高信頼性を目的としたフェムトスライダのロード・アンロード挙動の研究(機械要素,潤滑,工作,生産管理)

概要

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Small "femto slider" instead of pico slider has been applied to hard disk drives to reduce the cost. One of the most important evaluation items was the load/unload behavior, especially for the reliability with femto slider. We investigated the load/unload behavior of femto slider by laser doppler vibrometers and compared it with that of pico slider. The results showed that neither slider/dimple separation during unloading nor pitch vibration after unloading occurred, because of the small residual negative force. However, even femto slider showed vibration after unloading when Z-height was set smaller than nominal, which increased the residual negative force. In addition, "pitching-forward" of slider was observed during loading with extremely small Z-height, regardless of slider size. Small dots at the leading edge effectively prevented the pitching-forward, most likely due to lower friction at the leading edge of slider at loading.
2008-06-25