Head mechanism control apparatus, disk drive unit, and method of

Details Head mechanism control apparatus, disk drive unit, and method of Head mechanism control apparatus, disk drive unit, and method of

1998-06-10

2000-10-31

Edun, Muhammad

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360105, G11B 2102

Patent

active

061411736

ABSTRACT:
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.

REFERENCES:
patent: 6025968 (2000-02-01), Albrecht

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