Patent ID: 8665557
Filing Date: 2014-03-04
Classification: G11B

Abstract:
1. A spindle motor, comprising: a stationary unit; and a rotary unit supported to rotate about a center axis extending in an up-and-down direction; 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 a coil of the armature; the rotary unit includes a magnet arranged in an opposing relationship with the armature; the base member includes an annular bottom portion positioned below the armature, a base groove portion arranged on the bottom portion, at least one base through-hole positioned within the base groove portion to axially extend through the bottom portion, and a first insulating sheet portion arranged on a bottom surface of the base groove portion; a lead wire extending from the coil is led out into the base groove portion through the base through-hole, the lead wire extends radially outward along a lower surface of the first insulating sheet portion, and the lead wire is fixed to a land portion of the circuit substrate at a radial outer side of the bottom portion; and the base through-hole includes a major axis extending in a radial direction and a minor axis extending in a circumferential direction, the base through-hole has a radial length larger than a circumferential width thereof, and the base through-hole includes a portion of an edge of the first insulating sheet portion arranged on the lower surface of the base member to intersect the major axis of the base through-hole and to cover a portion of the base through-hole.