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:
Jan. 01, 2013
Filed:
Aug. 31, 2010
Applicants:
Toshiki Maeda, Shizuoka, JP;
Kazuhide Kamata, Shizuoka, JP;
Morifumi Ohsawa, Shizuoka, JP;
Inventors:
Assignee:
Alphana Technology Co., Ltd., Shizuoka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 17/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A disk drive device has a hub so configured as to place and hold recording disks. Where the non-rotating eigenfrequency of resonance in a secondary rocking mode with the recording disks placed on the hub is defined to be F0 (Hz) and the rotational frequency of the hub is defined to be N (Hz), an extending part of the hub and a second cylinder part of the hub are formed such that the radial dimension of the extending part is smaller than the axial dimension of the second external cylinder part to satisfy to a relation F0>N·(3·P+2).