Patent ID: 8352975
Filing Date: 2013-01-08
Classification: G11B

Abstract:
1. A chucking device for removably holding a disk with a central opening, comprising: a shaft coaxially arranged with a specified central axis; a turntable fixed to the shaft, the turntable including a disk support surface arranged to support the disk; a cone arranged axially above the turntable, the cone including a sliding portion arranged to make axial sliding movement with respect to the shaft and a disk holding portion having an annular disk holding surface inclined radially outwards and axially downwards; an annular yoke arranged above the sliding portion of the cone and fixed to the shaft; and a clamp magnet fixed to the yoke through an adhesive agent; wherein the yoke includes an upper surface having an annular recess defined in a concentric relationship with the central axis, at least a part of the adhesive agent being applied on a region of the upper surface existing radially inwards of the recess; the recess includes a radial outer wall parallel to the central axis or inclined radially outwards and axially upwards, and a radial inner wall inclined radially inwards and axially upwards; and the angle between the radial outer wall and the central axis is smaller than the angle between the radial inner wall and the central axis.