Patent ID: 7201516

Claim:
A fluid bearing device, comprising: a sleeve; a shaft inserted into the sleeve via a predetermined clearance; a radial bearing portion for allowing the sleeve to rotatably support the shaft; a lubricant filled in the clearance between the shaft and the sleeve including the radial bearing portion; and a seal surface portion formed in the sleeve in a location facing an open end thereof, and having a larger clearance around the shaft than at the radial bearing portion, the clearance around the shaft being filled with the lubricant, wherein the seal surface portion has a sectional shape defined by a plurality of inclined surfaces including an inclined surface adjacent to the radial bearing portion and at least one inclined surface distant from the radial bearing portion, and the adjacent inclined surface forms an inclination angle with respect to the shaft axis, and the distant inclined surface forms an inclination angle with respect to the shaft axis, the former angle being larger than the latter angle, and an oil repellent for repelling the lubricant coated on an annular groove portion in the shaft exposed to the outside, said groove portion located above the seal surface portion.