公开(公告)号：WO1998002715A1

公开(公告)日：1998-01-22

申请号：PCT/US1997012095

申请日：1997-07-11

Applicant: PHASE METRICS

Inventor： PHASE METRICS ,  MACHCHA, Ashok, R. ,  LUE, Kok ,  WOMACK, Kenneth, H. ,  BREZOCZKY, Blasius ,  ABRAHAM, Daniel, L.

IPC: G01B09/02

CPC classification number: G01B11/14

Abstract: A coated transparent interferometric reference (34) for an optical tester (10). In accordance with one aspect of the present invention, the coated reference surface (34) provides improved tribological and optical properties as would be desirable for a disk (16) in an interferometric flying height tester (10).

Abstract translation: 用于光学测试器（10）的经涂覆的透明干涉仪（34）。 根据本发明的一个方面，涂覆的参考表面（34）提供了对于干涉式飞行高度测试仪（10）中的盘（16）所期望的改进的摩擦学和光学性质。

公开(公告)号：WO1997039450A1

公开(公告)日：1997-10-23

申请号：PCT/US1997006140

申请日：1997-04-14

Applicant: PHASE METRICS

Inventor： PHASE METRICS ,  BAKER, Bill, R.

IPC: G11B21/10

CPC classification number: G11B5/48 ,  G11B21/106

Abstract: A non-contact servo writing system positions a hard disk drive transducer. A light source (72) mounted on a master assembly's master arm (54) reflects light off a reflector (66) mounted on the hard drive arm (58). A sensor (76) mounted on the master arm generates a signal proportional to the amount of reflected light received from the reflector. A servo controller (70) coupled to the sensor controls hard drive arm movement according to the signal generated. In one embodiment, the sensor comprises a circuit having first and second photosensing elements. The circuit generates first and second signals proportional to the reflected light amount received by the first and second photo sensing elements respectively. The sensor also provides a sensor output signal, used by the servo controller to move the hard drive arm, representative of the difference between the first and second signals, and of disk drive arm position with respect to the master arm.

Abstract translation: 非接触伺服写入系统定位硬盘驱动器换能器。 安装在主组件的主臂（54）上的光源（72）将光从安装在硬盘驱动器臂（58）上的反射器（66）反射。 安装在主臂上的传感器（76）产生与从反射器接收的反射光量成比例的信号。 耦合到传感器的伺服控制器（70）根据产生的信号来控制硬盘驱动臂的移动。 在一个实施例中，传感器包括具有第一和第二光敏元件的电路。 该电路分别产生与由第一和第二感光元件接收的反射光量成比例的第一和第二信号。 该传感器还提供传感器输出信号，由伺服控制器用来移动硬盘驱动器臂，代表第一和第二信号之间的差异，以及相对于主控臂的磁盘驱动器臂位置。

公开(公告)号：WO1997039365A1

公开(公告)日：1997-10-23

申请号：PCT/US1997005731

申请日：1997-04-08

Applicant: PHASE METRICS

Inventor： PHASE METRICS ,  POGREBINSKY, Vladimir ,  IOSILEVSKY, Igor ,  BURT, George, A., Jr. ,  FERRY, David

IPC: G01R33/12

CPC classification number: G01R33/1207

Abstract: A method and apparatus (60) for detecting defects on the surface of a data recording medium. In one embodiment the present invention includes a sensor (62) for detecting defects on the surface of a magnetic disk. The sensor (62) generates an analog voltage signal that is representative of a surface anomaly detected on the disk surface. An analog signal processor (64) processes the signal before it is received by a peak detecting circuit (68). The peak detecting circuit (68) detects and converts a peak of the analog signal into digital data. The digital data is received and manipulated by a digital signal processor (70) where the peak amplitude, average peak amplitude and average peak power of the defect may be calculated.

Abstract translation: 一种用于检测数据记录介质表面上的缺陷的方法和装置（60）。 在一个实施例中，本发明包括用于检测磁盘表面上的缺陷的传感器（62）。 传感器（62）产生代表在盘表面上检测到的表面异常的模拟电压信号。 模拟信号处理器（64）在由峰值检测电路（68）接收之前处理该信号。 峰值检测电路（68）检测并将模拟信号的峰值转换为数字数据。 数字数据由数字信号处理器（70）接收和操纵，其中可以计算缺陷的峰值振幅，平均峰值振幅和平均峰值功率。

公开(公告)号：WO1997038324A1

公开(公告)日：1997-10-16

申请号：PCT/US1997005650

申请日：1997-04-04

Applicant: PHASE METRICS

Inventor： PHASE METRICS ,  SHELOR, John, R.

