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公开(公告)号：EP0141499A1
公开(公告)日：1985-05-15
申请号：EP84305943.7
申请日：1984-08-30
申请人： MEMOREX CORPORATION
CPC分类号： G11B21/085 , G11B5/59688 , G11B21/106
摘要： Shown is a disk drive arrangement with servomechanism for controlling (thin film) head position, etc.; the servo having a disk face dedicated to servo tracks, rendered in "Quad" code, with special timing indicia to separate position indicia.
A feature is a technique for deriving and using "offset" values for an array of servo tracks.摘要翻译： 显示了具有用于控制（薄膜）头位置等的伺服机构的磁盘驱动装置; 伺服具有专用于伺服轨道的盘面，以“Quad”代码呈现，具有特殊的时间标记以分离位置标记。 特征是用于导出和使用伺服轨道阵列的“偏移”值的技术。
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公开(公告)号：EP0139531A3
公开(公告)日：1987-04-22
申请号：EP84307200
申请日：1984-10-19
申请人： MEMOREX CORPORATION
IPC分类号： G11B05/596 , G11B21/10 , G05B05/01 , G05D03/00
CPC分类号： G05D3/14 , G11B5/59622 , G11B21/106 , H03H11/1217
摘要： Described is a novel technique and associated arrangement for determining the noise-free value of a system parameter (e.g., head position in a disk drive) which is time variable and (usually) has a noise component as detected. The technique involves processing the (as detected) noise-including value and passing it through "Second Order/ Summing" filter means. For instance, the technique is described as particularly useful with the "track-following servo" (part of the transducer positioning means) in a high density disk file (where track density is higher than usual) to secure superior head- displacement error values which are more noise-free. Thus, (see Figure 4), a pair of first values V 8 , V b are secured by detecting motor current sense voltage V i , integrating it with respect to time and passing the result through a pair of novel "second order filter" means - one hand-pass (F 1 ), the other low-pass (F 2 ); while also securing a third value V c by detecting position error (signal voltage, including noise components) in the usual manner and passing it through a "second order low-pass" filter F 3 ; then algebraically summing these to secure a relatively noise-free position error signal V xo Thus, the summing filter array gates the position-error voltage but attenuates the (mechanical) noise component (cf. filters F 2 , F 1 centered at w o - e.g., 600 Hz is satisfactory here). Such "second order" filters are novel in themselves, and particularly as so applied (most especially as so-used in such a servo system).
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