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. 07, 1997
Filed:
Jan. 24, 1996
Hitachi Maxell, Ltd., Osaka-fu, JP;
Abstract
A magnetic recording medium comprising a non-magnetic support, an intermediate layer which is formed on the non-magnetic support containing carbon black and non-magnetic particles other than carbon black, a particle size ratio between the carbon black and non-magnetic particles being from 1.0 to 4.0 in terms of a ratio of a diameter or a short axis size of the non-magnetic particles to a particle size of carbon black, and a magnetic layer which is formed on the intermediate layer and has a thickness of 0.2 to 1.0 .mu.m, in which magnetic layer a difference of an intensity at 102 mm.sup.-1 and that at 205 mm.sup.-1, in a frequency analysis of non-contact surface roughness is from 9 dB to 15 dB, in which a total thickness of the non-magnetic support, the intermediate layer and the magnetic layer is not greater than 13 .mu.m, which recording medium is excellent in electromagnetic conversion characteristics and durability.