so that instability in a magneto resistive (MR) sensor of the disc drive can be restored through an electric shock. Instability of the MR head, i.e. incorrect alignment of the domain of the MR head, is determined by a bit error rate (BER) test and channel statistical measurement (CSM) test, and If instability of the MR bead is determined, the MR head is restored by applying electric shocks thereto. Therefore, the apparatus and method have advantages in that manufacturing process inferiority rate due to instability of head in a hard disc drive can be reduced, yield can be improved and the defect rate can be improved.

Abstract translation: 提供了一种用于控制盘驱动器的装置和方法，更具体地，提供一种用于恢复对硬盘驱动器的头部的稳定性的装置和方法，使得盘驱动器的磁阻（MR）传感器中的不稳定性可以是 通过电击恢复。 MR头的不稳定性，即MR头的域的不正确对准，由误码率（BER）测试和信道统计测量（CSM）测试确定，如果MR磁珠的不稳定性被确定，MR磁头 通过对其进行电击来恢复。 因此，该装置和方法的优点在于，可以降低由于硬盘驱动器中的磁头的不稳定性引起的制造工艺劣化率，可以提高产率，并且可以提高缺陷率。

公开(公告)号：US20020043973A1

公开(公告)日：2002-04-18

申请号：US09981775

申请日：2001-10-16

Inventor： Bijan K. Amini ,  James R. Carl

IPC: G01B007/06 ,  G01R033/12

CPC classification number: G01B7/10

Abstract: This invention pertains to a method and apparatus for determining the thickness of a ferromagnetic or paramagnetic material when only one side of the material is accessible. In one embodiment, the invention provides a method for engaging a constant signal with the ferromagnetic material for inducing a changed signal, generating a stepped saturation signal over a range of currents for engagement with the ferromagnetic material, detecting the changed signal as the saturation signal is varied over the range of currents, determining the relationship between the changed signal and the stepped saturation signal, and evaluating the thickness of the material based upon the relationship between the changed signal and the stepped saturation signal. In another embodiment, the invention provides for an apparatus comprising a transmitter for engaging a constant signal with the ferromagnetic material for creating a changed signal, a saturation device for generating a saturation signal over a range of currents for engagement with the ferromagnetic material, a receiver for detecting the changed signal as the saturation signal is varied over the range of currents, such that the relationship between the changed signal and the saturation signal is determined, and the thickness of the material based upon the relationship is determined.

Abstract translation: 本发明涉及一种仅当材料的一侧可接近时确定铁磁或顺磁性材料的厚度的方法和装置。 在一个实施例中，本发明提供了一种用于将恒定信号与铁磁材料接合以引起改变的信号的方法，用于在与铁磁材料接合的电流范围内产生阶梯饱和信号，当饱和信号为 在电流范围内变化，确定改变的信号和阶梯式饱和信号之间的关系，并且基于改变的信号和阶梯式饱和信号之间的关系来评估材料的厚度。 在另一个实施例中，本发明提供了一种装置，其包括用于将恒定信号与铁磁材料接合以产生改变的信号的发射器，用于在与铁磁材料接合的电流范围内产生饱和信号的饱和装置， 用于在饱和信号在电流范围上变化时检测改变的信号，从而确定改变的信号与饱和信号之间的关系，并且确定基于该关系的材料的厚度。

公开(公告)号：US20020027435A1

公开(公告)日：2002-03-07

申请号：US09864347

申请日：2001-05-23

Inventor： Gary D. Sorenson ,  Thomas J. Schmitt

IPC: G01R033/12

CPC classification number: G11B17/0287 ,  G11B5/012 ,  G11B33/10 ,  G11B2005/001

Abstract: A disc stabilizer for use in a spin-stand tester having a spindle motor for rotating a disc is provided. The spin-stand tester is capable of positioning a transducing head adjacent a first surface of the disc. The disc stabilizer includes a vacuum plate coupled to a spindle of the spindle motor. The vacuum plate has a top surface and a bottom surface opposite the top surface. At least one of the top and the bottom surfaces is a grooved surface including multiple vacuum channels. The grooved surface is substantially in contact with a second surface of the disc. Vacuum distributed through the multiple vacuum channels of the grooved surface is applied directly to the second surface of the disc, thereby holding the disc in place.

Abstract translation: 提供一种用于具有用于旋转盘的主轴电动机的旋转台测试器中的盘式稳定器。 旋转式测试仪能够将转换头定位在盘的第一表面附近。 盘稳定器包括联接到主轴电机的主轴的真空板。 真空板具有与顶表面相对的顶表面和底表面。 顶表面和底表面中的至少一个是包括多个真空通道的开槽表面。 开槽表面基本上与盘的第二表面接触。 通过沟槽表面的多个真空通道分配的真空被直接施加到盘的第二表面，从而将盘保持在适当位置。

公开(公告)号：US20010048303A1

公开(公告)日：2001-12-06

申请号：US09866763

申请日：2001-05-30

Inventor： Nozomu Hachisuka ,  Katsuhiko Tomita

IPC: G01R033/12

CPC classification number: G11B5/455 ,  G11B5/3103 ,  G11B5/3166 ,  Y10T29/49004 ,  Y10T29/53657

Abstract: A method for testing a thin-film magnetic head with a MR read head element includes a step of applying a low-frequency or DC external magnetic field to the thin-film magnetic head from a stationary magnetic field generation unit, a step of executing a high-frequency amplification of an output from the MR read head element under the application of the external magnetic field to provide a high-frequency amplified signal, a step of deriving only a high-frequency component from the high-frequency amplified signal to provide a high-frequency component signal, and a step of judging whether the thin-film magnetic head occurs a noise or not by using the high-frequency component signal.

