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:
Oct. 25, 2005
Filed:
Jul. 21, 2003
Eiko Hibino, Kanagawa, JP;
Hajime Yuzurihara, Kanagawa, JP;
Hiroshi Deguchi, Kanagawa, JP;
Hiroshi Miura, Kanagawa, JP;
Mikiko Abe, Kanagawa, JP;
Eiko Hibino, Kanagawa, JP;
Hajime Yuzurihara, Kanagawa, JP;
Hiroshi Deguchi, Kanagawa, JP;
Hiroshi Miura, Kanagawa, JP;
Mikiko Abe, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A phase change optical recording medium having a wide recording power margin and excellent durability to repetitive recording is disclosed. The medium includes a first protective layer, a recording layer, an interface layer, a second protective layer, and a reflective layer, the layers disposed on a transparent substrate, wherein the interface layer includes a mixture of ZrO. Preferably, the medium further includes a second interface layer including the mixture of ZrObetween the first protective layer and the recording layer. In another preferable aspect, the mixture of ZrOis represented by the following formula:[(ZrO)(X)](Z)(ZnS) wherein 'X' represents an oxide selected from MgO, CaO, ScO, YO, and CeO; 'Z' represents an oxide selected from TiO, SiO, AlO, MgO, TaO, and ZnO; “α” is 2-15 mol %; “β” is 40-100 mol %; “γ” is 0-60 mol %; “δ” is 0-60 mol %; and β+γ+δ=100 mol %.