Hideki Kuwajima

Thin-film piezoelectric DSA for HDD

A new dual-stage actuator (DSA) for positioning a magnetic head for high-density hard disk drives was proposed and developed. This DSA device is characterized by applying sputter-deposited thin-film lead-zirconate-titanate material (PZT), instead of the previously proposed bulk type actuator. The device performance was found to be outstanding with peak-to-peak head displacement of 1.2 /spl mu/m at an applied voltage of /spl plusmn/5 V, and suspension resonance frequency higher than 15 kHz, yielding a servo bandwidth of more than several kHz.

Manufacturing process of piezoelectric thin-film dual-stage actuator and its reliability for HDD

A new dual-stage actuator for positioning a magnetic head for high-density hard disk drives was proposed and developed. This dual-stage actuator device is characterized by the sputter-deposited thin-film PZT, featuring large displacement of 1.2 /spl mu/m and high-resonance frequency over 15 kHz. In this paper, reliability against temperature, humidity, and mechanical shock was investigated to ensure the practical application to the drive products.

Piezoelectric thin film reliability for HDD dual-stage actuator

Summary form only given. A new dual-stage actuator for positioning a magnetic head for high-density hard disk drives (HDDs) was proposed and developed. This dual-stage actuator device is characterized by the sputter-deposited thin film PZT, featuring large displacement of 1.2 microns and high resonance frequency over 15 kHz. In this work, reliability against temperature, humidity, heat cycle, and mechanical shock was investigated to ensure the practical application to the drive products.