Electricity: motive power systems – Positional servo systems – With protective or reliability increasing features
Patent
1993-05-14
1995-10-03
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
With protective or reliability increasing features
360 75, G11B 554, G11B 2102, G05B 902
Patent
active
054554969
ABSTRACT:
A moving media storage apparatus including a head actuator driven by flyback emf generated by a spindle motor. The spindle motor is driven by V.sub.BAT, whereas the head actuator includes a head-control circuit and an H-bridge MOSFET construction which is driven by V.sub.BAT or V.sub.CC during normal operation, and a head-retract circuit which is driven by V.sub.AUX after a battery failure. A pair of bipolar transistors are provided in the head actuator for increasing the amount of time V.sub.AUX is available to drive a head-retract procedure.
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Chang Allen A.
Concklin Barry J.
Williams Richard K.
Bever Patrick T.
Ro Bentsu
Siliconix incorporated
Steuber David E.
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