Patent ID: 7798721

Claim:
A fluid dynamic bearing device, comprising: a rotating member; a stationary member arranged relative to the rotating member so as to form a radial bearing gap and a thrust bearing gap therebetween; a radial bearing portion configured to retain the rotating member and the stationary member in a radial direction in non-contact fashion by dynamic pressure action of a fluid generated in the radial bearing gap between the rotating member and the stationary member; and a thrust bearing portion configured to retain the rotating member and the stationary member in a thrust direction in non-contact fashion by dynamic pressure action of the fluid generated in the thrust bearing gap between the rotating member and the stationary member, wherein at least a portion of the stationary member and at least a portion of the rotating member face the thrust bearing gap and are formed of resin, and wherein at least one of the at least a portion of the stationary member formed of resin and the at least a portion of the rotating member is formed of resin is blended with reinforcement fibers of a fiber diameter of 1 to 12 μm as a filler.