Patent ID: 6998745

Claim:
An apparatus for a spindle motor, comprising: a rotary shaft having two ends and a flange near distanced from the two ends in an axial direction; a bearing unit, which supports the rotary shaft in a freely rotatable manner, further comprising: a bearing sleeve, into which the rotary shaft can be inserted; a counter plate, affixed at one end of the bearing sleeve; a first step section, in a mid-section of the bearing sleeve, formed to receive the flange; a second step section, in a bottom face of the bearing sleeve, formed to receive the counter plate an inner-side sleeve having a first shaft hole; and an outer-side sleeve having a concave and a second shaft hole; wherein the inner-side sleeve fits into the concave of the outer-side sleeve; a rotary hub member which is fixed to the rotary shaft; and, a motor rotating the rotary hub member by an electromagnetic action, wherein a radial dynamic pressure generating area is present between the bearing unit and an outer peripheral surface on the rotary shaft on each side of the flange, and wherein at least one thrust dynamic pressure generating area is present between the bearing unit and the flange.