Spindle motor and information recording and/or reproducing...

Details Spindle motor and information recording and/or reproducing... Spindle motor and information recording and/or reproducing...

2005-07-26

2005-07-26

Castro, Angel (Department: 2653)

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

C310S06700R, C310S090000

Reexamination Certificate

active

06922309

ABSTRACT:
A spindle motor that can be reduced in size and thickness and yet develops a high rotational torque, and an information recording and/or reproducing apparatus employing this spindle motor. A rotor R includes a turntable50which carries and secures a disc-shaped recording medium D and which is rotatable relative to a fixed shaft66via a bearing, a ring-shaped first magnet60secured to the turntable50and arranged inwardly of a coil68having the fixed shaft66as center, and a ring-shaped second magnet62secured to the turntable50and arranged outwardly of the coil68having the fixed shaft66as center. The rotor R is rotated relative to the stator S, by a magnetic field generated in the coil68on supplying the current to the coil68and another magnetic field generated between the first and second magnets60and62.

REFERENCES:
patent: 4875110 (1989-10-01), Kazama et al.
patent: 4949000 (1990-08-01), Petersen
patent: 5500780 (1996-03-01), Boutaghou et al.
patent: 5670837 (1997-09-01), Boutaghou et al.
patent: 6674201 (2004-01-01), Liu et al.
patent: 6680814 (2004-01-01), Nii et al.

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