Patent ID: 7399120

Claim:
A spindle motor furnished with a dynamic pressure bearing comprising: a base; a sleeve in cylindrical shape being fixed on the base; a shaft section inserted into a through hole of the sleeve, being rotatable with respect to the base; a hub rotating together with the shaft section; a radial dynamic pressure bearing section formed between the shaft section and the sleeve; a flange section protruding in a radial direction on an outer circumferential section of the sleeve; a wall section in annular shape provided on the hub protruding with surrounding the sleeve; a thrust ring fixed on an inner circumferential section of the wall section being adjacent to the flange section and the shaft section in an axial direction; and a seal plate fixed on an outer circumferential section of the sleeve with sandwiching the thrust ring between the flange section of the sleeve and the seal plate in an axial direction, wherein the spindle motor is furnished with a first thrust dynamic pressure bearing section, which is formed between confronting surfaces of the thrust ring and the flange section, and a second thrust dynamic pressure bearing section, which is formed between confronting surfaces of the thrust ring and the seal plate.