Voice coil motor driving circuit with retracting function

Details Voice coil motor driving circuit with retracting function Voice coil motor driving circuit with retracting function

1992-08-06

1994-06-28

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With protective or reliability increasing features

318560, 360105, G05B 902

Patent

active

053250303

ABSTRACT:
A voice coil motor driving circuit 10 with retracting function used in a disk drive unit for driving a read/write head by means of a voice coil motor VCM, comprising a voltage up-converter 12; a voice coil motor control circuit 16 for driving the voice coil motor during normal operation; a retract power source Vrr for supplying a retract current to the voice coil motor during head retract action; a retract control circuit 24 for allowing the retract current from the retract power source to the voice coil motor in response to a retract signal. The driving circuit also includes a capacitor C for providing an uninterrupted supply of voltage to the retract control circuit 24 during head retract action.

REFERENCES:
patent: 4807062 (1989-02-01), Onodera
patent: 4903157 (1990-02-01), Malek
patent: 5124867 (1992-06-01), Kitahori et al.

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