Automatic head retract system for disk drive

Details Automatic head retract system for disk drive Automatic head retract system for disk drive

1988-07-25

1989-09-12

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

360 75, G11B 2102, G11B 554

Patent

active

048665541

ABSTRACT:
An automatic head retract system for a disk drive. The system operates in response to electric power turn off to retract the heads to a landing zone on the disk surface. The heads are retracted by operating a positioner motor under the control of logic internal to the disk drive unit without intervention by a host computer. The positioner motor comprises a multiphase DC brushless motor which, after power loss, is supplied with current from a capacitor charged during normal drive usage, and by the back EMF of a spindle motor. A latch mechanically locks the heads in the landing zone.

REFERENCES:
patent: 4371903 (1983-02-01), Lewis
patent: 4375070 (1983-02-01), Isozaki et al.
patent: 4786995 (1988-11-01), Stupeck et al.

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