Automatic head retract system for disk drive

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

1986-11-06

1988-11-22

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360105, G11B 554, G11B 2112

Patent

active

047869950

ABSTRACT:
An automatic head retract system for a disk drive is disclosed which 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: 3629679 (1971-12-01), Halfhill
patent: 3634836 (1972-01-01), Huetten et al.
patent: 4188648 (1980-02-01), Guerini
patent: 4237501 (1980-12-01), Barmache et al.
patent: 4371903 (1983-02-01), Lewis
patent: 4658308 (1987-04-01), Sander, Jr.
patent: 4679102 (1987-07-01), Wevers et al.

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