FLUID BEARING UNIT

摘要

PROBLEM TO BE SOLVED: To provide a fluid bearing unit capable of achieving stable rotation by reducing the seizure of a bearing and the leakage of lubricant. SOLUTION: A lubricant 10 is filled between a shaft 2 and a bearing body which is rotatably supported by the shaft 2. A membrane 12a is formed on the inside of a hub 5 contacting with the lubricant 10 in order to suppress the wear of the bearing body. The difference between the surface tension of a fluorine lubricant and the critical surface tension of the membrane 12a is made to be less than 5 mN/m by using the fluorine lubricant as the lubricant 10.