Inline-actuated suspension for the fine head positioning of HDD

Gih Keong Lau*, Hejun Du

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


A new design of inline-actuated suspension is developed for application in the dual-stage head positioning of hard disk drives (HDD). This design exploits a parallel mechanism to convert longitudinal piezoelectric actuation into a lateral stroke. It is embodied in an elongated portion of a slender load beam. Besides serving the intended function of adequate stroke, the new design significantly improves shock resistance and dynamics. Its sway frequency improves by 19%, as compared to a push-pull design. In addition, the piezoelectric plate for inline actuation is subjected to 66% less shock-induced stress than the pair for push-pull actuation. The new actuator only requires standard manufacturing and assembly processes for realization and no costly miniaturization.

Original languageEnglish
Article number040
Pages (from-to)1416-1423
Number of pages8
JournalJournal of Micromechanics and Microengineering
Issue number7
StatePublished - 1 Jul 2006

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