专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

22. 发明授权

US5719719A Magnetic disk drive with sensing current adjustment of MR head 失效
标题翻译：磁头驱动器采用MR头的感应电流调节
公开(公告)号：US5719719A
公开(公告)日：1998-02-17
申请号：US207024
申请日：1994-03-07
申请人： Toshiaki Tsuyoshi , Futoshi Tomiyama
发明人： Toshiaki Tsuyoshi , Futoshi Tomiyama
IPC分类号： G11B5/00 , G11B5/012 , G11B5/09 , G11B5/39 , G11B5/03
CPC分类号： G11B5/09 , G11B5/012 , G11B2005/0016
摘要： A sensing current adjusting zone is formed in the outermost or innermost periphery of a magnetic disk and reference signals are recorded in a recording width corresponding to the width of a plurality of tracks in the sensing current adjusting zone so that the phases of the reference signals are the same and the radially adjacent reference signals overlap each other. When adjusting the sensing current, an MR head is moved forcibly into the sensing current adjusting zone to reproduce the reference signal and the sensing current is adjusted so that the difference between the respective absolute values of the plus peak and the minus peak of the reproduced reference signal is reduced to the least extent. Therefore, in a magnetic disk unit of a servo system or the like provided with an MR head for reproducing servo information, the sensing current to be supplied to the MR head can be adjusted to an optimum current, the sensing current can be correctly adjusted even in a process in which the servo system of the magnetic disk unit is unable to carry out positioning control. A feedback loop for sensing current adjustment is capable of always adjusting the sensing current to an optimum current even if the characteristics of the MR head varies with time.
摘要翻译：感测电流调节区形成在磁盘的最外周或最内周边，参考信号被记录在与感测电流调节区中的多个磁道的宽度对应的记录宽度中，使得参考信号的相位为相同和径向相邻的参考信号彼此重叠。当调整感测电流时，MR头被强制地移动到感测电流调节区域中，以再现参考信号，并且调整感测电流，使得再现基准的正峰值和负峰值的相应绝对值之间的差值信号减少到最小程度。因此，在设置有用于再现伺服信息的MR磁头的伺服系统等的磁盘单元中，可以将要提供给MR磁头的感测电流调整到最佳电流，甚至可以正确地调整感测电流在磁盘单元的伺服系统不能执行定位控制的过程中。用于感测电流调节的反馈回路能够总是将感测电流调整到最佳电流，即使MR磁头的特性随时间而变化。

IPRDB

热门服务

关于我们

友情链接

联系方式