A dual-stage magnetic disk drive actuator using a piezoelectric device for a high track density

Author

Mori, K. ; Munemoto, T. ; Otsuki, H. ; Yamaguchi, Y. ; Akagi, K.

Author_Institution

Hitachi Ltd., Ibaraki, Japan

Volume

27

Issue

6

fYear

1991

fDate

11/1/1991 12:00:00 AM

Firstpage

5298

Lastpage

5300

Abstract

A dual-stage actuator has been developed using a piezoelectric device for a magnetic disk drive with a high track density over 15 kTPI. This actuator uses a VCM (voice coil motor) rotary actuator as a coarse actuator and a piezoelectric actuator installed in a head-arm as a fine actuator. The stroke of the fine actuator is 4.6 μm, which is sufficient for a track pitch of 1.5 μm at 17 kTPI. The head position is detected by an optical method using a dot-pattern etched on a disk. The authors describe the design of the dual-stage actuator, including structural analysis, its static and dynamic characteristics, the dual-stage feedback control system. Experimental results of tracking with high accuracy on a 3.5-in disk-drive unit are presented

Keywords

electric actuators; feedback; hard discs; magnetic recording; piezoelectric devices; servomechanisms; design; dot-pattern; dual-stage feedback control system; dual-stage magnetic disk drive actuator; dynamic characteristics; head position; high track density; optical method; piezoelectric device; rotary actuator; static characteristics; structural analysis; tracking with high accuracy; voice coil motor; Coils; Disk drives; Etching; Magnetic devices; Magnetic heads; Optical detectors; Optical feedback; Piezoelectric actuators; Piezoelectric devices; Pneumatic actuators;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.278818

Filename

278818