Magnetic disk drive DD motor

Details Magnetic disk drive DD motor Magnetic disk drive DD motor

1997-06-27

2000-02-22

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

G11B 17022

Patent

active

060287381

ABSTRACT:
A magnetic disk drive DD motor 20 including: a printed board 22 that is mounted on an upper surface of a frame 21 of a magnetic disk drive and that has a coil formed on a surface thereof; a spindle shaft 23 that is inserted into a through hole 22a formed in the frame and the printed board and that is supported so as to be vertical and rotatable with respect to the frame; a rotor that is constructed of a rotor case 24a mounted on the spindle shaft so as to confront the coil on the printed board and of a ringlike rotor magnet 24b mounted inside the rotor case; and a disklike disk table 25 that is fixed to the spindle shaft on an upper side of the frame and that supports a magnetic disk. In such magnetic disk drive DD motor 20, the rotor case constituting the rotor is mounted onto the spindle shaft by a bearing portion 25a on the upper side of the frame while formed integrally with the disk table, and the bearing portion is formed integrally with the rotor case, the disk table, and the spindle shaft by molding a resin in the middle of the disk table, the resin having a magnetic powder a mixed therein.

REFERENCES:
patent: 4680655 (1987-07-01), Sugawara
patent: 5245235 (1993-09-01), Nagai et al.
patent: 5450260 (1995-09-01), Sakaguchi et al.
patent: 5777415 (1998-07-01), Suzuki et al.
patent: 5798886 (1998-08-01), Komatsu et al.

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