公开(公告)号：US20090015961A1

公开(公告)日：2009-01-15

申请号：US12141338

申请日：2008-06-18

申请人： Tatsuharu Kusumoto

发明人： Tatsuharu Kusumoto

IPC分类号： G11B21/02

CPC分类号： G11B19/042 ,  G11B5/54 ,  G11B21/12

摘要： According to one embodiment, a disk drive (HDD) is installed in a portable electronic device. The HDD includes an actuator which supports a head such that the head is radially movable over a disk. A constant speed controller incorporated in the HDD executes constant speed control for unloading the head onto a ramp at a constant speed in accordance with a fall detection signal output from a fall detector and indicating that fall of the device has been detected. In the constant speed control, the controller drives a voice coil motor as a drive source for the actuator to make the movement speed of the head identical to a first target speed. The first target speed is set higher than a second target speed set when the head is unloaded onto the ramp in a normal state.

摘要翻译： 根据一个实施例，磁盘驱动器（HDD）安装在便携式电子设备中。 HDD包括致动器，该致动器支撑头部，使得头部可在盘上径向移动。 并入HDD中的恒速控制器根据从跌落检测器输出的跌倒检测信号，以恒定的速度将磁头卸载到斜坡上，并指示已检测到装置的跌落，执行恒速控制。 在恒速控制中，控制器驱动音圈电动机作为致动器的驱动源，使头部的移动速度与第一目标速度相同。 将第一目标速度设定为高于在正常状态下将磁头卸载到斜坡上时设定的第二目标速度。

公开(公告)号：US06765746B2

公开(公告)日：2004-07-20

申请号：US10091524

申请日：2002-03-07

申请人： Tatsuharu Kusumoto

发明人： Tatsuharu Kusumoto

IPC分类号： G11B2102

CPC分类号： G11B5/54 ,  G11B21/12

摘要： While a disk drive is operating, a retract time period, which is required for moving a head from its present position to a predetermined retract change position using a back EMF that occurs in an SPM, is determined. Upon power-off of a power supply for the disk drive, at first, a first retract operation for moving the head using the back EMF of the SPM is started. When the retract time period has elapsed after the power-off of the power supply, the first retract operation is switched to a second retract operation for moving the head onto a ramp using a charge accumulated in a retract capacitor.

摘要翻译： 当磁盘驱动器正在运行时，确定使用在SPM中发生的反EMF将磁头从其当前位置移动到预定的缩回改变位置所需的缩回时间段。 在电源关闭磁盘驱动器的电源时，首先，开始使用SPM的反电动势来移动磁头的第一缩回操作。 当在电源断电之后经过了缩回时间段时，第一缩回操作被切换到第二缩回操作，用于使用累积在后退电容器中的电荷将磁头移动到斜坡上。

公开(公告)号：US06894862B2

公开(公告)日：2005-05-17

申请号：US10653085

申请日：2003-09-03

申请人： Tatsuharu Kusumoto

发明人： Tatsuharu Kusumoto

IPC分类号： G11B21/08 ,  G11B5/596 ,  G11B21/10

CPC分类号： G11B5/59627

摘要： Disclosed herein is a servo system for performing head positioning control in a disk drive, thereby to move the head to a desired position on a disk. The servo system perform a learning operation, thereby calculating a learned value relating to a disk-runout, and effects servo compensation to suppress a disk-runout, by using the learned value. Further, the servo system abandons erases the learned value in a memory when an impact applied to the disk drive and exceeding a tolerance value is detected during the learning operation.

摘要翻译： 这里公开了一种用于在磁盘驱动器中执行磁头定位控制的伺服系统，从而将磁头移动到磁盘上的期望位置。 伺服系统执行学习操作，从而计算与磁盘跳动相关的学习值，并通过使用学习值来实现伺服补偿以抑制磁盘跳动。 此外，当在学习操作期间检测到施加到磁盘驱动器的冲击并超过公差值时，伺服系统放弃擦除存储器中的学习值。

公开(公告)号：US06760183B2

公开(公告)日：2004-07-06

申请号：US09955096

申请日：2001-09-19

申请人： Tatsuharu Kusumoto

发明人： Tatsuharu Kusumoto

IPC分类号： G11B5596

CPC分类号： G11B5/59627

摘要： A disk drive including a servo system that performs a learning operation for calculating a servo compensation value is disclosed. The servo system determines whether an initial learning value stored in a flash memory in advance is valid or invalid. When the initial learning value is valid, the servo system inhibits a normal learning operation from being performed. When the initial learning value is invalid, the servo system calculates a servo compensation value using the present learning value obtained by performing the learning operation.

