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:
Feb. 22, 2000
Filed:
Jun. 27, 1997
Makoto Konno, Yamagata, JP;
Hisashi Shibata, Yamagata, JP;
Mitsumi Electric Co., Ltd., Tokyo, JP;
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.