Patent ID: 8643978

Claim:
A spindle motor, comprising: a stationary unit; and a rotary unit supported to rotate about a center axis extending up-and-down; wherein the stationary unit includes a base member, an armature positioned above the base member, and a circuit substrate arranged on a lower surface of the base member and electrically connected to coils of the armature; the rotary unit includes a magnet arranged to generate torque between the magnet and the armature; the base member includes an annular or substantially annular bottom portion positioned below the armature, base through-holes axially extending through the bottom portion, and a lower slant surface extending radially outward and upward from an outer peripheral portion of a lower surface of the bottom portion; the circuit substrate includes a plurality of land portions arranged on a lower surface of the circuit substrate; a plurality of lead wires extending from the coils is led out toward the lower surface of the circuit substrate through the base through-holes and is fixed to the land portions; the lower slant surface includes a first slant surface and a second slant surface arranged along a circumferential direction; at least one of the land portions is arranged on each of the first slant surface and the second slant surface, and a first straight line extending along an inclination direction of the first slant surface and a second straight line extending along an inclination direction of the second slant surface extend away from each other in the circumferential direction as the first straight line and the second straight line extend radially outward.