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:
Jun. 01, 1993
Filed:
Sep. 11, 1990
Applicant:
Inventors:
Noboru Koyama, Hino, JP;
Kazuyoshi Imai, Hachioji, JP;
Assignee:
Konica Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ; B32B / ; G11B / ;
U.S. Cl.
CPC ...
428141 ; 428333 ; 4286 / ; 428900 ;
Abstract
There is disclosed a magnetic recording medium having improved output levels of electromagnetic conversion properties and reduced rubbing noise. The recording medium copmprises an uppermost magnetic layer and a lower magnetic layer, wherein a thickness of the uppermost layer is 0.1 to 1.0 .mu.m; a coercive force of the total magnetic layers is 690 to 770 Oe; and a surface waviness of the uppermost layer is 0.015 .mu.m or less.