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1. 发明授权

US07064841B2 Method and arrangement for topographically characterizing a surface of a hard disk with distortion due to disk modes removed 失效
标题翻译：用于由于磁盘模式被去除而导致具有变形的硬盘表面的地形学表征的方法和装置
公开(公告)号：US07064841B2
公开(公告)日：2006-06-20
申请号：US10782910
申请日：2004-02-23
申请人： Jianmin Wang , Jason L. Pressesky , Huan Tang , Jing Gui
发明人： Jianmin Wang , Jason L. Pressesky , Huan Tang , Jing Gui
IPC分类号： G01B9/02
CPC分类号： G01B11/303 , G01B9/02081 , G01B2290/45 , G01B2290/70 , G11B5/82
摘要： An arrangement and method of measuring head-media spacing modulation (HMS_Wq) removes the portion of out-of-plane motion caused by disk modes from the dynamic measurements of hard disk surface topography. Employing time-domain measurement techniques, circumferential surface topographical measurements are made for a hard disk surface. A boundary wavelength is determined, and a first partial HMS_Wq value is determined based upon measurements taken at a first disk rotational speed. A second partial HMS_Wq value is determined based upon measurements taken at a second disk rotational speed. The first and second partial HMS_Wq values are combined to provide a complete and accurate HMS_Wq value, taking advantage of the principle that the disk mode location in the spatial domain topography spectrum converted from the measured time-domain data shifts when the disk rotation speed is changed during the measurement.
摘要翻译：测量头媒体间距调制（HMS_Wq）的布置和方法从硬盘表面形貌的动态测量中消除由磁盘模式引起的面外运动的部分。采用时域测量技术，对硬盘表面进行圆周表面形貌测量。确定边界波长，并且基于在第一盘旋转速度下进行的测量来确定第一部分HMS_Wq值。基于在第二盘旋转速度下进行的测量来确定第二部分HMS_Wq值。组合第一和第二部分HMS_Wq值以提供完整和准确的HMS_Wq值，利用以下原理：当盘旋转速度改变时，从测量的时域数据转换的空间域拓扑谱中的盘模式位置移位在测量期间。

2. 发明授权

US07092100B2 Quadrature phase shift interferometer (QPSI) decoder and method of decoding 有权
标题翻译：正交相移干涉仪（QPSI）解码器和解码方法
公开(公告)号：US07092100B2
公开(公告)日：2006-08-15
申请号：US10782875
申请日：2004-02-23
申请人： Jianmin Wang , Jason L. Pressesky
发明人： Jianmin Wang , Jason L. Pressesky
IPC分类号： G01B9/02
CPC分类号： G11B5/82 , G01B9/02081 , G01B9/02083 , G01B2290/45 , G01B2290/70
摘要： An arrangement and method for reliably finding the wave form extrema of interference signals produced by a quadrature phase shift interferometer (QPSI) takes advantage of the quadrature property of I and Q signals. The zero-crossing points in the I and Q signals are determined. Peak detection is performed for peaks and valleys in the Q signal in close proximity to the zero-crossing points in the I signal, and for peaks and valleys in the I signal in close proximity to the zero-crossing points in the Q signal. These represent the maximum and minimum points of the I and Q signals. From these points, intensity envelopes are created and QPSI phase wrapping is performed to determine the phase angle and ultimately, out-of-plane displacement may be determined.
摘要翻译：用于可靠地发现由正交相移干涉仪（QPSI）产生的干扰信号波形的布置和方法利用了I和Q信号的正交特性。确定I和Q信号中的过零点。对Q信号中的峰值和峰值进行峰值检测，其接近于I信号中的过零点，以及在靠近Q信号中的过零点的I信号中的峰值和谷值。这些表示I和Q信号的最大和最小点。从这些点，产生强度包络，并且执行QPSI相位缠绕以确定相位角，并且最终可以确定面外位移。

