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:
Dec. 27, 2011
Filed:
Aug. 30, 2007
Hiroyoshi Sekiguchi, Yokohama, JP;
Michiaki Shinotsuka, Hiratsuka, JP;
Masaru Shinkai, Yokohama, JP;
Masaki Kato, Machida, JP;
Hiroyoshi Sekiguchi, Yokohama, JP;
Michiaki Shinotsuka, Hiratsuka, JP;
Masaru Shinkai, Yokohama, JP;
Masaki Kato, Machida, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A multi-layered phase-change optical recording medium having a first substrate and a second substrate, and a plurality of information layers, wherein each of thermal diffusion layers of information layers other than an information layer disposed at the innermost side as viewed from the first substrate side has In oxide, Zn oxide, Sn oxide and Si oxide, and when the contents of thereof are represented by 'a', 'b', “c” and “d” [mol %] respectively, the following requirements are satisfied, and when the refractive index of the first and second substrates was represented by “n”, the laser light wavelength is represented by “λ” and the depth of the groove guide of the first and second substrates is represented by H, the H satisfied the following requirement,3≦a≦500≦d≦30=100λ/17≦λ/11.5