Patent ID: 7737095

Claim:
A hydrodynamic bearing device, comprising at least one of a rotating component and a fixed component having a dynamic pressure-generating mechanism, and a lubricant present in a gap between the rotating component and the fixed component; wherein the lubricant contains at least one compound selected from the group consisting of aliphatic ethers represented by Formula (2) and Formula (4); R 3 —O—A—O—R 4 (2) R 7 —O—X—O—Y—O—Z—O—R 8 (4), wherein: R 3 and R 4 represent a C 8 to C 12 alkyl group, A is 3,3-diethylpentylene or 2,4-diethylpentylene, R 7 and R 8 each represents a C 9 to C 11 alkyl group, and X, Y and Z are each 2-methylethylene, and the aliphatic ether of Formula (2) has a total carbon number of 25 to 32.