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:
May. 09, 2006
Filed:
Aug. 16, 2002
Makoto Miyamoto, Ome, JP;
Akemi Hirotsune, Saitama, JP;
Toshimichi Shintani, Kodaira, JP;
Takahiro Kurokawa, Kokubunji, JP;
Keikichi Andoo, Musashino, JP;
Yumiko Anzai, Ome, JP;
Makoto Miyamoto, Ome, JP;
Akemi Hirotsune, Saitama, JP;
Toshimichi Shintani, Kodaira, JP;
Takahiro Kurokawa, Kokubunji, JP;
Keikichi Andoo, Musashino, JP;
Yumiko Anzai, Ome, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Problem to be solved is that when an information recording medium is repeatedly subjected to recording of information several hundreds times, the atoms in a protective layer are diffused and dissolved into a recording layer to lower a reflectivity greatly and make the medium unendurable to many times of overwriting. This problem can be solved by a medium constituted of interference layer, interface layer, phase-change type recording layer, protective layerhaving a tin content of from 23.3 atomic % to 32.3 atomic %, and a heat sink layersuccessively formed on substrate, as seen from a light-incidence side. By use of this medium, the dissolution of atoms can be prevented, and overwriting for many times can be achieved.