Piezoelectric piggy-back microactuator for hard disk drive

Author

Soeno, Yoshikazu ; Ichikawa, Shinji ; Tsuna, Takamitsu ; Sato, Yoshikazu ; Sato, Isamu

Author_Institution

Adv. Prod. Dev. Center, TDK Corp., Chiba, Japan

Volume

35

Issue

2

fYear

1999

fDate

3/1/1999 12:00:00 AM

Firstpage

983

Lastpage

987

Abstract

A new piezoelectric piggy-back microactuator for high density hard disk drives was designed and fabricated to achieve more accurate positioning of the magnetic head and increasing servo bandwidth. The microactuator is made of stiff piezoelectric ceramic material to actuate the slider on which the head-element is formed. It is designed to amplify the actuating displacement. The basic mechanical performance of the microactuator was evaluated. The stroke of displacement was ±0.5 μm with a drive voltage of ±lO V and a dc bias of +10 V. The resonant frequency of the microactuator was high at 34 kHz. The fundamental resonant frequency of an assembled head with microactuator was high at around 20 kHz. The head variation was suppressed to O.1 μm by the microactuator with feedback control. These results suggest the feasibility of increasing servo bandwidth up to several kHz and positioning the head more precisely

Keywords

disc drives; feedback; hard discs; magnetic heads; microactuators; piezoelectric actuators; position control; servomechanisms; -10 V; 10 V; 34 kHz; actuating displacement; drive voltage; feedback control; hard disk drive; head variation; magnetic head; piezoelectric actuator; piezoelectric ceramic material; piggy-back microactuator; positioning; resonant frequency; servo bandwidth; slider; Bandwidth; Ceramics; Drives; Hard disks; Magnetic heads; Magnetic materials; Microactuators; Piezoelectric materials; Resonant frequency; Servomechanisms;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.753820

Filename

753820