Disk drive device which includes a clamping magnet for attracting a disk
AssigneeMinebea Motor Manufacturing Corporation
InventorsKinjirou Okinaga, Masahito Hidaka, Koji Kuyama
Life of this patent
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Abstract
The present invention provides a disk drive device that can appropriately clamp a disk by means of magnetic force even when the disk drive device is very small. A clamping magnet 16 on which a disk 20 is mounted is attached to a turntable portion 15b of a rotor frame 15 to attract the disk 20. The clamping magnet 16 is configured so that the disk 20 can be mounted on the clamping magnet 16. An area of the rotor frame 15 from the turntable portion 15b to a boss portion 15a is composed of a ferromagnetic material.
Claims6
A disk drive device comprising a rotor frame to which a shaft is rotatably fixed, the rotor frame having a boss portion to which the shaft is rotatably fixed and which is insertable through a disk hole, a turntable portion extending radially outward from the boss portion, and a cylindrical portion extending from an outer periphery of and co-axial with the shaft and the turntable portion, the disk drive device further comprising a driving magnet attached to an inner surface of the cylindrical portion, and a clamping magnet attached to the turntable portion for attracting a disk and on which a disk is mountable, an area of the rotor frame from the turntable portion to the boss portion comprising a ferromagnetic material.
Dependencies are inferred from the claim text.