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. 03, 2004
Filed:
May. 20, 2002
Makoto Harigaya, Kanagawa, JP;
Hiroshi Miura, Kanagawa, JP;
Hiroko Okura, Kanagawa, JP;
Miku Mizutani, Kanagawa, JP;
Eiko Hibino, Kanagawa, JP;
Hajime Yuzurihara, Kanagawa, JP;
Yoshiyuki Kageyama, Kanagawa, JP;
Mikiko Abe, Kanagawa, JP;
Hiroshi Deguchi, Kanagawa, JP;
Kazunori Ito, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An optical recording medium comprising a recording layer which comprises a phase-change recording material causing a reversible phase change between a crystalline phase and an amorphous phase by irradiation with an electromagnetic wave, wherein the phase-change recording material mainly comprises materials expressed by the composition formula X&agr;Ge&bgr;Mn&ggr;Sb&dgr;Te&egr; with each of the components respectively fulfills 0≦&agr;≦5, 1≦&bgr;≦5, 1≦&ggr;≦10, 65 ≦&dgr;<80, 15≦&egr;≦25, and &agr;≦&ggr; (where X expresses at least one of Ga and Sn, &agr;, &bgr;, &ggr;, &dgr;, and &egr; expresses atomic percentage, and fulfills &agr;+&bgr;+&ggr;+&dgr;+&egr;=100).