STUDY ON INTEGRATED PIEZOELECTRIC DUAL STAGE ACTUATOR / SUSPENSION SYSTEM FOR HIGH PERFORMANCE HARD DISK DRIVES

概要

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The track density of hard disk drives has been increasing about 30% annually and is expected to reach 25kTPI by the year 2000. A very promising way to achieve such high track density is to use a dual-stage actuator system. A new piezoelectricity driven dual stage actuator design consisting of two shear-mode PZT elements located at the base of the suspension is proposed in this paper. The dual stage actuator utilizes the opposite shear deformations of the two PZT elements under applied electrical potential to rotate the suspension and cause lateral slider motion. Finite element method is used to model and study the new dual stage actuator design on a typical suspension structure. The tip stroke response and dynamic characteristics of the dual stage actuator/suspension assembly are investigated, Simulation result shows the new shear-mode piezoelectric actuator to be a promising dual stage actuator system. Optimizing of the driving capacity can be achieved by a stacked piezoelectric design.
社団法人電子情報通信学会の論文
1999-02-25