Patent ID: 8587896

Claim:
A motor for use in a disk drive apparatus for rotating a disk about a center axis extending in an up and down direction, the motor comprising: a base member extending radially outward from the center axis; and a stator supported on the base member and provided with a plurality of coils; wherein the base member includes a radially-extending flat base body portion including a through-hole or a depressed portion and a motor base portion arranged in the through-hole or the depressed portion of the base body portion, the motor base portion including a disc-shaped or substantially disc-shaped bottom portion extending radially outward; the motor base portion is made of a first kind of metal, the base body portion made of a second kind of metal, the first kind of metal being larger in Young's modulus than the second kind of metal; the motor base portion includes a base through-hole arranged to bring an upper surface and a lower surface of the motor base portion into communication with each other and a base groove portion positioned on the lower surface of the motor base portion and depressed toward the upper surface of the motor base portion, the base groove portion extending radially outward from the base through-hole and reaching a radial outer edge of the lower surface of the motor base portion; at least one lead wire is led out from the coils, the at least one lead wire extending from the upper surface of the motor base portion to the lower surface of the motor base portion via the base through-hole and then extending radially outward through the base groove portion; at least a portion of a lower surface of the base body portion is covered with an insulating film; an outer circumferential surface of the motor base portion and an inner circumferential surface of the base body portion, which are opposed to each other, include an exposed region which is not covered with the insulating film; and an insulating layer is arranged between the at least one lead wire and a bottom surface of the base groove portion to cover a border between the motor base portion and the base body portion, an outer edge of the base groove portion and an inner edge of the base body portion opposed to the outer edge of the base groove portion.