DYNAMIC PRESSURE GAS BEARING CONSTRUCTION

摘要

PURPOSE: To provide a dynamic pressure gas bearing construction which can be applied to a rotational driving part of high speed such as a hard disc driver, and has high rotational accuracy at high rotating speed. CONSTITUTION: This dynamic pressure gas bearing construction is provided with a shaft body 1 and a bearing body 2. When the shaft body 1 and the bearing body 2 are arranged so that the center axes 50 are conformed to each other, a nearly cylindrical void 3 is formed by the outer circumferential face of the shaft body 1 and the inner circumferential face of the bearing body 2. The void 3 is provided with at least one void changing part changing the thickness against the central angle corresponding to the circumference along the outer circumferential face of the shaft body 1. The rate of change of the void α is more than 1.0×10<-4> / deg., and less than 10.0×10<-4> / deg..