摘要翻译： 公开了一种包括执行用于计算伺服补偿值的学习操作的伺服系统的盘驱动器。 伺服系统确定事先存储在闪速存储器中的初始学习值是否有效或无效。 当初始学习值有效时，伺服系统禁止执行正常的学习操作。 当初始学习值无效时，伺服系统使用通过执行学习操作获得的当前学习值来计算伺服补偿值。

公开(公告)号：US06496319B1

公开(公告)日：2002-12-17

申请号：US09382444

申请日：1999-08-25

申请人： Tatsuharu Kusumoto ,  Hidetoshi Kawachi

发明人： Tatsuharu Kusumoto ,  Hidetoshi Kawachi

IPC分类号： G11B2102

CPC分类号： G11B5/54 ,  G11B5/5534 ,  G11B5/5565

摘要： In a head loading/unloading type disk apparatus, accurate velocity feedback control is implemented by correcting any error in a VCM velocity detection value, which is caused by a temperature change or the like. At the start of loading control for loading a head from a ramp onto a disk, a carriage is pushed against an outer-periphery stopper to set the actual velocity of a VCM to zero. In this state, a VCM velocity detection value detected by a VCM velocity detection circuit is read out. On the basis of this velocity detection value, calibration for correcting the relationship between the VCM current value and the VCM velocity detection value is performed. In the period of head positioning control after the loading, an operation using a timer is periodically performed in which the carriage is pushed against an inner-periphery stopper, the calibration is reexecuted, and the head is returned to the original head position.

摘要翻译： 在磁头加载/卸载型盘装置中，通过校正由温度变化等引起的VCM速度检测值中的任何误差来实现精确的速度反馈控制。 在将头从斜坡装载到盘上的装载控制开始时，滑架被推到外周挡块上以将VCM的实际速度设置为零。 在该状态下，读取由VCM速度检测电路检测出的VCM速度检测值。 基于该速度检测值，进行用于校正VCM电流值与VCM速度检测值之间的关系的校准。 在加载后的头部定位控制期间，周期性地执行使用定位器的操作，其中滑架被推靠在内周止动器上，再次执行校准，并且头部返回到原始头部位置。

公开(公告)号：US07206158B2

公开(公告)日：2007-04-17

申请号：US11038049

申请日：2005-01-21

申请人： Tatsuharu Kusumoto

发明人： Tatsuharu Kusumoto

IPC分类号： G11B21/02

CPC分类号： G11B5/54 ,  G11B21/12

摘要： A reset circuit asserts a reset signal when at least a power-off detection signal or a drop detection signal is asserted. When the reset signal is asserted, an emergency unload circuit supplies a voice coil motor with a current for retracting the head to the retract area. The emergency unload circuit uses an auxiliary power supply as an operation power supply thereof.

摘要翻译： 当至少断电检测信号或丢失检测信号被断言时，复位电路断言复位信号。 当复位信号被断言时，紧急卸载电路为音圈电机提供电流以将头部缩回到缩回区域。 紧急卸载电路使用辅助电源作为其操作电源。

公开(公告)号：US20050264914A1

公开(公告)日：2005-12-01

申请号：US11038049

申请日：2005-01-21

申请人： Tatsuharu Kusumoto

发明人： Tatsuharu Kusumoto

IPC分类号： G11B5/54 ,  G11B21/02 ,  G11B21/12

CPC分类号： G11B5/54 ,  G11B21/12

摘要： A reset circuit asserts a reset signal when at least a power-off detection signal or a drop detection signal is asserted. When the reset signal is asserted, an emergency unload circuit supplies a voice coil motor with a current for retracting the head to the retract area. The emergency unload circuit uses an auxiliary power supply as an operation power supply thereof.

