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. 02, 2008
Filed:
Jan. 06, 2005
Hiroki Yamamoto, Hitachi, JP;
Hideto Momose, Hitachiota, JP;
Yuuichi Sawai, Hitachi, JP;
Takashi Naito, Mito, JP;
Hiroki Yamamoto, Hitachi, JP;
Hideto Momose, Hitachiota, JP;
Yuuichi Sawai, Hitachi, JP;
Takashi Naito, Mito, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An optical information recording medium includes at least a reflecting layer, an optical information recording layer, a super-resolution layer and a protective layer. The super-resolution layer is a thin layer whose an optical constant changes nonlinearly due to a red shift of its band gap, and made of solid solution, compound or mixture of metal oxides containing two or more types of metal ions of the same valence. Ion radius unconformity ΔR=|(RM−RM)/RM| between ion radii RMand RMof two types of metal ions Mand Marbitrarily selected from the two or more types of metal ions is 8% or less. The difference ΔE=Eg−E between band gap energy Eg of the mixture of the metal oxides and energy E corresponding to a wavelength of the laser beam is a more 0.4 or less 1.4 eV.