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:
Apr. 29, 2003
Filed:
Sep. 23, 2002
Rikuro Obara, Miyota-machi, JP;
Minebea Kabushiki-Kaisha, Nagano-ken, JP;
Abstract
The object of the present invention is to provide a hard disk drive device having a bearing device of larger size and sufficient strength, improved impact resistance, high accuracy of rotation, and high reliability. In accordance with the present invention, a hard disk drive device comprises a motor including: a rotor or hub having around an outer periphery thereof a downwardly depending flange, wherein the hub is journalled rotatably on a base by way of a bearing; the hub provided with a magnet on the inner peripheral surface of the downwardly depending flange; a stator provided on the base so as to be opposed face to face with the magnet, the stator including coils; and a magnetic disk or disks having a central aperture to be fitted around the outer peripheral surface of flange provided around the hub of the motor, the magnetic disk adapted to be rotated by the motor; wherein the inner diameter of the downwardly depending flange of the hub of the motor is enlarged, so that the outer and inner diameters of the magnet confined within the downwardly depending flange, and the outer and inner diameters of the stator are also enlarged to allow the outer diameter of the bearing device to be enlarged.