Patent ID: 9502071
Filing Date: 2016-11-22
CPC Classification: G11B,H02K

Claim Text:
1. A spindle motor, comprising: a stationary portion; and a rotary portion rotatably supported so as to rotate about a center axis extending up and down; wherein the stationary portion includes a metal base member, an armature positioned above the base member, and a circuit substrate positioned on a lower surface of the base member and electrically connected to coils of the armature; the rotary portion includes a magnet configured to generate torque between the magnet and the armature; the base member includes a base through-hole configured to interconnect an upper opening defined at an upper surface side of the base member and a lower opening defined at a lower surface side of the base member; an insulating sheet portion, which is different and separate from the circuit substrate or a portion of the circuit substrate, is disposed at the lower surface side of the base member; the insulating sheet portion covers at least a portion of the lower opening of the base through-hole; lead wires extending from the coils extend to the lower surface side of the base member through the base through-hole, the lead wires extending radially outward along a lower surface of the insulating sheet portion while contacting the insulating sheet portion, and the lead wires are soldered to land portions of the circuit substrate; the stationary portion further includes a sealing material covering the lower opening of the base through-hole; the circuit substrate includes a first region defined by a plurality of layers axially laminated one above another; and the insulating sheet portion includes a smaller number of layers than the first region.