Abstract A disk drive unit has a turntable in which a central pin projecting from the center of a disk mounting surface, a drive pin projecting from an eccentric position spaced away from the position of the central pin, and a magnet for making the disk attract to the disk mounting surface are provided. The central pin and the drive pin are fitted in respective insertion holes provided in the core of the disk, while the core is fixed to the disk mounting surface due to attractive force of the magnet, so that the disk may be rotated by the turntable. Further, an arc-like projection having a predetermined height a little smaller than that of the disk mounting surface is so provided on the turntable as to extend outside the disk mounting surface and that along the outer edge of the turntable. The arc-like projection and the drive pin are disposed on opposite sides of the central pin. Thus, the core of the disk is prevented from being mounted on the disk mounting surface in a slanted state when information is to be recorded on reproduced from the disk.
In a disk drive unit for rotating an information-transferring disk having at least a partial magnetically-attractable core to record or reproduce information, an improvement in which the unit comprises: a turntable having a disk mounting surface; a central pin projecting from the center of said disk mounting surface, a drive pin projecting from said turntable at an eccentric position spaced away from the position of the central pin, and a magnet for making the disk attract to the disk mounting surface; wherein the central pin and the drive pin are fitted in respective insertion holes provided in the core of the disk, while the core is fixed to the disk mounting surface due to an attractive force provided by the magnet to the core, so that the disk may be rotated by the turntable; and a projection having a predetermined height slightly smaller than that of the disk mounting surface is so provided on the turntable as to extend outside the disk mounting surface and along an outer edge of the turntable, the projection and the drive pin being disposed on opposite sides of the central pin.
Claim 2
Dependent Claim
187 words
In a disk drive unit for rotating an information-transferring disk having at least a partial magnetically-attractable core to record or reproduce information, an improvement in which the unit comprises: a turntable having a disk mounting surface; a central pin projecting from the center of said disk mounting surface, a drive pin projecting from said turntable at an eccentric position spaced away from the position of the central pin, and a magnet for making the disk attract to the disk mounting surface; wherein the central pin and the drive pin are fitted in respective insertion holes provided in the core of the disk, while the core is fixed to the disk mounting surface due to an attractive force provided by the magnet to the core, so that the disk may be rotated by the turntable; and a projection having a predetermined height slightly smaller than that of the disk mounting surface is so provided on the turntable as to extend outside the disk mounting surface and along an outer edge of the turntable, the projection and the drive pin being disposed on opposite sides of the central pin.
Claim 3
Dependent Claim
50 words
A disk drive unit according to claim 1, in which the drive pin insertion hole has a front side provided in coincidence with a direction of normal revolution of the drive pin, and an outer side substantially perpendicular to the front side and near an outer edge of the core.
Claim 4
Dependent Claim
31 words
A disk drive unit according to claim 2, in which the drive pin is urged in a direction of the outer side of the drive pin insertion hole by urging means.
Claim 5
Dependent Claim
39 words
A disk drive unit according to claim 3, in which the drive pin is of cylindrical shape, the upper surface of which is substantially flat, and the boundary between the upper surface and the cylindrical side surface is chamfered.