The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 22, 1994
Filed:
Jul. 28, 1992
Tokumon Ogawa, Komagane, JP;
Nagano Nidec Corporation, Nagano, JP;
Abstract
A disk drive apparatus includes a magnetic disk, a spindle motor for rotating the magnetic disk, a magnetic head for writing data on and/or reading out data from the magnetic disk, a support arm for supporting the magnetic head, and a voice coil motor for pivoting the support arm. The spindle motor has a hub on which the magnetic disk is mounted, a rotor magnet mounted on the hub, and a stator disposed opposite to the rotor magnet. The stator includes a stator core around which an armature coil is wound. Teeth portions of the stator core are disposed substantially equiangularly in a circumferential direction while at least part of a plurality of coil winding portions are disposed non-uniformly in the circumferential direction, whereby the armature coils wound around the plurality of coil winding portions are retracted from a path in which the support arm is moved.