Patent ID: 7654744

Claim:
A fluid dynamic bearing mechanism for a motor, wherein a lubricant is continuously supplied into a minute gap formed between rotating parts and stationary parts, said minute gap including dynamic pressure grooves, and wherein a capillary seal part is formed at one end of the minute gap for preventing leakage of said lubricant, said fluid dynamic bearing mechanism comprising: a bearing member; a shaft member rotatably mounted in said bearing member; an annular member on the shaft member side mounted on said shaft member at a location corresponding to said capillary seal part; an annular member on the bearing member side mounted on said bearing member at a location corresponding to said capillary seal part; a taper or step formed on the outer periphery surface of said annular member on the shaft member side; and a taper or step being formed on the inner periphery surface of said annular member on the bearing member side; wherein the outer periphery surface of said annular member on the shaft member side and the inner periphery surface of said annular member on the bearing member side are arranged close to each other in the axial and radial directions to form said capillary seal part, and to preventing said rotating parts and said stationary parts from disengaging from each other.