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. 29, 2008
Filed:
Apr. 24, 2006
Kazunori Ito, Kanagawa, JP;
Eiko Hibino, Kanagawa, JP;
Makoto Harigaya, Kanagawa, JP;
Takashi Shibaguchi, Kanagawa, JP;
Hajime Yuzurihara, Kanagawa, JP;
Nobuaki Onagi, Kanagawa, JP;
Hiroko Ohkura, Kanagawa, JP;
Katsuhiko Tani, Tokyo, JP;
Noriyuki Iwata, Kanagawa, JP;
Kazunori Ito, Kanagawa, JP;
Eiko Hibino, Kanagawa, JP;
Makoto Harigaya, Kanagawa, JP;
Takashi Shibaguchi, Kanagawa, JP;
Hajime Yuzurihara, Kanagawa, JP;
Nobuaki Onagi, Kanagawa, JP;
Hiroko Ohkura, Kanagawa, JP;
Katsuhiko Tani, Tokyo, JP;
Noriyuki Iwata, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An optical recording medium including a recording layer which includes a reversible phase-change recording material, the recording layer being capable of writing information therein, reading written information therefrom, and rewriting written information by utilizing the reversible phase change of the phase-change recording material, wherein when a recording mark formed in the recording layer is repeatedly read 5000 times, using a continuous wave laser beam having such an intensity Pr that satisfies the condition of 1.1≦R≦2.0, in which R is σ/σas defined in the specification, the optical recording medium satisfies a relationship of d>das defined in the specification. The phase-change recording material, a method of producing the optical recording medium, and a method of writing information in the optical recording medium, reading written information therefrom and rewriting written information therein are proposed.