公开(公告)号：US5311379A

公开(公告)日：1994-05-10

申请号：US766399

申请日：1991-09-27

申请人： Tohru Shinohara ,  Shuichi Hashimoto

发明人： Tohru Shinohara ,  Shuichi Hashimoto

IPC分类号： G11B21/10 ,  G11B5/55 ,  G11B5/596

CPC分类号： G11B5/5547

摘要： A method of positioning a magnetic head on a target cylinder of a magnetic disk uses a position signal derived from a servo signal which is read from a magnetic disk using a magnetic head. The servo signal includes at least first and second servo signal components on even cylinders of the magnetic disk and includes at least third and fourth servo signal components on odd cylinders of the magnetic disk. The position signal is used for moving the magnetic head to a desired cylinder. The method comprises the steps of obtaining a first position signal for positioning the magnetic head to an odd cylinder on the magnetic disk based on a difference between peak values of the first and second servo signal components, obtaining a second position signal for positioning the magnetic head to an even cylinder on the magnetic disk based on a difference between peak values of the third and fourth servo signal components, and using only one of the first and second position signals to position the magnetic head to the target cylinder depending on a cylinder address of the target cylinder.

摘要翻译： 将磁头定位在磁盘的目标气缸上的方法使用从使用磁头从磁盘读取的伺服信号导出的位置信号。 伺服信号在磁盘的偶数圆柱上至少包括第一和第二伺服信号分量，并且在磁盘的奇数圆柱上包括至少第三和第四伺服信号分量。 位置信号用于将磁头移动到所需的气缸。 该方法包括以下步骤：基于第一和第二伺服信号分量的峰值之间的差，获得用于将磁头定位到磁盘上的奇数圆柱的第一位置信号，获得用于定位磁头的第二位置信号 基于第三和第四伺服信号分量的峰值之间的差异，并且仅使用第一和第二位置信号中的一个将磁头定位到目标圆柱体，根据圆柱体地址 目标气缸。

公开(公告)号：US5724204A

公开(公告)日：1998-03-03

申请号：US237404

申请日：1994-05-02

申请人： Tohru Shinohara ,  Shuichi Hashimoto

发明人： Tohru Shinohara ,  Shuichi Hashimoto

IPC分类号： G11B20/10 ,  G11B5/55 ,  G11B5/596 ,  G11B19/04 ,  G11B20/00 ,  G11B20/14 ,  G11B21/08

CPC分类号： G11B21/083 ,  G11B19/04 ,  G11B5/5526 ,  G11B5/5547 ,  G11B5/59616

摘要： An apparatus and a method of reproducing a synchronization signal in a disc storage system. The apparatus includes disc mechanism having a plurality of information storage discs in one of which a predetermined servo pattern is recorded, and a corresponding plurality of reproducing heads, one of the heads reading the servo pattern from the corresponding disc to thereby output a servo signal, a synchronization signal demodulating unit, responsive to the servo signal from the disc mechanism, for demodulating a synchronization signal in synchronization with a rotation of the discs, a synchronization clock generating unit for generating a clock signal with a predetermined frequency in synchronization with the synchronization signal, and a gate unit. For a predetermined period, the gate unit prohibits a supply of the synchronization signal from the synchronization signal demodulating unit to the synchronization clock generating unit. As a result, it is possible to prevent an erroneous detection of a synchronization signal due to a spike noise, an undesirable signal by a defect of a medium, or the like, and thus realize a precise reproducing of the synchronization signal.

摘要翻译： 一种在盘存储系统中再现同步信号的装置和方法。 该装置包括具有多个信息存储盘的盘机构，其中一个记录有预定的伺服模式，以及相应的多个再现头，其中一个读头从对应的盘读取伺服模式，从而输出伺服信号， 同步信号解调单元，响应于来自盘机构的伺服信号，用于与盘的旋转同步地解调同步信号;同步时钟产生单元，用于与同步信号同步地产生具有预定频率的时钟信号 ，以及门单元。 在预定时间段内，门单元禁止从同步信号解调单元向同步时钟发生单元提供同步信号。 结果，可以防止由于尖峰噪声引起的同步信号的错误检测，由于介质的缺陷导致的不期望的信号等，从而实现了同步信号的精确再现。

公开(公告)号：US5194798A

公开(公告)日：1993-03-16

申请号：US460668

申请日：1990-01-03

申请人： Shuichi Hashimoto ,  Tohru Shinohara

发明人： Shuichi Hashimoto ,  Tohru Shinohara

IPC分类号： G11B5/55 ,  G11B7/085 ,  G11B21/08

CPC分类号： G11B7/08535 ,  G11B21/085 ,  G11B5/5547

摘要： A control system for a servo circuit has a speed control unit for controlling the speed of a servo object, a position control unit for controlling the position of the servo object, a switching unit for switching between the speed control unit and the position control unit, a main control unit, and optionally a speed zero detection circuit which compares the real speed and a slice level and detects if the real speed is less than a fixed value. The control system includes a method for producing a target speed using an amount of movement X in an amount of movement d as a remaining amount of movement, and producing a target speed of equal speed for a remaining amount of movement Y. Another method includes controlling the switching of position control of the servo circuit, determining if the conditions for switching to position control are met during speed control, monitoring conditions for switching for a fixed time X after detection of the switching conditions, switching position control when the switching conditions are met for the fixed time X, and returning to determine the switching conditions in accordance with the collapse of switching conditions within the fixed time. An additional method includes outputting a target speed using an amount of movement X as a remaining amount of movement, outputting a target speed of an equal speed of a remaining amount of movement Y, and switching the value of the slice level during the start of movement and after the movement.

