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. 20, 2004
Filed:
Feb. 26, 2002
Akemi Hirotsune, Saitama, JP;
Makoto Miyamoto, Ome, JP;
Toshimichi Shintani, Kodaira, JP;
Keikichi Andoo, Musashino, JP;
Yumiko Anzai, Ome, JP;
Takahiro Kurokawa, Kokubunji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
To provide an information recording medium which permits high density recording/reproduction, which has good thermal stability, and which, due to the use of an interface layer with a high sputter rate, has good recording/reproduction characteristics and is excellent for mass production. An information recording medium wherein the thickness of an interface layer is 0.25 or more but 0.67 or less of the total thickness of a first protective layer and the interface layer , and the interface layer contains at least tantalum (Ta) and oxygen (O). The medium is excellent for mass production and has good recording/reproduction characteristics for high density recording/reproduction.