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:
Nov. 23, 1993
Filed:
Dec. 06, 1991
Applicant:
Inventors:
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369290 ; 369270 ; 369271 ;
Abstract
An information memory medium (10) includes disk-shaped substrates (30a, 30b) and recording layers (32a, 32b). It also has a centering member (38a, 38b) whose coefficient of thermal expansion resembles that of the substrates (30a, 30b). Two flat magnetic members (40a, 40b) are situated in annular depressions (68a, 68b) provided in the centering member. The annular depressions are larger than the magnetic members so that differences in thermal expansion can be absorbed.