公开(公告)号：US5896239A

公开(公告)日：1999-04-20

申请号：US125311

申请日：1993-09-21

申请人： Shinichi Maki ,  Tatsuya Masuda ,  Kazunobu Tomiyama ,  Yoshihisa Matsumoto

发明人： Shinichi Maki ,  Tatsuya Masuda ,  Kazunobu Tomiyama ,  Yoshihisa Matsumoto

IPC分类号： G11B5/02 ,  G11B5/012 ,  G11B5/55 ,  G11B5/596 ,  G11B23/00 ,  G11B5/09

CPC分类号： G11B5/5526 ,  G11B5/012 ,  G11B23/0007 ,  G11B5/59605

摘要： A method and disk apparatus, for writing data disk apparatus, that reduces the adverse influence of noise caused by data head writing on a read signal of a servo head even though the data head and the servo head are collaterally paired with no disks there between. A magnetic disk apparatus comprises a plurality of magnetic disks that are stacked at predetermined intervals; a servo head for reading servo signals recorded on a servo surface of one of the magnetic disks; a plurality of data heads, one of which is provided for each data surface of the magnetic disks with a first data head being collaterally positioned with the servo head, with no intervening magnetic disk, and second data heads being positioned at other than the collateral position; and an actuator for supporting the servo head and the data heads and for positioning the servo head and the data heads by moving them radially relative to the magnetic disks. The method comprises the steps of: producing a write current whose value is varied by selecting either the first data head or one of the second data heads in consonance with a head select signal; and driving, at the write current value, the data head that is selected by the head select signal in consonance with write data. The magnetic disk apparatus further comprises a write circuit for varying a write current value by selecting either the first data head or one of the second data heads in consonance with a head select signal, and for driving the selected data head in consonance with write data.

摘要翻译： 即使数据磁头和伺服磁头与其间没有磁盘成对配对，也可以减少数据磁头写入对伺服磁头的读取信号造成的噪声的不良影响的方法和磁盘装置。 磁盘装置包括以预定间隔堆叠的多个磁盘; 用于读取记录在一个磁盘的伺服表面上的伺服信号的伺服头; 多个数据头，其中一个为磁盘的每个数据表面提供，第一数据头与伺服头相互定位，没有中间磁盘，第二数据磁头位于辅助位置之外 ; 以及用于支撑伺服头和数据头的致动器，并且用于通过相对于磁盘径向移动来定位伺服头和数据头。 该方法包括以下步骤：通过根据头部选择信号选择第一数据头或第二数据头之一来产生其值被改变的写入电流; 并以写入当前值驱动由头部选择信号选择的与写入数据相符合的数据头。 磁盘装置还包括写入电路，用于通过根据头部选择信号选择第一数据头或第二数据头中的一个来改变写入电流值，并且用于根据写入数据来驱动所选择的数据头。

公开(公告)号：US5165082A

公开(公告)日：1992-11-17

申请号：US403499

申请日：1989-09-06

申请人： Kazunobu Tomiyama

发明人： Kazunobu Tomiyama

IPC分类号： G11B5/596 ,  G11B20/12 ,  G11B21/10

CPC分类号： G11B5/59633 ,  G11B20/1217

摘要： Servo data to be stored on a servo disk in a magnetic recording apparatus for positioning a data head of the magnetic recording apparatus to a data disk of the magnetic recording apparatus, are formed in a train of four servo bytes arranged in accordance with four clock bits successively received. Each servo byte consists of a clock bit and a group of positional bits respectively, where the positional bit is set making a definite time space from the clock bit. The four definite time spaces of the corresponding positional bit in the four servo bytes make an arithmetic progression, in which the initial term is the definite time space of the positional bit in the first servo byte and the common difference is the time difference between two corresponding positional bits in two adjacent servo bytes. The time difference and a length of a gate pulse in which servo data signals are demodulated, are set, for example, to 20 ns and 160 ns, respectively.