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. 28, 2013
Filed:
Aug. 31, 2006
Hiroyoshi Sekiguchi, Yokohama, JP;
Michiaki Shinotsuka, Hiratsuka, JP;
Masaru Shinkai, Yokohama, JP;
Eiko Hibino, Yokohama, JP;
Hiroyoshi Sekiguchi, Yokohama, JP;
Michiaki Shinotsuka, Hiratsuka, JP;
Masaru Shinkai, Yokohama, JP;
Eiko Hibino, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A multilayer optical recording medium including at least multiple information layers each having at least a phase change recording layer capable of recording information by laser irradiation and a reflection layer, wherein each information layer other than the innermost information layer as seen from a side of the laser irradiation has at least a lower protection layer, the phase change recording layer, an upper protection layer, the reflection layer and an optical transmission layer, the upper protection layer and the optical transmission layer in each information layer other than the innermost information layer as seen from the side of the laser irradiation are composed of an Sn oxide-containing material and a thickness of the upper protection layer in each information layer other than the innermost information layer as seen from the side of the laser irradiation is 2 nm to 15 nm is provided.