Patent ID: 8562219
Filing Date: 2013-10-22
Classification: F16C,H02K

Abstract:
1. A fluid dynamic bearing device comprising: a bearing member; a rotating body including a shaft member to be inserted to an inner circumference of the bearing member; and a radial bearing part for supporting the rotating body including the shaft member in a radial direction with a fluid film generated in a radial bearing gap formed between the bearing member and the shaft member, wherein: a gap width out of the radial bearing gap is axially differed; a narrow width part which has a relatively smaller gap width in the radial bearing gap is arranged on a side relatively closer to a barycentric position of the rotating body, and a wide width part which has a relatively larger gap width in the radial bearing gap is arranged on a side relatively distant from the barycentric position of the rotating body; and a region facing at least the radial bearing gap of the bearing member is formed to an electroformed part made of deposited metal.