公开(公告)号：US4166970A

公开(公告)日：1979-09-04

申请号：US753809

申请日：1976-12-23

申请人： Claude R. Cardot ,  Gerard E. Democrate ,  Jacques P. Droux ,  Andre J. Oisel ,  Guy Prival

发明人： Claude R. Cardot ,  Gerard E. Democrate ,  Jacques P. Droux ,  Andre J. Oisel ,  Guy Prival

IPC分类号： G11B5/55 ,  G11B17/00 ,  G11B21/08 ,  G11B21/10 ,  G11B27/10 ,  G05B13/00

CPC分类号： G11B17/005 ,  G11B21/081

摘要： A read/write head moves relative to magnetic discs having track addresses corded thereon in Gray code in a plurality of reference zones. The head is moved by an electric motor and reads information as the head is shifted from a starting track to a destination track. The address of the destination track is expressed in weighted, i.e., standard, binary code, and is stored in a register. The address of the head is read by a read element of the head from the recording tracks. In response to the initial and destination tracks, an intermediate track C, approximately halfway between the initial and destination tracks, is calculated. The head is accelerated from the initial track to the intermediate track by feeding a motor for driving the head with a constant current. In response to the head detecting the address of the intermediate track, the current supplied to the motor is reversed so that the head is decelerated. The calculations and comparisons are performed in the weighted, binary code. The reverse polarity current is applied to the motor until the speed of the head, as determined exclusively in response to addresses read by the head, is lower than a minimum threshold. In response to the speed of the head being detected as less than the minimum threshold, the flow of current to the motor is cut off, at which time the address of the track is compared with the destination track. In response to these two addresses differing, the sequence of steps is repeated.

摘要翻译： 读/写头相对于在多个参考区中以格雷码记录的具有轨道地址的磁盘移动。 头部被电动机移动，并且当头部从起始轨道移动到目的地轨迹时读取信息。 目标磁道的地址以加权的，即标准的二进制码表示，并存储在寄存器中。 头部的地址由记录轨道的头部的读取元件读取。 响应于初始轨道和目的地轨道，计算大约在初始轨迹和目的轨道之间的中间轨道C。 通过馈送用于以恒定电流驱动头部的电动机，头部从初始轨道加速到中间轨道。 响应于头部检测中间轨道的地址，提供给电动机的电流反转，使得磁头减速。 计算和比较在加权二进制代码中执行。 反向极性电流被施加到电动机，直到专门根据头部读取的地址确定的头部的速度低于最小阈值。 响应于检测到的磁头的速度小于最小阈值，切断到电动机的电流，此时将磁道的地址与目的磁道进行比较。 响应于这两个地址不同，重复步骤的顺序。