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. 23, 1999
Filed:
Jun. 29, 1993
Applicant:
Inventors:
Kiyoji Kikuchi, Tokyo, JP;
Toshio Fujimoto, Tokyo, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
360 9808 ; 360 9912 ;
Abstract
A disk drive apparatus includes a spindle motor which has a rotatable hub. The hub has an annular flange. A magnetic disk is fitted on the hub and urged against the flange by a clamp with a predetermined fixing force. A buffer member is interposed between the magnetic disk and the engagement portion. The buffer member has a thermal expansion coefficient which is substantially a intermediate value between thermal expansion coefficients of the magnetic disk medium and the engagement portion. A difference between the thermal expansion coefficients of the magnetic disk and the engagement member is larger than 10.times.10.sup.-6 �1/.degree. C!.