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    • 1. 发明授权
    • Calibration disk with disk bumps for calibrating PZT sliders
    • 校准盘,用于校准PZT滑块
    • US5689057A
    • 1997-11-18
    • US607753
    • 1996-02-27
    • Peter Michael BaumgartKarl A. FlechsigMichael Franklin LeeWing P. LeungUllal Vasant NayakThao Anh NguyenTimothy Christopher O'SullivanAndrew Ching Tam
    • Peter Michael BaumgartKarl A. FlechsigMichael Franklin LeeWing P. LeungUllal Vasant NayakThao Anh NguyenTimothy Christopher O'SullivanAndrew Ching Tam
    • B23K26/08G11B5/82G11B5/84G11B7/00G11B7/08G11B33/10G01B5/28
    • B82Y15/00B23K26/0823B82Y10/00G11B33/10G11B5/82G11B5/8404G11B5/8408Y10T29/49995
    • Crater shaped bumps are made on a calibration disk which can be used for calibrating a PZT slider, the PZT slider in turn being used for detecting predetermined asperities on a production run magnetic disk. The crater shaped bumps emulate predetermined asperities of production run magnetic disks and especially asperities which are undesirable and would cause the production run disk to be discarded after testing by the PZT slider. Crater shaped bumps which emulate undesirable asperities on current production runs of magnetic disks have a diameter in the range of 10 to 25 .mu.m and a peripheral ridge with a height h.sub.r above a nominal surface of the calibration disk in the range of 75 to 120 nm. Close tolerance crater shaped bumps with this configuration can be made by impinging two or more pulses of laser energy on the same location of a calibration disk. By increasing the number of pulses the height of the peripheral ridge progressively increases. By employing multiple pulses, the height of the peripheral ridge is increased while the diameter of the crater shaped bump stays substantially constant. Further, by employing multiple pulses diameters and heights of crater shaped bumps can be produced with close tolerances within a diameter range of 5 to 20 .mu.m and a height range of 2 to 120 nm. Different arrangements of the crater shaped bumps on a calibration disk are provided for increasing the range of calibration of the PZT slider.
    • 在可用于校准PZT滑块的校准盘上形成火山口形凸块,PZT滑块又用于检测生产运行磁盘上的预定凹凸。 火山口形凸起模拟生产运行磁盘的预定粗糙度,特别是不期望的粗糙度,并且会在PZT滑块测试后导致生产运行盘被丢弃。 在当前的磁盘生产运行中模拟不期望的粗糙度的火山口形凸起具有在10至25μm的范围内的直径和在校准盘的标称表面上的高度hr在75至120nm范围内的周边脊 。 可以通过在校准盘的相同位置上照射激光能量的两个或更多个脉冲来实现具有该配置的紧公差凹坑形状的凸块。 通过增加脉冲数,周边脊的高度逐渐增加。 通过采用多个脉冲,周边脊的高度增加,而凹坑形凸起的直径基本保持不变。 此外,通过使用多个脉冲,可以在5〜20μm的直径范围内和2〜120nm的高度范围内产生具有紧密公差的凹坑形凸起的高度。 提供校准盘上的凹坑形突起的不同布置,用于增加PZT滑块的校准范围。
    • 7. 发明授权
    • Magnetic disk stack having laser-bump identifiers on magnetic disks
    • 磁盘堆在磁盘上具有激光凸点标识符
    • US6118632A
    • 2000-09-12
    • US800097
    • 1997-02-12
    • Thomas Robert AlbrechtPeter Michael BaumgartThao Anh NguyenKurt Allen RubinAndrew Ching Tam
    • Thomas Robert AlbrechtPeter Michael BaumgartThao Anh NguyenKurt Allen RubinAndrew Ching Tam
    • G11B5/00G11B5/012G11B5/016G11B5/09G11B5/65G11B5/73G11B5/738G11B5/82G11B5/84G11B11/10G11B13/00G11B20/10G11B27/11G11B27/24
    • G11B5/012G11B27/11G11B27/24G11B5/82G11B2005/001G11B2220/20G11B2220/65
    • A magnetic disk with nonmagnetic information encoded under, in or above the magnetic layer of the disk is described along with the disk drive using the magnetic disks. The information may be stored as a series of laser-written marks (e.g., bumps, oxidized spots or spots with altered reflectivity) upon the surface(s) of each disk of the disk stack. The set of marks may be a series of laser bumps which serve a dual purpose as a landing zone or contact start/stop (CSS) zone for the slider and as encoded identifying information. During the manufacturing process for disk drives containing the disks, each disk's identifier can be read using outboard equipment such as an HRF tester or by means contained in the drive itself. Each disk identifier can then be stored magnetically in a special region of the hard disk reserved for use by the drive and/or within the flash memory of the hard drive. The drive can then communicate the identifier(s) to a host computer using the conventional communication hardware and firmware. In this way selected information such as the origin, batch number, date of manufacture, serial number, etc. of any disk can be obtained when needed as, for example, as part of failure analysis.