3. 发明授权

US07019840B2 Dual-beam interferometer for ultra-smooth surface topographical measurements 失效
标题翻译：双光束干涉仪用于超光滑表面形貌测量
公开(公告)号：US07019840B2
公开(公告)日：2006-03-28
申请号：US10690447
申请日：2003-10-21
申请人： Jianmin Wang , Jason L. Pressesky , Li-Ping Wang
发明人： Jianmin Wang , Jason L. Pressesky , Li-Ping Wang
IPC分类号： G01B9/02
CPC分类号： G01B11/306 , G11B5/012 , G11B2005/001
摘要： A method and apparatus for using a dual-beam interferometer to test surface flatness is provided. The interferometer directs two beams focused at distinct points on a testing surface, such as the surface of a magnetic recording disc. An offset distance “d” between the two beams is provided on the target surface. In the present invention, the separation distance “d” is adjustable. The feature of adjustable separation distance in the interferometer allows the interferometer to meet the different spatial frequency requirements of various applications. In operation, first and second reflected beams are returned to an intensity beam splitter, where they are split and then recombined into two new beams of substantially equal intensity. The second of the two new light beams is constructed by the interference of half intensity of the first and half intensity of second beams, and is sent to a photodiode. The photodiode generates signals in response to the changing interference fringes caused as a result of the modulation of the optical path length difference between the original first and second beams. A local height difference on the reflective surface is calculated relative to the separation distance “d”.
摘要翻译：提供了一种使用双光束干涉仪来测试表面平坦度的方法和装置。干涉仪引导聚焦在测试表面上的不同点的两个光束，例如磁记录盘的表面。两个光束之间的偏移距离“d”设置在目标表面上。在本发明中，分离距离“d”是可调节的。干涉仪间距可调的特点使得干涉仪能够满足各种应用的不同空间频率要求。在操作中，第一和第二反射光束被返回到强度分束器，在那里它们被分裂，然后再组合成两个基本相等强度的新光束。两个新光束中的第二个光束由第二光束的第一和第二强度的半强度的干扰构成，并被发送到光电二极管。光电二极管响应于原始第一和第二光束之间的光程长度差的调制而引起的干扰条纹变化而产生信号。相对于间隔距离“d”计算反射面上的局部高度差。

4. 发明授权

US07050173B2 Method and arrangement for removing noise and measurements of head-media spacing modulation for digital recording 有权
标题翻译：用于去除噪声的方法和装置以及用于数字记录的头 - 媒体间隔调制的测量
公开(公告)号：US07050173B2
公开(公告)日：2006-05-23
申请号：US10781697
申请日：2004-02-20
申请人： Jianmin Wang , Jason L. Pressesky
发明人： Jianmin Wang , Jason L. Pressesky
IPC分类号： G01B9/02
CPC分类号： G11B5/58
摘要： A method and arrangement for measuring head-media spacing modulation (HMS_Wq) employs a profilometer to measure the surface topography of a disk. A cumulative power spectral density (PSD) distribution is generated from the measured surface topography. Discontinuities and steps are identified in the PSD distribution. The discontinuities and steps are removed to create a corrected PSD distribution. A noise free spectrum is then reconstructed from the corrected PSD distribution.
摘要翻译：用于测量磁头 - 介质间距调制（HMS_Wq）的方法和装置采用轮廓仪来测量磁盘的表面形貌。从测量的表面形貌产生累积功率谱密度（PSD）分布。在PSD分发中确定了不连续性和步骤。删除不连续性和步骤以创建更正的PSD分布。然后从校正的PSD分布重建无噪声频谱。

5. 发明授权

US07916308B2 Method and optical profiler 失效
标题翻译：方法和光学分析仪
公开(公告)号：US07916308B2
公开(公告)日：2011-03-29
申请号：US10700625
申请日：2003-11-05
申请人： Jianmin Wang , Jason L. Pressesky , Shih-Fu Lee
发明人： Jianmin Wang , Jason L. Pressesky , Shih-Fu Lee
IPC分类号： G01B11/24
CPC分类号： G01B11/303 , G11B5/82 , G11B2005/001
摘要： An optical profiler for an ultra-smooth surface, such as a magnetic recording disk, provides for a normally incident beam deflection against the target surface to be profiled. A linearly polarized laser light of a first polarization is focused on the target surface in a normally incident direction. The beam is reflected back along its original path from the focal point. Optics are provided that change the polarization of the reflected beam to a second polarization. A reflected beam, with a second polarization, is directed onto a position sensitive detector for evaluation.
摘要翻译：用于超光滑表面的光学轮廓仪（例如磁记录盘）提供正常入射的光束偏转到要被成型的目标表面。第一极化的线偏振激光在正常入射方向上聚焦在目标表面上。光束沿其原始路径从焦点反射回来。提供了将反射光束的偏振改变为第二偏振的光学器件。具有第二极化的反射光束被引导到位置敏感检测器用于评估。

6. 发明授权

US06741357B2 Quadrature phase shift interferometer with unwrapping of phase 有权
标题翻译：具有相位展开的正交相移干涉仪
公开(公告)号：US06741357B2
公开(公告)日：2004-05-25
申请号：US10000001
申请日：2001-10-24
申请人： Jianmin Wang , Jason L. Pressesky
发明人： Jianmin Wang , Jason L. Pressesky
IPC分类号： G01B907
CPC分类号： G01B11/303 , G01B9/02081 , G01B9/02083 , G01B2290/45 , G01B2290/70
摘要： A method and apparatus for interferometnc measurement of a medium surface is disclosed. More particularly, a quadrature phase shift interferometer and a process for unwrapping phase are described. The interferometer has a reduced number of optical components though yields results sufficient to measure surface of a hard disc for final inspection. Defects on such a surface are characterized by their out-of-plane displacement with nanometer resolution.
摘要翻译：公开了用于介质表面的干涉测量的方法和装置。更具体地，描述了正交相移干涉仪和用于展开相位的过程。干涉仪具有减少数量的光学部件，尽管产生足以测量硬盘表面以最终检查的结果。在这种表面上的缺陷的特征在于其具有纳米分辨率的面外位移。

