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:
Aug. 10, 2010
Filed:
Apr. 28, 2005
Applicants:
Motoyoshi Murakami, Osaka, JP;
Masahiro Birukawa, Osaka, JP;
Inventors:
Motoyoshi Murakami, Osaka, JP;
Masahiro Birukawa, Osaka, JP;
Assignee:
Panasonic Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/82 (2006.01);
U.S. Cl.
CPC ...
Abstract
With a magnetic recording medium, servo pits have to be recorded one disk at a time, which is a problem in that it takes more time and is more expensive. In view of this, with the present invention, at least one signal region whose surface roughness is different from that of other than the signal region is formed on the substrate of a magnetic recording medium comprising a recording layer on a substrate, or on an under layer formed on a substrate.