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. 17, 1995
Filed:
Apr. 28, 1994
Applicant:
Inventors:
Assignee:
Hitachi Maxell, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
360133 ; 360135 ;
Abstract
A magnetic disk comprises a flexible disk-shaped magnetic sheet with a magnetic layer formed on a substrate film and having an aperture in the center of the disk; a center hub made of metal sheet and having a flange on its outer peripheral part, fabricated by inserting the center hub into the aperture of the magnetic disk-sheet, whereby the flange and an inner peripheral part of the magnetic sheet are bonded together, and wherein a circular recess with a cross-sectional shape, such as step or tapered-shape is provided in the outer peripheral part of the center-hub flange.