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1. 发明授权

US06469862B2 Method and apparatus for improved servo signal filtering in read channels 有权
标题翻译：在读通道中改进伺服信号滤波的方法和装置
公开(公告)号：US06469862B2
公开(公告)日：2002-10-22
申请号：US09260272
申请日：1999-03-02
申请人： Anatoli B. Stein , Ufuk Karaaslan , Ilia M. Bokchtein
发明人： Anatoli B. Stein , Ufuk Karaaslan , Ilia M. Bokchtein
IPC分类号： G11B5596
CPC分类号： G11B5/59611 , G11B5/012
摘要： A read channel network of a magnetic data storage device receives analog signals representative of user data and servo data, wherein the servo data is usable to position a read/write magnetic head. The servo data is separately processed within the read channel network to improve the signal to noise ratio of the user data signal and, thereby, permit improved positioning accuracy of the read/write head within the magnetic data storage device. The servo signal applied to a multiplier along with an oscillating signal reference signal to produce a sideband signal, which is passed through a bandpass filter having a bandwidth about that of the sideband signal and having a center frequency substantially the same as that of the sideband signal. Additionally, the signal output by the bandpass filter is processed by an envelope detector, and then by an A/D converter and digital filter to produce a digital signal representative of the servo signal.
摘要翻译：磁数据存储装置的读通道网络接收表示用户数据和伺服数据的模拟信号，其中伺服数据可用于定位读/写磁头。伺服数据在读通道网络内单独处理，以提高用户数据信号的信噪比，从而允许读/写磁头在磁数据存储装置内的改进的定位精度。伺服信号与振荡信号参考信号一起施加到乘法器以产生边带信号，该边带信号通过带宽约为边带信号带宽的带通滤波器，并具有与边带信号基本相同的中心频率。此外，由带通滤波器输出的信号由包络检测器处理，然后由A / D转换器和数字滤波器处理，以产生表示伺服信号的数字信号。

2. 发明授权

US06242910B1 Magnetic head and disk tester with yaw correction 失效
标题翻译：具有偏航校正的磁头和磁盘测试仪
公开(公告)号：US06242910B1
公开(公告)日：2001-06-05
申请号：US09241510
申请日：1999-02-01
申请人： Nahum Guzik , Cem Kilicci , Ilia M. Bokchtein , Ufuk Karaaslan
发明人： Nahum Guzik , Cem Kilicci , Ilia M. Bokchtein , Ufuk Karaaslan
IPC分类号： G11B548
CPC分类号： G11B5/4806 , G11B5/455 , G11B5/5552 , G11B5/56
摘要： A magnetic head and disk tester includes a magnetic head which is selectively positioned relative to a rotatably mounted magnetic disk to accomplish testing of either of the head or disk or both. The magnetic head is secured to a carriage which is under electro-mechanical control, wherein displacement of the carriage causes a corresponding displacement of the head relative to the disk and, to some degree, may cause yaw in the carriage. Measurements of the linear position of a left and a right side of the carriage are detected, measured, and fed back to a control system. The control system responds to a difference between a desired command position and the actual position of each side of the carriage and causes actuators to adjust the position of each side of the carriage until the difference, and thereby the yaw, is substantially eliminated. Additionally, during a positioning operation, vibrations in the yaw direction are decreased, which decreases a corresponding settling time of the magnetic head.
摘要翻译：磁头和磁盘测试器包括磁头，其相对于可旋转地安装的磁盘选择性地定位，以完成磁头或磁盘或两者的测试。磁头被固定在机电控制下的滑架上，其中滑架的位移导致磁头相对于磁盘的相应位移，并且在一定程度上可能导致滑架中的偏航。检测，测量并反馈到控制系统的滑架的左侧和右侧的线性位置的测量。控制系统响应期望的指令位置和滑架的每一侧的实际位置之间的差异，并且使致动器调节滑架的每一侧的位置，直到基本上消除了差异，从而偏航。此外，在定位操作期间，偏航方向的振动减小，这降低了磁头的相应的建立时间。

3. 发明授权

US6094047A Method and apparatus for balancing rotating components of a spinstand of a magnetic head and disk tester 失效
标题翻译：用于平衡磁头和磁盘测试仪的转台的旋转部件的方法和装置
公开(公告)号：US6094047A
公开(公告)日：2000-07-25
申请号：US982741
申请日：1997-12-02
申请人： Nahum Guzik , Ilia M. Bokchtein
发明人： Nahum Guzik , Ilia M. Bokchtein
IPC分类号： G01M1/38 , G11B5/455 , G11B17/038 , G11B25/04 , G11B33/08 , G11B33/10 , G11B33/12 , G11B17/02 , G11B17/04 , G11B17/08
CPC分类号： G11B33/121 , G11B17/038 , G11B25/043 , G11B33/08 , G11B33/10 , G11B5/455
摘要： An apparatus for balancing the spinstand of a magnetic head and disk testing system includes a base that rotationally supports a rotating spindle. The spindle supports a pack of disks and a slide moveable along guide rails of the spinstand. The slide, in turn, supports a stack of magnetic heads that is moveable in respect to the pack of disks. The spindle supports a balancing cap that has a plurality of threaded openings uniformly spaced in its peripheral surface. Imbalance is adjusted by threading screws into or out of the selected threaded openings. The value of imbalance is defined by vibration measurements; these measurements are performed by means of an accelerometer attached to the spindle housing, and of a rotary encoder that generates index pulse in a certain position of the spindle. In order to provide reliable measurements by means of the accelerometer, the spindle housing either can be fixed to test magnetic heads, or can be turned to a spring-loaded condition to increase sensitivity of the balancing procedure. Each time the disk pack is replaced, the system measures the amount of radial displacement of the screws in respective openings that is necessary to compensate the imbalance created by the new disk pack. The proposed balancing method includes manual or automated calibration procedure, automatic vibration measurements, and manual adjustment of the positions of screws in the balancing cap using the results of measurements.
摘要翻译：用于平衡磁头和磁盘测试系统的固定架的装置包括旋转地支撑旋转主轴的基座。主轴支撑一组磁盘和一个可沿着纺锤台的导轨移动的滑块。滑块又支持一堆可相对于一揽子磁盘移动的磁头。主轴支撑平衡盖，其具有在其外周表面上均匀间隔开的多个螺纹开口。通过将螺钉拧入或移出所选螺纹孔来调节不平衡。不平衡的值由振动测量定义; 这些测量通过附接到主轴壳体的加速度计和在主轴的特定位置产生索引脉冲的旋转编码器执行。为了通过加速度计提供可靠的测量，可以将主轴壳体固定在测试磁头上，或者可以转到弹簧加载状态，以提高平衡过程的灵敏度。每次更换磁盘组件时，系统将测量相应开口中的螺钉的径向位移量，以补偿新磁盘组件产生的不平衡所必需的量。所提出的平衡方法包括手动或自动校准程序，自动振动测量，以及使用测量结果手动调整平衡盖中的螺钉位置。

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