Motor with a chucking device having a turntable and a plurality of balls, and a disk drive apparatus including the motor
AssigneeNidec Corporation
InventorsHaruhiko Ito, Takuya Yamane
Life of this patent
Estimating the term…
Abstract
A chucking device includes a disk support unit on which a disk is placed, a resin-made turntable arranged to directly or indirectly support the disk support unit from below, a metal member including a circular plate portion closely secured to a lower surface of the turntable, and a plurality of balls rollably arranged below the disk support unit and above the circular plate portion about a center axis in a circumferential direction. The turntable includes an antiskid member, a bottom rolling surface arranged to support the balls from below through the antiskid member and a cylindrical side rolling surface positioned radially outwards of the balls.
Claims23
A motor, comprising:
- a stationary unit comprising a stator;
- and
- a rotary unit comprising a rotor holder and a chucking device, wherein the rotor holder is made of a metal member, the rotor holder comprising:
- a circular plate portion having an upper surface;
- and
- a substantially cylindrical holder portion having a first outer surface extending downwards from a radial outer edge of the upper surface of the circular plate portion, the substantially cylindrical holder portion holding a magnet on an inner circumferential surface thereof, the stator radially opposed to the magnet,
- wherein the chucking device comprising:
- a turntable made of a resin having a substantially cylindrical outer peripheral wall extending downward, the substantially cylindrical outer peripheral wall having a second outer surface;
- and
- a plurality of balls arranged inside the substantially cylindrical outer peripheral wall to roll in a circumferential direction with respect to a center axis,
- wherein the turntable is secured to the circular plate portion, such that
- a lower end of the second outer surface is directly attached to the rotor holder, the lower end located below the upper surface.
Dependencies are inferred from the claim text.