7. 发明授权

US5963029A Measuring magnetic properties in media by RMS signal processing and incremental erasure 失效
标题翻译：通过RMS信号处理和增量擦除测量介质中的磁性
公开(公告)号：US5963029A
公开(公告)日：1999-10-05
申请号：US789303
申请日：1997-01-30
申请人： Jason L. Pressesky
发明人： Jason L. Pressesky
IPC分类号： G01R33/12 , G11B5/00 , G11B5/012 , G11B27/36 , G11B33/10 , G01N27/72 , G11B5/02 , G11B27/34
CPC分类号： G11B5/012 , G01R33/1207 , G11B2005/001 , G11B27/36 , G11B33/10
摘要： A system for magnetically evaluating magnetic data storage media includes a spindle for rotatably supporting magnetic disks, a read/write transducer, and an erasing transducer, both supported for radial movement relative to the disk. The read/write transducer records a sequence of magnetically isolated transitions. When sensing the sequence, the read/write transducer generates a fringing field signal which is low pass filtered and RMS processed to provide a voltage proportional to the remanence-thickness product. The erasing transducer is a ring head transducer having a substantially larger gap and transducer/disk spacing as compared to an aerodynamically supported transducer. Consequently a Hall effect probe is positionable within the gap to directly measure the magnetic intensities of erase fields. Coercivity is determined by applying the erase fields in a sequence of increasing intensities, with each application followed by a measurement of the remanence-thickness product, until the remanence-thickness product has been reduced by one-half. The read/write transducer can be aerodynamically supported to more accurately replicate transitions encountered during normal use, or can be of the ring head type to enable testing of the disk at intermediate fabrication stages.
摘要翻译：用于磁性评估磁数据存储介质的系统包括用于可旋转地支撑磁盘的主轴，读/写换能器和擦除换能器，两者均被支撑用于相对于盘的径向移动。读/写换能器记录一系列磁隔离过渡。当读/写换能器产生一个边缘场信号，该信号经低通滤波和RMS处理，以提供与剩磁厚度乘积成比例的电压。与空气动力学支持的换能器相比，擦除换能器是具有相当大的间隙和换能器/盘间隔的环形头换能器。因此，霍尔效应探针可定位在间隙内以直接测量擦除场的磁强度。通过以增加的强度序列施加擦除场来确定矫顽力，每个应用随后是剩余厚度乘积的测量，直到剩磁厚度乘积减少了一半。读/写换能器可以被空气动力学支持，以更准确地复制在正常使用期间遇到的过渡，或者可以是环形头类型，以使得能够在中间制造阶段对盘进行测试。

8. 发明授权

US5999261A Split phase high performance, high frequency, high dynamic range interferometer 失效
标题翻译：分相高性能，高频，高动态范围干涉仪
公开(公告)号：US5999261A
公开(公告)日：1999-12-07
申请号：US113668
申请日：1998-07-10
申请人： Jason L. Pressesky , Yuh-Jen Cheng
发明人： Jason L. Pressesky , Yuh-Jen Cheng
IPC分类号： G01B9/02
CPC分类号： G01B9/0207 , G01B9/02011 , G01B9/02081 , G01B2290/45 , G01B2290/70
摘要： Processing two interference signals to reconstruct a target image includes splitting a laser beam into a reference beam and a measurement beam, and in turn splitting the reference beam into two sub-reference beams. A phase shift is introduced into one of the sub-reference beams, the phase shift being substantially 90 degrees. A measurement beam is reflected from a surface of a moving target, and split into two sub-measurement beams. A first respective sub-reference beam is combined with a first sub-measurement beam, and the second sub-reference beam is combined with the second sub-measurement beam, and the in phase and out of phase signals reconstruct the target surface. Adjustment of the split sub-reference beams is effected by Pockels cells to achieve the desired phase difference between the two sub-reference beams. The reconstructed motion of the target surface is effected with a selected frequency characteristic, spatial resolution and range characteristic.
摘要翻译：处理两个干扰信号以重建目标图像包括将激光束分成参考光束和测量光束，然后将参考光束分成两个子参考光束。相移被引入到一个子参考光束中，相移基本上为90度。测量光束从移动目标的表面反射，并分成两个子测量光束。第一相应的子参考光束与第一子测量光束组合，并且第二子参考光束与第二子测量光束组合，同相和异相信号重构目标表面。分裂子参考光束的调整由Pockels单元实现，以实现两个子参考光束之间的期望的相位差。目标表面的重建运动是用选定的频率特性，空间分辨率和范围特性来实现的。