公开(公告)号：US5204932A

公开(公告)日：1993-04-20

申请号：US460651

申请日：1990-01-03

申请人： Tohru Shinohara ,  Shuichi Hashimoto

发明人： Tohru Shinohara ,  Shuichi Hashimoto

IPC分类号： G11B5/55 ,  G11B21/08

CPC分类号： G11B21/085 ,  G11B5/5547

摘要： A servo circuit for a magnetic disk apparatus includes a target speed generating circuit which generates a target speed in accordance with an amount of movement. A speed signal producing circuit produces a real speed from a position signal from a servo object. A speed error generating circuit controls the speed of the servo object based on an error between the target speed and the real speed. Acceleration and deceleration control are performed to position the servo object at the target position. An acceleration detection circuit detects acceleration and outputs an acceleration-in-progress detection signal for changing a cut-off frequency of the speed error generating circuit between acceleration and deceleration. The servo circuit has a servo loop which supplies a seek current based on an error signal between a target speed and real speed to a voice coil motor and performs speed control on a head carriage. An addition circuit adds a predetermined addition value to the error signal during acceleration after the speed control starts. An amplifier determines the frequency characteristics of the servo loop. A gain switching circuit switches a preset gain to a larger gain between the start of a seek operation and the completion of acceleration. A speed signal generating circuit generates the real speed of the servo object based on a position signal of the servo object. A band changing circuit changes the band of a speed signal producing circuit in accordance with a seek difference.

摘要翻译： 用于磁盘装置的伺服电路包括目标速度产生电路，其根据移动量产生目标速度。 速度信号产生电路根据来自伺服对象的位置信号产生实际速度。 速度误差发生电路根据目标速度和实际速度之间的误差来控制伺服对象的速度。 执行加速和减速控制以将伺服对象定位在目标位置。 加速度检测电路检测加速度并输出用于改变加速和减速之间的速度误差产生电路的截止频率的加速进行中检测信号。 伺服电路具有伺服回路，其基于目标速度和实际速度之间的误差信号向音圈马达提供寻道电流，并对头托架进行速度控制。 加法电路在速度控制开始后的加速期间向误差信号添加预定的相加值。 放大器确定伺服环路的频率特性。 增益切换电路在寻找操作开始和加速完成之间将预设增益切换到更大的增益。 速度信号发生电路根据伺服对象的位置信号产生伺服对象的实际速度。 频带改变电路根据寻道差改变速度信号产生电路的频带。

公开(公告)号：US5070420A

公开(公告)日：1991-12-03

申请号：US443367

申请日：1989-11-30

申请人： Tohru Shinohara ,  Hiroshi Tsurumi

发明人： Tohru Shinohara ,  Hiroshi Tsurumi

IPC分类号： G11B21/02 ,  G11B5/54 ,  G11B19/20 ,  H02P25/06

CPC分类号： G11B19/20 ,  G11B5/54

摘要： A magnetic disk drive which releases adhesion between a magnetic head and a magnetic disk by radially moving the head before the disk begins to rotate. The head movement is accomplished by compressing an elastic stopper by driving a head actuator motor with drive current which flows at half of the voltage previously applied to a motor drive circuit. This is accomplished by grounding one terminal of the motor and forcing all of the motor drive transistors OFF except for one transistor in the motor drive circuit. This provides the benefit that smaller and cheaper transistors can be used and power consumption is considerably reduced, thus contributing to a smaller, cheaper drive circuit which consumes less power.

公开(公告)号：US5831783A

公开(公告)日：1998-11-03

申请号：US632009

申请日：1996-04-15

申请人： Tohru Shinohara

发明人： Tohru Shinohara

IPC分类号： G11B5/09 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/39 ,  G11B5/40 ,  G11B5/56 ,  G11B5/58 ,  G11B19/04 ,  G11B20/00

CPC分类号： G11B19/04 ,  G11B5/012 ,  G11B5/02 ,  G11B5/40 ,  G11B20/00 ,  G11B2005/0016

摘要： A power source control circuit prevents a generation of a spark between a magnetic head and a magnetic disk by accurately controlling an electric potential provided to the magnetic head. A signal processing circuit provides to the magnetic head an intermediate electric potential between a positive source voltage and a negative source voltage supplied by a power source unit. A first circuit provides the positive and negative source voltages to the signal processing circuit. A second circuit controls one of the positive and negative source voltages in response to a reference voltage fed back from the signal processing circuit. The reference voltage is provided from the signal processing circuit to the magnetic head for setting the head at the intermediate electric potential.

摘要翻译： 电源控制电路通过精确地控制提供给磁头的电位来防止在磁头和磁盘之间产生火花。 信号处理电路向磁头提供由电源单元提供的正电源电压和负电源电压之间的中间电位。 第一电路向信号处理电路提供正和负电源电压。 响应于从信号处理电路反馈的参考电压，第二电路控制正电源电压和负电源电压之一。 参考电压从信号处理电路提供给磁头，用于将磁头设置在中间电位。