摘要翻译： 当至少断电检测信号或丢失检测信号被断言时，复位电路断言复位信号。 当复位信号被断言时，紧急卸载电路为音圈电机提供电流以将头部缩回到缩回区域。 紧急卸载电路使用辅助电源作为其操作电源。

公开(公告)号：US06661598B2

公开(公告)日：2003-12-09

申请号：US10222707

申请日：2002-08-15

申请人： Tatsuharu Kusumoto ,  Hidetoshi Kawachi

发明人： Tatsuharu Kusumoto ,  Hidetoshi Kawachi

IPC分类号： G11B2102

CPC分类号： G11B5/54 ,  G11B5/5534 ,  G11B5/5565

摘要： In a head loading/unloading type disk apparatus, accurate velocity feedback control is implemented by correcting any error in a VCM velocity detection value, which is caused by a temperature change or the like. At the start of loading control for loading a head from a ramp onto a disk, a carriage is pushed against an outer-periphery stopper to set the actual velocity of a VCM to zero. In this state, a VCM velocity detection value detected by a VCM velocity detection circuit is read out. On the basis of this velocity detection value, calibration for correcting the relationship between the VCM current value and the VCM velocity detection value is performed. In the period of head positioning control after the loading, an operation using a timer is periodically performed in which the carriage is pushed against an inner-periphery stopper, the calibration is reexecuted, and the head is returned to the original head position.

公开(公告)号：US06175465B1

公开(公告)日：2001-01-16

申请号：US09086529

申请日：1998-05-29

申请人： Hidetoshi Kawachi ,  Masahide Yatsu ,  Tatsuharu Kusumoto

发明人： Hidetoshi Kawachi ,  Masahide Yatsu ,  Tatsuharu Kusumoto

IPC分类号： G11B5596

CPC分类号： G11B5/59611 ,  G11B5/59655

摘要： A servo system uses a disk on which two pairs of burst data items A and B and burst data items C and D are prerecorded, and the servo system performs positioning control for positioning a head within a range of a track on a disk. The servo system sets a range of a track to be divided into a first area regarding the track center as a reference position, a second area regarding a boundary position between tracks as a reference position, and a third area regarding a middle position between the reference positions, as a reference position. In the first area, the servo system calculates position information of the head by a first calculation formula using the burst data items A and B. In the second area, the servo system calculates position information of the head by a second calculation formula using the burst data items C and D. Further, in the third area, the servo system calculates an average value of calculation results from the first and second calculation formulas, as position information.

摘要翻译： 伺服系统使用其上预先记录了两对突发数据项A和B以及突发数据项C和D的盘，并且伺服系统执行定位控制以将磁头定位在磁盘上的轨道的范围内。 伺服系统将要被分割成关于轨道中心的第一区域作为参考位置的轨道的范围，关于作为参考位置的轨道之间的边界位置的第二区域以及关于参考点之间的中间位置的第三区域 职位，作为参考。 在第一区域中，伺服系统使用突发数据项A和B以第一计算公式计算头部的位置信息。在第二区域中，伺服系统使用第二计算公式使用脉冲​​串来计算头部的位置信息 数据项C和D.此外，在第三区域中，伺服系统将来自第一和第二计算公式的计算结果的平均值计算为位置信息。

公开(公告)号：US06922302B2

公开(公告)日：2005-07-26

申请号：US10659218

申请日：2003-09-09

申请人： Tatsuharu Kusumoto ,  Hidetoshi Kawachi

发明人： Tatsuharu Kusumoto ,  Hidetoshi Kawachi

IPC分类号： G11B21/08 ,  G11B5/54 ,  G11B21/02 ,  G11B21/12

CPC分类号： G11B5/54 ,  G11B5/5534 ,  G11B5/5565

摘要： In a head loading/unloading type disk apparatus, accurate velocity feedback control is implemented by correcting any error in a VCM velocity detection value, which is caused by a temperature change or the like. At the start of loading control for loading a head from a ramp onto a disk, a carriage is pushed against an outer-periphery stopper to set the actual velocity of a VCM to zero. In this state, a VCM velocity detection value detected by a VCM velocity detection circuit is read out. On the basis of this velocity detection value, calibration for correcting the relationship between the VCM current value and the VCM velocity detection value is performed. In the period of head positioning control after the loading, an operation using a timer is periodically performed in which the carriage is pushed against an inner-periphery stopper, the calibration is reexecuted, and the head is returned to the original head position.

摘要翻译： 在磁头加载/卸载型盘装置中，通过校正由温度变化等引起的VCM速度检测值中的任何误差来实现精确的速度反馈控制。 在将头从斜坡装载到盘上的装载控制开始时，滑架被推到外周挡块上以将VCM的实际速度设置为零。 在该状态下，读取由VCM速度检测电路检测出的VCM速度检测值。 基于该速度检测值，进行用于校正VCM电流值与VCM速度检测值之间的关系的校准。 在加载后的头部定位控制期间，周期性地执行使用定位器的操作，其中滑架被推靠在内周止动器上，再次执行校准，并且头部返回到原始头部位置。