Abstract translation: 一种用于测试具有MR读取头元件的薄膜磁头的方法包括从静止磁场产生单元向薄膜磁头施加低频或DC外部磁场的步骤，执行 在外部磁场的施加下从MR读取头元件输出的高频放大，以提供高频放大信号，从高频放大信号中仅得出高频分量的步骤，以提供 高频分量信号，以及通过使用高频分量信号来判断薄膜磁头是否发生噪声的步骤。

公开(公告)号：US20040239315A1

公开(公告)日：2004-12-02

申请号：US10858962

申请日：2004-06-02

Applicant: AGILENT TECHNOLOGIES, INC.

Inventor： Takahisa Mihara ,  Eiji Ishimto

IPC: G01R033/12

CPC classification number: G11B27/36 ,  G11B5/455 ,  G11B5/4886 ,  G11B2220/20

Abstract: A testing apparatus for testing a disk and/or head of a disk drive that includes a disk rotating device that rotates the disk and a rotary-positioning device that rotates and positions the head, with the rotary-positioning device supporting the head such that the attitude of the head relative to the center of rotation of the rotary-positioning device is tilted in comparison to the attitude of the head relative to the rotation center of the head in the disk drive.

Abstract translation: 一种用于测试磁盘驱动器的磁盘和/或磁头的测试装置，其包括旋转磁盘的盘旋转装置和旋转和定位磁头的旋转定位装置，旋转定位装置支撑磁头，使得 与头部相对于盘驱动器中的头部的旋转中心的姿态相比，头部相对于旋转定位装置的旋转中心的姿态倾斜。

公开(公告)号：US20040232910A1

公开(公告)日：2004-11-25

申请号：US10490908

申请日：2004-07-16

Inventor： Dennis J Ciplickas ,  Markus Decker ,  Christopher Hess ,  Brian E Stine ,  Larg H Weiland

IPC: G01B007/06 ,  G01R033/12

CPC classification number: H01L22/34 ,  H01L21/3212 ,  H01L2924/0002 ,  H01L2924/3011 ,  H01L2924/00

Abstract: A test structure combines a first structure (1010) for erosion evaluation with a second structure (1000) for extraction of defect size distributions. The first structure (1010) is a loop structure usable determine a resistance value that varies with metal height. The second structure is a NEST structure (1000). Loop lines of the loop structure (1010) are connected on both sides of the NEST structure (1000).

Abstract translation: 测试结构将用于侵蚀评估的第一结构（1010）与用于提取缺陷尺寸分布的第二结构（1000）组合。 第一结构（1010）是可用于确定随金属高度变化的电阻值的环路结构。 第二种结构是NEST结构（1000）。 环路结构（1010）的环路连接在NEST结构（1000）的两侧。

公开(公告)号：US20040207394A1

公开(公告)日：2004-10-21

申请号：US10840926

申请日：2004-05-07

Inventor： Larry K. Harthorn ,  Christopher B. Disher

IPC: G01N027/72 ,  G01R033/12

CPC classification number: G01N27/84 ,  G01B17/02 ,  G01N29/069 ,  G01N29/07 ,  G01N29/225 ,  G01N29/265 ,  G01N2291/02854 ,  G01N2291/105 ,  G01N2291/2636 ,  G01N2291/2675

Abstract: A system for inspecting a pipe weld from within a pipe through use of magnetic particle imaging nullMPInull includes an apparatus having a head unit that carries a wire wheel brush for cleaning an inspection area along an inner diameter of a pipe weld, and an MPI medium dispenser for spraying an MPI medium upon the inspection area, both controlled by an operator. The head unit also includes a video inspection device controlled by the operator and used for viewing at least portions of the inspection area after being sprayed with the MPI medium and when under the influence of a magnetic field to determine if the weld has any defects. The head unit is connected to a drive unit. The drive unit includes a frame having a longitudinal axis and mounted on a set of drive wheels, and a set of support wheels spaced axially from the drive wheels. A linear drive motor mounted to the frame and coupled to the drive wheels moves the head unit linearly along an interior of the pipe between weld inspection areas to allow the operator to locate and inspect the welds from within the pipe.

Abstract translation: 通过使用磁性粒子成像“MPI”来检测管道内的管道焊接系统包括具有头部单元的设备，该头部单元承载用于沿着焊接管的内径清洁检查区域的线轮刷，以及MPI 介质分配器，用于在检查区域喷射MPI介质，均由操作者控制。 头单元还包括由操作者控制的视频检查装置，并且用于在喷射MPI介质之后以及当在磁场的影响下观察至少部分检查区域以确定焊缝是否具有任何缺陷。 头单元连接到驱动单元。 驱动单元包括具有纵向轴线并安装在一组驱动轮上的框架以及与驱动轮轴向间隔开的一组支撑轮。 安装到框架并联接到驱动轮的线性驱动马达使焊接头单元在焊接检查区域之间沿管道的内部线性移动，以允许操作者定位和检查管道内的焊缝。