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:
Apr. 01, 2008
Filed:
Feb. 22, 2005
Mikiharu Hibi, Tokyo, JP;
Kazuhiro Hattori, Tokyo, JP;
Kazuya Shimakawa, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A magnetic recording medium including at least a disk substrateA, a magnetic recording layerformed with a predetermined concavo-convex pattern on the disk substrateA, and a non-magnetic layerfilled into concave portions of the concavo-convex pattern, so as to have data track regionsand servo pattern regions. Due to the existence of concaves and convexes in the surface of each servo pattern region, the foregoing problem is solved. On this occasion, arithmetical mean deviation of the assessed profile Ra of the surface of each servo pattern regionis preferably not lower than 0.3 nm. The difference in surface level between each concave and each convex existing in the surface of the servo pattern regionis preferably not larger than 6 nm.