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51. 发明授权

US6021013A Timing based servo system for magnetic tape systems 失效
标题翻译：用于磁带系统的基于定时的伺服系统
公开(公告)号：US6021013A
公开(公告)日：2000-02-01
申请号：US865540
申请日：1997-05-29
申请人： Thomas Robert Albrecht , Robert Carl Barrett , James Howard Eaton
发明人： Thomas Robert Albrecht , Robert Carl Barrett , James Howard Eaton
IPC分类号： A63F7/02 , G11B5/265 , G11B5/58 , G11B5/584 , G11B5/596 , G11B21/10 , G11B5/09
CPC分类号： G11B5/584
摘要： A track following servo system is disclosed for use with magnetic tape systems in which magnetic servo track patterns contain transitions recorded at more than on azimuthal orientation across the width of the servo track. The timing of a signal derived from reading at any point across the servo track. The pattern is read by a servo read head whose width is small compared to the servo track pattern. The combination of a wide servo pattern and a narrow servo read head offers excellent position sensing linearity and dynamic range. In the preferred embodiment, the servo read head is also narrow with respect to the data tracks, which provides the additional advantages of superior immunity to position sensing errors caused by defects or temporal variations in the servo read head, defects in the servo pattern on the tape, wear of the head or tape, or debris collection on the head or tape. Position sensing with this system is achieved by deriving a ratio of two servo pattern intervals and therefore is insensitive to tape speed during reading. The servo patterns may include spacing intervals recognizable for error detection and correction purposes. Servo tracks are recorded using a patterned multiple gap servo write head whose magnetic gaps have geometries appropriate to generate the desired servo patterns. The patterned gaps of the servo write head are produced by photolithographically defined electroplating of permalloy on a ferrite ring head structure.
摘要翻译：磁带跟踪伺服系统被公开用于磁带系统，其中磁性伺服磁道模式包含跨过伺服磁道的宽度方向记录的转换。通过伺服轨道上的任何点读取信号的时序。通过与伺服磁道图形相比宽度小的伺服读取头来读取图案。宽伺服模式和窄伺服读头的结合提供出色的位置检测线性度和动态范围。在优选实施例中，伺服读取头相对于数据磁道也是窄的，这提供了对伺服读取头的缺陷或时间变化引起的位置检测错误的优异的抗扰性的额外优点，胶带，头部或胶带的磨损，或在头部或胶带上的碎屑收集。通过导出两个伺服模式间隔的比例来实现该系统的位置感测，因此在读取期间对磁带速度不敏感。伺服模式可以包括可识别用于错误检测和校正目的的间隔间隔。使用图案化的多间隙伺服写头来记录伺服磁道，其磁隙具有适于产生所需伺服模式的几何形状。伺服写入头的图案化间隙通过光刻定义的坡莫合金电镀在铁氧体环头部结构上产生。

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