Patent ID: 8468554
Filing Date: 2013-06-18
Classification: H02K

Abstract:
1. A spindle motor for removably holding a disk having a central opening, comprising: a shaft arranged in a coaxial relationship with a center axis extending in an up-down direction; a cone capable of making sliding movement in the up-down direction with respect to an upper portion of the shaft; a turntable directly or indirectly fixed to the shaft at a lower side of the cone; a cylindrical closed-top rotor holder directly or indirectly fixed to the shaft at a lower side of the turntable; a rotor magnet fixed to an inner circumferential surface of a cylinder portion of the rotor holder; a stator arranged inwardly of the rotor magnet; and a bearing mechanism arranged to rotatably support the shaft so that the shaft can rotate about the center axis, wherein the cone includes a disk holding surface inclined radially outward and downward, and the turntable further includes: a resin-made table body having a disk support portion arranged around the cone and an annular groove portion depressed upward at a lower side of the disk support portion; a plurality of balls rotatably arranged within the annular groove portion; an annular closure portion arranged between the table body and the rotor holder to close an opening of the annular groove portion; and a disc-shaped portion arranged radially inward of the annular groove portion of the table body, the disc-shaped portion having an upper surface bonded to the table body by a first adhesive agent and a lower surface bonded to the rotor holder by a second adhesive agent.