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. 27, 2007
Filed:
Jun. 17, 2004
Shigeo Kurose, Tokyo, JP;
Hiroyuki Tanaka, Tokyo, JP;
Kenji Shirasuna, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A magnetic recording medium is provided, in which a high recording density is realized, and an electromagnetic transducing characteristic and an error rate are improved. The magnetic recording medium includes a non-magnetic layer containing a non-magnetic powder and a binder resin and a magnetic layer containing a ferromagnetic powder and a binder resin on one surface of a non-magnetic substrate, the non-magnetic powder contains a non-magnetic inorganic powder having an average particle diameter of 80 nm or less, the three-dimensional center surface average roughness of the magnetic layer surface is 3.0 nm or less in a region of 100 μmbased on a measurement with an atomic force microscope, and the area share held by asperities of at least ±5.0 nm with reference to the surface at an average height is 15 percent or less in a region of 100 μmon the magnetic layer surface.