公开(公告)号：US6141173A

公开(公告)日：2000-10-31

申请号：US095506

申请日：1998-06-10

申请人： Nobuyuki Kitazaki ,  Yoshiro Amano ,  Kenjo Ogasawara ,  Shinji Ueno

发明人： Nobuyuki Kitazaki ,  Yoshiro Amano ,  Kenjo Ogasawara ,  Shinji Ueno

IPC分类号： G11B21/12 ,  G11B21/02

CPC分类号： G11B21/12

摘要： The present invention is an apparatus and method to reliably unload a head slider from a recording medium. Transistor Tr5 is on. If the main power supply Vdd is turned off at time t1, Tr1, Tr2, and D1 are turned off and the level of the control signal Ret becomes higher than the threshold voltage Vth of Tr3 and Tr4, turning on Tr3 and Tr4. C1 also starts to discharge. The control signal InRet changes to a "L"-level, and the control signal OutRet remains to be at the "L"-level. This allows the IR driver to feed a negative-polarity VCM current through the voice coil to preliminarily move the head arm in the direction opposite to the unload direction. Then, at time t2 when the level of Ret becomes equal to or lower than Vth, both InRet and OutRet change to a "H"-level, the IR driver becomes inoperative, and the OR driver feeds a positive-polarity VCM current through the voice coil to reverse the moving direction of the head arm.

摘要翻译： 本发明是一种从记录介质上可靠地卸载磁头滑块的装置和方法。 晶体管Tr5导通。 如果在时间t1断开主电源Vdd，则Tr1，Tr2和D1关闭，并且控制信号Ret的电平变得高于Tr3和Tr4的阈值电压Vth，打开Tr3和Tr4。 C1也开始放电。 控制信号InRet变为“L”级，控制信号OutRet保持为“L”级。 这允许IR驱动器通过音圈馈送负极性的VCM电流，以便在与卸载方向相反的方向上预先移动头臂。 然后，在Ret的电平等于或等于Vth的时刻t2，InRet和OutRet均变为“H”电平，IR驱动器变为不工作，OR驱动器通过该驱动器馈送正极性VCM电流 音圈反转头臂的移动方向。