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1.发明授权Apparatus and method for shifting a head movable relative to a carrier for recorded information 失效用于移动相对于载体移动的头的记录信息的装置和方法
公开(公告)号：US4166970A
公开(公告)日：1979-09-04
申请号：US753809
申请日：1976-12-23
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。
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公开(公告)号：US4151571A
公开(公告)日：1979-04-24
申请号：US765058
申请日：1977-02-02
CPC分类号： G11B27/105 , G11B2220/20
摘要： Binary coded address information is written by a magnetic head on a magnetic recording medium, such as a disc, as a plurality of tracks, each having an address associated with it. Each track includes a reference zone containing a plurality of individual cells equal to the number of bits in the address. Each cell represents a binary value and includes two binary state transitions, each of which can occur at one of only two positions. One transition of each cell in each zone occurs at the same position within the cell, with adjacent zones having alternating positions of this transition. The other transition in the cells in each zone occurs at either position to represent the binary values.
摘要翻译： 二进制编码地址信息由磁头写在磁记录介质（例如盘）上，作为多个轨道，每个轨道具有与其相关联的地址。 每个轨道包括包含等于地址中的比特数的多个单独小区的参考区域。 每个单元格表示一个二进制值，并包括两个二进制状态转换，每个都可以在两个位置之一中进行。 每个区域中的每个单元的一个转变发生在单元内的相同位置，相邻区域具有该转变的交替位置。 每个区域中的单元格中的其他转换发生在任一位置以表示二进制值。
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3.发明授权Method of reading addresses on a magnetic recording medium and apparatus for putting it into effect 失效读取磁记录介质上的地址的方法和使其生效的装置
公开(公告)号：US4134138A
公开(公告)日：1979-01-09
申请号：US765057
申请日：1977-02-02
CPC分类号： G11B27/105
摘要： Items of information written in a binary code on a plurality of magnetic c tracks are read by a magnetic head. The address for each track is written in a reference zone having a plurality of cells equal to the number of bits in the address. A constant frequency cyclic reference signal H is divided by logic pulses from the head to produce a signal SYNCHRO. The bit of each address is determined by combining the SYNCHRO signals and a pulse representative of the binary value of each bit that depends on the temporal position of a pulse within a period of signal SYNCHRO. The number of cells is counted, each time a bit is determined. The address is sampled bit by bit and transferred to a storage member throughout the counting and sampling operations.
摘要翻译： 通过磁头读取以多个磁盘轨道上的二进制代码写入的信息项。 每个轨道的地址被写入具有等于地址中的位数的多个单元的参考区域。 恒定频率循环参考信号H被来自磁头的逻辑脉冲除以产生信号SYNCHRO。 每个地址的位通过组合SYNCHRO信号和表示取决于信号SYNCHRO的周期内的脉冲的时间位置的每个位的二进制值的脉冲来确定。 计数单元数，每次确定一个位。 在整个计数和采样操作期间，地址被逐位采样并传输到存储器件。
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