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:
Mar. 29, 2005
Filed:
Feb. 14, 2001
Yoshikazu Takagishi, Fujioka, JP;
Atsuo Shimizu, Osato-gun, JP;
Ryuichi Sunagawa, Takasaki, JP;
Keiichi Ida, Gunma-gun, JP;
Mitsuo Sekiguchi, Tano-gun, JP;
Isao Matsuda, Takasaki, JP;
Yoshikazu Takagishi, Fujioka, JP;
Atsuo Shimizu, Osato-gun, JP;
Ryuichi Sunagawa, Takasaki, JP;
Keiichi Ida, Gunma-gun, JP;
Mitsuo Sekiguchi, Tano-gun, JP;
Isao Matsuda, Takasaki, JP;
Taiyo Yuden Co., Ltd., Tokyo, JP;
Abstract
An optical information recording medium recordable at a high density two times or more higher than that of currently-used CD-Rs by optimally determining the thicknesses of a recording layer and a reflecting layer. The optical information recording medium comprises the recording layer formed on a transparent substrate having a spiral pregroove formed thereon, wherein a track pitch Tp of the pregroove is 1.0 μm≦Tp≦1.2 μm and a thickness Dg of the recording layer on the pregroove is 80 nm≦Dg≦120 nm.