| 摘要 |
PROBLEM TO BE SOLVED: To prevent seizure by reduction in lubricating fluid by preventing or reducing the leakage of the lubricating fluid to a bearing outside in the fluid dynamic pressure bearing. SOLUTION: This fluid dynamic pressure bearing having a shaft member and a radial fluid dynamic pressure bearing means interposed toward a sleeve member ralatively ratatable to the shaft member is provided with a migration prevention means preventing the migration of the lubricating fluid promoted by a centrifugal force in the end released to the atmosphere of the radial fluid dynamic pressure bearing means.
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