IPC: G01R33/12

CPC classification number: G01R33/12 ,  G11B5/3166 ,  G11B5/398 ,  G11B5/455 ,  G11B5/4806 ,  G11B33/10 ,  G11B2005/0016

Abstract: Apparatus (10) for testing a plurality of magnetic recording heads (12). The apparatus includes a tool (16) which supports a bar (14) that contains individual magnetic recording heads. Alternatively, the tester may contain a tool which supports a plurality of individual sliders. The tool (16) locates the heads within a magnetic field emanating from a coil (22) wound magnet (20). The magnet has a length and permeability that provides a uniform magnetic field for each slider in the bar. The apparatus (10) includes a probe card (32) that has a plurality of probe needles (34) which make simultaneous contact with bonding pads (36) of each head (12). The needles (34) are coupled to a test circuit that applies constant current to the magnetic recording heads and measures a voltage change as a function of a varying magnetic field. The tester can sequentially test the heads without spatially moving the bar, thereby minimizing test cycle time may test two or more of the heads simultaneously.

Abstract translation: 用于测试多个磁记录头（12）的装置（10）。 该装置包括支撑包含单个磁记录头的条（14）的工具（16）。 或者，测试器可以包含支撑多个单独滑块的工具。 工具（16）将磁头定位在从卷绕磁体（20）的线圈（22）发出的磁场内。 磁体具有长度和磁导率，为棒中的每个滑块提供均匀的磁场。 所述装置（10）包括探针卡（32），其具有与每个头部（12）的接合焊盘（36）同时接触的多个探针（34）。 针（34）耦合到测试电路，该测试电路向磁记录头施加恒定电流，并测量作为变化磁场的函数的电压变化。 测试仪可以顺序地测试头部而不空间地移动杆，从而最小化测试周期时间可以同时测试两个或更多个头部。

公开(公告)号：WO1997022121A1

公开(公告)日：1997-06-19

申请号：PCT/US1996019703

申请日：1996-12-11

Applicant: PHASE METRICS

Inventor： PHASE METRICS ,  BALSTER, Charles ,  WANEK, Donald ,  LOTH, Steven

IPC: G11B21/21

CPC classification number: G11B21/16 ,  G11B5/455 ,  G11B5/4806 ,  G11B5/4833 ,  G11B5/5534 ,  G11B21/21 ,  G11B21/24 ,  G11B33/10

Abstract: A Head Gimbal Assembly (HGA) loader using sub-ambient air pressure to move a magnetic head of the HGA over a test surface. Clamp (10) mounts HGA (12) adajcent to nozzle (24). Nozzle (24) draws in air (30) through orifice (50) creating a sub-ambient pressure region below suspension beam (18), causing ambient air to flow into the created sub-ambient void. Air flow (30) moves suspension beam (18) away from the surface of disk (22) unloading HGA (12). The sub-ambient pressure level and the separation between head (14) and disk (22) is varied by a computer controlled regulator valve (32). The loader can be used in a flying height tester calibrated by taking optical data while varying flying height by changing sub-ambient pressure. The sub-ambient pressure created by orifice (50) causes HGA (12) to bend about its natural pivot point or the bend radius of the suspension or load beam (18), which does not create additional slider angles during testing, nor introduce any mechanical sliding motion which could generate debris.

Abstract translation: 使用低于环境空气压力的头部云台装置（HGA）装载机将HGA的磁头移动到测试表面上。 夹具（10）将HGA（12）安装到喷嘴（24）上。 喷嘴（24）通过孔口（50）吸入空气（30），从而产生悬浮梁（18）下方的低于环境压力的区域，使环境空气流入所产生的次环境空隙。 空气流（30）将悬挂梁（18）移动离开卸载HGA（12）的盘（22）的表面。 通过计算机控制的调节阀（32）改变副环境压力水平以及头部（14）和盘（22）之间的分离。 装载机可用于飞行高度测试仪，通过拍摄光学数据校准，同时通过改变次环境压力来改变飞行高度。 由孔口（50）产生的次环境压力导致HGA（12）围绕其自然枢转点或悬架或负载梁（18）的弯曲半径弯曲，这在测试期间不产生额外的滑块角度，也不引入任何 可能产生碎片的机械滑动运动。

公开(公告)号：WO1997009604A1

公开(公告)日：1997-03-13

申请号：PCT/US1996012707

申请日：1996-08-05

Applicant: PHASE METRICS

Inventor： PHASE METRICS ,  LACEY, Christopher, A. ,  WOMACK, Kenneth, H.

