CERAMIC DYNAMIC PRESSURE BEARING, MOTOR WITH BEARING, HARD DISC DEVICE, POLYGON SCANNER AND MANUFACTURING METHOD OF CERAMIC DYNAMIC PRESSURE BEARING

摘要

PROBLEM TO BE SOLVED: To provide a ceramic dynamic pressure bearing having a dynamic pressure groove capable of smoothly generating dynamic pressure with superior productivity.;SOLUTION: A portion including a surface (a dynamic pressure gap forming face) facing a dynamic pressure gap is composed of at least ceramic. The dynamic pressure groove GV having a curvature part R with 3-7 mm radius is formed by electrolytic etching on the dynamic pressure gap forming face comprising the ceramic at a connecting position between a groove inner side face SG and a groove bottom face BG in a cross section perpendicular to a longitudinal direction of the groove.;COPYRIGHT: (C)2002,JPO