    • 与使用磁盘的磁盘驱动器一起描述在磁盘的磁性层下面或上方编码的具有非磁性信息的磁盘。 信息可以作为一系列激光写入的标记(例如,具有改变的反射率的凸起,氧化点或斑点)存储在盘堆叠的每个盘的表面上。 该组标记可以是一系列激光凸块,其作为滑块的着陆区域或接触开始/停止(CSS)区域和作为编码的识别信息的双重目的。 在包含磁盘的磁盘驱动器的制造过程中,可以使用诸如HRF测试仪之类的外部设备或驱动器本身包含的方式读取每个磁盘的标识符。 然后可以将磁盘的每个标识符磁性地存储在硬盘的特殊区域中,以供驱动器使用和/或在硬盘驱动器的闪存中使用。 然后,驱动器可以使用传统的通信硬件和固件将标识符传送到主计算机。 以这种方式,当需要时,例如作为故障分析的一部分,可以获得任何盘的原点,批号,制造日期,序列号等所选择的信息。
    • 10. 发明授权
    • Multiple channel acousto-optic modulators
    • 多声道声光调制器
    • US5963569A
    • 1999-10-05
    • US825305
    • 1997-03-28
    • Peter Michael BaumgartJames Hammond BrannonChie Ching PoonAndrew Ching Tam
    • Peter Michael BaumgartJames Hammond BrannonChie Ching PoonAndrew Ching Tam
    • G11B7/085G02F1/11G11B7/135G02F1/33H01S3/10
    • G02F1/113G02F1/332
    • A multichannel acousto-optic modulator (MCAOM) is described which uses a crystal with a plurality of mounting faces for acoustic transducers. The mounting faces are oriented so that the acoustic transducers mounted thereon generate acoustic fields which intersect the incident laser beam at a common angle, i.e., the Bragg angle. A two channel MCAOM uses two transducers. Extension to any higher number of channels follows accordingly. Energizing any of the transducers causes a corresponding first order beam to be diffracted out. Since the acoustic field for each transducer intersects the incident beam with a unique orientation, each first order beam is diffracted out on a unique axis. A system utilizing an MCAOM has electronic means for controlling the driving signals to the transducers to control each channel as required by the application. Amplitude and frequency modulation of the driving signals allows the intensity and angle of the beams to be controlled.
    • 描述了使用具有用于声学换能器的多个安装面的晶体的多声道声光调制器(MCAOM)。 安装面被定向成使得安装在其上的声学换能器产生以入射激光束以相同的角度即布拉格角相交的声场。 双通道MCAOM使用两个换能器。 扩展到任何更多数量的频道都是相应的。 激励任何一个换能器使相应的一阶光束被衍射。 由于每个传感器的声场以独特的取向与入射光束相交,所以每一个第一阶光束在独特的轴上被衍射。 使用MCAOM的系统具有用于控制到换能器的驱动信号的电子装置,以根据应用的要求来控制每个通道。 驱动信号的幅度和频率调制允许控制光束的强度和角度。