公开(公告)号：US5317461A

公开(公告)日：1994-05-31

申请号：US860015

申请日：1992-03-30

申请人： Terumitsu Okamoto ,  Tomoaki Nakamura

发明人： Terumitsu Okamoto ,  Tomoaki Nakamura

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

CPC分类号： G11B5/59611

摘要： A magnetic disk apparatus detects servo information on a magnetic disk which includes a plurality of concentric tracks which are provided with an alternate arrangement of data areas and servo areas. The apparatus includes a servo ID detecting circuit which generates a first detection signal when a servo area including an identification signal is detected and a data reproducing circuit which generates a second detection signal when read data pulses are detected on the signal reproduced from the magnetic disk. Sampling pulses are generated when the second detection signal indicates that the generation of read data pulses has terminated, while the first detection signal indicates the presence of the identification signal. The positional error of the magnetic head of the magnetic disk apparatus with respect to the target track of the magnetic disk is determined from the servo information of the signal reproduced from the magnetic disk in synchronism with the sampling pulses.

摘要翻译： 磁盘装置检测包括多个同心轨道的磁盘上的伺服信息，所述多个同心磁道设置有数据区域和伺服区域的替代布置。 该装置包括伺服ID检测电路，当检测到包括识别信号的伺服区域时产生第一检测信号，并且当在从磁盘再现的信号上检测到读数据脉冲时产生第二检测信号的数据再现电路。 当第二检测信号指示读数据脉冲的产生已经终止时产生采样脉冲，而第一检测信号指示存在识别信号。 根据与采样脉冲同步的从磁盘重放的信号的伺服信息，确定磁盘装置的磁头相对于磁盘的目标磁道的位置误差。

公开(公告)号：US5818803A

公开(公告)日：1998-10-06

申请号：US888683

申请日：1997-07-07

申请人： Tomoaki Nakamura ,  Terumitsu Okamoto

发明人： Tomoaki Nakamura ,  Terumitsu Okamoto

IPC分类号： G11B21/10 ,  G11B5/55 ,  G11B5/596 ,  G11B21/08 ,  G11B7/09

CPC分类号： G11B21/085 ,  G11B5/5534 ,  G11B5/5547 ,  G11B5/59605 ,  G11B5/59627 ,  G11B5/59622

摘要： After application of power or insertion of a medium, a frequency bandpass digital filter extracts the first-order component, which has one period per revolution of the medium, and the second-order component, which has two periods per revolution of the medium, from the carriage operation amount for one revolution of the medium, this being written into a carriage operation amount compensation table. Then, a position error averaging section calculates the average value of a tracking error signal, and a compensation table updating judgment section monitors this position error average value. If the position error average exceeds a prescribed threshold value for a number of consecutive sectors, the second-order component only is updated in the carriage operation amount compensation table. An actuator driving section controls the carriage in accordance with a corrected operation amount obtained by adding the operation amount obtained at the carriage operation amount calculation section and the compensation amount of the carriage compensation table. The results in stable position control of the head, without the influence of ambient temperature changes on the off-track amount.

摘要翻译： 在施加电力或插入介质之后，频带数字滤波器提取介质旋转一周期的一阶分量和介质旋转两圈的二阶分量 将介质一转的托架运算量写入托架运算量补偿表。 然后，位置误差平均部分计算跟踪误差信号的平均值，并且补偿表更新判断部分监视该位置误差平均值。 如果针对多个连续扇区的位置误差平均值超过规定的阈值，则仅在滑架运算量补偿表中更新二阶分量。 执行器驱动部根据通过将在滑架操作量计算部获得的操作量和滑架补偿表的补偿量相加而获得的校正操作量来控制滑架。 结果头部稳定的位置控制，不受环境温度变化影响离轨量。

公开(公告)号：US4972132A

公开(公告)日：1990-11-20

申请号：US410457

申请日：1989-09-21

申请人： Takamasa Kitano ,  Terumitsu Okamoto

发明人： Takamasa Kitano ,  Terumitsu Okamoto

IPC分类号： G11B21/10 ,  H02P8/12 ,  H02P8/32

CPC分类号： H02P8/32 ,  H02P8/12

摘要： A circuit for controllably and finely driving a stepping motor, which moves a magnetic head over a magnetic disk, by using the combination of current values which are individually approximated to a sine wave and a cosine wave. The circuit allows a magnetic head to move at a high speed across the tracks of a magnetic disk toward a desired track, while after such a movement of the head lowering the remaining oscillation frequency of the stepping motor to allow servo to be applied immediately, thereby enhancing rapid operations of the apparatus.

摘要翻译： 通过使用分别接近正弦波和余弦波的电流值的组合，可控地并且精细地驱动使磁头在磁盘上移动的步进电机的电路。 该电路允许磁头高速地移动到磁盘的轨道上朝向期望的轨道，而在磁头的这种移动降低了步进电机的剩余振荡频率之后，允许立即施加伺服， 增强设备的快速操作。

公开(公告)号：US5053899A

公开(公告)日：1991-10-01

申请号：US219545

申请日：1988-07-15

申请人： Yoshihisa Okawa ,  Terumitsu Okamoto

发明人： Yoshihisa Okawa ,  Terumitsu Okamoto

IPC分类号： G11B5/55

CPC分类号： G11B5/5547

摘要： For controlling a relative position between a magnetic head (15) and a recording medium (10) having a control area (14) indicative of a tracking axis for the magnetic head, a position controlling unit comprises a producing arrangement (28) for producing a position signal, and a control arrangement (29) for controlling the relative position in response to the position signal in a predetermined direction which intersects the tracking axis. More particularly, the producing arrangement comprises a first producing, a second producing, and a processing arrangements (31, 32, 33). Responsive to the detection signal, the first producing arrangement produces a first signal. The processing arrangement processes the first signal into a second signal. Responsive to the first and the second signals, the second producing arrangement produces the position signal. Preferably, the control area has a main area (17) indicative of the tracking axis, and a supplementary area (18) preceding the main area. The magnetic head is for detecting the main and the supplementary areas to produce a main and a supplementary detection signal which collectively serves as the detection signal.

公开(公告)号：US5523683A

公开(公告)日：1996-06-04

申请号：US360113

申请日：1994-12-20

申请人： Terumitsu Okamoto ,  Takeshi Ikemoto

发明人： Terumitsu Okamoto ,  Takeshi Ikemoto

IPC分类号： G01B7/00 ,  G01D5/20 ,  G01D5/245 ,  G11B21/08 ,  G01B7/14 ,  G01B7/30

CPC分类号： G01D5/2073

摘要： In an induction sensor for sensing the displacement of a movable body by electromagnetic induction, a scaler and a slider are each implemented as a hollow cylinder consisting of a plurality of conductors in the form of a coil. The conductors of each of the scaler and slider alternate with each other in a displacement sensing direction. The sensor can be assembled with a minimum of fine adjustment, eliminates wasteful areas, and provides the slider with high sensing accuracy without increasing currents to flow through the scaler.

摘要翻译： 在用于通过电磁感应感测移动体的位移的感应传感器中，定标器和滑块各自被实现为由线圈形式的多个导体组成的中空圆筒。 每个定标器和滑块的导体在位移感测方向上彼此交替。 该传感器可以进行最少的精细调整，消除浪费的区域，并提供高灵敏度的滑块，而不会增加电流流过定标器。