ダンパーによるHDD用サスペンションのフレキシャー振動低減

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  • Reduction of Flexure Vibration for HDD Suspension by Damper

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<p>The Amount of digital data being generated is increasing dramatically. The data generation in a year worldwide is expected to reach about 175 zettabytes in 2025, and the demand for data recording devices is expected to continue to increase. In order to increase the recording capacity of a hard disk drive (HDD), it is important to increase the data track density, and for that purpose, highly accurate head positioning performance is required for the HDD. In recent HDDs, PZTs are mounted on a suspension that supports the head to accurately control the position of the head. Especially in high capacity HDDs, the PZTs are located on the flexure near the head for more accurate positioning. However, in this structure, the actuation of PZT can cause the flexure to vibrate which could lead to a deterioration in the positioning performance. In this paper, in order to reduce the vibration of flexure in the HDD suspension, we conducted an experiment to attach a damper to the flexure. The damper was able to remarkably reduce the vibration of slider under 20kHz without a significant increase in the stiffness of the flexure. Moreover, in a shock test, the damper suppressed the deformation of the flexure, and reduced deterioration of the vibration characteristics.</p>

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