Patent ID: 8002471

Claim:
A fluid dynamic bearing apparatus comprising: a shaft member; a fixed-side member which freely rotatably supports the shaft member; a member which is attached to the shaft member and has a portion for mounting a rotor magnet; and a magnetic shielding member, wherein the shaft member is supported in a radial direction in a non-contact manner by a hydrodynamic effect of a fluid which is produced in an annular radial bearing gap between the fixed-side member and the shaft member, wherein the member having the portion for mounting the rotor magnet is formed of a resin, wherein the magnetic shielding member comprises a magnetic substance and has an approximate L-shape in cross section, the magnetic shielding member including an axial direction portion extending in an axial direction and a radial direction portion extending in the radial direction from an end portion of the axial direction portion, the axial direction portion and the radial direction portion being formed integrally with each other, the magnetic shielding member being disposed in the member having the portion for mounting the rotor magnet, and wherein the rotor magnet is fixed to an outer periphery of the axial direction portion of the magnetic shielding member so as to oppose the radial direction portion of the magnetic shielding member.