Patent ID: 7564155

Claim:
A bearing unit comprising: a dynamic pressure fluid bearing having a tapered upper end, the dynamic pressure fluid bearing configured to receive a rotary shaft inserted into said dynamic pressure fluid bearing; a unit main body surrounding the outside of the fluid bearing; a lid member covering an upper opening of the unit main body with the rotary shaft inserted into the dynamic fluid bearing; lubricating oil within the unit main body; and an oil thrower ring extending perpendicular to the rotary shaft and rotatable together with the rotary shaft in a space defined between an upper end of the fluid bearing and the lid member; wherein, a gap defined between the lid member and the oil thrower ring is tapered in cross-section so as to progressively reduce in the distance therebetween as the gap is spaced apart from the center of the rotary shaft, and a gap defined between the upper end of the fluid bearing and the oil thrower ring is tapered in cross-section so as to progressively increase in the distance therebetween as the gap is spaced apart from the center of the rotary shaft.