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. 26, 2008
Filed:
Dec. 07, 2004
Ikuo Matsumoto, Mito, JP;
Kenji Tokui, Hitachinaka, JP;
Kenichi Shimomai, Mito, JP;
Hiroshi Tabata, Mito, JP;
Kazuo Yonehara, Hitachinaka, JP;
Ikuo Matsumoto, Mito, JP;
Kenji Tokui, Hitachinaka, JP;
Kenichi Shimomai, Mito, JP;
Hiroshi Tabata, Mito, JP;
Kazuo Yonehara, Hitachinaka, JP;
Victor Company Of Japan, Ltd., Kanagawaken, JP;
Abstract
An optical disk consists of a first laminated layer structure and a second laminated layer structure. The first structure has a first transparent substrate having a first surface and a second surface on both sides thereof, provided on the first surface being a light-incident plane via which a light beam is to be incident in recording or reproduction, formed alternately on the second surface being a plurality of first lands and first grooves, and a first organic-dye recording layer formed on the second surface to cover the first lands and grooves. The second structure has a second substrate, alternately formed on which are a plurality of second lands and second grooves, a reflective film formed on the second transparent substrate to cover the second lands and grooves, and a second organic-dye recording layer formed on the reflective film to face the second transparent substrate. The first and the second structures are bonded to each other via a bonding layer so that the first and second recording layers are provided between the first and second substrates. A formula α≧cos(20/Tb) is satisfied in which Tb is a thickness of the reflective film formed on a bottom of each second groove and αis an angle between a plane passing through an upper surface of each second land and a side wall of each second groove.