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1. 发明授权

US4414589A Embedded servo track following system and method for writing servo tracks 失效
标题翻译：嵌入式伺服跟踪系统和写入伺服磁道的方法
公开(公告)号：US4414589A
公开(公告)日：1983-11-08
申请号：US330855
申请日：1981-12-14
申请人： Theodore A. Oliver , David L. Nelson , Keat-Lye Chan
发明人： Theodore A. Oliver , David L. Nelson , Keat-Lye Chan
IPC分类号： G11B21/10 , G11B5/012 , G11B5/596 , G11B5/55 , G11B5/58 , G11B23/36 , G11B27/36
CPC分类号： G11B5/5965 , G11B5/012 , G11B5/59616
摘要： A servo track following system for positioning a moving read/write head relative to a magnetic storage disc. A plurality of servo tracks are recorded in sectors on the disc for identifying radial positions or informational tracks. The servo tracks have a nonuniform radial track density varying from more dense at the periphery of the disc to less dense at the interior, established with a method that allows the unique performance characteristics of the head to determine the actual spacing of the tracks. A clock track is written by writing a single pulse on a fixed clock track head, phase-lock looping to an intermediate clock track, which is written on a moving head, and then phase-lock looping up to the final clock track which is written on the fixed clock track head. Radial track density is then determined by moving a head to a limit stop and writing a reference track. Thereafter, the head is displaced an amount sufficient to reduce the amplitude of the reference track by a predetermined percentage which is related to the ultimate average track density. Thereafter, another reference track is written and the head is again stepped away from the second reference track an amount sufficient to again reduce the amplitude of the reference track by a predetermined percentage. This is continued until the disc is filled with reference tracks. If the average track density thus achieved is unsatisfactory, the reduction number is adjusted and the process is repeated. Once the correct reduction number is determined for a predetermined average track density, the servo tracks are written by alternatively writing servo and reference in alternating servo and informational sectors. The reduction number is used to determine the pitch of all tracks.
摘要翻译：一种用于相对于磁存储盘定位移动的读/写头的伺服跟踪系统。多个伺服磁道被记录在盘上的扇区中用于识别径向位置或信息轨迹。伺服轨道具有不均匀的径向轨道密度，从盘的周边处的密度变化到内部的较不密集，通过允许头部的独特性能特性来确定轨道的实际间距的方法来建立。通过在固定时钟轨道头上写入单个脉冲，将相位锁定循环到写入移动头的中间时钟轨道，然后锁相循环到写入的最后时钟轨迹来写入时钟轨迹在固定的时钟轨道头上。然后通过将头移动到限位停止并写入参考轨道来确定径向轨道密度。此后，头部移动足以使参考轨道的振幅减小与最终平均轨道密度相关的预定百分比的量。此后，写入另一个参考轨道，并且头部再次从第二参考轨道步行到足以将参考轨道的幅度再次减小预定百分比的量。这一直持续到光盘充满参考轨。如果这样实现的平均轨道密度不能令人满意，则调整减少次数并重复该过程。一旦对于预定的平均轨道密度确定了正确的减小数，则通过在交替的伺服和信息扇区中交替地写入伺服和参考来写入伺服轨迹。缩小数用于确定所有轨道的间距。

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