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:
Aug. 09, 2005
Filed:
Feb. 19, 2003
Kotaro Kurokawa, Kanagawa, JP;
Takeshi Yamasaki, Kanagawa, JP;
Tomomi Yukumoto, Chiba, JP;
Masanobu Yamamoto, Kanagawa, JP;
Daisuke Ueda, Tokyo, JP;
Kotaro Kurokawa, Kanagawa, JP;
Takeshi Yamasaki, Kanagawa, JP;
Tomomi Yukumoto, Chiba, JP;
Masanobu Yamamoto, Kanagawa, JP;
Daisuke Ueda, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
An initialization method of an optical recording medium having a plurality of optical recording layers capable of reducing uneven initialization due to light interference caused at the time of initialization without deterioration of information recording/reproducing signal characteristics of the recording layers is provided. An initialization method of an optical recording medium, wherein a second optical recording layer and a first optical recording layer are successively stacked via an interlayer on a substrate, a protective layer is formed further on the first optical recording layer, a recording film in the first optical recording layer comprises a phase change type recording material, and a recording/reproducing light is irradiated from the protective film side at the time of recording/reproducing, a material composing the interlayer has a sufficient transmittance for a wavelength of the recording/reproducing light and absorption for an initializing light, and, in a step of initializing by irradiating an initializing light on the first optical recording layer from the protective film side, laser light having a wavelength range of 200 nm to 400 nm is used as the initializing light.