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:
Feb. 02, 2010
Filed:
May. 26, 2003
Hiroaki Yamamoto, Kawabe-gun, JP;
Teruhiro Shiono, Osaka, JP;
Tatsuo Ito, Osaka, JP;
Seiji Nishino, Osaka, JP;
Sadao Mizuno, Ibaraki, JP;
Hiroaki Yamamoto, Kawabe-gun, JP;
Teruhiro Shiono, Osaka, JP;
Tatsuo Ito, Osaka, JP;
Seiji Nishino, Osaka, JP;
Sadao Mizuno, Ibaraki, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An optical recording medium which is a multilayer optical recording medium including a plurality of recording layers and records or reproduces information by the irradiation of light having a wavelength of λ0. At least one recording layer out of a plurality of recording layers includes a variable absorption film. The variable absorption film contains a material in which an electron energy has a band structure, and the absorption end of an absorption spectrum moves toward a longer wavelength side with a rise in temperature when light is absorbed by transition between electron bands, has a first absorptance to light having a wavelength of λ0 when a film temperature is a first temperature (application environment temperature), and has a second absorptance higher than the first absorptance to light having a wavelength of λ0 when a film temperature is a second temperature higher than the first temperature.