9. 发明授权

US07009391B2 High throughput missing pattern detector for servo printed recording media 失效
标题翻译：伺服打印记录介质的高通量缺失图案检测器
公开(公告)号：US07009391B2
公开(公告)日：2006-03-07
申请号：US10685680
申请日：2003-10-15
申请人： Shih-Fu Lee , David Kuo , Jason L. Pressesky
发明人： Shih-Fu Lee , David Kuo , Jason L. Pressesky
IPC分类号： G01R33/12
CPC分类号： B82Y10/00 , G11B5/012 , G11B5/74 , G11B5/743 , G11B5/82 , G11B5/865 , G11B27/36 , G11B2005/001 , G11B2220/20
摘要： The present invention provides a method for detecting missing servo patterns on printed recording media. In general, the method first comprises the step of generating a map of anticipated servo burst patterns for a magnetic medium. The magnetic medium is typically a magnetic storage disc. Next, the magnetic medium is placed onto a disc reading assembly. Using the disc reading assembly, individual servo bursts on the magnetic medium are identified. In one embodiment, signals from the magnetic medium are processed through a frequency down conversion process, coupled with band pass filtering and rms-to-DC conversion. This enables higher throughput of signal processing. A map of identified servo bursts on the magnetic medium can then be generated. The map of identified servo bursts is then compared with the map of anticipated servo burst patterns. In this way, missing servo bursts can be detected.
摘要翻译：本发明提供一种用于检测印刷的记录介质上缺少的伺服图案的方法。通常，该方法首先包括产生磁介质的预期伺服脉冲串图形的映射的步骤。磁介质通常是磁存储盘。接下来，将磁性介质放置在盘读取组件上。使用盘读取组件，识别磁介质上的各个伺服脉冲串。在一个实施例中，来自磁介质的信号通过降频转换处理，与带通滤波和均方根到直流转换相结合。这样可以实现更高的信号处理吞吐量。然后可以产生在磁介质上识别的伺服脉冲串的映射。然后将所识别的伺服脉冲串的映射与预期的伺服脉冲串模式的映射进行比较。以这种方式，可以检测到丢失的伺服脉冲串。

10. 发明授权

US5898499A Method and apparatus for detecting surface discontinuities based on changes in an optical path length during beam scanning 失效
标题翻译：基于光束扫描期间光路长度的变化来检测表面不连续性的方法和装置
公开(公告)号：US5898499A
公开(公告)日：1999-04-27
申请号：US792172
申请日：1997-01-30
申请人： Jason L. Pressesky
发明人： Jason L. Pressesky
IPC分类号： G01N21/88 , G01B9/02
CPC分类号： G01N21/88
摘要： A system is disclosed for detecting local surface discontinuities in magnetic data storage disks. The system includes a spindle that rotatably supports a magnetic disk being tested. An interferometer generates a laser beam which is guided through an optics assembly supported above the magnetic disk, for linear movement radially of the disk. The combined radial and linear movement causes the laser beam to trace a spiral scanning path on the disk surface. The disk surface scatters the laser energy, a portion of which is returned to the interferometer and caused to interfere with a reference beam. The resulting interference intensity fluctuates in response to changes in the optical path length, thus measuring topographies of the discontinuities. A discontinuity recognition triggering pulse can be positioned in time with respect to indexing pulses, to identify the location of the associated discontinuity radially and angularly of the disk. The triggering pulses limit the storage of scanned surface data to the part of the data that locates and characterizes discontinuities exceeding a predetermined size threshold.
摘要翻译：公开了一种用于检测磁数据存储盘中局部表面不连续性的系统。该系统包括可旋转地支撑被测试的磁盘的主轴。干涉仪产生激光束，其被引导通过支撑在磁盘上方的光学组件，用于盘的径向线性移动。组合的径向和线性运动导致激光束跟踪盘表面上的螺旋扫描路径。磁盘表面散射激光能量，其一部分返回到干涉仪并导致干涉参考光束。所产生的干涉强度响应于光程长度的变化而波动，从而测量不连续性的形貌。可以相对于分度脉冲在时间上定位不连续识别触发脉冲，以便识别盘的径向和角度相关不连续的位置。触发脉冲将扫描表面数据的存储限制到定位的部分数据，并表征超过预定大小阈值的不连续性。

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