流体軸受装置と、それを用いたスピンドルモータおよび情報装置

Fluid bearing device, and spindle motor and information device using the same

Abstract

<P>PROBLEM TO BE SOLVED: To provide a both-end supported fluid bearing device wherein the level of the liquid surface of lubricating fluid at its seal portion is precisely controlled in a bearing for a spindle motor to be used in an information device such as a hard disc drive. <P>SOLUTION: In such a positional relationship that a first liquid surface 16a and a second liquid surface 16b have the same atmospheric position as that of the lubricating fluid 16 in a gravity direction, one liquid surface position is used as a criterion for the other liquid surface position to be measured, whereby a liquid surface difference is directly measured. Thus, the liquid surface of the lubricating fluid 16 can be precisely controlled even in the both-end supported fluid bearing device 1 where the mutual liquid surfaces influence each other. <P>COPYRIGHT: (C)2009,JPO&INPIT
【課題】本発明は、ハードディスクドライブ等の情報装置に使用されるスピンドルモータ用の軸受の中で、両端支持の構成を持つ流体軸受装置に関し、潤滑流体のシール部における液面高さを精度良くコントロールできる流体軸受装置を提供する。 【解決手段】第1の液面16aと第2の液面16bが重力方向に対して潤滑流体16と大気の位置が同じ位置関係になる構成で、一方の液面位置を基準に他方の液面位置を測定することで液面の差を直接測定する。これにより、相互の液面が影響しあう両端支持の流体軸受装置1においても精度良く潤滑流体16の液面のコントロールを行うことが出来る。 【選択図】図2

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