IPC: G01N21/21

CPC classification number: G01N21/211

Abstract: An apparatus and method for measuring the space (36) between a transparent member (12) such as a disk, and a reflective member (14) such as a slider, by detecting a change of polarization of a reflected light beam. The apparatus (10) includes a light source (20) that emits a light beam which is circularly polarized, directed onto the disk (12) and reflected off of the interface between the disk (12) and the slider (14). The reflected light beam is split into four separately polarized beams by a beam splitter/polarizer assembly (42, 50, 52) and the varying intensities measured by photodetectors (70, 72). Stokes parameters are computed from signals from the photodetectors (70, 72). Ellipsometric parameters delta and psi are computed from the Stokes parameters. The thickness of the space (36) and the complex index of refraction (n and k) of the slider (14) are computed from the delta and psi parameters.

Abstract translation: 通过检测反射光束的偏振变化来测量诸如盘片之类的透明构件（12）和诸如滑块的反射构件（14）之间的空间（36）的装置和方法。 该装置（10）包括一个光源（20），该光源（20）发射一圆形极化的光束，该光束被引导到盘片（12）上，并从该盘片（12）和该滑块（14）之间的界面反射出来。 通过分束器/偏振器组件（42,50,52）将反射光束分成四个分开的偏振光束，并且由光电检测器（70,72）测量的变化的光强度。 从来自光电检测器（70,72）的信号计算斯托克斯参数。 椭圆偏振参数delta和psi由斯托克斯参数计算。 从Δ和psi参数计算滑块（14）的空间（36）的厚度和复合折射率（n和k）。

公开(公告)号：WO1996010192A1

公开(公告)日：1996-04-04

申请号：PCT/US1995011699

申请日：1995-09-15

Applicant: PHASE METRICS

Inventor： PHASE METRICS ,  INBAR, Michael

IPC: G01R33/12

CPC classification number: G01R33/1253 ,  G11B5/455 ,  G11B2005/0016

Abstract: A tester for measuring the resistance of magnetoresistive heads as a function of the magnetic field applied to the heads is disclosed. The tester applies a time varying magnetic field to the magnetoresistive head to be tested and filters the resulting time varying (AC) voltage signal indicative of the resistance of the head with a capacitor to remove the DC component of the signal. The AC component of the signal is then amplified, digitized, and analyzed to obtain the resistance properties of the magnetoresistive head.

Abstract translation: 公开了一种用于测量作为施加到磁头的磁场的函数的磁阻磁头的电阻的测试器。 测试仪对待测试的磁阻头施加时变磁场，并且用电容器滤除产生的表示电阻电阻的时变（AC）电压信号以去除信号的直流分量。 然后对信号的AC分量进行放大，数字化和分析，以获得磁阻头的电阻特性。

公开(公告)号：WO1993008445A1

公开(公告)日：1993-04-29

申请号：PCT/US1992008908

申请日：1992-10-19

Applicant: PHASE METRICS

Inventor： PHASE METRICS ,  LACEY, Christopher

IPC: G01B09/02

CPC classification number: G11B5/54 ,  G01B11/14 ,  G11B21/12 ,  G11B21/21 ,  G11B33/10

Abstract: The apparatus and method for measuring a small spacing down to contact uses an interferometric fringe intensity calibration to calibrate maximum and minimum intensity of two or more monochromatic or quasi-monochromatic interference patterns caused by a spacing between two articles (10, 12), one of which is transparent (10). The intensity calibration is done by measuring maximum and minimum fringe intensity of each color (2) while altering the spacing (51) by at least 1/4 of the wavelength of the light or other electromagnetic radiation being used. The calibration by changing spacing allows the fringe order to be calculated (26) for each wavelength of the radiation being used. This calibration procedure allows the maximum and minimum intensity of the radiation to be known, as well as the fringe order of the interference patterns to be calculated. With the maximum and minimum intensities and the fringe orders known, the spacing is readily calculated from interferometric theory.